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Method for improving filtering property of alkaline coal ash slurry

A technology of filtration performance and fly ash, applied in the field of fly ash resource utilization, to achieve the effects of convenient use, good effect and various types

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

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Taking fly ash 15% sodium hydroxide slurry to extract silica as an example, diatomite (chemical composition is SiO 2 =80%~94%, Al 2 o 3 =3%~6%, Fe 2 o 3 =1%~3%, CaO=1%~3%, MgO=0.5%~1.5%) as filter aid, prepare 300mL1% ash suspension in advance, filter, and form a pre-coat on the filter medium; pipette 10mL diatomite suspension, mixed with 300mL fly ash slurry, at a speed of 300r min -1Stir at high temperature for 5 minutes, and filter under the condition that the filter medium is nylon (nylon 66, polyamide fiber, PA) alkali-resistant filter cloth, the size is Φ100mm, the vacuum degree is 0.07MPa, and the temperature is 80-90°C. The 3min56s of adding filter aid is shortened to 55s, the water content of filter cake is reduced from 38.3% without adding filter aid to 32.5%, and the chemical composition of filtrate is stable.

Embodiment 2

[0033] Take fly ash 50% sodium hydroxide slurry to extract alumina as an example, ash slag (boiler cinder, chemical composition is SiO 2 =30%~45%, Al 2 o 3 =30%~45%, Fe 2 o 3 =2%~5%, TiO 2 =2%~5%, CaO=2%~5%, MgO=1%~3%, Weiran carbon C=2%~10%) as filter aid, prepare 300mL1% ash suspension in advance, filter, and in Form a pre-coat on the filter medium, pipette 10mL ash suspension, mix with 300mL fly ash slurry, the filter medium is nylon (nylon 66, polyamide fiber, PA) alkali-resistant filter cloth, the size is Φ100mm, vacuum Filtration under the condition of 0.07MPa and temperature of 180-220℃, the effective filtration time is shortened from 7min12s without filter aid to 1min28s, and the water content of filter cake is reduced from 41.7% without filter aid to 35.8%. The chemical composition of the filtrate remained essentially unchanged.

Embodiment 3

[0035] Taking the slurry of fly ash 50% sodium hydroxide to extract alumina as an example, polyacrylamide (commercially available, cationic, molecular weight about 5 million) was used as an auxiliary agent, and 100mL of 0.1% polyacrylamide solution was prepared in advance, and 5.0 mL, mixed with 300mL fly ash slurry, at a speed of 300r·min -1 Stir at low temperature for 20s, and filter under the condition that the filter medium is nylon (nylon 66, polyamide fiber, PA) alkali-resistant filter cloth, the size is Φ100mm, the vacuum degree is 0.07MPa, and the temperature is 180-220°C. The 7min12s of adding additives was shortened to 1min57s, the water content of the filter cake was reduced from 41.7% without adding additives to 36.9%, 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 alkaline 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 alkaline 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 extracting silica with low-concentration lye from fly ash and extracting alumina with high-concentration lye from fly ash. Method for filtering properties. 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, the environme...

Claims

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Application Information

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IPC IPC(8): B01D37/02B01D37/03
Inventor 李会泉王思凯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