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Method for enriching ferronickel by micro treatment on laterite-nickel ore

A technology of laterite nickel ore and microwave treatment, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve problems such as limited reduction effect, achieve good reduction effect, promote migration, improve recovery rate and grade

Inactive Publication Date: 2012-07-04
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

The disadvantage is that the use of pure carbonaceous reducing agent has limited reducing effect, and the enrichment of ferronickel with high grade and high recovery still needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 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%, and coarsely crushed to -3mm. The coarsely broken minerals are mixed with a mixed reducing agent composed of carbonaceous reducing agent and metal powder reducing agent (the active carbon reducing agent is 7.0%, and the metal powder reducing agent zinc is 0.5%) to a particle size of -200 mesh. Then the mixed ore is directly added to the intermittent industrial microwave oven for reduction roasting, and a weak reducing gas (85% of which is argon and 15% of hydrogen) is used as the reaction atmosphere. The first section is kept at a temperature of 700°C for 30 minutes, and the second section is fired at a temperature of 1100°C for 0.25h. The calcined sand is directly water-quenched, and the water-quenched ore is wet-grinded, and the grinding particle size is -200 mesh, accounting for more than 50%. The magneti...

Embodiment 2

[0022] 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. Mix and grind coarsely crushed minerals with carbonaceous reducing agent and metal powder reducing agent (the amount of bituminous coal reducing agent is 7.0%, and the amount of -100 mesh metal powder reducing agent zinc is 1.0%) to a particle size of - 100 mesh, and then directly add the mixed ore into the intermittent industrial microwave oven for reduction roasting, using a weakly reducing gas (95% of which is argon and 5% of carbon monoxide) as the gas atmosphere. The first section is kept at 800°C for 10 minutes, and the second section is fired at 1200°C for 0.5h. The calcined sand is directly water-quenched, and the water-quenched ore is wet-grinded, and the grinding particle size is -200 mesh, accounting for more than 80%. The magnetic separation process is the same as in E...

Embodiment 3

[0023] 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. A mixed reducing agent composed of coarsely crushed minerals, carbonaceous reducing agent and metal powder reducing agent (the amount of anthracite reducing agent is 14.0%, the amount of -100 mesh metal powder reducing agent zinc is 0.5%, -100 mesh reducing agent The amount of aluminum is 1.0%) mixed and ground to a particle size of -150 mesh. Then put the mixed ore directly into the continuous industrial microwave oven for reduction roasting, using argon as the protective atmosphere. The first section was kept at 800°C for 10 minutes, and the second section was fired at 1100°C for 1.5h. The calcined sand is directly water-quenched, and the water-quenched ore is wet-grinded, and the grinding particle size is -200 mesh, accounting for more than 60%. The magnetic separa...

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PUM

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Abstract

The invention relates to a method for enriching ferronickel by carrying out micro treatment on laterite-nickel ore. The following technological steps are sequentially adopted: drying, mixing and grinding, roasting, water quenching, wet grinding and magnetic separating, the method is characterized in that the mixing and grinding process comprises the step of mixing and grinding mixed reducing agent composed of dried mineral aggregate with the moisture content less than or equal to 15%, carbonaceous reducing agent and metal powder reducing agent of minus 100 meshes, and grinding until the granularity is minus 50 meshes; and the roasting process comprises the step of adding mixed grinding material into microwave equipment to be subjected to direct reduction roasting under the condition of inert atmosphere or weak reducing atmosphere, two-stage heat insulation is adopted in the heating process, the temperature in a low-temperature stage is 680-800 DEG C, the time for heat insulation is 10-30 minutes, the temperature in a high-temperature stage is 880-1250 DEG C, and the time for the heat insulation is 0.2-1.5 hours. In the invention, microwave roasting and catalytic reduction are adopted, a mixed reducing agent composed of the carbonaceous reducing agent and metal reducing agent at the price relatively lower than nickel is added, and the recovery rate and grade of nickel in ferronickel concentrate can be improved, thus the method provided by the invention has good economic value and technical practicability.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a method for treating laterite nickel ore to enrich ferronickel by adding a mixed reducing agent through microwave roasting. Background technique [0002] Nickel is mainly smelted from nickel sulfide ore and laterite nickel 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 is rich in resources, and the amount of nickel stored in laterite nickel ore accounts for 65% of the world's total nickel reserves, while the annual nickel extracted from nickel oxide ore only accounts for 50% of the world's nickel production....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/00B03C1/015C22B23/02
Inventor 彭虎胡正夏广斌
Owner 湖南长拓高科冶金有限公司