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Improved method for processing high-iron and high-magnesium laterite and obtaining hematite product

A technology for laterite ore and hematite, applied in the field of nickel ore smelting, can solve the problems of acid consumption, energy consumption and low equipment investment cost, and achieve the effect of realizing no acid discharge, avoiding environmental pollution, and avoiding excessive acidity

Active Publication Date: 2013-04-24
GUANGXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method overcomes the defects of high acid consumption in the existing normal-pressure acid leaching process and the need for expensive and complicated autoclaves in the high-pressure acid leaching process, and achieves high-efficiency nickel, cobalt, iron and silicon while obtaining high nickel and cobalt leaching rates. Separation and production of hematite products; and the acid consumption, energy consumption and equipment investment costs in the production process are all low

Method used

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  • Improved method for processing high-iron and high-magnesium laterite and obtaining hematite product
  • Improved method for processing high-iron and high-magnesium laterite and obtaining hematite product
  • Improved method for processing high-iron and high-magnesium laterite and obtaining hematite product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) the ore sample 1 # The aqueous pulp (solid-to-liquid mass ratio is 1:10) is added to the first leaching tank, 98% (w / w) sulfuric acid (acid ore mass ratio is 1.7:1) is added, the temperature is raised to 100°C, and the leaching is carried out for 1.5h. The pulp is filtered to obtain leach slag A and leach solution B;

[0039] (2) sending leach solution B into the second leaching kettle;

[0040] (3) According to ore sample 1 # and sample 3 # Composition, free acid content of leaching solution B and the amount of acid that can be released by iron deposition in leaching solution B, determine that ore sample 3 # The addition amount is ore sample 1 # 2 times; according to 10g air / g ore (including ore sample 1 # and sample 3 # ) and 0.05g hematite / g ore (including ore sample 1 # and sample 3 # ) in the amount of adding air and seed crystals (hematite) respectively in the second leaching kettle; ore sample 3 # The water-based pulp (solid-liquid mass ratio is 1:10...

Embodiment 2

[0047] (1) the ore sample 1 # The aqueous pulp (solid-to-liquid mass ratio is 1:10) is added to the first leaching tank, 98% (w / w) sulfuric acid (acid-mineral mass ratio is 2.5:1) is added, the temperature is raised to 95°C, and the leaching is carried out for 2.5h. The pulp is filtered to obtain leach slag A and leach solution B;

[0048] (2) sending leach solution B into the second leaching kettle;

[0049] (3) According to ore sample 1 # and sample 3 # Composition, free acid content of leaching solution B and the amount of acid that can be released by iron deposition in leaching solution B, determine that ore sample 3 # The addition amount is ore sample 1 # 3 times; the ore sample 3 # The aqueous pulp (solid-to-liquid mass ratio is 1:10) is divided into 4 shares and added to the second leaching tank for leaching, and the addition and leaching are performed according to the following conditions: first add the first strand of pulp (mine sample 3 # 50% of the total volum...

Embodiment 3

[0056] (1) the ore sample 2 # The aqueous pulp (solid-to-liquid mass ratio is 1:10) is added to the first leaching tank, 98% (w / w) sulfuric acid (acid-mine mass ratio is 1.5:1) is added, the temperature is raised to 90°C, and the leaching is carried out for 3 hours. The obtained pulp After filtering, leach residue A and leach solution B are obtained;

[0057] (2) sending leach solution B into the second leaching kettle;

[0058] (3) According to ore sample 2 # and sample 4 # The composition of the leaching solution B, the free acid content of the leaching solution B and the amount of acid that can be released by iron deposition in the leaching solution B, determine the # The addition amount is ore sample 2 # 1.5 times; the ore sample 4 # The water-based pulp (solid-to-liquid mass ratio is 1:10) is divided into 3 shares and added to the second leaching tank for leaching, and the addition and leaching are performed according to the following conditions: first add the first ...

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Abstract

The invention discloses an improved method for processing high-iron and high-magnesium a laterite and obtaining a hematite product. The method comprises the following steps of: dividing laterite ores into high-iron ores and high-magnesium ores; leaching the high-iron ore at a normal pressure and filtering to obtain leaching slag A for later use, putting leaching liquor B in a second leaching kettle; determining the addition of the high-magnesium ore, inputting water-based ore pulp in the second leaching kettle in batch, leaching at 120-180 DEG C; filtering the ore pulp discharged from the second leaching kettle, magnetically separating the obtained leaching slag C, wherein the magnetic part solid is collected as the hematite product, and the non-magnetic part solid and the leaching slag A are combined to be used for recycling silicone products; and sending the obtained leaching liquor D into a recovery process of nickel, cobalt, aluminum and magnesium. By the method, a high nickel-cobalt leaching rate is obtained, efficient separation of nickel-cobalt, iron and silicone is realized, and the hematite product is obtained; and moreover, acid consumption, energy consumption and equipment investment cost in a production process are low.

Description

technical field [0001] The invention relates to a nickel ore smelting method, in particular to an improved method for processing laterite ore with high iron and high magnesium content and obtaining hematite products. Background technique [0002] Laterite ores around the world are mainly divided into two categories: limonite-based laterites and silicate minerals-based laterites. The former has higher iron content and lower magnesium content, while the latter has higher magnesium content and lower iron content. Low. There are also some ores with similar iron and magnesium contents. The smelting technology of laterite ore is mainly divided into two types: fire method and wet method. Pyrometallurgy has the disadvantage of not being able to recover cobalt, and is mainly used to produce ferronickel from laterite ore with low iron content; hydrometallurgy can extract nickel, cobalt, iron, magnesium and other metals in laterite ore at the same time, so in laterite ore Occupy an ...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/44
CPCY02P10/20
Inventor 刘葵陈星新
Owner GUANGXI NORMAL UNIV
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