A coagulant for treating fine-grained high-clay slime water

Abstract

The invention discloses a coagulant for treating fine-grained high-clay coal slime water, which is prepared by uniformly mixing two or more of barite powder, calcite powder, dolomite powder and medical stone powder. The coagulant of the present invention is a mineral preparation, which is discharged together with the coal slime during use, does not accumulate in water, and does not affect water quality. The particles are easy to flocculate and settle, which speeds up the pressure filtration speed of coal slime and improves the quality and output of clean coal. The coagulant of the present invention, combined with a suitable flocculant, has a good effect when used to treat coal slime water with complex components and is difficult to settle, especially for high-clay, fine-grained coal slime water, the coagulation effect is obvious, and it can fully meet the actual production needs. The water content of the final coal slime filter cake is reduced to below 25%, and the content of suspended solids in the overflow water of the thickener is less than 150mg / L.

Description

technical field [0001] The invention belongs to the technical field of coal slime water treatment, and in particular relates to a coagulant for treating fine-grained high-clay coal slime water. Background technique [0002] Coal washing wastewater is the industrial tail water of the coal mine wet coal washing process, also called slime water, which contains a large amount of coal slime and silt, and direct discharge will cause serious pollution to the environment near the mining area. Coal slime water has become one of the main sources of pollution in the coal industry, and more and more people pay attention to it. Slime water generally has SS, COD, BOD 5 The characteristics of high concentration and extremely negative zeta potential not only have the properties of suspension, but also often have the properties of colloid, which is particularly stable and will not settle naturally after standing for several months, and the properties of coal slime water are similar to those...

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Problems solved by technology

[0008] However, this method can only remove most of the slime in the slime water, and the rest of the fine-grained slime remains in the overflow water and accumulates in the system through repeated cycles, resulting in a vicious cycle of mutual influence between increased circulating water concentration and reduced concentration efficiency. The floatability of coal slime is poor; and the balance of washing water is difficult to control, and closed-circuit circulation cannot be realized; in addition, when the slime water reaches a certain concentration, it must be discharged to ensure the concentration of circulating water, resulting in the loss of coal slime; the thickening equipment is huge and various

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