Sorting process for high-ash and difficult-separation coal slime

Abstract

Disclosed is sorting process for high-ash and difficult-separation coal slime. Floatation coal slime is fed into a stirring barrel to be prepared into ore pulp with percentage concentration of 80g / L-120g / L, the ore pulp automatically flows to roughing and floatation equipment to be sorted, roughing tail coal enters a cyclone to be concentrated in a classified manner, concentrated bottom flow products enter a high-frequency screen to be dewatered, dewatered substances on the high-frequency screen return to roughing pulp mixing operation to be sorted again after being finely ground via a ball mill, floatation rough and fine ores are fed to a precipitation perforated basket centrifuge to be dewatered, after being dewatered via the precipitation perforated basket centrifuge, fine ore filter liquor is fed into concentration flotation equipment to be concentrated, and concentration tail coal and overflow of the ball mill return to roughing pulp mixing operation together via a pipeline to besorted again. Accordingly, low-ash and high-recovery-rate flotation clean coal is obtained. The sorting process not only avoids influence of high-ash content and fine particle slime and integrated ore to a floatation process, but also avoids contradiction between the quality and the recovery rate of a high-ash difficult-separation coal slime sorted product.

Description

technical field [0001] The invention relates to a separation process of coal slime, in particular to a separation process of high-ash refractory coal slime suitable for rough separation of clean coal, fine grinding, dissociation and re-selection. Background technique [0002] With the improvement of my country's coal mining mechanization, the deterioration of resource geological conditions, the large-scale construction of coal preparation plants and the wide application of dense medium separation technology, the proportion of high-ash refractory coal slime has increased sharply, and its characteristics are mainly manifested in coal slime. Large coal content, high ash content, fine particle size, and poor selectivity. Among them, the content of -200 mesh fine coal increases, resulting in the high ash content of flotation clean coal often due to the entrainment of high ash and fine mud, and the coarse-grained joints also interfere with the flotation process, and the ash content...

AI Technical Summary

Problems solved by technology

This process is mainly suitable for the separation of conventional easy-to-separate coal slime, and is widely used in my country. However, for high-ash difficult-to-separate coal slime, this process has the defects of low product recovery and production efficiency, and it is difficult to solve the problem of high-ash fine mud entrainment and The influence of conjoined minerals on the flotation process, so the development of key technologies suitable for high-efficiency separation of high-ash refractory coal slime has become a problem that needs to be solved urgently in the process of efficient and clean utilization of coal resources

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