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It is understood that in the first half of this year, the State Environmental Protection Administration conducted a 1.2 million-ton/year ammonium phosphate project for Yunnan Sanhuan Chemical Co., Ltd., and 300,000 tons/year of phosphoric acid and 600,000 tons/year ammonium phosphate plant demonstration projects in Yunnan Furui Chemical Co., Ltd. Twenty chemical and petrochemical construction projects carried out environmental risk investigations. In the investigation results report recently announced, the phosphogypsum slag was first classified as hazardous solid waste. According to the "National Solid Waste Pollution Prevention and Control Law," this means stricter requirements for its transportation, storage, processing, and utilization. At present, there are more than 100 million tons of phosphogypsum residues that are currently stored in China and are newly added each year. More than 20 million tons of phosphogypsum must be disposed of as hazardous solid waste.
Phosphogypsum is a by-product of the extraction of phosphoric acid from the production of phosphoric acid by the sulfuric acid method. It produces 4.5 to 5.5 tons of phosphogypsum per ton of phosphoric acid produced. The large amount of phosphogypsum emissions not only takes up a large amount of land, but also due to the different composition of the phosphate ore and lax control of the production process, among which the water-soluble inorganic fluorides and acidity, etc. may reach the targets of hazardous waste, and then pass the non-conforming requirements. Stacking causes environmental pollution. China is currently the world’s largest producer of phosphate fertilizers, and it is also the largest phosphogypsum by-product country, with a large amount of disposal.
At the meeting, the participating experts recommended the promotion of mature and reliable treatment technologies, and advocated the use of phosphogypsum as a cement retarder and building material instead of natural gypsum, and seized the opportunity of banned clay bricks in many cities, replacing phosphogypsum products with clay bricks. . In encouraging phosphate fertilizer companies to comprehensively use phosphogypsum, downstream users should also be encouraged to use phosphogypsum products. Phosphorus fertilizer companies now use phosphogypsum as a cement retarder, which is exempted from value-added tax (VAT) concessions, while cement companies that sell it to cement companies are not tax deductible because of no value-added tax. Cement companies are not willing to use it. Only cement companies have the same incentives to use.
SEPA clarifies phosphogypsum slag as hazardous solid waste for the first time
The reporter learned from the work conference on promoting the recycling of phosphorus and sulfuric acid held in Shenyang from July 14th to 16th. The State Environmental Protection Administration recently released the report on the results of the environmental risk investigation of 20 chemical and petrochemical construction projects. Gypsum residue is classified as hazardous solid waste. This action by the State Environmental Protection Administration has caused the phosphate fertilizer industry in China to suddenly increase the management pressure of 100 million tons of phosphorus gypsum slag, and will also have an impact on the future production of phosphate fertilizers.