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Method for processing nickel bearing raw material in chloride-based leaching

A chloride, leaching technology, applied in the direction of improving process efficiency, can solve problems such as large production

Inactive Publication Date: 2008-10-01
OUTOTEC OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of pyrometallurgical treatment is the production of large amounts of sulfur dioxide in the process, which usually requires further processing to sulfuric acid

Method used

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  • Method for processing nickel bearing raw material in chloride-based leaching
  • Method for processing nickel bearing raw material in chloride-based leaching
  • Method for processing nickel bearing raw material in chloride-based leaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] The nickel sulfide concentrate is leached according to the method of the present invention. The concentrate contains a major part of the nickel bound in the pentlandite form. Other major minerals are serpentinite, goethite and pyrite. The chemical analysis of the concentrate is:

[0080]

[0081] Leaching step 1

[0082] Nickel concentrate (1000g) was leached in solution (3170ml) with an initial content of:

[0083]

[0084] No oxidizing agent is used in leaching, and the pH of the solution is 2-3 during leaching. Copper from solution as chalcocite Cu 2 The S form precipitates while the nickel dissolves. After three hours of leaching at a temperature of 95° C., a solution (leaching product solution, PLS) was obtained, the composition of which was:

[0085]

[0086] After three hours, the solid composition was:

[0087]

[0088] Leaching step 2

[0089] The solid, i.e. the solid leaching residue after iron removal in the first leaching step, is oxidat...

Embodiment 2

[0116] The nickel sulphide concentrate according to Example 1 was leached into a chloride solution similar to Example 1. The first leaching step was carried out in a similar manner to Example 1, but in the second leaching step oxidation of sulfide and cupric chloride was carried out directly by chlorine gas.

[0117] The test was carried out by oxidation of the leach residue from the first step and the feed solution of the second step. The analysis of the product solution and precipitate is given below:

[0118] the solution

[0119]

[0120] solid (leach residue)

[0121]

[0122] The solution from the second leaching step was subjected to the first leaching step, after which the solution was further processed in a similar manner to Example 1.

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PUM

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Abstract

The invention relates to a method for processing a nickel product from nickel- bearing sulphidic raw materials, such as nickel sulphide concentrate or ore. According to the invention, the raw material is leached in atmospheric conditions in an aqueous solution of sodium chloride and copper (II) chloride. The reagents needed for leaching nickel and for processing the products, such as chlorine, hydrogen and sodium hydroxide, are obtained from chlorine-alkali electrolysis that is integrated as a step in the process.

Description

field of invention [0001] The present invention relates to a process for treating nickel-containing feedstocks such as nickel sulphide concentrates or nickel ores by means of chloride-based leaching to obtain nickel products. The leaching of the nickel feedstock is carried out under atmospheric conditions and the reactants such as chlorine, hydrogen and sodium hydroxide required for leaching the nickel and treating its products are obtained in chlor-alkali electrolysis as a step of the process. Background of the invention [0002] Nickel resources in the world are divided into two main categories, sulfide ores and oxide ores (later ores). Conventional nickel sulfide ore development is mainly a pyrometallurgical method, in which the mined ore is first finely ground, and then the nickel sulfide ore is concentrated by froth flotation to produce nickel concentrate. The concentrate is then further processed by smelting and reduction to produce a nickel-containing matte that also...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B26/00C22B11/00
CPCC22B23/0423C22B3/0005C22B3/42C22B5/12C22B15/0069C22B15/0089C22B23/0461Y02P10/20C22B3/26
Inventor O·西瓦里南J·卡洛南L·哈万拉米D·克利比斯
Owner OUTOTEC OYJ
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