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Method for comprehensively recovering waste lump ore in laterite-nickel ore

A technology of laterite nickel ore and laterite nickel, which is applied in the field of iron and steel metallurgy, can solve the problems of inability to absorb waste lump ore, etc., and achieve the effects of improving quality indicators, simple treatment process, and reducing the cost of auxiliary materials.

Pending Publication Date: 2021-06-15
GUANGDONG GUANGQING METAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the recorded sinter layer height of 680mm ~ 800mm, lump ore as the base layer thickness of 10mm ~ 30mm, the amount of lump ore added is only 1.2% ~ 4.4%, obviously unable to absorb all the waste lump ore in raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] For the prepared mixture, the amount of waste lump ore after crushing accounts for 10% of the total mass ratio of the mixture, and the SiO in the mixed granulation 2 The content is adjusted to 4.3%, the mass ratio of magnesium to silicon is adjusted to 0.65, the mass ratio of magnesium to aluminum is adjusted to 0.48, and quicklime is further added to adjust the mixed granulation binary alkalinity to 1.3, and the quaternary alkalinity to 0.80; After uniform granulation and sintering, the finished sintered ore is obtained, and the yield rate of the obtained finished sintered ore is 70.6%. The sintered ore is put into the blast furnace for reduction and melting, and the comprehensive recovery rate of nickel in the laterite nickel ore (including the abandoned lump ore) is 68.7%.

Embodiment 2

[0048] In the prepared mixture, the amount of waste lump ore after crushing accounts for 15% of the total mass ratio of the mixture, and the SiO in the mixed granulation 2 The content is adjusted to 5.5%, the mass ratio of magnesium to silicon is adjusted to 0.70, the mass ratio of magnesium to aluminum is adjusted to 0.64, and quicklime is further added to adjust the mixed granulation binary alkalinity to 1.3, and the quaternary alkalinity to 0.95; After uniform granulation and sintering, the sintered ore is obtained, and the yield rate of the obtained sintered ore is 74.2%. The sintered ore is put into the blast furnace for reduction and melting, and the comprehensive recovery rate of nickel in the laterite nickel ore (including the abandoned lump ore) is 72.5%.

Embodiment 3

[0050] In the prepared mixture, the amount of waste lump ore after crushing accounts for 18% of the total mass ratio of the mixture, and the SiO in the mixed granulation 2 The content is adjusted to 5.5%, the mass ratio of magnesium to silicon is adjusted to 0.70, the mass ratio of magnesium to aluminum is adjusted to 0.64, and quicklime is further added to adjust the mixed granulation binary alkalinity to 1.3, and the quaternary alkalinity to 0.95; After uniform granulation and sintering, the sintered ore is obtained, and the yield of the obtained sintered ore is 74.2%. The sintered ore is put into the electric furnace for reduction and melting, and the comprehensive recovery rate of nickel in the laterite nickel ore (including the abandoned lump ore) is 73.1%.

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Abstract

The invention discloses a method for comprehensively recovering waste lump ore in laterite-nickel ore, and relates to comprehensive utilization of metallurgical secondary resources. The method comprises the following steps that multi-stage crushing and screening are conducted on the waste lump ore obtained by conducting slide screening in advance until the granularity of 90% of the waste lump ore is less than 3mm, the waste lump ore is added into the laterite-nickel ore under the slide screening again in proportion, flux, fuel and return ore are added for mixing and granulating, and sintering is conducted to obtain sintered finished ore; and the sintered finished ore enters a blast furnace or an electric furnace to smelt nickel-containing molten iron. According to the method, the waste lump ore brought in the raw laterite-nickel ore can be completely absorbed, and high-content silicon and magnesium components of the waste lump ore are fully utilized, so that the chemical components of the sintering mixture are regulated and controlled, the sintering mineralization behavior is strengthened, and the yield of the sintered ore is increased; and after high-temperature melting separation, valuable metal in the waste lump ore is efficiently recovered, and particularly, the recovery rates of nickel and iron are high. The method is easy to operate, the waste lump ore in the laterite-nickel ore is fully recycled, and the raw material purchasing cost and the ferronickel and stainless steel production cost of related enterprises are remarkably reduced.

Description

technical field [0001] The invention discloses a method for comprehensively recovering waste lump ore in laterite nickel ore, belongs to the technical field of iron and steel metallurgy, and particularly relates to the comprehensive utilization of metallurgical secondary resources. [0002] technical background [0003] Stainless steel is an important high-end material in national economic construction. According to statistics, my country's crude stainless steel production reached 29.4 million tons in 2019, accounting for 56% of the world's total crude stainless steel production. Among them, the output of 200 series stainless steel and 300 series stainless steel was 10.22 million tons and 13.40 million tons respectively, accounting for 34.8% and 45.9% of the total domestic stainless steel output. As nickel-based stainless steel, the two together account for 80.7% of my country's total stainless steel output. [0004] Laterite nickel ore is the main mineral raw material for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248C22B23/00C22B7/00C21B5/00C21B11/10C22B1/16
CPCC22B1/248C22B1/16C22B23/005C21B5/00C21B11/10C22B7/004Y02P10/20
Inventor 董兴红胡前盛刘光勇郑佳奎姚尧
Owner GUANGDONG GUANGQING METAL TECH
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