Closed circuit grinding method by adopting unified classification mode

Abstract

The invention relates to the technical field of mineral processing, in particular to a closed circuit grinding method by adopting a unified classification mode. The method comprises the steps that (1)ground pulp is directly fed into a hydrocyclone for classification; (2) hydrocyclone fine-grained overflow pulp in the first step is conveyed into a vibrating sieve, and the sieve mesh size is 0.23mm; (3) pulp according with the grain size requirement and passing the vibrating sieve in the second step is conveyed to the next working procedure, and plus sieve rough grains and hydrocyclone underflow jointly return to a mill for ore grinding; and (4) a product after ore grinding and ground raw ore are jointly fed again into the hydrocyclone for classification, forming a section of closed circuitgrinding of unified classification. The mineral separation processing cost is reduced, and meanwhile the comprehensive utilization level of low-grade uranium-boron-iron associated minerals is improved.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a beneficiation process of low-grade uranium-boron-iron associated ore using a high-pressure roller mill. Background technique [0002] The boron ore deposit where boron and iron are symbiotic, the main ore minerals are magnetite and boronite, followed by fibrous boronite, Suianite, and crystalline uranium ore. Iron, boron, and uranium are important raw materials for steel, chemical industry, and energy. However, the primary ore and useful minerals are finely distributed and have complex intergenerational characteristics, which cause many difficulties for the comprehensive utilization of ore. [0003] The existing beneficiation process mainly adopts two-stage grinding and classification-two-stage magnetic separation process to recover iron ore concentrate. The two-stage magnetic separation comprehensive tailings are screened into two particle sizes and then re-selected...

AI Technical Summary

Problems solved by technology

The outstanding problems of this process are high grinding power consumption, low processing capacity of the mineral processing process, insufficient dissociation of iron and boron monomers, especially when the processing capacity of the mineral processing process is increased, the coarsening of the grinding particle size results in coarse particle size of the magnetic separation tailings , the dissociation conditions of uranium cannot be reached, and the quality of uranium concentrate is unstable. At the same time, due to ore depletion, the boron grade of the raw ore entering the mill is only 4-5%, and the boron grade of a section of weak magnetic tailings is only 5-6%. The second-stage weak magnetic tail is discarded after the synthesis of boron concentrate affects the grade of boron concentrate, resulting in a waste of resources

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