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Method of Multi-factor Coupling and Synergistic Strengthening of Laterite Nickel Ore Sintering

A lateritic nickel ore and multi-factor technology, applied in the field of iron and steel metallurgy, can solve problems such as high physical water and crystal water content, low sinter output and strength, and poor sinter mineralization conditions, so as to reduce over-humidity and improve Ore-forming conditions and microstructure, the effect of reducing sintering speed and material surface cooling speed

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

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Problems solved by technology

However, due to the complex structure of low-grade lateritic nickel ore, large changes in chemical composition, high content of physical water and crystal water, large burning loss, and more impurities such as nickel stones, the sinter mineralization conditions are poor and the sinter structure is loose. Porous, low sinter output and strength, high solid fuel consumption

Method used

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  • Method of Multi-factor Coupling and Synergistic Strengthening of Laterite Nickel Ore Sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for multi-factor coupling to synergistically strengthen the sintering of laterite nickel ore, see figure 1 , Including the following steps:

[0037] (1) Ingredients: 54wt% of low-grade laterite nickel ore with 1.2% nickel content, 30wt% of returned ore powder, 6.00wt% of anthracite, and 10wt% of quicklime are mixed to obtain a mixture.

[0038] (2) Mixing and granulation: add water to the mixture, mix in the cylinder mixer, and control the mixer speed to 25r·min -1 , The filling rate is 15%, the granulation time is 5min, the moisture content is 17.0wt%, the particle size is 96wt% greater than 0.5mm, 88wt% greater than 1mm sintered material.

[0039] (3) Ignition: Use low-grade waste lump ore with a particle size of 10-16mm with 1.0% nickel and 18% iron grade as sintering paving material and distributing it on the grate bar of the sintering machine trolley. The filling height of the sintering paving material layer is 30mm. Then the sintered material of step (2) is loa...

Embodiment 2

[0045] A method for multi-factor coupling and synergistic strengthening of laterite nickel ore sintering includes the following steps:

[0046] (1) Ingredients: mix 54wt% of low-grade laterite nickel ore with 1.2% nickel content, 30wt% of returned ore powder, 6.75wt% of anthracite, and 9.25wt% of quicklime to obtain a mixture.

[0047] (2) Mixing and granulation: add water to the mixture, mix in the cylinder mixer, and control the mixer speed to 25r·min -1 , The filling rate is 15%, the granulation time is 5min, the moisture content is 17.0%, the particle size is 96 wt% greater than 0.5mm, and 85.8 wt% greater than 1mm.

[0048] (3) Ignition: Use low-grade waste lump ore with a particle size of 10-16mm with 1.0% nickel and 18% iron grade as sintering paving material and distributing it on the grate bar of the sintering machine trolley. The filling height of the sintering paving material layer is 30mm. Then the sintered material of step (2) is loaded into the sintering machine and lai...

Embodiment 3

[0054] A method for multi-factor coupling to synergistically strengthen the sintering of laterite nickel ore, see figure 1 , Including the following steps:

[0055] (1) Ingredients: mix 54wt% of low-grade laterite nickel ore with 1.2% nickel content, 30wt% of returned ore powder, 6.90wt% of anthracite, and 9.1wt% of quicklime to obtain a mixture.

[0056] (2) Mixing and granulation: add water to the mixture, mix in the cylinder mixer, and control the mixer speed to 25r·min -1 , The filling rate is 15%, the granulation time is 5min, the moisture content is 17.0%, the particle size is 96 wt% greater than 0.5mm, and 85 wt% greater than 1mm.

[0057] (3) Ignition: Use low-grade waste lump ore with a particle size of 10-16mm with 1.0% nickel and 18% iron grade as sintering paving material and distributing it on the grate bar of the sintering machine trolley. The filling height of the sintering paving material layer is 30mm. Then put the sintered material of step (2) into the sintering ma...

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Abstract

The invention discloses a method for multi-factor coupling synergistic-intensifying laterite nickel ore sintering. The method comprises the following steps of mixing a laterite nickel ore, ore returning powder, a fuel and quick lime to obtain a mixture; adjusting the moisture of the mixture to be 16 percent by weight to 18 percent by weight, and mixing and granulating to obtain a sintered material; igniting and sintering the sintered material to obtain a hot sintered ore; and after cooling the hot sintered ore, smashing and screening to obtain a finished sintered ore product. According to themethod provided by the invention, multi-factor coupling synergistic-intensifying laterite nickel ore sintering is realized, the yield and the strength of the sintered ore are improved, and the solid fuel consumption is reduced.

Description

Technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for multi-factor coupling and synergistic strengthening of laterite nickel ore sintering. Background technique [0002] Nickel resources in the world are divided into nickel sulfide ore and nickel oxide ore. Nickel oxide ore is laterite nickel ore. At present, about 40% of the world's nickel products are produced from laterite nickel ore, and the rest are from nickel sulfide ore. However, with the over-development of high-grade, easy-to-mine nickel sulfide ore, and the influence of factors such as the maturity of laterite nickel smelting technology , The use of laterite nickel ore to produce nickel products is gradually becoming the mainstream of the world. [0003] The laterite nickel mines in the world are mainly distributed in tropical countries within 30° north and south of the equator. The proven nickel deposits on land are about 80 million tons, mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B1/16
CPCC22B1/16C22B23/005
Inventor 朱德庆潘建李启厚郭正启杨聪聪李紫云梁钟仁
Owner CENT SOUTH UNIV