Phosphogypsum is the fertilizer of solid waste and the solid waste residue discharged from the production of phosphoric acid. With the development of the phosphate fertilizer industry in recent years, the discharge of phosphogypsum has increased to more than 10 million tons per year. These large quantities of phosphogypsum waste will occupy land and cause serious environmental pollution. Therefore, the rational transformation of phosphogypsum resources is imminent.
Phosphogypsum is an important renewable resource, which contains phosphorus, fluorine and other impurities. The main chemical components are CaO and SO3. Phosphogypsum mainly exists in four types of crystalline needle, flake crystal, dense crystal and crystal nucleus.
In the process of phosphoric acid production, some phosphate rocks do not decompose, the washing and filtration process of phosphogypsum is incomplete, and the addition of additives are the reasons for phosphogypsum containing phosphorus, fluorine and other impurities. Because of these impurities, phosphogypsum can not be directly used in the production of gypsum building materials, so it must be pretreated for use.
The production of building gypsum powder, gypsum board and gypsum block, as cement retarder, can produce cement, sulfuric acid and ammonium sulfate, can be made into paper filler, and can be used as soil conditioner in agricultural areas. The innovation of new technology is to extract rare earth elements from phosphogypsum.
Poland reported this technology as early as the 1990s, involving the extraction of rare earth from apatite, and conducted experimental research on the extraction and comprehensive utilization of phosphorus fossils and rare earth. It was learned that this innovative technology can solve three problems: extracting important rare earth metals from industrial wastes, stone paste building materials and waste recycling.
SMMVIK Machinery mill has a wide reputation in the field of non-metallic mineral processing, with high fineness of 80-3000 mesh and output of 80 tons / hour. SMMVIK Machinery ultra-fine mill is widely used in the reprocessing of phosphogypsum. If you are interested in our equipment, you are welcome to consult, We have professional customer service personnel to give you a detailed introduction. We look forward to your arrival.
