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Process for abstracting nickel and cobalt by using wet method to chloridize laterite-nickel ore

A technology of lateritic nickel ore and nickel-cobalt, which is applied in the direction of improving process efficiency, can solve the problems of unqualified environmental protection process, small production scale, and high environmental protection pressure, so as to improve leaching efficiency and hydrochloric acid utilization rate, and eliminate system expansion phenomenon , the effect of enhanced reactivity

Inactive Publication Date: 2008-10-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large investment and high cost of the pressurized sulfuric acid method, there are problems such as low leaching rate, magnesium cannot be opened, and environmental protection pressure is high.
Most of the laterite nickel ore in my country is high-iron and low-grade nickel ore. At present, the technology and equipment for extracting nickel and cobalt from laterite nickel ore in my country are relatively backward, and the production scale is also small. nickel ore demand

Method used

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  • Process for abstracting nickel and cobalt by using wet method to chloridize laterite-nickel ore
  • Process for abstracting nickel and cobalt by using wet method to chloridize laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The laterite nickel ore is ball milled and passed through a 50-mesh sieve, and a -50-mesh ore sample is taken for leaching.

[0032] The chloride leaching agent used is a mixed solution of magnesium chloride, ferrous chloride and hydrochloric acid, in which the sum of the content of magnesium ion and iron ion: the content of chloride ion is 0.02:1 (mass ratio).

[0033] According to the liquid-solid ratio 5:1, Cl - The mass ratio to the material is 1.4, add water and chloride leaching agent respectively, heat up to 50°C and stir for 1 hour; then heat up to 70°C and stir for 1 hour; then heat up to 90°C and stir for 1 hour, the total leaching time is controlled 3 hours. Filter while hot to obtain leaching residue and leaching liquid.

[0034] The residue was analyzed, and it was determined that the nickel leaching rate was 89.12% and the cobalt leaching rate was 94.15%.

Embodiment 2

[0036] The laterite nickel ore is ball milled and passed through a 50-mesh sieve, and a -50-mesh ore sample is taken for leaching.

[0037] The chloride leaching agent used is a mixed solution of magnesium chloride, ferrous chloride and hydrochloric acid, in which the sum of the content of magnesium ions and iron ions: the content of chloride ions is 0.1:1 (mass ratio).

[0038] According to the liquid-solid ratio 5:1, Cl - The mass ratio to the material is 1.4, add water and chloride leaching agent respectively, heat up to 50°C and stir for 1 hour; then heat up to 70°C and stir for 1 hour; then heat up to 90°C and stir for 1 hour, the total leaching time is controlled 3 hours. Filter while hot to obtain leaching residue and leaching liquid.

[0039] The residue was analyzed, and it was determined that the nickel leaching rate was 90.23% and the cobalt leaching rate was 94.36%.

Embodiment 3

[0041] The laterite nickel ore is ball milled and passed through a 50-mesh sieve, and a -50-mesh ore sample is taken for leaching.

[0042] The chloride leaching agent used is a mixed solution of ferric chloride, calcium chloride, aluminum chloride and hydrochloric acid, in which the sum of iron ion, calcium ion and aluminum ion content: the content of chloride ion is 0.3:1 (mass ratio).

[0043] According to the liquid-solid ratio 5:1, Cl - The mass ratio to the material is 1.4, add water and chloride leaching agent respectively, heat up to 50°C and stir for 1 hour; then heat up to 70°C and stir for 1 hour; then heat up to 90°C and stir for 1 hour, the total leaching time is controlled 3 hours. Filter while hot to obtain leaching residue and leaching liquid.

[0044] The residue was analyzed and it was determined that the nickel leaching rate was 89.01% and the cobalt leaching rate was 94.03%.

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Abstract

The invention relates to a method for extracting nickel and cobalt from a laterite-nickel ore, comprising the following steps of mineral preparation, chloride leaching, solid-liquid separation, leaching liquid concentration, sulfide precipitation, solid-liquid separation and hydrochloric acid recovery of the laterite-nickel ore. A chloride leaching agent is mixing solution of metal chloride and hydrochloric acid; the leaching liquid is concentrated by heating; ferric chloride and magnesium chloride are crystallized and separated out so that Fe / Ni ratio is reduced below 1 / 5 of Fe / Ni ratio before the concentration; the magnesium oxide or the ferric oxide generated in the hydrochloric acid recovery process is used as neutralizer; polysulfide, just precipitated metal sulfide and metal sulfide are used as sulfuration precipitator; mother liquor with precipitated nickel is roasted with the ferric chloride and the magnesium chloride which are obtained by concentrating the leaching liquid; the metal chloride in the mother liquor and the metal chloride obtained from the concentration are hydrolyzed into chlorine hydride and metal oxide; and the obtained acid is recycled to use. The method for extracting nickel and cobalt from the laterite-nickel ore improves the leaching rate of valuable metals such as nickel, cobalt and so on in the leaching process of the laterite-nickel ore, reduces the energy consumption and is environment friendly.

Description

Technical field: [0001] The invention relates to a method for extracting nickel and cobalt from Hongdi nickel ore, and belongs to the field of non-ferrous metallurgy. Background technique: [0002] Laterite nickel ore is a kind of nickel oxide ore, accounting for more than 65% of the total nickel reserves. Laterite nickel ore is divided into two categories: limonite type and magnesia nickel type. The type of limonite is located in the upper part of the deposit, with high iron, low nickel, low silicon and magnesium, but relatively high cobalt content, so it is appropriate to use hydrometallurgical processing. The silicon-magnesium-nickel ore is located in the lower part of the deposit. The content of silicon and magnesium is relatively high, the content of iron is relatively low, and the content of cobalt is relatively low, but the content of nickel is relatively high, so it should be treated by pyrometallurgical process. The ore in the intermediate transition can adopt pyrometall...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B3/10
CPCY02P10/20
Inventor 李新海郭华军胡启阳王志兴彭文杰张云河刘久清
Owner CENT SOUTH UNIV
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