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High-efficiency leaching process of nickel from laterite-nickel ore

A laterite nickel ore and leaching technology is applied in the field of chemical beneficiation, which can solve the problems of serious pollution, serious corrosion and low cost, and achieve the effects of reducing production cost, ensuring production efficiency and reducing energy consumption.

Inactive Publication Date: 2009-01-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this process are the low energy utilization rate and the inability to control the emission of high-temperature roasting slag fine-grained dust
The matte-making smelting process is similar to the ferronickel smelting process, but also has the disadvantages of high energy consumption and serious pollution (BERGMAN R A. Nickel production from low-iron laterite ores: Process descriptions [J]. Cim. Bulletin., 2003, 96 (1072 ): 127-138)
In 1998, Murrin-Murrin, Cawse and Bulong in Western Australia used high pressure acid leaching process to treat laterite nickel ore (WHITTINGTON B I, MUIR D. Pressure Acid Leaching of Nickel Laterites: A Review [J]. Mineral Processing and Extractive Metallurgy Review, 2000, 21( 6): 527-599), this process has the lowest cost among the above-mentioned treatment processes, iron can be retained in the leaching slag in the form of solid phase, and the leaching rate of Ni and Co is >90%, but the titanium alloy autoclave used is expensive And the corrosion is serious, and there is also the problem that a large amount of leaching slag produced after the reaction cannot be properly disposed of

Method used

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  • High-efficiency leaching process of nickel from laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The silicate-type lateritic nickel ore is crushed and sieved to obtain leached materials with 59.9% materials<74um. Then add a certain amount of leached material into 5% (v / v) sulfuric acid solution to prepare a slurry system with a liquid-solid ratio of 3mL / g. The stirring and leaching reaction was carried out under the condition that the rotation speed of the mixer was 500 rpm, the reaction temperature was 90°C, and the reaction time was 240 minutes. After the reaction, the solid-liquid separation was carried out immediately, and the solid samples were dried, weighed, and reserved for sample preparation. The liquid was sampled for laboratory analysis, and the leaching rate of nickel was 31.2%.

Embodiment 2

[0026] The silicate-type lateritic nickel ore is crushed and sieved to obtain leached materials with 59.9% materials<74um. Then add a certain amount of leached material into 10% (v / v) sulfuric acid solution to prepare a slurry system with a liquid-solid ratio of 3mL / g. The stirring and leaching reaction was carried out under the condition that the rotation speed of the mixer was 500 rpm, the reaction temperature was 90°C, and the reaction time was 240 minutes. After the reaction, the solid-liquid separation was carried out immediately, and the solid samples were dried, weighed, and reserved for sample preparation. Liquid sampling was carried out for laboratory analysis, and the leaching rate of nickel was 68.2%.

Embodiment 3

[0028] The silicate-type lateritic nickel ore is crushed and sieved to obtain leached materials with 59.9% materials<74um. Then add a certain amount of leached material into 20% (v / v) sulfuric acid solution to prepare a pulp system with a liquid-solid ratio of 3mL / g. The stirring and leaching reaction was carried out under the condition that the rotation speed of the mixer was 500 rpm, the reaction temperature was 90°C, and the reaction time was 240 minutes. After the reaction, the solid-liquid separation was carried out immediately, and the solid samples were dried, weighed, and reserved for sample preparation. The liquid was sampled for laboratory analysis, and the leaching rate of nickel was 79.7%.

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Abstract

The invention discloses an effective extraction technique for the nickel in a lateritic nickel ore. The invention takes the lateritic nickel ore of silicate as the raw material and takes vitriol as an extraction agent after being cracked and screened to add the extraction materials into the extraction liquid with a certain concentration for reacting for a certain period of time under a certain temperature and stirring speed; after the reaction is finished, solid-liquid separation is instantly carried out to obtain the extraction liquid rich in nickel. The invention carries out stirring extraction reaction under a normal pressure and realizes the effective extraction of the nickel in the lateritic nickel ore by selecting a proper extraction ore slurry concentration and adjusting the extraction reaction time, the temperature and the rotating speed of a stirrer; the technique of the invention has the advantages of low acid consumption and less corrosion to devices, etc. Besides, the technique of the invention is applicable for batch production.

Description

technical field [0001] The invention belongs to the field of chemical mineral processing, and in particular relates to a process for efficiently extracting nickel from laterite nickel ore. Background technique [0002] With the rapid development of my country's iron and steel industry, the demand for metal nickel is increasing, but the production of metal nickel through traditional nickel sulfide ore dressing and smelting not only cannot meet the demand, but also the nickel sulfide ore resources are facing the plight of depletion. In 2003, the global demand for metallic nickel exceeded 1.2 million tons, and it will still increase at an annual rate of 4%, but the metallic nickel produced from laterite nickel ore only accounts for 42% of the total output. It is estimated that by 2010, the gap between nickel supply and demand will exceed 200,000 tons per year. According to statistics, the nickel ore resources of land-based nickel grade ≥1% in the world contain 130 million tons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B3/04C22B3/08
CPCY02P10/20
Inventor 冯其明罗伟欧乐明张国范卢毅屏
Owner CENT SOUTH UNIV
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