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Method for directly reducing nickel containing pig iron by lateritic nickel in tunnel kiln

A technology of laterite nickel ore and tunnel kiln, applied in fluidized bed furnaces and other directions, can solve the problems of affecting the yield and quality of reducing substances, increasing the consumption of reaction tanks, low production efficiency, etc. inefficient effect

Inactive Publication Date: 2010-02-03
毛黎生 +1
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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. Increase the consumption of the reaction tank itself and slow heat conduction, resulting in high energy consumption; moreover, the above reduction method cannot completely solve the separation of slag and iron, and can only achieve the purpose of enriching ore, and still contains a large amount of gangue in the concentrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Mix the water-containing laterite nickel ore (Ni1.01%, TFe45%) with 3% calcareous quicklime and dry it, crush it to below 3mm, add reduced coal with 15% of the original ore weight, and mix evenly with 7% raw nickel-iron agglomerating agent. Then evenly spray a layer of release agent on the trolley of the tunnel kiln, and then pile up 250mm of evenly mixed laterite nickel ore on the trolley sprayed with release agent, and then cover a layer of coke powder on the laterite nickel ore of 15mm. After the tunnel kiln trolley is finished, it enters the tunnel kiln for reduction in sequence. The temperature is controlled at 1250°C, and the reduction time is 6 hours. After reduction and roasting, it is cooled by water quenching, broken, and sorted into large pieces of pig iron and small pieces of slag iron in the autogenous mill. Self-grinding, so that nickel-containing pig iron alloy and slag can be effectively separated, and nickel-containing pig iron can be obtained. Among th...

Embodiment 2

[0014] Mix the water-containing laterite nickel ore (Ni1.14%, TFe42%) with 3.5% calcareous quicklime and dry it, crush it to less than 3mm, add 20% of the original ore weight of reduced coal, and mix evenly with 6% granular ferronickel aggregating agent. Then evenly spray a layer of release agent on the trolley of the tunnel kiln, and then pile up 300mm of evenly mixed laterite nickel ore on the trolley sprayed with release agent, and then cover a layer of coke powder on the laterite nickel ore of 20mm. After the tunnel kiln trolley is finished, it enters the tunnel kiln for reduction in sequence. The temperature is controlled at 1350°C, and the reduction time is 5 hours. After reduction and roasting, it is cooled by water quenching, crushed, and sorted into large pieces of pig iron and small pieces of slag iron in the self-mill Self-grinding, so that nickel-containing pig iron alloy and slag can be effectively separated, and nickel-containing pig iron can be obtained. Among t...

Embodiment 3

[0016] Mix the water-containing laterite nickel ore (Ni1.2%, TFe40%) with 4% magnesia quicklime and dry it, break it to less than 3mm, add 13% of the original weight of reduced coal, and mix evenly with 5% raw nickel-iron aggregating agent. Then evenly spray a layer of release agent on the trolley of the tunnel kiln, and then pile up 400mm of evenly mixed laterite nickel ore on the trolley sprayed with release agent, and then cover a layer of coke powder on the laterite nickel ore of 25mm. After the tunnel kiln trolley is finished, it enters the tunnel kiln for reduction in sequence. The temperature is controlled at 1400°C, and the reduction time is 4 hours. Intermediate self-grinding, so that nickel-containing pig iron alloy and slag can be effectively separated, and nickel-containing pig iron can be obtained. Among them, the recovery rate of nickel is 95%, and that of iron is 94.5%.

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Abstract

The invention relates to a method for directly reducing nickel containing pig iron by lateritic nickel in a tunnel kiln, which is finished according to the following steps: firstly, adding desiccant into the lateritic nickel which contains adsorbed water, uniformly stirring and mixing for dehydrated desiccation; secondly, crushing the mixture, adding a reducing agent and a pig iron aggregation agent into the mixture, uniformly mixing, delivering the mixture on a tunnel kiln trolley on which an isolating agent is sprayed, and coating a layer of coke powder for carrying out reduction roasting;and thirdly, after reduction roasting, water quenching and cooling, crushing and sorting big iron blocks and small iron slag, self-milling the big iron blocks and the small iron slag in an autogenousmill, thereby leading iron containing pig iron alloy and mineral slag to completely separate to obtain nickel containing pig iron alloy. The invention does not use the traditional reduction jar and has simple production, short reduction time, high yield, convenient operation, energy consumption reduction, low cost and high recovery rate of nickel. The produced nickel containing pig iron can be directly used as high quality raw materials for smelting stainless steel.

Description

Technical field: [0001] The invention belongs to the field of nonferrous metal metallurgy, in particular to a method for directly reducing nickel-containing pig 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 the f...

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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