CN101638703B - Method for directly reducing nickel containing pig iron by lateritic nickel in tunnel kiln - Google Patents
Method for directly reducing nickel containing pig iron by lateritic nickel in tunnel kiln Download PDFInfo
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- CN101638703B CN101638703B CN2009101693995A CN200910169399A CN101638703B CN 101638703 B CN101638703 B CN 101638703B CN 2009101693995 A CN2009101693995 A CN 2009101693995A CN 200910169399 A CN200910169399 A CN 200910169399A CN 101638703 B CN101638703 B CN 101638703B
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Abstract
The invention relates to a method for directly reducing nickel containing pig iron by lateritic nickel in a tunnel kiln, which is finished according to the following steps: firstly, adding desiccant into the lateritic nickel which contains adsorbed water, uniformly stirring and mixing for dehydrated desiccation; secondly, crushing the mixture, adding a reducing agent and a pig iron aggregation agent into the mixture, uniformly mixing, delivering the mixture on a tunnel kiln trolley on which an isolating agent is sprayed, and coating a layer of coke powder for carrying out reduction roasting; and thirdly, after reduction roasting, water quenching and cooling, crushing and sorting big iron blocks and small iron slag, self-milling the big iron blocks and the small iron slag in an autogenousmill, thereby leading iron containing pig iron alloy and mineral slag to completely separate to obtain nickel containing pig iron alloy. The invention does not use the traditional reduction jar and has simple production, short reduction time, high yield, convenient operation, energy consumption reduction, low cost and high recovery rate of nickel. The produced nickel containing pig iron can be directly used as high quality raw materials for smelting stainless steel.
Description
Technical field:
The invention belongs to the Non-ferrous Metallurgy field, particularly utilize the method for red soil nickel ore direct reduction nickel-contained pig iron in tunnel.
Background technology:
Development along with society; The progress of science and technology, stainless steel is used widely in the world, and traditional nickel master metal will be extracted from nickel sulfide ore; But its 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 about 80%.
The technology of extracting metallic nickel in the present red soil nickel ore in the world has three kinds.That is: thermal process, wet processing, fiery wet method combined process.Wherein thermal process is mainly blast furnace and rotary kiln-electrosmelting.The outer reducing and smelting ferronickel technology of stove, blast-furnace smelting and tunnel kiln reduction---electrosmelting not only require the grade of red soil nickel ore to want high, and need to consume a large amount of energy, and the silicon magnesium ratio of raw material is also had requirement.Wet processing, i.e. sulfuric acid pressure leaching process is though realized suitability for industrialized production at present; But because it adopts condition of high voltage operation, to equipment, scale, invest, control and ore grade, Natural manganese dioxide etc. have higher requirement, especially in sulfuric acid expensive today; Extract metallic nickel with pickling process; Not only cost is high, and produces a large amount of waste liquids, can cause severe contamination to environment.Fire wet method combined process mainly is a raw ore reduction roasting-ammonia leaching technology, the processing low-grade red soil nickel ore, but the recovery is low, cost is high, has belonged to superseded technology.Above-mentioned processing unit is not only invested greatly, energy consumption is many, and its ferronickel grade of producing is also lower.At present domestic have some areas to utilize the blast-furnace smelting Rhometal, and same the existence invested the shortcoming big, that tooling cost is high, and seriously polluted environment.
First to file to be raw material with the red soil nickel ore directly reduce the method (patent No.: CN 100424191C) of ferronickel with tunnel production.It is raw material that its technological process is chosen red soil nickel ore, and in the said red soil nickel ore raw material, the quality of nickel accounts for 0.75～2.60% of red soil nickel ore total mass, and the quality of iron accounts for 8.00～55.0% of red soil nickel ore total mass; Is that 1.00: 0.25～0.55 proportioning is packed in the reduction jar with red soil nickel ore and reductive agent according to weight ratio; The jar that will reduce is afterwards put into tunnel; The reduction jar is dried, is added thermal reduction, cooling, kiln discharge through preheating, passes through fragmentation, magnetic separation, briquetting again, obtains qualified direct reduction ferronickel.The direct reduction ferronickel that this method is produced is not only high to ingredient requirement, and the production cycle is long, and production efficiency is not high yet; Reduce not thorough, inhomogeneous; Oxidation easily must be handled by briquetting, influences the output and the quality of reduzate; The consumption and the heat conduction that have increased retort itself are slow, bring the high problem of energy consumption; Moreover above-mentioned method of reducing can not thoroughly solve slag iron and separate, and can only reach the purpose in enrichment ore deposit, in concentrate, still contains a large amount of gangues.
Summary of the invention
The objective of the invention is to overcome present defective workmanship; Provide a kind of red soil nickel ore in tunnel, directly to go back the method for original production nickel-contained pig iron, the red soil nickel ore reduction rate is accelerated, the production cycle shortens; Production efficiency increases substantially, and reaches the isolating nickel-contained pig iron of slag iron.
The present invention is the directly also method of original production nickel-contained pig iron, the completion according to the following steps in tunnel of a kind of red soil nickel ore: at first in containing the red soil nickel ore of planar water, add siccative, mix, red soil nickel ore is dehydrated; Broken above-mentioned compound then, add reductive agent and give birth to the ferronickel aggregating agent prepared therefrom, mix; , on tunnel chassis evenly spray one deck separant, on be sprayed with the chassis of separant, pile the red soil nickel ore after above-mentioned steps mixes again thereafter; And then on red soil nickel ore, cover one deck coke powder, install the tunnel chassis after, get into reducing roasting in the tunnel successively; Nickel-contained pig iron after the reducing roasting and slag are discharged in stove together, through shrend cooling, fragmentation; Autogenous grinding just can obtain nickel-contained pig iron.
The present invention compared with prior art, the technological process of production is short, and is simple to operate; Facility investment is few; Need not dry red soil nickel ore equipment, milling equipment, be pressed into the equipment of pelletizing equipment, dry pelletizing, saved the used retort of reduction red soil nickel ore simultaneously, improved the thermal conduction of red soil nickel ore; Changed the CO gas that produces in the conventional tunnel kiln retort; The method of reducing that in layer in the red soil nickel ore that is reduced, permeates, cause the recovery time long, production efficiency is low, the reduction not thorough, inhomogeneous, the consequence that reoxidizes easily.The CO that coke powder of on the tunnel chassis, spreading above the red soil nickel ore of heap shop and the burning of red soil nickel ore blended coke powder produce; Can directly act on the ectonexine of red soil nickel ore; The reduction of scattering and permeating from all directions to red soil nickel ore; Thereby accelerated the reduction rate of red soil nickel ore, shortened the recovery time, improved output and quality.
The reduction nickel-contained pig iron of producing is because carbon content is high and through fusion, reoxidizing property is not strong, so after discharge, can water essence method cool off, so without N
2With the protection of large-scale cooling cowl, used living ferronickel aggregating agent prepared therefrom has the catalysis congregation to iron and nickel in the reduction red soil nickel ore, and reduction rate is further accelerated, and changes the sintered molten state of red soil nickel ore.The present invention has that production technique is simple, facility investment is few, output is high, cost is low, energy-saving effect is remarkable, ferronickel recovery advantages of higher.
Concrete implementation:
The present invention is the method for a kind of red soil nickel ore direct reduction nickel-contained pig iron in tunnel; Accomplish according to the following steps: at first in red soil nickel ore (being raw ore), add siccative; Mix, said siccative is calcareous unslaked lime or magnesia unslaked lime, uses unslaked lime to make siccative; Not only solve the oven dry problem of red soil nickel ore, but also can be used as the sweetening agent that red soil nickel ore is produced nickel-contained pig iron.The consumption of siccative is 3～4% of a red soil nickel ore weight, the siccative of adding make red soil nickel ore dehydrate to humidity be water cut 11～16%.Then be broken into particle to the compound that dehydrates, particle size is maximum 3mm, adds reductive agent again and mixes with living ferronickel aggregating agent prepared therefrom.Said reductive agent is a carbonaceous reducing agent, adopts coal dust or coke powder, and the weight of carbonaceous reducing agent is 10～15% of raw ore weight; Described separant is siliceous fine sand; Said living ferronickel aggregating agent prepared therefrom is granular szaibelyite, gypsum, vermiculite, barium carbonate; Particle size is maximum 3mm; The weight of ferronickel aggregating agent prepared therefrom is 4～7% of raw ore weight, and wherein the weight ratio between szaibelyite, gypsum, vermiculite, the barium carbonate is 4: 1.5: 1: 1.The above-mentioned material that mixes without grinding, make ball, oven dry.On tunnel chassis equably spray one deck separant thereafter.Spraying one layer separant on the tunnel chassis is in order to prevent that nickel-contained pig iron is attached on the refractory brick of tunnel chassis.Then, the red soil nickel ore that on coke powder, mixes through above-mentioned steps on the heap, thickness is 250～400mm, and then on red soil nickel ore, covers the thick coke powder of one deck 20～25mm.On red soil nickel ore, cover coke powder, not only increased the reducing atmosphere in reduction red soil nickel ore and the tunnel, and red soil nickel ore reduction back remaining reductive agent and ash content are covered the reductive red soil nickel ore, stop air admission, anti-oxidation.After installing the tunnel chassis, get into reduction in the tunnel successively, temperature is controlled at 1250～1400 ℃, and the time is 4～6 hours.Under the effect of giving birth to the ferronickel aggregating agent prepared therefrom, carburizing under the high temperature forms nickel-contained pig iron.Nickel-contained pig iron after the reducing roasting and slag are discharged in kiln together, are cooled to 25～50 ℃ through water essence, the broken then letter sorting bulk pig iron, and the autogenous grinding of small dreg piece iron makes the nickel-contained pig iron alloy reach effectively with slag and separates, and just can obtain nickel-contained pig iron.
Embodiment 1:
(Ni1.01% TFe45%) mixes drying thoroughly with 3% calcareous unslaked lime, is crushed to below the 3mm with aqueous red soil nickel ore; Add the raw coal of going back of raw ore weight 15%, 7% living ferronickel aggregating agent prepared therefrom mixes, and on the tunnel chassis, sprays one deck separant then equably; And then the red soil nickel ore 250mm that mixes on the heap on be sprayed with the chassis of separant covers one deck coke powder 15mm on red soil nickel ore again, install the tunnel chassis after; Get into reduction in the tunnel successively; Temperature is controlled at 1250 ℃, and 6 hours recovery times, reducing roasting is after shrend cooling, broken, the letter sorting bulk pig iron, the autogenous grinding in autogenous mill of small dreg piece iron; The nickel-contained pig iron alloy is reached effectively with slag separate, obtain nickel-contained pig iron.Wherein nickel recovery 94.1%, iron recovery 95.2%.
Embodiment 2:
(Ni1.14% TFe42%) mixes drying thoroughly with 3.5% calcareous unslaked lime, is crushed to below the 3mm with aqueous red soil nickel ore; Add the raw coal of going back of raw ore weight 20%, 6% grain nickel iron aggregating agent prepared therefrom mixes, and on the tunnel chassis, sprays one deck separant then equably; And then the red soil nickel ore 300mm that mixes on the heap on be sprayed with the chassis of separant covers one deck coke powder 20mm on red soil nickel ore again, install the tunnel chassis after; Get into reduction in the tunnel successively; Temperature is controlled at 1350 ℃, and 5 hours recovery times, reducing roasting is after shrend cooling, broken, the letter sorting bulk pig iron, the autogenous grinding in autogenous mill of small dreg piece iron; The nickel-contained pig iron alloy is reached effectively with slag separate, obtain nickel-contained pig iron.The recovery 94.8% of nickel wherein, the recovery 95.5% of iron.
Embodiment 3:
(Ni1.2% TFe40%) mixes drying thoroughly with 4% magnesia unslaked lime, is crushed to below the 3mm with aqueous red soil nickel ore; The raw coal of going back that adds former weight 13%, 5% living ferronickel aggregating agent prepared therefrom mixes, and on the tunnel chassis, sprays one deck separant then equably; And then the red soil nickel ore 400mm that mixes on the heap on be sprayed with the chassis of separant covers one deck coke powder 25mm on red soil nickel ore again, install the tunnel chassis after; Get into reduction in the tunnel successively, temperature is controlled at 1400 ℃, 4 hours recovery times; Reduction pay for to be burnt after shrend cooling, broken, the letter sorting bulk pig iron, the autogenous grinding in autogenous mill of small dreg piece iron; The nickel-contained pig iron alloy is reached effectively with slag separates,, obtain nickel-contained pig iron.The recovery 95% of nickel wherein, the recovery 94.5% of iron.
Claims (2)
- One kind with red soil nickel ore in tunnel directly the reduction nickel-contained pig iron method, it is characterized in that it is to accomplish according to the following steps: at first in containing the red soil nickel ore of planar water, add siccative, mix, red soil nickel ore is dehydrated; Broken above-mentioned compound then, the compound after dehydrating is fractured into particle, and particle size is maximum 3mm; Add reductive agent and particle size again and be the living ferronickel aggregating agent prepared therefrom of 3mm to the maximum, mix; Thereafter, on the tunnel chassis, evenly spray one deck separant, separant is siliceous fine sand; Red soil nickel ore on be sprayed with the chassis of separant, piling again after above-mentioned steps mixes, the thickness of red soil nickel ore is 250-400mm; And then on red soil nickel ore, cover one deck coke powder, coke powder thickness is 20-25mm; After installing the tunnel chassis, get into reducing roasting in the tunnel successively, the reduction temperature in the tunnel is controlled at 1250-1400 ℃, and the time of reducing roasting is 4-6 hour; Nickel-contained pig iron after the reducing roasting and slag are discharged in stove together, through the shrend cooling, and fragmentation, autogenous grinding just can obtain nickel-contained pig iron;Wherein: said siccative is calcareous unslaked lime or magnesia unslaked lime, and the consumption of siccative is the 3-4% of red soil nickel ore weight; Said reductive agent is a carbonaceous reducing agent, adopts coal dust or coke powder, and the weight of carbonaceous reducing agent is the 10-15% of red soil nickel ore weight; Said living ferronickel aggregating agent prepared therefrom is szaibelyite, gypsum, vermiculite, barium carbonate, and the weight of giving birth to the ferronickel aggregating agent prepared therefrom is the 4-7% of red soil nickel ore weight, and the weight ratio between szaibelyite, gypsum, vermiculite, the barium carbonate is 4: 1.5: 1: 1.
- 2. method according to claim 1 is characterized in that: 55-60 ℃ of said shrend temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101693995A CN101638703B (en) | 2009-08-27 | 2009-08-27 | Method for directly reducing nickel containing pig iron by lateritic nickel in tunnel kiln |
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| CN2009101693995A CN101638703B (en) | 2009-08-27 | 2009-08-27 | Method for directly reducing nickel containing pig iron by lateritic nickel in tunnel kiln |
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| CN101638703A CN101638703A (en) | 2010-02-03 |
| CN101638703B true CN101638703B (en) | 2012-05-30 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101967570A (en) * | 2010-10-11 | 2011-02-09 | 大同市和合新能源科技有限责任公司 | Method for producing ferro-nickel alloy from red soil nickel ore |
| CN102828055A (en) * | 2012-09-18 | 2012-12-19 | 辽宁凯圣锻冶有限公司 | Method for producing nickel iron from lateritic nickel ore |
| CN102965521B (en) * | 2012-11-26 | 2013-11-20 | 罕王实业集团有限公司 | Method for nickel laterite ore through adopting wet pellet smelting lower temperature reduction mode |
| CN104611497A (en) * | 2015-01-19 | 2015-05-13 | 李成武 | Method for directly reducing nickel-bearing pig iron from laterite-nickel ore in thermal-storage nickel-iron tunnel kiln |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101037713A (en) * | 2007-04-29 | 2007-09-19 | 章宇 | Method for directly reducing ferronickel by tunnel kiln using laterite-nickel ore as raw material |
| CN101148686A (en) * | 2007-11-08 | 2008-03-26 | 唐山奥特斯窑炉有限公司 | Technique for directly reducing iron by using tunnel vehicle bottom type fast reducing furnace |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101037713A (en) * | 2007-04-29 | 2007-09-19 | 章宇 | Method for directly reducing ferronickel by tunnel kiln using laterite-nickel ore as raw material |
| CN101148686A (en) * | 2007-11-08 | 2008-03-26 | 唐山奥特斯窑炉有限公司 | Technique for directly reducing iron by using tunnel vehicle bottom type fast reducing furnace |
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Assignee: Lianyungang Dongmao Mining Co.,Ltd. Assignor: Mao Lisheng|Mao Naiwen Contract record no.: 2011320000438 Denomination of invention: Method for directly reducing nickel containing pig iron by lateritic nickel in tunnel kiln License type: Common License Open date: 20100203 Record date: 20110329 |
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Granted publication date: 20120530 Termination date: 20210827 |