Ferro-nickel alloy production technology with laterite nickel ore processed through oxygen enrichment hot air shaft furnace

A technology of laterite nickel ore and oxygen-enriched hot air, applied in shaft furnaces, furnaces, furnace types, etc., can solve the problems of easy ring formation, low treatment efficiency and serious pollution of rotary kilns, and achieve strong adaptability of raw materials and high treatment efficiency. , the effect of simple production process

Inactive Publication Date: 2013-12-18
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

The traditional sintering-blast furnace process for treating laterite nickel ore (Nonferrous Metallurgy Design and Research, 2012, 33(5): 16) has the disadvantages of high energy consumption and serious pollution, and has been gradually eliminated. In recent years, the rotary kiln-electric furnace process The representative coal-based direct reduction process (such as Chinese patent 200910067714.3) has been widely used at home and abroad, but this process also has disadvantages such as process plant, high energy consumption, easy ring formation in the rotary kiln, and low processing efficiency.

Method used

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  • Ferro-nickel alloy production technology with laterite nickel ore processed through oxygen enrichment hot air shaft furnace

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022] The composition of laterite nickel ore selected is Ni: 1.30%, Fe: 25%; anthracite powder is used as reducing agent, its fixed carbon content is about 80%, ash content is about 12%, and volatile matter is about 8%; limestone powder is used as Flux, its CaO content is about 52%. Add the laterite nickel ore to the dryer for drying, and crush it to below 10 mesh by the crusher. Add anthracite powder, limestone powder and water according to the ratio of laterite nickel ore: anthracite powder: flux: water about 100:6:20:17 , mixed thoroughly, pressed into blocks under a pressure of not less than 20MPa, dried and put into the stock yard.

[0023] Put the dried laterite nickel ore pellets and coke into the shaft furnace, and blow oxygen-enriched hot air into the tuyere at the lower part of the shaft furnace. , release a lot of heat, this area is the highest temperature of the shaft furnace, the temperature can reach 2000 ℃. The high-temperature furnace gas generated by the tu...

Embodiment approach 2

[0026] The composition of laterite nickel ore selected is Ni: 1.80%, Fe: 20%; coke powder is used as reducing agent, its fixed carbon content is about 85%, ash content is about 13%, and volatile matter is about 2%; limestone powder is used as Flux, its CaO content is about 52%. Add the laterite nickel ore to the dryer for drying, and crush it to below 10 mesh by the crusher. Add coke powder, limestone and water according to the ratio of laterite nickel ore: coke powder: flux: water about 100:5:20:17, After fully mixing, press into blocks under a pressure of not less than 20MPa, and put them into the stockyard after drying. Put the dried laterite nickel ore pellets and coke into the oxygen-enriched hot blast shaft furnace for smelting, and the smelting process is similar to Embodiment 1.

[0027] In the nickel-iron alloy obtained in this example, the nickel content is 7-12%, the iron content is 84-89%, the iron yield is 60-80%, and the nickel yield is greater than 90%. The ga...

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Abstract

The invention discloses a ferro-nickel alloy production technology with laterite nickel ore processed through an oxygen enrichment hot air shaft furnace and belongs to the field of laterite nickel ore production. The technology is characterized in that the laterite nickel ore is main raw materials, a certain quantity of reducing agents, fusion agents and water are added, after complete mixing, a ball is formed by pressing through a ball press machine, after drying, the ball is sent into the oxygen enrichment hot air shaft furnace for smelting, finally nickeliferous molten iron, high-heat-value gas and slag are obtained, the nickeliferous molten iron is cast to form an ingot, ferro-nickel alloy is obtained, and the high-heat-value gas and the slag are cycled and used. The production technology has the advantages of being simple and easy to operate, raw material adaptability is strong, processing efficiency is high, different kinds of laterite nickel ore can be processed efficiently, the ferro-nickel alloy is produced, and meanwhile the high-heat-value gas generated in the smelting process can be used in a physical heat and chemical heat mode, the generated slag can be in resource utilization, and obvious economic benefit and environmental benefit are achieved.

Description

technical field [0001] The invention belongs to the field of laterite nickel ore production, and relates to a nickel-iron alloy production process, in particular to a process for producing nickel-iron alloy by using a shaft furnace to process laterite nickel ore. Background technique [0002] Nickel has the advantages of oxidation resistance, corrosion resistance, high temperature resistance, good ductility, and high strength. It is widely used in the production of key materials such as stainless steel and high-temperature alloy steel, and is an important strategic metal. The mineral resources of nickel are mainly divided into nickel sulfide ore and laterite nickel ore. Among them, nickel sulfide ore accounts for 30% to 40% of the nickel resources available for mining in the world, and nickel oxide ore accounts for 60% to 70%. Limited, and after long-term mining, its reserves have declined sharply, and it is facing an increasingly depleted situation. However, laterite nickel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02C21B11/02
Inventor 张建良毛瑞黄冬华刘征建袁骧张亚鹏王飞
Owner UNIV OF SCI & TECH BEIJING
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