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Method for separating micro-fine kaolinite from coal slurry water

A technology of coal slime water and kaolinite, which is used in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, inorganic chemistry, etc. To improve the purity and added value of products, eliminate corrosion of production equipment, and eliminate the increase of coal slime ash

Active Publication Date: 2015-12-02
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: first, it requires a large sedimentation area, and large coal preparation plants usually require multiple thickeners with a diameter of more than 45m, and these devices occupy a large area; It is necessary to add coagulants and flocculants, the process is complicated; and the consumption of chemicals is large; the third is that the cost of coal slime water treatment is high, and the chemicals and slime are discharged out of the system after the action, which cannot be reused
This kind of coal slime water has high content of clay minerals such as kaolin and quartz, high content of fine particles, large consumption of treatment chemicals, high solid content of clarified water, and light transmittance is usually lower than 50%.
Even, the sedimentation and clarification treatment of coal slime water using the existing conventional technology is usually ineffective, resulting in the circulation and accumulation of fine slime in the circulating water, and the concentration and viscosity of the clarified water increase; also brought great difficulties
This situation not only affects the quality of coal products, but also affects the normal production of the entire system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The slime water concentration is 51g / L, the slime particles are less than 0.045mm, and the pH value of the slime water is 8.7. Take the slime water sample and dry it at 110°C to obtain the tested sample, analyze the tested sample by X-ray diffraction, and determine that the main mineral components in the tested sample are: quartz with a weight percentage content of 15.45%, and a weight percentage of Kaolinite with a content of 35.62%.

[0032] Using X-ray photoelectron spectrometer and X-ray fluorescence spectrometer to measure and analyze the interface properties of different mineral particles in coal slime water, it shows that the surface of kaolinite is mainly hydroxyl group, oxygen-containing functional group and C and other impurities. The simulated calculation by density functional theory shows that the dodecylamine surfactant has a good agglomeration effect on kaolinite particles.

[0033] Sodium pyrophosphate is selected as the dispersant, dodecylamine is selec...

Embodiment 2

[0036] Take the underflow of the second-stage thickener in a coal preparation plant and pass it through a 0.045mm sieve. The measured concentration of the slime water is 80g / L, and the pH value of the slime water is 8.4. Take the slime water sample and dry it at 110°C to obtain the tested sample, analyze the tested sample by X-ray diffraction, and determine that the main mineral components in the tested sample are: quartz with a weight percentage content of 16.47%, and a weight percentage content of Kaolinite is 31.56% and montmorillonite is 2.58% by weight.

[0037] Sodium hexametaphosphate and dodecyltrimethylammonium chloride are respectively prepared into an aqueous solution with a concentration of 20% by weight; the amount of sodium hexametaphosphate is determined to be 25g per cubic meter of coal slime water, and dodecyltrimethylammonium Ammonium chloride dosage is 18g per cubic meter of coal slime water;

[0038] First, add sodium hexametaphosphate to the coal slime wa...

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PUM

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Abstract

The invention discloses a method for separating micro-fine kaolinite from coal slurry water. The method comprises the following steps: a, determining main mineral components in the coal slurry water, and determining analyzing properties of boundaries of different mineral granules in the coal slurry water; b, establishing and optimizing a main mineral granule boundary model of the coal slurry water, and performing analog calculation analysis on different adsorption characteristics of different agents on surfaces of different mineral granules; c, selecting added agents according to analog calculation result, and determining the use amounts of added agents through tests; and d, adding agents into coal slurry water in sequence according to the use amounts, and sufficiently stirring and mixing so that micro-fine kaolinite granules in the coal slurry water are agglomerated and other mineral granules are dispersed, thereby separating micro-fine kaolinite from the coal slurry water. Due to selective regulation and control on boundaries of different mineral granules in coal slurry water, micro-fine kaolinite in coal slurry water can be separated through agglomeration, so that the purposes of resource utilization of kaolinite in coal slurry water and coal slurry water sedimentation promotion can be achieved.

Description

technical field [0001] The invention belongs to the field of waste water treatment and relates to a method for separating fine kaolinite from coal slime water. Background technique [0002] Kaolinite is the main clay mineral component in coal slime water of coal preparation plant, and in some coal slime water, the content is even as high as 60%. During the coal washing process, the kaolinite mineral particles will appear muddy and peel off, and then transform into fine kaolinite particles, making the slime water difficult to settle. These fine kaolinite particles have small particle size, are less affected by gravity, and are almost difficult to settle naturally; at the same time, the surface of fine kaolinite particles is charged with the same sex, and there is electrostatic repulsion between different particles. In addition, due to the solvation of the surface of the fine kaolinite particles, the surface of the particles forms a "surrounding layer" of water molecules, tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C01B33/40
Inventor 闵凡飞刘令云陆芳琴陈军彭陈亮李伟荣
Owner ANHUI UNIV OF SCI & TECH