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Method for aluminum chloride refining and calcium removal

A technology of aluminum chloride and sulfate, applied in the direction of aluminum chloride, aluminum halide, etc., can solve the problems affecting the purity of aluminum and difficulty, and achieve the effect of low cost, small waste liquid discharge, and single raw material input

Inactive Publication Date: 2017-01-04
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-alumina fly ash often contains many other oxide impurities that affect the purity of aluminum. It is difficult to effectively remove impurities, especially calcium with a high content.

Method used

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  • Method for aluminum chloride refining and calcium removal
  • Method for aluminum chloride refining and calcium removal
  • Method for aluminum chloride refining and calcium removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Dissolve 10g of high-alumina fly ash in 100mL of distilled water, and adjust its pH value to 1 with hydrochloric acid to obtain an acid dipping solution, in which the concentration of calcium ions is 5g / L.

[0021] 2. First add 1.95g of aluminum sulfate to 100mL of pickling solution, stir at 90°C for 45 minutes, then add 1.55g of aluminum sulfate, continue stirring at constant temperature for 45 minutes, and then suction filter the reaction solution while it is hot.

[0022] 3. Add the filtrate obtained after the suction filtration in step 2 into the HYA-300 chelating cation exchange resin column while it is hot for decalcification. The injection volume of the filtrate is 10 times the volume of the HYA-300 chelating cation exchange resin column. The injection flow rate was 2mL / min to obtain a high-purity aluminum chloride solution after calcium removal, in which the calcium ion concentration was 25.5mg / L.

Embodiment 2

[0024] 1. Dissolve 10g of high-alumina fly ash in 100mL of distilled water, and adjust its pH value to 1 with hydrochloric acid to obtain an acid dipping solution, in which the concentration of calcium ions is 5g / L.

[0025] 2. Add 3.5g of aluminum sulfate to 100mL of pickling solution, stir at 90°C for 90 minutes, and then suction filter the reaction solution while it is hot.

[0026] 3. Add the filtrate obtained after the suction filtration in step 2 into the HYC-300 chelating cation exchange resin column while it is hot for decalcification. The injection volume of the filtrate is 10 times the volume of the HYC-300 chelating cation exchange resin column. The injection flow rate was 2mL / min to obtain a high-purity aluminum chloride solution after calcium removal, in which the calcium ion concentration was 30.5mg / L.

Embodiment 3

[0028] 1. Dissolve 10g of high-alumina fly ash in 100mL of distilled water, and adjust its pH value to 2 with hydrochloric acid to obtain an acid dipping solution, wherein the concentration of calcium ions is 5g / L.

[0029] 2. First add 1.5g of aluminum sulfate to 100mL of pickling solution, stir at 90°C for 30 minutes, then add 1.2g of aluminum sulfate, continue stirring at constant temperature for 30 minutes, and then suction filter the reaction solution while it is hot.

[0030] 3. Add the filtrate obtained after the suction filtration in step 2 into the HYC-300 chelating cation exchange resin column while it is hot to remove calcium, and the injection volume of the filtrate is 4.5 times the volume of the HYC-300 chelating cation exchange resin column. The injection flow rate was 1.5mL / min to obtain a high-purity aluminum chloride solution after calcium removal, in which the concentration of calcium ions was 31mg / L.

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Abstract

The invention discloses a method for aluminum chloride refining and calcium removal. The method is mainly used for removing calcium ions in pickle liquor (pH =1 to 2) obtained after the sufficient reaction of high-aluminum fly ash and hydrochloric acid. According to the method, firstly, sulphate is used as a precipitant for removing impurities; the aluminum liquid subjected to impurity removal is continuously subjected to impurity removal by chelate cation exchange resin when being hot; finally, an effective calcium removal aluminum chloride solution is obtained. Compared with the prior art, the method has the advantages that the technical process is simple; the raw material addition is single; the consumption is low; other impurities cannot be introduced; the cost is low; the calcium removal effect is obvious; the method belongs to a fly ash refined integral utilization and calcium removal industrialization method with good prospects.

Description

technical field [0001] The invention belongs to the comprehensive resource utilization of fly ash, in particular to a method for refining and decalcifying aluminum chloride. Background technique [0002] With the development of the electric power industry, the amount of fly ash discharged from power plants increases accordingly. Fly ash is piled up in ash and discarded aside, which not only occupies a large amount of land, but also seriously pollutes the environment. The comprehensive utilization of fly ash can not only consume a large amount of fly ash, but also alleviate its pollution to the environment and reduce land occupation. [0003] The main component of fly ash is Al 2 o 3 and SiO 2 , containing a small amount of Fe 2 o 3 , FeO, CaO, MgO and other inorganic oxides, among which silicon and aluminum account for a high proportion, followed by calcium or iron. The composition of fly ash varies greatly in different regions and types, so the use effect of different...

Claims

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Application Information

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IPC IPC(8): C01F7/56C01F7/62
CPCC01F7/56C01F7/62C01P2006/80
Inventor 马红竹郭东前邓宁张华高梦凡林青雯武敏李文韵
Owner SHAANXI NORMAL UNIV
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