Hydrophobic agglomeration, sedimentation and clarification method for slime water

Abstract

The invention discloses a hydrophobic agglomeration, sedimentation and clarification method for slime water, and the method is applicable to slime water treatment in a coal preparation plant. The hydrophobic agglomeration, sedimentation and clarification method comprises the following steps: measuring concentration of the slime water, regulating the pH value of the slime water to a reasonable range; adding a cationic hydrophobic surfactant into the slime water, mixing the cationic hydrophobic surfactant with slime water to enable the surfaces of coal slime particles to be subjected to hydrophobization sufficiently by the hydrophobic surfactant so as to form a hydrophobic agglomerate; naturally sedimentating the pretreated slime water, detecting concentration of solid particles in clarified water, and if the concentration of the clarified water is larger than 1 g / L, adding an anionic flocculant until the concentration of the clarified water is smaller than 1 g / L. By adopting the hydrophobic agglomeration, sedimentation and clarification method, coal in the coal preparation plant can be cleaned by clear water, subsequent filter pressing and dewatering on coal slime can be easily performed, the coal slime recycling rate and the utilization ratio of recycled water are increased, and outward discharge of the slime water and mining area pollution are avoided; the hydrophobic agglomeration, sedimentation and clarification method is simple and convenient 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, in particular, it is suitable for sedimentation and clarification of coal slime water with high mud content and difficult sedimentation. Background technique [0002] The main reasons for the difficulty of sedimentation and clarification of high-slimed coal slime water in coal preparation plants: (1) The increase in the degree of mechanical coal mining leads to the large content of fine-grained slime particles in the coal slurry water, the small quality of fine particles, and the dispersibility in the coal slurry suspension system. (2) The quality of raw coal deteriorates, resulting in a high content of clay minerals in the slime water. The clay minerals have stable dispersibility and are easily sludged into fine particles, which greatly increases the settlement difficulty of the slime water; (3) Coal slime The surface of the particles...

AI Technical Summary

Problems solved by technology

This traditional slime water clarification treatment process often has the following disadvantages: (1) it needs to add coagulants and flocculants, the process is complicated, and the consumption of chemicals is large; After the slime is discharged from the system, it cannot be reused, resulting in high cost of slime water treatment; (3) The viscosity of the slime after the polymer flocculant treatment increases sharply, which brings great difficulties to the subsequent dehydration and pressure filtration