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A composite additive for strengthening the sintering of laterite nickel ore and its application method

A composite additive, a technology of laterite nickel ore, which is applied in the fields of metallurgy and material science, can solve the problems that restrict the development of laterite nickel ore sintering-blast furnace method, high energy consumption of sintered solids, and high crystallization water content, and can improve liquid phase fluidity, The effect of promoting microstructure formation and high FeO content

Active Publication Date: 2021-04-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high crystal water content of limonite-type lateritic nickel ore, large burning loss, high silicon and magnesium content, and difficulty in producing a liquid phase in the sintering process, the sintered solid has high energy consumption, poor strength, and low utilization coefficient, which seriously restricts laterite. Nickel Ore Sintering-Development of Blast Furnace Process

Method used

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  • A composite additive for strengthening the sintering of laterite nickel ore and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Batching: will contain the TFe of 48.48wt%, the Ni of 0.92wt%, the MgO of 1.36wt%, the SiO of 4.55wt% 2 The lateritic nickel ore with LOI value of 13.4wt%, with 5% composite additive (nickel smelting waste residue: 55%, magnetic separation tailings: 15%, waste activated carbon: 30%), 30wt% return ore, 5.5wt% pulverized coal , 6.5wt% unslaked lime; add water to the mixture, adjust the water content of the mixture to 17.0%; mix in a cylinder mixer, control the speed of the mixer to 30r min -1 , the filling rate was 25%, the digestion time was 3 minutes, and the granulation time was 4 minutes to obtain the sintered raw meal after granulation.

[0045] (2) Sintering: put the pellets into the sintering cup, add sintered ore with a particle size of 10-16mm to lay the bottom material before cloth, and then put the pellets evenly into the sintering cup, the cloth height is 800mm, Then lightly press it to 780mm with a presser. The sintering ignition adopts natural gas igni...

Embodiment 2

[0049] (1) Batching: will contain the TFe of 48.48wt%, the Ni of 0.92wt%, the MgO of 1.36wt%, the SiO of 4.55wt% 2 The lateritic nickel ore with LOI value of 13.4wt%, with 10% composite additive (nickel smelting waste residue: 65%, magnetic separation tailings: 10%, waste activated carbon: 25%), 30wt% return ore, 4.5wt% pulverized coal , 6.5wt% unslaked lime; add water to the mixture, adjust the water content of the mixture to 16.7%; mix in a cylinder mixer, control the speed of the mixer to 30r min -1 , the filling rate was 25%, the digestion time was 3 minutes, and the granulation time was 5 minutes to obtain the sintered raw meal after granulation.

[0050] (2) Sintering: put the pellets into the sintering cup, add sintered ore with a particle size of 10-16mm to lay the bottom material before cloth, and then put the pellets evenly into the sintering cup, the cloth height is 800mm, Then lightly press it to 780mm with a presser. The sintering ignition adopts natural gas ign...

Embodiment 3

[0054] (1) Batching: will contain the TFe of 48.48wt%, the Ni of 0.92wt%, the MgO of 1.36wt%, the SiO of 4.55wt% 2 The lateritic nickel ore with LOI value of 13.4wt%, with 15% composite additive (nickel smelting waste residue: 60%, magnetic separation tailings: 15%, waste activated carbon: 25%), 30wt% return ore, 3.2wt% pulverized coal , 6.8wt% unslaked lime and mix; add water in the mixture, adjust the water content of the mixture to be 16.7%; mix in the cylinder mixer, control the speed of the mixer to 30r min -1 , the filling rate was 25%, the digestion time was 3 minutes, and the granulation time was 4 minutes to obtain the sintered raw meal after granulation.

[0055] (2) Sintering: put the pellets into the sintering cup, add sintered ore with a particle size of 10-16mm to lay the bottom material before cloth, and then put the pellets evenly into the sintering cup, the cloth height is 950mm, Then lightly press it to 930mm with a presser. The sintering ignition adopts na...

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Abstract

The invention belongs to the field of metallurgy and material science and technology, and in particular relates to a composite additive for strengthening the sintering of laterite nickel ore and its application method. The composition is as follows: nickel smelting waste residue 55-75wt%; laterite nickel ore magnetic separation tailing slag 5-15wt% ; Waste activated carbon 20~30wt%. The nickel smelting waste slag is the smelting slag produced during the nickel sulfide smelting process; the laterite nickel ore magnetic separation tailings are non-magnetic substances produced by laterite nickel ore direct reduction-magnetic separation; the waste activated carbon is sintering flue gas Waste activated carbon produced in the process of desulfurization and denitrification. The invention strengthens the sintering of the laterite nickel ore by adding multifunctional composite additives in the sintering process, improves the strength of the sintered ore, and reduces the energy consumption of the sintered solid.

Description

technical field [0001] The invention relates to the technical fields of metallurgy and material science, in particular to a composite additive for strengthening the sintering of laterite nickel ore and its application method. Background technique [0002] 85% of nickel in my country is used in stainless steel production. With the depletion of nickel sulfide ore, laterite nickel ore, which accounts for more than 60% of the total nickel resources, has become the main source of nickel. Compared with the production of stainless steel using high-purity nickel plate prepared from nickel sulfide ore as the main raw material, ferronickel produced by laterite nickel ore has the advantages of short process, low cost and good product performance. At the same time, pyro-smelting of laterite nickel ore to produce ferronickel can not only avoid the waste of energy and resources caused by the separation of nickel and iron followed by alloying, but also reduce the cost of stainless steel, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C22B1/24C22B23/00
CPCC22B1/16C22B1/24C22B23/005Y02P10/20
Inventor 朱德庆潘建郭正启李启厚
Owner CENT SOUTH UNIV
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