Phosphogypsum is an industrial solid waste produced when high-concentration phosphate compound fertilizer is produced after decomposing phosphate rock with sulfuric acid and extracting phosphoric acid.

 

Compared with natural gypsum, phosphogypsum contains a lot of impurities, such as soluble phosphorus, fluorine, alkali metal salts and organic matter, and some even contain heavy gold such as lead, zinc and chromium, or toxic and harmful substances such as cadmium, mercury, and arsenic. It affects the performance of building products and is directly harmful to the human body. Therefore, the phosphogypsum must be pretreated first. In order to achieve high-efficiency and energy-saving solid waste utilization, the pretreatment scheme must be low-cost, large-scale and harmless.

 

At present, the treatment methods of phosphogypsum in my country mainly include: acid-base neutralization modification method, water washing method, flotation method, sieving method, aging method, and calcination method. The composition of the phosphogypsum produced by each factory is different. In the actual application process, it is necessary to select a combination of multiple processes according to the characteristics of the phosphogypsum. For example, Yunnan phosphate rock is mainly made of silicon-based phosphate rock with low and medium taste, and the silicon content is relatively high. Therefore, the silicon content in phosphogypsum is relatively high. Therefore, relevant processes must be formulated for reducing the silicon content during pretreatment.

 

As an equipment manufacturer of phosphogypsum processing production line, Henan Zhengzhou Mining Machinery Co., Ltd relies on the technical and theoretical support of Zhengzhou University Chemical Research Institute, survives on quality, and develops with science and technology. It can provide you with professional technology and equipment support in phosphogypsum processing.