CN101392330A

CN101392330A - Method for jointly producing ferronickel in tunnel furnace-blast furnace from lateritic nickel

Info

Publication number: CN101392330A
Application number: CNA2007101519152A
Authority: CN
Inventors: 毛耐文; 毛黎生
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-09-21
Filing date: 2007-09-21
Publication date: 2009-03-25

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

Red soil nickel ore is at tunnel furnace---the method for jointly producing ferronickel in the blast furnace

Technical field:

This genus belongs to the special steel field of smelting.Be particularly related to and utilize red soil nickel ore at tunnel furnace---the method for jointly producing ferronickel in the blast furnace

Background technology:

Along with social development, scientific-technical progress, stainless steel is used widely in the world, and traditional nickel master metal will be to extract in the nickel sulfide ore, but resource can not satisfy needs of society, forces people to extracting metallic nickel in the red soil nickel ore that takes up an area of ball nickel resources 80%.The treatment process technology of red soil nickel ore has three kinds in the world at present, that is: thermal process, wet method and fiery wet method combined process.Thermal process is mainly produced thick ferronickel and nickelic sulphur product, and this method cost need consume a large amount of electric energy, and raw silicon magnesium ratio is had requirement, and the energy consumption height, investment is big, grade is low; Wet production is that sulfuric acid normal pressure extract technology is suitable for handling the red soil nickel ore that content of magnesia is low, limonite content is high, the too high consumption that can increase acid of content of magnesia in the ore, improved production cost, and in removing foreign material and filtration nickelous sulfide process, need constantly add water filtration, produce a large amount of tail washings, cause environmental pollution; Fire wet method combined process mainly is raw ore reducing roasting one an ammonia soaking technology, can handle low-grade red soil nickel ore, smelts and reclaims nickel 85%, energy consumption height, the technology that genus will be eliminated.

The nickel oxide ore that does not contain crystal water of the Liu Shenjie of first to file invention through the technology (patent No. 200510102984.5) of blast-furnace smelting nickel and the nickel oxide ore that contains crystal water through the nickel chromium iron mining and metallurgy nickel metallurgy iron pig iron technology (application number 200510090886.4) of blast-furnace smelting ferronickel technology (patent No. 200510102984.X) and Liu Guanghuo invention though technical process lack, the continuous production amount is big, the disposable whole extractions of nickel chromium iron element in the red soil nickel ore, the resource utilization height, but because of not magnetic separation of agglomerate, the nickel chromium iron grade of producing, it is big particularly to go out the quantity of slag, the energy consumption height, the smelting ferronickel cost increases.

Summary of the invention

The invention provides a kind of red soil nickel ore at tunnel furnace---the novel process of jointly producing ferronickel in the blast furnace, it is simple to have production technique, adaptability to raw material is strong, temperature is evenly easy to control, both reasonable use the coal gas of blast furnace, solved the needed coal gas of tunnel kiln reduction again, after the red soil nickel ore process reduction magnetic separation, the grade of the ferronickel that has not only improved the output of blast furnace and produced, reduced smelting cost, simultaneously also reduce the cost of tunnel kiln reduction red soil nickel ore significantly, thereby make the red soil nickel ore after the reduction per ton reduce about 150 yuan.

A kind of red soil nickel ore of the present invention is at tunnel furnace---and the method for jointly producing ferronickel is finished according to the following steps in the blast furnace: with the red soil nickel ore fragmentation, the 5-10% catalyst mix that adds raw ore weight is even, the extrusion machine moulding of packing into, make crude green body, the crude green body of making is packed into adds the carbonaceous reducing agent of the 20-30% occupy crude green body weight in the reduction jar again.Go in the tunnel furnace intensification 1000-1300 ℃ the reduction that installs is canned, constant temperature 4-7 hour, the red soil nickel ore pulverizing after the reducing roasting, magnetic separation, compacting balling-up, oven dry enters blast-furnace smelting, after the smelting just ferronickel.

Described catalyzer is calcium chloride or magnesium chloride, and described tunnel kiln reduction temperature is controlled at 1000-1300 ℃.

Described carbonaceous reducing agent is the 5-10% of ore quality.

The present invention produces ferronickel with existing pyrogenic process and compares, and has that production technique is simple, easy to operate, temperature is easy to control, has utilized blast furnace gas scientifically and rationally, and production provides the cheap energy, cost to reduce significantly to tunnel furnace.Because red soil nickel ore after the reduction and process magnetic separation, improve the output of blast furnace greatly, reduced smelting cost, improved the grade of alloy Ni, be to utilize pyrogenic process to produce the method that the ferronickel cost is minimum, grade is the highest at present, have remarkable economic efficiency and social benefit.

Description of drawings: Fig. 1 is a process flow sheet of the present invention.

Embodiment:

Embodiment 1:

1, the Chemical Composition of red soil nickel ore raw material 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%

2, processing condition: with broken 10 kilograms of red soil nickel ore, granularity is that 5% calcium chloride or the magnesium chloride that 0-3mm adds raw material weight mixes the extrusion machine moulding of packing into, make crude green body, pack in the reduction jar, add the above-mentioned reductive agent of 3KG again, be filled in reduction jar interior gap, add a cover.Put into tunnel furnace under the temperature of 1000-1300, constant temperature 5 hours, after the reduction, pulverizing, magnetic separation with the material compacting balling-up oven dry of magnetic separation, enter blast-furnace smelting again, just obtain high-grade Rhometal, and the nickel grade reaches 17.2%, and nickel recovery reaches 87.16%.

Embodiment 2:

The Chemical Composition of A, red soil 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%

B, processing condition: get red soil nickel ore and be crushed to 10 kilograms, granularity is 0-3mm, and 7% calcium chloride or the magnesium chloride that add raw ore weight mix, the extrusion machine moulding of packing into, make crude green body, add the above-mentioned reductive agent of 2.5KG again in the reduction jar of packing into, add a cover the gap that is filled in the reduction jar.Put into behind the tunnel furnace under 1000-1300 ℃ the temperature, constant temperature 6 hours, the red soil nickel ore after the reduction is through pulverizing magnetic separation, with the material compacting balling-up of magnetic separation, oven dry enters blast furnace again, smelting obtains high-grade nickel minerals alloy, and the grade of its nickel reaches 16.4%, and the rate of recovery of nickel reaches 86.23%.

Embodiment 3:

The Chemical Composition of A, red soil 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%

B, processing condition: getting 10 kilograms of red soil nickel ores, to be crushed to granularity be 0-3mm, 8% calcium chloride or the magnesium chloride that add raw ore weight mix, the moulding in the extrusion machine of packing into, make crude green body, pack into the reduction jar in, add the above-mentioned carbonaceous reducing agent of 2KG again, be filled in reduction jar interior gap, add a cover.Put into tunnel furnace, under 1000-1300 ℃ temperature, constant temperature 7 hours, red soil nickel ore after the reduction is pulverized, magnetic separation, again the reducing material of magnetic separation is suppressed balling-up, is dried, enters blast-furnace smelting, obtains high-grade Rhometal, its grade 18.3%, the rate of recovery of nickel is 85.96%.

Claims

1, a kind of red soil nickel ore is at tunnel furnace---produce the method for ferronickel in the blast furnace, it is characterized in that following method finishes: red soil nickel ore is pulverized, add catalyzer, mix moulding in extrusion machine, pack into the reduction jar in reducing roasting, red soil nickel ore after the reduction is through pulverizing, magnetic separation, with magnetic separation thing compacting balling-up drying, adopt blast-furnace smelting, obtain ferronickel.

2, according to claims 1 described red soil nickel ore at tunnel furnace---produce the ferronickel method in the blast furnace, it is characterized in that described catalyzer is calcium chloride or magnesium chloride, the temperature of described tunnel kiln reduction roasting is controlled at 1000-1300 ℃, constant temperature 4-7 hour.

3, according to claims 1 described red soil nickel ore at tunnel furnace---produce the method for ferronickel in the blast furnace, it is characterized in that described red soil nickel ore is crushed to surmise is 0-3mm, described carbonaceous reductant is the 20-30% of raw ore weight, and described catalyzer is the 5-10% of raw ore weight.