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Process for preparing ferric-nickel from laterite-nickel ore

A lateritic nickel ore and process technology, applied in the field of metallurgy, can solve the problems of difficult separation of reduced roasted products, increased production costs, and low metal recovery rate, and achieve the goals of avoiding ring formation in rotary kilns, saving production costs, and improving roasting efficiency Effect

Active Publication Date: 2014-12-10
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

[0008] Aiming at the process of preparing ferronickel by direct reduction of rotary kiln in the prior art, there are a series of problems such as high energy consumption, increased production cost, difficulty in separating the reduced and roasted products, and low metal recovery rate. The purpose of the present invention is to provide a A kind of method that uses laterite nickel ore as raw material, low energy consumption, low cost, high metal recovery rate to prepare ferronickel

Method used

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  • Process for preparing ferric-nickel from laterite-nickel ore
  • Process for preparing ferric-nickel from laterite-nickel ore

Examples

Experimental program
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Effect test

Embodiment 1

[0047] After the laterite nickel ore is dried and crushed, it is mixed with 10% sodium sulfate, 5% lime, 5% lignite, and 3% starch glue in mass fraction, and then agglomerated. It is pre-reduced by shaft furnace gas, and the reduction gas of the shaft furnace comes from the rotary kiln. , so that the shaft furnace temperature reaches 650 ° C, the mass percentage of CO is 65%, the pre-reduction time is 2 hours, the reduction rate of NiO is 54.3%, the pre-reduction product in the shaft furnace is hot-packed in the rotary kiln, and the Reduction and roasting for 6 hours, the reduction products were water quenched, crushed, ore-grinded, and magnetically separated. The grinding fineness of 74 μm accounted for 90%, and the magnetic field strength was 1000Gs. The grades of nickel and iron in the obtained nickel-iron alloy product were 8.3% and 85.6%, respectively. The iron recoveries were 94.8% and 72.6%, respectively.

Embodiment 2

[0049]After the laterite nickel ore is dried and crushed, it is mixed with 7% sodium sulfate, 7% lime, 5% lignite, and 2% humic acid extracts to form agglomerates. It is pre-reduced by shaft furnace gas, and the shaft furnace reduces the gas From the rotary kiln, make the temperature of the shaft furnace reach 650 °C, the mass percentage of CO is 60%, the pre-reduction time is 2h, the reduction rate of NiO is 51.6%, the pre-reduction product in the shaft furnace is hot-charged in the rotary kiln, at 1000 Reduction and roasting at ℃ for 4 hours, the reduction product undergoes water quenching, crushing, grinding, and magnetic separation. The grinding fineness is 74 μm, accounting for 90%, and the magnetic field strength is 1000Gs. The grades of nickel and iron in the obtained nickel-iron alloy product are 8.5% and 83.9% respectively , nickel and iron recovery rates were 97.2% and 71.4%.

Embodiment 3

[0051] After the laterite nickel ore is dried and crushed, it is mixed with 13% sodium sulfate, 4% lime, 4% lignite, and 2% humic acid extract, and then agglomerated. It is pre-reduced by shaft furnace gas, and the shaft furnace reduces the gas From the rotary kiln, make the shaft furnace temperature reach 550°C, the mass percentage of CO is 50%, the pre-reduction time is 3h, the reduction rate of NiO is 47.3%, the pre-reduction product in the shaft furnace is hot-packed in the rotary kiln, at 1050 Reduction and roasting at ℃ for 5 hours, the reduction products were water quenched, crushed, ground, and magnetically separated. The grinding fineness was 74 μm, accounting for 90%, and the magnetic field strength was 1000Gs. The grades of nickel and iron in the obtained nickel-iron alloy products were 8.6% and 88.2% respectively. , nickel and iron recovery rates were 95.7% and 76.1%.

[0052] It can be seen from the above examples that by using the high temperature and high CO con...

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Abstract

The invention discloses a process for preparing ferric-nickel from laterite-nickel ore. The process comprises the following steps: crushing laterite-nickel ore, drying, adding an additive, a reducing agent, a solvent and a binding agent, uniformly mixing, briquetting, putting into a vertical furnace, performing pre-reducing roasting by using high-temperature fume in a rotary kiln, further putting into a coal medium in the rotary kiln, and performing reducing roasting, water quenching cooling and grinding and magnetic separation, thereby obtaining a powder ferric-nickel product with high nickel content. The process is short in procedure, simple to operate, low in energy consumption, low in cost and high in metal recycling rate, and the defects that the energy consumption is high, the metal recycling rate is low and the production cost is high when the ferric-nickel is prepared from reduced laterite-nickle ore directly in a conventional rotary kiln in the prior art are overcome.

Description

technical field [0001] The invention relates to a process for preparing ferronickel from laterite nickel ore, which belongs to the technical field of metallurgy. Background technique [0002] Nickel is an important strategic metal material with the characteristics of anti-corrosion, anti-oxidation, high temperature resistance, high strength and good ductility. It has a wide range of uses in modern industry, and is mainly used in the production of stainless steel. Due to the progress of steelmaking technology, steel mills that used pure nickel raw materials to smelt alloy steel and stainless steel have switched to non-pure nickel raw materials for production. As the high-grade and easy-to-mining nickel sulfide ore resources are decreasing day by day, the research on the dressing and smelting technology of laterite nickel ore has become the focus of attention at home and abroad, and it is also a global issue related to the healthy development of the nickel industry and the sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/08C22B1/216C22B23/02
Inventor 李光辉罗骏饶明军张元波李骞姜涛范晓慧陈许玲彭志伟朱忠平郭宇峰黄柱成杨永斌游志雄梁斌珺张鑫贾浩徐斌甘敏
Owner CENT SOUTH UNIV
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