At the time of the Spring Festival, Nanchang Jiate Science and Technology Co., Ltd. applied the solid-liquid extraction method to prepare a new experimental plant with an annual output of 30,000 tons of phosphoric acid. It has been continuously running for more than 48 hours, and the company has used phosphorus pentoxide for more than 48 hours. The low-grade phosphate rock ore with a content of 21% has been successfully trial-produced with 16% of available phosphorus and 32% of phosphoric acid, which can meet the production needs of monoammonium phosphate, diammonium phosphate and ternary compound fertilizers. The new process technology for the preparation of phosphoric acid by solid-liquid extraction has created a new way for the production of phosphoric acid and compound fertilizer from low-grade phosphate rock in China.

According to reports, the technology is suitable for the production of dry and wet calcium polyfertilizers. The process reacts with self-developed solvent and sulfuric acid, and processes such as leaching, extraction, impurity removal, and purification are used to produce a dilute phosphoric acid product with a concentration of 28% or more. The reaction conditions are mild, the energy consumption is low, and the sulfuric acid consumption ratio is high. The production process of phosphate rock is 10% lower, and there is no waste water and exhaust gas discharge. The waste residue can be used to make cement and other building materials. Phosphorus oxide content of 15% to 22.8% of the low-grade phosphate rock using this new environmentally-friendly phosphating process, can produce a concentration of 24% to 28% of dilute phosphoric acid. The chemical fertilizer inspection department of Jiangxi Province has detected that the product quality has reached the national standard. The company started to design a software package for an annual production capacity of 50,000 to 100,000 tons of industrial production equipment on January 30. The first set of equipment is expected to start construction in the first half of this year.

At the same time, the use of this technology to produce dilute phosphoric acid has a lower cost and significant economic benefits. Take the low-grade phosphate rock in the Puyang area of ​​Hubei Province as an example, the average raw material consumption per ordinary ton of calcium (16% to 17% of available phosphorus) is: Phosphorite (21.5%~22.8% of P2O5) 0.9 ton The amount of sulfuric acid (93 acid) is about 0.4 tons, and the cost of the two main raw materials is about 100 yuan lower than the cost of traditional methods. Based on this estimate, a Calcium Calcium Enterprise with an annual production capacity of 100,000 tons can add nearly 10 million yuan each year. In addition, the equipment investment transformation is also relatively simple. Luo Wuzhao, senior engineer of the project researcher, told the reporter that the technical transformation of 50,000 to 100,000 tons of dilute phosphoric acid per year for the manufacturers of existing calcium production equipment is only required to invest about 500,000 yuan, and some equipment can be added.

Low-grade phosphate rock reserves are widely distributed in China, but have not yet been fully utilized, and mostly become waste. At present, it is necessary to produce qualified products with an effective phosphorus content of more than 16%. The content of phosphorus pentoxide should be at least 30%.

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