1. The preparation method of the coagulant for gypsum board production is characterized by comprising the following steps:

step 100, preprocessing the gypsum board saw edge waste to screen out waste protective paper and overfire saw edge waste in the gypsum board saw edge waste to obtain a gypsum dry board;

200, grinding the gypsum dry board under preset conditions to obtain gypsum fine powder;

step 300, uniformly coating a slow release layer outside the gypsum fine powder particles to obtain the modified gypsum fine powder.

2. The method of claim 1, wherein in step 200, the preset conditions include a grinding device, a powder mode and a grinding temperature;

wherein, the grinding equipment is a ball mill with a grinding body of 810 kg;

the grinding mode is grinding by adding a grinding aid;

the grinding temperature is 40-50 ℃.

3. The method of claim 2, wherein the ratio of the dry gypsum board to the grinding aid is 3: 1 and the grinding aid is at least one of glucose, maltodextrin or starch.

4. The method of claim 3, wherein the pre-treatment step 100 comprises:

step 101, crushing the gypsum board saw edge waste by using a jaw crusher to obtain crushed gypsum board particles;

and 102, removing the waste protective paper in the crushed gypsum boards and the end edge sawing waste adhered to the waste protective paper by using a removing mechanism to obtain the dry gypsum boards.

5. The method of claim 4, wherein the removing means comprises:

the gypsum board transmission unit (10) is arranged below a discharge port of the jaw crusher, and the gypsum board transmission unit (10) is used for collecting gypsum boards coarsely crushed by the jaw crusher and conveying the gypsum boards to the next working section;

the fine crushing unit (20) is arranged above the gypsum board conveying unit (10), and the fine crushing unit (20) is used for secondarily crushing gypsum boards on the gypsum board conveying unit (10) in the up-and-down reciprocating motion;

the paper scrap separating unit (30) is arranged on the fine crushing unit (20), and the paper scrap separating unit (30) is used for continuously removing the waste protective paper on the gypsum board conveying unit (10) in the reciprocating motion of the fine crushing unit (20).

6. The method for preparing the accelerator according to claim 5, wherein the fine crushing unit (20) comprises a breaking hammer (21) for knocking and crushing the gypsum board and a power member for driving the breaking hammer (21) to reciprocate up and down, a coaming (22) for forming a crushing area is arranged around the crushing surface of the breaking hammer (21), and the coaming (22) is slidably mounted around the breaking hammer (21) for height adjustment according to the distance between the breaking hammer (21) and the gypsum board conveying unit.

7. The method for preparing the accelerator according to claim 6, wherein the paper dust separation unit (30) comprises a plurality of channels running through the breaking hammer (21) in the longitudinal direction, a blowing pipe (31) is arranged in the channels, an air pump connected with the blowing pipes (31) is arranged above the breaking hammer (31), blanking holes (11) corresponding to the blowing pipes (31) in a one-to-one manner are arranged on the conveying surface of the gypsum board conveying unit (10), the lower part of the gypsum board conveying unit (10) forms a collecting area of the gypsum powder, and the tail end of the gypsum board conveying unit (10) forms a collecting area of the gypsum board mask paper.

8. The method of claim 7, wherein the breaking hammer (21) comprises a first block (211) and a second block (212) disposed below the first block (211), the first block (211) and the second block (212) being connected by a spring (213);

the passageway including set up in first passageway in first hammer block (211) and set up in second passageway in second hammer block (212), blow the upper end fixed mounting of material pipe (31) in the first passageway, blow the lower extreme movable mounting of material pipe (31) in the second passageway blow the gas blow department of material pipe (31) and be provided with check valve (32) the end of first passageway is provided with switches on piece (33) so that second hammer block (212) contacts the back with the gypsum board switch on piece (33) switch on check valve (32) carry out the operation of blowing.

9. The method for preparing the setting accelerator for gypsum board production according to claim 2, wherein the grinding of the gypsum powder and the grinding aid specifically comprises:

step 201, adding a gypsum board and a grinding aid into a ball mill, and grinding the gypsum board by controlling the temperature of a grinding material to be 40-50 ℃ by water cooling to obtain a mixed material of gypsum powder and the grinding aid;

202, screening the mixed material by wind power by using winnowing equipment so as to separate large-particle raw gypsum powder which is not completely ground, raw gypsum fine powder coated with grinding aid and grinding aid which is not coated on the surface of the raw gypsum powder;

step 203, conveying the screened large-particle gypsum powder and grinding aid back to the ball grinding agent again for continuous grinding, and collecting the gypsum fine powder coated with the grinding aid to the next working section for later use;

step 204, repeating step 202 and step 203 until no large-particle gypsum powder exists.

10. The method for preparing the coagulant used for gypsum board production according to claim 9, wherein in step 300, the slow release layer is a grinding aid coated outside the raw gypsum fine powder, and the step of uniformly adhering the grinding aid to the outside of the raw gypsum fine powder particles specifically comprises the steps of:

step 301, subjecting the gypsum fine powder coated with the grinding aid collected in step 203 to air flow impact to enable the grinding aid to fall off from the surface of the gypsum fine powder so as to obtain the gypsum fine powder in a dispersed and non-sticky state and the grinding aid;

and 302, mixing and stirring the grinding aid and the gypsum fine powder to enable the grinding aid to be secondarily attached to the surface of the gypsum fine powder.

Background

The paper-surface gypsum board is a light building board prepared in a production line by taking gypsum as a base material, mixing additives such as a binder, a foaming agent and the like as core materials and taking two layers of paper boards as protective paper. The gypsum plaster board is produced by taking desulfurized waste residue of a thermal power plant, namely desulfurized gypsum, as a main raw material, belongs to comprehensive utilization of resources, and has the advantages of energy conservation, environmental protection, convenience in construction and the like.

The coagulant used in gypsum board production is generally prepared by grinding raw gypsum powder, provides crystal nuclei for hydrated plaster, promotes the growth of gypsum crystals, and thus improves the strength of a hydrated and hardened gypsum body. In the production of ultra-light boards, the efficiency of the accelerator is of paramount importance, and ineffective accelerators can be seen as impurities, affecting the consistency of the slurry, the hydration properties and the strength of the gypsum body. The efficiency of the coagulant is mainly determined by the indexes of gypsum (dihydrate gypsum), specific surface area, water content and the like.

The waste collected when the gypsum board is sawn into edges is used for preparing the coagulant in a common production line, however, the sawn edges of the gypsum board generally have the problem of overburning, the crystal water content of the sawn edge waste is reduced, the content of dihydrate gypsum is reduced, and the efficiency of the prepared coagulant is reduced; in addition, the saw edge waste contains a lot of paper scraps, which greatly affect the fluidity of the slurry, thereby further affecting the ball milling effect and the stability of the coagulant.

Disclosure of Invention

The invention aims to provide a preparation method of a gypsum board production coagulant, which aims to solve the technical problem that the gypsum board coagulant in the prior art cannot meet the production requirement.

In order to solve the technical problems, the invention specifically provides the following technical scheme:

a method for preparing a coagulant for gypsum board production comprises the following steps:

step 100, preprocessing the gypsum board saw edge waste to screen out waste protective paper and overfire saw edge waste in the gypsum board saw edge waste to obtain a gypsum dry board;

200, grinding the gypsum dry board under preset conditions to obtain gypsum fine powder;

step 300, uniformly coating a slow release layer outside the gypsum fine powder particles to obtain the modified gypsum fine powder.

As a preferable scheme of the present invention, in step 200, the preset conditions include a grinding device, a powder mode, and a grinding temperature;

wherein, the grinding equipment is a ball mill with a grinding body of 810 kg;

the grinding mode is grinding by adding a grinding aid;

the grinding temperature is 40-50 ℃.

As a preferable scheme of the invention, the ratio of the gypsum dry board to the grinding aid is 3: 1 and the grinding aid is at least one of glucose, maltodextrin or starch.

As a preferred aspect of the present invention, in step 100, the pretreatment comprises:

step 101, crushing the gypsum board saw edge waste by using a jaw crusher to obtain crushed gypsum board particles;

and 102, removing the waste protective paper in the crushed gypsum boards and the end edge sawing waste adhered to the waste protective paper by using a removing mechanism to obtain the dry gypsum boards.

As a preferable aspect of the present invention, the rejecting mechanism includes:

the gypsum board transmission unit is arranged below a discharge port of the jaw crusher and is used for collecting gypsum boards coarsely crushed by the jaw crusher and conveying the gypsum boards to the next working section;

the fine crushing unit is arranged above the gypsum board conveying unit and is used for secondarily crushing the gypsum boards on the gypsum board conveying unit in the vertical reciprocating motion;

and the paper scrap separation unit is arranged on the fine crushing unit and is used for continuously removing the waste protective paper on the gypsum board transmission unit in the reciprocating motion of the fine crushing unit.

As a preferable mode of the present invention, the fine crushing unit includes a breaking hammer for performing striking crushing on the gypsum board and a power member for driving the breaking hammer to perform an up-and-down reciprocating motion, a surrounding plate for forming a crushing area is provided around a crushing surface of the breaking hammer, and the surrounding plate is slidably mounted around the breaking hammer to perform height adjustment according to a distance between the breaking hammer and the gypsum board conveying unit.

As a preferable scheme of the present invention, the paper dust separation unit includes a plurality of passages that are provided to penetrate through the breaking hammer in a longitudinal direction, a blowing pipe is provided in each passage, an air pump that is commonly connected to the plurality of blowing pipes is provided above the breaking hammer, blanking holes that correspond to the blowing pipes one by one are provided on a transmission surface of the gypsum board transmission unit, a collection area for the gypsum powder is formed below the gypsum board transmission unit, and a collection area for the gypsum board cover paper is formed at a tail end of the gypsum board transmission unit.

As a preferable scheme of the present invention, the breaking hammer includes a first hammer block and a second hammer block disposed below the first hammer block, and the first hammer block and the second hammer block are connected by a spring;

the passageway including set up in first passageway in the first hammer block and set up in second passageway in the second hammer block, blow the upper end fixed mounting of material pipe in the first passageway, blow the lower extreme movable mounting of material pipe in the second passageway blow the gas blow mouthful department of material pipe and be provided with the check valve the end of first passageway is provided with and switches on the piece so that after second hammer block and gypsum board contact the piece switches on the check valve carries out the operation of blowing.

As a preferred scheme of the invention, the grinding of the gypsum powder and the grinding aid specifically comprises the following steps:

step 201, adding a gypsum board and a grinding aid into a ball mill, and grinding the gypsum board by controlling the temperature of a grinding material to be 40-50 ℃ by water cooling to obtain a mixed material of gypsum powder and the grinding aid;

202, screening the mixed material by wind power by using winnowing equipment so as to separate large-particle raw gypsum powder which is not completely ground, raw gypsum fine powder coated with grinding aid and grinding aid which is not coated on the surface of the raw gypsum powder;

step 203, conveying the screened large-particle gypsum powder and grinding aid back to the ball grinding agent again for continuous grinding, and collecting the gypsum fine powder coated with the grinding aid to the next working section for later use;

step 204, repeating step 202 and step 203 until no large-particle gypsum powder exists.

As a preferable scheme of the present invention, in step 300, the slow release layer is a grinding aid coated outside the gypsum fine powder, and uniformly adhering the grinding aid to the outside of the gypsum fine powder particles specifically includes:

step 301, subjecting the gypsum fine powder coated with the grinding aid collected in step 203 to air flow impact to enable the grinding aid to fall off from the surface of the gypsum fine powder so as to obtain the gypsum fine powder in a dispersed and non-sticky state and the grinding aid;

and 302, mixing and stirring the grinding aid and the gypsum fine powder to enable the grinding aid to be secondarily attached to the surface of the gypsum fine powder.

Compared with the prior art, the invention has the following beneficial effects:

(1) in the invention, gypsum board saw edge waste is used as a raw material for preparing the coagulant, waste mask paper and end saw edge waste which influence the effect of the coagulant are removed, in the process of hydrating the building gypsum, ground gypsum powder can be used as crystal nuclei to promote the growth of the crystals in the length direction, and the gypsum crystals grow to the periphery by taking the crystal nuclei as centers and are interwoven together to form a compact network structure so as to generate strength;

(2) according to the embodiment of the invention, the slow release layer is uniformly coated outside the gypsum fine powder particles, so that the gypsum powder can be prevented from agglomerating, and meanwhile, the coagulant has a slow release performance in the hydration process, so that the gypsum slurry is not too fast to hydrate at the initial stage, and sufficient time is provided for stirring and forming.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

FIG. 1 is a flow chart illustrating the preparation of an accelerator according to an embodiment of the invention;

fig. 2 is a schematic structural diagram of a removing mechanism according to an embodiment of the present invention.

The reference numerals in the drawings denote the following, respectively:

10-a gypsum board transfer unit; 20-a finely divided unit; 30-a paper scrap separation unit;

11-blanking holes;

21-breaking hammer;

31-blowing the material pipe; 32-a one-way valve; 33-conducting block;

211 — first ram block; 212-a second hammer block; 213-spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in FIG. 1, the invention provides a method for preparing a setting accelerator for gypsum board production, comprising the following steps:

step 100, preprocessing the gypsum board saw edge waste to screen out waste protective paper and overfire saw edge waste in the gypsum board saw edge waste to obtain a gypsum dry board;

200, grinding the gypsum dry board under preset conditions to obtain gypsum fine powder;

step 300, uniformly coating a slow release layer outside the gypsum fine powder particles to obtain the modified gypsum fine powder.

Based on the existing steps of the preparation of the coagulant, one of the characteristics of the embodiment of the invention is that the waste protective paper and the over-burnt sawn edge waste in the sawn edge waste of the gypsum board are screened out by pretreatment, so that the influence caused by the over-burning of the waste paper scraps and the end sawn edge waste is avoided.

Specifically, the pretreatment comprises:

firstly, crushing the gypsum board saw edge waste by using a jaw crusher to obtain crushed gypsum board crushed materials, performing coarse crushing work on the gypsum board saw edge waste by using the jaw crusher, and crushing larger gypsum board saw edge waste into small blocks;

the gypsum board drying process is characterized in that the water content of the gypsum part bonded with the facing paper is lower than that of the interior of the gypsum board, and the problem of overburning exists, so that the waste facing paper in the crushed gypsum board and the overburning saw edge waste adhered with the waste facing paper are removed by the removing mechanism, and the gypsum dry board can be obtained.

Further, as shown in fig. 2, the rejecting mechanism includes:

the gypsum board transmission unit 10 is arranged below a discharge port of the jaw crusher, and the gypsum board transmission unit 10 is used for collecting gypsum boards coarsely crushed by the jaw crusher and conveying the gypsum boards to the next working section;

a fine crushing unit 20 disposed above the gypsum board conveying unit 10, wherein the fine crushing unit 20 is used for secondarily crushing the gypsum boards on the gypsum board conveying unit 10 in the up-and-down reciprocating motion;

and the paper scrap separating unit 30 is arranged on the fine crushing unit 20, and the paper scrap separating unit 30 is used for continuously removing the waste protective paper on the gypsum board conveying unit 10 in the reciprocating motion of the fine crushing unit 20.

Above-mentioned broken bits unit can make the gypsum board fragment strike for the gypsum powder at the reciprocal crushing in-process from top to bottom, but the mask paper is difficult broken, at the in-process that screens the mask paper, can utilize the less characteristics of mask paper proportion to carry out the selection by winnowing, but the selection by winnowing operation is not big to the mask paper effect that bonds to have the saw limit waste material of overburning, the saw limit waste material of overburning can increase the quality of mask paper and cause difficult selection by winnowing, and the mode of traditional mesh screen selection is unfavorable for the mask paper of schist piece again.

In view of the above, in the embodiment of the present invention, the fine crushing unit 20 includes a breaking hammer 21 for performing striking crushing on the gypsum board and a power member for driving the breaking hammer 21 to perform up-and-down reciprocating motion, a surrounding plate 22 for forming a crushing region is provided around a crushing surface of the breaking hammer 21, and the surrounding plate 22 is slidably mounted around the breaking hammer 21 to perform height adjustment according to a distance between the breaking hammer 21 and the gypsum board conveying unit.

The paper scrap separating unit 30 comprises a plurality of channels which are arranged along the longitudinal direction of the breaking hammer 21 in a penetrating mode, a blowing pipe 31 is arranged in each channel, an air pump which is connected with the blowing pipe 31 in a common mode is arranged above the breaking hammer 31, blanking holes 11 which correspond to the blowing pipes 31 in a one-to-one mode are formed in the transmission surface of the gypsum board transmission unit 10, a gypsum powder collecting area is formed below the gypsum board transmission unit 10, and the tail end of the gypsum board transmission unit 10 forms a gypsum board mask paper collecting area.

When the gypsum board knocked below the breaking hammer 21 is a gypsum board with a facing paper, the facing paper is separated between the upper material blowing pipe 31 and the blanking hole 11, the material blowing pipe 31 and the blanking hole 11 cannot be communicated, the knocked gypsum board powder is gathered into blocks and cannot fall down along the blanking hole 11, the blocks and the gypsum board facing paper are transmitted to the collection area of the gypsum board facing paper at the tail end along with the gypsum board transmission unit 10, and the gypsum board which is not bonded with the facing paper is directly crushed and then blown through the material blowing pipe 31 and falls down along the blanking hole 11.

In addition, in order to avoid the dust flying in the whole working area caused by the normally open material blowing pipe 31, the opening and closing of the material blowing pipe 31 are specially designed, specifically,

the breaking hammer 21 comprises a first hammer block 211 and a second hammer block 212 arranged below the first hammer block 211, and the first hammer block 211 and the second hammer block 212 are connected through a spring 213;

the channel comprises a first channel arranged in the first hammer block 211 and a second channel arranged in the second hammer block 212, the upper end of the blowing pipe 31 is fixedly arranged in the first channel, the lower end of the blowing pipe 31 is movably arranged in the second channel, a one-way valve 32 is arranged at a blowing port of the blowing pipe 31, a conducting block 33 is arranged at the tail end of the first channel so that the conducting block 33 conducts the one-way valve 32 to perform blowing operation after the second hammer block 212 contacts with a gypsum board, namely, after the second hammer block contacts with the gypsum board, the first hammer block continues to be pressed downwards to compress a spring, a gap between the blowing pipe and the conducting block is reduced until the conducting block conducts the one-way valve to start blowing operation, after the breaking hammer finishes pressing, the spring recovers deformation, the conducting block withdraws from the one-way valve, and the blowing pipe stops operating.

The conduction principle of the one-way valve and the conduction block can utilize any structure which can realize the one-way conduction function in the prior art, such as a structure adopting a basketball air vent.

In addition, the dry board generally contains 0.2-0.5% of water, which causes the problem that the coagulation accelerator is agglomerated during the grinding process, and has a large influence on the coagulation accelerating effect. Through repeated tests, the grinding aid can play a role in grinding and dispersing by adding a proper amount of starch, and the ratio of the starch to the gypsum is 1: and 3, the starch is coated outside the coagulant particles, so that the protective and slow-release effects can be achieved, the coagulant cannot counteract the effect of the retarder in the stirrer, and the fluidity of the slurry is not affected.

The starch may also be replaced by glucose or maltodextrin;

in the grinding process of the coagulant, the weight of the grinding body of the ball mill is very critical, and the weight of the grinding body is determined to be 810kg through repeated tests, so that the grinding effect is good, and the conveying efficiency is high.

The ball mill can generate heat in the running process, the temperature of the coagulant is controlled to be about 45 ℃ through water cooling, on one hand, moisture contained in the materials can be evaporated, on the other hand, crystallization water cannot be removed from the gypsum, and on the other hand, the air outlet is formed in the mill, so that moisture contained in the coagulant can be discharged.

Since the key of the coagulant is the control of the fineness of the coagulant, the finer the coagulant is, the higher the reactivity is, in order to improve the grinding effect of the raw gypsum powder, in the embodiment of the invention, the grinding of the raw gypsum powder and the grinding aid specifically comprises the following steps:

step 201, adding a gypsum board and a grinding aid into a ball mill, and grinding the gypsum board by controlling the temperature of a grinding material to be 40-50 ℃ by water cooling to obtain a mixed material of gypsum powder and the grinding aid;

202, screening the mixed material by wind power by using winnowing equipment so as to separate large-particle raw gypsum powder which is not completely ground, raw gypsum fine powder coated with grinding aid and grinding aid which is not coated on the surface of the raw gypsum powder;

step 203, conveying the screened large-particle gypsum powder and grinding aid back to the ball grinding agent again for continuous grinding, and collecting the gypsum fine powder coated with the grinding aid to the next working section for later use;

step 204, repeating step 202 and step 203 until no large-particle gypsum powder exists.

In the process, the fineness of the gypsum fine powder can be improved by repeatedly grinding for many times, and the fineness of the gypsum fine powder is kept uniform and consistent.

In step 202, the mixture in the ball mill includes large-particle raw gypsum powder which is not completely ground, raw gypsum fine powder coated with a grinding aid, and a grinding aid which is not coated on the surface of the raw gypsum powder, and since the particle size difference of the three is not large, the three are not easily distinguished by adopting a traditional screening method, in the embodiment of the present invention, the wind screening is adopted, which specifically includes:

step 2021, dropping the mixed material ground by the ball mill in the step 201 from a high position in a vertical manner;

2022, performing horizontal blowing operation on one side of the mixed material to apply horizontal acting force on the falling mixture;

the blowing work herein employs hot air to further reduce the water content in the raw gypsum fine powder.

2023, enabling the components in the mixed material to fall in a parabolic manner and to present different displacements in the horizontal direction according to the weight;

the grinding aid in the mixed material has two existing forms, one is a single existing form, and the other is adhered to the raw gypsum fine powder or the large-particle raw gypsum powder, wherein the adsorption force between the grinding aid and the large-particle raw gypsum fine powder is small, the wind power is controlled in the wind power screening process, the grinding aid can be separated from the surface of the large particles, and the adsorption force between the grinding aid adsorbed on the gypsum fine powder and the gypsum fine powder is large, and the grinding aid is continuously adsorbed on the surface of the gypsum fine powder.

Thus, the largest horizontal displacement is the grinding aid with the smallest mass, and the smallest horizontal displacement is the large, incompletely ground particle gypsum powder with the largest mass.

In step 300, the slow release layer is a grinding aid coated outside the gypsum fine powder, and the step of uniformly adhering the grinding aid to the outside of the gypsum fine powder particles specifically comprises the following steps:

step 301, subjecting the gypsum fine powder coated with the grinding aid collected in step 203 to air flow impact to enable the grinding aid to fall off from the surface of the gypsum fine powder so as to obtain the gypsum fine powder in a dispersed and non-sticky state and the grinding aid;

and 302, mixing and stirring the grinding aid and the gypsum fine powder to enable the grinding aid to be secondarily attached to the surface of the gypsum fine powder.

The mode of firstly separating the grinding aid from the gypsum fine powder and then secondarily attaching the grinding aid is based on the fact that in the grinding process, uneven attachment sites may exist in the adsorption of the grinding aid on the gypsum fine powder, so that the situation that the amounts of the grinding aid attached to different gypsum fine powders are inconsistent is caused, and further the hydration speed of the coagulant is inconsistent, and the quality of gypsum forming is influenced.

Thus, in step 301, obtaining dispersed non-agglomerated grinding aid and gypsum fines specifically comprises:

3011, placing the gypsum fine powder and the grinding aid into a sealed cavity;

3012, forming a 360-degree rotating and stirring air flow at the bottom of the gypsum fine powder and the grinding aid to enable the grinding aid to be stripped from the outside of the gypsum fine powder under the impact of the air flow;

the strong air blast shock wave can disperse the grinding aid and the gypsum fine powder and further improve the fineness of the gypsum fine powder.

And 3013, stopping stirring with the air flow, and collecting the fallen gypsum fine powder and the grinding aid.

Therefore, the slow release layer is uniformly coated outside the fine gypsum powder particles, the gypsum powder can be prevented from agglomerating, the slow release performance of the coagulant can be realized in the hydration process, the gypsum slurry is not too fast to hydrate in the initial stage, and sufficient time is provided for stirring and forming.

The coagulant prepared by the scheme has the specific surface area of 10000-15000cm2/g, the moisture content of below 0.3 percent, no agglomeration phenomenon, greatly improved coagulation accelerating efficiency and greatly reduced consumption, can be used for producing ultra-light boards, and can be used for improving the strength and the hardness of the core of the ultra-light board.

The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.