Hydrophobic agglomeration, sedimentation and clarification method for slime water

A slime water and hydrophobic technology, which is applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of high cost of slime water treatment, difficulty in dehydration and pressure filtration, and increased viscosity of slime, etc. problems, to achieve the effect of eliminating corrosion of production equipment, reducing resource consumption, and reducing viscosity

Inactive Publication Date: 2015-01-07
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The coal slime water used in the test was taken from the concentrated feed of a thermal coal preparation plant in Huainan mining area. The coal slime water concentration was 10 g / L and the pH was 8.7. The specific steps of the embodiment are as follows:

[0022] 1. Since the pH of coal slime water is 8.6, it is not necessary to adjust it within the reasonable range of the test;

[0023] 2. Select quaternary ammonium salt octadecyl trimethyl ammonium chloride (1831) as the surface hydrophobic active agent, and use deionized water to prepare it into an aqueous solution with a mass fraction of 0.5%;

[0024] 3. Measure 500ml of well-stirred slime water and put it into a 1000ml large beaker, add 1831 with a dry slime amount of 2000g / t to the beaker with the prepared 1831 aqueous solution, and immediately use an electronic stirrer at 750r / min. Stir at the stirring speed for 10 minutes, then place it in a 500ml graduated cylinder to settle for 20 minutes, record the descendi...

Embodiment 2

[0027] The coal slurry water used in the test was taken from the concentrated feed of a thermal coal preparation plant in Huainan mining area. The specific steps of the embodiment are as follows:

[0028] 1. Since the pH of coal slime water is 8.6, it is not necessary to adjust it within the reasonable range of the test;

[0029] 2. The selected agents are quaternary ammonium salt surface hydrophobic active agent octadecyl trimethyl ammonium chloride (1831) and flocculant anionic polyacrylamide (APAM), respectively prepared with deionized water to a mass fraction of 0.5% and 0.1% aqueous solution is used;

[0030] 3. Measure 500ml of well-stirred coal slime water and put it into a 1000ml large beaker, add a certain amount of 1831 and APAM at the same time, immediately stir with an electronic stirrer at a stirring speed of 750r / min for 10min, and then place it in a 500ml measuring cylinder for natural Settling for 20 minutes, recording the descending distance of the clarifica...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/56
CPCC02F1/547C02F1/56
Inventor 陈军闵凡飞刘令云彭陈亮刘春福杜佳
Owner ANHUI UNIV OF SCI & TECH
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