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Method of removing arsenic from arsenic-containing nickel sulfate solution

A technology of nickel solution and arsenic sulfuric acid, applied in the direction of nickel sulfate, etc., can solve problems such as nickel loss, achieve the effect of reducing loss, low cost, and improving the removal effect of arsenic

Active Publication Date: 2017-07-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is operated under the premise that tungstate is greatly excessive relative to arsenic, and the inventors found that if this method is used to remove arsenic in nickel sulfate solution, a large amount of nickel will be lost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Prepare 1L of nickel sulfate solution containing 60g / L of nickel and 500mg / L of arsenic (AR grade is selected for nickel sulfate and arsenic acid, and distilled water is used for water); adjust its pH to 2 with dilute sulfuric acid; The molar ratio of tungsten and tungsten is 1:9; dissolve the weighed sodium tungstate in 1L of mixed solution, place it in a constant temperature water bath at 25°C, and stir rapidly to make it react evenly; pass the solution through The D301 anion resin exchange column detects the arsenic in the above-mentioned ion-exchanged solution. The content of arsenic is 0.22ppm, the loss of nickel in the solution is 2‰, and the recovery rate of tungsten is 99.5%. Then, the exchanged D301 anion resin is washed with distilled water having the same pH as the ion-exchanged solution until the washing solution is colorless. Then use a mixed solution of 2mol / L NaCl and 0.4mol / L NaOH (nNaCl:nNaOH=5:1) to desorb the washed resin, so that the arsenic and tungs...

Embodiment 2

[0033] Prepare 1L of nickel sulfate solution containing 100g / L of nickel and 140mg / L of arsenic (AR grade is selected for nickel sulfate and arsenic acid, and distilled water is used for water); use dilute sulfuric acid to adjust its pH to 0.7; according to the content of arsenic in the solution, use arsenic The molar ratio of tungsten and tungsten is 1:10. Dissolve the weighed sodium tungstate in 1L of mixed solution, place it in a constant temperature water bath at 25°C, and stir rapidly to make it react evenly; pass the solution through D314 anion exchange column, the resin desorption after exchange, the separation of tungsten and arsenic, and the recovery of tungsten are the same as in Example 1.

[0034] The arsenic in the solution after ion exchange was detected, the arsenic content was 0.15ppm, the loss of nickel in the solution was 2‰, and the recovery rate of tungsten was 99.2%.

Embodiment 3

[0036] Prepare 1L of nickel sulfate solution containing 20g / L nickel and 40mg / L arsenic (arsenic acid is AR grade, distilled water is used for water); use dilute sulfuric acid to adjust its pH to 1.9; With a ratio of 1:12, dissolve the weighed sodium tungstate in 1L of the mixed solution, place it in a constant temperature water bath at 25°C, and stir rapidly to make it react evenly; pass the solution through D301 anion exchange Column; resin desorption, separation of tungsten and arsenic, and recovery of tungsten are the same as in Example 1.

[0037] The content of arsenic in the solution after ion exchange is 0.032ppm, the loss of nickel in the solution is 2‰, and the recovery rate of tungsten is 99.9%.

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PUM

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Abstract

A method of removing arsenic from an arsenic-containing nickel sulfate solution comprises the steps of adding sodium tungstate or sodium molybdate into the arsenic-containing nickel sulfate solution (pH less than or equal to 2) at a molar ratio of arsenic to tungsten or molybdenum of 1:(9-12) for reaction to form a heteropoly acid containing solution, and injecting the solution into an exchange column equipped with large-aperture anion resin to form a solution after ion exchange and the large-aperture anion resin absorbing heteropoly acid. Raw materials used in a whole process can be recycled. A tungstate ion or molybdate anion loss is small (less than or equal to 0.5%); an arsenic content of the final solution after the exchange is less than 0.5 ppm; and industrial production requirements are completely met.

Description

technical field [0001] The invention belongs to the technical field of industrial metallurgy, and in particular relates to a method for removing arsenic in an industrial nickel sulfate solution. Background technique [0002] In the process of industrial production, arsenic is one of the most common impurity elements, which not only affects the extraction and recovery of other valuable metals, but also causes environmental pollution due to the production of various arsenic wastewater or waste. So how to remove arsenic in various environments (including wastewater, non-ferrous metal smelting process, etc.) has become a hot research issue. [0003] At present, according to reports at home and abroad, the measures for removing arsenic from wastewater can be summarized as reverse osmosis, biological method, precipitation method, extraction / ion exchange method, etc. Due to the large investment and large area occupied by the extraction method in the actual production process, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/10
CPCC01G53/10
Inventor 陈爱良霍广生赵中伟钱振李孟春陈星宇刘旭恒李江涛
Owner CENT SOUTH UNIV
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