From the present situation of phosphorus ore resource development and utilization of a national perspective, the prevalence of technology is relatively backward, inferior ore with superior, high quality and low use and other issues, serious waste of resources; coupled with the country's phosphate rock phosphate rock with as much, the low grade ore The characteristics of many, difficult selection and selection have brought difficulties to the full and effective use of resources. As far as Hubei Province is concerned, phosphate rock with a phosphorus pentoxide content greater than 30% accounts for 9% of the total reserves. According to the current mining method, no high-grade phosphate rock resources can be harvested in five or six years, so How to use low-grade phosphate resources is an urgent problem to be solved. In the past, the state has invested heavily in the construction of two factories in Jingmen Wangji and Yishuping, Yichang County. Due to unsatisfactory process and efficiency, they have not been put into industrial production.
In order to make full use of the low-grade phosphate rock resources, in May 2004, Shennongjia Mining Company began to study the low-grade phosphate ore beneficiation work, and successively conducted beneficiation tests with a number of research institutes and institutes at home and abroad. They used a weight - joint flotation process, the phosphate rock phosphorus pentoxide content of about 18% by weight selected from enriched to 30% by flotation and then, finally obtained phosphorus pentoxide ≥36.5%, magnesium oxide <0.3%, silica> 4% phosphorus concentrate. In September last year, in order to meet the needs of industrial production, the company expanded the scale of the test and optimized the beneficiation process. Now it has succeeded in mass production of phosphorus concentrate products with a quality index of phosphorus pentoxide of 37% and magnesium oxide. 0.49%, silica 2.8%, product recovery rate of 50%. At the same time of the beneficiation test, they have done a lot of research on how to achieve clean and environmental protection. At present, the process has achieved zero discharge of water, phosphorus-containing waste residue for the production of calcium or kiln process phosphoric acid, phosphorus content less than 5%. Waste rock is used to produce non-burnt bricks and achieves "green beneficiation". Not only has the selection of magnesium been more successful, but it has also achieved a worldwide breakthrough in silicon selection, reducing silica from 11% to 1.6%. Experiments show that Yichang and China's collophanite are optional, which has found a way to achieve the comprehensive utilization of low-grade phosphate.
To build a large-scale mining and selecting enterprise and use the most advanced technology and technology to comprehensively utilize phosphorus resources. Although the current economic benefits are not significant, it has far-reaching strategic significance and remarkable society for improving the comprehensive utilization of phosphate resources in Hubei Province. Benefits, therefore, the company plans to build an annual processing of 1.2 million tons (Phase I) phosphate ore project, using a heavy-flotation beneficiation process to lower the phosphorus pentoxide content (including phosphorus pentoxide is about 18%), The medium and low grade ore with high impurity content is processed by ore processing to produce phosphorus concentrate with phosphorus pentoxide ≥ 36.5%.
It is reported that the feasibility study of the mineral processing project of Shennongjia Mining Company and the environmental impact assessment project have been completed. The total investment of the project is 90 million yuan, and the planned construction period is 12 months. At present, the company has selected a 200,000-tonne site in Yuan'an County, Hubei Province. The preparatory work is under intense pressure.
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