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Method for preparing flocculant aluminum polychlorid by utilizing coal ash

A technology of polyaluminum chloride and fly ash, which is applied in the fields of aluminum chloride, aluminum halide, flocculation/sedimentation water/sewage treatment, etc. It can solve problems such as long mechanical grinding time, low extraction rate of aluminum and iron, and complicated process. Achieve the effect of low cost, improved reactivity, and simple operation

Active Publication Date: 2018-01-26
唐山中絮工业水处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research results show that the physical activation operation is simple, but the mechanical grinding time is long, and the extraction rate of aluminum and iron is low
The process of limestone sintering method in chemical activation is complicated, and the fluoride aiding method is very effective, but it is limited due to the pollution of fluoride ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of method utilizing fly ash to prepare flocculant polyaluminum chloride comprises the steps:

[0041] (1) Grind and sieve the fly ash, then use sodium hydroxide solution (the concentration of hydroxide ion is 2mol / L) for 8 minutes at 50°C and 350W for ultrasonic treatment, separate solid and liquid, wash until neutral, and dry to obtain alkali Treated fly ash;

[0042] (2) Mix the fly ash after alkali treatment in step (1), composite sodium additive and water, activate with 700W microwave for 8 minutes, dry, pulverize, and sieve to obtain preactivated fly ash; wherein, the composite sodium additive It is a mixture of sodium carbonate, sodium chloride and sodium sulfate, the mass ratio of sodium carbonate, sodium chloride and sodium sulfate is 4:1:1; the mass ratio of fly ash, compound sodium additive and water is 1:1.2: 3;

[0043] (3) calcining and activating the preactivated fly ash prepared in step (2) at 820° C. for 1.3 h, pulverizing and sieving to obtain ...

Embodiment 2

[0047] A kind of method utilizing fly ash to prepare flocculant polyaluminum chloride comprises the steps:

[0048] (1) Grind and sieve fly ash, then use sodium carbonate solution (with a hydroxide ion concentration of 1.5 mol / L) for 10 minutes of ultrasonic treatment at 60°C and 400W, separate solid and liquid, wash until neutral, and dry to obtain alkali Treated fly ash;

[0049] (2) Mix the fly ash after the alkali treatment in step (1), the composite sodium additive and water, activate with 800W microwave for 5 minutes, dry, pulverize, and sieve to obtain pre-activated fly ash; wherein, the composite sodium additive It is a mixture of sodium carbonate, sodium chloride and sodium sulfate, the mass ratio of sodium carbonate, sodium chloride and sodium sulfate is 4:0.5:1; the mass ratio of fly ash, compound sodium additive and water is 1:1: 2;

[0050] (3) calcining and activating the pre-activated fly ash prepared in step (2) at 800° C. for 1.5 h, pulverizing and sieving t...

Embodiment 3

[0054] A kind of method utilizing fly ash to prepare flocculant polyaluminum chloride comprises the steps:

[0055] (1) Grind and sieve the fly ash, then use sodium hydroxide solution (the concentration of hydroxide ion is 3mol / L) to ultrasonically treat for 5min at 40°C and 300W, separate the solid from the liquid, wash until neutral, and dry to obtain the alkali Treated fly ash;

[0056] (2) Mix the fly ash after the alkali treatment in step (1), the composite sodium additive and water, activate with 600W microwave for 10 minutes, dry, pulverize, and sieve to obtain pre-activated fly ash; wherein, the composite sodium additive It is a mixture of sodium carbonate, sodium chloride and sodium sulfate, the mass ratio of sodium carbonate, sodium chloride and sodium sulfate is 4:1.5:1; the mass ratio of fly ash, composite sodium additive and water is 1:1.5: 4;

[0057] (3) calcining and activating the pre-activated fly ash prepared in step (2) at 850° C. for 1.2 h, pulverizing a...

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Abstract

The invention belongs to the technical field of flocculant production and specifically relates to a method for preparing flocculant aluminum polychlorid by utilizing coal ash. The method for preparingflocculant aluminum polychlorid by utilizing coal ash comprises the following steps: grinding and sieving the coal ash and using aqueous alkali for ultrasonically treating; mixing the coal ash treated with alkali, compound sodium additive and water and then activating with microwave, thereby acquiring pre-activated coal ash; calcinating and activating the pre-activated coal ash under high temperature, thereby acquiring the secondary pre-activated coal ash; performing acid leaching and high-temperature high-pressure acid solution on the secondary pre-activated coal ash, and then using calciumaluminate mineral powder for regulating the basicity, thereby acquiring the aluminum polychlorid. The method provided by the invention is simple in operation and low in cost, is suitable for industrial production, utilizes the coal ash as the raw material and is capable of turning waste into wealth, reducing the production cost and avoiding the environmental pollution caused by the waste coal ashsolid.

Description

technical field [0001] The invention belongs to the technical field of flocculant production, and in particular relates to a method for preparing flocculant polyaluminium chloride by using fly ash. Background technique [0002] Fly ash is a solid waste produced after coal combustion, and its main chemical components mainly include Al 2 o 3 , Fe 2 o 3 , SiO 2 , CaO, K 2 O et al. Among them, Al 2 o 3 The content is about 15-40%, SiO 2 The content is about 34-66%. It is a typical aluminosilicate mineral. In addition, there are traces of Ge, Ga, U, Ni, Pt and other rare elements in fly ash. Fly ash is mostly off-white to black, from which we can see the level of carbon content. The particle size of fly ash particles is between 0.5 μm and 300 μm. It is a porous material with a large specific surface area and good adsorption activity. [0003] About 98% of my country's coal utilization is achieved through combustion, and a large amount of fly ash is produced during the ...

Claims

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Application Information

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IPC IPC(8): C01F7/56C02F1/52
Inventor 孟青
Owner 唐山中絮工业水处理有限公司
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