Method for treating limonite type oxidized nickel ore by roasting and leaching

A technology of nickel oxide ore and limonite, applied in the field of mineral processing, can solve problems such as acid consumption, achieve the effects of improving processing efficiency, stabilizing the properties of leaching slag, and improving energy utilization efficiency

Inactive Publication Date: 2011-10-05
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, calcium, magnesium, aluminum, etc. in the raw ore will also be partially leached, resulting in acid consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The process steps of the roasting-leaching method for treating limonite-type nickel oxide ore are as follows.

[0029] (1) Crush and grind the limonite-type nickel oxide ore, and the mass percentage of the ore powder with a particle size of ≤0.15 mm after grinding is 71% of the total ore powder.

[0030] (2) Mix the finely ground mineral powder with a carbon-containing reducing agent to make pellets with a diameter of 8 mm; dry at a temperature of 220° C. until the water content is 10% (mass percentage).

[0031] The carbon-containing reducing agent is activated carbon, and the reducing agent with a particle size of ≤0.15mm accounts for 52% of the total reducing agent by mass; according to the mass ratio, the amount of the reducing agent is 6% of the mineral powder.

[0032] (3) Put the above-mentioned dried pellets into a roasting furnace, and carry out reduction roasting at a temperature of 920° C. for 60 minutes to reduce the nickel, cobalt and a small amount of iron...

Embodiment 2

[0038] The process steps of the roasting-leaching method for treating limonite-type nickel oxide ore are as follows.

[0039] (1) Crushing and grinding the limonite-type nickel oxide ore, and the mass percentage of the ore powder with a particle size of ≤0.15mm after grinding is 75% of the total ore powder.

[0040](2) Mix the ground mineral powder with a carbon-containing reducing agent to make pellets with a diameter of 10 mm; dry at 300° C. until the water content is 8% (mass percentage).

[0041] The carbon-containing reducing agent is activated carbon, and the reducing agent with a particle size of ≤0.15mm accounts for 70% of the total reducing agent by mass; according to the mass ratio, the amount of the reducing agent is 8% of the mineral powder.

[0042] (3) Put the above-mentioned dried pellets into a roasting furnace, and carry out reduction roasting at a temperature of 680° C. for 100 minutes to reduce nickel, cobalt and a small amount of iron in the nickel oxide or...

Embodiment 3

[0048] The process steps of the roasting-leaching method for treating limonite-type nickel oxide ore are as follows.

[0049] (1) Crushing and grinding the limonite-type nickel oxide ore, and the mass percentage of the ore powder with a particle size of ≤0.15mm after grinding is 80% of the total ore powder.

[0050] (2) Mix the ground mineral powder with a carbon-containing reducing agent to make pellets with a diameter of 5 mm; dry at a temperature of 150° C. until the water content is 5% (mass percentage).

[0051] The carbon-containing reducing agent is coke, and the reducing agent with a particle size of ≤0.15mm accounts for 82% of the total reducing agent by mass; according to the mass ratio, the amount of the reducing agent is 10% of the mineral powder.

[0052] (3) Put the above-mentioned dried pellets into a roasting furnace, and carry out reduction roasting at a temperature of 700°C for 150 minutes to reduce nickel, cobalt and a small amount of iron in the nickel oxid...

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Abstract

The invention discloses a method for treating limonite type oxidized nickel ore by roasting and leaching, which comprises the following steps of: crushing and grinding the limonite type oxidized nickel ore, and mixing the limonite type oxidized nickel ore and a carbon-containing reductant; after pelletizing and drying, performing reduction roasting; adding a chlorinating agent into reduced calcine at the roasting temperature of between 300 and 500 DEG C for selective chloridizing roasting; and after cooling, adding chloridized calcine into water to prepare ore pulp, and leaching nickel and cobalt chloride. Compared with the conventional roasting-leaching technology, the method for treating the limonite type oxidized nickel ore by roasting and leaching has the advantages of short flow and low agent consumption, and can effectively recover the nickel and cobalt in the oxidized nickel ore. The leaching residue is easy to utilize comprehensively.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to the processing technology of limonite-type nickel oxide ore. Background technique [0002] At present, the minerals used for large-scale smelting and extraction of nickel mainly include two types: nickel sulfide ore and nickel oxide ore. The amount of nickel (metal) discovered so far in the world is about 70 million tons, of which nickel sulfide ore accounts for about 42%, and the rest is nickel oxide ore. With the decreasing reserves of nickel sulfide ore, nickel oxide ore has become an important nickel resource. Nickel oxide ore is formed by weathering, leaching, alteration and enrichment of nickel-containing rocks. There are two main types of nickel oxide ore: one is limonite type, which generally contains more than 40wt% iron and 0.8-1.5wt% nickel; Low, containing about 2.0wt% nickel. Because the nickel in the nickel oxide ore is chemically dissemin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B1/02C22B3/04
CPCY02P10/20
Inventor 翟秀静符岩范川林畅永锋
Owner NORTHEASTERN UNIV LIAONING
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