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Method for removing metal ion impurities in aluminium chloride solution by multistage resin columns

A technology of resin column and aluminum chloride is applied in the field of multi-stage resin column processing aluminum chloride solution to remove iron, calcium and magnesium ions, and can solve the problems of inappropriate large-scale production, no impurity removal method, complicated process and the like, To achieve the effect of good impurity removal, easy control of production process and simple process

Active Publication Date: 2013-09-11
CHINA SHENHUA ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is complex in process, inconvenient to operate, and high in cost, and because it is necessary to add acid for acid dissolution before adding alkali to remove impurities, so as to fully dissolve alkali metal ions such as iron, calcium, and magnesium in the aluminum chloride solution, chlorine The higher the content of alkali metal ions such as iron, calcium, and magnesium in aluminum chloride raw materials, the greater the alkali consumption, and the less suitable for large-scale production. Therefore, in actual production, this method is more effective for iron, calcium, magnesium, etc. content has certain requirements
At present, there is no suitable impurity removal method for aluminum chloride solutions with relatively high content of impurity metal ions such as iron, calcium, and magnesium.

Method used

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  • Method for removing metal ion impurities in aluminium chloride solution by multistage resin columns
  • Method for removing metal ion impurities in aluminium chloride solution by multistage resin columns
  • Method for removing metal ion impurities in aluminium chloride solution by multistage resin columns

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Embodiment 1

[0045] Contains 95 grams / liter of aluminum (calculated as alumina), 1.4 grams / liter of iron (calculated as iron oxide), 1.7 grams / liter of calcium (calculated as calcium oxide), and 1.1 grams / liter of magnesium (calculated as magnesium oxide) Measure) the aluminum chloride solution, adjust the pH value to 1.5 with hydrochloric acid solution, heat the temperature to 69°C, and press it into such as figure 1 In the multistage resin column group shown, wherein resin column 11, 12 and 13 are equipped with D001 type cation exchange resin, resin column 14, 15 and 16 are equipped with D401 type chelating resin, the resin loading capacity in each resin column 20ml respectively, and the diameter-to-height ratio of each resin column is 0.6:1. The aluminum chloride solution is processed by a downstream column method, and the incoming flow rate of the aluminum chloride solution is 40ml / hour.

[0046] After the impurity removal treatment, the obtained refined aluminum chloride solution was...

Embodiment 2

[0049] Contains 85 g / L of aluminum (calculated as alumina), 1.8 g / L of iron (calculated as iron oxide), 1.3 g / L of calcium (calculated as calcium oxide), and 1.4 g / L of magnesium (calculated as magnesium oxide) Calculate the aluminum chloride solution, adjust the pH value to 1.3 with hydrochloric acid solution, heat the temperature to 73°C, and press it into such as figure 2 In the shown multi-stage resin column group, the resin columns 21, 22 and 23 are equipped with 732 type cation exchange resin, and the resin columns 24, 25 and 26 are equipped with D402 type chelating resin. The diameter-to-height ratio of resin columns 21 and 24 is 1.8:1, and the resin loading capacity is 40 ml respectively; the diameter-height ratio of resin columns 22, 23, 25 and 26 is 0.6:1, and the resin loading capacity is 20 ml respectively. The aluminum chloride solution is processed by passing through the column method in parallel, and the incoming flow rate of the aluminum chloride solution is 6...

Embodiment 3

[0053] Contains 88 grams / liter of aluminum (calculated as alumina), 2.7 grams / liter of iron (calculated as iron oxide), 1.5 grams / liter of calcium (calculated as calcium oxide), and 1.2 grams / liter of magnesium (calculated as magnesium oxide) Calculate the aluminum chloride solution, adjust the pH value to 1.3 with hydrochloric acid solution, heat the temperature to 73°C, and press it into such as image 3 In the multi-stage resin column group shown, wherein resin columns 31, 32, 33, 34, 35, 36 and 37 are equipped with 7020H type cation exchange resin, and resin columns 38, 39 and 40 are equipped with D403 type chelating resin. The diameter-to-height ratio of resin columns 31, 32, 33, 34, 35, 36, 37, 39 and 40 is 0.6:1, and the resin loading capacity is 20ml respectively; the diameter-height ratio of resin column 38 is 1.8:1, and the resin loading capacity 40ml;. The aluminum chloride solution is processed by passing through the column method in parallel, and the incoming flo...

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Abstract

The invention discloses a method for removing metal ion impurities in an aluminium chloride solution by multistage resin columns. The invention discloses a method for removing iron impurity ions, calcium impurity ions and magnesium impurity ions in the aluminium chloride solution. The method comprises the following steps of: adjusting the pH of the aluminium chloride solution to be 0.1-3.5, and then sequentially enabling the aluminium chloride solution to pass through a strong acid-type cation exchange resin column group and a chelate resin column group, wherein the cation exchange resin column group and the chelate resin column group comprise at least two stages respectively, and each stage comprises 1-4 parallel resin columns. The method disclosed by the invention is simple in process, easy to control production process, stable in product quality, good in impurity removal effect, and capable of adopting a high treatment flow speed, thus improving the production efficiency.

Description

technical field [0001] The invention relates to a method for treating aluminum chloride solution to remove metal ion impurities contained therein, in particular to a method for treating aluminum chloride solution by adopting a multistage resin column to remove iron, calcium and magnesium ions. Background technique [0002] Aluminum chloride solution is an important liquid raw material for industrial production of polyaluminum chloride, basic aluminum chloride and crystalline aluminum chloride. In the process of industrial production of aluminum chloride solution, such as when the fly ash acid method is used to prepare alumina solution, due to the lack of purity of the fly ash raw material and equipment pollution, the prepared aluminum chloride solution usually contains a certain amount of Iron, calcium, magnesium and other impurities. When such aluminum chloride solution is used to prepare industrial products such as polyaluminum chloride, basic aluminum chloride or crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/62
Inventor 郭昭华池君洲王永旺董宏姬学良张云峰高桂梅刘大锐高志娟松丽涛
Owner CHINA SHENHUA ENERGY CO LTD
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