Introduction of phosphogypsum
Phosphogypsum is a kind of solid waste residue produced in the process of phosphoric acid production, which is mainly composed of calcium sulfate. The main composition of phosphogypsum is CaSO4·2H2O. In addition, it contains many other impurities. China produces and discharges tens of millions of tons of phosphogypsum every year. Most of phosphogypsum is mainly deposited on land, and the comprehensive utilization rate of phosphogypsum is less than 20%.
How to deal with phosphogypsum residue?
In addition to the “in situ solution” of phosphogypsum, which is a way to make green plants and green mountains and waters for the common people, in recent years, the local environmental protection department has also explored some new ways to make phosphogypsum into gypsum powder, gypsum board and subgrade that can be comprehensively utilized. At present, from the technical point of view, there are three main ways: one is to produce sulfuric acid and cement or calcium oxide; Second, as cement retarder; Third, the production of new gypsum building materials.
Equipment for phosphogypsum residue treatment?
Whether it is made into any of the above works, it needs secondary crushing, grinding and powder mixing and other processes. We are committed to research and development, after nearly 50 years of research and development for gypsum slag vertical mill. This equipment can grind materials with water content from 20% to 30% (such as calcium carbide slag, lignite, etc.) to materials with water content less than 1% (cement clinker, etc.), and has strong adaptability to materials.