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Method for preparing high-grade nickel product through microwave treatment of low-grade 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 the problems of high reduction temperature, long reduction time, low nickel grade and recovery rate, etc., and achieve rapid and selective reduction , reducing the reduction temperature and reduction time, and the effect of synchronously increasing the grade and recovery rate

Active Publication Date: 2022-04-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problems of high reduction temperature, long reduction time, low nickel grade and low recovery rate existing in the existing laterite nickel ore direct reduction-magnetic separation process, and provide a simple process, low production cost, Method for preparing high-grade nickel products by microwave selective reduction of low-grade lateritic nickel ore with high recovery rate of valuable metals, high resource utilization rate, and environmental friendliness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Mix laterite nickel ore, additives, fine powder of reducing agent, and water uniformly in proportion to obtain a mixture. The mixture is compacted and dried to obtain raw balls, which are put into a microwave reactor for reduction to obtain a reduced roasted product, and the reduced roasted product is placed in a ball mill. After a period of time of wet milling, the obtained ball abrasive is put into a magnetic separation tube for magnetic separation to obtain ferronickel concentrate and magnetic separation tailings.

[0052] The average particle size of the laterite nickel ore fine powder particles is 36.2 μm.

[0053] The additive is sodium sulfate, and the average particle size of the sodium sulfate is 23.1 μm.

[0054] The added amount of sodium sulfate is 5wt% of laterite nickel ore.

[0055] The amount of anthracite added is 5wt% of the total amount of laterite nickel ore and sodium sulfate.

[0056] The average particle size of the anthracite is 21.1 μm.

[00...

Embodiment 2

[0067] Mix laterite nickel ore, additives and reducing agent fine powder uniformly in proportion to obtain a mixture, press the mixture into a ball, dry to obtain green balls, put them into a microwave reactor for reduction to obtain a reduced roasted product, put the reduced roasted product in a ball mill and After adding water for wet milling for a period of time, the obtained ball abrasive is put into a magnetic separation tube for magnetic separation to obtain ferronickel concentrate and magnetic separation tailings.

[0068] The average particle size of the laterite nickel ore fine powder particles is 36.2 μm. .

[0069] The additive is sodium sulfate, and the average particle size of the sodium sulfate is 23.1 μm.

[0070]The added amount of sodium sulfate is 10wt% of the laterite nickel ore.

[0071] The amount of anthracite added is 10wt% of the total amount of laterite nickel ore and sodium sulfate.

[0072] The average particle diameter of the anthracite is 21.1 μ...

Embodiment 3

[0083] Mix laterite nickel ore, additives and reducing agent fine powder uniformly in proportion to obtain a mixture, press the mixture into a ball, dry to obtain green balls, put them in a microwave reactor for reduction to obtain a reduced roasted product, put the reduced roasted product in a ball mill and add After wet milling in water for a period of time, the obtained ball abrasive is put into a magnetic separation tube for magnetic separation to obtain ferronickel concentrate and magnetic separation tailings.

[0084] The average particle size of the laterite nickel ore fine powder particle size is 36.2 μm.

[0085] The additive is sodium sulfate, and the average particle size of the sodium sulfate is 23.1 μm.

[0086] The added amount of sodium sulfate is 10wt% of the laterite nickel ore.

[0087] The amount of anthracite added is 15wt% of the total amount of laterite nickel ore and sodium sulfate.

[0088] The average particle diameter of the anthracite is 21.1 μm. ...

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Abstract

The invention discloses a method for preparing a high-grade nickel product by microwave treatment of low-grade laterite-nickel ore. The method comprises two processes of microwave selective reduction roasting and magnetic separation. The method comprises the following steps: mixing laterite-nickel ore fine powder, an additive, a reducing agent and a binder to obtain a mixture, briquetting the mixture, drying to obtain green pellets, putting the green pellets into a microwave reactor, and carrying out microwave roasting under a protective atmosphere to obtain a microwave roasting product; the additive is sodium sulfate; the temperature of the microwave roasting is 600 to 900 DEG C, and the time of the microwave roasting is 20 to 60 minutes; and levigating the obtained reduction roasting product in a ball mill, and carrying out magnetic separation in a magnetic separation tube to obtain ferronickel concentrate and magnetic separation tailings. The product has the advantages of high valuable metal grade and recovery rate, low production cost, environmental friendliness, simple process and the like, and provides a new direction for resource utilization of low-grade laterite-nickel ore.

Description

technical field [0001] The invention belongs to the field of recovery of valuable metals, and in particular relates to a method for preparing high-grade nickel products by microwave-treating low-grade laterite nickel ore. Background technique [0002] As an important strategic metal, nickel is widely used in steel, chemical, national defense, aviation and construction industries. As an important austenite forming element, nickel is widely used in stainless steel production to improve the toughness, plasticity and weldability of stainless steel products. The rapid increase in the production and consumption of nickel-based stainless steel has driven the huge demand for nickel metal. In 2020, my country's nickel production will only account for 5% of the world's nickel production, but its consumption will account for 56.5% of the world's total, which greatly limits the healthy and stable development of my country's stainless steel industry. The main raw material for the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00B03C1/015C22B1/02
CPCY02P10/20
Inventor 彭志伟李光辉唐慧敏姜涛饶明军罗骏田冉俞景峰方晓磊易凌云钟强张元波郭宇峰杨永斌李骞
Owner CENT SOUTH UNIV
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