1. The formula of the refractory castable precast block for the furnace wall of the graphitization furnace is characterized in that: the formulation comprises the following raw materials:

three special-grade flint clay clinkers with different granularities, fused zirconia corundum, low-iron mullite fine powder, silicon micropowder, pure calcium aluminate cement, a water reducing agent, an explosion-proof agent, a defoaming agent and water;

a method for manufacturing a refractory castable precast block of a furnace wall of a graphitization furnace, which comprises the following steps:

s1, preparing materials, and processing the required raw materials into the required granularity;

s2, erecting a model of the castable precast block to be manufactured, assembling the model of the castable precast block to be manufactured, and fixing the model on a large vibration platform;

s3, mixing a fine powder raw material and a particle raw material, uniformly mixing three superfine flint clay clinkers with different granularities, fused zirconia corundum, low-iron mullite fine powder, silicon micropowder, pure calcium aluminate cement, a water reducing agent and an explosion-proof agent in proportion by primary stirring amount, burdening and stirring the particle raw material superfine flint clay clinkers and the fused zirconia corundum in proportion, adding a proper amount of water and an antifoaming agent, stirring for 1 minute, adding a premixed fine powder raw material, stirring for 3-5 minutes, and uniformly stirring all the raw materials;

s4, starting a vibration platform working mode, slowly and uniformly adding the stirred raw materials into a mould, circularly reciprocating until the pouring is finished, and finishing the pouring work after the upper plane of a pouring body is flattened and collected;

s5, baking the precast block, removing the mould after 12-24 hours of solidification, trimming the precast block, and naturally standing and maintaining;

and S6, after the precast block after baking heat treatment is tested to be qualified in elastic compression strength, the precast block is qualified as a qualified finished product without obvious cracks.

2. The formula of the refractory castable precast block for the furnace wall of the graphitization furnace as claimed in claim 1, wherein: the particle sizes of the three special-grade flint clay clinkers are respectively 20-10mm, 10-5mm and 5-3mm, the 20-10mm special-grade flint clay clinkers account for 8% -12% of the raw materials, the 10-5mm special-grade flint clay clinkers account for 23% -27% of the raw materials, and the 5-3mm special-grade flint clay clinkers account for 13% -17% of the raw materials.

3. The formula of the refractory castable precast block for the furnace wall of the graphitization furnace as claimed in claim 1, wherein: the granularity of the electro-fused zirconia corundum is 0-3mm, the granularity of the low-iron mullite fine powder is 0.074mm, the electro-fused zirconia corundum accounts for 18-22% of the raw materials, and the low-iron mullite fine powder accounts for 18.5-22.5% of the raw materials.

4. The formula of the refractory castable precast block for the furnace wall of the graphitization furnace as claimed in claim 1, wherein: the silicon micro powder accounts for 2.5-6.5% of the raw materials, the pure calcium aluminate cement accounts for 3-7% of the raw materials, the water reducing agent accounts for 0.1-0.3% of the raw materials, the explosion-proof agent accounts for 0.05-0.2% of the raw materials, and the defoaming agent accounts for 0.01% of the raw materials.

5. The formula of the refractory castable precast block for the furnace wall of the graphitization furnace as claimed in claim 1, wherein: the electric melting zirconia corundum is formed by crushing waste electric melting zirconia corundum bricks.

6. The method for manufacturing the refractory castable precast block for the furnace wall of the graphitization furnace as claimed in claim 1, wherein the method comprises the following steps: and (3) stirring and mixing the fine powder raw materials and the additives in the step S3 by using a double-cone mixing device, and stirring and mixing the particle raw materials by using a high-efficiency horizontal stirring device.

Background

The graphitizing furnace is mainly used for sintering and graphitizing carbon materials, graphitizing PI films, graphitizing heat conducting materials, sintering carbon fiber ropes, sintering and graphitizing carbon fiber filaments, purifying graphite powder and other materials capable of being graphitized in a carbon environment and the like, has the service temperature of 3000 ℃, high production efficiency, energy and electricity conservation, is provided with an online temperature measuring and controlling system, can monitor the temperature in the furnace in real time and automatically adjust the temperature.

The furnace wall of the graphitization furnace needs precast blocks poured by refractory materials, the existing refractory precast blocks have certain defects in raw material selection and the manufacturing method of the precast blocks, and further the manufactured refractory precast blocks have the defects of temperature resistance and the like, and the refractory precast blocks may crack and the like, so that the problems are solved by the formula and the manufacturing method of the refractory castable precast blocks of the graphitization furnace wall.

Disclosure of Invention

The invention aims to provide a formula and a manufacturing method of a refractory castable precast block of a furnace wall of a graphitization furnace, and aims to solve the problems that the existing refractory precast block proposed in the background technology has certain defects in raw material selection and a manufacturing method of the precast block, further causes the defects of temperature resistance and the like of the manufactured refractory precast block, and the refractory precast block is likely to generate cracks and the like.

In order to achieve the purpose, the invention provides the following technical scheme: the formula of the refractory castable precast block for the furnace wall of the graphitization furnace comprises the following raw materials:

three special-grade flint clay clinkers with different granularities, fused zirconia corundum, low-iron mullite fine powder, silicon micropowder, pure calcium aluminate cement, a water reducing agent, an explosion-proof agent, a defoaming agent and water;

a method for manufacturing a refractory castable precast block of a furnace wall of a graphitization furnace comprises the following steps:

s1, preparing materials, and processing the required raw materials into the required granularity;

s2, erecting a model of the castable precast block to be manufactured, assembling the model of the castable precast block to be manufactured, and fixing the model on a large vibration platform;

s3, mixing a fine powder raw material and a particle raw material, uniformly mixing three superfine flint clay clinkers with different granularities, fused zirconia corundum, low-iron mullite fine powder, silicon micropowder, pure calcium aluminate cement, a water reducing agent and an explosion-proof agent in proportion by primary stirring amount, burdening and stirring the particle raw material superfine flint clay clinkers and the fused zirconia corundum in proportion, adding a proper amount of water and an antifoaming agent, stirring for 1 minute, adding a premixed fine powder raw material, stirring for 3-5 minutes, and uniformly stirring all the raw materials;

s4, starting a vibration platform working mode, slowly and uniformly adding the stirred raw materials into a mould, circularly reciprocating until the pouring is finished, and finishing the pouring work after the upper plane of a pouring body is flattened and collected;

s5, baking the precast block, removing the mould after 12-24 hours of solidification, trimming the precast block, and naturally standing and maintaining;

and S6, after the precast block after baking heat treatment is tested to be qualified in elastic compression strength, the precast block is qualified as a qualified finished product without obvious cracks.

As a preferred technical scheme of the invention, the granularity of the three special-grade flint clay clinkers is 20-10mm, 10-5mm and 5-3mm respectively, the 20-10mm special-grade flint clay clinkers account for 8-12% of the raw materials, the 10-5mm special-grade flint clay clinkers account for 23-27% of the raw materials, and the 5-3mm special-grade flint clay clinkers account for 13-17% of the raw materials.

As a preferred technical scheme of the invention, the granularity of the fused zirconia corundum is 0-3mm, the granularity of the low-iron mullite fine powder is 0.074mm, the fused zirconia corundum accounts for 18-22% of the raw materials, and the low-iron mullite fine powder accounts for 18.5-22.5% of the raw materials.

As a preferred technical scheme of the invention, the silicon micropowder accounts for 2.5-6.5% of the raw materials, the pure calcium aluminate cement accounts for 3-7% of the raw materials, the water reducing agent accounts for 0.1-0.3% of the raw materials, the explosion-proof agent accounts for 0.05-0.2% of the raw materials, and the defoaming agent accounts for 0.01% of the raw materials.

As a preferred technical scheme of the invention, the electric melting zirconia corundum is formed by crushing waste electric melting zirconia corundum bricks.

In a preferred embodiment of the present invention, the fine powder raw material and the additive in step S3 are mixed by stirring using a double cone mixer, and the particulate raw material is mixed by stirring using a high efficiency horizontal mixer.

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

the invention selects three special-grade flint clay clinker with different granularities and fused zirconia corundum as particle raw materials, selects fine powder raw materials and additives formed by low-iron mullite fine powder, silicon micropowder, pure calcium aluminate cement, water reducing agent, explosion-proof agent and defoaming agent, fully mixes the raw materials, injects the mixture into a model, and prepares a precast block by vibration casting, and after a certain time of baking heat treatment, the elastic compression strength of the precast block can be effectively enhanced, and the special-grade flint clay clinker has extremely low impurity content, especially Na₂O+K₂The characteristics of extremely low O content, high refractoriness and wide sintering and melting range can be fully sintered with other raw materials, thereby effectively enhancing the elastic compression strength of the precast block and avoiding the rupture of the sintered block and the like.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.

The invention provides a formula of a refractory castable precast block for a furnace wall of a graphitization furnace and a technical scheme of a manufacturing method, wherein the formula comprises the following steps: the formulation comprises the following raw materials:

three special-grade flint clay clinkers with different granularities, electro-fused zirconia corundum, low-iron mullite fine powder, silicon micropowder, pure calcium aluminate cement, a water reducing agent, an explosion-proof agent, a defoaming agent and water are selected, the special-grade flint clay clinkers with different granularities can utilize the impurity content in the special-grade flint clay clinkers, particularly the Na2O + K2O content is extremely low, the refractoriness is higher, and the sintering melting range is wider, the special-grade flint clay clinkers can be fully sintered with other raw materials, so that the elastic pressure strength of a prefabricated block is effectively enhanced, the breakage and the like of the sintered block can be avoided, the low-iron fine powder is prepared into mullite series sand and prefabricated powder with high aluminum content, low iron content, high hardness, small thermal expansion coefficient, high refractoriness, stable thermochemical performance and the like through the machining processes of high-temperature roasting, crushing, sieving, thunder, iron removal and the like, and the high-temperature resistance degree of the block can be effectively improved, the silicon micropowder has high refractoriness, the prepared precast block has excellent high-temperature performance due to the pure calcium aluminate cement, is suitable for high-temperature environments, has the advantages of low impurities, high bonding strength, stable setting time and the like, is suitable for being prepared for high-temperature parts, and the water reducing agent added into the raw materials of the precast block can disperse raw material particles, improve the working performance, reduce the unit water consumption and improve the fluidity of concrete mixtures;

a method for manufacturing a refractory castable precast block of a furnace wall of a graphitization furnace comprises the following steps:

s1, preparing materials, and processing the required raw materials into the required granularity;

s2, erecting a model of the castable precast block to be manufactured, assembling the model of the castable precast block to be manufactured, and fixing the model on a large vibration platform;

s3, mixing a fine powder raw material and a particle raw material, uniformly mixing three superfine flint clay clinkers with different granularities, fused zirconia corundum, low-iron mullite fine powder, silicon micropowder, pure calcium aluminate cement, a water reducing agent and an explosion-proof agent in proportion by primary stirring amount, burdening and stirring the particle raw material superfine flint clay clinkers and the fused zirconia corundum in proportion, adding a proper amount of water and an antifoaming agent, stirring for 1 minute, adding a premixed fine powder raw material, stirring for 3-5 minutes, and uniformly stirring all the raw materials;

s4, starting a vibration platform working mode, slowly and uniformly adding the stirred raw materials into a mould, circularly reciprocating until the pouring is finished, and finishing the pouring work after the upper plane of a pouring body is flattened and collected;

s5, baking the precast block, removing the mould after 12-24 hours of solidification, trimming the precast block, and naturally standing and maintaining;

and S6, after the precast block after baking heat treatment is tested to be qualified in elastic compression strength, the precast block is qualified as a qualified finished product without obvious cracks.

The particle sizes of the three special-grade flint clay clinkers are respectively 20-10mm, 10-5mm and 5-3mm, the 20-10mm special-grade flint clay clinkers account for 8% -12% of the raw materials, the 10-5mm special-grade flint clay clinkers account for 23% -27% of the raw materials, and the 5-3mm special-grade flint clay clinkers account for 13% -17% of the raw materials.

The granularity of the fused zirconia corundum is 0-3mm, the granularity of the low-iron mullite fine powder is 0.074mm, the fused zirconia corundum accounts for 18-22% of the raw materials, and the low-iron mullite fine powder accounts for 18.5-22.5% of the raw materials.

The silicon micro powder accounts for 2.5-6.5% of the raw materials, the pure calcium aluminate cement accounts for 3-7% of the raw materials, the water reducing agent accounts for 0.1-0.3% of the raw materials, the explosion-proof agent accounts for 0.05-0.2% of the raw materials, and the defoaming agent accounts for 0.01% of the raw materials.

The fused zirconia corundum is formed by crushing waste fused zirconia corundum bricks.

And (8) stirring and mixing the fine powder raw materials and the additives in the step (S3) by using a double-cone mixing device, and stirring and mixing the particle raw materials by using a high-efficiency horizontal stirring device.

In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.