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A method for smelting nickel-iron alloys by smelting reduction of laterite nickel ore

A technology of lateritic nickel ore and nickel-iron alloy, applied in the field of ferroalloy, can solve the problem of high energy consumption, achieve the effects of improving economic benefits, improving smelting process, and realizing recycling

Active Publication Date: 2016-02-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method separates roasting and pre-reduction independently, and the smelting reduction mentioned in this method is conventional reduction smelting, and the energy consumption is relatively high

Method used

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  • A method for smelting nickel-iron alloys by smelting reduction of laterite nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] like figure 1 Shown, the method for smelting nickel-iron alloy by smelting reduction of this laterite nickel ore, its specific steps are as follows:

[0023] (1) First, mix the laterite nickel ore crushed to a particle size of 5mm and lump coal with a particle size of 1mm according to a mass ratio of 40:1 to obtain a mixture, and then add the mixture to the preheater. Dry and pre-reduce for 2 hours to obtain hot ore powder. The laterite nickel ore is silicon-magnesium type laterite nickel ore. The content of Ni in the laterite nickel ore is 0.8wt.%, and the content of Fe is 8wt.%. The preheater has multi-level functions Cyclone preheater;

[0024] (2) After mixing the hot ore powder, pulverized coal and flux evenly, smelt reduction for 3 hours under the condition of bubbling oxygen-enriched hot air at a temperature of 1400°C. After the reaction is completed, nickel-iron alloy and slag can be obtained. The pulverized coal contains The carbon content is 80wt.%. The amou...

Embodiment 2

[0028] like figure 1 Shown, the method for smelting nickel-iron alloy by smelting reduction of this laterite nickel ore, its specific steps are as follows:

[0029] (1) First, mix the laterite nickel ore crushed to a particle size of 20mm and the lump coal with a particle size of 10mm according to the mass ratio of 50:2 to obtain a mixture, and then add the mixture to the preheater. Dry and pre-reduce for 5 hours to obtain hot ore powder, wherein the laterite nickel ore is silicon-magnesium type laterite nickel ore, the content of Ni in the laterite nickel ore is 2wt.%, and the content of Fe is 15wt.%. Chemical bed;

[0030] (2) After mixing the hot ore powder, pulverized coal and flux evenly, smelt reduction for 8 hours under the condition of bubbling oxygen-enriched hot air at a temperature of 1600°C. After the reaction is completed, nickel-iron alloy and slag can be obtained. The pulverized coal contains The carbon content is more than 70wt.%. The amount of pulverized coa...

Embodiment 3

[0034] like figure 1 Shown, the method for smelting nickel-iron alloy by smelting reduction of this laterite nickel ore, its specific steps are as follows:

[0035] (1) First, mix the laterite nickel ore crushed to a particle size of 15mm and lump coal with a particle size of 5mm according to the mass ratio of 45:1 to obtain a mixture, and then add the mixture to the preheater. Drying and pre-reduction for 4 hours to obtain hot ore powder, wherein the laterite nickel ore is a silicon-magnesium type laterite nickel ore, the content of Ni in the laterite nickel ore is 1wt.%, and the content of Fe is 10wt.%. The preheater is a cyclone with multi-level functions Preheater;

[0036](2) After mixing the hot ore powder, pulverized coal and flux evenly, smelt reduction for 6 hours under the condition of bubbling oxygen-enriched hot air at a temperature of 1500°C. After the reaction is completed, nickel-iron alloy and slag can be obtained. The pulverized coal contains The amount of c...

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Abstract

The invention relates to a method for smelting ferro-nickel through smelting reduction of laterite-nickel ore and belongs to the technical field of ferroalloy. Firstly the laterite-nickel ore and lump coal are uniformly mixed according to the mass ratio of (40-50):(1-2) to obtain a mixture; then the mixture is added into a pre-heater, and is dried and pre-reduced at the temperature of 900-1100 DEG C to obtain hot mineral powder; the hot mineral powder, the powdered coal and a fusing agent are uniformly mixed and then subjected to smelting reduction for 3-8h under the condition of feeding oxygen-rich hot air and at the temperature of 1400-1600 DEG C; the ferro-nickel and furnace slag can be obtained after the reaction ends. Compared with the existing roasting reduction smelting method, preheating and pre-reducing are achieved synchronously in the method, so that the process is optimized; in addition, the oxygen-rich hot air is fed during the process of smelting reduction, so that the energy consumption of the smelting is reduced.

Description

technical field [0001] The invention relates to a method for smelting nickel-iron alloy by smelting reduction of laterite nickel ore, which belongs to the technical field of iron alloy. Background technique [0002] Nickel is an important strategic resource for all countries, and is widely used in special steel, electroplating, petrochemical catalysts, battery materials and other fields. Among them, the nickel demand for stainless steel production accounts for 66% of the global nickel demand. At present, nickel sulfide ore is mainly smelted to obtain metal nickel at home and abroad, but the reserves of nickel sulfide ore are limited and most of them have been developed. There are abundant reserves of laterite nickel ore in the world, and the proven reserves of land-based nickel resources are about 230 million tons, of which laterite nickel ore accounts for 72.2%, with an average grade of 1.28%. In 1950, the proportion of nickel produced by laterite nickel ore was only 15%. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/60
Inventor 王华魏永刚李博胡建杭李孔斋李谦杜云鹏
Owner KUNMING UNIV OF SCI & TECH
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