A kind of reduction reaction system and method of laterite nickel ore water-containing pellets

A technology of laterite nickel ore and water-containing pellets, which is applied in the field of chemical metallurgy, can solve problems such as weak power infrastructure, influence on normal production, and low equipment operation rate, reduce production costs and equipment investment, shorten pretreatment processes, and solve The effect that the burner is easy to clog

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

This method has the following disadvantages: (1) The smelting process uses electric energy for smelting, which is highly dependent on electricity
On the one hand, my country's power supply continues to be tight, and the control of high-power-consuming industries is very strict, and once the power consumption is tight in the area where the production enterprise is located, the first thing to do is to cut off the power of the large power-consuming electric furnace, making the production abnormal
On the other hand, for underdeveloped countries or regions (such as Indonesia) where the laterite nickel resources are widely distributed but the power infrastructure is relatively weak, the RKEF method is restricted and limited by power resources
(2) High energy consumption and heavy pollution
Therefore, the conversion efficiency of coal power generation is only about 1 / 3, and the loss of energy consumption is very large
(3) Rotary kiln equipment is easy to form rings, and the furnace is frequently shut down to make rings, and the equipment operation rate is low, which affects normal production
At present, most of the existing rotary hearth furnaces are fed with dried carbon-containing pellets instead of powder or wet pellets. This is because: (1) powder feed into the furnace can easily cause burner blockage; (2) if wet pellets Directly entering the furnace will cause fragmentation under high temperature conditions (the temperature of entering the furnace is above 1000°C), and dust will be generated in the front area of ​​the cloth distribution area and the combustion area. The burner in the front section is blocked, so that the generation cannot go forward
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 kind of reduction reaction system and method of laterite nickel ore water-containing pellets
  • A kind of reduction reaction system and method of laterite nickel ore water-containing pellets
  • A kind of reduction reaction system and method of laterite nickel ore water-containing pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Choose laterite nickel ore with TFe21.8% and Ni 1.58% as raw material, first crush the laterite nickel ore to less than 3mm, and mix according to the ratio of reducing agent addition to 1.0 times of the theoretical addition amount without adding flux- Pressed balls, the moisture content of the pressed water-containing pellets is 14%, and the pressed water-containing pellets are directly distributed into the sectional rotary hearth furnace device for drying and reduction treatment. The drying area of ​​the sectional rotary hearth furnace device is heated by a drying tube and dried The heat source of the tube comes from the natural gas supply device, and the reduction zone is heated by a regenerative burner; the included angle of the circle in the drying zone is 30°, and the angle between the circles in the reduction zone is 270°; the minimum temperature in the drying zone is 900°C, the reduction The highest temperature in the zone is 1350°C; the segmented rotary hearth fu...

Embodiment 2

[0053]Select laterite nickel ore with TFe17.1% and Ni 1.80% as raw material, first crush the laterite nickel ore to less than 1mm, add 1.5 times the theoretical amount of reducing agent, and add limestone to the weight of the laterite nickel ore 10% for mixing and pelletizing, the moisture content of the water-containing pellets is 18%, and the pressed water-containing pellets are directly distributed into the sectional rotary hearth furnace device for drying-reduction treatment, and the drying area of ​​the sectional rotary hearth furnace device is heated by a drying tube , the heating method of the drying tube is electric heating, and the reduction area is heated by a burner; the included angle of the ring in the drying area is 90°, and the included angle of the ring in the reduction area is 210°; the minimum temperature in the drying area is 700°C, and the reduction The maximum temperature in the zone is 1300°C; the sectional rotary hearth furnace device rotates for 60 minut...

Embodiment 3

[0055] Select laterite nickel ore with TFe41.0% and Ni 1.30% as raw material, first crush the laterite nickel ore to less than 2mm, add reducing agent to 0.8 times the theoretical addition amount, and add quicklime to the weight of the laterite nickel ore 5% for mixing-pelleting, the moisture content of the water-containing pellets is 19%, and the pressed water-containing pellets are directly distributed into the sectional rotary hearth furnace device for drying-reduction treatment, and the drying area of ​​the sectional rotary hearth furnace device is used for drying. Heating, the heat source of the drying tube comes from a gas generator, and the reduction zone is heated by a burner; the included angle of the ring in the drying zone is 140°, and the included angle of the ring in the reduction zone is 160°; the minimum temperature in the drying zone is 900°C, and the reduction The highest temperature in the zone is 1250°C; the segmented rotary hearth furnace rotates for 90 minu...

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Abstract

The invention relates to the field of chemical engineering metallurgy, in particular to a system and a method using a nickel laterite ore reduction reaction. Aiming at the defects in the prior art, the invention proposes a reduction reaction system and a method of a nickel laterite ore water-contained pellet. The system and the method improve a heating mode of a segmented rotary hearth furnace device to remove a pellet drying process before the segmented rotary hearth furnace device under the precondition of not influencing product indexes so as to shorten the process flow and to reduce the equipment investment, and have such advantages as short treatment flow, low equipment investment, high equipment operation rate, low energy consumption and wide application range.

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. 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 finally nic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/00C22B5/10C22B23/02
CPCC22B1/00C22B1/2406C22B5/10C22B23/005C22B23/023
Inventor 王静静宋文臣李红科曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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