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Method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore

A technology of high-pressure leaching and laterite nickel ore, applied in the direction of improving process efficiency, etc., can solve the problems of large ore processing capacity, low recovery rate of nickel and cobalt, and insufficient recovery of valuable metals

Inactive Publication Date: 2010-07-07
厦门紫金矿冶技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this process discards the coarse-grained limonite part with low nickel and cobalt grades, only the fine-grained saprolite part with high nickel and cobalt grades is used to recover nickel and cobalt by high-pressure acid leaching PAL process, and the sulfuric acid utilization rate is high, but The discarded coarse fraction also contains a considerable amount of nickel metal that has not been recovered, affecting the economic benefits of the entire process
[0030] The above-mentioned high-pressure acid leaching process solves the problem of nickel and cobalt recovery in the lateritic nickel ore containing limonite and saprolite, but there are some weaknesses. For example, when all high-pressure acid leaching is used, the ore processing capacity is large, and the equipment cost is high. High cost, excessive acid consumption, etc.; when limonite and saprolite ore are treated separately, the recovery rate of nickel and cobalt is low, the valuable metals in laterite nickel ore cannot be fully recovered, and the acid in the leaching process cannot be fully utilized, etc.

Method used

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  • Method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore
  • Method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore
  • Method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] see figure 1, the ore is pre-screened first. The raw ore is transported by car from the stope to the raw ore warehouse of the ore washing workshop (or the raw ore storage yard is stockpiled, and then fed into the raw ore warehouse by the front loading machine), with a maximum block size of φ1000mm. The large pieces over 300mm are separated by the bar screen on the top of the original ore bin, and the material under the bar screen enters the ore washing operation, and the large pieces on the screen are removed or crushed by a mobile hydraulic rock crusher, and then transported by the ore truck Transport it back to the stope for backfill or as road construction stone.

[0059] Then wash, grind and concentrate. The material under the bar screen on the top of the raw ore bin enters the raw ore bin and then is fed into the cylinder washing machine through the iron plate feeder. After washing, the φ+20mm material is crushed to φ-20mm and all the φ-20mm ore Through the comb...

Embodiment 2

[0065] The ore used in Example 2 comes from the Moweitang laterite nickel deposit in Myanmar. After the ore is classified, the coarse-grained part of limonite and the fine-grained part of saprolite have the composition given in Table 1.

[0066] Table 1 Composition of the coarse-grained part of limonite and fine-grained part of saprolite after ore classification

[0067]

[0068] 268.35g of saprolite, 402.53ml of water and 463.30ml of coarse-grained ore heap leaching liquid were adjusted into a pulp and placed in an autoclave, and a certain amount of sulfuric acid was added to conduct a high-pressure acid leaching test. The fixed leaching conditions are as follows, the leaching temperature is 250°C, the leaching oxygen partial pressure is 0.6MPa, the leaching time is 1h, and the stirring intensity is 600rpm. The relationship between the amount of acid added and the leaching rate of nickel was investigated.

[0069] After the leaching is completed, filter the leached pulp w...

Embodiment 3

[0074] The ore used in Example 3 is the same as that in Example 2, all of which come from the Moweitang laterite nickel deposit in Myanmar. The coarse-grained part of limonite and the fine-grained part of saprolite after ore classification also have the composition given in Table 1.

[0075] 268.35g of saprolite, 402.53ml of water, 13g of sodium sulfate and 463.30ml of coarse ore heap leaching liquid were adjusted into a pulp and placed in an autoclave, and 43.8ml of sulfuric acid was added for high-pressure acid leaching test. The fixed leaching conditions are as follows, the sulfuric acid dosage is 300kg / t ore, the leaching temperature is 250°C, the leaching oxygen partial pressure is 0.6MPa, the leaching time is 1h, and the stirring intensity is 600rpm. Investigate the leaching rate of metals such as nickel and cobalt.

[0076] After the leaching is completed, filter the leached pulp with a suction filtration device, and perform 4-stage rinsing with 1000ml of heated acid wa...

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Abstract

The invention discloses a method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore, which combines the heap leaching technology with the high-pressure leaching technology to reduce acid consumption during the treatment of nickel laterite ore; residual sulfuric acid in coarse particle immersion of limonite heap is sufficiently utilized and sodium sulfate is added during the stage of high-pressure leaching so that sulfuric acid is generated while yellow natrojarosite is formed, thereby further reducing the consumption of sulfuric acid during the stage of high-pressure leaching.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal hydrometallurgy, and in particular relates to a treatment method of laterite nickel ore, in particular to a process method for treating laterite nickel ore by combining heap leaching technology and high-pressure leaching technology, and reducing the acid consumption of the overall process. Background technique [0002] Nickel is a metal with relatively abundant reserves on the earth, and it belongs to the range of commonly used non-ferrous metals. According to the US Geological Survey, the world's nickel reserves in 2006 were 64 million tons, and the reserve base was 140 million tons. The world's terrestrial resources of about 1% nickel content are about 130 million tons. 60% of them belong to the lateritic nickel ore, and the associated metals are mainly iron and cobalt, which are mainly distributed in Cuba, New Caledonia, Indonesia, the Philippines, Brazil, Colombia and Dominica near the equato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B3/08C22B23/00
CPCY02P10/20
Inventor 陈景河刘升明马龙王中溪陈庆根
Owner 厦门紫金矿冶技术有限公司
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