Method for bath leaching and extracting nickel and cobalt from garnierite

A silicon-magnesium-nickel ore and pool leaching technology, which is applied in the field of hydrometallurgy, can solve the problems of large area occupied by heap leaching, difficulty in adopting heap leaching technology, and high water evaporation rate, and achieves short process, low production cost, and high permeability Good results

Inactive Publication Date: 2011-05-18
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

[0008] It is also proposed to use the heap leaching method to treat lateritic nickel ore. However, in the existing heap leaching process, the magnesite and limonite-type ores are mixed together for heap leaching. As a result, the infiltration speed is slow, the leaching period is long, and Heap leaching covers a large area, which will be restricted for enterprises with limited plant area
In areas with heavy rainfall or short rainy season but high rainfall intensity, the solution in the pile will be seriously diluted, which will have a great impact on the stability of production
The large-scale heap leaching process also has the problems of large water consumption and high water evaporation rate, and it is difficult to use the heap leaching process in arid areas short of water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The silicon-magnesium-nickel ore contains 1.5% nickel. Firstly, it is crushed by a crusher to 0.5-10mm; the crushed ore is evenly loaded into the anti-corrosion treated leaching tank, the charging depth is 3m, and the nickel content is 1-2g. / l leach solution is mixed with sulfuric acid until the concentration of sulfuric acid is 90g / l as leach agent and pumped into the tank, the liquid surface of the leach agent is 50mm below the upper surface of the ore, and the soaking temperature is 80 degrees Celsius. After soaking for 2 hours, the leach solution is discharged from the bottom outlet Drain into the reservoir. When the concentration of nickel ions in the leaching solution is lower than 3g / l, the leaching solution is acidified and returned to the leaching tank to continue leaching; when the concentration of nickel ions in the leaching solution is higher than or equal to 3g / l, the leaching solution is sent to the next treatment process. Prepare a new leaching agent and...

Embodiment 2

[0024] The silicon-magnesium-nickel ore contains 1.2% nickel. Firstly, the silicon-magnesium-nickel ore is crushed with a crusher to between 5 and 30mm; The leaching solution with a content of 2-3g / l is mixed with sulfuric acid until the concentration of sulfuric acid is 70g / l as a leaching agent and pumped into the tank. The liquid level of the leaching agent exceeds the upper surface of the ore by 100mm, and the soaking temperature is 50 degrees Celsius. After soaking for 3 hours, the leaching solution is released. to the reservoir. When the nickel ion concentration of the leaching solution is lower than 3g / l, the leaching solution is acidified and then returned to the leaching tank to continue leaching. When the nickel ion concentration is higher than or equal to 3g / l, the leaching solution is sent to the next treatment process. Prepare a new leaching agent and pump it into the leaching tank to continue leaching. When the nickel content in the leaching slag is as low as 0.2...

Embodiment 3

[0026] The silicon-magnesium-nickel ore contains 1.0% nickel. Firstly, the silicon-magnesium-nickel ore is crushed to 15-30mm by a crusher; the crushed ore is evenly loaded into the anti-corrosion treated leaching tank, and the charging depth is 5m; the prepared A good sulfuric acid solution with a sulfuric acid concentration of 50g / l is pumped into the pool. The level of the leaching agent exceeds the upper surface of the ore by 300 mm. The soaking temperature is 30 degrees Celsius. After soaking for 20 hours, the leachate is released to the storage pool. When the concentration of nickel ions in the leaching solution is lower than 2g / l, the leaching solution is returned to the leaching tank after acid adjustment to continue leaching. When the concentration of nickel ions is higher than or equal to 2g / l, the leaching solution is sent to the next treatment process. When the nickel content in the leaching slag is reduced to 0.24%, the acid and nickel sulfate on the surface of the...

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Abstract

The invention discloses a method for bath leaching and extracting nickel and cobalt from garnierite, comprising the following steps of: (1) crushing the garnierite into ore particles; (2) placing the ore particles in a leaching bath; (3) throwing a leaching agent from a liquid inlet at the top of the leaching bath for soaking the ore particles, wherein the ore particles must be immersed in the liquid level of the leaching agent; (4) discharging a leaching liquid from a liquid outlet at the bottom of the leaching bath; and (5) preparing a novel leaching agent and repeating the step (3) and the step (4) until the nickel content in the ore is lower than a preset value. The method is short in process and simplicity in operation, involves less equipment, and can be used for making the leaching period shortened to about 30 days, leading the nickel leaching rate to reach over 80 percent, and enabling the leaching liquid to have a good permeability. Moreover, the prices of used related materials, the acid consumption and the production cost are low.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a method for leaching nickel and cobalt in silicon-magnesium-nickel ore pools. Background technique [0002] Laterite nickel ore can be simply divided into limonite type and magnesite ore, the main difference of which is the content of iron and magnesium in the ore. Generally, the magnesium-magnesium-nickel ore contains high magnesium, while the limonite-type lateritic nickel ore contains high iron and low magnesium content. At present, industrial production includes pyro-smelting to produce ferronickel or high nickel matte (fire process for short), wet acid leaching (HPAL, EPAL or PAL) process, heap leaching process, etc. [0003] The pyrotechnic process is that the ore is dried and subjected to high-temperature reduction roasting, and then smelted in an electric furnace to produce nickel-iron or high-matte nickel (in the case of adding sulfur). Products: nickel-iron with Ni con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B23/00
CPCY02P10/20
Inventor 肖万林王多冬和润秀王亚秦丘能容仕甲李海燕陈彦林
Owner 广西银亿新材料有限公司
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