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Laterite nickel ore treatment method

A technology of lateritic nickel ore and treatment method, applied in nickel sulfate, process efficiency improvement, cobalt sulfate, etc., can solve problems such as high concentration of sodium ions, lower production efficiency, increase production cost, etc., to reduce salt concentration, The effect of improving production efficiency and reducing operating costs

Active Publication Date: 2019-01-18
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the above-mentioned traditional smelting process is adopted, the concentration of sodium ions in the wastewater is high, which will lead to serious fouling on the inner wall of the autoclave and the surface of internal components in the high-pressure leaching step, reducing production efficiency and increasing production costs

Method used

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  • Laterite nickel ore treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Mix the slurry of lateritic nickel ore 1 (see Table 1 for the composition) with sulfuric acid of 98% concentration for pressure leaching treatment to obtain a leachate; wherein, the feed concentration of the pressure leaching slurry is 40%, and the temperature of the pressure leaching treatment is 255 degrees Celsius , the pressure is 48bar, the leaching time is 1h, and the terminal acidity is 40g / L;

[0065] Table 1

[0066]

[0067] Add iron and aluminum in the limestone slurry precipitation solution to the obtained leaching solution; one of the first stage of neutralization and precipitation of iron and aluminum is precipitation at a temperature of 75°C for 5 hours, and the pH value of the end point is 3.8; the second stage of neutralization of precipitation of iron and aluminum is at 65°C Precipitate at a certain temperature for 4 hours, and the final pH value is 4.8.

[0068] After removing iron and aluminum, the nickel-cobalt-containing solution is added to th...

Embodiment 2

[0073] Mix the pulp of laterite nickel ore 2 (see Table 3 for the composition) with concentrated sulfuric acid of 98% concentration and carry out pressure leaching treatment to obtain a leachate; wherein, the feed concentration of the pressure leaching pulp is 45%, and the temperature of the pressure leaching treatment is 250 Celsius, the pressure is 46bar, the leaching time is 1h, and the terminal acidity is 32g / L;

[0074] table 3

[0075]

[0076] Add iron and aluminum in the limestone slurry precipitation solution to the obtained leaching solution; one of the first stage of neutralization and precipitation of iron and aluminum is precipitation at a temperature of 70°C for 4 hours, and the pH value of the end point is 3.5; the second stage of neutralization of precipitation of iron and aluminum is at 60°C Precipitate at a certain temperature for 3.5 hours, and the final pH value is 4.6.

[0077] After removing iron and aluminum, the nickel-cobalt-containing solution is ...

Embodiment 3

[0082] Mix the slurry of lateritic nickel ore 3 (see Table 5 for the composition) with concentrated sulfuric acid of 98% concentration and carry out pressure leaching treatment to obtain a leachate; wherein, the feeding concentration of the pressure leaching slurry is 43%, and the temperature of the pressure leaching treatment is 252 Celsius, the pressure is 46.1bar, the leaching time is 1h, and the terminal acidity is 45g / L;

[0083] table 5

[0084]

[0085] Add iron and aluminum in the limestone slurry precipitation solution to the obtained leaching solution; one of the first stage of neutralization and precipitation of iron and aluminum is precipitation at a temperature of 72 ° C for 4.5 hours, and the pH value of the end point is 3.7; the second stage of neutralization and precipitation of iron and aluminum is at 60 Precipitate at a temperature of ℃ for 4 hours, and the final pH value is 4.5.

[0086] The nickel-cobalt-containing solution after removing iron and alumi...

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Abstract

The invention provides a laterite nickel ore treatment method, which comprises the following steps: sulfuric acid is adopted to carry out pressure leaching treatment on laterite nickel ore pulp, so that laterite nickel ore leachate is obtained; first neutralizer is added into the laterite nickel ore leachate to precipitate iron and aluminum, so that a nickel-and-cobalt-contained solution is obtained; second neutralizer is added into the nickel-and-cobalt-contained solution to precipitate nickel and cobalt, so that a crude product is obtained, and the crude product is gypseous nickel cobalt hydroxide; sulfuric acid is adopted to carry out releaching treatment on the crude product, so that a nickel cobalt sulfate solution and gypsum ore pulp are obtained; after the nickel cobalt sulfate solution is extracted, purified and evaporatively crystallized, nickel sulfate and cobalt sulfate are respectively obtained; the first neutralizer is limestone ore pulp or calcium hydroxide pulp, and thesecond neutralizer is calcium hydroxide pulp. When the treatment method disclosed by the invention is adopted, the amount of wastewater in a production system can be remarkably reduced, energy is saved and energy consumption is reduced, so that the treatment cost is reduced, and moreover, the production efficiency can also be increased.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a treatment method for laterite nickel ore. Background technique [0002] Nickel is an important non-ferrous metal raw material with abundant reserves on the earth. Nickel ore is mainly divided into copper-nickel sulfide ore and nickel oxide ore, and the development and utilization of nickel oxide ore is mainly based on laterite nickel ore. At present, projects that use hydrometallurgy to process laterite nickel ore generally use the process of high-pressure acid leaching-thickener washing separation-iron removal, aluminum-nickel-cobalt precipitation to prepare nickel-cobalt hydroxide intermediate products or nickel-cobalt sulfide intermediate products, intermediate products Further adopt leaching-purification-evaporative crystallization or electrowinning process to produce final products such as nickel sulfate, cobalt sulfate or electro-nickel and electro-cobalt. For t...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/44C22B3/38C22B23/00C01G53/10C01G51/10
CPCC01G51/10C01G53/10C22B3/08C22B3/44C22B23/043C22B23/0461C22B23/0476C22B3/3844C22B3/3846Y02P10/20
Inventor 丁淑荣陆业大刘诚殷书岩傅建国董爱国
Owner CHINA ENFI ENGINEERING CORPORATION
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