Technology for treating coal slime water through secondary flow and settlement filtering centrifuge

Abstract

The invention discloses a technology for treating coal slime water through a secondary flow and a settlement filtering centrifuge, and belongs to the technical field of coal slime water treatment. The technology comprises the following steps that 1, coal slime water flows into a secondary flow classifying screen and is classified; 2, an underflow comprising coarse particles is fed into a filtering centrifuge and then is treated and an overflow comprising fine particles is fed into a condensation tank and then is concentrated; 3, the overflow concentrated by the condensation tank is utilized as circulating water for recycle and an underflow is fed into a filter press and then is treated; 4, filtrate obtained by the filtering centrifuge is fed into the filter press and then is treated and coal slime obtained by the filtering centrifuge is utilized as a product and is sold; And 5, filter cakes obtained by the filter press is coal slime, is utilized as a product and is sold, and filtrate obtained by the filter press is utilized as circulating water for recycle. In the invention, a settlement filtering centrifuge is utilized as a centrifugal hydroextractor. The technology provided by the invention reduces a floor space of a coal preparation plant, saves production time and reduces repairer labor intensity.

Description

technical field [0001] The invention relates to a treatment method of coal slime water. Specifically, it is a secondary flow and sedimentation filter centrifuge treatment process for coal slime water Background technique [0002] At present, the current process of coal preparation plant to treat slime water is the combination of thickener concentration and filter press dehydration. The process flow is as follows figure 1 shown. Its existing problems are: [0003] 1. It covers a large area. The diameter of the concentration pool is generally 20m, 25m, and 30m according to the different processing capacity. The filter press occupies an area of ​​50m according to the different processing capacity. 2 、60m 2 wait. [0004] 2. The processing capacity is small. A coal preparation plant with a processing capacity of 5.0Mt / a generally needs four thickeners with a diameter of 30m and six with an area of ​​60m 2 filter press. [0005] 3. The amount of maintenance is large. The s...

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Problems solved by technology

[0003] 1. It covers a large area. The diameter of the concentration pool is generally 20m, 25m, and 30m according to the different processing capacity. The filter press occupies an area of ​​50m according to the different processing capacity. 2 、60m 2 range

[0004] 2. The processing capacity is small. A coal preparation plant with a processing capacity of 5.0Mt / a generally needs four thickeners with a diameter of 30m and six with an area of ​​60m 2 filter press

[0005] 3. The amount of maintenance is large. The scraper of the concentrator is severely corroded in the slime water and is easily damaged. The filter cloth of the filter press is often replaced, otherwise it will affect its dehydration effect. If any of the above problems exist, it must be shut down to deal with it, which will affect the production time.

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