Phosphate rock is the primary raw material in the preparation of fertilizer, it is an important chemical raw materials.
Whether the supply of phosphate ore can meet the needs of phosphate fertilizer production is related to the sustainable development of China's economy, related to the country's food security, and ensuring the sustainable development of China's phosphate industry is of great significance to national security and stability.
Phosphate mine is one of the dominant minerals in China, and its reserves are quite abundant. With the deep development of geological work, there will be new growth in phosphate reserves. However, the distribution of phosphate resources in China is extremely unbalanced. More than 80% of the reserves are concentrated in Yunnan, Guizhou, Sichuan in the southwest and Hubei and Hunan in the south-central. At the same time, there are many low-grade phosphate mines and few rich minerals.
China's phosphate rock grade is less than 18% of the reserves accounted for about half, P2O5 greater than 30% of the rich ore reserves accounted for only 22.5% of the national reserves. National average grade of phosphate rock P2O5 is only about 17%, so the vast majority of phosphoric acid and phosphate must be to meet the high concentration phosphate fertilizer production requirements after beneficiation enrichment. Therefore, the research on phosphate ore dressing technology is of great significance for the development and utilization of phosphate rock in China, the establishment of a reliable concentrating plant, the production of qualified phosphate concentrates, and the improvement of the comprehensive utilization rate and added value of resources. Flotation is the most effective method for phosphate ore dressing.
This project is aimed at flotation process selection, flotation process conditions and flotation reagent test of a high siliceous phosphate rock mine in Yunnan to determine the best flotation scheme.
A high siliceous phosphate rock ore in Yunnan contains 25.41% P2O5 and 31.66% SiO2, both of which are higher. The content of harmful elements MgO, Fe2O3 and Al2O3 are lower, and P2O5 has higher utilization value. The raw ore uses a rough selection, a sweeping process, using the new collector YZ-10 as a collector, the new inhibitor DX-12, at pH 9.0-9.5, inhibitor DX-12 (rough selection + sweep) 400g/t+200g/t, collector YZ-10 (rough selection + sweeping) 400g/t+400g/t, can obtain a yield of 69.60%, P2O5 grade 30.62%, recovery rate of 83.87% phosphorus Concentrate.
In this paper, the mechanism of action of regulators, inhibitors and collectors was studied.
The main components of the adjuster sodium carbonate in the solution are HCO3- and CO32-; the mechanism of action of the composite collector on the collophanite is discussed. The adsorption of the composite collector on the surface of the collophane is actually chemical adsorption. The result of the interaction of physical adsorption and chemisorption; the inhibitor water glass and fluorosilicate work together to promote the formation of colloidal silicic acid, and enhance the inhibition effect of colloidal silicic acid and HSiO3 on SiO2.
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