1. A pelletizing method of solid hazardous waste materials by a steel dust-mud rotary hearth furnace method is characterized by comprising the following steps: the method comprises the following steps:

the material flattening device is additionally arranged between the belt head wheel and the balling disc, the installation of the material distributor meets the basic principle that the original blanking point position of the material is not changed, the material passes through the material flattening device when falling down and then falls on the balling disc through the addition of the material flattening device, and under the condition that the original blanking point position of the material is not changed, the material distribution is changed into planar material from point-mounted material distribution, so that the uniform material distribution is realized, and the improvement of the number of the cue balls is facilitated;

the water supply is changed in the gradient mode by adopting six-level fan-shaped levels, the water supply amount is changed in the gradient mode, the mixed pelletizing of the dedusting ash and the sludge is different from the pelletizing of the iron fine powder, the dedusting ash and the sludge are fine in granularity and strong in water absorption and are easy to agglomerate, so that the formed quantity of the cue balls is small, the cue balls in the pelletizing disc are easy to grow up, the ball diameter is difficult to control, the water supply is changed in the gradient mode by realizing the six-level fan-shaped levels, the number of the cue balls in the pelletizing disc is effectively increased, the growing of the green balls is facilitated, and the ball diameter is easy to control.

Background

Along with the rapid development of the metallurgical industry in China, various metallurgical solid hazardous waste materials are generated, and if the solid hazardous waste materials cannot be effectively utilized, the resource loss of steel enterprises is caused, and the social environment load is increased more seriously. As a main treatment object of the heavy pollution industry, the environmental protection problem of the iron and steel production enterprise becomes a main problem of realizing sustainable development of the enterprise, and whether solid wastes generated by the iron and steel enterprise can be effectively treated or not is a red line for determining whether the enterprise lives or not.

The rotary hearth furnace solid hazardous waste material production line has high requirements on the quality of green pellets due to process requirements, particularly, the falling strength index of the green pellets is 15-20 times/1 m, the proportion of the particle size of 6.3-16 mm accounts for more than 88%, most rotary hearth furnace pelletizing processes of steel mills use a phi 7000mm nonstandard disc pelletizer, the physical characteristics of sludge and dust are not favorable for pelletizing, the disc pelletizer body has roundness and levelness errors, the pelletizing disc production parameters are unreasonable and other factors, the hourly pelletizing quantity fluctuation is large, and the falling strength and the particle size control of the green pellets are also lower than the process requirement values.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a pelletizing method of solid hazardous waste materials by a rotary hearth furnace method of steel dust and sludge, which solves the problems that the production line of the solid hazardous waste materials of the rotary hearth furnace has higher requirements on the quality of green pellets due to the process requirements, particularly, the falling strength index of the green pellets is 15-20 times/1 m, the proportion of the granularity of 6.3-16 mm accounts for more than 88%, most rotary hearth furnace pelletizing processes of steel plants use a phi 7000mm non-standard disc pelletizer, and the physical characteristics of sludge and dedusting ash are not beneficial to pelletizing, the disc pelletizer body has roundness and levelness errors, the production parameters of the pelletizing disc are unreasonable and other factors, the fluctuation of the hourly pelletizing quantity is larger, and the falling strength and the granularity control of the green pellets are also lower than the process requirements.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a pelletizing method for solid hazardous waste materials by a steel dust-mud rotary hearth furnace method comprises the following steps:

the material flattening device is additionally arranged between the belt head wheel and the balling disc, the installation of the material distributor meets the basic principle that the original blanking point position of the material is not changed, the material passes through the material flattening device when falling down and then falls on the balling disc through the addition of the material flattening device, and under the condition that the original blanking point position of the material is not changed, the material distribution is changed into planar material from point-mounted material distribution, so that the uniform material distribution is realized, and the improvement of the number of the cue balls is facilitated;

the water supply is changed in the gradient mode by adopting six-level fan-shaped levels, the water supply amount is changed in the gradient mode, the mixed pelletizing of the dedusting ash and the sludge is different from the pelletizing of the iron fine powder, the dedusting ash and the sludge are fine in granularity and strong in water absorption and are easy to agglomerate, so that the formed quantity of the cue balls is small, the cue balls in the pelletizing disc are easy to grow up, the ball diameter is difficult to control, the water supply is changed in the gradient mode by realizing the six-level fan-shaped levels, the number of the cue balls in the pelletizing disc is effectively increased, the growing of the green balls is facilitated, and the ball diameter is easy to control.

(III) advantageous effects

The invention provides a pelletizing method of solid hazardous waste materials by a steel dust-mud rotary hearth furnace method. The method has the following beneficial effects: according to the pelletizing method of the solid hazardous waste materials by the steel dust mud rotary hearth furnace method, the material flattening device is additionally arranged, uniform material distribution and stable pelletizing are achieved, meanwhile, water is supplied by six-level fan-shaped levels, the water supply quantity is changed in a gradient mode, various quality indexes of green pellets are improved, particularly, the particle size of the green pellets is well controlled, the proportion of 6.3-16 mm reaches more than 95%, the flow fluctuation of the green pellets is reduced to be within +/-2 t, and guarantee is provided for stabilizing the roasting atmosphere of the rotary hearth furnace and improving the dezincification rate.

Drawings

FIG. 1 is a diagram illustrating the quality index of green pellets and the fluctuation amount of hourly pelletizing quantity in the prior art;

FIG. 2 is a schematic diagram of the improved quality index of green pellets and the fluctuation of hourly pelletizing quantity in the present invention.

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.

Referring to fig. 1-2, the present invention provides a technical solution: a pelletizing method for solid hazardous waste materials by a steel dust-mud rotary hearth furnace method comprises the following steps:

the material flattening device is additionally arranged between the belt head wheel and the balling disc, the installation of the material distributor meets the basic principle that the original blanking point position of the material is not changed, the material passes through the material flattening device when falling down and then falls on the balling disc through the addition of the material flattening device, and under the condition that the original blanking point position of the material is not changed, the material distribution is changed into planar material from point-mounted material distribution, so that the uniform material distribution is realized, and the improvement of the number of the cue balls is facilitated;

the water supply is changed in the gradient mode by adopting six-level fan-shaped levels, the water supply amount is changed in the gradient mode, the mixed pelletizing of the dedusting ash and the sludge is different from the pelletizing of the iron fine powder, the dedusting ash and the sludge are fine in granularity and strong in water absorption and are easy to agglomerate, so that the formed quantity of the cue balls is small, the cue balls in the pelletizing disc are easy to grow up, the ball diameter is difficult to control, the water supply is changed in the gradient mode by realizing the six-level fan-shaped levels, the number of the cue balls in the pelletizing disc is effectively increased, the growing of the green balls is facilitated, and the ball diameter is easy to control.

In summary, the pelletizing method of the solid hazardous waste material by the steel dust mud rotary hearth furnace method realizes uniform material distribution and stable pelletizing by additionally arranging the material flattening device, simultaneously adopts six-grade fan-shaped level water supply, changes the water supply quantity in a gradient manner, improves various quality indexes of green pellets, particularly better controls the particle size of the green pellets, achieves the proportion of 6.3-16 mm above 95%, reduces the flow fluctuation of the green pellets within +/-2 t, and provides guarantee for stabilizing the roasting atmosphere of the rotary hearth furnace and improving the dezincification rate.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

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.