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Method for removing impurity iron in aluminum sulfate solution through ion exchange

A technology of ion exchange and cation exchange, applied in the field of ion exchange removal of impurity iron in aluminum sulfate solution, can solve the problems of large investment in production equipment, complicated process, high energy consumption, etc., and achieve high iron removal efficiency, simple operation, and simple process Effect

Inactive Publication Date: 2012-08-15
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 disadvantages
Using the aforementioned methods to remove impurity iron in the aluminum sulfate solution, it is difficult to achieve the ultra-high purity requirement that the Fe content is less than 1ppm

Method used

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  • Method for removing impurity iron in aluminum sulfate solution through ion exchange
  • Method for removing impurity iron in aluminum sulfate solution through ion exchange

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Effect test

Embodiment 1

[0029] Embodiment 1: the thick aluminum sulfate solution that concentration is 30%~60%, is adjusted to pH value 1~3 with sulfuric acid, is pressed into the resin column that D001 macroporous cationic resin is housed with corrosion-resistant pump and carries out iron removal, The treatment temperature is 65° C., and the flow rate of the crude aluminum sulfate solution is 4 times the resin volume / h during treatment to obtain a low-iron aluminum sulfate solution.

[0030] After the adsorption and saturation of the macroporous cationic resin, the adsorption capacity of the resin is recovered through elution and regeneration. The elution conditions are: the eluent adopts hydrochloric acid with a concentration of 10%, the elution temperature is 50° C., and the flow rate of hydrochloric acid is 1 times the resin volume / h, a total of 2 times the resin volume of hydrochloric acid was used for elution; the concentration of 10% hydrochloric acid was used for regeneration, the temperature ...

Embodiment 2

[0033] Embodiment 2: the aluminum sulfate thick liquid that concentration is 30%, is adjusted to pH value 1 with sulfuric acid, is pressed into the resin column that JK008 macroporous cationic resin is housed with corrosion-resistant pump and carries out iron removal, and treatment temperature is 90 ℃ , the flow rate of the crude aluminum sulfate solution is 2 times the resin volume / h during processing, and a low-iron aluminum sulfate solution is obtained.

[0034]When the macroporous cationic resin is adsorbed and saturated, the resin can recover its adsorption capacity through elution and regeneration. The elution conditions are as follows: the eluent adopts hydrochloric acid with a concentration of 8%, the elution temperature is 30° C., and the flow rate of hydrochloric acid is 2 times the resin volume / h, a total of 1 times the resin volume of hydrochloric acid was used for elution; the concentration of 8% hydrochloric acid was used for regeneration, the temperature was 20°C...

Embodiment 3

[0037] Embodiment 3: the thick aluminum sulfate solution that concentration is 40%, is adjusted to pH value 2 with sulfuric acid, is pressed into the resin post that SPC-1 macroporous cationic resin is housed with corrosion-resistant pump and carries out deironing, and processing temperature is 70°C, the flow rate of the crude aluminum sulfate solution is 3 times the resin volume / h during treatment, and a low-iron aluminum sulfate solution is obtained.

[0038] When the macroporous cationic resin is adsorbed and saturated, the resin is eluted and regenerated to restore its adsorption capacity. The elution conditions are: water is used as the eluent, the elution temperature is 60°C, and the water flow rate is 1 times the resin volume / h , a total of 3 times the resin volume of water was used for elution; a concentration of 6% hydrochloric acid was used for regeneration, the temperature was 50°C, and the flow rate of hydrochloric acid was 3 times the resin volume / h, and a total of...

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Abstract

The invention discloses a method for removing impurity iron in an aluminum sulfate solution through ion exchange, which comprises the steps of: adsorbing iron with resin, concentrating a low-iron aluminum sulfate solution, alcoholizing with organic alcohol for acid washing, dehydrating and drying aluminum sulfate to obtain the superhigh-purity aluminum sulfate with Fe content lower than 0.2ppm. The method has the advantages of simple process, short flow, easily controlled production process, high iron removal rate, low production cost, low product impurity content, stable quality and no pollution, and is convenient for popularization and application.

Description

technical field [0001] The invention relates to an ion exchange removal method, in particular to an ion exchange removal method for impurity iron in an aluminum sulfate solution. Background technique [0002] The 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 is iron ions. The level largely determines the quality and use of aluminum sulfate products. Low-iron aluminum sulfate is widely used in drinking water, industrial wastewater and domestic sewage treatment, papermaking, leather tanning, wood preservation, titanium dioxide post-treatment, high-grade paper and catalyst carrier and other industries. If the purity of aluminum sulfate is further improved to prepare ultra-high-purity aluminum sulfate, it will become an important raw material for the manufacture of ultra-high-purity alumina,...

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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