A dissociation and re-election process of coking powder mid-coal

Abstract

A dissociation and re-selection process for high-ash and difficult-to-select coking powder coal, which belongs to the field of coal washing. Feed the raw medium coal into the crushing equipment for crushing. The crushed products enter the spiral separator for separation to remove the high-density materials in the feed. The low-density materials are fed into the short-body mill, and the ground products are It enters the three-product cyclone classification screen for classification, the overflow and underflow of the classification screen enter the flotation system, and the underflow returns to the spiral separator for re-sorting and dissociation. The sorting density is high, and the spiral tail throwing prevents high ash particles from entering the mill, which not only reduces the load of the mill, but also avoids the pollution of clean coal caused by the crushing of high ash particles.

Description

technical field [0001] The invention relates to a dissociation and re-selection process, which is especially suitable for the dissociation and re-selection process of coking powder mid-coal used for recovering scarce coking coal resources. Background technique [0002] The present invention is based on the practical technology of crushing and re-selecting coking powder mid-coal, and its main purpose is to recover scarce coking coal resources. [0003] With the continuous improvement of the degree of mechanized coal mining in my country, the continued deterioration of resource geological conditions and the wide application of dense medium coal preparation technology in coal preparation plants, the quality of my country's selected coal continues to deteriorate, and the fine-grained coal produced during the separation process The proportion of mud increased sharply, and the coal gradually showed the characteristics of "poor, fine, and miscellaneous" and continued to deteriorate....

AI Technical Summary

Problems solved by technology

If it directly enters the flotation process, if this part of the medium coal enters the clean coal during the flotation process, it will constitute clean coal pollution, and if it enters the tailing coal, the ash content of the tailing coal will be low, so the non-dissociation recovery effect will inevitably be affected. The process of dissociation and re-election of coal, such as the one-stage grinding-flotation process, has some problems such as over-grinding of gangue and excessive ash content of flotation clean coal after grinding. Therefore, how to dissociate and sort medium coal is worth thinking Therefore, it is very necessary to develop a practical technology that can efficiently recover low-ash clean coal in medium coal. This will not only greatly promote the progress of fine-grained refractory coal slime separation technology, but also help the scarce coking coal resources Secondary recycling has great economic value

Images