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Method for producing ferronickel by utilizing low-magnesium intermediate type laterite nickel ore

A technology of lateritic nickel ore and ferronickel, applied in the direction of improving process efficiency, can solve problems such as difficult to handle, unsuitable for wet process technology, high iron and low magnesium, and achieve high production efficiency

Inactive Publication Date: 2009-12-16
巧家奥鑫资源再生利用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The typical Yuanjiang laterite belongs to the low-nickel grade C2 laterite nickel ore. Its notable feature is that compared with the magnesia silicate laterite nickel ore suitable for the fire AC electric furnace nickel-iron process, its iron content is high and magnesium content is low. ; Compared with the limonite-type lateritic nickel ore of the acid leaching wet process, its magnesium and iron are low. The high iron-silicon ratio (0.38-0.5) makes the traditional AC electric furnace smelting fire process difficult to handle

Method used

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  • Method for producing ferronickel by utilizing low-magnesium intermediate type laterite nickel ore
  • Method for producing ferronickel by utilizing low-magnesium intermediate type laterite nickel ore
  • Method for producing ferronickel by utilizing low-magnesium intermediate type laterite nickel ore

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Embodiment 1

[0025] Roasting pre-reduction, after crushing, sieving, granulating, and drying, dry-based laterite nickel ore with a moisture content of less than 20% is mixed with about 10% anthracite and 6% CaO by weight for pre-reduction roasting treatment. Granular force is 5-10mm, time is 30-50 minutes, temperature is 800-900°C, iron reduction degree is controlled at 70% for smelting, that is, roasted calcine and recycled dust are mixed with a reducing agent with a weight ratio of 3%. Join the open-arc smelting in the transferred arc DC electric furnace. The slag was separated to obtain a ferronickel smelting product with Ni 8.52% and Fe 73.5%.

Embodiment 2

[0027] Roasting pre-reduction, after crushing, sieving, granulating, and drying, dry-based laterite nickel ore with a moisture content of less than 20% is mixed with about 10% anthracite and 7% CaO by weight for pre-reduction roasting treatment. Granular force is 5-10mm, time is 30-50 minutes, temperature is 800-900°C, iron reduction degree is controlled at 80% for smelting, that is, roasted calcine and recycled dust are mixed with a reducing agent with a weight ratio of 2%. Join the open-arc smelting in the transferred arc DC electric furnace. The slag was separated to obtain a ferronickel smelting product with Ni 10.34% and Fe 81.2%.

Embodiment 3

[0029] Roasting pre-reduction, after crushing, sieving, granulating, and drying, the dry basis laterite nickel ore with a moisture content of less than 20% is mixed with about 10% anthracite and 2% CaO by weight, and the pre-reduction roasting treatment is carried out. Granular force is 5-10mm, time is 30-50 minutes, temperature is 800-900°C, iron reduction degree is controlled at 70% for smelting, that is, roasted calcine and recycled dust are mixed with a reducing agent with a weight ratio of 1%. Join the open-arc smelting in the transferred arc DC electric furnace. The slag was separated to obtain a ferronickel smelting product with Ni 11.06% and Fe 80.42%.

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Abstract

The invention discloses a method for producing ferronickel by utilizing low-magnesium intermediate type laterite nickel ore, which sequentially comprises: (1) roasting pre-reduction: after pulverization, sieving, pelletization and drying, dry-based laterite nickel ore with moisture of less than 20 percent is mixed with 10 weight percent of anthracite and 2 to 7 weight percent of CaO; the mixture is subjected to pre-reduction roasting treatment; potency dimension of ore particles is between 5 and 10 mm; time is between 30 and 50 minutes; the temperature is between 800 and 900 DEG C; and reducing degree of iron is controlled to be between 70 and 80 percent; (2) smelting: roasted sand and reclaimed soot are mixed with 1 to 3.5 weight percent of a reducer; and the mixture is delivered to a transferred arc direct current furnace and subjected to open-arc-melting; and (3) slag separation: a ferronickel smelted product is obtained. The method uses direct current for power supply, generates electric arc with directional electronic flow between a cathode and an anode of an electric furnace, generates Joule heat through an electric arc resistor to heat a charging material so as to realize melting, can realize open-arc-melting or submerged-arc-melting according to the metallurgical characteristic of the charging material, is in particular suitable for melting the ferronickel by the low-magnesium intermediate type laterite nickel ore and has high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to a method for producing ferronickel by using a transferred arc direct current electric furnace and laterite nickel ore, that is, a low-magnesium intermediate laterite nickel ore. technical background [0002] Laterite nickel ore is one of the important sources of primary nickel resources. With the consumption of easily smelted nickel sulfide ore resources, the development and utilization of laterite nickel ore has been paid more and more attention, and it has begun to occupy an important market position, and will be in the near future. Occupy a dominant market position. [0003] The main production process of lateritic nickel ore smelting in the prior art can be divided into wet process and pyroprocess. Due to different ore-forming conditions and weathering degrees, the chemical composition of laterite-nickel ores varies greatly, resulting in different smelting...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22B5/10
CPCY02P10/20
Inventor 方喜彭勃
Owner 巧家奥鑫资源再生利用有限公司
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