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Method for recycling reduction coal from coal slime

A coal slime and magnetic separation technology, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of insignificant reduction of coal slime ash content and difficulty in obtaining ash content, so as to improve the comprehensive utilization rate and improve the quality , The effect of saving the cost of medicine

Inactive Publication Date: 2015-06-24
深圳市华天顿能源环保技术有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies of the coal slime separation technology in the prior art, and to provide a method for recovering reduced coal from coal slime by combining magnetic separation-flotation-chemical treatment technology, aiming at solving the problem of existing simple flotation It is difficult to obtain coal concentrate products with an ash content below 5% by the separation technology, and the technical problem that only using magnetic separation technology to treat the coal slime has no significant effect on reducing the ash content of the coal slime

Method used

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  • Method for recycling reduction coal from coal slime
  • Method for recycling reduction coal from coal slime
  • Method for recycling reduction coal from coal slime

Examples

Experimental program
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Effect test

Embodiment 1

[0039] In this example, a certain coal slime in Yunnan with an ash content of 55.6%, a total sulfur content of 0.85% and a fixed carbon of 28.6% is used as the raw material, and the process of recovering the reduced coal is as follows: image 3 The specific steps are as follows:

[0040] S11: First add water to slurry the above-mentioned coal slime, use a high-frequency vibrating screen for classification, and then ball mill the coarse particles, and then enter the next process together with the fine particles. Ingredients account for 90%;

[0041] S12: First perform weak magnetic separation on the pulp obtained in step S11, the magnetic induction intensity is 0.08T, to obtain iron concentrate and weak magnetic tailings with an iron content greater than 60%; and then perform strong magnetic separation on the weak magnetic tailings , the magnetic induction intensity is 1.0T, and the magnetic separation concentrate and magnetic separation tailings are obtained;

[0042] S13: T...

Embodiment 2

[0045] In this embodiment, a certain coal slime with an ash content of 49.8% and a sulfur content of 0.97% in Hebei is used as the raw material, and the process of recovering the reduced coal from it is as follows: Figure 4 The specific steps are as follows:

[0046] S21: First add water to slurry the above-mentioned coal slime, use a cyclone for classification, and then ball mill the coarse particles to control the slurry concentration of 40% and the slurry fineness of -0.075mm to account for 70% of the ingredients. The ball mill discharges and fine particles Go to the next step together;

[0047] S22: send the ore pulp obtained in step S21 into a strong magnetic separator for magnetic separation, the magnetic induction intensity is 0.9T, and then introduce the magnetic separation tailings into the thickening device, and control the discharge concentration to be 25%;

[0048] S23: Introduce the ore pulp obtained in step S22 into the mixing tank, add flotation reagents, and ...

Embodiment 3

[0051] In the present embodiment, the coal slime with a certain ash content of 47.8% and a total sulfur content of 1.22% in Shanxi is used as a raw material, and the concrete steps of recovering the reduced coal are as follows:

[0052] S31: First add water to slurry the above-mentioned coal slime, use a cyclone for classification, and then enter the coarse particles into the wet ball mill and enter the next process together with the fine particles, and control the composition of the slurry concentration of 32% and the pulp fineness of -0.075mm 78%;

[0053] S32: introduce the ore pulp obtained in step S31 into a strong magnetic magnetic separator for magnetic separation, the magnetic induction intensity is 1.8T, then the magnetic separation concentrate is post-processed to recover valuable components, and the magnetic separation tailings enter the next process;

[0054] S33: The magnetic separation tailings obtained in step S32 are introduced into the thickening device, and t...

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Abstract

The invention provides a method for recycling reduction coal from coal slime. The method includes: adding water into the coal slime for pulpify treatment and obtaining pulp whose concentration is 20-30%; conducting grading ball milling to enable the grains whose grain size is less than 0.074mm to take up 50% of the content of the pulp; conducting the magnetic separation on the pulp after the ball milling and obtaining the magnetic concentration and the magnetic tailings; adding water into the magnetic tailings for the pulpify treatment, adding the floatation reagent for the floatation treatment and obtaining the floatation coal concentrate and the floatation coal tailings; conducting the acid treatment on the floatation coal concentrate and conducting agitation leach for 0.2-4.0 hours; and adding the flocculating agent for flocculation and settlement, conducting filtering and obtaining the reduction coal. The ash content of the reduction coal is less than or equal to 5%, and the sulphur content is less than and equal to 0.1%. The method for recycling the reduction coal from the coal slime compositely uses the technology of magnetic separation-flocculation-chemical treatment so that advanced reduction coal products with the low ash content and suphur content can be obtained.

Description

technical field [0001] The invention belongs to the technical field of coal slime separation and treatment, in particular to a method for recovering reduced coal from coal slime. Background technique [0002] Coal slime is a by-product after coal washing in a coal washing plant. Due to its relatively high ash, sulfur and moisture content, it is difficult to be used directly, and even if it is used, it is difficult to obtain good economic benefits. With the improvement of coal mining mechanization in my country, the deterioration of resource geological conditions, the large-scale construction of coal preparation plants and the wide application of heavy medium separation technology, the proportion of high-ash refractory coal slime has increased sharply, and continues to deteriorate, making coal The contradiction of sludge separation is more prominent, resulting in the continuous increase of ash content of flotation clean coal and the gradual decrease of recovery rate, which ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00
CPCB03B7/00
Inventor 符剑刚欧阳征国陈凯达顿晋萍
Owner 深圳市华天顿能源环保技术有限公司
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