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Method for improving filtering property of acid coal ash slurry

A filter performance, fly ash technology, applied in the field of fly ash resource utilization, to achieve the effect of stable chemical composition, convenient use, and easy degradation

Inactive Publication Date: 2014-03-19
鄂尔多斯市东源煤铝科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there is no research on how to improve the filtration performance of fly ash

Method used

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  • Method for improving filtering property of acid coal ash slurry
  • Method for improving filtering property of acid coal ash slurry
  • Method for improving filtering property of acid coal ash slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Taking fly ash 10% hydrochloric acid chemical iron removal slurry as an example, polyacrylamide (improved, cationic, molecular weight about 500,000 to 1,000,000) was used as flocculant, and 100mL1g L was prepared in advance －1For polyacrylamide solution, pipette 2.0mL and mix it with 300mL fly ash slurry at a speed of 300r·min -1 Stir at low temperature for 10s, and filter under the conditions that the filter medium is polypropylene (polypropylene, PP) acid-resistant filter cloth, the size is Φ100mm, the vacuum degree is 0.07MPa, and the temperature is 75-80°C. The effective filtration time is 19min46s without additives Shortened to 1min3s, the water content of the filter cake decreased from 61.3% without additives to 44.3%, and the chemical composition of the filtrate remained unchanged.

Embodiment 2

[0036] Taking the slurry chemically activated by 15% hydrochloric acid of fly ash as an example, polyacrylamide (improved, cationic, with a molecular weight of about 500,000 to 1,000,000) was used as a flocculant, and 100 mLg L was prepared in advance －1 For polyacrylamide solution, pipette 2.0mL and mix it with 300mL fly ash slurry at a speed of 300r·min -1 Stir at low temperature for 10s, and filter under the condition that the filter medium is polypropylene (polypropylene, PP) acid-resistant filter cloth, the size is Φ100mm, the vacuum degree is 0.07MPa, and the temperature is 55-60°C. The effective filtration time is 17min8s without adding flocculant Shortened to 1min18s, the water content of the filter cake was reduced from 60.2% without flocculant to 43.8%, and the chemical composition of the filtrate was stable.

[0037] Among them, the improvement of polyacrylamide is mainly through temperature or pH adjustment, dispersing machine, adding CO 2 Or polyethylene glycol a...

Embodiment 3

[0039] Taking fly ash chemically activated slurry with 7% sulfuric acid as an example, polyethylene glycol 4000 was used as surfactant, and 100mL2g L was prepared in advance －1 Polyethylene glycol solution, pipette 5.0mL, mix with 300mL fly ash slurry, at a speed of 300r min -1 Stir at low temperature for 10s, and filter under the conditions that the filter medium is polypropylene (polypropylene, PP) acid-resistant filter cloth, the size is Φ100mm, the vacuum degree is 0.07MPa, and the temperature is 55-60°C. The effective filtration time is 13min28s without additives Shortened to 56s, the water content of the filter cake was reduced from 55.6% without additives to 39.8%, and the chemical composition of the filtrate was stable.

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Abstract

The invention relates to a method for improving a filtering property of acid coal ash slurry. According to the method, the filtering property of the slurry is improved by adding filter aids, flocculating agents or surface active agents or a mixture of more than two types in a filtering process of the acid coal ash slurry, and the effective separation of the coal ash slurry can be realized. The method provided by the invention adopts multiple filter aids or addition agents, which are easily available and are easy to degrade (or resolve), the loss of coal ash dissolving / leaching elements (such as aluminum and iron) is not caused, other impurity elements are not introduced, the stabilization of a chemical constitution of original slurry is kept furthest, the use is convenient, the effect is good, the method is stable and reliable, and the industrialized popularization and application are realized.

Description

technical field [0001] The invention relates to the field of resource utilization of fly ash, especially the fields of fly ash acid chemical iron removal, fly ash acid chemical activation desiliconization, fly ash acid extraction of alumina, etc. Methods of filterability of ash slurries. Background technique [0002] As the most common fossil fuel, coal has always occupied the most important position in my country's energy structure. In recent years, with the rapid development of my country's economy, energy consumption, especially coal consumption, has increased year by year, and the emission of fly ash, which is a solid waste of coal combustion, has also increased year by year. At present, fly ash has become the largest single pollution source of industrial solid waste in China, and fly ash is seriously harmful to the environment and human body, mainly reflected in air pollution, water pollution, soil pollution, human health hazards, geological disasters, etc. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D37/02B01D37/03
Inventor 王思凯李会泉李勇辉王军喜李少鹏李泽锋贺实月马艳丽蒋海军
Owner 鄂尔多斯市东源煤铝科技有限公司
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