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Method for removing arsenic from nickel sulfate solution

A technology of nickel sulfate solution, which is applied in the field of industrial metallurgy, can solve the problems of loss of main metal elements, reduction of arsenic adsorption, etc., and achieve the effect of reducing dosage and improving conversion rate

Active Publication Date: 2017-08-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this adsorbent is only suitable for treating sewage, and cannot be used in metallurgical industrial production, because ferric ions will also adsorb the main metal, which will result in a decrease in the adsorption of arsenic and a loss of a large amount of main metal elements.

Method used

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  • Method for removing arsenic from nickel sulfate solution
  • Method for removing arsenic from nickel sulfate solution
  • Method for removing arsenic from nickel sulfate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Prepare 1L of nickel sulfate solution containing nickel 60g / L and arsenic (pentavalent) 50mg / L (AR grade nickel sulfate and arsenic acid, distilled water for water); (25°C) by WO 4 2 type resin, the WO 4 2 The type resin is obtained through the transformation of D301 type anion resin, and the arsenic in the above-mentioned ion-exchanged liquid is detected; then the exchanged D301 anion resin is rinsed with 0.2mol / L dilute sulfuric acid for nickel, and then the resin is washed to medium with distilled water. , and then use 0.1mol / L sodium hydroxide and 0.5mol / L sodium sulfide mixed solution to carry out arsenic removal treatment on the cleaned resin, so that arsenic is detached from the resin and enters the desorption solution, and the desorption solution is measured.

[0046] The concentration of arsenic in the solution after exchange is 0.142ppm, and the loss rate of tungsten is 0.0034%.

Embodiment 2

[0048] Prepare 1L of nickel sulfate solution containing 80g / L nickel and 50mg / L arsenic (pentavalent) (AR grade nickel sulfate and arsenic acid, distilled water for water); (40℃) by WO 4 2 type resin, the WO 4 2 The type resin is obtained through the transformation of D201 anion resin, and the arsenic in the above-mentioned ion-exchanged solution is detected; then the exchanged D201 anion resin is rinsed with 0.2mol / L dilute sulfuric acid for nickel, and then the resin is washed with distilled water until it is neutral. , and then use 0.1mol / L sodium hydroxide and 0.5mol / L sodium sulfide mixed solution to carry out arsenic removal treatment on the cleaned resin, so that arsenic is separated from the resin and enters the desorption solution, and the desorption solution is measured.

[0049] The concentration of arsenic in the solution after exchange is 0.216ppm, and the loss rate of tungsten is 0.0042%.

Embodiment 3

[0051] Prepare 1L of nickel sulfate solution containing 40g / L of nickel and 100mg / L of arsenic (pentavalent) (nickel sulfate and arsenic acid are of AR grade, and distilled water is used for water); (25°C) through MoO 4 2 type resin, the MoO 4 2 The type resin is obtained through the transformation of D301 anion resin, and the arsenic in the above-mentioned ion-exchanged solution is detected; then the exchanged D301 anion resin is rinsed with 0.2mol / L dilute sulfuric acid for nickel, and then the resin is washed with distilled water until it is neutral. , and then use 0.1mol / L sodium hydroxide and 0.5mol / L sodium sulfide mixed solution to carry out arsenic removal treatment on the cleaned resin, so that arsenic is separated from the resin and enters the desorption solution, and the desorption solution is measured.

[0052] The concentration of arsenic in the liquid after exchange is 0.194ppm, and the loss rate of molybdenum is 0.0016%.

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Abstract

The invention relates to a method for removing arsenic from a nickel sulfate solution, in particular to a method for removing arsenic in an industrial nickel sulfate solution by means of modified large-aperture anion resin. The method comprises the following steps that Cl<-> type large-aperture anion resin is converted into OH<-> type large-aperture anion resin, and then OH<-> type large-aperture anion resin is converted into WO4<2-> type or MoO4<2-> type large-aperture anion resin; the nickel sulfate solution passes through a WO4<2-> type or MoO4<2-> type resin column, and the purpose of removing arsenic is achieved by utilizing functional groups (WO4<2-> or MoO4<2->) on the resin and pentavalent arsenic in the solution to form heteropolyacid; according to the resin achieving adsorption, adsorbed arsenic is washed with dilute sulfuric acid, the resin is washed to be neutral with distilled water, desorption is conducted with a low-concentration mixed solution of sodium hydroxide and sodium sulfide, the resin is washed to be neutral, and then resin regeneration is achieved. According to the method for removing arsenic from the nickel sulfate solution, raw materials used in the whole process can be recycled, losses of tungstate and molybdate ions do not exist, and the arsenic content of the finally obtained exchanged solution is below 0.5 ppm and completely meets the industrial production requirement.

Description

technical field [0001] The invention belongs to the technical field of industrial metallurgy, and relates to a method for removing arsenic from nickel sulfate solution, in particular to a method for removing arsenic in industrial nickel sulfate solution by using a modified large-aperture anion resin. 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, the arsenic removal technologies at home and abroad can be mainly summarized as biological method, vulcanization method, coagulation method, ion exchange method, polymer adhesive and membrane technology, direct preci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24C22B23/00
CPCC22B3/24C22B23/0453Y02P10/20
Inventor 陈爱良钱振霍广生陈星宇刘旭恒李江涛赵中伟张美辰
Owner CENT SOUTH UNIV
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