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Process for producing nickel iron in rotary kiln-blast furnace by using laterite nickle mine

A laterite nickel ore and rotary kiln technology, applied in the field of iron and steel metallurgy, can solve problems affecting normal production, complex processing equipment, complex processing technology, etc., and achieve the effects of improving nickel grade, reducing production process, and increasing reduction reaction speed

Inactive Publication Date: 2010-12-15
毛耐文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention can obtain high-grade nickel-cobalt concentrate, the processing equipment is more complicated and the cost is higher
[0009] The above inventions all have different invention characteristics, but before the laterite nickel ore enters the rotary kiln, the processing technology is complicated
Large equipment investment and high production cost
Especially the pressed pellets, the ore powder and coal ash formed by the continuous rolling and falling friction in the rotary kiln are oxidized by the furnace gas, so that the partially reduced laterite nickel ore powder is formed (FeO) and the coal ash of (SiO 2 ) to form iron silicate with a low melting point, resulting in a high-viscosity liquid phase sticking to the kiln, forming long and thick rings on the kiln skin, which affects normal production

Method used

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  • Process for producing nickel iron in rotary kiln-blast furnace by using laterite nickle mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: the laterite nickel ore (Ni1.01, Tfe8.8%) containing water is mixed with 5% calcareous quicklime and dried, broken to below 5mm, adding the carbonaceous reductant of raw ore weight 8%, the nickel of 7% Mix the iron aggregating agent evenly, put it directly into the rotary kiln for reduction and roasting, the temperature is controlled at 980°C, after reduction and roasting, it is cooled by water quenching, crushed, ball milled, and then magnetically separated by a 1500 Gauss magnetic separator to obtain ferronickel concentrate powder, its nickel The grade can reach 10.2%, and the nickel recovery rate is 90.1%. Then the ferronickel concentrate powder is pressed into blocks and put into the iron furnace for smelting; 30% of the weight of the nickel-iron concentrate block is added with coke, and the temperature is controlled at 1400-1420°C. It takes 1 hour to smelt nickel-iron alloy, the nickel grade can reach 15.2%, and the nickel recovery rate is 93%.

Embodiment 2

[0018] Embodiment 2: the laterite nickel ore (Ni1.14, Tfe10.2) containing water is mixed with 7% calcareous quicklime and dried, broken to below 5mm, adding the carbonaceous reductant of 9% of raw ore weight, 8% of ferronickel The aggregating agent is mixed evenly, directly put into the rotary kiln for reduction roasting, the temperature is controlled at 970°C, after reduction roasting, it is cooled by water quenching, crushed, ball milled, and then magnetically separated by a 2500 Gauss magnetic separator to obtain ferronickel concentrate powder. The grade can reach 12.1%, the nickel recovery rate is 90.5%, and then the ferronickel concentrate powder is pressed into blocks, and then enters the iron furnace for smelting; 35% of the weight of the nickel-iron concentrate block is added with coke, and the temperature is controlled at 1400-1500°C. It takes 1.5 hours to obtain high-grade nickel-iron alloy, the nickel grade can reach 17.6%, and the nickel recovery rate is 94%.

Embodiment 3

[0019] Embodiment 3: the laterite nickel ore (Ni1.2, Tfe11.0%) containing water is mixed thoroughly with 6% magnesia quicklime and dried, broken to below 5mm, adding the carbonaceous reductant of raw ore weight 7%, the nickel of 6% The iron aggregation agent is mixed evenly, and it is directly put into the rotary kiln for reduction and roasting. The temperature is controlled at 1000°C. After reduction and roasting, it is cooled by water quenching, crushed, ball milled, and then magnetically separated by a 2000 Gauss magnetic separator to obtain ferronickel concentrate powder. The grade can reach 12.4%, the nickel recovery rate is 92%, and then the ferronickel concentrate powder is pressed into blocks, and then enters the iron furnace for smelting; 40% of the weight of the nickel-iron concentrate block is added with coke, the temperature is 1400-1480 ℃, the time After 1.2 hours, a high-grade nickel-iron alloy is obtained, and the nickel grade can reach 18.0%. The nickel recover...

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Abstract

The invention relates to a process for producing ferronickel by using nickeliferous laterite ore in an iron melting furnace of a rotary kiln, which comprises the following steps: firstly, adding desiccant in the nickeliferous laterite ore containing adsorption water, stirring and blending the mixture evenly, and dehydrating and drying the mixture; secondly, crushing the mixture, adding reducing agent and ferronickel aggregation agent, blending the mixture evenly and then sending the mixture to the rotary kiln to reduce and bake; thirdly, water quenching, cooling, crushing, ball milling and magnetically separating the reduced and baked material, so as to obtain high grade ferronickel concentrate; and finally pressing the ferronickel concentrate into blocks, adding the blocks into the iron melting furnace to smelt ferronickel alloy as a base raw material for smelting stainless steel. The process has the advantages of simple production, convenient operation, energy consumption saving, low cost, and high recycling rate of nickel. The process is suitable for the nickeliferous laterite ores with various grades and different types.

Description

Technical field: [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a process for producing ferronickel in a rotary kiln—iron furnace 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, and traditional nickel metal is mainly extracted from nickel sulfide ore. However, resources can no longer meet the needs of society, forcing people to extract metallic nickel from laterite nickel ore, which accounts for about 80% of the earth's nickel resources. [0003] At present, there are three kinds of processing technology of laterite nickel ore in the world. That is: fire process, wet process, fire-wet combined process. Among them, the pyrotechnic process is mainly blast furnace and rotary kiln-electric furnace smelting, reduction and smelting of ferronickel outside the furnace and other processes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/00C22B1/02B03C1/02
Inventor 毛耐文
Owner 毛耐文
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