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Process for briquetting oxidation pellets from laterite nickel ore

A technology of lateritic nickel ore and oxidized pellets, which is applied in the field of metallurgy to achieve the effects of reducing thermal and electrical energy consumption, increasing added value, and requiring low material particle size

Active Publication Date: 2014-03-26
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of needing pre-roasted raw materials in the prior art on the basis of not reducing the grade of nickel ore itself, and to provide a briquette process for direct reduction of oxidized pellets for production, especially a kind of laterite nickel Mineral briquetting ball oxidation pellet process

Method used

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  • Process for briquetting oxidation pellets from laterite nickel ore
  • Process for briquetting oxidation pellets from laterite nickel ore
  • Process for briquetting oxidation pellets from laterite nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take the laterite nickel ore, the total water content of the laterite nickel ore is 36.6%, the specific chemical composition: TFe: 39.4Wt%; FeO: 1.44Wt%; Ni: 1.23Wt%; CaO: 0.35Wt%; MgO: 5.34Wt %; SiO2: 10.09Wt%; Al2O3: 5.60Wt%; S: 0.01Wt%, trace P percentage content;

[0027] (2) Dry the laterite nickel ore to a moisture content of 15%, and crush it to a particle size below 3mm;

[0028] (3) Put 2% sodium sulfate and 8% limestone into the crushed laterite nickel ore and mix them;

[0029] (4) Press the mixed material into balls on the roller press machine, such as image 3 Shown: the pressed raw ball is a biconvex ball with a diameter of 10-20mm, such as figure 2 Shown: the angle α between the top of the convex surface and the edge is greater than 110 degrees, and the water content of the raw ball is 10-13%;

[0030] (5) Transport the green pellets to the shaft furnace for drying and roasting with waste heat according to the conventional process, and obtain the ...

Embodiment 2

[0032] (1) Use laterite nickel ore with a total water content of 36%, specific chemical composition: TFe: 20.13Wt%; FeO: 1.8Wt%; Ni: 1.66Wt%; CaO: 0.28Wt%; MgO: 9.21Wt%; SiO2: 27.07Wt%; Al2O3: 3.85Wt%; S: 0.006Wt%, trace P percentage;

[0033] (2) Drying the laterite nickel ore to a moisture content of 17%, and crushing to a particle size below 3mm;

[0034] (3) Put 4wt% sodium sulfate and 20wt% limestone into laterite nickel ore and mix;

[0035] (4) Press the mixture into balls on the roller press machine, such as image 3 Shown: The pressed green ball is a double convex ball with a diameter of 10-20mm, such as figure 2 Shown: The angle between the top of the convex surface and the edge is greater than 110 degrees, and the moisture content of the raw ball is 12-14%;

[0036] (5) Transport the green pellets to the shaft furnace for drying and roasting according to the conventional process to obtain finished oxidized pellets with an average compressive strength of more tha...

Embodiment 3

[0038] (1) Use laterite nickel ore with a total water content of 34%, specific chemical composition: TFe: 13.98Wt%; FeO: 1.08Wt%; Ni: 1.25Wt%; CaO: 0.28Wt%; MgO: 18.11%; SiO2: 30.08 Wt%; Al2O3: 1.28Wt%; the percentages of S and P are traces, and the test is carried out;

[0039] (2) Dry the laterite nickel ore to a moisture content of 17%, and crush the particle size to less than 3mm;

[0040] (3) 3wt% sodium sulfate and 15wt% limestone are mixed with laterite nickel ore;

[0041] (4) Press the mixture into balls on the roller press machine, such as image 3 Shown: the pressed green ball is a biconvex ball with a diameter of 10-20, such as figure 2 Shown: the angle α between the top of the convex surface and the edge is greater than 110 degrees, and the water content of the raw ball is 12-15%;

[0042] (5) Transport the raw pellets to the shaft furnace for drying and roasting according to the conventional process, and obtain the finished oxidized pellets with a compressive...

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Abstract

The present invention provides a process for briquetting production of oxidation pellets from low-grade laterite nickel ore. The process comprises: drying and crushing laterite nickel ore to obtain laterite nickel ore powder with a particle size of less than 3 mm; adding water and an additive to the laterite nickel ore powder, uniformly mixing to obtain a mixing material, and briquetting the mixing material into green pellets; and carrying out oxidation baking on the green pellets, and cooling to obtain the oxidation pellets. With the technical scheme, the low-grade laterite nickel ore can be utilized, and the briquetting process can be adopted to produce the oxidation pellets meeting the shaft furnace production indexes, such that the complete drying and pre-baking process produced by application of the pelletizing technology can be reduced, the heat energy consumption can be reduced, the oxidation pellets have high nickel content, and the added value is substantially increased.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a laterite nickel ore briquette oxidation pelletizing process. Background technique [0002] Lateritic nickel is rich in resources. There are 41 million tons of nickel metal in the world. The exploration cost is low, and the mining cost is extremely low. It can be used to produce ferronickel as a general steel raw material or as a nickel source for stainless steel. At present, rotary kiln drying pre-reduction-electric furnace reduction smelting, sintering-blast furnace sulfuration smelting and sintering-blast furnace reduction smelting are common pyrometallurgical methods for laterite nickel ore, among which rotary kiln drying pre-reduction-electric furnace reduction smelting method is the most important method for laterite nickel ore smelting. A method commonly used by factories. [0003] Patent CN201210203499.7 discloses a method for manufacturing laterite nickel ore pellet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/02
Inventor 吴道洪李胜利王敬慧
Owner SHENWU TECH GRP CO LTD
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