Electrolytic press filtration dewatering method for granule coal

Abstract

The invention relates to an electrolytic press filtration dewatering method for granule coal. Firstly, the granule coal is subjected to electrolytic treatment; surfactant Tween-40 and the like are used for preparing water-soluble electrolyte; a 36V and 0.5 to 1.5 A copper positive pole and a negative pole are used for electrolyzing the granule coal in an electrolytic tank; then the granule goal issent into a filter press for press filtration and is subjected to the secondary electrolytic dewatering treatment; after second electrolytic press filtration dewatering, the effect is obvious, and the granule coal is easily dewatered; the full water content of a press cake is lowered to 13.8% from 24.3% of dewatering in filter press and is lowered by 10.5%, and the dewatering rate of internal water is 71.7%. The method effectively solves the problems of difficult dewatering, storage and transportation, high water content, serious pollution and the like and has the advantages of high efficiency, good quality and possibility of continuous operation. The method can form a technological process of liquid addition, electrolysis, press filtration, second electrolysis, dewatering, press cake falling by blowing, and press cake collection. The method is ideal for granule coal dewatering.

Description

technical field [0001] The invention relates to an electrolytic filter press dehydration method for fine-grained coal, which belongs to the technical field of electrochemical treatment of fine-grained coal and coal preparation dehydration. Background technique [0002] With the continuous progress of coal mining technology, the degree of mechanization is getting higher and higher, and the particle size composition of coal is also undergoing great changes. It has high viscosity and high water content. In order to make fine-grained coal more widely used, it is necessary to dehydrate fine-grained coal. The dehydration treatment usually adopts vacuum filtration method and pressure filter dehydration method, but as the particle size of coal slime decreases Small, especially fine-grained coal with a particle diameter of less than 0.3mm, the dehydration effect is greatly reduced, and the dehydration quality and efficiency cannot meet the requirements. [0003] In order to increase...

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Problems solved by technology

[0002] With the continuous progress of coal mining technology, the degree of mechanization is getting higher and higher, and the particle size composition of coal is also undergoing great changes. It has high viscosity and high water content. In order to make fine-grained coal more widely used, it is necessary to dehydrate fine-grained coal. The dehydration treatment usually adopts vacuum filtration method and pressure filter dehydration method, but as the particle size of coal slime decreases Small, especially fine-grained coal with a particle diameter of less than 0.3mm, the dehydration effect is greatly reduced, and the dehydration quality and efficiency cannot meet the requirements

[0003] In order to increase the dehydration efficiency and improve the dehydration effect, some use improved equipment, or add filter aids, use new filter media, increase the filter area, and even use pressure filtration, but these are not ideal, and these methods can only remove water, it is powerless to remove internal water

[0004] my country is a large coal-producing country, and there is a common problem of high moisture in coal slime filtration products, which not only causes ineffective transportation of excess water, but also freezes wagons due to moisture in winter, resulting in difficulties in storage, loading and unloading, transportation, and excessive moisture. The high temperature will also cause the accumulation of slime water around the coal stacking site, and the clean coal will be lost with water, which will not only cause a waste of coal resources, but also pollute the environment. Therefore, it is of great significance to study the dehydration method of fine-grained coal.

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