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Method for directly reducing grain nickel iron in rotary kiln by using laterite nickle mine

A technology of laterite nickel ore and rotary kiln, applied in chemical instruments and methods, magnetic separation, solid separation and other directions, can solve the problems of complex processing technology, affecting normal production and high production cost, achieving simple production technology, improving nickel grade and Recovery rate, the effect of short production process

Inactive Publication Date: 2009-04-29
毛黎生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above-mentioned inventions all have different invention characteristics, but before the laterite nickel ore enters the rotary kiln, the processing technology is complicated. It needs to be crushed, mixed and milled, pelletized, and then sent to the rotary kiln for reduction after drying. The equipment is relatively complicated. The production cost is relatively high, especially the pressed pellets, the ore powder and coal ash formed by the continuous rolling and falling friction in the kiln are oxidized by the furnace gas, and the partially reduced laterite nickel ore powder is formed (FeO) and (SiO in coal ash 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, affecting normal production

Method used

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  • Method for directly reducing grain nickel iron in rotary kiln by using laterite nickle mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The water-containing laterite nickel ore powder (Ni1.41, Tfe8.8%) is mixed with 5% calcium quicklime and dried, crushed to less than 5mm, and 8% of the original ore weight is added with carbonaceous reducing agent and 7% of nickel iron aggregate The agent is evenly mixed and sent directly to the rotary kiln for reduction roasting, the temperature is controlled at 1260°C, and the reduction time is 3 hours. After reduction roasting, it is quenched with water, crushed and ball milled, and then magnetically separated by a 2000 Gauss magnetic separator to obtain nickel-iron particles. The nickel grade can reach 15.2%, and the nickel recovery rate can reach 90.1%.

Embodiment 2

[0017] Mix the water-containing laterite nickel ore (Ni1.68, TFe 10.2%) with 7% calcium quicklime and dry it, crush it to less than 5mm, add 9% of the original ore weight carbonaceous reducing agent, and 8% nickel-iron aggregates to mix It is uniform and directly enters the rotary kiln for reduction and roasting. The temperature is controlled at 1280℃. After reduction and roasting, it is water quenched, crushed, ball milled, and then magnetically separated by a 2200 Gauss magnetic separator to obtain granular nickel iron. The nickel grade can reach 17.6%. The recovery rate reached 90.5%.

Embodiment 3

[0019] The hydrated laterite nickel ore (Ni1.76, TFe11.0%) is mixed and dried with 6% magnesium quicklime, crushed to less than 5mm, and 7% carbonaceous reducing agent by weight of the original ore and 6% nickel-iron aggregates are added The mixture is uniformly mixed and directly enters the rotary kiln for reduction and roasting. The temperature is controlled at 1300℃. After reduction and roasting, it is quenched by water, crushed, ball milled, and then magnetically separated by a 2500 Gauss magnetic separator to obtain nickel-iron particles with a nickel grade of 18.0%. The recovery rate of nickel reaches 92%.

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Abstract

The invention relates to a method for directly reducing granular ferronickel by using nickeliferous laterite ore in 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; and finally, water quenching, cooling, crushing, ball milling and magnetically separating the reduced and baked material, so as to obtain high grade granular ferronickel alloy. The method has the advantages of simple production, convenient operation, energy consumption saving, low cost, and high recycling ratio of nickel. The produced granular ferronickel alloy grains can be directly used as a high-quality raw material for smelting stainless steel. The method is suitable for the nickeliferous laterite ores with various grades and different types.

Description

Technical field: [0001] The invention belongs to the field of non-ferrous metal metallurgy, and particularly relates to a method for directly reducing ferronickel from 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. Traditional nickel metal is mainly extracted from nickel sulfide ore, but its resources can no longer meet the needs of society, forcing people to take up about 80% of the earth’s nickel resources. % Of laterite nickel ore is extracted from metallic nickel. [0003] At present, there are three processes for extracting metallic nickel from laterite nickel ore in the world. Namely: fire process, wet process, and fire-wet combined process. The pyrotechnic process is mainly blast furnace and rotary kiln-electric furnace smelting. The process of smelting ferronickel by reduction outside the furnace not only requires high grade laterite nicke...

Claims

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Application Information

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IPC IPC(8): C22C1/00C22B1/02B03C1/02
Inventor 毛黎生
Owner 毛黎生
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