"Crushing screening of calcining kiln" one-step has been in the domestic desulfurization gypsum, phosphogypsum and natural gypsum are widely used in production of building gypsum grinding equipment line, products are widely used in production area, such as gypsum board, brick, stucco gypsum. "Crushing screening of calcining kiln" one-step method is mainly used in the industrial by-product gypsum grinding equipment, the method is to dry - crushing - calcine - separation (get rid of clutter) - a complete modification, with minimal investment of equipment, the minimum coal consumption, power consumption, in the production of high-grade gypsum powder and a variety of products. The production technology can be widely used in the desulfurization gypsum, phosphogypsum and natural gypsum burning building gypsum powder production.

One of the most important process for the drying, crushing, calcine, sorting process:
Phospho gypsum is generated before phosphate rock has been ground into > 80 mesh kuangfen, substitution reaction with sulfuric acid to generate shape and particle size have no obvious change after the phosphogypsum, but phosphorus gypsum often contain a small amount of ground phosphate rock, and because of the long-term field stacking is often mixed with stones, coal, grain, sand, mud and garbage and agglomerate, the resulting problems are:
(1) drying before these impurities in the wet state of phosphorus gypsum can't points screen;
(2) these impurities without separation after drying, grinding into the plaster will seriously affect the quality of gypsum;
(3) the agglomeration of phosphogypsum is no guarantee that the uniformity of calcine.

So sieve forging kiln drying crush points in phosphogypsum into the kiln drying best grinding section to design a set of "soft crushing device", only to agglomerate, cannot crush other impurities. Calcine process after the completion of the qualified plaster of Paris with pneumatic separation to the next working procedure, all impurity separation out of kiln processing, so that the drying, crushing, calcine, four points screen the same process in the furnace, the furnace gypsum calcination temperature, time, easy to adjust parameters, such as air flow and calcine gypsum after modification, homogenization, cooling storage.