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Method for producing aluminum polychlorid water purifying agent from waste hydrochloric acid and aluminum ash

A technology of polyaluminum chloride and waste hydrochloric acid, applied in the fields of aluminum chloride, chemical instruments and methods, aluminum halide, etc., can solve problems such as aluminum ash pollution, achieve the effect of ensuring stability and promoting rapid production

Inactive Publication Date: 2017-06-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for producing polyaluminum chloride water purifying agent by using waste hydrochloric acid and aluminum ash, using the waste liquid and solid waste aluminum ash produced by acid treatment of high-aluminum fly ash as raw materials to produce polyaluminum chloride Aluminum water purifier, this method can not only solve the pollution problems of acid waste liquid discharge and aluminum ash, but also realize the synergistic utilization of aluminum ash and acid-containing wastewater and the utilization of aluminum resources, and can be prepared in accordance with national standards (GB15892-2009) The polyaluminum chloride product required by the index has good economic and social value

Method used

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  • Method for producing aluminum polychlorid water purifying agent from waste hydrochloric acid and aluminum ash

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Experimental program
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Effect test

Embodiment 1

[0037] Add a certain amount of industrial hydrochloric acid to the waste hydrochloric acid solution until the hydrogen ion concentration is 3g / l, wash the aluminum ash three times with tap water, and put the aluminum ash into the prepared waste hydrochloric acid solution according to the liquid-solid ratio of 10ml / g , reacted at 80°C for 1.5h, and separated the liquid and solid after the reaction to obtain an aluminum-containing solution; added calcium carbonate to the aluminum-containing solution in two batches, and carried out a polymerization reaction until all the calcium carbonate was dissolved and the pH value of the solution was 3 ~5; then aged in a water bath at 60°C for 10 hours to obtain a polyaluminum chloride water purifier.

[0038] The aluminum oxide content of the prepared polyaluminum chloride water purifying agent is 12.3%, and the basicity is 78.4%.

Embodiment 2

[0040] Add a certain amount of industrial hydrochloric acid to the hydrogen ion concentration in the waste hydrochloric acid solution to be 3g / l, wash the aluminum ash with tap water 3 times, and put the aluminum ash into the prepared waste acid at a liquid-solid ratio of 20ml / g. React at 80°C for 1.5 hours. After the reaction is completed, liquid-solid separation is carried out to obtain an aluminum-containing solution; calcium carbonate is added to the aluminum-containing solution in two batches, and the polymerization reaction is carried out until the calcium carbonate is completely dissolved and the pH value of the solution is 3~ 5; then aging in a water bath at 60°C for 10 hours to obtain a polyaluminum chloride water purifier.

[0041] The prepared polyaluminum chloride water purifying agent has an alumina content of 10% and a basicity of 62.8%.

Embodiment 3

[0043] Add a certain amount of industrial hydrochloric acid to the hydrogen ion concentration in the waste hydrochloric acid solution to be 3g / l, wash the aluminum ash with tap water 3 times, and put the aluminum ash into the prepared waste acid at a liquid-solid ratio of 10ml / g. React at 90°C for 1.5 hours, and carry out liquid-solid separation at the end of the reaction to obtain an aluminum-containing solution; add calcium carbonate to the aluminum-containing solution in two batches, and perform a polymerization reaction until all the calcium carbonate is dissolved and the pH value of the solution is 3~ 5; then aging in a water bath at 60°C for 10 hours to obtain a polyaluminum chloride water purifier.

[0044] The aluminum oxide content of the prepared polyaluminum chloride water purifier is 10.1%, and the basicity is 88%.

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Abstract

The invention relates to a method for producing an aluminum polychlorid water purifying agent from waste hydrochloric acid and aluminum ash. The method comprises the following steps: carrying out dissolving reaction on the solid waste aluminum ash produced in an aluminum electrolysis process and waste hydrochloric acid produced in a resource utilization process of high-aluminum coal ash, so as to obtain an aluminum-containing solution; adding alkaline salt or alkali into the aluminum-containing solution, and carrying out polymerization reaction, so as to obtain a primary product; and ageing the primary product, so as to obtain an aluminum polychlorid liquid product. By utilizing the method, the problems of solid waste pollution and wastewater emission can be solved, and the aluminum polychlorid product meeting the index requirements of national standard (GB15892-2009) can be prepared; and the method has good economic and social values.

Description

technical field [0001] The invention relates to a method for preparing a water purifying agent, in particular to a method for producing a polyaluminum chloride flocculant by using waste hydrochloric acid and aluminum ash. Background technique [0002] High-alumina fly ash is a solid waste produced by burning high-alumina coal in thermal power plants in central Inner Mongolia and northern Shanxi. It contains a large amount of resources such as alumina and silica, and the utilization rate of existing resources is low. The high aluminum fly ash used not only pollutes the environment but also causes a huge waste of resources. At present, the resource utilization of high-alumina fly ash mainly focuses on the extraction of alumina. Alkaline and acid processes are the main processes for extracting alumina from high-alumina fly ash, and the acid process will produce a large amount of acid-containing waste liquid, which is difficult deal with. [0003] Aluminum ash is the product o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C02F1/52
CPCC01F7/56C01P2006/80C02F1/5236
Inventor 李会泉李占兵李少鹏张建波孙振华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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