A method for producing high-nickel molten iron by chain grate machine preheating-electric furnace melting for low-grade laterite nickel ore

A technology of lateritic nickel ore and chain grate machine, which is applied in the field of metallurgy, can solve problems such as unproposed solutions, achieve the effects of large shrinkage and strength changes, low production efficiency, and prevent dust generation

Active Publication Date: 2020-12-18
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For the problems in related technologies, no effective solutions have been proposed yet

Method used

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  • A method for producing high-nickel molten iron by chain grate machine preheating-electric furnace melting for low-grade laterite nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Dry the low-grade lateritic nickel ore to 13.5% water content, crush it, add a certain amount of limestone and dolomite, and adjust the MgO / SiO 2 The ratio is 0.45, and the alkalinity is 0.2; then the laterite nickel ore, limestone and dolomite are mixed in an intensive mixer, and the stirring speed is 1200rpm during the intensive mixing process, and the stirring time is 75 seconds; The pelletizing water is 16.5%, the pelletizing time is 12min, the average particle size is 15mm, the falling strength of the obtained green pellets is 4.3 times / 0.5m, and the compressive strength of the pellets is 11.3N / piece. The ball burst temperature was 320°C. The green balls were dried at 300°C for 7 minutes and preheated at 850°C for 10 minutes on a grate machine (the height of the green ball layer was 90mm), and the compressive strength of the obtained preheated pellets was 610N / piece. After preheating, the red-hot pellets with a temperature of about 850°C are directly put into the ...

Embodiment 2

[0061] Dry the low-grade lateritic nickel ore to 14.7% water content, crush it, add a certain amount of limestone and dolomite, and adjust the MgO / SiO 2 The ratio is 0.55, and the alkalinity is 0.3; then the laterite nickel ore, limestone and dolomite are mixed in an intensive mixer, and the stirring speed is 1700rpm during the intensive mixing process, and the stirring time is 90 seconds; The pelletizing water is 16.0%, the pelletizing time is 15min, and the average particle size is 15mm. The drop strength of the green pellets obtained is 4.8 times / 0.5m, and the compressive strength of the pellets is 13.2N / piece. The ball burst temperature was 355°C. The green balls were dried at 350°C for 5 minutes and preheated at 900°C for 12 minutes on a grate machine (the height of the green ball layer was 100mm), and the compressive strength of the obtained preheated pellets was 724N / piece. After preheating, the red-hot pellets with a temperature of about 900°C are directly put into th...

Embodiment 3

[0067] Dry the low-grade lateritic nickel ore to a water content of 14.6%, crush it, add a certain amount of limestone and dolomite, and adjust the MgO / SiO 2 The ratio is 0.65, and the alkalinity is 0.4; then the laterite nickel ore, limestone and dolomite are mixed in an intensive mixer, and the stirring speed is 1800rpm during the intensive mixing process, and the stirring time is 90 seconds; The pelletizing water is 16.5%, the pelletizing time is 15min, and the average particle size is 15mm. The drop strength of the green pellets obtained is 4.9 times / 0.5m, and the compressive strength of the pellets is 13.8N / piece. The ball burst temperature was 375°C. The green balls were dried at 350°C for 6 minutes and preheated at 950°C for 15 minutes on a grate machine (the height of the green ball layer was 105mm). The compressive strength of the obtained preheated pellets was 788N / piece. After preheating, the red-hot pellets with a temperature of about 950°C are directly put into t...

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Abstract

The invention discloses a method for preparing high-nickel molten iron from low-grade laterite-nickel ore by using chain grate machine preheating and electric furnace smelting separation. The method comprises the following steps that S1, drying pretreatment and crushing are carried out on the laterite-nickel ore to obtain laterite-nickel ore powder; S2, the laterite-nickel ore powder is uniformlymixed with a fusing agent to obtain a uniform mixture, and pelletizing is carried out to obtain green balls; S3, the green balls are fed into a chain grate machine for drying, preheating and roastingto obtain preheated pellets; and S4, the preheated pellets are mixed with a reducing agent, and then are fed into an electric furnace for smelting separation to obtain high-nickel molten iron and furnace slag. According to the production method, the electric furnace burden which is high in strength, uniform in particle size and excellent in quality is prepared, and the high-temperature hot preheated pellets are directly fed into the electric furnace to be subjected to reduction and smelting separation, so that the heat required for re-heating to reach the smelting separation temperature is saved, then the electricity consumption of the electric furnace is reduced, and meanwhile, the metal recovery rate is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing high-nickel molten iron by preheating a chain grate machine for low-grade laterite nickel ore and melting in an electric furnace. Background technique [0002] 80% of nickel is mainly used in the stainless steel industry. The stainless steel industry is the main driving force for the growth of the nickel market. The global stainless steel production scale is growing rapidly. In 2018, the world's stainless steel production reached 50.72 million tons, a year-on-year increase of 5.5%. The demand for nickel raw materials has also increased significantly. According to statistics, the global apparent consumption of nickel in 2018 was 2.245 million tons. [0003] More than 50% of the world's nickel production comes from nickel sulfide ore. However, with the depletion of high-grade and easy-to-mining nickel sulfide ores and the rapid development of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/02C21B11/10C22B23/02
CPCC21B11/10C22B1/02C22B1/2406C22B23/023
Inventor 郭正启潘建朱德庆李启厚
Owner CENT SOUTH UNIV
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