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Method for keeping balance of sodium-magnesium-water system in technique for extracting nickel from lateritic nickel ore by wet process

A technology of laterite nickel ore and wet method, which is applied in the field of magnesium and water system balance and sodium retention in the process of wet nickel extraction from laterite nickel ore, which can solve the problems of large nickel loss, high energy consumption, and long process time, and achieve reduction Disposal cost, improvement of recovery rate, remarkable effect of economic efficiency

Inactive Publication Date: 2011-09-14
广西银亿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the solution to the accumulation of sodium, magnesium and water in the wet nickel extraction system of laterite nickel ore is generally to regularly extract the nickel sulfate solution for freezing treatment, so that the sodium and magnesium in it are crystallized in the form of hydrated sulfate and removed by an open circuit , this method needs to stop production, the process time is long, the energy consumption is high, and the loss of nickel is large

Method used

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  • Method for keeping balance of sodium-magnesium-water system in technique for extracting nickel from lateritic nickel ore by wet process
  • Method for keeping balance of sodium-magnesium-water system in technique for extracting nickel from lateritic nickel ore by wet process

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Embodiment 1

[0029] See the process flow figure 1 , a lateritic nickel ore in the transitional layer produced in Indonesia, containing Ni 1.5%, Fe 20%, Mg 12.5%, after atmospheric sulfuric acid leaching, jarosite impurity removal, and solid-liquid separation, the nickel sulfate solution contains Ni 3.6g / L, Fe 0.18g / L, Mg 24g / L, this nickel sulfate solution is deposited nickel with the sodium hydroxide solution of 30%wt, and the nickel hydroxide obtained is acid-dissolved with concentrated sulfuric acid, and the prepared nickel sulfate solution Containing Ni 70g / L, Fe 0.01g / L, Na 32g / L, Mg 7.5g / L, it is extracted with P204 solvent to remove impurities such as iron, manganese, copper and zinc. The regeneration treatment steps of P204 before extraction and removal of impurities are as follows: Stir and mix the P204 organic phase after back-extraction with 500g / L sodium hydroxide solution, carry out saponification of P204 sodium, and measure the saponification rate of P204 in the organic phase...

Embodiment 2

[0031]The treatment process flow is the same as in Example 1. Laterite nickel ore contains 1.81% Ni, 22% Fe, and 15.5% Mg. After leaching with sulfuric acid at atmospheric pressure, impurity removal by jarosite method, and solid-liquid separation, the nickel sulfate solution contains Ni 4.3g / L, Fe 0.21g / L, Mg 26g / L, this nickel sulfate solution is deposited nickel with saturated calcium hydroxide solution, the nickel hydroxide obtained is acid-dissolved with concentrated sulfuric acid, and the obtained nickel sulfate solution contains Ni 72g / L, Fe 0.02g / L, Na 35g / L, Mg 8.5g / L, and P204 solvent extraction to remove impurities such as iron, manganese, copper and zinc. The regeneration treatment steps of P204 before extraction and removal of impurities are as follows: Stir and mix the P204 organic phase after back-extraction with 450g / L sodium hydroxide solution, carry out sodium saponification of P204, and measure the saponification rate of P204 in the organic phase by acid-base ...

Embodiment 3

[0033] The treatment process is the same as that in Example 1. Laterite nickel ore contains 1.40% Ni, 17.5% Fe, and 10.5% Mg. After being leached with sulfuric acid at atmospheric pressure, impurity removal by jarosite method, and solid-liquid separation, the nickel sulfate solution contains Ni 3.2g / L, Fe 0.15g / L, Mg 22g / L, this nickel sulfate solution is deposited nickel with 80g / L magnesium hydroxide solution, the nickel hydroxide obtained is acid-dissolved with concentrated sulfuric acid, and the obtained nickel sulfate The solution contains Ni 72g / L, Fe 0.02g / L, Na 35g / L, and Mg 15g / L. First, it is extracted with P204 solvent to remove impurities such as iron, manganese, copper, and zinc. The regeneration treatment steps of P204 before extraction and removal of impurities are as follows: Stir and mix the P204 organic phase after back-extraction with 500g / L sodium hydroxide solution, carry out saponification of P204 sodium, and measure the saponification rate of P204 in the ...

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Abstract

The invention discloses a method for keeping balance of a sodium-magnesium-water system in a technique for extracting nickel from lateritic nickel ore by a wet process, which is characterized by comprising the following steps: (a) dissolving nickelous hydroxide, which is obtained by carrying out alkali nickel precipitation on nickel sulfate leach liquor, in sulfuric acid; (b) extracting the nickel sulfate solution obtained in the step (a) with a P204 extractant to remove impurities, wherein P204 sodium soap is converted into nickel soap before removing the impurities; (c) extracting the nickel sulfate solution obtained in the step (b) with a P507 extractant to remove cobalt and magnesium, wherein P507 sodium soap is converted into nickel soap before removing the cobalt and magnesium; and (d) evaporating the anolyte, which is obtained by electrolyzing the nickel sulfate solution obtained in the step (c), thereby removing part of moisture. By using the method provided by the invention, the sodium, magnesium and water are balanced in the technique for extracting nickel from lateritic nickel ore by a wet process, so that the production can be carried out continuously, thereby increasing the recovery rate of nickel, lowering the treatment cost and having obvious economic efficiency.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a method for maintaining the balance of sodium, magnesium and water systems in the wet nickel extraction process of laterite nickel ore. Background technique [0002] In the process of wet nickel extraction from laterite nickel ore, the acid leaching process is mainly used to leach nickel in the ore. Whether it is atmospheric pressure leaching or high pressure leaching, sulfuric acid is mostly used as the leaching agent. For the nickel extraction process with electrolytic nickel as the product, the concentration of nickel sulfate after leaching and preliminary chemical impurity removal is very dilute, and the nickel content is often only 1-5g / L. A precipitation-acid-dissolving step is required to increase the nickel in the solution. Concentration, the nickel sulfate solution after precipitation-acid dissolution also contains impurities such as iron, manganese, copper, zinc, calcium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B3/38
CPCY02P10/20
Inventor 肖万林王多冬和润秀王亚秦王春轶姚亨桃周科辉容仕甲
Owner 广西银亿新材料有限公司
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