CN103276294B - Method for rapidly reducing nickel slag to produce iron-nickel-copper alloy powder in kiln under reducing atmosphere - Google Patents

Method for rapidly reducing nickel slag to produce iron-nickel-copper alloy powder in kiln under reducing atmosphere Download PDF

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CN103276294B
CN103276294B CN201310170360.1A CN201310170360A CN103276294B CN 103276294 B CN103276294 B CN 103276294B CN 201310170360 A CN201310170360 A CN 201310170360A CN 103276294 B CN103276294 B CN 103276294B
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nickel
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CN103276294A (en
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倪文
王爽
李克庆
张玉燕
王红玉
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University of Science and Technology Beijing USTB
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Abstract

The invention relates to a method for rapidly reducing nickel waste slag to produce iron-nickel-copper alloy powder in a kiln under the reducing atmosphere. The method is characterized by comprising the following steps of: proportionally mixing the nickel waste slag, 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, and uniformly mixing; preparing small balls with the diameter of 15-33 mm or small cylinders with the diameter and the height of 15-30 mm by using a ball press machine or a section making machine; drying; flatly paving the materials at the bottom of the kiln, wherein the thickness of the material layer is 20-45 mm, the reducing temperature of the material layer is 1,250-1,450 DEG C, and the reducing time is 10-40 minutes; and performing cooling, crushing, wet grinding and wet magnetic separation on the reduced balls or sections to obtain iron-nickel-copper alloy micropowder with the iron recovery rate of 85-99 %, wherein in the obtained product, the iron content is 88-98 %, the nickel content is 0.13-1.98 %, the copper content is 0.14-1.29 % and the particle size is 3-100 microns, and the product can serve as a raw material for smelting weather-resistant steel. The tailings after wet grinding and wet magnetic separation can serve as raw materials for extracting aedelforsite or producing hollow sintered bricks.

Description

A kind of reducing atmosphere kiln fast restore nickel slag produces the method for iron corronel powder
Technical background
The present invention relates to comprehensive utilization of resources field, provide a kind of method of fast restore nickel waste production iron corronel powder in reducing atmosphere kiln.
China produces nickel waste about 2,000,000 tons at present per year, about has 4600 tons of metallic nickels every year, 3200 tons of metallic coppers are wasted in national nickel waste.Except residual metal nickel, copper etc. have except higher value in nickel waste, also often contain the iron of 30% ~ 50%, iron in nickel waste 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 nickel waste of current China generally sells the batching of cement mill as calcining cement clinker, allocates per-cent into generally 3% ~ 5%, west area due to cement production enterprise less, the nickel waste of a large amount of output cannot be consumed.Therefore nickel waste is in the state of storing up substantially.Whole nation nickel waste is stored up and is reached 4,000 ten thousand tons, if rolled over synthetic metals, has then accumulated and has thrown aside the ferrous metal having stored up about 1,600 ten thousand tons, the copper metal of 6.4 ten thousand tons and the nickel metal of 9.2 ten thousand tons.The actual boundary grade of the current iron ore exploitation of China is 10% ~ 30%, and the iron level in nickel waste is far away higher than the actual boundary grade of China's iron ore exploitation.But because the iron in nickel waste mainly exists with the form of ferric metasilicate, and cause traditional ore-dressing technique iron wherein cannot be carried out effective enrichment.Therefore be no matter be sold to cement mill to abandon disposal as the batching of calcining cement clinker or heap, all cause the huge waste of nickel resources in this slag, copper resource and iron resources.
Object of the present invention is exactly remaining nickel wherein, copper and a large amount of iron resources are extracted with the form of iron corronel micro mist, 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 ore.
Publication number is that the patent of CN101161830A describes 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 producing qualified roasting ore deposit ball product; breeze is made to be used for smelting iron and steel; make full use of and save natural resources, available protecting environment also saves 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 the data of the reduction ratio of iron in the ball of ore deposit after roasting, abrasive grit size and washability.
Publication number is a kind of method that the patent of CN101063181A describes that rotary hearth furnace rapid reduction of carbonaceous auriferous pyrite burns 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 high, cost is low, easily the feature such as automatic control.But the mainly ferric oxide of the iron in the material involved by this technology, does not provide the method controlling ferric metasilicate reduction.This technology does not provide the effective ways how strong reduction rotary hearth furnace tail gas processes yet, and is difficult to industrializing implementation under advocating the situation of energy-saving and emission-reduction in existing country.In addition, three embodiments given in this technology are all the process about magnesia red soil nickel ore, and describe inconsistent in invention book, cannot implement.
Publication number is that the patent of CN101413057A describes a kind of low-grade and Complex Iron Ore method for efficiently separating, the Complex Iron Ore stone classification of different grade 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 adopts chain mat machine-shaft furnace process, and carry out weak reduction at 900 DEG C ~ 1000 DEG C, the raw material adopted also is only low-grade iron ore of main ferrous mineral with ferric oxide, do not relate to the technology controlling 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
The present invention seeks to the core technology difficult problem mainly solving two aspects: one is create the high temperature strongly reducing atmosphere of 1250 DEG C ~ 1450 DEG C in kiln, utilize high temperature to reduce by force the physics heat energy of tail gas and chemical heat energy simultaneously; Two is the reaction process controlling material, at lime, by the Fe in ferric metasilicate under the effect of the additives such as sodium carbonate 2+cement out, more than 99% is reduced into metallic iron, control metallic nickel, copper enter metallic iron, form iron corronel micro mist, follow-up wet-milling, wet method low intensity magnetic separation control iron corronel micro mist size at 3 ~ 100um, so that can select Iron grade and the iron corronel micro mist of the rate of recovery all more than 90% simultaneously.
The method of a kind of fast deep reduced nickel waste production iron corronel micro mist in reducing atmosphere kiln proposed by the invention, is made up of four parts such as Kiln Control, batching, pelletizing or the section of making, drastic reduction roasting and broken wet-milling-wet magnetic separations.
In order to control the strongly reducing atmosphere of kiln inside, kiln burning time air or oxygen or oxygen-rich air supply by supply complete combustion of fuel time required whole air or oxygen or oxygen-rich air 40% ~ 60%.Air or oxygen required for above-mentioned perfect combustion or oxygen-rich air amount refer to and the various carbon compounds 100% in fuel are transformed into CO 2required theoretical amount.
In order to make both to have kept comparatively strongly reducing atmosphere in kiln, can make again to reach in kiln the high temperature of 1250 DEG C ~ 1450 DEG C needed for fast deep reduction, fuel gas and air or oxygen or oxygen-rich air all need to carry out high temperature preheating process.Fuel used gas is natural gas or coal-seam gas or petroleum gas or shale gas or coal gas.The high-temp waste gas that the preheating of fuel gas adopts tubular heat exchanger and drastic reduction kiln to discharge enters heat exchange, and the temperature of the fuel gas after preheating is 300 DEG C ~ 500 DEG C.The preheating of air or oxygen or oxygen-rich air adopts regenerative high temperature combustion technology technology or hotblast stove, and the strong reducing property waste gas that hotblast stove heating adopts drastic reduction kiln to discharge is as fuel.Air or oxygen or oxygen-rich air are after regenerative high temperature combustion technology technology or hotblast stove preheating, and temperature reaches 900 DEG C ~ 1300 DEG C.Like this by the preheating technique of above-mentioned fuel gas and air or oxygen or oxygen-rich air, achieve the high temperature in drastic reduction stove and strong reducing environment, and all recycle reducing by force the physics heat energy of waste gas and chemical heat energy, eliminate CO, CH in discharging waste gas 4deng to air, there is the strong unwanted component polluted.
The ratio of batching employing nickel waste, reductive agent, additive and binding agent in the present invention is, nickel waste: reductive agent: additive: binding agent=100:12 ~ 28:5 ~ 10:1 ~ 5.
The main chemical compositions mass percent of described nickel waste is: TFe:35% ~ 45%, SiO 2: 30% ~ 40%, Al 2o 3: 2% ~ 7%, MgO:1% ~ 10%, CaO:1% ~ 5%, Ni:0.1% ~ 0.8%, Cu:0.1% ~ 1.2%, other: 0.1% ~ 3%.(note: full iron TFe refers to all iron existed in any form, the iron comprising free iron and combine with oxygen or other elements, all iron content 35% ~ 45% is converted into ferriferous oxide content and is expressed as 45% ~ 64%, can reach 100% with other Ingredient percent sums.) described reductive agent is a kind of or certain several combination in coke powder, brown coal, bituminous coal, hard coal.Described additive is a kind of or certain several combination in Wingdale, lime, sodium carbonate, fluorite, industrial soda.Described binding agent is a kind of or certain several combination in clay, water glass, red mud, mud, organic binder bond.
Above-mentioned nickel waste, reductive agent and additive are mixed in proportion broken or levigate to 200 mesh screen residues 20% ~ 40%, mix binding agent and the water accounting for whole material butt quality 5 ~ 20%, make the bead of diameter 15mm ~ 30mm or diameter with ball press or section machine processed after mixing and be highly the small column of 15mm ~ 30mm, be laid in after oven dry at the bottom of kiln, bed thickness is 20mm ~ 45mm, the reduction temperature of the bed of material is 1250 DEG C ~ 1450 DEG C, and the recovery time is 10 ~ 40min.Pellet after reduction or material section in, in initial material, the existing forms of various iron has 99.1% ~ 99.8% to be reduced into metallic iron, and in initial material, the existing forms of various nickel has 85.2% ~ 99.5% to be reduced into metallic nickel, and enters metallic iron particulate.In initial material, the existing forms of various copper has 88.3% ~ 99.5% to be reduced into metallic copper, and enters metallic iron particulate.Pellet after drastic reduction or material section obtain through cooling, fragmentation, wet-milling, wet magnetic separation the iron corronel micro mist that iron recovery is 85% ~ 99%, in products obtained therefrom, iron level is 88% ~ 98%, nickel content is 0.13% ~ 1.98%, copper content is 0.14% ~ 1.29%, 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 extracting wollastonite or produce clinker brick with central.
Beneficial effect of the present invention
1. the iron in the nickel waste traditional technique of preparing and existing reduction roasting magnetic separation technology cannot selected in a large amount of ferric metasilicate and remaining nickel, copper extract, and are transformed into the iron corronel micro mist with high added value;
2. reduce with existing other compared with kiln reducing roasting technique, while achieving the strong reducing environment of high temperature, also achieve high temperature and reduce by force the physics heat energy of waste gas and the recycling of chemical heat energy, avoid and discharge CO and CH in air 4etc. strong pollution gas, improve the utilising efficiency of the energy;
3., compared with sealing drastic reduction technology with existing oxidizing atmosphere kiln kiln furnitures, the recovery time shortens more than 10 times, is conducive to raising the efficiency, reduces costs;
4. achieve three kinds of main valuable metals---extraction and application while iron, nickel and copper in nickel waste, significant to the comprehensive utilization of nickel waste;
5., owing to the overwhelming majority of the metallic elements such as iron, nickel, copper being removed in the tailings of wet-milling wet magnetic separation, be conducive to the hollow sintering of tailings production environment friendly and turn.
Accompanying drawing explanation
Fig. 1 is the process flow sheet that reducing atmosphere kiln process nickel waste of the present invention produces iron corronel micro mist.
Embodiment
With reference to Fig. 1, implement the present invention according to process flow sheet of the present invention, comprising:
1. the raw material preparatory stage:
Nickel waste used, reductive agent (a kind of or certain several combination in coke powder, brown coal, bituminous coal, hard coal), additive (a kind of or certain several combination in Wingdale, lime, sodium carbonate, fluorite, industrial soda) 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: nickel waste, reductive agent, additive and binding agent.In the present invention, the proportioning of nickel waste, reductive agent, additive and binding agent is, nickel waste: reductive agent: additive: binding agent=100:12 ~ 28:5 ~ 10:1 ~ 5.
3. compounding process:
The raw material prepared in 2nd step is mixed fully, ensures that the material mixed is uniform;
4. pressure ball or compression leg operation
The material mixed is added the water accounting for whole material butt quality 5% ~ 20%, stir simultaneously, be pressed into the pelletizing of 15 ~ 30mm with ball press or make basal diameter with section machine processed and be highly the small column of 15 ~ 30mm, and drying treatment.
5. charging and reduction operation:
Insert reducing atmosphere kiln by after the pellet of compacting or material section drying, under certain reduction temperature, carry out drastic reduction roasting, bed of material uniform spreading at furnace bottom, period experience preheating, heating drastic reduction.Mixture mainly carries out drastic reduction in drastic reduction temperature band, and reduction temperature is 1250 DEG C ~ 1450 DEG C, and the recovery time is 10 ~ 40min, treats that temperature drops to less than 80 DEG C, is taken out by material from this reducing atmosphere kiln.Pellet after reduction or material section in, in initial material, the existing forms of various iron has 99% ~ 99.8% to be reduced into metallic iron.In initial material, the existing forms of various nickel has 90% ~ 99.8% to be reduced into metallic nickel, and enters metallic iron particulate.In initial material, the existing forms of various copper has 90% ~ 99.8% to be reduced into metallic copper, and enters metallic iron particulate.
6. fragmentation, wet-milling and wet magnetic separation operation
As shown in Figure 1, pellet after reduction or material section obtain through cooling, fragmentation, wet-milling, wet magnetic separation the iron corronel micro mist that iron recovery is 85% ~ 99%, in products obtained therefrom, iron level is 88% ~ 98%, nickel content is 0.13% ~ 1.98%, copper content is 0.14% ~ 1.29%, granularity is 3 ~ 100um, can be used as the raw material of Smelting Weathering Steel, and the tailings of wet-milling wet magnetic separation can be used as the raw material extracting wollastonite or produce clinker brick with central.
Embodiment 1
The present embodiment technical process by Kiln Control, prepare burden, the section of making, four parts such as drastic reduction roasting and broken wet-milling-wet magnetic separation form.
In order to control the strongly reducing atmosphere of kiln inside, during kiln burning amount of supplied air by supply complete combustion of fuel time required whole air 50%.Air required for above-mentioned perfect combustion refers to and the various carbon compounds 100% in fuel is transformed into CO 2required theoretical amount.
In order to make both to have kept comparatively strongly reducing atmosphere in kiln, can make again to reach the high temperature of 1350 DEG C needed for fast deep reduction in kiln, fuel gas and air all need to carry out high temperature preheating process.Fuel used gas is Sweet natural gas.The high-temp waste gas that the preheating of Sweet natural gas adopts tubular heat exchanger and drastic reduction kiln to discharge enters heat exchange, the temperature of the Sweet natural gas after preheating is 500 DEG C, preheating of air adopts regenerative high temperature combustion technology technology, and air is after the preheating of regenerative high temperature combustion technology technology, and temperature reaches 1200 DEG C.Like this by the preheating technique of above-mentioned fuel gas and air, achieve the high temperature in drastic reduction stove and strong reducing environment, and all recycle reducing by force the physics heat energy of waste gas and chemical heat energy, eliminate CO, CH in discharging waste gas 4deng to air, there is the strong unwanted component polluted.
The batching of the present embodiment adopts the ratio of nickel waste, reductive agent, additive and binding agent to be, nickel waste: reductive agent: additive: binding agent=100:20:5.4:5.The main chemical compositions of nickel waste used is: TFe41.31%, SiO 235.62%, Al 2o 32.43%, MgO8.74%, CaO3.29%, Ni0.22%, Cu0.19%, other is 2.9% years old.Reductive agent used is brown coal, and additive therefor is lime, and binding agent used is Xylo-Mucine (CMC).
By above-mentioned nickel waste, brown coal and lime are mixed in proportion levigate to 200 mesh screen residues 20%, mix binding agent and the water accounting for whole material butt quality 10%, make diameter with section machine processed after mixing and be highly the small column of 20mm, be laid in after oven dry at the bottom of kiln, bed thickness is 30mm, the reduction temperature of the bed of material is 1450 DEG C, recovery time is 10min, material section after reduction is through cooling, broken, wet-milling, wet magnetic separation obtains the iron corronel micro mist that iron recovery is 94.65%, in products obtained therefrom, iron level is 91.38%, , nickel content is 0.42%, copper content is 0.26%, 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%, ore grinding time 20min; Wet magnetic separation magneticstrength is 60.8KA/m.The tailings of wet-milling wet magnetic separation can be used as the raw material extracting wollastonite or produce clinker brick with central.
Embodiment 2
The main chemical compositions of nickel waste used is: TFe40.21%, SiO 234.61%, Al 2o 32.26%, MgO8.86%, CaO3.37%, Ni0.23%, Cu0.16%, other is 2.6% years old.Reductive agent used is brown coal, and additive therefor is lime, and binding agent used is Xylo-Mucine (CMC).By above-mentioned nickel waste, brown coal and lime are mixed in proportion levigate to 200 mesh screen residues 20%, mix binding agent and the water accounting for whole material butt quality 9%, make diameter with section machine processed after mixing and be highly the small column of 20mm, be laid in after oven dry at the bottom of kiln, bed thickness is 30mm, the reduction temperature of the bed of material is 1350 DEG C, recovery time is 40min, material section after reduction is through cooling, broken, wet-milling, a wet magnetic separation obtains the iron corronel micro mist that iron recovery is 97.51%, in products obtained therefrom, iron level is 91.97%, nickel content is 0.47%, copper content is 0.28%, 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%, ore grinding time 20min; Wet magnetic separation magneticstrength is 60.8KA/m.The tailings of wet-milling wet magnetic separation can be used as the raw material extracting wollastonite or clinker brick with central.
Embodiment 3
The batching of the present embodiment adopts the ratio of nickel waste, reductive agent, additive and binding agent to be, nickel waste: reductive agent: additive: binding agent=100:14:5.4:5.The main chemical compositions of nickel waste used is: TFe42.31%, SiO 235.60%, Al 2o 32.37%, MgO5.77%, CaO3.26%, Ni0.22%, Cu0.16%, other is 2.55% years old.Reductive agent used is coke powder, and additive therefor is lime, and binding agent used is Xylo-Mucine (CMC).
By above-mentioned nickel waste, coke powder and lime are mixed in proportion levigate to 200 mesh screen residues 20%, mix binding agent and the water accounting for whole material butt quality 10%, make diameter with section machine processed after mixing and be highly the small column of 20mm, be laid in after oven dry at the bottom of kiln, bed thickness is 30mm, the reduction temperature of the bed of material is 1350 DEG C, recovery time is 20min, material section after reduction is through cooling, broken, wet-milling, wet magnetic separation obtains the iron corronel micro mist that iron recovery is 90.61%, in products obtained therefrom, iron level is 91.74%, nickel content is 0.45%, copper content is 0.35%, 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%, ore grinding time 20min; Wet magnetic separation magneticstrength is 60.8KA/m.The tailings of wet-milling wet magnetic separation can be used as the raw material extracting wollastonite or produce clinker brick with central.
Embodiment 4
The batching of the present embodiment adopts the ratio of nickel waste, reductive agent, additive and binding agent to be, nickel waste: reductive agent: additive: binding agent=100:20:6:5.The main chemical compositions of nickel waste used is: TFe40.52%, SiO 231.64%, Al 2o 33.76%, MgO3.62%, CaO2.73%, Ni0.21%, Cu0.18%, other is 2.06% years old.Reductive agent used is coke powder, and additive therefor is lime, and binding agent used is Xylo-Mucine (CMC).
By above-mentioned nickel waste, coke powder and lime are mixed in proportion levigate to 200 mesh screen residues 20%, mix binding agent and the water accounting for whole material butt quality 8%, make diameter with section machine processed after mixing and be highly the small column of 20mm, be laid in after oven dry at the bottom of kiln, bed thickness is 30mm, the reduction temperature of the bed of material is 1350 DEG C, recovery time is 30min, material section after reduction is through cooling, broken, wet-milling, wet magnetic separation obtains the iron corronel micro mist that iron recovery is 92.01%, in products obtained therefrom, iron level is 92.11%, nickel content is 0.41%, copper content is 0.31%, 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%, ore grinding time 20min; Wet magnetic separation magneticstrength is 60.8KA/m.The tailings of wet-milling wet magnetic separation can be used as the raw material extracting wollastonite or produce clinker brick with central.

Claims (3)

1. in a reducing atmosphere kiln, fast deep reduced nickel waste produces the method for iron corronel micro mist, it is characterized in that: nickel waste, reductive agent and additive are mixed in proportion broken or levigate to 200 mesh screen residues 20% ~ 40%, mix binding agent and the water accounting for whole material butt quality 5% ~ 20%, the ratio of nickel waste, reductive agent, additive and binding agent is, nickel waste: reductive agent: additive: binding agent=100:12 ~ 28:5 ~ 10:1 ~ 5, make the bead of diameter 15mm ~ 30mm or diameter with ball press or section machine processed after being mixed and be highly the small column of 15mm ~ 30mm, be laid in after oven dry at the bottom of kiln, bed thickness is 20mm ~ 45mm, the reduction temperature of the bed of material is 1250 DEG C ~ 1450 DEG C, recovery time is 10 ~ 40min, pellet after drastic reduction or material section are through cooling, broken, wet-milling, wet magnetic separation obtains the iron corronel micro mist that iron recovery is 85% ~ 99%, in products obtained therefrom, iron level is 88% ~ 98%, nickel content is 0.13% ~ 1.98%, copper content is 0.14% ~ 1.29%, 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 extracting wollastonite or produce clinker brick with central.
2. in a kind of reducing atmosphere kiln according to claim 1, fast deep reduced nickel waste produces the method for iron corronel micro mist, it is characterized in that the main chemical compositions of described nickel waste is: TFe:35% ~ 45%, SiO 2: 30% ~ 40%, Al 2o 3: 2% ~ 7%, MgO:1% ~ 10%, CaO:1% ~ 5%, Ni:0.1% ~ 0.8%, Cu:0.1% ~ 1.2%, other: 0.1% ~ 3%; Described reductive agent is a kind of or certain several combination in coke powder, brown coal, bituminous coal, hard coal; Described additive is a kind of or certain several combination in Wingdale, lime, sodium carbonate, fluorite, industrial soda; Described binding agent is a kind of or certain several combination in clay, water glass, red mud, mud, organic binder bond.
3. in a kind of reducing atmosphere kiln according to claim 1, fast deep reduced nickel waste produces the method for iron corronel micro mist, it is characterized in that, fuel used gas is Sweet natural gas or coal-seam gas or petroleum gas or shale gas or coal gas; The high-temp waste gas that the preheating of fuel gas adopts tubular heat exchanger and drastic reduction kiln to discharge enters heat exchange, the temperature of the fuel gas after preheating is 300 DEG C ~ 500 DEG C, the preheating of air or oxygen or oxygen-rich air adopts regenerative high temperature combustion technology technology or hotblast stove, the strong reducing property waste gas that hotblast stove heating adopts drastic reduction kiln to discharge is as fuel, air or oxygen or oxygen-rich air are after regenerative high temperature combustion technology technology or hotblast stove preheating, and temperature reaches 900 DEG C ~ 1300 DEG C.
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