A selective flocculation and separation process of fine-grained coking coal

Abstract

The invention relates to a selective flocculation separation process for micro-fine particle coking coal. The selective flocculation separation process is suitable for coal washing. The process includes the steps that firstly, ore pulp, a flocculating agent and a dispersing agent are fed into a stirring device for intense stirring for 2 minutes, and the ore pulp is sufficiently dispersed; secondly, gentle stirring is carried out for 2 minutes, and target ore grains and parts of non-target particles have the flocculation phenomenon under the effect of the flocculating agent; the ore pulp is subject to intense stirring for 2 minutes again, and the parts of non-target particles are separated from active sites on flocculating agent molecules; during follow-up gentle stirring, exposed active sites are combined with the target ore grains, and the flocculating purifying process is completed; and the ore pulp obtained after flocculating is fed into a countercurrent air inflation type flotation column to be subject to separated operation in the static environment, and the micro-fine particle mineral separation is completed. The selective flocculation separation process solves the problem that the hybrid flocculent phenomenon exists, coal flocculation and gangue flocculation avoiding are achieved to the maximum degree, and damage to flocculation clusters is avoided; the process is simple in technological process, less in investment and low in running cost; and scarce coking coal resources are effectively recovered.

Description

technical field [0001] The invention relates to a coal sorting process, and is especially suitable for the selective flocculation and sorting process of microfine coking coal used in coking coal microfine particle sorting. Background technique [0002] The invention is a practical technology based on the crushing and selective flocculation of fine-grained coking coal, and its main purpose is to solve the problem of fine-grain particle separation and recover scarce coking coal resources. [0003] The reasons for the generation of fine particles are as follows. On the one hand, with the continuous improvement of the degree of mechanized coal mining in my country, the continued deterioration of resource and geological conditions, and the wide application of dense medium coal preparation technology in coal preparation plants, the quality of selected coal in my country is constantly changing. Poor, the proportion of fine-grained coal slime produced in the sorting process increased...

AI Technical Summary

Problems solved by technology

Flotation is the most widely used conventional separation technology for fine-grained coal. However, the effective lower limit of flotation is generally 0.045 (0.074) mm, and the flotation effect will be greatly deteriorated when it is lower than this value.

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