Desliming double-reverse flotation method for reducing impurity elements of phosphorite

Abstract

The invention discloses a desliming double-reverse flotation method for reducing the impurity content of phosphorite. The desliming double-reverse flotation method comprises the steps that crushed phosphorite is firstly subjected to wet screening, and oversize materials enter a flotation section after being ground to the qualified particle size; undersize materials are subjected to grading and tailing pre-discarding, and graded coarse-particle-size materials are subjected to ore grinding or flotation operation according to conditions. And the flotation operation can be performed by firstly performing magnesium and iron removal reverse flotation and then performing silicon and aluminum removal reverse flotation on the product in the tank, or can be performed by firstly performing silicon and aluminum removal reverse flotation and then performing magnesium and iron removal reverse flotation on the obtained silicon and aluminum removal rough concentrate to obtain the flotation concentrate. According to the method, different process routes are selected according to the properties of selected ores by reasonably utilizing the difference of physicochemical properties of gangue minerals and phosphorite minerals, and the desliming operation with lower cost is combined with the reverse flotation silicon and aluminum removal operation with stronger adaptability and the reverse flotation magnesium and iron removal operation, so that the magnesium and iron impurities can be efficiently removed; and meanwhile, a cation flocculation reverse flotation process is introduced to solve the problems of foam fluidity and ore adaptability in a desilicication and aluminum reverse flotation operation section. Phosphorus concentrate products of different grades can be produced, and different levels of requirements of downstream phosphorus chemical industry are met.

Description

technical field [0001] The invention relates to a combined phosphate rock beneficiation process, in particular to a desliming double-reverse flotation method for reducing impurity elements in phosphate rock. Background technique [0002] Phosphate rock is the basic raw material for the phosphorus chemical industry. The latter is mainly processed into phosphoric acid and elemental phosphorus by wet and thermal methods, and then processed to produce chemical fertilizers for agriculture and fine phosphorus chemicals for industry. Among them, the acid processing of impurities MgO, R in phosphorus concentrate 2 o 3 (Fe 2 o 3 、Al 2 o 3 ) and SiO 2 The content of phosphorous concentrate has different index requirements, and the phosphorous concentrates of excellent, first-class and qualified phosphorous concentrates can meet the needs of raw materials for different downstream phosphorous chemical products. [0003] After several years of development, the reverse flotation ma...

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Problems solved by technology

[0004] At present, the conventional positive and negative flotation process has achieved good concentrate indicators in the laboratory and pilot test stages. The magnesium, iron, aluminum and silicon impurity elements in the concentrate are relatively low, but the use of acid and alkaline return water is more complicated. Poor fluidity of foam in flotation operation and high cost of beneficiation have always been a problem that has plagued the industry, resulting in difficulties in engineering utilization

[0005] However, the subsequent development of mixed single-reverse, double-reverse, triple-reverse flotation (combination of reverse flotation dealumination, reverse flotation desiliconization and reverse flotation demagnesia) or other joint processes often have lower efficiency in removing iron, aluminum and silicon. High, poor adaptability to ore, often only suitable for phosphate rock in some mining areas, and when dealing with phosphate rock containing clay (such as kaolinite, montmorillonite, illite and mica, etc.) in Yunnan, Guizhou, etc., reverse flotation Desiliconization and dealumination foam has high viscosity and extremely poor fluidity. The process adaptability and index stability need to be improved, and the follow-up promotion is difficult and the application range is narrow.

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