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Methods for removing calcium and magnesium alkaline-earth metal ions contained in chromate solution by adopting ion exchange resin

An ion exchange resin, ion exchange technology, applied in the direction of ion exchange, ion exchange regeneration, ion exchange bed cleaning/flushing, etc., to achieve the effect of mild process conditions, simple operation and easy regeneration

Inactive Publication Date: 2010-09-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japanese published patent (flat 2-107526) introduces a refining method for sodium chromate solution, but it can only reduce calcium and magnesium to 0.4ppm at most

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The DA460 styrene aminophosphoric acid ion exchange resin produced by Shandong Dongda Chemical Group was used to remove calcium and magnesium from potassium chromate solution. Its technological process is:

[0027] a. First use an excess of 0.3g / L of K 2 CO 3 With excess 0.01g / LKOH solution, most of the multivalent metal ions in the 250g / L potassium chromate solution are removed, and then the potassium chromate solution is filtered in a 0.4 micron filter;

[0028] b. The pH value of the potassium chromate solution is not adjusted;

[0029] c. Potassium chromate solution is passed through the column height with the speed of 5ml / min from the bottom to be 35cm, and the diameter is the ion exchange column that 1.82cm is equipped with DA460 ion exchange resin;

[0030] d. There is a water circulation heating jacket outside the ion exchange column, so that the temperature is 65°C. The calcium and magnesium ions in the potassium chromate solution were reduced from the init...

Embodiment 2

[0032] Calcium and magnesium were removed from sodium chromate solution by using TP207 styrene iminodiacetic acid ion exchange resin produced by German Bayer company. Its technological process is:

[0033] a. First use excess 0.2g / LNa 2 CO 3 With excess 0.008g / LNaOH solution, most of the multivalent metal ions in the 200g / L sodium chromate solution are removed, and then the sodium chromate solution is filtered in a 0.2 micron filter;

[0034] b. Adjust the pH value to 9.5;

[0035] c. The sodium chromate solution is passed through the column height at a speed of 2ml / min from the bottom to be 20cm, and the diameter is 1.68cm. The ion-exchange column that TP207 ion-exchange resin is housed;

[0036] d. There is a water circulation heating jacket outside the ion exchange column, so that the temperature is 50°C. The calcium and magnesium ions in the sodium chromate solution were reduced from the initial 9mg / L and 4mg / L to 0.112mg / L and 0.109mg / L respectively. The adsorbed and...

Embodiment 3

[0038] Amberlite IRC 748 styrene iminodiacetic acid ion exchange resin produced by American Rohman and Haas Company was used to remove calcium and magnesium from potassium chromate solution. Its technological process is:

[0039] a. Use an excess of 0.5g / LK first 2 CO 3 And excess 0.012g / LKOH solution removes most of the polyvalent metal ions in the 450g / L potassium chromate solution, and then the potassium chromate solution is filtered in a 0.4 micron filter;

[0040]b. The pH value of the potassium chromate solution is not adjusted;

[0041] c. Potassium chromate solution is passed through the column height at the speed of 1ml / min from the top to be 25cm, and the diameter is 1.68cm to be equipped with the ion-exchange column of 748 ion-exchange resin;

[0042] d. There is a water circulation heating jacket outside the ion exchange column, so that the temperature is 50°C. The calcium and magnesium ions in the potassium chromate solution were reduced from the initial 10mg / ...

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Abstract

The invention relates to a method for removing calcium and magnesium alkaline-earth metal ions contained in a chromate solution by adopting ion exchange resin, belonging to the technical field of refining of the chromate solution. A process course comprises the following steps of: adding a chemical refined preparation to remove a large majority of impurities; filtering suspended matters contained in the suspended matter by using a filter to obtain a chromate solution with suspended matter content less than 1 mg / L; dynamically contacting the obtained chromate solution with the ion exchange resin to carry out ion exchange; and diluting or concentrating the obtained chromate solution to prepare a feed solution suitable for electrolysis. The invention has the advantages that the chromate solution containing obviously reduced calcium and magnesium can be obtained and is very suitable for being used as the feed solution of chromate synthesized into dichromate till chromic anhydride through electrocatalysis; and the ion exchange resin saturated by adsorption can be repeatedly used by being washed, regenerated and transformed; and in addition, the method has the advantages of moderate process condition, easy operation, little pollution, low cost and easy resin regeneration, and can realize the continuous large-scale production.

Description

technical field [0001] The invention belongs to the technical field of refining chromate solution, and specifically relates to a method for removing calcium and magnesium alkaline earth metal ions in chromate solution by using ion exchange resin, and the refined solution is suitable for electrocatalytic synthesis of heavy chromium as chromate Salt until the raw material solution of chromic anhydride. Background technique [0002] Chromic anhydride is referred to as chromic anhydride, and its molecular formula is: CrO 3 , is an important chromium chemical product, a strong oxidizing agent, easily deliquescent, soluble in water, highly corrosive, and toxic. Among the chromium salt products, chromic anhydride accounts for 60% of the total output, which is mainly used for the preparation of water-soluble wood preservative chromium copper arsenate, followed by metal finishing, catalyst preparation, chromium trioxide and magnetic material chromium dioxide And used as oxidant, mo...

Claims

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Application Information

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IPC IPC(8): C01G37/14B01D15/04B01J49/00B01J49/53B01J49/60
Inventor 余志辉齐涛曲景奎王丽娜初景龙
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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