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Method for directly reducing laterite-nickel ore to produce ferronickel alloy

A technology of lateritic nickel ore and nickel-iron alloy, which is applied in the field of metallurgy and chemical industry, can solve the problems of high ore smelting grade requirements, complex process path, and unrealistic industry, and achieve high ore smelting grade requirements, short process flow, and good product quality Effect

Inactive Publication Date: 2013-12-11
王晓彬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the common methods of producing ferronickel from laterite nickel ore include fire method, wet method, and fire-wet combination method. Although the three methods can smelt ferronickel, there are different shortcomings. High requirements and high energy consumption; the latter is complex process path, long process, high energy consumption, serious environmental pollution, and there is also a shaker for gravity separation after reduction grinding, which is very unrealistic in industry, although the current development of ferronickel Research is very active, but no better way to solve the above problems has been seen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: A method for directly reducing lateritic nickel ore to produce ferronickel:

[0023] (1), mix the raw ore of laterite nickel ore with carbonaceous reducing agent and compound additive, grind it into a ball mill, and filter the water in a vacuum without drying; wherein the carbonaceous reducing agent is composed of coconut shell powder and semi-coke; the compounded The additive is composed of coral stone powder, carnallite powder and dolomite powder; the weight ratio of each component to the ore is: coconut shell powder 6%, semi-carbon 4%, coral stone powder 5%, carnallite powder 3%, dolomite powder 5%; The degree of fineness of the ball mill is that particles with a particle size of 0.15mm account for more than 90%;

[0024] (2), after the mixture in the step (1) is evenly stirred, press balls, the water content of the pellets is 25-32%, and the size of the pellets is 15-25mm;

[0025] (3) Send the pellets of step (2) to the preheater, preheat at a temperat...

Embodiment 2

[0028] Example 2: A method for directly reducing lateritic nickel ore to produce ferronickel:

[0029] (1), mix laterite nickel ore with carbonaceous reducing agent and compound additives, grind it into a ball mill, and remove moisture through vacuum filtration without drying; wherein the carbonaceous reducing agent is composed of coconut shell powder and semi-coke; The composite additive is composed of coral stone powder, carnallite powder and dolomite powder; the weight ratio of each component to ore is: coconut shell powder 5%, semi-carbon 10%, coral stone powder 4%, carnallite powder 2%, dolomite powder 6%; raw materials After being ground by a ball mill, the particles with a particle size of 0.15mm account for more than 90%;

[0030] (2), after the mixture in the step (1) is evenly stirred, press balls, the water content of the pellets is 25-32%, and the size of the pellets is 15-25mm;

[0031] (3) Send the pellets of step (2) to the preheater, preheat at a temperature...

Embodiment 3

[0034] Example 3: A method for directly reducing lateritic nickel ore to produce ferronickel:

[0035] (1), mix laterite nickel ore with carbonaceous reducing agent and compound additives, grind it into a ball mill, and remove moisture through vacuum filtration without drying; wherein the carbonaceous reducing agent is composed of coconut shell powder and semi-coke; The composite additive is composed of coral stone powder, carnallite powder and dolomite powder; the weight ratio of each component to the ore is: coconut shell powder 6%, semi-carbon 4%, coral stone powder 6%, carnallite powder 4%, dolomite powder 7%; raw materials After being ground by a ball mill, the particles with a particle size of 0.15mm account for more than 90%;

[0036] (2), after the mixture in the step (1) is evenly stirred, press balls, the water content of the pellets is 25-32%, and the size of the pellets is 15-25mm;

[0037] (3) Send the pellets of step (2) to the preheater, preheat at a temperat...

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PUM

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Abstract

The invention discloses a method for directly reducing laterite-nickel ore to produce a ferronickel alloy, belonging to the technical field of metallurgy and chemistry. The method comprises the following steps of: (1) mixing the raw laterite-nickel ore with a carbonaceous reducing agent and a compound additive, and grinding in a ball mill; (2) uniformly stirring the mixture obtained by the step (1), and pelletizing; (3) feeding the pellets obtained by the step (2) into a preheater for preheating to remove natural moisture, and directly feeding the preheated pellets into a silicon nitride bonded silicon carbide reducing tank for reduction; and (4) performing water quenching grinding on the reduced product obtained by the step (3), and performing slag-iron separation by use of a magnetic separator to obtain the ferronickel alloy. By adopting the method disclosed by the invention, the reducing time is shortened, the production cost is reduced, the production efficiency is improved, and a new high-quality raw material is provided for smelting high-class nickel alloy particles; meanwhile, the production cost is only 1 / 3 of that of a traditional technology; and the technology has the advantages of large-scale continuous production, high automation degree and short technological flow.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and chemical industry, and in particular relates to a method for directly reducing laterite nickel ore to produce ferronickel alloy. Background technique [0002] Nickel is an important non-ferrous metal alloy element, mainly used for smelting stainless steel, nickel is used to produce stainless steel, nickel is a very large demand for stainless steel production enterprises, the usual production of nickel-based stainless steel needs to add 8wt-11wt% nickel, With the development of my country's stainless steel industry, the demand for nickel is also increasing day by day, and the nickel resources that can be exploited and utilized by humans are limited to nickel sulfide ore and laterite nickel ore (nickel oxide ore), of which 30% are nickel sulfide 70% of the mine is lateritic nickel ore. [0003] At present, the common methods of producing ferronickel from laterite nickel ore include fire method...

Claims

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Application Information

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IPC IPC(8): C22B5/02C22B5/10C22B1/243C22B23/00C22C33/04C22C38/08C22C35/00
Inventor 徐伟
Owner 王晓彬
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