CN108004396B - It is a kind of to produce acidic oxidation pellet method using nickel slag - Google Patents
It is a kind of to produce acidic oxidation pellet method using nickel slag Download PDFInfo
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- CN108004396B CN108004396B CN201711218454.6A CN201711218454A CN108004396B CN 108004396 B CN108004396 B CN 108004396B CN 201711218454 A CN201711218454 A CN 201711218454A CN 108004396 B CN108004396 B CN 108004396B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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Abstract
Acidic oxidation pellet technique is produced using nickel slag the present invention relates to a kind of, it is not high for iron content in nickel slag, silicone content is higher, make the status that it is not utilized effectively, for development and utilization nickel slag and high silicon iron concentrate, the production technology of use are as follows: after aqueous lower nickel slag is using ore mill dry grinding, nickel ground-slag and high silicon iron concentrate, bentonite carries out ingredient and mixing, mixed material is added in shaft furnace after profit mill and pelletizing, pelletizing passes through drying in furnace, preheating, the processes such as oxidizing roasting and cooling, FeO content in pellet can be made to be down to 1% or less, TFe content reaches 50% or more, pellet strength reaches 2000N/ or more.The pellet that the present invention is produced using nickel slag and high silicon iron concentrate is after shaft furnace oxidizing roasting, the acidic pellet ore of production is being utilized with being added in blast furnace after Sintering Blend, nickel slag is not only set to be utilized effectively, and reduce the accumulation land occupation and environmental pollution of nickel slag, while creating certain economic benefit for enterprise.
Description
Technical field
The invention belongs to metallurgy and mineral engineering technology fields, are related to a kind of utilization nickel slag production acidic oxidation pelletizing miner
Skill.
Background technique
The slag emission amount that China's non-ferrous metal industry is smelted is huge, more containing metallic element in slag.The iron product of nickel slag
Position is not high, but SiO2Content is very high, is not able to satisfy the needs of blast furnace ironmaking production.If so many nickel slag is not added improvement and appoints
It is stacked, and can not only occupy a large amount of soil, but also will cause environmental pollution.
The shape of the dry slag of nickel slag is rectangle mostly or diamond shape, and granularity is about 10~100mm bulk；Nickel pulp water slag shape is
Black ball shape, granularity are about 0~5mm, and quality is hard and has glassy lustre.Nickel slag main chemical compositions are as follows: TFe 42%,
SiO2For 32.8%, Ni 0.21%, Cu 0.24%, Co 0.09%.
Nickel slag is formed in high-temperature electric resistance furnace during nickel fibers, and main component is FeO, while also containing micro
Valuable metal.Iron and silica generate ferrosilite in high temperature slag, and iron mainly exists in the form of pyroxene and olivine, deposits
It is mainly Fe in form2SiO4、2FeO·SiO2It is difficult to crystallize when Deng, condensation, often at vitreum, softening temperature is low.Water quenching nickel slag
In be primarily present 3 kinds of tissues: be 1. in the form of a column the iron forsterite (Fe, Mg) of distribution2SiO4Crystalline phase and fayalite Fe2SiO4
Crystalline phase；2. irregular Si oxide fills phase between crystalline phase；3. the shape that is scattered about like the stars is distributed in the copper between above-mentioned 2 kinds of tissues
Ferronickel sulfide.
Nickel slag has micromagnetism, but it is difficult with magnetic separation mode to improve ferrous grade.To be comprehensively utilized nickel slag, state
The main method of inside and outside use has: (1) changing mineral phase structure, warp with addition of sintering for agglumeration after quick lime, carbon dust mixing in nickel slag
It is levigate to cross ball milling, floatingly selects Iron Ore Powder, again sintering for agglumeration, enters furnace smelting.(2) it is smelted by electric furnace heating, converter blowing, it is real
The separation of existing scum, can produce the structural steel of atmospheric corrosion resistance.(3) nickel slag is processed into qualified block, directly enters furnace instead of iron ore
Stone, and with carry out blast furnace process after other feed proportionings.(4) sinter, sinter people again are produced with addition of nickel slag in iron ore concentrate
Furnace is smelted.Above 4 kinds of methods the problem is that production iron concentrate grade is low, high production cost, limit the exploitation benefit of nickel slag
With.
Currently, domestic high silicon refractory iron ore stock number is larger, the ore grinding and magnetic separation process of this ore mining routine, although
The higher Iron concentrate of grade can be obtained, but due to SiO in Iron concentrate2Content is higher, is directly added into blast furnace and carries out using can make height
Furnace generates the biggish quantity of slag and higher coke ratio, while bringing certain difficulty to the smelting of blast furnace.But when high silicon concentrate passes through
When direct-reduction technique is handled, higher cost, the resource utilization for producing metallic iron are lower.High silicon iron concentrate primary chemical
Ingredient are as follows: TFe 62.27%, FeO 22.87%, Fe2O3For 63.59%, SiO2It is 7.98%.
Currently, the burden structure that Iron and Steel Enterprises in China blast furnace ironmaking uses is high basicity sinter with addition of a small amount of acid furnace
Material.Acid burden material mainly includes pellet, lump ore and acid sinter ore etc..The intensity of high basicity sinter is high, Well-recovered；Acid
Property pellet shape is uniformly regular, and powder is few, grade is high, intensity is high, FeO content is low, there is good reproducibility.From technical standpoint
From the point of view of, the burden structure that the two is collocated with each other belongs to optimal burden structure, and wherein acidic pellet ore usage ratio is in 20-30%.
Pellet is a kind of method of artificial block stock, be-a granular material is become into physical property phase chemical composition
It can satisfy down-walk the process of processing request.In pellet production, material is not only due to rolling balling and particle is intensively sent out
Raw physical change is more importantly chemically and physically changed, and the metallurgical performance of material is improved.In pellet
FeO content is low (generally 1% or so), and mineral are mainly Fe2O3, Well-recovered, cold strength is good, and each pelletizing compression strength is
2800-3600N, epigranular.
In oxide pellet production, shaft furnace is a kind of stove of agglomerates mine.Drying bed, roasting are equipped at the top of shaft furnace
It burns room center and is equipped with air-guiding wall, the high-temperature flue gas generated in combustion chamber sprays into firing chamber from shaft furnace two sides and flows to top.It is raw
Ball is equably laid on drying bed at the top of shaft furnace and is raised hot gas drying, preheating, then slides into along drying bed slope
Baking and concretion in firing chamber.Pelletizing behind firing chamber out with from bottom drum into cold wind gas carry out counterflow heat exchange, pellet can be made
120 DEG C are cooled to hereinafter, shaft furnace finally is discharged with ore discharge machine.The structure of shaft furnace is simple, to material without particular/special requirement, the disadvantage is that single
Furnace output is low, is only applicable to magnetic fine powder pellet roasting.
The main iron mineral of acidic pellet ore is bloodstone.Pellet feed is in high-temperature calcination process through recrystallization, crystal grain
It grows up to form bloodstone crystal stock, makes pellet that there is very high intensity.When gangue mineral is quartz, as long as magnetic iron ore (Fe3O4)
Oxidation sufficiently, forms bloodstone (Fe2O3), quartz is not reacted with bloodstone, still it is present in pellet in the form of independent, therefore
The intensity of pellet is not influenced.If magnetic iron ore oxidation is not enough, it can be in high-temperature roasting band and quartz (SiO2) reaction,
Form ferrosilite (2FeOSiO2) liquid phase, it is covered in magnetite ore particles surface, hinders the diffusion of oxygen, magnetic iron ore is influenced and continues oxygen
Change, thus form not oxidized magnetic iron ore core inside pellet, liquid phase solidifies in cooling procedure after baking in addition
And volume contraction, make to generate concentric annular crackle inside pellet, to keep the reproducibility of pellet and intensity all impacted.
The present invention is on the basis of existing iron ore shaft furnace oxidizing roasting technique, to pass through shaft furnace production blast furnace using nickel slag
The acidic oxidation pellet used, accumulation and problem of environmental pollution caused by solving nickel slag due to can not utilize, proposes one kind
Acidic oxidation pellet technique is produced using nickel slag.
Summary of the invention
The technical problem to be solved by the present invention is in the prior art the shortcomings that and provide it is a kind of using nickel slag produce
Acidic oxidation pellet method.
Technical problem to solve of the invention adopts the following technical scheme that
It is a kind of to produce acidic oxidation pellet method using nickel slag, the specific process is as follows:
(1) after the nickel slag by moisture content mass content less than 6% is dry grinded using dry milling machine, obtaining granularity is -200
Mesh accounts for the nickel ground-slag of mass fraction 55-70%；
(2) by step (1) dry grinding after nickel ground-slag, high silicon iron concentrate and distension profit soil 100:90-95:2-4 in mass ratio into
After row ingredient and mixing, it is added after the 5-6% moisture content of mixed material quality and 4-5min profit is carried out to mixed material using damp mill
Mill, makes -200 mesh in mixed material granularity account for mass fraction 80-85%；
(3) by the profit grind materials of step (2) use disk or pelletising drum pelletizing, be made quality it is aqueous for 10-12%,
Granularity is the green-ball of 8-16mm；
(4) by the green-ball of step (3) by swing material distributing machine along the uniform cloth of vertical furnace wide direction to shaft furnace furnace roof drying bed
After roast, shaft roasting is divided into dry zone, preheating zone, roasting band and cooling zone from top to bottom, and roasting makes pellet strength 2000N/
It is more than a ball, FeO content enter shaft furnace cooling zone after being down to 5-7%, further aoxidized by air, drop FeO content
It is discharged to obtain acidic oxidation pellet from shaft furnace bottom hereinafter, being cooled to 120 DEG C or less to 1%.
The Iron grade of nickel slag is 40-45%, and the Iron grade of high silicon iron concentrate is 60-62%.
Green-ball controls 300-600 DEG C of maturing temperature, calcining time 10-12min in shaft furnace dry zone in step (4)；Preheating
Band control 600-1000 DEG C of maturing temperature, calcining time 15-20min；1250-1300 DEG C of maturing temperature of roasting band control, roasting
Time 30-35min；Cooling zone controls 45-50min cooling time.
High silicon iron concentrate uses the drum drier with combustion chamber, using coal dust or coal gas as fuel, controls gas inlet temperature
700-800 DEG C of degree, makes 7.0% or less high silicon iron concentrate moisture content mass content by 120-200 DEG C of flue gas exit temperature.
Material after step (2) profit mill is sifted out into the unqualified green-ball returning charge of -8mm and+16mm after crushing again using circle
Disk or pelletising drum pelletizing.
The present invention is to utilize supplying high silicon iron concentrate production acidic oxidation pellet, technological principle are as follows: nickel in nickel slag
SiO in slag2Content is 32-35%, SiO in high silicon iron concentrate2Content 7-18%, SiO in both ferrous materials2Content is higher, when
When being utilized as sintering deposit raw material, need to be added larger proportion lime stone carry out basicity adjustment, cause grade of sinter compared with
It is low；When nickel slag and high silicon iron concentrate are utilized as acid material, can be made full use of when being added without lime stone
The SiO of ferriferous oxide therein and acidity2, produce acidic pellet ore；The Iron grade of nickel slag is 40-45% simultaneously, cannot directly be made
It is utilized for the raw material of blast furnace ironmaking.The Iron grade of high silicon iron concentrate is 60-62%, by being incorporated high-grade in nickel ground-slag
High silicon iron concentrate, the acidic oxidation pelletizing that mixed material can be made to produce meets the requirement of blast furnace feeding raw material grade.
Advantages of the present invention are as follows: 1, by nickel slag be incorporated high silicon iron concentrate, using mixed material produce acidic oxidation
Pellet can be such that nickel slag and high silicon iron concentrate is efficiently utilized.2, nickel slag is used among acidic pellet ore feed proportioning, no
The accumulation and environmental pollution of nickel slag are only reduced, and the solid waste utilization of nickel slag can create certain economic benefit.3, the present invention is raw
When the acidic oxidation pellet of production is used for blast furnace ironmaking, because its slag iron is than low, fuel ratio is low, be conducive to the energy-saving and emission-reduction of blast furnace.
4, the simple production process of acidic oxidation pellet can eliminate a large amount of material storage yard, ingredient and mixing equipment, be conducive to drop
Low ironmaking cost.5, in acidic oxidation pellet produced by the invention FeO content be down to 1% or less, TFe content reach 55% with
Upper, pellet strength reaches 2000N/ or more.
Produce acidic oxidation pellet method using nickel slag the present invention relates to a kind of, be it is not high for iron content in nickel slag,
Silicone content is higher, the status for making it not be utilized effectively, for development and utilization nickel slag and high silicon iron concentrate, the production work of use
Skill are as follows: after aqueous lower nickel slag is using ore mill dry grinding, nickel ground-slag carries out ingredient with high silicon iron concentrate, bentonite and mixes,
Mixed material is added in shaft furnace after profit mill and pelletizing, and pelletizing waited in furnace by dry, preheating, oxidizing roasting and cooling
Journey, can make in pellet FeO content be down to 1% or less, TFe content reach 50% or more, pellet strength reach 2000N/ with
On.The acidic pellet ore of production is being utilized with being added in blast furnace after Sintering Blend, and nickel slag is not only made to obtain effective benefit
With, and reduce the accumulation land occupation and environmental pollution of nickel slag, while creating certain economic benefit for enterprise.
Detailed description of the invention
Fig. 1 produces acidic oxidation pellet process flow chart using nickel slag to be a kind of.
Specific embodiment
Embodiment 1
It is a kind of to produce acidic oxidation pellet method using nickel slag, the specific process is as follows:
1, the selection of material
Nickel slag selects grain slag, and shape is black ball shape, and granularity is -5mm, and chemical analysis is as shown in table 1.
1 nickel pulp water dreg chemistry composition of table
High silicon iron granularity of concentrate selects -200 mesh to account for mass fraction 55%, and chemical analysis is as shown in table 2.
2 high silicon iron concentrate chemical analysis of table
2, after the nickel slag by water content less than 6% is dry grinded using dry milling machine, obtaining granularity is that -200 mesh account for matter
Measure the nickel ground-slag of score 55%.
3, when water content is higher than 7.0% in high silicon iron concentrate, using the drum drier with combustion chamber, it is with coal dust
Fuel, control 700 DEG C of gas inlet temperature, 120 DEG C of flue gas exit temperature, make high silicon iron concentrate water content be down to 7.0% with
Under.
4, it after nickel ground-slag, high silicon iron concentrate being carried out ingredient and mixed with distension profit soil by the mass ratio of 100:95:2, is added
4min profit mill is carried out to mixed material using damp mill after 6% moisture content of mixed material quality, makes -200 mesh in mixed material granularity
Account for mass fraction 85%.
5, profit grind materials use disc balling machine, and the green-ball that water content is 12%, granularity is 16mm is made.
6, moisten in grind materials balling process, sift out the unqualified green-ball of -8mm and+16mm.Unqualified green-ball returning charge is after crushing
Again pelletizing.
7, qualified green-ball is by swing material distributing machine along furnace wide direction uniform cloth to furnace roof drying bed.
8, in shaft furnace, green-ball removes mechanical water and the crystallization water in dry zone, carries out pelletizing heating and preliminary in preheating zone
Oxidation carries out the reaction such as iron oxide oxidation, decomposition of limestone and desulfuration in roasting band.Pelletizing passes through high-temperature roasting in shaft furnace,
Segment magnet mine is being oxidized to Fe203, most of bloodstone at high temperature gradually grow up and recrystallized and formed crystalline substance by crystal grain
Bridge.Meanwhile the low-melting compound generated at high temperature makes pelletizing structure finer and close, pellet strength be up to 2000N/ ball with
On, FeO content is down to 5%；Pellet after high-temperature roasting enters shaft furnace cooling zone, is further aoxidized by air, can make pelletizing
Middle FeO content is down to 1% or less.After high temperature pelletizing and normal temperature air carry out heat exchange, it is preheating to 1100 DEG C or more of high temperature air
It is combustion-supporting to enter the progress of shaft roasting band, and oxide pellet is cooled to 120 DEG C or less and is discharged from shaft furnace bottom.Pellet-roasting
Shaft furnace is divided into dry zone, preheating zone, roasting band and cooling zone from top to bottom.Pellet of the present invention is controlled in shaft furnace dry zone and is roasted
600 DEG C of temperature, calcining time 10min；Preheating zone controls 1000 DEG C of maturing temperature, calcining time 15min；Roasting band control roasting
1300 DEG C of temperature, calcining time 30min；Cooling zone controls 45min cooling time.
9, the ash-laden gas being discharged at the top of shaft furnace is discharged after bag-type dust and smoke extractor pressurization.
In pellet produced by the invention, FeO content is down to 1% or less, TFe content and reaches 50% or more, pellet strength
Reach 2000N/ or more.
Embodiment 2
It is a kind of to produce acidic oxidation pellet method using nickel slag, the specific process is as follows:
1, the selection of material
Nickel slag selects grain slag, and shape is black ball shape, and granularity is -5mm, and chemical analysis is as shown in table 1.
1 nickel pulp water dreg chemistry composition of table
High silicon iron granularity of concentrate selects -200 mesh to account for mass fraction 70%, and chemical analysis is as shown in table 2.
2 high silicon iron concentrate chemical analysis of table
2, after the nickel slag by water content less than 6% is dry grinded using dry milling machine, obtaining granularity is that -200 mesh account for matter
Measure the nickel ground-slag of score 70%.
3, when water content is higher than 7.0% in high silicon iron concentrate, using the drum drier with combustion chamber, it is with coal gas
Fuel, control 800 DEG C of gas inlet temperature, 200 DEG C of flue gas exit temperature, make high silicon iron concentrate water content be down to 7.0% with
Under.
4, it after nickel ground-slag, high silicon iron concentrate and distension profit soil being carried out ingredient and mixing in the ratio of 100:90:4, is added mixed
Mixed material progress 5min profit is ground using damp mill after closing 5% moisture content of quality of material, accounts for -200 mesh in mixed material granularity
Mass fraction 80%.
5, profit grind materials use pelletising drum, and the green-ball that water content is 10%, granularity is 8mm is made.
6, moisten in grind materials balling process, sift out the unqualified green-ball of -8mm and+16mm.Unqualified green-ball returning charge is after crushing
Again pelletizing.
7, qualified green-ball is by swing material distributing machine along furnace wide direction uniform cloth to furnace roof drying bed.
8, in shaft furnace, green-ball removes mechanical water and the crystallization water in dry zone, carries out pelletizing heating and preliminary in preheating zone
Oxidation carries out the reaction such as iron oxide oxidation, decomposition of limestone and desulfuration in roasting band.Pelletizing passes through high-temperature roasting in shaft furnace,
Segment magnet mine is being oxidized to Fe203, most of bloodstone at high temperature gradually grow up and recrystallized and formed crystalline substance by crystal grain
Bridge.Meanwhile the low-melting compound generated at high temperature makes pelletizing structure finer and close, pellet strength be up to 2000N/ ball with
On, FeO content is down to 7%；Vertical pellet-roasting furnace is divided into dry zone, preheating zone, roasting band and cooling zone from top to bottom.This hair
Bright pellet controls 300 DEG C of maturing temperature, calcining time 12min in shaft furnace dry zone；600 DEG C of maturing temperature of preheating zone control,
Calcining time 20min；Roasting band control 1250 DEG C of maturing temperature, calcining time 35min；Cooling zone controls 50min cooling time.
Pellet after high-temperature roasting enters shaft furnace cooling zone, is further aoxidized by air, can make in pelletizing FeO content be down to 1% with
Under.After high temperature pelletizing and normal temperature air carry out heat exchange, it is preheating to 1100 DEG C or more of high temperature air and enters shaft roasting band
Carry out it is combustion-supporting, and oxide pellet be cooled to 120 DEG C or less from shaft furnace bottom be discharged.
9, the ash-laden gas being discharged at the top of shaft furnace is discharged after bag-type dust and smoke extractor pressurization.
In pellet produced by the invention, FeO content is down to 1% or less, TFe content and reaches 50% or more, pellet strength
Reach 2000N/ or more.
Claims (4)
1. a kind of produce acidic oxidation pellet method using nickel slag, it is characterised in that the specific process is as follows:
(1) after the nickel slag by moisture content mass content less than 6% is dry grinded using dry milling machine, obtaining granularity is that -200 mesh account for
The nickel ground-slag of mass fraction 55-70%；
(2) nickel ground-slag, high silicon iron concentrate and the bentonite 100:90-95:2-4 in mass ratio after step (1) dry grinding are matched
After material and mixing, it is added after the 5-6% moisture content of mixed material quality and 4-5min profit mill is carried out to mixed material using damp mill, make
- 200 mesh account for mass fraction 80-85% in mixed material granularity；
(3) the profit grind materials of step (2) are used into disk or pelletising drum pelletizing, it is aqueous for 10-12%, granularity that quality is made
For the green-ball of 8-16mm；
(4) the rear roasting along the uniform cloth of vertical furnace wide direction to shaft furnace furnace roof drying bed by swing material distributing machine by the green-ball of step (3)
It burns, shaft roasting is divided into dry zone, preheating zone, roasting band and cooling zone from top to bottom, and green-ball is controlled in shaft furnace dry zone and roasted
300-600 DEG C of temperature, calcining time 10-12min；Preheating zone controls 600-1000 DEG C of maturing temperature, calcining time 15-20min；
Roasting band control 1250-1300 DEG C of maturing temperature, calcining time 30-35min；Cooling zone controls 45-50min cooling time；Roasting
Burning makes pellet strength reach 2000N/ ball or more, FeO content enters shaft furnace cooling zone after being down to 5-7%, further by air
Oxidation makes in pelletizing FeO content be down to 1% and is discharged to obtain acidic oxidation pelletizing from shaft furnace bottom hereinafter, being cooled to 120 DEG C or less
Mine.
2. a kind of utilization nickel slag according to claim 1 produces acidic oxidation pellet method, it is characterised in that: nickel slag
Iron grade is 40-45%, and the Iron grade of high silicon iron concentrate is 60-62%.
3. a kind of utilization nickel slag according to claim 1 or 2 produces acidic oxidation pellet method, it is characterised in that: institute
High silicon iron concentrate is stated using the drum drier with combustion chamber, using coal dust or coal gas as fuel, controls gas inlet temperature 700-
800 DEG C, 120-200 DEG C of flue gas exit temperature, make 7.0% or less high silicon iron concentrate moisture content mass content.
4. a kind of utilization nickel slag according to claim 3 produces acidic oxidation pellet method, it is characterised in that: by step
(3) material after profit mill sifts out the unqualified green-ball returning charge of -8mm and+16mm after crushing again using disk or pelletising drum
Pelletizing.
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| CN104726698A (en) * | 2015-03-25 | 2015-06-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Acidic composite metallized pellet and production process thereof |
| CN104988302A (en) * | 2015-06-19 | 2015-10-21 | 兰州理工大学 | Nickel slag processing method for efficiently recovering iron resource |
| CN106636627A (en) * | 2016-12-13 | 2017-05-10 | 江苏省冶金设计院有限公司 | Method for producing cement clinker and oxide pellets |
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| CN106222401A (en) * | 2016-09-21 | 2016-12-14 | 内蒙古包钢钢联股份有限公司 | The preparation method of pellet |
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| CN104726698A (en) * | 2015-03-25 | 2015-06-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Acidic composite metallized pellet and production process thereof |
| CN104988302A (en) * | 2015-06-19 | 2015-10-21 | 兰州理工大学 | Nickel slag processing method for efficiently recovering iron resource |
| CN106636627A (en) * | 2016-12-13 | 2017-05-10 | 江苏省冶金设计院有限公司 | Method for producing cement clinker and oxide pellets |
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