Alcoholization removing method of impurity iron in aluminum sulfate solution

A technology of aluminum sulfate and low-iron aluminum sulfate, applied in the direction of aluminum sulfate, aluminum sulfur compounds, etc., can solve the problems of harsh operating conditions, complicated process, high energy consumption, etc., and achieve the effect of low cost, simple operation, and low energy consumption

Inactive Publication Date: 2012-07-25
内蒙古昶泰资源循环再生利用科技开发有限责任公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The disadvantages of the aforementioned methods are that the recrystallization method is labor-intensive and consumes a lot of energy; both the chemical precipitation method and the solvent extraction method have complex processes, harsh operating conditions, many types of chemicals involved, high energy consumption, and high investment in production equipment. Large and other shortcomings, it is difficult to popularize and apply in the current industrial production at home and abroad

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  • Alcoholization removing method of impurity iron in aluminum sulfate solution
  • Alcoholization removing method of impurity iron in aluminum sulfate solution

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Effect test

Embodiment 1

[0026] Embodiment 1: the aluminum sulfate solution that will contain sulfuric acid with sulfuric acid leaching fly ash is evaporated and concentrated at 100 ℃ to become the aluminum sulfate concentrated solution that concentration is 40%, cooling, according to the volume ratio of ethanol and aluminum sulfate concentrated solution is 1: 1 Add absolute ethanol, stir thoroughly for 2 hours, and obtain an aluminum sulfate filter cake after filtering; according to the mass ratio of aluminum sulfate filter cake and water as 1:2, add water to dissolve the filter cake, continue to add ethanol, and control the volume of ethanol in the mixed solution system The fraction is 50%, stir well for 2 hours, dissolve the ferric sulfate in it, and precipitate aluminum sulfate, and obtain aluminum sulfate filter cake after filtration. Repeat the above-mentioned alcoholization and iron removal process 3 times to remove iron impurities to the maximum extent, and finally obtain a low-iron aluminum su...

Embodiment 2

[0028] Embodiment 2: the aluminum sulfate solution containing sulfuric acid that will be leached bauxite with sulfuric acid is evaporated and concentrated at 110 ℃ to become the aluminum sulfate concentrated solution that concentration is 50%, cooling, according to the volume ratio of ethanol and aluminum sulfate concentrated solution is 1.5: 1 Add absolute ethanol, stir thoroughly for 2 hours, and obtain an aluminum sulfate filter cake after filtering; according to the mass ratio of aluminum sulfate filter cake and water as 1:2, add water to dissolve the filter cake, continue to add ethanol, and control the volume of ethanol in the mixed solution system The fraction is 60%, stir well for 2 hours, dissolve the ferric sulfate, and precipitate aluminum sulfate, and filter to obtain aluminum sulfate filter cake. Repeat the above-mentioned alcoholization and iron removal process 4 times to remove iron impurities to the maximum extent, and finally obtain a low-iron aluminum sulfate ...

Embodiment 3

[0030] Embodiment 3: the aluminum sulfate solution containing sulfuric acid that will be leached coal gangue with sulfuric acid is evaporated and concentrated at 100 ℃ to become the aluminum sulfate concentrated solution that concentration is 45%, cooling, according to the volume ratio of ethanol and aluminum sulfate concentrated solution is 3: 1 Add absolute ethanol, stir thoroughly for 3 hours, and filter to obtain an aluminum sulfate filter cake; according to the mass ratio of aluminum sulfate filter cake and water as 1:2, add water to dissolve the filter cake, continue to add ethanol, and control the volume fraction of ethanol in the mixed solution system 75%, fully stirred for 2 hours, dissolved the ferric sulfate, and precipitated aluminum sulfate, filtered to obtain aluminum sulfate filter cake. Repeat the above-mentioned alcoholization and iron removal process 4 times to remove iron impurities to the maximum extent, and finally obtain a low-iron aluminum sulfate filter ...

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Abstract

The invention discloses an alcoholization removing method of impurity iron in aluminum sulfate solution. The method comprises the following steps: concentrating aluminum sulfate solution, alcoholizing with organic alcohol to remove iron, dewatering aluminum sulfate, and drying to obtain high-purity and low-iron aluminum sulfate of which iron content is less than 20ppm, wherein the product meets the technical requirements of industrial aluminium sulfate in HG / T2225-2001. For the aluminum sulfate solution with sulfuric acid, after the concentrated solution is obtained in the concentration process and is cooled, a working procedure of organic alcohol alcoholization pickling is required to be added. The invention has the advantages that the technology is simple, the process flow is short, theproduction process is easy to control, the iron-removing efficiency is high, the production cost is low, the impurity content of the product is low, the quality is stable and pollutions are not generated; and the invention is convenient for popularization and application.

Description

technical field [0001] The invention relates to a method for removing impurity iron, in particular to an alcoholic removal method for impurity iron in an aluminum sulfate solution. Background technique [0002] A common process for producing aluminum sulfate is to use bauxite, kaolin, clay, coal gangue, fly ash, etc. as raw materials, and leaching with sulfuric acid to obtain an aluminum sulfate solution containing impurities, the main impurity of which is iron ions. The level of iron content determines the quality and use of aluminum sulfate products to a large extent. Low iron aluminum sulfate is used in the treatment of industrial wastewater and domestic sewage, papermaking, leather tanning, wood preservation, post-treatment of titanium dioxide, high-grade paper and catalyst carrier and other industries have a wide range of uses. [0003] The methods for removing impurity iron from aluminum sulfate solution mainly include recrystallization method, chemical precipitation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/74
Inventor 余红发武金永吴成友麻海燕王梅娟董金美李颖李成栋
Owner 内蒙古昶泰资源循环再生利用科技开发有限责任公司
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