Coal slime water two-stage filtration process

Abstract

The invention discloses a slime water two-stage filtering technology including slime water staged treatment and two-stage filtering by means of a filter press. After slime water is subjected to 0.074-mm grading, slime water containing slime with the granularity larger than 0.074 mm enters a slime water barrel to serve as materials of first-stage filtering of the filter press; slime water containing slime with the granularity smaller than 0.074 mm enters a rake type thickener, and bottom flow of the rake type thickener serves as materials of second-stage filtering of the filter press. Slime filter cakes obtained in first-stage filtering of the filter press serve as filtering media of second-stage filtering, and after being gathered, first-stage filtering liquid and second-stage filtering liquid enter circulating water. The slime water two-stage filtering technology is simple in process and easy to implement. Compared with slime water whole-grain-stage filtering, the slime water two-stage filtering technology is short in filtering time and low in solid content in the filtering liquid, treatment amount of the filter press is large within the same time, and guarantee is provided for recycling and washing water closed circulation of a coal preparation plant and a slime plant.

Description

technical field [0001] The invention relates to a coal slime water filtration process, in particular to a coal preparation plant coal slime water classification treatment and two-stage filtration process. Background technique [0002] my country's coal washing is mainly based on wet separation (such as gravity separation, flotation), and wet separation needs to consume a lot of water. Coal washing water will contain a large number of fine particles after the washing process, and coal washing wastewater containing suspended particles with a particle size of less than 0.5mm is usually called slime water. Slime water in coal preparation plants generally uses pressure filtration or pressurized filtration for solid-liquid separation. Slime water filtration can not only reduce product moisture, but also avoid the accumulation of fine mud circulation, ensure that the concentration of circulating water is stable in a lower range, and realize the cleaning of coal preparation plants. ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of slow filtration speed, high solid content of the filtrate and small processing capacity of the filter press in the existing coal slime water filtration process, the present invention provides a coal slime water two-stage filtration process with classified treatment and two-stage filtration

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