Settling method of solid substances in carboniferous system coal slurry water

Abstract

The invention provides a settling method of solid substances in carboniferous system coal slurry water, and solves the problems that great influence is caused to production of a coal preparation plant due to poor carboniferous system coal slurry water treatment effect. The settling method is characterized in that flocculant and polycoagulant are added in the carboniferous system coal slurry water, the flocculant adopts polyacrylamide with the molecular weight of more than 23 million and the degree of hydrolysis of 20% to 27%, the polycoagulant adopts polyaluminum cloride, the use level of the polyacrylamide is 3 to 4.4g / m<3>, the use level of the aluminium polychlorid is 40g / m<3>, the configuration concentration of the polyacrylamide is 100 ppm, and the configuration concentration of the polyaluminum cloride is 1,000 ppm. According to the settling method, the use level of the flocculant is greatly reduced, so that the thickness of the clear water layer in a thickener is larger than 1.5 m, the processing capacity of a pressurizing filter is increased by about 33%, the cost of the flocculant can be saved by 912,200 yuan every year, not only is the drug cost saved, but also the processing capacity of the pressurizing filter is increased, and the moisture of a filter cake is reduced.

Description

technical field [0001] The invention relates to a method for treating Carboniferous coal slime water, in particular to a method for settling solid matter in Carboniferous coal slime water. Background technique [0002] For a long time, coal mines have mainly mined Jurassic coal. As the reserves of Jurassic coal have decreased and the mining depth has increased, the amount of Carboniferous coal mining has increased year by year. The coal slime in Carboniferous coal contains a large amount of clay minerals. Severe mudification has brought great difficulties to the production of the coal preparation plant: [0003] 1. The overflow water of the concentrator has high turbidity, is milky white, and contains a large amount of high ash and fine particles. This part of the material enters the coal washing system with the circulating water. The impact of settlement will cause the concentration of overflow water to increase until it turns black for a long time, which will have a great...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the poor treatment effect of existing Carboniferous coal slime water has a great impact on the production of coal preparation plants, the present invention provides a method for settling solid matter in Carboniferous coal slime water

[0009] The types and parameters of the flocculant and coagulant added to the sedimentation method are obtained through a large number of experiments, including the sedimentation test of polyacrylamide with different molecular weights and different degrees of hydrolysis, and the sedimentation test shared by polyacrylamide and coagulant. The existing Carboniferous coal slime water treatment effect is poor, which has a great impact on the production of coal preparation plants