Method for drying and reducing low-grade latertic nickel ores by using bituminous coal

A lateritic nickel ore and low-grade technology, applied in the field of non-ferrous metals, can solve the problems of low thermal efficiency and achieve obvious economic and social benefits

Inactive Publication Date: 2011-01-12
PINGAN XINHAI RESOURCE DEV +1
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Problems solved by technology

The present invention uses cheap and easy-to-obtain bituminous coal as the reducing agent and heat source, and utilizes the second-stage kiln selective reduction technology of one-stage drying heating and one-stage reduction for low-grade laterite nickel ore with appropriate particle size a

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  • Method for drying and reducing low-grade latertic nickel ores by using bituminous coal
  • Method for drying and reducing low-grade latertic nickel ores by using bituminous coal
  • Method for drying and reducing low-grade latertic nickel ores by using bituminous coal

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[0036] The invention adopts cheap and easily available bituminous coal as heat source and reducing agent, and utilizes the two-stage kiln selective reduction technology of one-stage drying heating and one-stage reduction to realize high-efficiency and selective reduction of nickel, cobalt and copper in laterite nickel ore, and realizes industrial application. The ferrous nickel laterite ore mined from the mine is first pre-screened, 3mm~600mm is crushed to less than 15mm by three stages and one closed circuit, and then sent to the rotary kiln for reduction roasting. The particles smaller than 3mm are mixed with the dust collected by the dust collection system for granulation, and then sent to the rotary kiln for reduction roasting. It adopts continuous airtight two-stage kiln with one-stage drying and heating and one-stage reduction. Coal is used as heat source and reducing agent (addition rate is 10%). It is roasted for 40-50min at a roasting temperature of 700~800℃ in reducing...

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Abstract

The invention discloses a method for drying and reducing low-grade latertic nickel ores by using bituminous coal. The method is characterized by comprising the following processes of: 1, after prescreening iron nickel laterite extracted from mines, crushing mineral grains with the size of between 3 and 600mm into the mineral grains with the size of between 3 to 15mm by a three-section one-closed-circuit method; after transporting the mineral grains to a disc feeder by a belt, quantitatively transporting the mineral grains to a rotary kiln by the disk feeder; and finishing natural material mixing and roasting reduction in the process of the rotation of a kiln body; or 2, after prescreening the iron nickel laterite extracted from the mines, mixing the mineral grains with the size of less than 3mm and dust collected by a dust collecting system; granulating; after transporting the mineral grains to the disk feeder by the belt, quantitatively transporting the mineral grains to the rotary kiln by the disk feeder; finishing the natural material mixing and the roasting reduction in the process of the rotation of the kiln body; and discharging hot materials subjected to roasting reduction, wherein the iron reduction rate reaches 75+/-5 percent and the nickel reduction rate reaches 82+/-3 percent.

Description

technical field [0001] The invention relates to a method for drying and reducing low-grade lateritic nickel ore with bituminous coal, which belongs to the field of nonferrous metals. Background technique [0002] At present, the world's industrial production of nickel mainly utilizes nickel sulfide ore resources, accounting for about 60-65% of the total output, and the rest comes from nickel oxide ore. However, with the depletion of nickel sulfide ore, the proportion of nickel produced from nickel oxide ore is increasing rapidly. Although the research and development of comprehensive utilization of laterite nickel ore has been intensified at home and abroad, and gratifying achievements have been made in the laboratory and industrialization. For example, the Moa Bay laterite nickel ore in Cuba is a good example of nickel extraction by high pressure acid leaching; "Reduction-grinding treatment method of different types of laterite nickel ore" (application number: 200610163831...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B1/02C22B23/00C22B5/10
Inventor 王涛王成彦金涛阮书峰尹飞左武军揭晓武卫宏军
Owner PINGAN XINHAI RESOURCE DEV
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