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Method for directly deoxygenizing ferro-nickel in shaft furnace by using laterite nickel ore as raw material

A technology for laterite nickel ore and raw materials, which is applied in the field of metallurgical manufacturing, can solve the problems of low degree of automation, high carbon content in ferronickel, and high production cost, and achieves easy process control, low carbon content in ferronickel, and small investment. Effect

Inactive Publication Date: 2009-12-16
章宇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a kind of method that uses laterite nickel ore as raw material to directly reduce ferronickel with a shaft furnace, to solve the problems of large investment, high production cost, low degree of automation, and nickel produced in the existing method for smelting ferronickel. The problem of high carbon content in iron and low production capacity

Method used

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specific Embodiment approach 1

[0006] Specific embodiment one: the method described in this embodiment is realized in this way: select laterite nickel ore as raw material, the quality of nickel in the laterite nickel ore raw material accounts for 0.75%~2.60% of the total mass of laterite nickel ore, and the quality of iron accounts for 8.00% to 55.0% of the total mass of the laterite nickel ore; the laterite nickel ore and the reducing agent are loaded into the shaft furnace according to the weight ratio of 1.00:0.08 to 0.25, and then preheated and dried, heated and reduced, and released from the furnace. After crushing, ball milling, magnetic separation, and briquetting, qualified direct reduced ferronickel is obtained; the preheating and drying temperature is 700°C to 900°C, and the preheating and drying time is 2h to 4h; the heating reduction temperature is 900°C ~1300℃, heating reduction time is 4h~8h. In this embodiment, the reducing agent is coal powder or coke powder. The crushing, ball milling, mag...

specific Embodiment approach 2

[0007] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the quality of nickel in the laterite nickel ore raw material described in this embodiment accounts for 0.75% to 1.49% of the total mass of laterite nickel ore, and the quality of iron accounts for 0.75% to 1.49% of the laterite nickel ore. 35.0% to 50.0% of the total mass of the ore (belonging to low nickel and high iron); the laterite nickel ore and reducing agent are loaded into the shaft furnace according to the ratio of 1:0.20 to 0.25 by weight, and the preheating and drying temperature is 800 ℃~900℃, the preheating and drying time is 3h~4h; the heating reduction temperature is 1000℃~1300℃, and the heating reduction time is 5h~8h. In the reduced ferronickel obtained in this embodiment, the mass of nickel accounts for 1.3% to 3.3% of the total mass of reduced ferronickel, and the mass of iron accounts for 70% to 95% of the total mass of reduced ferronickel.

specific Embodiment approach 3

[0008] Specific embodiment three: The difference between this embodiment and specific embodiment one is: the quality of nickel in the laterite nickel ore raw material described in this embodiment accounts for 1.50% to 2.60% of the total mass of laterite nickel ore, and the quality of iron accounts for 1.50% to 2.60% of the laterite nickel ore. 40.0% to 55.0% of the total mass of the ore (belonging to high nickel and high iron); the laterite nickel ore and reducing agent are loaded into the shaft furnace according to the ratio of 1:0.15 to 0.25 by weight, and the preheating and drying temperature is 700 ℃~800℃, the preheating and drying time is 2h~3h; the heating reduction temperature is 900℃~1200℃, and the heating reduction time is 4h~7h. In the reduced ferronickel obtained in this embodiment, the mass of nickel accounts for 2.5%-5.5% of the total mass of reduced ferronickel, and the mass of iron accounts for 75%-95% of the total mass of reduced ferronickel.

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Abstract

The invention provides a method for directly deoxygenizing ferro-nickel in a shaft furnace by using a laterite nickel ore as a raw material, which relates to a method for deoxygenizing the ferro-nickel. The method aims to solve the problems that the prior method for smelting the ferro-nickel has high investment, high production cost, low automation degree, high carbon content in the produced ferro-nickel and low productivity. The method comprises the following steps: selecting the laterite nickel ore as the raw material of which the mass of the nickel accounts for 0.75 to 2.60 percent of the total mass of the laterite nickel ore and the iron mass accounts for 8.00 to 55.0 percent of the total mass of the laterite nickel ore; and filling the laterite nickel ore and a reducing agent into the shaft furnace according to the weight ratio of 1.00:0.08-0.25, and then performing preheating and drying, heating deoxygenization, tapping, crushing, ball milling, magnetic separation and briquetting to obtain the qualified directly deoxygenized ferro-nickel, wherein the preheating and drying temperature is between 700 and 900 DEG C, the preheating and drying time is between 2 and 4 hours, the heating deoxygenization temperature is between 900 and 1,300 DEG C, and the heating deoxygenization time is between 4 and 8 hours. The method has the advantages of less investment, high productivity, stable process, simple operation, low carbon content in the produced ferro-nickel, high degree of mechanization, and low operating cost.

Description

technical field [0001] The invention relates to a method for reducing ferronickel, belonging to the technical field of metallurgical manufacture. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02
Inventor 章宇
Owner 章宇
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