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Process for comprehensively developing and utilizing nickel, cobalt, iron and magnesium from laterite-nickel ore

A technology of lateritic nickel ore and nickel-cobalt, which is applied in the direction of improving process efficiency, etc., can solve the problems of insufficient comprehensive utilization of resources and poor versatility, and achieve the effects of low cost, wide application range and complete scheme

Inactive Publication Date: 2009-01-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the poor versatility and insufficient comprehensive utilization of resources in the prior art, the present invention provides a low-investment, comprehensive utilization of resources, wide application range of minerals, simple process, low energy consumption, low production cost, and acid and water closed circuit circulation. A method for comprehensive development and utilization of nickel, cobalt, iron and magnesium in laterite nickel ore that is environmentally friendly and adaptable to large-scale production

Method used

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  • Process for comprehensively developing and utilizing nickel, cobalt, iron and magnesium from laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051]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. Take the -100 mesh slurry and pump it into the pressure reactor, pump water and hydrochloric acid (HCl content above 28%) respectively according to the liquid-solid ratio of 3.0:1 and the acid material (weight) ratio of 1.2:1, and stir for leaching.

[0052] B. Control of leaching conditions: stirring and leaching for 0.5 hours at 165°C (pressure not greater than 0.5MPa).

[0053] C. Filter while hot and wash the residue. The comprehensive leaching rates of valuable metals are: Ni+Co 92.1%; Mg 94.6%; Fe 3.1%.

Embodiment 2

[0055] A. Add water according to the material-to-water ratio of 1:2 (wt) to ball-mill the laterite nickel ore and pass through a 100-mesh sieve. Take -100 mesh slurry and pump it into the pressure reactor, pump water and hydrochloric acid (HCl content above 28%) respectively according to the liquid-solid ratio of 4.0:1 and the acid material (weight) ratio of 1.5:1, and stir for leaching.

[0056] B. Control of leaching conditions: stirring and leaching for 2 hours at 150°C (pressure greater than 0.35MPa).

[0057] C. Filter while hot and wash the residue. The comprehensive leaching rates of valuable metals are: Ni+Co 91.4%; Mg 95.2%; Fe 5.7%.

[0058] The laterite nickel ore is leached with hydrochloric acid under pressure. The contents of nickel and cobalt in the leaching solution (g / L) are: Ni+Co 2.27; Mg 33.5Fe2.16; the acidity of the leaching solution is: H + 0.82mol / L. The following examples are based on this leachate.

[0059] The valuable metal components (%) of th...

Embodiment 3

[0061] A. Pelletizing: Mix the water-containing leached slag, composite binder and reducing agent evenly, and granulate with a disc granulator. The composite binder is 80% sodium humate + 10% quicklime + 10% sodium carbonate, and the dosage is 3% of the dry weight of the leaching residue; the reducing agent is bituminous coal, and the dosage is 10% of the dry weight of the leaching residue.

[0062] B. Magnetization roasting: put the raw balls into the reduction roasting rotary kiln, the roasting temperature is 700°C, and the roasting time is 40 minutes.

[0063] C. Magnetic separation: the reduced cooked balls are crushed, ball milled, and passed through a 200-mesh sieve; the -200-mesh powder is magnetically separated with a weak magnetic separator, and the magnetic field strength of the magnetic separation is 100 Tesla; the iron content of the magnetic separation product is 58.4%; The iron yield was 76.3%.

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Abstract

The invention relates to a method for compressively developing and utilizing nickel and cobalt in a lateritic nickel ore. The lateritic nickel ore is used as the raw material; the technical flows of mining, defibrination and ore preparation, pressurizing and wet chlorinating extraction, separating the nickel (cobalt) and iron by extraction, hydrolyzing magnesium chloride with a high temperature, magnetizing and roasting the extracted slag, magnetically separating, etc., and the like, are adopted to extract the middle product of the nickel and cobalt, recycle the light magnesium chloride and the materials used for pudding. The invention is mainly characterized in that the nickel and cobalt in the lateritic nickel ore is firstly and selectively dissolved and extracted by using the pressurized muriatic acid; a depositing method is used on the nickel and cobalt in a liquid to obtain the middle product; the mother liquid after the nickel is deposited is hydrolyzed by high temperature to obtain the light magnesium chloride and the chlorine hydride is recycled to obtain the muriatic acid; a material used for pudding is obtained after the extracted slag is reduced, magnetized, roasted and weakly separated in a magnetic way; the recycling muriatic acid enters the working period of extraction, thereby leading the muriatic acid to closely circulate. The method of the invention comprehensively recycles nickel and cobalt, magnesium and iron and has the advantages of high nickel and cobalt extraction rate, low cost, less investment and closed muriatic acid circulation. The whole technique is simple, clean, environmental friendly and is applicable for industrial production with large scale in particular.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal hydrometallurgy, a process method for extracting nickel and cobalt from laterite nickel ore by wet chlorination and comprehensively utilizing magnesium and iron, especially a process for processing low-grade laterite nickel ore and comprehensively utilizing valuable metal method. Background technique [0002] The types of nickel resources are usually divided into two types: nickel sulfide ore and nickel oxide ore. From a global perspective, currently about 70% of nickel is extracted from nickel sulfide ore, but nickel in oxide ore accounts for 65-70% of the total reserves. With the gradual reduction of nickel sulfide resources and high-grade laterite nickel ore resources, the economic development of a large number of laterite nickel ore with a grade of about 1% has been paid more and more attention by people. [0003] According to the content of iron and magnesium in the ore, nickel-bearing late...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B26/22C22B3/10C22B3/26C22B1/02
CPCY02P10/20
Inventor 胡启阳李新海王志兴郭华军
Owner CENT SOUTH UNIV
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