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Method for directly reducing laterite-nickel into nickel-bearing ball iron in tunnel kilns

A technology of laterite nickel ore and tunnel kiln, which is applied in furnaces, furnace types, fluidized bed furnaces, etc., can solve the problems of affecting the yield and quality of reducing substances, increasing the consumption and heat conduction of reaction tanks, and low production efficiency, and shortening the reduction period. time, increased yield and quality, low production efficiency

Inactive Publication Date: 2009-09-23
毛黎生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct reduction of ferronickel produced by this method not only has high requirements on raw materials, but also has a long production cycle, low production efficiency, incomplete and uneven reduction, easy oxidation, and has to be processed in briquetting, which affects the output and quality of the reduced product. Increased consumption of the reaction tank itself and slow heat conduction, resulting in high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Mix the laterite nickel ore (Ni 1.01%, TFe 8.8%) with 5% calcareous quicklime and dry it, crush it to less than 5mm, add 16% of the original ore weight of reduced coal, and mix evenly with 7% nickel-iron agglomerating agent, and then Evenly spread a layer of 10mm coke powder on the tunnel kiln trolley, then pile 100mm of evenly mixed laterite nickel ore on top of the coke powder, and then cover a layer of 10mm coke powder on the laterite nickel ore, after installing the tunnel kiln trolley, Enter the tunnel kiln for reduction in turn, the temperature is controlled at 1250 ° C, the reduction time is 1 hour, after reduction roasting, it is cooled by water quenching, crushed, ball milled, and then magnetically separated by a 1500 Gauss magnetic separator to obtain nickel-containing granular iron, and its nickel grade It can reach 10.02%, and the recovery rate is 92.1%.

Embodiment 2

[0013] Mix the laterite nickel ore (Ni 1.14%, TFe 10.2%) with 6% calcareous quicklime, mix well and dry, crush it to less than 5mm, add 20% of the original ore weight of reduced coal, and mix evenly with 8% granular ferronickel aggregating agent, and then Evenly spread a layer of 11mm coke powder on the tunnel kiln trolley, and then pile 200mm of evenly mixed laterite nickel ore on the coke powder, and then cover a layer of 15mm coke powder on the laterite nickel ore. After installing the tunnel kiln trolley, Enter the tunnel kiln for reduction in turn, the temperature is controlled at 1350 ° C, the reduction time is 2 hours, after reduction roasting, it is cooled by water quenching, crushed, ball milled, and then magnetically separated by a 2500 Gauss magnetic separator to obtain nickel-containing granular iron, and its nickel grade It can reach 10.08%, and the recovery rate is 93.4%.

Embodiment 3

[0015] Mix the laterite nickel ore (Ni 1.2%, TFe 11.0%) with 6% magnesia quicklime, mix well and dry it, break it to less than 5mm, add 26% of the original weight of reduced coal, and mix evenly with 6% nickel-iron agglomerating agent, and then Spread a layer of coke powder 12mm evenly on the tunnel kiln trolley, then pile 300mm of evenly mixed laterite nickel ore on top of the coke powder, and then cover a layer of coke powder 20mm on the laterite nickel ore. After installing the tunnel kiln trolley, Enter the tunnel kiln for reduction in turn, the temperature is controlled at 1400 ° C, the reduction time is 3 hours, after reduction and burning, it is cooled by water quenching, crushed, ball milled, and then magnetically separated by a 2000 Gauss magnetic separator to obtain nickel-containing granular iron and its nickel content. The grade can reach 11.5%, and the recovery rate is 95.1%.

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Abstract

The invention relates to a method for directly reducing laterite-nickel into nickel-bearing ball iron in tunnel kilns, which is completed according to the following steps: firstly, laterite-nickel containing absorption water is added with dryers, then stirred uniformly and dewatered and dried; secondly, the mixture is broken up and added with reducing agents and particle ferronickel aggregation agents, mixed uniformly and sent onto a tunnel kiln trolley spread with coke powder, and then covered with a layer of coke powder for reducing roasting; the materials after reducing roasting are cooled and hardened by water, broken up, ball ground and subjected to magnetic separation, and then high-quality nickel-bearing ball iron alloy is obtained. The method does not use the traditional reduction pot, has the advantages of simple production, short reduction time, high yield, convenient operation, low energy consumption, low cost and high recovery ratio of nickel, and the produced nickel-bearing ball iron alloy particles can be directly used as the high-quality raw material for smelting stainless steel; and the method is applicable to laterite-nickel of various grades and various types.

Description

Technical field: [0001] The invention belongs to the field of non-ferrous metal metallurgy, in particular to a method for directly reducing nickel-containing granular iron in a tunnel kiln by using laterite nickel ore. Background technique: [0002] With the development of society and the advancement of science and technology, stainless steel has been widely used in the world. Traditional nickel metal is mainly extracted from nickel sulfide ore, but its resources can no longer meet the needs of society, forcing people to pay attention to nickel resources which account for about 80% of the earth. % of laterite nickel ore to extract metallic nickel. [0003] At present, there are three techniques for extracting metallic nickel from laterite nickel ore in the world. That is: fire process, wet process, fire-wet combined process. Among them, the fire process is mainly blast furnace and rotary kiln-electric furnace smelting. The reduction smelting process of ferronickel outside...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C22B5/10
Inventor 毛黎生
Owner 毛黎生
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