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Method for directly reducing ferronickel by tunnel kiln using laterite-nickel ore as raw material

A technology of laterite nickel ore and tunnel kiln, which is applied in the field of reducing ferronickel, can solve the problems of high production cost, high carbon content in ferronickel, large investment, etc., and achieves low production cost, low carbon content and low equipment investment. Effect

Inactive Publication Date: 2008-10-08
章宇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method of using laterite nickel ore as a raw material to produce direct reduction ferronickel with a tunnel kiln, which can solve the problems of large investment, high production cost, and production problems in smelting ferronickel in blast furnaces and in smelting ferronickel in electric furnaces. The problem of high carbon content in ferronickel

Method used

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Effect test

specific Embodiment approach 1

[0006] Specific embodiment one: the method of the present invention is finished like this: choose laterite nickel ore as raw material, in described laterite nickel ore raw material, the quality of nickel accounts for 0.75~2.60% of laterite nickel ore gross mass, and the quality of iron accounts for laterite nickel ore 8.00% to 55.0% of the total mass of the ore; the lateritic nickel ore and the reducing agent are loaded into a reduction tank according to a weight ratio of 1.00:0.25 to 0.55, and then the reduction tank is put into a tunnel kiln. Thermal drying, heating reduction (roasting), cooling, kiln exit, crushing, magnetic separation, and briquetting to obtain qualified direct reduced ferronickel. In this embodiment, the reducing agent is coal powder or coke powder.

specific Embodiment approach 2

[0007] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in this embodiment, the quality of nickel in the laterite nickel ore raw material accounts for 0.75% to 1.49% of the total mass of laterite nickel ore, and the quality of iron accounts for 35% to 55% of the total mass of laterite nickel ore (belonging to low nickel and high iron); the laterite nickel ore and reducing agent are loaded into the reduction tank according to the ratio of 1:0.45 to 0.55 by weight, and then the reduction tank is put into In the tunnel kiln, the reduction tank is preheated and dried at a temperature of 700-900°C for 5-9 hours; for heating reduction, the temperature for heating and reduction is 900-1180°C for 10-18 hours; for cooling, the cooling temperature 300~500 ℃, time is 6~9h; The reduced ferronickel obtained in the present embodiment, wherein the quality of nickel accounts for 1.3~3.3% of the total mass of reduced ferronickel, and the quality of...

specific Embodiment approach 3

[0008] Specific embodiment three: the difference between this embodiment and specific embodiment one is: in this embodiment, the quality of nickel in the laterite nickel ore raw material accounts for 1.5% to 2.6% of the total mass of laterite nickel ore, and the quality of iron accounts for 35-55% of the total mass of laterite-nickel ore (belonging to high-nickel-high-iron); put laterite-nickel ore and reducing agent into the reduction tank according to the weight ratio of 1:0.45-0.55, and then put the reduction tank into the tunnel kiln Among them, the reduction tank is preheated and dried, the preheating and drying temperature is 700-900°C, and the time is 5-9h; heating reduction, the heating reduction temperature is 900-1180°C, and the time is 10-18h; cooling, the cooling temperature is 300 ~500 ℃, time is 6~9h; The reduced ferronickel obtained in this embodiment, wherein the quality of nickel accounts for 2.5~5.5% of the total mass of reduced ferronickel, and the quality of...

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Abstract

A method of using nickeliferous laterite to reduce ferronickel directly in tunnel kiln relates to a method of reducing ferronickel. Comparing with high furnace smelting ferronickel and electric furnace smelting ferronickel having problems such as great invest, high manufacturing cost and produced ferronickel with high carbon content, the method of the invention is finished as: selecting nickeliferous laterite as material, the nickeliferous laterite contains 0.75-2.60% by weight of nickel, 8.00-55.0% by weght of iron; adding weight ratio of nickeliferous laterite and reductant as 1.00:0.25-0.55 into reducing pot, then putting the reducing pot in tunnel kiln, through preheating and stoving, heating reducing, cooling, taking off to get qualified reduced directly nickeliferous laterite. The invention selects natural nickeliferous laterite as material to reduce nickeliferous laterite, having advantages such as technology which easy to control, simple operation, low dissipation of energy, environment protection without pollution, low manufacturing cost, low installion cost and produced ferronickel with low carbon content.

Description

technical field [0001] The invention relates to a method for reducing ferronickel. Background technique [0002] At present, the world's proven nickel resources are about 160 million tons, of which 30% are sulfides and 70% are laterite nickel ores. Nickel is mainly used in fields such as stainless steel, electroplating, and alloys, among which the application of nickel in the field of stainless steel accounts for 65%. With the development of my country's stainless steel industry, the growth rate of nickel application will reach 7%. Stainless steel scrap is the main raw material for stainless steel smelting, but the recovery rate is only 45%, so resources are tight. Laterite nickel ore can produce nickel oxide, sulfur nickel, and ferronickel, among which sulfur nickel and iron nickel can be used by nickel refineries. The use of ferronickel is not only convenient for the manufacture of stainless steel, but also reduces production costs, and the direct reduction of ferronick...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/04C22C1/00C22B5/10
Inventor 章宇
Owner 章宇