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Laterite-nickel ore combination leaching process

A technology of laterite nickel ore and joint leaching, applied in the direction of improving process efficiency, can solve the problems of large project investment, high production and operation cost, and high requirements for high-pressure acid leaching process equipment

Inactive Publication Date: 2014-03-05
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the high-pressure acid leaching process has disadvantages such as high equipment requirements, high production and operation costs, and large project investment.

Method used

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  • Laterite-nickel ore combination leaching process
  • Laterite-nickel ore combination leaching process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Take 200g (dry basis) limonite-type lateritic nickel ore (Ni1.17%, Co0.10%, Fe43.05%, MgO1.43%), add water to adjust the slurry concentration to 33%, and use 98%H 2 SO 4 The solution is self-heating and stirring leaching under normal pressure. The leaching temperature is 95°C. After 6 hours of leaching, the leaching rates of nickel and cobalt reach 98.11% and 96.48%, respectively, and the total acid consumption is 224.48g, which is 1.1t acid / t ore.

[0063] Take 200g (dry basis) serpentine-type laterite nickel ore (Ni1.54%, Co0.02%, Fe5.53%, MgO32.0%), adjust the slurry concentration to 33%, and mix it with the slurry after normal pressure leaching After that, it is sent to the pressure kettle for two-stage pressure leaching. The leaching temperature is 150°C for 2 hours, the leaching pressure is 0.45MPa, the total leaching rates of nickel and cobalt reach 93.61% and 91.39% respectively, and the total acid consumption is 550kg / t ore . The Fe content of the solution af...

Embodiment 2

[0072] Take 800g of mixed laterite nickel ore (Ni1.52%, Fe16.32%, MgO23.49%, Si16.09%), and pass through 1mm sieve to obtain -1mm under-sieve ore (Ni1.54%, Fe18.68% , MgO21.05%, Si15.19%) 512g, +1mm sieve ore (Ni1.47%, Fe11.95%, MgO28.03%, Si17.76%) 288g, add water to adjust the slurry concentration to 35%, using 98%H2 SO 4 The solution is leached with self-heating and stirring under normal pressure. The leaching temperature is 100°C. After leaching for 5 hours, the nickel leaching rate reaches 98.45%, and the total acid consumption is 512g, which is 1t acid / t ore.

[0073] Take 288g+1mm sieve ore and grind it, add water to adjust the slurry concentration to 35%, mix it with the slurry after one-stage -1mm under-sieve ore leaching under normal pressure, then put it into the autoclave for two-stage pressure leaching, at a leaching temperature of 160°C Under leaching for 1.5h, the leaching pressure is 0.48MPa, the total nickel leaching rate reaches 94.05%, and the total acid co...

Embodiment 3

[0082] 420.5kg (dry basis) of limonite-type lateritic nickel ore (Ni1.18%, Co0.10%, Fe41.15%, MgO2.45%) was crushed and ground with 98%H 2 SO 4 The solution was leached with self-heating and stirring under normal pressure. After 4 hours of leaching, the leaching rates of nickel and cobalt reached 97.55% and 95.37%, respectively, and the total acid consumption was 462.55kg, equivalent to 1.1t acid / t ore.

[0083] Take 420.5kg (dry basis) of serpentine-type lateritic nickel ore (Ni1.55%, Co0.07%, Fe5.43%, MgO28.95%), adjust the slurry concentration to 33%-35%, and normal pressure After leaching, the ore slurry is mixed and sent to a pressure kettle for two-stage pressure leaching. Stirring and leaching under normal pressure for 2 hours at a leaching temperature of 140-160 ° C, the leaching rates of nickel and cobalt reach 94.14% and 92.58% respectively, and the obtained pressure leaching The pulp is 1298.33kg.

[0084] After pressure leaching, the slurry is added to limestone ...

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Abstract

The invention relates to a laterite-nickel ore combination leaching process, which comprises that: limonite type laterite-nickel ore is subjected to crushing grading, and then is added with concentrated sulfuric acid to carry out primary stage normal pressure stirring self-heating leaching, serpentine type laterite-nickel ore is subjected to crushing grinding, the obtained serpentine type laterite-nickel ore and the primary stage leached ore magma are concurrently conveyed to a pressure kettle, and serpentine is leached by using the primary stage normal pressure leaching residual acid and the acid produced through iron precipitation in the pressure kettle, or mixing type laterite-nickel ore is subjected to grading, the obtained fine particle-grade ore is added with concentrated sulfuric acid to carry out primary stage normal pressure stirring leaching, ore on the sieve is subjected to crushing grinding, the grinded ore and the primary stage leached ore magma are concurrently conveyed to a pressure kettle, and coarse particle-grade ore leaching is performed by using the primary stage normal pressure leaching residual acid and the acid produced through iron precipitation in the pressure kettle. According to the invention, the process has characteristics of no special requirements on ore types and grades, wide raw material adaptability, investment reduction, energy consumption reduction, production cost reduction, and simple process, wherein the Ni recovery rate and the Co recovery rate of the whole process of the present invention are respectively more than 90% and 88%, and are higher than the Ni recovery rate and the Co recovery rate of the treatment method in the existing non-high-pressure acid leaching technology.

Description

technical field [0001] The invention relates to a process for combined leaching of laterite nickel ore, that is, a process for extracting nickel and cobalt from laterite nickel ore, in particular to a process for extracting intermediate products of nickel and cobalt concentrates from nickel laterite ore. technical background [0002] The development of the global economy has led to a steady increase in the demand for nickel. With the depletion of nickel sulfide ore resources, laterite nickel ore, which accounts for 70% of the world's nickel resources, has become the main source of nickel. [0003] Laterite nickel ore is an oxide ore rich in nickel, and its nickel reserves account for about 70% of the total land-based nickel reserves on the earth. At present, the laterite nickel ore treatment processes at home and abroad are mainly divided into pyrotechnics and wet processes. The pyrotechnic process mainly includes four types: (1) RKEF smelting ferronickel; (2) blast furnace...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B3/04C22B3/08C22B3/44
CPCY02P10/20
Inventor 蒋开喜文森特·康贝莫·西蒙斯王海北刘三平赵磊李耀星曲志平王玉芳邹小平苏立峰李相良周立杰尹一男冯爱玲谢铿王光辉王爱萍王仍坚袁亮蒋伟蒋训雄张邦胜汪胜东
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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