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A dewatering and drying process of tailings coal slurry

A technology of coal slurry and tailings, applied in dehydration/drying/concentrated sludge treatment, water/sludge/sewage treatment, sludge treatment, etc., can solve high water content, reduce resource utilization rate, unfavorable environmental protection, etc. problems, achieve the effects of reducing water content, improving resource utilization, and good fluidity

Inactive Publication Date: 2019-12-13
曲靖市沾益区龙鑫资源回收有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of extracting clean coal by flotation, a large amount of flotation waste tailings coal slurry will be produced, and because the water content of these tailings coal slurry is extremely high, it is difficult to dehydrate and reuse. Therefore, the existing tailings The coal slurry is directly discharged to waste or wet to the tailings pond after being treated up to the standard, relying on the liquid collection pool under the dam of the tailings pond for self-purification reaction, but as time goes by, it will follow the indicators that affect the flotation process, At the same time, it is not conducive to environmental protection and reduces the utilization rate of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The tailings coal slurry dehydration and drying process is mainly used to recycle and reuse the waste tailings coal slurry produced after extracting clean coal from coal slime after dehydration and drying, mainly including the following steps:

[0024] Pump the waste tailings coal slurry produced after the coal slime extracts clean coal into the container, add 0.1% by weight polyacrylamide, then control the stirring rate to 200r / min, and continue stirring for 7 minutes to ensure that the coal slurry and polyacrylamide The acrylamide is fully mixed and reacted, and at the same time, through the centrifugal force of the stirring, the resulting flocs and water molecules can be better separated. While stirring, the tailings coal slurry in the container is vibrated at the same time, and the frequency of the vibration is controlled to 10Hz, so that the resonance effect can be generated between the same molecules, so that the flocs and water molecules can be better separated. ...

Embodiment 2

[0028] The tailings coal slurry dehydration and drying process is mainly used to recycle and reuse the waste tailings coal slurry produced after extracting clean coal from coal slime after dehydration and drying, mainly including the following steps:

[0029] Pump the waste tailings coal slurry generated after the coal slime extracts clean coal into the container, add 0.3% by weight polyacrylamide, then control the stirring rate to 300r / min, and keep stirring for 3min to ensure that the coal slurry and polyacrylamide The acrylamide is fully mixed and reacted, and at the same time, through the centrifugal force of the stirring, the resulting flocs and water molecules can be better separated. While stirring, the tailings coal slurry in the container is vibrated at the same time, and the vibration frequency is controlled to 15Hz, so that the resonance effect can be generated between the same molecules, so that the flocs and water molecules can be better separated. , to further re...

Embodiment 3

[0033] The tailings coal slurry dehydration and drying process is mainly used to recycle and reuse the waste tailings coal slurry produced after extracting clean coal from coal slime after dehydration and drying, mainly including the following steps:

[0034] Pump the waste tailings coal slurry produced after the coal slime extracts clean coal into the container, add 0.15% by weight polyacrylamide, then control the stirring rate to 270r / min, and keep stirring for 4min to ensure that the coal slurry and polyacrylamide The acrylamide is fully mixed and reacted, and at the same time, through the centrifugal force of the stirring, the resulting flocs and water molecules can be better separated. While stirring, the tailings coal slurry in the container is vibrated at the same time, and the vibration frequency is controlled to 12Hz, so that the resonance effect can be generated between the same molecules, so that the flocs and water molecules can be better separated. , to further re...

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PUM

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Abstract

The invention provides a dehydration press-drying method of mine tailing coal slurry, and belongs to the technical field of resource recycling. The dehydration press-drying method is used for solving a problem in the prior art that dehydration and recycling of waste mine tailing coal slurry are difficult to realize. The dehydration press-drying method comprises following steps: mine tailing coal slurry obtained via extraction of cleaned coal from coal slime is pumped into a container, and polyacrylamide is added for uniform stirring; aluminum sulfate is added into obtained processed mine tailing coal slurry, an obtained mixture is stirred to be uniform, and is allowed to stand for precipitation; after precipitation, an obtained precipitate is delivered into a pressure filter using a high pressure pump, and is subjected to press drying so as to obtain filter cake, wherein the pressure of the pressure filter is controlled to be 1.5 to 3MPa. According to the dehydration press-drying method, cooperation of the steps is capable of realizing recycling of mine tailing coal slurry, the water content of the obtained filter cake is 23% or lower, the filter cake can be used for preparing bricks directly, and resource utilization rate is increased.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, and relates to a tailings coal slurry dehydration and drying process. Background technique [0002] At present, my country's coal washing process is mainly jigging-flotation combined process, dense medium-flotation combined process and jigging-dense medium-flotation combined process. These washing processes generally produce about 15% coal slime. [0003] Coal slime is a viscous substance composed of fine-grained coal, pulverized bone stone and water. It has the characteristics of fine particle size, high particle content, high moisture and ash content, low calorific value, strong cohesiveness and strong cohesion. Due to its relatively high ash, sulfur and moisture content, it is difficult to be directly used, and even if it is used, it is difficult to obtain good economic benefits. It has been rejected by power users for a long time. Therefore, the waste coal slime of coal preparation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/127C02F11/147C02F11/143
CPCC02F11/122C02F11/14
Inventor 阮吉明阮吉富阮宇浩阮吉君阮海定阮吉荣
Owner 曲靖市沾益区龙鑫资源回收有限公司