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Method for processing enrichment of laterite-nickel ore in form of ferronickel by microwave

A lateritic nickel ore and microwave treatment technology, which is applied in the field of mineral processing, can solve problems such as environmental pollution and multi-equipment investment costs, achieve the effects of shortening the reaction time, eliminating the step of powder ore agglomeration, and improving the total recovery rate

Inactive Publication Date: 2012-05-23
湖南长拓高科冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention adds a certain amount of carbonaceous reducing agent and utilizes selective reduction. This method not only requires the reduction of nickel in the ore, but also requires controlling the reduction of iron to stay at the magnetite stage instead of continuing the reduction. It is difficult to do it in actual industrial application, and this method of using acid leaching will lead to an increase in equipment investment costs, and the consumed acid will cause environmental pollution problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: lateritic nickel ore of magnesia-nickel ore type, the composition is Ni1.74%, Fe12.29%. The laterite nickel ore is dried to a moisture content of 15%, initially crushed to -3mm, and the coarsely broken minerals are mixed with activated carbon reducing agent to a particle size of -200 mesh, and the amount of activated carbon reducing agent is 7.5%. Then the mixed ore is directly added to the intermittent industrial microwave oven for reduction roasting, using a weakly reducing gas (85% of which is argon and 15% of hydrogen) as the reaction atmosphere, and roasting at 1100°C for 0.25h. Water quenching is performed directly after calcination, and wet ball milling is used for water quenching ore, and the grinding particle size is -200 mesh, accounting for more than 50%. The form of magnetic separation is two-step magnetic separation, the first step is weak magnetic separation, the slurry is controlled to 20%, the magnetic field strength is 1300GS, and concentrate...

Embodiment 2

[0030] Example 2: lateritic nickel ore of magnesia-nickel ore type, the composition is Ni1.74%, Fe12.29%. The laterite nickel ore is dried to a moisture content of 12% and coarsely crushed to -3mm. Coarsely crushed minerals and bituminous coal reducing agent are mixed and ground to a particle size of -100 mesh, and the amount of bituminous coal reducing agent is 16%, and then the mixed ore is directly added to an intermittent industrial microwave oven for reduction roasting, using a weak reducing gas (including argon Gas accounted for 95%, carbon monoxide accounted for 5%) as a gas atmosphere, roasted at 1200 ℃ for 0.5h. The calcined sand is directly water-quenched, and the water-quenched ore is wet-type ball milled, and the grinding particle size is -200 mesh, accounting for more than 80%. The form of magnetic separation is two-step magnetic separation, the first step is weak magnetic separation, the slurry is controlled to 40%, the magnetic field strength is 1400GS, and con...

Embodiment 3

[0031] Example 3: lateritic nickel ore of magnesia-nickel ore type, the composition is Ni1.74%, Fe12.29%. The lateritic nickel ore is dried to a moisture content of less than 10%, and coarsely crushed to -3mm. Coarsely crushed minerals and anthracite reducing agent are mixed and ground to a particle size of -150 mesh, and the amount of anthracite reducing agent is 16%, and then the mixed ore is directly added to a continuous industrial microwave oven for reduction roasting, using argon as a protective atmosphere. Calcined at 1100°C for 2h. The calcined sand is directly water-quenched, and the water-quenched ore is wet-type ball milled, and the grinding particle size is -200 mesh, accounting for more than 60%. The form of magnetic separation is two-step magnetic separation. The first step is weak magnetic separation. The slurry is controlled to 20% and the magnetic field strength is 1400GS to obtain concentrate and tailings. The second step is to carry out strong magnetic sep...

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PUM

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Abstract

The invention provides a method for processing enrichment of laterite-nickel ore in a form of ferronickel by microwave, which comprises the steps of drying, mixed grinding, roasting, water quenching, wet grinding and magnetic concentrating, wherein in the roasting process, mixed grinding materials are added in a microwave device for direct reduction roasting under the condition of inert atmosphere or weak reduction atmosphere, the roasting temperature is 900 DEG C-1280 DEG C and the reduction time is 0.2 hour-2 hours; and in the magnetic concentrating process, weak magnetic concentrating is carried out on wet grinding materials in the condition of magnetic field intensity of 1000GS-1400GS to obtain concentrate and tailings, strong magnetic concentrating is carried out on the tailings subjected to the weak magnetic concentrating in the condition of the magnetic field intensity of 3000GS-8000GS, and the concentration of ore pulp after magnetic concentrating is 20%-40%. In the invention,the laterite-nickel ore in the form of ferronickel is fully enriched by using a microwave roasting catalytic reduction method, and then high grade ferronickel ore concentrate in the mode of low-cost magnetic concentrating is obtained.

Description

technical field [0001] The invention belongs to the field of mineral processing, in particular to a method for enriching ferronickel by treating laterite nickel ore with microwaves. Background technique [0002] Nickel is a very important and widely used metal element. It is often combined with other metals to form stainless steel, alloy steel and non-ferrous high-temperature alloys. It is also used in electroplating, catalysts, ceramics and magnets, and occupies an important role in industrial production. status. [0003] Nickel is mainly smelted from nickel sulfide ore. The nickel sulfide ore extraction process is mature, and the long-term large-scale mining has made the world's nickel sulfide ore resources available for development are limited. In addition, the nickel sulfide ore resources have a long exploration cycle and construction cycle, making development and utilization relatively difficult. Contrary to the situation of nickel sulfide ore, laterite nickel ore i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/00C22B1/02B03C1/025C22B23/00
Inventor 彭虎胡正夏广斌
Owner 湖南长拓高科冶金有限公司