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Pressurized densification sintering method for laterite nickel ore

A laterite nickel ore and densification technology, applied in the field of iron and steel metallurgy, can solve the problems of no patents and reports on enhanced sintering, unfavorable blast furnace production, and low liquid phase generation, and achieves improvement of sinter output, reduction of pore size and Quantity, the effect of increasing yield and strength

Active Publication Date: 2018-06-29
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high content of physical water and crystal water in low-grade lateritic nickel ore, large burning loss, and little liquid phase formation during sintering, the sintered ore is loose and porous, and its strength is low, which is unfavorable for subsequent blast furnace production.
[0005] At this stage, no patents or reports related to the enhanced sintering of laterite nickel ore with an external pressure field have been found

Method used

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  • Pressurized densification sintering method for laterite nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of method of pressure densification sintering of laterite nickel ore, see figure 1 , including the following steps:

[0033] (1) Ingredients: Mix 53wt% lateritic nickel ore with a nickel content of 1.4%, 30wt% return ore powder, 7.5wt% anthracite, and 9.5wt% quicklime to obtain a mixture.

[0034] (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 to obtain a sintered material with a moisture content of 17.0%. In the sintered material, the sintered material with a particle size greater than 0.5 mm was 96 wt%, and the sintered material with a particle size greater than 1 mm was 86 wt%.

[0035] (3) Ignition: put the sintered material in step (2) into the sintering machine, and the filling height of the sintered material layer is 680mm. Control the ignition negative press...

Embodiment 2

[0041] A method for pressurized and densified sintering of laterite nickel ore, comprising the following steps:

[0042] (1) Ingredients: Mix 53wt% lateritic nickel ore with a nickel content of 1.4%, 30wt% return ore powder, 7.5wt% anthracite, and 9.5wt% quicklime to obtain a mixture.

[0043] (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 to obtain a sintered material with a moisture content of 17.0%. In the sintered material, the sintered material with a particle size greater than 0.5 mm was 96 wt%, and the sintered material with a particle size greater than 1 mm was 86 wt%.

[0044] (3) Ignition: put the sintered material in step (2) into the sintering machine, and the filling height of the sintered material layer is 680mm. Control the ignition negative pressure to 5kPa, the ig...

Embodiment 3

[0050] A method for pressurized and densified sintering of laterite nickel ore, comprising the following steps:

[0051] (1) Ingredients: Mix 57wt% lateritic nickel ore with a nickel content of 1.4%, 30wt% return ore powder, 6.5wt% anthracite, and 6.5wt% quicklime to obtain a mixture.

[0052] (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 to obtain a sintered material with a moisture content of 17.0%. In the sintered material, the sintered material with a particle size greater than 0.5 mm was 96 wt%, and the sintered material with a particle size greater than 1 mm was 86 wt%.

[0053] (3) Ignition: put the sintered material in step (2) into the sintering machine, and the filling height of the sintered material layer is 680mm. Control the ignition negative pressure to 5kPa, the ig...

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Abstract

The invention discloses a pressurized densification sintering method for laterite nickel ore, which includes steps of: 1) mixing laterite nickel ore, return mine powder, a fuel, and quicklime to obtain a mixture material; 2) regulating water content of the mixture material to 16-18 wt%, and performing mixing granulation to obtain a sintering material; 3) loading the sintering material in a sintering machine and igniting the sintering machine; 4) applying an external force field to the surface of the sintering material and sintering the sintering material to obtain thermo-sintered ore; 5) removing the external force field and cooling the thermo-sintered ore, and crushing and sieving the product to obtain a sintered ore finish product. In the method, by applying a certain pressure to the surface of the laterite nickel ore sintering material, loosen sintered ore from the surface layer to the middle layer can be auto-densified, so that strength and yield of the sintered laterite nickel orecan be improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for pressurized and densified sintering of laterite nickel ore. 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 tons), etc., of which...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B1/24C22B23/02
Inventor 朱德庆潘建潘料庭李启厚黄庆周郭正启黄学忠杨聪聪杨静李紫云梁钟仁李君荣
Owner CENT SOUTH UNIV
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