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A kind of production method of ammonium alum

A production method, the technology of ammonium 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 reducing the amount of waste residue

Active Publication Date: 2016-05-18
广西北部湾粮油技术研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the waste aluminum slag has been concentrated, its water content is still high, which not only occupies a large amount of space, but also pollutes the groundwater body and causes harm to the environment.

Method used

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  • A kind of production method of ammonium alum

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Experimental program
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Effect test

Embodiment 1

[0044] A kind of production method of ammonium alum, comprises following processing step:

[0045] (1) Pulping process: take the waste aluminum slag raw material with an alumina content of 20-60%, grind it into a particle size of 80 mesh, put it in the slurry tank, and stir while adding water to obtain 30-40 Baume Aluminum slag slurry;

[0046] (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 ratio 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, and the time is 5 minutes. When the pressure in the reaction kettle is 0.3~0.4MPa, Stop stirring, leave standstill for 2 hours, make aluminum sulfate thick liquid;

[0047] (3) Aluminum sulfate crude liquid sediment...

Embodiment 2

[0055] A kind of production method of ammonium alum, comprises following processing step:

[0056] (1) Pulping process: Take the waste aluminum slag raw material with an alumina content of 20-60%, grind it into a particle size of 100 mesh, put it in the slurry tank, and stir while adding water to obtain 30-40 Baume Aluminum slag slurry;

[0057] (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 ratio of aluminum slag slurry and concentrated sulfuric acid is 1:1, close the reactor, start the stirrer to stir, the stirring speed is 20 rpm, and the time is 35 minutes. When the pressure in the reactor is 0.3~0.4MPa, Stop stirring, leave standstill for 2 hours, make aluminum sulfate thick liquid;

[0058] (3) Aluminum sulfate crude liquid sedimentation and sepa...

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Abstract

The invention discloses a method for producing an aluminum ammonium sulfate crystal from an industrial waste (aluminum residue). The method for producing the aluminum ammonium sulfate from aluminum residue comprises the following steps: (1) preparing an aluminum residue slurry from aluminum residue; (2) enabling the aluminum residue slurry to react with concentrated sulfuric acid to generate a crude aluminum sulfate solution; (3) precipitating to separate the crude aluminum sulfate solution; (4) enabling aluminum sulfate to react with aluminum sulfate to generate a crude aluminum ammonium sulfate solution; (5) cooling to crystallize the crude aluminum ammonium sulfate solution; and (6) washing the aluminum ammonium sulfate crystal with water, airing, and packaging to obtain the finished product of aluminum ammonium sulfate. Because aluminum residue is used as the raw material to produce the aluminum ammonium sulfate crystal, the production cost can be reduced. A small amount of aluminum residue is used, but an additional benefit can be achieved. The wastewater can be recycled. The process for producing the aluminum ammonium sulfate crystal is simple, is convenient to operate, is highly safe, is low in production cost, consumes less energy and is suitable of large-scale production.

Description

technical field [0001] The invention relates to a production method of ammonium alum, in particular to a method for preparing ammonium alum from industrial leftovers—waste aluminum slag, and belongs to the technical field of chemical industry. Background technique [0002] Ammonium alum, that is, aluminum ammonium sulfate dodecahydrate, also known as aluminum ammonium alum, ammonium alum and gem alum, the molecular formula is NH 4 Al(SO 4 ) 2 12H 2 O, is colorless crystal, white granule or powder, tastes slightly sweet and astringent; loses 10 molecules of crystallization water at 120°C, loses crystallization water at 250°C and becomes white powder, that is, burns alum, decomposes at 280°C, and Release ammonia gas; soluble in water, dilute acid, glycerin, insoluble in ethanol; density 1.64g / cm 3 , melting point 94.5 ° C, refractive index 1.459. [0003] Ammonium alum has a wide range of uses. It can be used as a buffer and leavening agent for food-grade products, as a c...

Claims

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Application Information

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