Process for balling by mixing 200 meshes of celestite mineral powders and reduction coals

Abstract

The invention relates to a process for balling by mixing 200 meshes of celestite mineral powders and reduction coals. The process comprises the steps of (1) stirring and uniformly mixing the celestite mineral powders, the reduction coals and bentonite to obtain a raw material; (2) stirring industrial polypropylene glycol by water so as to completely dissolve the polypropylene glycol, and configuring the polyvinyl alcohol to be 20g / L of polypropylene glycol solution, then adding water and diluting the polypropylene glycol solution to be 2-4g / L of polyvinyl alcohol solution; and (3) spraying and adding the polypropylene glycol solution into the raw material, stirring and mixing uniformly, then extruding and balling on a ball pressing machine until the grain size of a ball body is 15mm, and the water content of the ball body accounts for 5-7% of the total weight of the ball body; and (4) drying the ball body obtained from the step (3) to constant weight, and roasting the dried ball body according to a conventional process to be used for producing strontium carbonate. According to the process, few devices are invested, the cost is low, the process is simple, and impurities capable of affecting the quality of strontium carbonate are not introduced into the raw materials.

Description

technical field [0001] The invention relates to the technical field of strontium carbonate production, in particular to a process for mixing and pelletizing 200-mesh celestite ore powder and reduced coal. Background technique [0002] The proven reserves of celestite in the Dafengshan area of ​​the Qaidam Basin in Qinghai reach more than 20 million tons, making it the largest strontium deposit in the world. The grade of strontium ore is low, the content of strontium sulfate in celestite mine is between 30% and 50%, and the particle size is fine. The roasting process for the preparation of strontium carbonate by the conventional black ash method is that celestite with a particle size of 1-5 mm and anthracite undergo redox reactions at 1000-1200 ° C to form strontium sulfide. Celestite mineral powder and coal powder are roasted in the rotary kiln according to the conventional process. The negative pressure in the rotary kiln causes the mineral powder to be sucked away by the ...

AI Technical Summary

Problems solved by technology

Celestite mineral powder and coal powder are roasted in the rotary kiln according to the conventional process. The negative pressure in the rotary kiln causes the mineral powder to be sucked away by the induced draft fan, the yield of strontium decreases, and the waste of strontium resources is serious, causing pollution to the environment and cannot be restored by conventional roasting process. strontium sulfate to strontium sulfide

200-mesh celestite concentrate agglomeration process, rolling in the disc pelletizer to collide with each other and compact the balls, the particle size of the spheres is controlled at 10~12mm, and the falling strength of the pellets is 4.6~4.7 times·0.5m -1 , in the roasting process of producing strontium carbonate by the black ash method, the particle size of the spheroids of the ore powder is too large, the reaction is not complete, the yield of strontium is reduced, and the waste of strontium resources is caused