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Method for extracting valuable metals from laterite nickel mine with hydrochloric acid full-closed circulation method

A laterite nickel ore and closed-circuit circulation technology, which is applied in chemical instruments and methods, improvement of process efficiency, solid separation, etc., can solve problems such as high energy consumption, low equipment capacity, and high cost of hydrochloric acid regeneration, so as to reduce acid consumption and equipment The effect of reducing investment and maintenance costs and improving comprehensive utilization value

Active Publication Date: 2009-08-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current hydrochloric acid regeneration process, the mother liquor after nickel precipitation is generally concentrated and then directly roasted at high temperature, which has problems such as high energy consumption and low equipment capacity, which makes the hydrochloric acid regeneration cost very high.

Method used

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  • Method for extracting valuable metals from laterite nickel mine with hydrochloric acid full-closed circulation method
  • Method for extracting valuable metals from laterite nickel mine with hydrochloric acid full-closed circulation method
  • Method for extracting valuable metals from laterite nickel mine with hydrochloric acid full-closed circulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] (1) Leaching

[0092] A. Add water according to the material-to-water ratio of 1:2 (wt) to ball mill the laterite nickel ore and pass it through a 100-mesh sieve. Take -100 mesh slurry and pump it into the pressure reactor, pump water and chloride leaching agent (HCl content above 28%, magnesium ion The sum of iron ion content: the content of chloride ion is 0.05:1 (wt)), stirring and leaching.

[0093] B. Control of leaching conditions: stirring and leaching for 2 hours at 150° C. (maximum pressure control is 0.3 MPa).

[0094] C. Filter while hot and wash the residue. The comprehensive leaching rates of valuable metals are: Ni+Co 95.8%; Mg 95.0%; Fe4.6%.

[0095] After pressure leaching of laterite nickel ore with chloride, the contents of nickel and cobalt in the leaching solution (g / L) are: Ni+Co 2.27; Mg33.5 Fe2.16; the acidity of the leaching solution is: H + 0.82mol / L. The following examples are based on this leachate.

[0096] The valuable metal components...

Embodiment 2

[0110]Carry out the extraction and comprehensive utilization of valuable metals in the laterite nickel ore in the same manner as in Example 1, but step (1) wherein is carried out in the following manner:

[0111] A. Add water according to the material-to-water ratio of 1:1 (wt) to ball-mill the laterite nickel ore and pass through a 100-mesh sieve. Get the -100 mesh slurry and pump it into the pressure reactor, and pump water and chloride leaching agent (hydrochloric acid and the mother liquor after extracting nickel and cobalt) into the liquid-solid ratio of 3.0:1 and the leaching agent to material (weight) ratio of 1.4:1. In the mixed solution, the content of HCl is more than 28%, the sum of the content of magnesium ion and iron ion: the content of chloride ion is 0.1:1), stirring and leaching.

[0112] B. Control of leaching conditions: stirring and leaching for 1 hour at 165° C. (maximum pressure control is 0.45 MPa).

[0113] C. Filter while hot and wash the residue. Th...

Embodiment 3

[0115] Carry out the extraction and comprehensive utilization of valuable metals in the laterite nickel ore in the same manner as in Example 1, but step (1) wherein is carried out in the following manner:

[0116] D. Add water according to the material-to-water ratio of 1:1 (wt) to ball-mill the laterite nickel ore and pass through a 100-mesh sieve. Get the -100 mesh slurry and pump it into the pressure reactor, and pump water and chloride leaching agent (magnesium chloride, chlorine, etc. The mixed solution of ferric chloride and hydrochloric acid, the content of HCl is more than 28%, the sum of the content of magnesium ion and iron ion: the content of chloride ion is 0.3:1), stirring and leaching.

[0117] E. Control of leaching conditions: stirring and leaching for 0.5 hours at 180° C. (maximum pressure control is 0.5 MPa).

[0118] F. Filtrate while hot and wash the residue. The comprehensive leaching rates of valuable metals are: Ni+Co 96.1%; Mg 95.6%; Fe 3.1%.

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Abstract

A method for extracting valuable metals from laterite nickel ore on the basis of the hydrochloric acid fully-closed circulation method belongs to the field of non-ferrous metallurgy. Crushed laterite nickel minerals are taken as raw material and the technique comprises the following technological steps: chlorination-leaching; recovering iron (Fe) from leaching residue; extracting nickel (Ni) and cobalt (Co); spray-drying the mother liquor; and calcining. By leaching the laterite nickel minerals with a mixed solution of hydrochloric acid and metal chlorides as a leaching agent under the proper conditions of heating and pressurizing and further precipitating nickel and cobalt with a compound vulcanizing agent, the overall recovery rate of nickel and cobalt is high; the closed circulation of hydrochloric acid is realized while processing the laterite nickel minerals with water and hydrochloric acid, therefore, the method is environment-friendly by realizing the zero discharge of waste water; comprehensive utilization of the resources, such as Ni, Co, Fe and Mg, in the laterite nickel ore can be realized; and the resources can be efficiently utilized and the clean production can be realized by recovering and reutilizing the waste heat and the residue acid during the production.

Description

technical field [0001] The invention relates to a method for extracting nickel and cobalt metals from laterite nickel ore and comprehensively utilizing valuable metals such as magnesium and iron, belonging to the field of nonferrous metallurgy. Background technique [0002] Laterite nickel ore is a kind of nickel oxide ore, accounting for more than 65% of the total nickel reserves. Lateritic nickel ore is divided into limonite type and silicon magnesium nickel ore type. The limonite type is located in the upper part of the deposit, with high iron, low nickel, low silicon and magnesium, but relatively high cobalt content, and should be treated by hydrometallurgy. The silicon-magnesium-nickel ore is located in the lower part of the ore deposit. The content of silicon and magnesium is relatively high, the content of iron is low, and the content of cobalt is also low, but the content of nickel is relatively high. It should be treated by pyrometallurgy. The ore in the middle tr...

Claims

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Application Information

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IPC IPC(8): C22B3/10C22B3/26B03C1/015B03C1/02C22B23/00
CPCC22B3/10C22B23/0423C22B23/0461Y02P10/20
Inventor 李新海郭华军胡启阳王志兴彭文杰张云河李向群
Owner CENT SOUTH UNIV
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