Method for precipitating and clarifying coal slime water assisted by extra electric field

Abstract

The invention discloses a method for precipitating and clarifying coal slime water assisted by an extra electric field. The method is characterized in that the extra electric field is added to the coal slime water by utilizing negative charges carried in coal slime particles in the coal slime water so that the coal slime particles carrying the negative charges in the coal slime water move towards an anode plate under the action of the extra electric field, thereby achieving the rapid precipitation of the coal slime particles in the coal slime water. By using the method, coal washing with clear water in a coal preparation plant can be achieved, and the dosage of medicament is reduced, thereby facilitating subsequent filtration dehydration treatment, improving circulating water utilization in the coal preparation plant, precluding coal slime water efflux and ore locus environment pollution and reducing loss and waste of coal resources; and compared with the cost by using the prior art, the total cost in the invention can be reduced by 15-50%. The method is simple and easy to implement.

Description

technical field [0001] The invention relates to a method for sedimentation and clarification of coal slime water in a coal preparation plant, especially suitable for highly muddy coal slime water difficult to settle, and also suitable for the treatment of industrial waste water with charged particles. Background technique [0002] The main reasons for the difficulty of settlement and clarification of highly muddy coal slime water in coal preparation plants are: [0003] 1. The surface of the fine slime particles in the slime water has a negative charge, and the electrostatic repulsion between the particles keeps the slime particles in a stable dispersed state; [0004] 2. The solvation of the surface of the fine particles in the slime water makes the surface of the particles form a "surrounding layer" of water molecules, and the surface of the particles with hydrophilic properties, even if the charge on the surface of the particles is eliminated, the particles will still be ...

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Problems solved by technology

[0005] 3. The fine mud circulates and accumulates in the circulating water, resulting in an increase in the concentration and viscosity of the clarified water

[0007] 1. Larger sedimentation area is required. Some large coal preparation plants often require multiple thickeners with a diameter of more than 45m, which occupy a large area;

[0008] 2. It needs to add coagulant and flocculant, the process is complex and the consumption of chemicals is large;

[0009] 3. The cost of slime water treatment is high, and a large amount of chemicals will be discharged from the system after acting on the coal slime and cannot be reused, resulting in high cost of slime water treatment

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