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Magnetic separation method for gathering rich nickel and cobalt from chloridized and separated low-grade laterite

A laterite ore, low-grade technology, used in chemical instruments and methods, magnetic separation, solid separation, etc.

Active Publication Date: 2011-12-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the recent rise of the chlorination separation-magnetic separation process, only a simple magnetic separation treatment is performed on the laterite ore after chlorination separation, and there is no report on adding magnetic seeds to magnetic separation

Method used

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  • Magnetic separation method for gathering rich nickel and cobalt from chloridized and separated low-grade laterite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A. 500kg of segregated laterite ore is wet-milled, its grade: Ni 1.45%, Co 0.05, Fe 11%, Ca 12.3%, Mg 13.2%. Then pass through a 300-mesh sieve, put it into a mixing tank after sieving, and add water to the amount that the mass percentage concentration of the slurry that needs to be reached is 50%.

[0022] B. Add sodium hydroxide solution to the prepared slurry solution to adjust the pH value of the solution to 6, and add 20 g of sodium hexametaphosphate.

[0023] C. Put 1 kg of magnetite (particle size < 1 micron) into the mixing bucket, and stir continuously for 5 minutes, and the rotating speed of the mixing bucket is 800rpm.

[0024] D. Put the stirred slurry into the magnetic separator with a mortar pump. The magnetic separator is a permanent magnetic roller strong magnetic separator with a surface magnetic field strength of 0.23T. Control the flow rate of the feed pipe and the water inlet pipe so that the slurry entering the magnetic separator is diluted to 10%....

Embodiment 2

[0027] A. 500kg of segregated laterite ore is wet-milled, its grade: Ni 1.30%, Co 0.08, Fe 20.11%, Ca 14.50%, Mg 10.2%. Then pass through a 300-mesh sieve, put it into a mixing tank after sieving, and add water in an amount of 50% of the slurry mass percentage concentration that needs to be achieved.

[0028] B. Add sodium hydroxide solution to adjust the slurry solution to adjust the pH value of the solution to 7, and add 25 g of sodium hexametaphosphate.

[0029] C. Put 1 kg of magnetite (particle size < 1 micron) into the mixing bucket, and keep stirring for 5 minutes. The rotating speed of the mixing bucket is 700rpm.

[0030] D. Pump the stirred slurry onto the magnetic separator with a mortar pump. The magnetic separator is a permanent magnetic roller strong magnetic separator with a surface magnetic field strength of 0.24T. Control the flow rate of the feed pipe and the water inlet pipe so that the slurry entering the magnetic separator is diluted to 15%.

[0031] Thr...

Embodiment 3

[0033] A. 500kg of segregated laterite ore is wet-milled, its grade: Ni 1.35%, Co 0.14, Fe 11.20%, Ca 10.50%, Mg 6.32%. Then pass through a 300-mesh sieve, put it into a mixing tank after sieving, and add water in an amount of 50% of the slurry mass percentage concentration that needs to be achieved.

[0034] B. Add sodium hydroxide solution to the prepared slurry solution to adjust the pH value of the solution to 7.5, and add 30 g of sodium hexametaphosphate.

[0035] C. Put 1 kg of magnetite (particle size < 1 micron) into the mixing bucket, stir continuously for 3 minutes, and the rotating speed of the mixing bucket is 800rpm.

[0036] D. Put the stirred slurry on the magnetic separator with a mortar pump, and the magnetic separator is a permanent magnetic roller strong magnetic separator with a surface magnetic field strength of 0.23T. Control the flow rate of the feed pipe and the water inlet pipe so that the slurry entering the magnetic separator is diluted to 10%.

[...

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Abstract

The invention discloses a magnetic separation method for gathering rich nickel and cobalt from chloridized and separated low-grade laterite, comprising the following steps of: carrying out wet grinding and sieving on the chloridized and separated low-grade laterite, and then adding water and a modifier to carry out size mixing; then adding magnetic seeds to be stirred for a period of time; and adding water for diluting, and then carrying out magnetic separation on a permanent-magnetic roller strong magnetic separator, wherein obtained ore concentrates are nickel and cobalt rich products. Compared with the prior art, the magnetic separation method enhances the yield of the nickel and the cobalt and the grades of the ore concentrates, thereby enhancing the economic benefit; in addition, theinvention solves the problems of lower grade and low nickel yield of the ore concentrates obtained by chloridizing and separating the low-grade laterite, the yield of the nickel is more than 90 percent, and the yield of the cobaltis is more than 80 percent.

Description

technical field [0001] The invention relates to the fields of nonferrous hydrometallurgy and mineral processing, in particular to a method for extracting nickel and cobalt from chlorinated and isolated low-grade laterite ore. Background technique [0002] There are two types of nickel resources that can be mined in the world: one is nickel sulfide ore, accounting for 40% of land nickel resources, and the other is nickel oxide ore (commonly known as laterite nickel ore), accounting for 60%. However, 55% of nickel products in the world are extracted from nickel sulfide ore, and less than 45% of nickel is extracted from laterite ore. However, with continuous mining, nickel sulfide ore is getting less and less, and the grade is getting lower and lower. Laterite ore has been considered as the main nickel resource to be developed in the future. [0003] The grades of nickel and cobalt in laterite ore are relatively low, especially for low-grade laterite ore, which is not suitable...

Claims

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Application Information

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IPC IPC(8): B03C1/02B03C1/005
Inventor 李新海张琏鑫胡启阳王志兴郭华军刘婉蓉李金辉
Owner CENT SOUTH UNIV
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