CN101967529A - Method for producing nickel-containing pig iron by using rotary kilns - Google Patents
Method for producing nickel-containing pig iron by using rotary kilns Download PDFInfo
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- CN101967529A CN101967529A CN2010100427367A CN201010042736A CN101967529A CN 101967529 A CN101967529 A CN 101967529A CN 2010100427367 A CN2010100427367 A CN 2010100427367A CN 201010042736 A CN201010042736 A CN 201010042736A CN 101967529 A CN101967529 A CN 101967529A
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Abstract
The invention discloses a method for producing nickel-containing pig iron by using rotary kilns. The method comprises the following steps of: 1, pretreating, namely A, adding a drying agent and an alkali adjusting agent, and B, adding a carbon substance and a nickel-iron reduction catalyst; 2, reducing and smelting with a primary rotary kiln, namely A, pre-reducing, B, reducing the generated metal, and C, conveying CO displaced and reduced in the primary rotary kiln as a fuel of a gas generator through an air feeder to air and dehydrate raw ores; 3, cooling with a secondary cooling rotary kiln; 4, crushing; and 5, performing dry magnetic separation.
Description
Technical field
The present invention relates to a kind of Non-ferrous Metallurgy field, specifically relate to a kind of method of utilizing rotary kiln to produce nickel-contained pig iron.
Background technology
What existing technology and this patent were the most close is the technology that rotary kiln, tunnel furnace are produced sponge iron, the finished product that it obtains and this patent product basically identical, its rotary kiln, tunnel furnace are produced sponge iron cost height, reducing atmosphere is not easy control, reduction ratio is low, ball milling, magnetic plant investment that water directly cools off the liquid ferronickel of shrend are big, and environmental pollution is big.Existing in addition laterite nickel extracts the grade requirement height of the technology of metallic nickel to the nickel of red soil nickel ore, and the main energy consumption of blast-furnace smelting is a coke, the high consuming electric power of electrosmelting, it is serious that the method for soaking is refined environmental pollution, and the starting material loss is big when producing, and investment cost is big, complex process, it is wayward to keep the safety in production.
Summary of the invention
The object of the present invention is to provide a kind of finished product that can suitability for industrialized production is the nickel-contained pig iron of nickeliferous 5.5-18%, and it also contains the chromium element simultaneously, by being directly used in 304 series stainless steel manufacturings after the electric furnace refining.
For achieving the above object, the invention provides a kind of method of utilizing rotary kiln to produce nickel-contained pig iron, its concrete grammar is as follows:
The first step pre-treatment, it mainly comprises following method:
A, add siccative and alkaline conditioner: in the wet ore deposit of laterite nickel, press of siccative combination drying, the dehydration of the weight of raw ore according to the different adding of water content 3-6%; The material that mixes up after combination drying, the dehydration is milled down to about 5mm, and sieving then obtains the following breeze of 5mm; The major ingredient of its siccative is Wingdale and alkaline conditioner in this step, and red soil nickel ore is played drying and adjusts the effect of the pH value of compound, and the pH value of the material that mixes up is controlled at about 0.8, plays the effect that prevents sticking kiln;
B, add carbon species and ferronickel reduction catalyst: the carbon species of in breeze, press the different adding of the iron-holder 45-50% of compound; The carbon species major ingredient is coal dust and ferronickel reduction catalyst in this step, and it plays and makes ferronickel fast restore in the rev kiln;
Second step was utilized the retailoring of rev kiln, and it mainly comprises following method:
A, prereduction: the raw material that has added carbon species is directly sent into prereduction in the rev kiln, its temperature is controlled between 900-1100 ℃, recovery time is 4-5 hour, the hot gas flow countercurrent movement that raw material and coal combustion produced in kiln, raw material generates metal under the semi-melting condition in middle kiln, metallic growth is Fe, the Ni of 50-60%;
B, with the metallic reducing that generates: its temperature is controlled at 1200-1250 ℃, and 3 hours recovery times, retailoring is finished, and metallic growth is more than 90%, and the material frit metal that burns till is liquid Fe, Ni mixture;
C, CO that the displacement in the rev kiln is restored be as the fuel of gas electricity generator, and use for the air-dry dehydration of raw ore through fan;
The 3rd step utilized secondary to cool back the rotary kiln cooling, and it mainly comprises following method:
Because do not have refractory materials in the secondary cooling rotary kiln wall, the fused liquid material is directly sent into from the rev kiln, adds water at secondary rotary kiln outer wall it is cooled off, shrend becomes the living ferronickel of black, gives birth to the ferronickel temperature and is controlled at about 160-200 ℃;
The 4th step is broken, and it mainly comprises following method:
Living ferronickel from the secondary rotary kiln after the shrend is delivered on the crusher broken, will give birth to the broken fine grinding of ferronickel and become about 1-3mm;
The 5th step was done magnetic separation, and it mainly comprises following method:
Living ferronickel powder after the fragmentation is separated Rhometal with gravity treatment and dried magnetic separator from breeze, the ferronickel of separating is the sand-like particle of diameter 1-3mm, and carries the slag of 1-2% secretly, obtains the nickeliferous living ferronickel of 5.5-18% that is.
The invention has the advantages that: the reducing atmosphere in the control kiln that the art of this patent can be more stable, rate of recovery height, loss is few.And in the secondary rotary kiln, cool off shrend, technology is simple, production safety, easy to operate, energy consumption is low, cost of investment is low; Rotary kiln is produced the method for nickel-contained pig iron and use water-cooling process outside the kiln wall in cooling, liquid ferronickel is cooled to living ferronickel, broken back is done magnetic separation and is become high-quality living ferronickel, compared with prior art loss is few, technology is simple, production safety, easy to operate, energy consumption is low, cost of investment is low, the produce market demand is big.
Embodiment
Below in conjunction with following embodiment the present invention is further described:
Embodiment 1:
In red soil nickel ore (nickeliferous 2.02%, iron content 10.52%, moisture: add 3.1% Wingdale 15.1%) and alkaline conditioner mixes, be milled down to below the 5mm, the coal dust and the reducing catalyst that add raw ore weight 50%, directly send into prereduction in the rev kiln, temperature is controlled at 920-1090 ℃, smelting time is 265 minutes, and the hot gas flow countercurrent movement that raw material and coal combustion produced, raw material generate Fe2O3, Fe, Ni metal under the semi-melting condition in middle kiln.Through restoring, temperature is controlled at 1210-1250 ℃, and smelting time is 180 minutes, and the Restore All melting is finished, and cools off the living ferronickel that shrend becomes black through the secondary rotary kiln, and kiln temperature is controlled to be 160-180 ℃.Broken, ferronickel that magnetic separation is separated is the sand-like particle of diameter 1mm.Obtain nickeliferously being 14.55%, iron is 75.95% living Rhometal, the ferronickel rate of recovery 91%.
Embodiment 2:
In red soil nickel ore (nickeliferous 1.81%, iron content 15.34%, moisture: add 5.2% Wingdale 18.5%) and alkaline conditioner mixes, be milled down to below the 5mm, the coal dust and the reducing catalyst that add raw ore weight 47%, directly send into prereduction in the rev kiln, temperature is controlled at 920-1110 ℃, smelting time is 270 minutes, and the hot gas flow countercurrent movement that raw material and coal combustion produced, raw material generate Fe2O3, Fe, Ni metal under the semi-melting condition in middle kiln.Through restoring, temperature is controlled at 1190-1255 ℃, and smelting time is 175 minutes, and the Restore All melting is finished, and cools off the living ferronickel that shrend becomes black through the secondary rotary kiln, and kiln temperature is controlled to be 160-180 ℃.Broken, ferronickel that magnetic separation is separated is the sand-like particle of diameter 1mm.Obtain nickeliferously being 8.17%, iron is 76.31% to give birth to Rhometal, the ferronickel rate of recovery 84.93%.
Embodiment 3:
In red soil nickel ore (nickeliferous 1.45%, iron content 21.17%, moisture: add 7.6% Wingdale 20%) and alkaline conditioner mixes, be milled down to below the 5mm, the coal dust and the reducing catalyst that add raw ore weight 53%, directly send into prereduction in the rev kiln, temperature is controlled at 925-1130 ℃, smelting time is 280 minutes, and the hot gas flow countercurrent movement that raw material and coal combustion produced, raw material generate Fe2O3, Fe, Ni metal under the semi-melting condition in middle kiln.Through restoring, temperature is controlled at 1195-1245 ℃, and smelting time is 185 minutes, and the Restore All melting is finished, and cools off the living ferronickel that shrend becomes black through the secondary rotary kiln, and kiln temperature is controlled to be 160-185 ℃.Broken, ferronickel that magnetic separation is separated is the sand-like particle of diameter 1-3mm.Obtain nickeliferously being 5.82%, iron is 82.05% to give birth to Rhometal, the ferronickel rate of recovery 85.21%.
The present invention has that production technique is simple, production safety, easy to operate, the easy advantage of Production Flow Chart, energy consumption is low, cost of investment is low, after particularly handling through secondary rotary kiln process for cooling, when separating slag, do not need to drop into ball mill, select the dry-type magnetic extractor separation processes for use through after the fragmentation, utilize CO that the displacement in the rev kiln restores fuel simultaneously as gas electricity generator, reach through fan and use for the air-dry dehydration of raw ore, reduce the input ratio of siccative and carbon species.This patent is compared with similar technology, technology is simple, less investment, energy consumption is low, and cost is low, the economic benefit height, refrigerant when product can be directly as the high quality raw material of smelting stainless steel and as the molten steel melting, be applicable to various grades and dissimilar red soil nickel ores, made full use of the laterite nickel of various different qualities, improved the added value of red soil nickel ore, have favorable economic benefit and social benefit, marketing has a extensive future.
The above; it only is preferred embodiment of the present invention; be not that the present invention is done any pro forma restriction; though the present invention discloses as above with preferred embodiment; yet be not in order to limit the present invention; any those skilled in the art; in not breaking away from the technical solution of the present invention scope; when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations; in every case be the content that does not break away from technical solution of the present invention; according to technical spirit of the present invention to any simple modification that above embodiment did; equivalent variations and modification all still belong in the protection domain of technical solution of the present invention.
Claims (1)
1. method of utilizing rotary kiln to produce nickel-contained pig iron, it is characterized in that: its concrete grammar is as follows:
The first step pre-treatment, it mainly comprises following method:
A, add siccative and alkaline conditioner: in the wet ore deposit of laterite nickel, press of siccative combination drying, the dehydration of the weight of raw ore according to the different adding of water content 3-6%; The material that mixes up after combination drying, the dehydration is milled down to about 5mm, and sieving then obtains the following breeze of 5mm; The major ingredient of its siccative is Wingdale and alkaline conditioner in this step, and red soil nickel ore is played drying and adjusts the effect of the pH value of compound, and the pH value of the material that mixes up is controlled at about 0.8, plays the effect that prevents sticking kiln;
B, add carbon species and ferronickel reduction catalyst: the carbon species of in breeze, press the different adding of the iron-holder 45-50% of compound; The carbon species major ingredient is a coal dust and ferronickel reduction catalyst in this step, and it plays and makes ferronickel fast restore and prevent the effect of sticking kiln in the rev kiln;
Second step was utilized the retailoring of rev kiln, and it mainly comprises following method:
A, prereduction: the raw material that has added carbon species is directly sent into prereduction in the rev kiln, its temperature is controlled between 900-1100 ℃, recovery time is 4-5 hour, the hot gas flow countercurrent movement that raw material and coal combustion produced in kiln, raw material generates metal under the semi-melting condition in middle kiln, metallic growth is Fe, the Ni of 50-60%;
B, with the metallic reducing that generates: its temperature is controlled at 1200-1250 ℃, and 3 hours recovery times, retailoring is finished, and metallic growth is more than 90%, and the material frit metal that burns till is liquid Fe, Ni mixture;
C, CO that the displacement in the rev kiln is restored be as the fuel of gas electricity generator, and use for the air-dry dehydration of raw ore through fan;
The 3rd step utilized secondary to cool back the rotary kiln cooling, and it mainly comprises following method:
Because do not have refractory materials in the secondary cooling rotary kiln wall, the fused liquid material is directly sent into from the rev kiln, adds water at secondary rotary kiln outer wall it is cooled off, shrend becomes the living ferronickel of black, gives birth to the ferronickel temperature and is controlled at about 160-200 ℃;
The 4th step is broken, and it mainly comprises following method:
Living ferronickel from the secondary rotary kiln after the shrend is delivered on the crusher broken, will give birth to the broken fine grinding of ferronickel and become about 1-3mm;
The 5th step was done magnetic separation, and it mainly comprises following method:
Living ferronickel powder after the fragmentation is separated Rhometal with gravity treatment and dried magnetic separator from breeze, the ferronickel of separating is the sand-like particle of diameter 1-3mm, and carries the slag of 1-2% secretly, obtains the nickeliferous living ferronickel of 5.5-18% that is.
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| CN2010100427367A CN101967529A (en) | 2010-01-11 | 2010-01-11 | Method for producing nickel-containing pig iron by using rotary kilns |
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| CN2010100427367A CN101967529A (en) | 2010-01-11 | 2010-01-11 | Method for producing nickel-containing pig iron by using rotary kilns |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758085A (en) * | 2012-07-17 | 2012-10-31 | 中国钢研科技集团有限公司 | Method for producing nickel-iron alloy by smelting red earth nickel mineral at low temperature |
| 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 |
| CN106833745A (en) * | 2017-03-13 | 2017-06-13 | 安徽工业大学 | A kind of gasification of biomass and DRI co-production and additive therefor |
| CN107267746A (en) * | 2017-07-07 | 2017-10-20 | 沈阳有色金属研究院 | The method and its device of a kind of lateritic nickel ore direct-reduction-top blow smelting production ferronickel |
-
2010
- 2010-01-11 CN CN2010100427367A patent/CN101967529A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758085A (en) * | 2012-07-17 | 2012-10-31 | 中国钢研科技集团有限公司 | Method for producing nickel-iron alloy by smelting red earth nickel mineral at low temperature |
| CN102758085B (en) * | 2012-07-17 | 2013-11-06 | 中国钢研科技集团有限公司 | Method for producing nickel-iron alloy by smelting red earth nickel mineral at low temperature |
| 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 |
| CN106833745A (en) * | 2017-03-13 | 2017-06-13 | 安徽工业大学 | A kind of gasification of biomass and DRI co-production and additive therefor |
| CN106833745B (en) * | 2017-03-13 | 2018-04-10 | 安徽工业大学 | A kind of gasification of biomass and DRI co-production |
| CN107267746A (en) * | 2017-07-07 | 2017-10-20 | 沈阳有色金属研究院 | The method and its device of a kind of lateritic nickel ore direct-reduction-top blow smelting production ferronickel |
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Application publication date: 20110209 |