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Method for jointly producing ferronickel in tunnel furnace-blast furnace from lateritic nickel

A laterite nickel ore and tunnel kiln technology, applied in chemical instruments and methods, solid separation, magnetic separation, etc., can solve problems such as increased cost of smelting ferronickel, increased acid consumption, and short process flow, achieving significant economic benefits and Social benefit, easy temperature control, and simple production process

Inactive Publication Date: 2009-03-25
毛耐文
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The pyrotechnic process mainly produces coarse ferronickel and high-nickel-sulfur products. This method consumes a lot of electricity and has requirements for the ratio of raw material silicon to magnesium, high energy consumption, large investment, and low grade; wet production is sulfuric acid atmospheric pressure leaching The process is suitable for processing lateritic nickel ore with low magnesium oxide content and high limonite content. Too high magnesium oxide content in the ore will increase acid consumption and increase production costs. Water is added to the ground for filtration to produce a large amount of tail liquid, which causes environmental pollution; the fire-wet combination process is mainly the raw ore reduction roasting-ammonia leaching process, which can process low-grade laterite nickel ore, smelting and recovering 85% of nickel, and high energy consumption , a process that will be eliminated
[0003] The process of smelting nickel oxide ore without crystal water by blast furnace (Patent No. 200510102984.5) and the process of smelting nickel oxide ore containing crystal water by blast furnace (Patent No. 200510102984. The invented nickel-chromite ore smelting nickel-iron pig iron process (Application No. 200510090886.4) has a short process flow and large continuous production capacity, and all the nickel-chromium-iron elements in the lateritic nickel ore can be extracted at one time, and the resource utilization rate is high. However, the sintered ore is not magnetic selection, the grade of ferronickel produced, especially the large amount of slag, high energy consumption, and increased cost of smelting ferronickel

Method used

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  • Method for jointly producing ferronickel in tunnel furnace-blast furnace from lateritic nickel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1. The chemical composition of laterite nickel ore raw materials is as follows; Ni 0.8-1.2% Mg 12.1-18.3% Fe 8.34-11.2% Ai 0.04-0.06% Si 18-24%

[0012] 2. Process conditions: Crush 10 kg of laterite nickel ore with a particle size of 0-3 mm, add calcium chloride or magnesium chloride 5% of the raw material weight, mix evenly, put it into an extrusion machine to form a rough billet, and put it into a reduction tank , then add 3KG of the above-mentioned reducing agent, fill in the gap in the reduction tank, and cover it. Put it into a tunnel kiln at a temperature of 1000-1300 ℃, keep the temperature constant for 5 hours, after reduction, pulverize, magnetically separate, and then press the magnetically separated material into balls for drying, and then enter the blast furnace for smelting to obtain high-grade nickel-iron alloy, nickel grade It reached 17.2%, and the nickel recovery rate reached 87.16%.

Embodiment 2

[0014] A. The chemical composition of laterite nickel ore is as follows: Ni 1.01-1.2% Mg 13.2-16.3% Fe 10.34-13.25% Ai 0.051-0.06% Si 13.2-16.7%

[0015] B. Process conditions: take lateritic nickel ore and crush it to 10 kg, with a particle size of 0-3mm, add 7% of the original ore weight of calcium chloride or magnesium chloride and mix evenly, put it into an extruder to form a rough billet, and put it into a reduction Then add 2.5KG of the above-mentioned reducing agent into the tank, fill in the gap of the reduction tank and cover it. After being placed in the tunnel kiln at a temperature of 1000-1300°C and kept at a constant temperature for 6 hours, the reduced laterite nickel ore is crushed and magnetically separated, and then the magnetically separated material is pressed into balls, dried, and put into a blast furnace to obtain high-grade nickel. The ore alloy has a nickel grade of 16.4% and a nickel recovery rate of 86.23%.

Embodiment 3

[0017] A. The chemical composition of laterite nickel ore is as follows: Ni 0.92-1.31% Mg 15.3-19.4% Fe 2.01-23.4% Ai 3.2-4.81% Si 12.1-15.3%

[0018] B. Process conditions: Take 10 kg of laterite nickel ore and crush it to a particle size of 0-3mm, add 8% of the original ore weight calcium chloride or magnesium chloride and mix evenly, put it into an extruder to form it, make a rough billet, put it into the reduction In the tank, add 2KG of the above-mentioned carbonaceous reducing agent, fill in the gap in the reducing tank, and add a cover. Put it into a tunnel kiln, keep the temperature at 1000-1300°C for 7 hours, crush the reduced laterite nickel ore, and magnetically separate it, then press the magnetically separated reduced material into balls, dry it, and enter it into a blast furnace for smelting to obtain high-grade nickel ore. The nickel-iron alloy has a grade of 18.3%, and the recovery rate of nickel is 85.96%.

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Abstract

The invention relates to a method for producing ferronickel in tunnel furnace-blast furnace from laterite-nickel ore. The technology is as follows: the laterite-nickel ore powder is crushed to reach a granularity of 0mm to 3mm; a catalyst is added pro rata, blended evenly, and filled into a reduction tank after press forming in an extruder; a reducing agent is added, roasting and reduction are carried out for 4h to 7h at the furnace temperature of 1000 DEG C to 1300 DEG C; the laterite-nickel ore after reduction goes through crushing and magnetic concentration; magnetic concentrating products are pressed to form balls; blast furnace smelting is adopted to obtain high-quality nickel mineral. The method has simple technology, strong adoptability of raw materials and low cost, overcomes the problems of high cost, low quality and few outcome existing in the traditional pyrogenic process for producing ferronickel, realizes a new technology for jointly processing laterite-nickel ore to produce ferronickel in tunnel furnace-blast furnace, reaches the purpose of large output, low energy consumption and high quality of ferronickel, and has notable economic and social benefits.

Description

Technical field: [0001] The invention belongs to the field of special steel smelting. Especially related to the method of joint production of ferronickel in tunnel kiln-blast furnace using laterite nickel ore Background technique: [0002] With the development of society and the progress of science and technology, stainless steel has been widely used in the world. The traditional nickel metal is mainly extracted from nickel sulfide ore, but the resources can no longer meet the needs of the society, forcing people to pay attention to the laterite nickel, which accounts for 80% of the earth's nickel resources. Nickel metal is extracted from the mine. At present, there are three kinds of processing technologies for laterite nickel ore in the world, namely: pyrotechnics, wet methods and combined pyro-wet methods. The pyrotechnic process mainly produces coarse ferronickel and high-nickel-sulfur products. This method consumes a lot of electricity and has requirements for the rat...

Claims

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Application Information

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IPC IPC(8): C22B23/02C22B1/14C22B1/02B03C1/02
Inventor 毛耐文毛黎生
Owner 毛耐文
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