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Method for strongly leaching laterite-nickel ore at normal pressure by using sulphuric acid

A laterite nickel ore, enhanced leaching technology, applied in the direction of improving process efficiency, etc., can solve the problems that the process technology has not been popularized and applied, the nickel leaching rate is not high enough, and the leaching residual acid is high, and achieves complete leaching reaction, strong corrosiveness, Highly reactive effect

Inactive Publication Date: 2013-06-12
广西冶金研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this patented technology still has the following problems: first, the nickel leaching rate is not high enough, it can only be increased from 89% to 96%; Neutralization, 20% of the nickel in the pre-neutralization slag has not been leached, including 4% of the nickel in the leaching slag, and these useful metal elements such as nickel and cobalt will be lost with the leaching slag and the pre-neutralization slag
Thirdly, magnesite is used as neutralizing agent, because magnesite is not available in other regions except Liaoning, my country, so this technology has not been popularized and applied.
But the leaching rate of nickel by this process is only 90-93wt%

Method used

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  • Method for strongly leaching laterite-nickel ore at normal pressure by using sulphuric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The laterite nickel ore imported by a certain unit contains Ni 1.4Wt% on average, take a small amount of grinding at random, get 50 grams of the above-mentioned laterite nickel ore and grind it to -100 mesh, use 200ml water to mix, add 250ml concentrated sulfuric acid under stirring, at this time When the temperature reaches 120°C, control the temperature rise to 150°C, and maintain the reaction for 30 minutes. At this time, the liquid level line is 330ml, and the leaching liquid-solid ratio is 6:1. Cool down to 80°C, filter, and rinse to obtain 270ml of filtrate and 100ml of eluent. 25 grams of leaching residue after drying, containing Ni 0.006wt%, containing SiO 2 79.99wt%, raw ore contains Ni 1.40wt%, Ni leaching rate 99.8wt%.

Embodiment 2

[0026] Get 50 grams of the same laterite nickel ore as in Example 1, add 100 ml of the eluent of Example 1 to adjust the slurry, add 100 ml of concentrated sulfuric acid, then add all the filtrate in Example 1, heat up to 160 ° C, and maintain it for 45 minutes. When the liquid level line was 430ml, the leaching liquid-solid ratio was 8.5:1, cooled to 80°C and filtered, the filtrate and eluent were not measured, and finally obtained 24 grams of dried leaching residue, containing Ni 0.006wt%, containing SiO 2 81.50wt%, Ni leaching rate 99.8wt%.

Embodiment 3

[0028] Adopt the same source of laterite nickel ore as in Example 1, randomly take about 1 kg and grind it to ≤100 mesh, then analyze several elements such as nickel and cobalt, and in embodiment 3, take 400 grams of the above-mentioned finely ground laterite nickel ore, add water 1000ml to adjust Slurry, add concentrated sulfuric acid 1500ml, heat up to 160°C, at this time, the liquid level line is 2000ml, the calculated liquid-solid ratio of leaching is 4.5:1, maintain for 40 minutes, cool down to 90°C and filter, and obtain 1300ml of leaching mother liquor and 1200ml of eluent. Finally, the dry weight of the leached residue was 190 grams. The content of each element in the leaching slag and the results of the leaching rate are shown in Table 1.

[0029] Table 1 Example 3 The content of each element in the leaching slag and the results of the leaching rate

[0030] the element

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Abstract

The invention relates to a method for strongly leaching laterite-nickel ore at normal pressure by using sulphuric acid, which comprises the following steps of: adding laterite-nickel ore into leacheate, mixing and ball-milling to be less than or equal to 100 mesh, adding concentrated sulphuric acid according to the liquid-solid ratio of (4-9):1, increasing the temperature to 150-160 DEG C, maintaining reaction for 20-60 minutes, decreasing the temperature to 80-100 DEG C, filter pressing, and pressing filtrate in a thermal insulation storage tank; adding leacheate, the volume of which is the same to that of a filter cake, to carry out pressure washing and filter pressing, obtaining filtrate and the filter cake again, also pressing the filtrate in the thermal insulation storage tank, discharging the filter cake, mixing and washing by using hot water so that crystal substances are thoroughly dissolved, and filtering to obtain the filtrate and the filter cake; and purifying the filtrate and removing impurities from the filtrate, continuously carrying out pressure washing by using clean water through the filter cake in a counter-current manner, and continuously detecting the pH value of pressure washing liquid until leached residues achieve emission standard. According to the invention, the leaching efficiency of nickel-cobalt can be increased by above 99wt%; most of all metallic elements which can be dissolved by sulphuric acid can be leached; silica gel does not exist in the leaching process; and the filtering performance of the leached residues is good.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal hydrometallurgy, in particular to a method for intensified leaching of laterite nickel ore with sulfuric acid at normal pressure. Background technique [0002] At present, the two major methods of processing laterite nickel ore in the world are: hydrometallurgy uses high-pressure leaching to process low-magnesium laterite nickel ore to produce electrolytic nickel; pyrometallurgy uses rotary kiln-electric furnace (RKEF) method to process low-iron laterite nickel ore to produce nickel iron. In China, the first sulfuric acid heap leaching method was used to leach laterite nickel ore in Yuanjiang, Yunnan, which filled the gap in the wet smelting of laterite nickel ore in my country. Later, the composite hydrometallurgy method of sulfuric acid heap leaching and sulfuric acid tank leaching was used to treat the mixed laterite nickel ore of the silicon-magnesium-nickel ore type and limonite ty...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/22C22B23/00
CPCY02P10/20
Inventor 伍耀明
Owner 广西冶金研究院有限公司
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