Of phosphorus resources is a big country, but low phosphorus resources in northern phosphorus, phosphorus iron ore beneficiation plant in the northern most to magnetic separation process magnetite recovery of them, while discarding magnetic separation tailings, waste of resources caused by phosphorus. According to China's sustainable development strategy of mineral resources, we pay attention to the comprehensive recycling of low-grade phosphate rock in the north, which can rationally utilize resources and reduce the transportation pressure of South Phosphorus and North Transportation.
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The apatite mine in this paper was taken from a phosphate mine in western Liaoning. The mineral ore analysis of the original ore of the plant, the P_2O_5 grade in the ore is about 3.0%, and the Fe_2O_3 grade is about 12%. The phosphate rock is mainly composed of silicate minerals, and the gangue mineral mainly contains feldspar , dolomite, quartz , mica and the like. The current process of the plant is crushing-grinding-flotation-magnetic separation. The problem is that the Fe_2O_3 content in the phosphate concentrate of the plant is 3.11%, and the iron content is high, which affects the industrial index of phosphorus. Moreover, the use of magnetic flotation after flotation firstly causes waste of flotation reagents, so the rationality of the process needs to be studied. In this paper, the original process is improved. Firstly, a large amount of iron minerals are removed by magnetic separation, which not only reduces the amount of flotation agent but also reduces the content of Fe_2O_3 in the phosphate concentrate.
The ore is determined by chemical analysis, electron microscopy and XRD to determine the chemical composition, structure, mineral composition and characteristics of the ore. Determine the mineral symbiosis relationship and the inlay size. Analyze the influence of mineral composition and structure on mineral processing. Provide a basis for grinding and flotation reagent systems.
Grinding is an important part of preparation before sorting. Firstly, the small ore split test of raw ore crushed products is carried out to analyze the distribution of P_2O_5 and TFe in each grade. Then through the test to find out the relationship between feed concentration and grinding time and grinding fineness, according to the influence of grinding fineness on magnetic separation and flotation, the optimal grinding system is finally determined: grinding concentration 60%, grinding Time 15 min, grinding fineness - 200 mesh 82%. Through the influence of magnetic separation concentration and magnetic field strength on iron ore recovery rate and grade, the optimal pulp concentration of magnetic separation is 25% and the magnetic field strength is 3175Oe.
Oxide wax is an effective collector of phosphate rock during flotation, and the best capture ability is at 25 °C. The gangue minerals are mainly silicate minerals, which are selected from water glass inhibitors; followed by carbonate minerals, which can be adjusted with sodium carbonate. The optimum dosage of flotation reagent was determined by orthogonal test: 600g/t of collector, 1200g/t of water glass, 100g/t of foaming agent, 500g/t of sodium carbonate; recovery rate and grade of apatite It reached 92.24% and 32.27% respectively, meeting industrial requirements. The new beneficiation process was determined through research: crushing-grinding-magnetic separation-flotation. The full recovery of phosphate rock and iron ore also saves the amount of flotation agent added and reduces the iron content of the phosphate concentrate.