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Method for reducing and removing metal impurities from ammonium molybdate solution by using ion exchange resin

A technology for ion exchange resins and metal impurities, applied in chemical instruments and methods, molybdenum compounds, inorganic chemistry, etc., can solve the problems of resin ion exchange performance adverse effects, loss of adsorption, etc., to achieve easy desorption regeneration, reduce impurities removal Effects of cost reduction and reduction of running time

Inactive Publication Date: 2013-11-27
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ammonium molybdate solution contains a large amount of ammonium ions, which will adversely affect the ion exchange performance of the resin, and because the ammonium molybdate solution is alkaline, metal ions such as Al and Zn can no longer exist as free metal ions , causing the cation exchange resin to lose its adsorption effect. Therefore, for the ammonium molybdate solution, the use of cation exchange resin for impurity removal treatment requires special treatment methods and process conditions

Method used

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  • Method for reducing and removing metal impurities from ammonium molybdate solution by using ion exchange resin
  • Method for reducing and removing metal impurities from ammonium molybdate solution by using ion exchange resin
  • Method for reducing and removing metal impurities from ammonium molybdate solution by using ion exchange resin

Examples

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Effect test

Embodiment 1

[0030] Amberlite IRC-84 type weakly acidic acrylic cation exchange resin produced in the United States, 732 type strongly acidic styrene type cation exchange resin produced by Zhejiang Zhengguang Resin Company, and D168 type weakly acidic phenolic cation exchange resin produced by Shanghai Jinyang Resin Company were selected. Add three times the resin volume and 5% ammonia water to the three resins for soaking and rinsing. The treatment time is 1 hour. Resin transformation treatment.

[0031] Take a certain amount of ammonium molybdate purification solution, add nitric acid with a mass concentration of 50% dropwise under stirring conditions, and adjust its pH value to close to 5.

[0032] The transformed Amberlite IRC-84, 732 and D168 cation exchange resins were loaded into the exchange columns in turn, the ratio of the filling height to the diameter of the exchange column was 10:1, and then the three exchange columns were connected in series in sequence, and the molybdic acid...

Embodiment 2

[0039] Amberlite IRC-72 weakly acidic acrylic cation exchange resin produced in the United States, Diaion SK-IA strong acidic styrene cation exchange resin produced in Japan, and D126 weakly acidic phenolic cation exchange resin produced by Shanghai Jinkai Resin Company were selected. , respectively add 5 times the volume of the resin and 10% ammonia water to the three resins for soaking and rinsing. The treatment time is 3 hours. Realize the transformation process of resin.

[0040] Take a certain amount of ammonium molybdate purification solution, add nitric acid with a mass concentration of 60% dropwise under stirring conditions, and adjust its pH value to close to 7.

[0041] The transformation-treated Amberlite IRC-72, Diaion SK-IA and D126 cation exchange resins were loaded into the exchange columns in turn, and the ratio of the filling height to the diameter of the exchange column was 20:1, and then the three exchange columns were connected in series. Add the ammonium ...

Embodiment 3

[0048] Duolite C-464 weakly acidic acrylic cation exchange resin produced in France, Amberlite IR-120 strongly acidic styrene cation exchange resin produced in the United States, and D155 weakly acidic phenolic cation exchange resin produced by Zibo Dongda Resin Company were selected. , respectively add 4 times the volume of the resin and ammonia water with a mass concentration of 7% to the three resins for soaking and rinsing. The treatment time is 2 hours. Realize the transformation process of resin.

[0049] Take a certain amount of ammonium molybdate purification solution, add nitric acid with a mass concentration of 55% dropwise under stirring conditions, and adjust its pH value to close to 6.

[0050] The transformation-treated Duolite C-464, Amberlite IR-120 and D155 cation exchange resins were loaded into the exchange columns in turn, and the ratio of the filling height to the diameter of the exchange column was 15:1, and then the three exchange columns were connected ...

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Abstract

The invention discloses a method for reducing and removing metal impurities from ammonium molybdate solution by using ion exchange resin, relating to the deep purification technology of the ammonium molybdate solution in chemical industry field. The method comprises the following steps: firstly selecting three suitable cationic exchange resins according to the kinds and contents of the impurities metal ions in a molybdenic acid solution; adopting ammonium water to implement transamination treatment for the resins, and putting the resins in the ion exchange columns which are serially connected according to a certain order; regulating the to-be-treated ammonium molybdate solution to be weakly acidic with nitric acid, and leading the treated ammonium molybdate solution through serially connected ion exchange columns in turnat a certain speed for implementing ion exchange treatment; and adopting the ammonium water to adjust the ammonium molybdate exchange processing liquid subjected to columns treatment to alkalescence after the exchange treatment is finished. The method can uniformly reduce the concentration of the impurities metal ions in the ammonium molybdate solution to be lower than 3 ppm, and the metal ions comprise calcium, magnesium, aluminum, zinc, ferrum, nickel, copper, cadmium, chromium, manganese, bismuth and plumbum; and the method cannot change the components and the concentration of the ammonium molybdate solution. The ion exchange resins can be reused, so that the operation cost can be efficiency reduced, and the continuous impurity removing production in large-scale can be realized.

Description

technical field [0001] The invention relates to a deep purification technology of an ammonium molybdate solution in the chemical industry, in particular to a method for removing metal impurities in the ammonium molybdate solution by using an ion exchange resin. Background technique [0002] Ammonium molybdate is a typical isopolyacid salt of ammonium cations and different types of molybdate anions. Since the form of molybdate ion in the solution changes with the acidity, concentration, temperature and other factors of the solution, the molybdate in the solution is not a stable, single anion, and the ammonium molybdate crystal crystallized from the ammonium molybdate solution , due to the different preparation conditions, its phases are diversified. At present, solid ammonium molybdate mainly includes ammonium monomolybdate, ammonium dimolybdate, ammonium tetramolybdate, ammonium heptamolybdate, ammonium octamolybdate, ammonium dodecamolybdate and beta-type ammonium molybdat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G39/00
Inventor 张军郭彦辉卢伟伟宋帮才许明臣郭红波
Owner HENAN UNIV OF SCI & TECH
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