Normal-pressure leaching method for simultaneously processing laterites with high iron content and high magnesium content

A simultaneous processing and laterite ore technology, applied in the field of nickel ore smelting, can solve problems such as long leaching time, difficulty, and environmental pollution, and achieve the effects of simplifying the smelting process, reducing equipment investment costs, and reducing production costs

Inactive Publication Date: 2011-10-05
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Heap leaching technology has a low leaching rate and is only suitable for processing laterite ores with high magnesium content; reduction roasting-ammonia leaching technology is rarely used due to high energy consumption and long process flow; pyrometallurgical technology can only produce ferronickel, Cobalt cannot be recovered and its application is limited
High-pressure acid leaching technology can effectively separate nickel, cobalt and iron, and is especially suitable for the treatment of high-iron and low-magnesium minerals. However, during the leaching process, silicon, aluminum and some iron will be deposited on the wall of the kettle to form scaling, resulting in a decrease in the processing capacity of the autoclave. Scaling must be cleaned regularly during the production process
Atmospheric pressure acid leaching technology is simple to operate and does not require the use of expensive autoclaves. However, it requires a large amount of acid to completely dissolve the minerals, and the leachate contains various metal ions, which complicates the subsequent leaching and separation process.
[0003] In order to develop laterite resources with high iron and high magnesium content at the same time, and to avoid the use of expensive autoclaves, some improved atmospheric pressure acid leaching techniques have been proposed, such as the invention patent with the publication number CN101273146A, which proposes the simultaneous extraction of limonite and saprolite or a two-step normal-pressure leaching method for leaching saprol

Method used

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  • Normal-pressure leaching method for simultaneously processing laterites with high iron content and high magnesium content
  • Normal-pressure leaching method for simultaneously processing laterites with high iron content and high magnesium content
  • Normal-pressure leaching method for simultaneously processing laterites with high iron content and high magnesium content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) the ore sample 1 # The aqueous ore slurry (solid-to-liquid mass ratio is 1:15) is added into the first acid leaching tank (it can be an atmospheric pressure stirring tank, the same below), and after adding 93% (w / w) sulfuric acid, the temperature is raised to 95 ° C, and leached for 1 hour, the obtained After the pulp is filtered, two parts are obtained: leaching slag A and leaching solution B;

[0037] (2) Leaching solution B is sent into the second acid leaching tank (can be an atmospheric pressure stirring tank, the same below), and the ore sample 3 # Added to the tank (mine sample 3 # The addition amount is ore sample 1 # 1.5 times, add ore sample 3 # Finally, the pH value of the leach solution B is 1.2), react at 100°C for 30 minutes, and filter the obtained pulp to obtain the leach residue C and the leach solution D;

[0038](3) Carry out magnetic separation to leaching slag C, obtain magnetic part E and non-magnetic part F, magnetic part E is sold as iron...

Embodiment 2

[0044] (1) the ore sample 1 # The aqueous pulp (solid-to-liquid mass ratio is 1:18) is added to the first acid leaching tank, after adding 93% (w / w) sulfuric acid, the temperature is raised to 80°C, and leached for 3 hours, and the obtained pulp is filtered to obtain leaching slag A and leaching solution B two parts;

[0045] (2) The leach solution B is sent into the second acid leaching tank, and the ore sample 3 # Added to the tank (mine sample 3 # The addition amount is ore sample 1 # 2 times, add ore sample 3 # Finally, the pH value of the leachate B is 2.5), react at 80°C for 1.5h, and filter the obtained pulp to obtain the leach residue C and the leachate D;

[0046] (3) Carry out magnetic separation to leaching slag C, obtain magnetic part E and non-magnetic part F, magnetic part E is sold as iron product, and non-magnetic part F is combined with leaching slag A for recycling silicon product;

[0047] (4) Get 80% of the leach solution D as a supplementary leaching ...

Embodiment 3

[0052] (1) the ore sample 2 # The aqueous pulp (solid-to-liquid mass ratio is 1:20) is added to the first acid leaching tank, after adding 98% (w / w) sulfuric acid, the temperature is raised to 100°C, and the leaching is performed for 0.5h. The obtained pulp is filtered to obtain leaching residue A and leaching liquid B two parts;

[0053] (2) The leach solution B is sent into the second acid leaching tank, and the ore sample 3 # Added to the tank (mine sample 3 # The addition amount is ore sample 2 # 2.5 times, add ore sample 3 # Finally, the pH value of the leachate B is 3.2), react at 75°C for 2.5h, and filter the obtained pulp to obtain the leach residue C and the leachate D;

[0054] (3) Carry out magnetic separation to leaching slag C, obtain magnetic part E and non-magnetic part F, magnetic part E is sold as iron product, and non-magnetic part F is combined with leaching slag A for recycling silicon product;

[0055] (4) Get 50% of the leaching solution D as a suppl...

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Abstract

The invention discloses a normal-pressure leaching method simultaneously processing laterites with high iron content and high magnesium content, comprising the following steps of: screening the laterites with high iron content and high magnesium content; adding sulfuric acid to the laterite with high iron content for leaching so as to obtain leaching residue A and a leaching solution B; adding the laterite with high magnesium content to the leaching solution B, leaching to obtain leaching residue C and a leaching solution D; carrying out magnetic separation on the leaching residue C, wherein a magnetic part E is recovered as an iron product, and a non-magnetic part F and the leaching residue A are mixed to be used for recovering silicon products; delivering a part of the leaching solutionD into a purifying and recovering process, and returning the other part of the leaching solution D into the leaching process of the laterite with high iron content, and carrying out a next leaching period; repeating the leaching period for 4-5 times, and completely delivering a leaching solution I obtained from a last leaching period into the recovering processes of nickel, cobalt, aluminum and magnesium. The normal-pressure leaching method has the advantages of low cost and acid consumption and high leaching efficiency of the nickel and the cobalt and realizes the efficient separation and the recycling of iron, silicon, the nickel and the cobalt and the discharge without acid liquor.

Description

technical field [0001] The invention relates to a nickel ore smelting method, in particular to an atmospheric pressure leaching method for simultaneously processing high-iron and high-magnesium content laterite ore. Background technique [0002] Laterite ore is a nickel oxide ore formed by nickel-bearing peridotite after large-scale long-term weathering and leaching metamorphism in tropical or subtropical regions. Due to differences in geographical location, climatic conditions and weathering degrees, the types of laterite ore around the world are not completely the same . Limonite-based laterite ores usually have higher iron content and lower magnesium content, and laterite ores mainly composed of silicate minerals have higher magnesium content and lower iron content. Laterite ore mainly composed of silicate minerals should be treated by pyrometallurgy, limonite-type ore deposits should be treated by hydrometallurgy, and intermediate transitional ores can be treated by pyr...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B23/00C22B26/22C22B21/00C01G49/02
CPCY02P10/20
Inventor 刘葵
Owner GUANGXI NORMAL UNIV
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