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A reduction reaction system and method for efficiently treating hydrous pellets of laterite nickel ore

A technology of lateritic nickel ore and water polo, applied in the field of chemical metallurgy, can solve the problems of long pretreatment process, unsmooth production, large equipment investment, etc., and achieve the effect of low cost, reduced equipment investment, and high equipment operation rate

Active Publication Date: 2018-07-13
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the feed to the rotary hearth furnace is mostly dried carbon-containing pellets instead of powder or wet pellets (such as patent CN 102912209 B). This is because: (1) powder feeding into the furnace can easily cause burner blockage; ( 2) If the wet pellets are directly put into the furnace, they will disintegrate under high temperature conditions and generate dust in the furnace. Under the disturbance of the gas in the furnace, it will cause the burner to be blocked, so that the production cannot go smoothly.
It can be seen that a series of pretreatment "mixing-pellet-drying" before the reduction of the rotary hearth furnace is a necessary pretreatment step for the existing rotary hearth furnace equipment, but this leads to the defects of long pretreatment process and large equipment investment , to be further improved

Method used

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  • A reduction reaction system and method for efficiently treating hydrous pellets of laterite nickel ore
  • A reduction reaction system and method for efficiently treating hydrous pellets of laterite nickel ore
  • A reduction reaction system and method for efficiently treating hydrous pellets of laterite nickel ore

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Experimental program
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Effect test

Embodiment 1

[0060] Use TFe18.5% laterite nickel ore containing 1.5% Ni as the raw material, first crush the laterite nickel ore to less than 3mm, according to the amount of reducing agent added is 1.0 times of the theoretical addition amount, and the amount of limestone added is 10% of the weight of laterite nickel ore %, the addition of industrial alkali is 4% of the laterite nickel ore weight, and the monazite addition is 2% of the laterite nickel ore weight. Mixing-balling, the obtained water-containing pellets have a moisture content of 15%, and the water-containing pellets Directly put into the rotary hearth furnace device for drying and reduction treatment. The drying preheating zone of the rotary hearth furnace device is heated by a drying tube, and the reduction zone is heated by a regenerative burner; the angle of the ring in the drying preheating zone is 20° , the included angle of the ring in the reduction zone is 270°; the minimum temperature in the drying preheating zone is 90...

Embodiment 2

[0062] Use TFe22.3% and laterite nickel ore containing Ni 1.78% as raw material, first crush the laterite nickel ore to less than 1mm, add 1.4 times the theoretical amount of reducing agent, and add limestone to 25% of the weight of the laterite nickel ore. %, borax addition is 5% of laterite nickel ore weight, sodium chloride addition is the proportioning of 3% of laterite nickel ore weight and carries out mixing-ball making, and the water-containing pellet water content that obtains is 17%, and the water-containing pellet It is directly placed into the rotary hearth furnace device for drying and reduction treatment. The drying preheating zone of the rotary hearth furnace device is heated by a drying tube, and the reduction zone is heated by a common burner; the included angle of the ring in the drying preheating zone is 120°, and the reduction The included angle of the ring in the zone is 200°; the minimum temperature in the drying preheating zone is 800°C, and the maximum te...

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Abstract

The invention relates to the field of chemical metallurgy, in particular to a reducing reaction system and method for efficiently treating hydrous pellets of lateritic nickel ore. For the defects existing in the prior art, the reducing reaction system and method for efficiently treating the hydrous pellets in the lateritic nickel ore are provided. According to the system and method, by improving the heating manner of a rotary hearth furnace, a pellet drying process before the rotary hearth furnace is omitted on the premise of not influencing the product indexes, the technological process is shortened, and the equipment investment is lowered; the reducing reaction system and method have the beneficial effects that the treatment process is short, the equipment investment is low, the equipment operation rate is high, and the energy consumption is low; besides, reducing products are subjected to two-time recovery treatment, and the recovery rate of the lateritic nickel ore is increased; and accordingly efficient recovery of the lateritic nickel ore of the system is achieved.

Description

technical field [0001] The invention relates to the field of chemical metallurgy. Specifically, the present invention relates to a system and method for utilizing the reduction reaction of laterite nickel ore. Background technique [0002] Nickel has the advantages of anti-oxidation, anti-corrosion, high temperature resistance, high strength, etc. It has a wide range of uses in modern industry, and is mainly used in the production of stainless steel. The world's nickel resources are mainly divided into nickel sulfide ore and laterite nickel ore. At present, with the depletion of available nickel sulfide ore, the development of laterite nickel ore has been paid more and more attention. [0003] In the current industrial production, the most widely used pyrometallurgy of laterite nickel ore is the RKEF method. This method uses rotary kiln equipment to pre-reduce laterite nickel ore, and the obtained calcined sand is sent to an ore-thermal electric furnace for smelting, and fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/02C22B1/24
CPCC22B1/2406C22B23/005C22B23/021C22B23/023
Inventor 王静静宋文臣李红科曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST