Method for producing potassium alum

A production method, the technology of potassium alum, applied in the direction of chemical instruments and methods, aluminum sulfur compounds, aluminum sulfate, etc., can solve the problems of polluting groundwater, occupying a large site, and high water content, achieving low energy consumption, reducing waste residue discharge, The effect of low production cost

Active Publication Date: 2015-04-01
广西北部湾粮油技术研究有限公司
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Problems solved by technology

Although the waste aluminum slag has been concentrated, its water content is still high, which not only oc

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  • Method for producing potassium alum

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Embodiment 1

[0037] A kind of production method of potassium alum, comprises following processing steps:

[0038] (1) Pulping process: Take the waste aluminum slag raw material, crush it into 80 mesh particle size, put it in the slurry tank, add water while stirring, and make the aluminum slag slurry of 30-40 Baume degrees;

[0039] (2) Aluminum sulfate crude liquid preparation process: first pump the aluminum slag slurry prepared in step (1) into the reactor, and then add concentrated sulfuric acid with a mass fraction of 98% that has been pumped into the high level barrel into the reactor , the weight of aluminum slag slurry and concentrated sulfuric acid is 1:1, close the reaction kettle, start the stirrer to stir, the stirring speed is 25 rpm, the time is 5 minutes, when the pressure in the reaction kettle is 0.3 ~ 0.4MPa, stop Stir and stand for 2 hours to obtain crude aluminum sulfate liquid; when the pressure in the reactor is 0.1MPa, discharge the crude aluminum sulfate liquid to t...

Embodiment 2

[0048] A kind of production method of potassium alum, comprises following processing steps:

[0049] (1) Pulping process: take waste aluminum slag raw material, crush it into 100 mesh particle size, put it in the slurry tank, add water while stirring, and make aluminum slag slurry with 30-40 Baume degrees;

[0050] (2) Aluminum sulfate crude liquid preparation process: first pump the aluminum slag slurry prepared in step (1) into the reactor, and then add concentrated sulfuric acid with a mass fraction of 98% that has been pumped into the high level tank into the reactor , the weight of aluminum slag slurry and concentrated sulfuric acid is 1:1, close the reaction kettle, start the stirrer to stir, the stirring speed is 20 rpm, the time is 35 minutes, when the pressure in the reaction kettle is 0.3 ~ 0.4MPa, stop Stir and stand for 2 hours to obtain crude aluminum sulfate liquid; when the pressure in the reactor is 0.1MPa, discharge the crude aluminum sulfate liquid to the set...

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Abstract

The invention discloses a method for producing potassium alum by utilizing industrial leftovers, namely waste aluminum residues. The method comprises the following steps: (1) preparing aluminum residue slurry by using the waste aluminum residues; (2) enabling the aluminum residue slurry to react with concentrated sulfuric acid so as to generate aluminum sulfate crude liquor; (3) performing settling separation on the aluminum sulfate crude liquor; (5) cooling and crystallizing the aluminum sulfate crude liquor; and (6) washing, airing and packaging, thereby obtaining the finished potassium alum product. According to the method disclosed by the invention, the waste aluminum residues are taken as raw material, the production cost is saved, the amount of waste residues is small, the additional benefits can be brought, and wastewater can be recycled; and moreover, the method is simple in process, convenient to operate, high in safety, low in energy consumption and low in production cost and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a production method of potassium alum, in particular to a method for preparing potassium alum from industrial leftovers—waste aluminum slag, and belongs to the technical field of chemical industry. Background technique [0002] Potassium alum, that is, potassium aluminum sulfate dodecahydrate, also known as alum, alum, potassium aluminum alum, potassium alum, is a double salt of potassium sulfate and aluminum sulfate containing crystal water, and its chemical formula is KAl(SO 4 ) 2 12H 2 O. Potassium Aluminum Sulfate is colorless crystal or powder, odorless, slightly sweet with astringent taste, and astringent; weathering in dry air loses crystal water, dissolves in moist air and drips water; easily soluble in glycerin and water , the aqueous solution is acidic, and aluminum hydroxide colloid precipitates after hydrolysis; at 200 ° C, 12 crystal waters are completely lost, and sulfur trioxide is decomposed at higher tempera...

Claims

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Application Information

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IPC IPC(8): C01F7/76
CPCC01F7/762
Inventor 张凤琼侯春生唐玲唐淑娟唐翔
Owner 广西北部湾粮油技术研究有限公司
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