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A kind of sintering method of laterite nickel ore

A sintering method and a technology for laterite nickel ore, which are applied in the field of iron and steel metallurgy, can solve unseen problems, and achieve the effects of reducing CO2 emissions, improving strength, and reducing the cooling rate of material surface.

Active Publication Date: 2019-12-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no patent or report on the sintering of laterite nickel ore with high sintering loss using the hot air cooled by sinter to intensify sintering, and there is no precedent for using hot air with a cooling temperature lower than 300°C for laterite nickel ore sintering

Method used

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  • A kind of sintering method of laterite nickel ore
  • A kind of sintering method of laterite nickel ore
  • A kind of sintering method of laterite nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of method for hot air sintering of laterite nickel ore, see figure 1 , including the following steps:

[0036] (1) Ingredients: Mix 53wt% of low-grade lateritic nickel ore with a nickel content of 1.2%, 30wt% of returned ore powder, 7.3wt% of anthracite, and 9.7wt% of quicklime to obtain a mixture.

[0037] (2) Mixing and granulation: Add water to the mixture, and adjust the water level of the mixture to 17.0%. Mix in a cylinder mixer, control the speed of the mixer to 25 r min -1 , the filling rate was 15%, and the granulation time was 5 minutes. The sintered material with a moisture content of 17.0% was obtained. In the sintered material, the particles with a particle size greater than 0.5mm accounted for 96%, and the particles with a particle size greater than 1mm accounted for 87%.

[0038] (3) Ignition and sintering: put the sintered material in step (2) into the sintering machine, and the filling height of the sintered material layer is 680mm. Control the ...

Embodiment 2

[0044] A method for hot air circulation sintering of laterite nickel ore, comprising the following steps:

[0045] (1) Ingredients: Mix 53wt% of low-grade lateritic nickel ore with a nickel content of 1.2%, 30wt% of returned ore powder, 7.3wt% of anthracite, and 9.7wt% of quicklime to obtain a mixture.

[0046] (2) Mixing and granulation: Add water to the mixture, and adjust the water level of the mixture to 17.0%. Mix in a cylinder mixer, control the speed of the mixer to 25r min -1 , the filling rate was 15%, and the granulation time was 5 minutes. The sintered material with a moisture content of 17.0% was obtained. In the sintered material, the particles with a particle size greater than 0.5mm accounted for 96%, and the particles with a particle size greater than 1mm accounted for 87%.

[0047] (3) Ignition and sintering: put the sintered material in step (2) into the sintering machine, and the filling height of the sintered material layer is 680 mm. Control the ignition ...

Embodiment 3

[0053] A method for hot air circulation sintering of laterite nickel ore, comprising the following steps:

[0054] (1) Ingredients: Mix 53wt% of low-grade lateritic nickel ore with a nickel content of 1.2%, 30wt% of returned ore powder, 7.3wt% of anthracite, and 9.7wt% of quicklime to obtain a mixture.

[0055] (2) Mixing and granulation: Add water to the mixture, and adjust the water level of the mixture to 17.0%. Mix in a cylinder mixer, control the speed of the mixer to 25r min -1 , the filling rate was 15%, and the granulation time was 5 minutes. The sintered material with a moisture content of 17.0% was obtained. In the sintered material, the particles with a particle size greater than 0.5mm accounted for 96%, and the particles with a particle size greater than 1mm accounted for 87%.

[0056] (3) Ignition and sintering: put the sintered material in step (2) into the sintering machine, and the filling height of the sintered material layer is 680 mm. Control the ignition ...

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Abstract

The invention discloses a laterite-nickel ore sintering method based on medium and low temperature cooling hot-blast air. The sintering method comprises the following steps: mixing laterite-nickel ore, ore returning powder, fuel and quicklime to obtain a mixture; adjusting the moisture of the mixture to be 16wt%-18wt%, and pelletizing the mixture in a mixed manner to obtain sintered material; igniting and sintering the sintered material to obtain hot sinter; during the sintering process, feeding hot-blast air lower than 300 DEG C into a sintering machine burden surface fume hood; carrying outheat exchange on cold-blast air and hot sinter to obtain hot-blast air and cold sinter; and crushing and screening the cold sinter to obtain sinter of finished product. According to the method, the medium and low temperature hot-blast air below 300 DEG C is returned to the sintering machine, so that the minerogenetic condition of the sinter is improved and the laterite-nickel ore sintering strength is improved; and in addition, the effective utilization of cooled hot exhaust gas of the sinter is realized, solid burnup is reduced, and emission of CO2 is reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a sintering method of laterite nickel ore based on medium and low temperature cooling hot air. Background technique [0002] Nickel resources in the world are divided into two types: nickel sulfide ore and nickel oxide ore. Nickel oxide ore is laterite nickel ore. At present, about 40% of the world's nickel products come from laterite nickel ore, and the rest come from nickel sulfide ore. , the use of laterite nickel ore to produce nickel products is gradually becoming the mainstream in the world. [0003] The laterite nickel ore in the world is mainly distributed in tropical countries within 30° north and south of the equator line. The proven reserves of nickel ore resources on land are about 80 million tons, mainly in Cuba (23 million tons), Indonesia (13 million tons), The Philippines (11 million tons), Australia (11 million tons), New Caledonia (14 million...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/2406
Inventor 潘建朱德庆李启厚郭正启梁钟仁李紫云李思唯杨聪聪薛钰霄师本敬田宏宇
Owner CENT SOUTH UNIV
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