A Flotation Process for Fine Phosphate Rock

Abstract

The invention belongs to the technical field of phosphate ore beneficiation and flotation technology, and specifically relates to a fine-grained phosphate ore flotation process, which includes the following steps: 1) Ball milling: the phosphate rock is repeatedly ball-milled by a ball mill and a spiral classifier, and ground to the desired Fineness is required; 2) Reverse flotation decarburization and demagnesium removal: add water to adjust slurry, and perform decarburization flotation under the condition of pH5.4 to pH5.8 to reduce the influence of organic carbon on flotation desiliconization and demagnesia removal; 3 ) Desiliconization by positive flotation: add sodium carbonate to adjust the decarburization and demagnesia concentrate pulp, and perform desiliconization and flotation under the condition of pH9.5 to pH9.8; The ore pulp is subjected to demagnesization flotation under the condition of pH5.3 to pH5.6. The advantage of the present invention is that it can effectively recover useful minerals from fine-grained phosphate rocks in order to solve the serious problem of particle size differentiation of phosphate rocks, improve the separation effect of fine-grained phosphate rock flotation, and realize phosphate rock Rational use of stone resources.

Description

technical field [0001] The invention belongs to the technical field of phosphate rock beneficiation and flotation technology, and in particular relates to a microfine-grained phosphate rock flotation technology. Background technique [0002] Phosphate rock is an important chemical raw material, and phosphorus is an essential element for plant growth. my country is rich in phosphate rock resources, with a resource reserve of 16.7 billion tons and an average grade of 17%. Most of them are sedimentary-type low-grade phosphorites and cannot be directly utilized. Apatite is the target mineral for beneficiation and recovery in ore. It is mainly distributed in coarse grains. This embedded apatite is easier to dissociate in the grinding process, but fine-grained potassium is often seen in its particles. Feldspar, dolomite, quartz, organic carbon and particulate pyrite exist in the form of inclusions. These micro and fine-grained inclusions are difficult to dissociate from the apati...

AI Technical Summary

Problems solved by technology

Apatite is the target mineral for beneficiation and recovery in ore. It is mainly distributed in coarse grains. This embedded apatite is easier to dissociate in the grinding process, but fine-grained potassium is often seen in its particles. Feldspar, dolomite, quartz, organic carbon and particulate pyrite exist in the form of inclusions. These micro and fine-grained inclusions are difficult to dissociate from the apatite monomer during the grinding process and will partly enter The quality of the final concentrate is affected by the phosphorite concentrate; the apatite is next to the potash feldspar, dolomite and other gangues in an irregular shape and is closely adjacent to each other. This kind of apatite with embedded characteristics is difficult to Completely dissociated with the gangue mineral monomer, some apatite will be lost in the tailings during the beneficiation process or some gangue minerals will enter the phosphorus concentrate and affect the quality of the final concentrate; a small amount of apatite is medium, Fine particles are embedded in minerals such as potassium feldspar, and the apatite with this embedded feature can be better dissociated from gangue mineral monomers only under the condition of fine grinding

[0003] In recent years, due to serious particle size differentiation of phosphate rock, fine-grained minerals and coarse-grained minerals are mixed with each other, resulting in complex beneficiation process, large dosage of chemicals, and low separation efficiency

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