Coagulant for treating fine-grain high-viscosity soil coal slime water

Abstract

The invention discloses a coagulant for treating fine-grain high-viscosity soil coal slime water, and the coagulant is prepared by evenly mixing more than two of barite powder, calcite powder, dolomite powder and medical stone powder. The coagulant is a mineral preparation, and when the coagulant is used, the coagulant can be discharged along with coal slime in usage, cannot be accumulated in water and cannot influence the water quality; the coagulant can change the electrical property of the surfaces of coal slime particles, so that high-viscosity soil mineral and the coal slime particles are easily flocculated and precipitated, the filter pressing speed of the coal slime is increased, and the cleaned coal quality and yield are improved. The coagulant can be matched with an appropriate amount of flocculating agents, the effect is good when the coagulant is used for treating the coal slime water which is complex in components and difficult to precipitate, the coagulation effect is obvious especially for the high-viscosity fine-grain soil coal slime water, and actual production requirements can be completely met; the water content of treated coal slime filter cakes is decreased below 25 percent, and the content of suspended matter in thickener overflow water is smaller than 150 mg/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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