A kind of preparation technology of ultra-pure coal

Abstract

The invention discloses a preparation technology of super pure coal, and is applicable to the technical field of mineral separation. The preparation technology comprises the steps that after minus 50 mm low-ash anthracite is crushed through a high-efficiency fine crusher, the crushed low-ash anthracite is introduced into a three-product interference bed for separation, and coarse clean coal, medium coal and recrement are obtained; coarse clean coal is classified through a three-product vortex sieve, and coarse clean coal remaining on the sieve is dehydrated through a coal slime centrifuge to obtain a coarse-particle super pure coal product; and after primary coarse grinding, medium coal is introduced into a sieve bend for classification, oversize material on the sieve bend is introduced into a spiral separator for tailing discharging, and after secondary fine grinding, a light product is introduced into a flotation device for flotation together with screen underflows of the three-product vortex sieve, overflows, the centrifugate of the coal slime centrifuge, and screen underflows of the sieve bend, and a fine-particle super pure coal product is obtained. According to the preparation technology, a two-stage ore grinding technology is adopted, so that an overgrinding phenomenon which often occurs during open-circuit grinding is avoided; tailings are discharged during primary ore grinding, so that efficiency and energy consumption are achieved; the two-stage floatation is adopted, so that low-ash clean coal can be obtained; and compared with a traditional separation technology, the preparation technology has the advantages that the principle of more crushing and less grinding is better met, efficiency and energy consumption are achieved, and the economic benefits are remarkable.

Description

Technical field: [0001] The invention relates to a preparation process of ultra-pure coal, and is especially suitable for the preparation process of ultra-pure coal used in coal purification in the technical field of mineral separation. Background technique: [0002] Coal has always been the main energy source in our country and has made great contributions to the national economy. However, most of it is unprocessed when it is used. It not only has low conversion and utilization efficiency, great waste of resources, but also brings serious pollution to the environment. Normally, coal is only used as fuel, and its added value is low. However, with the continuous development of the national economy, there are more and more requirements for coal products. If coal is used to produce coal-based materials, it can increase its added value and improve economic benefits. Whether it is oil-substituting coal-water slurry or high-quality coal-based materials, there are high requirements...

AI Technical Summary

Problems solved by technology

However, it is difficult to prepare ultra-pure coal in the prior art, especially for fine-grained coal. The preparation is extremely unfavorable, so it is necessary to strengthen the dissociation to fully dissociate the organic matter and inorganic minerals in the coal, thereby reducing the ash content of the product

[0004] The conventional flotation process is to finely crush the coal sample and then go through the flotation column (or flotation machine) for a rough selection or a rough selection and a fine selection to obtain a low-ash product. This process is simple and convenient, but the energy consumption of the material is relatively small Large, clean coal is easily polluted by high ash and fine particles, resulting in high ash content. How to prepare ultra-pure coal with high efficiency and energy saving has become a difficult problem in the process of efficient and clean utilization of coal resources

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