New process of solid-liquid extraction of phosphoric acid

Recently, Nanchang Jiate Science and Technology Co., Ltd. applied a solid-liquid extraction method to prepare a new 30,000-ton-ton industrial test plant built with the new technology of phosphoric acid, which has been continuously operated for more than 48 hours. The content of phosphorus pentoxide in the company is 21%. % of the low-grade phosphate rock ore fines, successfully produced 16% of the effective phosphorus content of Pu-calcium and more than 28% of the concentration of phosphoric acid, to meet the production of monoammonium phosphate, diammonium phosphate, ternary compound fertilizer needs. The new process technology for the preparation of phosphoric acid by solid-liquid extraction method 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 solvents and **, and processes such as leaching, extraction, impurity removal, and purification are used to produce dilute phosphoric acid products with a concentration of more than 28%. The reaction conditions are mild, the energy consumption is low, and the consumption ratio is low. The high-grade phosphate rock production process is 10% lower, and there is no waste water and waste gas discharge. The waste residue can be used to make cement and other building materials. Phosphorus pentoxide 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. Taking 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 effective phosphorus) is: phosphate rock (P2O5 content of 21.7% to 22.8%) The consumption of ** (93 acid) is about 0.4 tons, and the cost of the two main raw materials is about 100 yuan less 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, explained to 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 requires only investment of about 500,000 yuan, adding some equipment.

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%.