CN102719676B - Method for rapidly reducing copper slags to produce iron-copper alloys in kiln in reducing atmosphere - Google Patents

Method for rapidly reducing copper slags to produce iron-copper alloys in kiln in reducing atmosphere Download PDF

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CN102719676B
CN102719676B CN2012102106482A CN201210210648A CN102719676B CN 102719676 B CN102719676 B CN 102719676B CN 2012102106482 A CN2012102106482 A CN 2012102106482A CN 201210210648 A CN201210210648 A CN 201210210648A CN 102719676 B CN102719676 B CN 102719676B
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copper
iron
kiln
gas
oxygen
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CN2012102106482A
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CN102719676A (en
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倪文
陈锦安
王红玉
许冬
占寿罡
徐光泽
申其新
张玉燕
李克庆
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铜陵有色金属集团股份有限公司
北京科技大学
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    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

A method for rapidly reducing copper slags to produce iron-copper alloys in a kiln in a reducing atmosphere is characterized by including the steps: proportionally mixing the copper slags, reducing agents and additives, crushing or levigating the mixture to 200 meshes to obtain 20%-40% of residues on sieve; doping agglomerants and water occupying 5-20% of all materials on a dry mass basis, uniformly mixing, producing the uniformly mixed mixture to pellets with the diameters ranging from 15mm to 30mm and small cylindrical briquettes with all the heights ranging from 15mm to 30mm by a pellet press or a briquetting machine, and drying the pellets or small cylindrical briquettes; flatly laying the dried pellets or small cylindrical briquettes at the bottom of the kiln, wherein the material layer thickness ranges from 20mm to 45mm, the material layer reducing temperature ranges from 1250 DEG C to 1450 DEG C, and the reducing time is 10-40min; and subjecting the reduced pellets or the briquettes to cooling, crushing, wet grinding and wet separation so that iron-copper alloy powder with the iron recovery rate of 85%-99% is obtained. According to the method, iron in a great quantity of silicate iron in the copper slags, which cannot be separated out by the traditional technology, is extracted and turns into the iron-copper alloy micro powder with high added value so that iron and copper in the copper slags are extracted and used simultaneously, and physical and chemical heat energy in strong reducing waste gas can be completely recovered during rapid depth reduction.

Description

In a kind of reducing atmosphere kiln, the fast restore copper ashes is produced the method for iron-copper
Technical background
The present invention relates to the comprehensive utilization of resources field, a kind of method that fast deep reduction copper ashes is produced the iron-copper micro mist in the reducing atmosphere kiln is provided.
Copper smelting slag is called for short copper ashes.China produces approximately 1,000 ten thousand tons of copper ashes at present per year, and Some Enterprises selects extraneous copper again by it, and the copper ashes of the enterprise also had is because adopting water quenching technology to make extraneous copper wherein be difficult to select.Select in the copper ashes that copper processes still residual metallic copper 0.1% or more even adopted, and do not select the content of metallic copper in the copper ashes of copper processing can be up to 2%.Therefore in national copper ashes, approximately have 100,000 tons of metallic coppers to be wasted every year.In copper ashes except residual metal copper has higher value, also often contain 30%~50% iron, iron in copper ashes mainly exists with the form of ferric metasilicate, therefore adopts traditional beneficiation method iron wherein can not be enriched to the grade of the fine iron breeze of marketable value.The copper ashes of China is generally sold the batching of cement mill as calcining cement clinker in eastern region at present, allocate per-cent into generally 3%~5%, and west area is less due to cement production enterprise, can't consume the copper ashes of a large amount of outputs, and copper ashes is substantially in storing up state.Whole nation copper ashes is stored up and is reached more than 5,000 ten thousand tons.The actual boundary grade of China's current iron ore exploitation is 10%~30%, and the iron level in copper ashes is far away higher than the actual boundary grade of China's iron ore exploitation.But because the iron in copper ashes is mainly that form with ferric metasilicate exists, and cause traditional ore-dressing technique iron wherein can't be carried out to effective enrichment.Therefore no matter be to be sold to cement mill to abandon disposal as batching or the heap of calcining cement clinker, all cause the huge waste of copper resource and iron resources in this slag.
Purpose of the present invention is exactly that the extraneous copper in copper ashes and the form of a large amount of iron resourcess with the iron-copper micro mist are extracted, and makes the product extracted have higher value, creates economic benefit, environmental benefit and social benefit simultaneously.
The prior art be closely related most with the present invention is the reduction roasting magnetic separation of various refractory iron ores.
The patent that publication number is CN101161830A has been described a kind of deacidizing sintering process for powdered ore pulletizing; comprise pellet forming process and sinter process; adopt unique composition and engineering; under the prerequisite of producing qualified roasting ore deposit ball product; make the breeze can be for smelting iron and steel; take full advantage of and save natural resources, effective protection of the environment is also saved enterprise's production cost.This invention has only related to pellet forming process and sinter process, the ore deposit ball ferrous grade average out to 45%~63% after roasting, and such product can not directly be used for making steel.This technology does not provide after roasting the data of reduction ratio, abrasive grit size and the washability of iron in the ball of ore deposit.
The patent that publication number is CN101063181A has been described a kind of method of with rotary hearth furnace rapid reduction of carbonaceous auriferous pyrite, burning pelletizing Concentration of Gold and coproduction of iron powder, there is adaptability to raw material strong, easy to operate, uniform temperature fields, the production time is shorter, and the reaction times is fast, production efficiency is high, gold and iron recovery are high, and cost is low, the characteristics such as easily automatic control.But the iron in the related material of this technology is mainly ferric oxide, do not provide the method for controlling the ferric metasilicate reduction.This technology does not provide the effective ways how strong reduction rotary hearth furnace tail gas is processed yet, and advocates in existing country under the situation of energy-saving and emission-reduction and is difficult to industrializing implementation.In addition, three embodiment given in this technology are the processing about magnesia red soil nickel ore, and in the invention book, describe inconsistently, can't implement.
The patent that publication number is CN101413057A has been described a kind of low-grade and Complex Iron Ore method for efficiently separating, Complex Iron Ore stone classification to different grades and kind is processed, obtain drying and preheating after lump ore and breeze pelletizing, reducing roasting, cooling, ball milling, magnetic separation, ball milling, magnetic separation or reverse flotation, obtain iron ore concentrate or reduced iron powder.This patent is to adopt chain mat machine-shaft furnace process, at 900 ℃~1000 ℃, carries out weak reduction, and the raw material adopted is also to take low-grade iron ore that ferric oxide is main ferrous mineral, does not relate to the technology of controlling the ferric metasilicate reduction.In addition, this technology does not relate to the technical problem of week reduction tail gas recycling yet.
Summary of the invention
Purpose of the present invention mainly solves the core technology difficult problem of two aspects: the one, create the high temperature strongly reducing atmosphere of 1250 ℃~1450 ℃ in kiln, and utilize high temperature to reduce by force physics heat energy and the chemical heat energy of tail gas simultaneously; The 2nd, control the reaction process of material, under the effect of the additives such as lime, sodium carbonate by the Fe in ferric metasilicate 2+Cement out, be reduced into metallic iron more than 99%, control metallic copper and enter metallic iron, form the iron-copper micro mist, control iron-copper micro mist single particle size at 3~100um, so that follow-up wet-milling, wet method low intensity magnetic separation can be selected high-grade iron-copper micro mist with high-recovery simultaneously.
The invention provides fast deep reduction~wet magnetic separation combination treatment copper ashes on the reducing atmosphere kiln, produce the method for iron-copper micro mist.A kind of method that fast deep reduction copper ashes is produced the iron-copper micro mist in the reducing atmosphere kiln proposed by the invention, be comprised of four parts such as Kiln Control, batching, pelletizing or agglomeration, drastic reduction roasting and broken wet-milling-wet magnetic separations.
In order to control the strongly reducing atmosphere of kiln inside, the supply of kiln when burning air or oxygen or oxygen-rich air by during the supply complete combustion of fuel required whole air or oxygens or oxygen-rich air 40%~60%.The needed air or oxygen of above-mentioned perfect combustion or oxygen-rich air amount refer to the various carbon compounds 100% in fuel are transformed into to CO 2Needed Theoretical Calculation amount.
In order to make both to have kept than strongly reducing atmosphere in kiln, can make in kiln again to reach fast deep and reduce the required high temperature of 1250 ℃~1450 ℃, fuel gas and air or oxygen or oxygen-rich air all need to carry out the high temperature preheating processing.Fuel used gas is natural gas or coal-seam gas or petroleum gas or shale gas or coal gas.The pre-thermal recovery tubular heat exchanger of fuel gas and the high-temp waste gas that the drastic reduction kiln is discharged advance heat exchange, and the temperature of the fuel gas after preheating is 300 ℃~500 ℃.The pre-thermal recovery hotblast stove of air or oxygen or oxygen-rich air, the strong reducing property waste gas that hotblast stove adds the discharge of thermal recovery drastic reduction kiln acts as a fuel.Air or oxygen or oxygen-rich air are after the hotblast stove preheating, and temperature reaches 900 ℃~1300 ℃.By the preheating technique of above-mentioned fuel gas and air or oxygen or oxygen-rich air, realize high temperature and strong reducing environment in the drastic reduction stove like this, and will reduce by force physics heat energy and the chemical heat energy of waste gas and all recycle, eliminated CO in discharging waste gas, CH 4Deng atmosphere being there is to the unwanted component of strong pollution.
Batching in the present invention adopts the ratio of copper smelting slag, reductive agent, additive and binding agent to be, copper smelting slag: reductive agent: additive: binding agent=100:12~28:5~10:1~5.
The main chemical compositions of described copper smelting slag is: TFe:30%~50%, SiO 2: 30%~45%, Al 2O 3: 3%~8%, MgO:3%~5%, CaO:1%~5%, Cu:0.1%~1.2%, other: 0.1%~3%.TFe refers to FeO, Fe 3O 4, Fe 2O 3And the general name of contained whole Fe in simple substance Fe, not comprising the oxygen in its oxide compound, this is also the common practice on ore dressing and metallurgy.Described reductive agent is a kind of in coke powder, brown coal, bituminous coal, hard coal or combination that certain is several.Described additive is a kind of in Wingdale, lime, sodium carbonate, fluorite, industrial soda or combination that certain is several.Described binding agent is a kind of in clay, water glass, red mud, mud, organic binder bond or combination that certain is several.
Above-mentioned copper smelting slag, reductive agent and additive are mixed in proportion broken or levigate to 200 mesh screen residues 20%~40%, mix binding agent and the water that accounts for whole material butt quality 5~20%, mix and with ball press or briquetting press, make bead or the diameter of diameter 15mm~30mm and highly be the small column briquetting of 15mm~30mm afterwards, at the bottom of being laid in kiln after oven dry, bed thickness is 20mm~45mm, the reduction temperature of the bed of material is 1250 ℃~1450 ℃, and the recovery time is 10~40min.In pellet after reduction or material piece, in initial material, the existence form of various iron has 99%~99.8% to be reduced into metallic iron.Pellet after reduction or material piece obtain through cooling, broken, wet-milling, wet magnetic separation the iron-copper micro mist that iron recovery is 85%~99%, in products obtained therefrom, iron level is 88%~98%, copper content is 0.25%~0.95%, and granularity is 3~100um, can be used as the raw material of Smelting Weathering Steel.The tailings of wet-milling wet magnetic separation can be used as the raw material of clinker brick with central, and in copper ashes, the remaining valuable metal elements such as Pb, Zn are easy to volatilization due to the strong reducing environment of high temperature, can collect step by step, reclaim at the flue cooling section.
Beneficial effect of the present invention
1. the iron in the copper ashes that traditional technique of preparing and existing reduction roasting magnetic separation technology can't be selected in a large amount of ferric metasilicates extracts, and is transformed into the iron-copper micro mist with high added value;
2. compare with existing other reduction kiln reducing roasting techniques, when having realized the strong reducing environment of high temperature, also realized that high temperature reduces by force the physics heat energy of waste gas and the recycling of chemical heat energy, avoided to discharge CO and CH in atmosphere 4Etc. strong pollution gas, improved the utilising efficiency of the energy;
3. with existing oxidizing atmosphere kiln kiln furnitures sealing drastic reduction technology, compare, the recovery time has shortened more than 10 times, is conducive to raise the efficiency, and reduces costs;
4. realized two kinds of main valuable metals---extraction and application in the time of iron and copper in copper ashes, collected the valuable metals such as Pb, Zn of volatilization from flue, significant to the comprehensive utilization of copper ashes;
5. owing to the overwhelming majority of the metallic elements such as iron, copper, lead, zinc being removed in the tailings of wet-milling wet magnetic separation, be conducive to the friendly type clinker brick with central of tailings production environment.
The accompanying drawing explanation
Fig. 1 is that reducing atmosphere kiln of the present invention is processed the process flow sheet that copper ashes is produced the iron-copper micro mist.
Embodiment
With reference to Fig. 1, implement the present invention according to process flow sheet of the present invention, comprising:
1. raw material preparatory stage:
Copper ashes used, reductive agent (a kind of in coke powder, brown coal, bituminous coal, hard coal or the combination that certain is several), additive (a kind of in Wingdale, lime, sodium carbonate, fluorite, industrial soda or the combination that certain is several) is broken, levigate, to 200 mesh screen residues 20%~40%;
2. burden process:
As can be seen from Figure 1, the batching of this test comprises four parts: copper ashes, reductive agent, additive and binding agent.In the present invention, the proportioning of copper ashes, reductive agent, additive and binding agent is, copper ashes: reductive agent: additive: binding agent=100:12~28:5~10:1~5.
3. compounding process:
The raw material prepared in the 2nd step is mixed fully, guarantee that the material mixed is uniform;
4. pressure ball or briquetting operation
The material mixed is added to the water that accounts for whole material butt quality 5%~20%, stir simultaneously, with ball press, be pressed into the pelletizing of 15~30mm or make the bottom surface diameter and highly be the small column briquetting of 15~30mm with system section machine, and drying treatment.
5. feed and the reduction operation:
By after the pellet of compacting or material piece drying, inserting the reducing atmosphere kiln, carry out the drastic reduction roasting under certain reduction temperature, bed of material uniform spreading is at furnace bottom, during experience the process of preheating, heating and drastic reduction.Mixture mainly carries out drastic reduction at drastic reduction temperature band, and reduction temperature is 1250 ℃~1450 ℃, and the recovery time is 10~40min, treats that temperature drops to below 80 ℃, takes out material from this reducing atmosphere kiln.In pellet after reduction or material piece, in initial material, the existence form of various iron has 99%~99.8% to be reduced into metallic iron.
6. broken, wet-milling and wet magnetic separation operation:
As shown in Figure 1, pellet after reduction or material piece obtain through cooling, broken, wet-milling, wet magnetic separation the iron-copper micro mist that iron recovery is 85%~99%, in products obtained therefrom, iron level is 88%~98%, copper content is 0.25%~0.95%, granularity is 3~100um, can be used as the raw material of Smelting Weathering Steel.The tailings of wet-milling wet magnetic separation can be used as the raw material of clinker brick with central, and in copper ashes, the remaining valuable metal elements such as Pb, Zn are easy to volatilization due to the strong reducing environment of high temperature, can collect step by step at the flue cooling section, reclaim.
Embodiment 1
The present embodiment technical process is comprised of four parts such as Kiln Control, batching, agglomeration, drastic reduction roasting and broken wet-milling-wet magnetic separations.
In order to control the strongly reducing atmosphere of kiln inside, kiln when burning amount of supplied air by during the supply complete combustion of fuel required whole air 50%.The needed air of above-mentioned perfect combustion refers to the various carbon compounds 100% in fuel is transformed into to CO 2Needed Theoretical Calculation amount.
In order to make both to have kept than strongly reducing atmosphere in kiln, can make in kiln again to reach fast deep and reduce the required high temperature of 1350 ℃, fuel gas and air all need to carry out the high temperature preheating processing.Fuel used gas is Sweet natural gas.The pre-thermal recovery tubular heat exchanger of Sweet natural gas and the high-temp waste gas that the drastic reduction kiln is discharged advance heat exchange, and the temperature of the Sweet natural gas after preheating is 500 ℃.Preheating of air adopts hotblast stove, and the strong reducing property waste gas that hotblast stove adds the discharge of thermal recovery drastic reduction kiln acts as a fuel, and air is after the hotblast stove preheating, and temperature reaches 1200 ℃.By the preheating technique of above-mentioned fuel gas and air, realize high temperature and strong reducing environment in the drastic reduction stove like this, and will reduce by force physics heat energy and the chemical heat energy of waste gas and all recycle, eliminated CO in discharging waste gas, CH 4Deng atmosphere being there is to the unwanted component of strong pollution.
The batching of the present embodiment adopts the ratio of copper ashes, reductive agent, additive and binding agent to be, copper ashes: reductive agent: additive: binding agent=100:20:5.4:5.The main chemical compositions of copper ashes used is: TFe 41.15%, SiO 234.85%, Al 2O 33.80%, MgO 3.58%, and CaO 1.59%, and Cu 0.31%.Reductive agent used is brown coal, and additive therefor is lime, and binding agent used is Xylo-Mucine (CMC).
By above-mentioned copper ashes, brown coal and lime are mixed in proportion levigate to 200 mesh screen residues 20%, mix binding agent and the water that accounts for whole material butt quality 10%, mix and with briquetting press, make diameter and highly be the small column briquetting of 20mm afterwards, at the bottom of being laid in kiln after oven dry, bed thickness is 30mm, the reduction temperature of the bed of material is 1450 ℃, recovery time is 10min, material piece after reduction is through cooling, broken, wet-milling, wet magnetic separation obtains the iron-copper micro mist that iron recovery is 95.68%, in products obtained therefrom, iron level is 92.31%, copper content is 0.76%, granularity is 5~70um, can be used as the raw material of Smelting Weathering Steel.Wet-milling adopts primary grinding, and ore milling concentration is 65%, grinding fineness 200 mesh screen residues 2%; The wet magnetic separation magneticstrength is 60.8KA/m.The tailings of wet-milling wet magnetic separation can be used as the raw material of clinker brick with central, and in copper ashes, the remaining valuable metal elements such as Pb, Zn are easy to volatilization due to the strong reducing environment of high temperature, can collect step by step, reclaim at the flue cooling section.
Embodiment 2
The batching of the present embodiment adopts the ratio of copper ashes, reductive agent, additive and binding agent to be, copper ashes: reductive agent: additive: binding agent=100:20:5.4:5.The main chemical compositions of copper smelting slag used is: TFe: 41.15%, SiO 2: 34.85%, Al 2O 3: 3.80%, MgO: 3.58%, CaO: 1.59%, Cu: 0.31%.Reductive agent used is brown coal, and additive therefor is lime, and binding agent used is Xylo-Mucine (CMC).
By above-mentioned copper ashes, brown coal and lime are mixed in proportion levigate to 200 mesh screen residues 20%, mix binding agent and the water that accounts for whole material butt quality 9%, mix and with briquetting press, make diameter and highly be the small column briquetting of 20mm afterwards, at the bottom of being laid in kiln after oven dry, bed thickness is 30mm, the reduction temperature of the bed of material is 1350 ℃, recovery time is 40min, material piece after reduction is through cooling, broken, wet-milling, wet magnetic separation obtains the iron-copper micro mist that iron recovery is 98.37%, in products obtained therefrom, iron level is 92.27%, copper content is 0.78%, granularity is 5~70um, can be used as the raw material of Smelting Weathering Steel.Wet-milling adopts primary grinding, and ore milling concentration is 65%, grinding fineness 200 mesh screen residues 2%; The wet magnetic separation magneticstrength is 60.8KA/m.The tailings of wet-milling wet magnetic separation can be used as the raw material of clinker brick with central, and in copper ashes, the remaining valuable metal elements such as Pb, Zn are easy to volatilization due to the strong reducing environment of high temperature, can collect step by step, reclaim at the flue cooling section.
Embodiment 3
The batching of the present embodiment adopts the ratio of copper ashes, reductive agent, additive and binding agent to be, copper ashes: reductive agent: additive: binding agent=100:14:5.4:5.The main chemical compositions of copper ashes used is: TFe 41.15%, SiO 234.85%, Al 2O 33.80%, MgO 3.58%, and CaO 1.59%, and Cu 0.31%.Reductive agent used is coke powder, and additive therefor is lime, and binding agent used is Xylo-Mucine (CMC).
By above-mentioned copper ashes, coke powder and lime are mixed in proportion levigate to 200 mesh screen residues 20%, mix binding agent and the water that accounts for whole material butt quality 10%, mix and with briquetting press, make diameter and highly be the small column briquetting of 20mm afterwards, at the bottom of being laid in kiln after oven dry, bed thickness is 30mm, the reduction temperature of the bed of material is 1350 ℃, recovery time is 20min, material piece after reduction is through cooling, broken, wet-milling, wet magnetic separation obtains the iron-copper micro mist that iron recovery is 90.72%, in products obtained therefrom, iron level is 91.95%, copper content is 0.85%, granularity is 6 ~ 85um, can be used as the raw material of Smelting Weathering Steel.Wet-milling adopts primary grinding, and ore milling concentration is 65%, and grinding fineness is 200 mesh screen residues 2%; The wet magnetic separation magneticstrength is 60.8KA/m.The tailings of wet-milling wet magnetic separation can be used as the raw material of clinker brick with central, and in copper ashes, the remaining valuable metal elements such as Pb, Zn are easy to volatilization due to the strong reducing environment of high temperature, can collect step by step, reclaim at the flue cooling section.
Embodiment 4
The batching of the present embodiment adopts the ratio of copper ashes, reductive agent, additive and binding agent to be, copper ashes: reductive agent: additive: binding agent=100:20:6:5.The main chemical compositions of copper ashes used is: TFe 41.15%, SiO 234.85%, Al 2O 33.80%, MgO 3.58%, and CaO 1.59%, and Cu 0.31%.Reductive agent used is coke powder, and additive therefor is lime, and binding agent used is Xylo-Mucine (CMC).
By above-mentioned copper smelting slag, coke powder and lime are mixed in proportion levigate to 200 mesh screen residues 20%, mix binding agent and the water that accounts for whole material butt quality 8%, mix and with briquetting press, make diameter and highly be the small column briquetting of 20mm afterwards, at the bottom of being laid in kiln after oven dry, bed thickness is 30mm, the reduction temperature of the bed of material is 1350 ℃, recovery time is 30min, material piece after reduction is through cooling, broken, wet-milling, wet magnetic separation obtains the iron-copper micro mist that iron recovery is 91.08%, in products obtained therefrom, iron level is 91.64%, copper content is 0.81%, granularity is 7~90um, can be used as the raw material of Smelting Weathering Steel.Wet-milling adopts primary grinding, and ore milling concentration is 65%, grinding fineness 200 mesh screen residues 2%; The wet magnetic separation magneticstrength is 60.8KA/m.The tailings of wet-milling wet magnetic separation can be used as the raw material of clinker brick with central, and in copper ashes, the remaining valuable metal elements such as Pb, Zn are easy to volatilization due to the strong reducing environment of high temperature, can collect step by step, reclaim at the flue cooling section.

Claims (1)

1. the method that in a reducing atmosphere kiln, the fast restore copper ashes is produced iron-copper, it is characterized in that: by copper smelting slag, reductive agent and additive are mixed in proportion broken or levigate to 200 mesh screen residues 20%~40%, mix binding agent and the water that accounts for whole material butt quality 5%~20%, mix and with ball press or briquetting press, make bead or the diameter of diameter 15mm~30mm and highly be the small column briquetting of 15mm~30mm afterwards, at the bottom of being laid in kiln after oven dry, copper smelting slag, reductive agent, the mass ratio of additive and binding agent is, copper smelting slag: reductive agent: additive: binding agent=100:12~28:5~10:1~5, bed thickness is 20mm~45mm, the reduction temperature of the bed of material is 1250 ℃~1450 ℃, recovery time is 10~40min, pellet after reduction or material piece obtain through cooling, broken, wet-milling, wet magnetic separation the iron-copper micro mist that iron recovery is 85%~99%, in products obtained therefrom, iron level is 88%~98%, copper content is 0.25%~0.95%, and granularity is 3~100um,
The main chemical compositions of described copper smelting slag is: TFe30%~50%, SiO 230%~45%, Al 2O 33%~8%, MgO3%~5%, CaO1%~5%, Cu0.1%~1.2%, other are 0.1%~3% years old; Described reductive agent is a kind of in coke powder, brown coal, bituminous coal, hard coal or combination that certain is several; Described additive is a kind of in Wingdale, lime, sodium carbonate, fluorite, industrial soda or combination that certain is several; Described binding agent is a kind of in clay, water glass, red mud, mud, organic binder bond or combination that certain is several;
In order to make both to have kept than strongly reducing atmosphere in kiln, can make in kiln again to reach fast deep and reduce the required high temperature of 1250 ℃~1450 ℃, fuel gas and air or oxygen or oxygen-rich air all need to carry out the high temperature preheating processing; Fuel used gas is Sweet natural gas or coal-seam gas or petroleum gas or shale gas or coal gas; The pre-thermal recovery tubular heat exchanger of fuel gas and the high-temp waste gas that the drastic reduction kiln is discharged advance heat exchange, the temperature of the fuel gas after preheating is 300 ℃~500 ℃, the pre-thermal recovery hotblast stove of air or oxygen or oxygen-rich air, the strong reducing property waste gas that hotblast stove adds the discharge of thermal recovery drastic reduction kiln acts as a fuel, air or oxygen or oxygen-rich air are after the hotblast stove preheating, and temperature reaches 900 ℃~1300 ℃; By the preheating technique of above-mentioned fuel gas and air or oxygen or oxygen-rich air, realized high temperature and strong reducing environment in the drastic reduction stove like this, and will reduce by force physics heat energy and the chemical heat energy of waste gas and all recycle.
CN2012102106482A 2012-06-20 2012-06-20 Method for rapidly reducing copper slags to produce iron-copper alloys in kiln in reducing atmosphere CN102719676B (en)

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