Phosphate rock apatite beneficiation method

 With the continuous development and utilisation of phosphorus ore resources, rich phosphorus ore and easy to select phosphorus ore resources are decreasing, the low-grade phosphorus ore, especially low-grade difficult to select the gum phosphorus ore beneficiation process technology research has been imminent.

       At present, the phosphorus ore beneficiation process is mainly flotation, scrubbing desliming process, gravity separation, roasting a digestion method, chemical leaching technology, photoelectric beneficiation and joint beneficiation process.

       1 flotation process

       Flotation has been regarded as the most effective method in phosphate ore dressing. Phosphorus ore flotation method includes direct flotation, reverse flotation, positive and negative flotation, anyway flotation and double reverse flotation process.

       2 Scrubbing desliming process

       This technology is mainly used for weathering type or phosphorus ore containing much mud. In Yunnan Dianchi area phosphorus ore and other areas of the surface weathering phosphorus ore can be used in this technology, and can obtain good economic benefits. This technology is the phosphorus ore for scrubbing, removing sludge, and then screening and grading. ‘Scrubbing desliming’ is a physical beneficiation method, its process is simple, can be open production, and does not consume chemicals, so the environment will not cause pollution.

       3 heavy media beneficiation process

       Heavy media sorting is a phosphorus ore re-election technology. This technology is based on heavy media cyclone as sorting equipment, the media aggravator is magnetite, using a section of washing and desliming and a coarse and a fine heavy media beneficiation process, to deal with the strip structure of the main phosphorus ore.

       4 roasting and digestion process

       This process is suitable for calcium phosphate ore, that is, phosphate ore with high carbonate content and low silicate content. Adopt roasting and digestion process, the lower the SiO content, the better, the highest should not exceed 5%. The process is usually in 900 ~ C roasting carbonate-containing phosphate ore r, carbonate minerals at high temperatures in the thermal decomposition of CO release, and then add water to digest CaO, MgO hydration, become fine grained Ca (OH): and Mg (OH)::, and then use the desliming, grading operations to get rid of calcium, magnesium hydroxide, so that the phosphorus ore enrichment.

       5 Chemical leaching technology

       Chemical leaching is a beneficiation method that applies chemical methods to reduce the impurity content and improve the purity of useful minerals. This method is mainly applicable to calcium phosphate ore with low carbonate content and very fine embedded particle size and separation of impurities in the flotation concentrate. The leaching agent can be ferric chloride, sulfuric acid or sulfur dioxide, etc., of which sulfuric acid is commonly used.

       6 Electrowinning technology

       Electrowinning is based on a variety of minerals have different electrical properties, in the minerals through the electric field when the role of these minerals on the difference between the electric power and mechanical force to sort out a method of mineral processing. Electrowinning for dry operation, does not produce waste water and environmental pollution, equipment structure is simple, easy to operate and maintain, low production costs, good sorting effect.