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Double-combined method for producing ferronickel through magnetic separation-rotary kiln electric furnace (RKEF)

A magnetic separation, ferronickel technology, applied in the field of ferronickel production by magnetic separation-RKEF, smelting high-nickel molten iron, can solve the problems of low output, large coal consumption, power loss, etc., and achieve the effect of reducing costs

Pending Publication Date: 2016-04-06
广西北港新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using the RKEF method to smelt low-grade laterite ore, the amount of slag produced after roasting in the rotary kiln is large. In the stage of electric furnace smelting, heating the slag will cause a large power loss and low output; direct reduction in the rotary kiln, because both In consideration of achieving a good reduction effect and saving energy consumption, harsh temperature requirements will inevitably lead to ring formation in the kiln. While a large amount of manpower is required to deal with ring formation, this method also has low production efficiency and relatively low coal consumption. Bigger disadvantages
After magnetization and roasting in the rotary kiln, magnetic separation and enrichment are carried out, and the enriched products are mixed with other materials (carbon, flux, laterite, etc.) according to a certain ratio, and then sent to the RKEF rotary kiln for preheating, and then Hot charging is added to the electric furnace and then reduced, and the dual process technology for the separation of slag and iron has not been reported, which is a blank at home and abroad.

Method used

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  • Double-combined method for producing ferronickel through magnetic separation-rotary kiln electric furnace (RKEF)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Use TFe=14wt%, Ni=1.5wt% low-grade laterite nickel ore as raw material, sieve it, dry, make it account for more than 80% of particle size≤3mm, moisture content is 17%, then the laterite nickel The ore is evenly mixed with lime and anthracite, wherein by weight, laterite ore: anthracite: lime = 100:8:5, and then it is sent to the roasting rotary kiln for magnetization roasting reduction, and the temperature of the kiln head material (i.e. the discharge temperature) is controlled 950°C, the roasting temperature in the roasting stage is about 1250°C, and the roasting time is 55 minutes. The total time for the mixed materials to enter the roasting rotary kiln and leave the roasting rotary kiln is controlled at about 5 hours to obtain iron slag ore. After the roasting, the slag Slag type MgO / SiO 2 The mass ratio is 0.4;

[0047] 2) The above-mentioned iron slag ore is subjected to magnetic separation and enrichment to obtain selected slag-containing nickel-iron powder. T...

Embodiment 2

[0052] 1) Adopt TFe=14wt%, Ni=1.5wt% low-grade laterite nickel ore as raw material, sieve it, dry, make its particle size≤3mm account for more than 85%, moisture content is 18%, then laterite nickel The ore is mixed with dolomite and anthracite evenly, wherein by weight, laterite ore: anthracite: dolomite = 100:12:4, then it is sent to the roasting rotary kiln for magnetization roasting reduction, the temperature of the kiln head material is controlled at 1000 ° C, and the roasting The roasting temperature in the first stage is 1300°C, and the roasting time is 50 minutes. The total time for the mixed materials to enter the roasting rotary kiln and leave the roasting rotary kiln is controlled at about 5 hours to obtain iron slag ore. The slag-type MgO / SiO 2 The mass ratio is 0.35;

[0053] 2) The above-mentioned iron slag ore is carried out to magnetic separation and enrichment to obtain selected slag-containing ferronickel powder. The specific magnetic separation and enrichmen...

Embodiment 3

[0057] 1) Adopt TFe=14wt%, Ni=1.5wt% low-grade laterite nickel ore as raw material, sieve it, dry, make its particle size≤3mm account for more than 80%, moisture content is 19%, this laterite nickel The ore is mixed with lime and anthracite evenly. Among them, by weight, laterite ore: anthracite: lime = 100:13:3, and then it is sent to the roasting rotary kiln for magnetization roasting reduction. The temperature of the kiln head material is controlled at 1050 ° C. During the roasting stage The roasting temperature is 1350°C, and the roasting time is 40 minutes. The total time for the mixed materials to enter the roasting rotary kiln and leave the roasting rotary kiln is controlled at about 5 hours to obtain iron slag ore. The slag-type MgO / SiO2 The mass ratio is 0.31;

[0058] 2) The above-mentioned iron slag ore is carried out to magnetic separation and enrichment to obtain selected slag-containing ferronickel powder. The specific magnetic separation and enrichment process is...

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Abstract

The invention provides a double-combined method for producing ferronickel through a magnetic separation-rotary kiln electric furnace (RKEF). The double-combined method comprises the steps that lateritic ore is subjected to roasting reduction in a roasting rotary kiln to form magnetic iron slag ore; products obtained through magnetic concentration are subjected to RKEF rotary kiln burdening; after being preheated and prereduced in a RKEF rotary kiln, the iron slag ore and the products are together added into an electric furnace in a hot charging mode for heating melting and further reduction; and slag-iron separation is achieved, and crude liquid ferronickel is obtained. The double-combined method has the beneficial effects that slag is separated through a magnetic separation working procedure, so that a large amount of electric energy is saved; meanwhile, selected ferronickel powder obtained through concentration is added, so that the productivity of RKEF is improved, the cost of each ton of liquid high ferronickel is significantly reduced, and the crude liquid ferronickel meeting the composition requirements of into-furnace crude liquid ferronickel for argon oxygen decarburization furnace (AOD) smelting of stainless steel can be produced.

Description

technical field [0001] The invention belongs to the technical field of metallurgical technology, and relates to a method for smelting high-nickel molten iron, in particular, to a dual-link method for producing ferronickel by magnetic separation-RKEF, which is especially suitable for extracting low-poor-grade laterite nickel ore Smelting high-nickel molten iron. Background technique [0002] With the depletion of high-grade and easy-to-mining nickel sulfide ores and the rapid development of the domestic stainless steel industry, the utilization of low-grade laterite nickel ores has received more and more attention. The laterite nickel ore treatment process is mainly divided into hydrometallurgy process and pyrometallurgy process, but the relatively mature process of using laterite nickel ore to smelt ferronickel in the world is still dominated by pyrometallurgy. Among them, RKEF method and rotary kiln direct reduction method are widely used in pyrometallurgy. The main proce...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B4/06
CPCY02P10/20
Inventor 潘料庭何潮许严邦罗会建张秋艳
Owner 广西北港新材料有限公司
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