Several days ago, when I participated in a gypsum exhibition in Chengdu, I learned that up to now, the production of phosphogypsum in my country has reached 75 million tons per year, and the annual processing volume is only 40 million tons. In addition, the total amount of untreated phosphogypsum accumulated over the years has reached 800 million. Ton. As we all know, phosphogypsum is a kind of industrial waste with huge output, which contains undecomposed phosphate rock, free phosphoric acid, fluoride and other impurities, and a large amount of stacking will bring environmental safety risks. The treatment and application of environmentally-friendly pressure phosphogypsum is imminent. In addition to the impact of the dual-carbon issue on China's cement industry, gypsum is about to replace cement in the construction industry, and the production and application of phosphogypsum is about to enter the sunrise industry.

The application of phosphogypsum usually refers to the production of industrial by-product gypsum powder. The most important system is the drying and calcining system; they control the quality of semi-finished products and products at different stages of industrial by-product gypsum. The main purpose of drying and calcination is to dehydrate the dihydrate gypsum. Drying (removal of surface water), calcination (removal of crystal water).

The traditional calcination process equipment for phosphogypsum mainly includes wok, rotary kiln, boiling furnace, integrated grinding and calcination equipment, etc. Woks, rotary kilns, boiling furnaces, etc. mainly adopt stacked or fluidized heat exchange methods, which have long dehydration time, high heat consumption and low thermal efficiency; most of the integrated grinding-sintering calcining equipment is air-flow calcining equipment, although the process is simple, but the operation is not stable, which affects product quality. To this end, Henan Zhengzhou Mining Machinery Co., Ltd. has taken the lead in researching and developing new processes after visiting and learning from many industries, and has mastered the thermal processing technology of decomposition + calcining rotary kiln. This technology greatly reduces the dehydration time and energy consumption, and has a high thermal efficiency utilization rate to ensure production capacity. Currently, there are projects under construction in China and are expected to be put into operation by the end of the year.

After years of development, Henan Zhengzhou Mining Machinery Co., Ltd. has now become a high-tech enterprise with full-process technology integrating scientific research, design, manufacturing, installation, commissioning, and guarantee operation. It has environmental protection, building materials, mining and metallurgical chemical technology. A comprehensive company with the R&D and production capacity of complete equipment systems. The company’s main process system products: environmental protection technology: hazardous waste and solid waste treatment (phosphogypsum, sludge, fly ash, etc.), dust removal and flue gas purification, etc.; building materials technology: ceramsite, ceramsite sand, refractory, powder, Lime, cement process, etc.; beneficiation process: beneficiation of iron, aluminum, copper, lead-zinc, gold, fluorite, graphite, etc.; metallurgical process: metal magnesium production process (calcined white, pellets, reduction, refining); calcination/reburning Process: dolomite, limestone, magnesite, kaolin, bauxite, filter cake of sugar factory and paper factory, etc.