CN110317949A - A kind of preparation method of zinc-containing dust pelletizing - Google Patents

A kind of preparation method of zinc-containing dust pelletizing Download PDF

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CN110317949A
CN110317949A CN201910718475.7A CN201910718475A CN110317949A CN 110317949 A CN110317949 A CN 110317949A CN 201910718475 A CN201910718475 A CN 201910718475A CN 110317949 A CN110317949 A CN 110317949A
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zinc
containing dust
green
ball
pelletizing
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CN110317949B (en
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朱德庆
郭正启
潘建
李启厚
王定政
杨聪聪
李紫云
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Central South University
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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
    • C22B1/16—Sintering; Agglomerating
    • C22B1/216—Sintering; Agglomerating in rotary furnaces
    • 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
    • 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
    • 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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/02—Preliminary treatment of ores; Preliminary refining of zinc oxide
    • 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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/02—Working-up flue dust
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
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  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention provides a kind of preparation methods of zinc-containing dust pelletizing, comprising steps of S1, ingredient: the zinc-containing dusts such as blast furnace cloth bag ash, steel-making ladle ashes, steelmaking converter flue dust are mixed to obtain mixture with fine powder containing charcoal；S2, pretreatment: in the mixture in Xiang Suoshu step S1 plus water is soaked, and material curing is stored up and sealed after wetting；S3, compound binding agent is added into the mixture of the curing and mixes to mix and expects；S4, the mixing material prepared in the step S3 progress pelletizing is obtained into green-ball；S5, the green-ball in the step S4 is dried to obtain zinc-containing dust dry bulb group.This dry bulb group compression strength is high, Well-recovered, and degree of metalization height, dezincification effect are good in Direct Reduction, solves the technical issues of existing zinc-containing dust pelletizing easily rupturable in reduction process, dusting.

Description

A kind of preparation method of zinc-containing dust pelletizing
Technical field
The present invention relates to field of steel metallurgy, in particular to a kind of preparation method of zinc-containing dust pelletizing.
Background technique
The Dust Capacity that steel manufacture process generates typically constitutes from the 8~15% of output of steel, is one rich in elements such as iron, zinc, carbon Kind has the secondary resource of larger utility value.But zinc-containing dust belongs to dangerous solid waste.Therefore, suitable work is developed Skill is recycled these dust, not only contributes to improve resource utilization, and can solve iron and steel enterprise's dust and bring Problem of environmental pollution.
The main technique of pyrogenic attack zinc-containing dust dezincification has rotary kiln reducing process and rotary hearth furnace reduction technique, important Process is the preparation of zinc-containing dust pelletizing.Pellet quality quality directly affects dezincification technological effect and product quality.Publication No. The patent of CN 102776309A discloses a kind of processing method of steel plant's zinc-containing dust, by steel plant's zinc-containing dust, coal dust and Binder mixes manufacture green-ball in proportion, and then green-ball is distributed into rotary hearth furnace and carries out high temperature reduction, and is passed through into rotary hearth furnace Gaseous fuel and combustion air collect slag iron mixture and rotary hearth furnace flue gas after reduction；The slag iron mixture of collection passes through Crushing and screening obtains sponge iron and clinker；The flue gas being collected into is passed through wet scrubber, at the same spray into mass fraction be 2%~ 5% dilute sulfuric acid is electrolysed solution of zinc sulfate by the zinc contained in rotary hearth furnace flue gas reaction at solution of zinc sulfate, obtains zinc and dilute Sulfuric acid, the flue gas discharge after dedusting.The technique is to improve pellet strength, is up to 4%~8% in balling process additive amount, Therefore cause process energy consumption height, cost big.The patent of Publication No. CN 106399700A discloses a kind of processing zinc-containing dust Method and its system, zinc-containing dust, reducing agent and binder are mixed, moisten mill, pelletizing and drying and processing pelletizing；Drying The feed inlet that pelletizing passes through annular roaster is wired on siege, is discharged finally by the discharge port of cooling furnace chamber；Subsequently into general Roasted product carries out ore grinding, magnetic separation, obtains metal iron powder and magnetic separation tailings；And the high-temperature flue gas generated eventually enters into zinc recovering system System collects the valuable metal dust volatilized.Binder used in the patent is bentonite or starch solution, addition Amount is 1%~5%, and to further increase pellet strength, uses profit mill pretreatment dust.Therefore, consumption of binder is big, at This height, due to using liquid-containing binder, addition and using difficult, and require profit mill pretreatment, further increase ore grinding this One process cost.Further, since zinc-containing dust granularity is natively very thin, profit mill pretreatment can further increase fineness, reduce life Ball burst temperature damages the thermal stability of green-ball, seriously affects intensity of the green-ball in subsequent processes.Publication No. CN The patent of 101386913B discloses the method for recovering zinc oxide in Zn-containing dust treatment by rotary hearth furnace, by 10~30% coals, 70~ 90% zinc-containing dust, 1~5% additive are by progress ingredient；Green-ball is pressed into after matched raw material is mixed evenly；By the green-ball Be distributed into regenerative rotary hearth furnace, be heated to 1100 DEG C~1350 DEG C, keep being restored for 10~30 minutes, obtain zinc-containing dust and Metallize iron charge.The patent includes flux and single organic adhesive used in the balling process, and additive amount is higher, is 1 ~5%.
Summary can be seen that at present in zinc-containing dust balling process, generally existing consumption of binder is big, binder is single, former Expect that improper without pretreating process or pretreating process, preparation pellet strength is poor, enter after kiln pelletizing in reduction process it is easily rupturable, Dusting, obtained iron-containing product are mainly that powdery or intensity are too poor, cannot directly enter blast furnace and are smelted, can only return to sintering Stable operation, dezinc degree and the whereabouts for going back original product of dezincification technical process are seriously affected into blast furnace ironmaking again after agglomeration.Strengthen The preparation of zinc-containing dust pelletizing has weight to improving subsequent technique yield, improving product quality and optimizing the whereabouts for going back original product Want meaning.
Summary of the invention
The present invention provides a kind of preparation methods of zinc-containing dust pelletizing, and its purpose is to improve zinc-containing dust pelletizing Intensity avoids zinc-containing dust pelletizing from generating rupture dusting during rotary kiln dezincification, ring formation of rotary kiln phenomenon is eliminated, to mention High rotary kiln yield improves reduction product quality.
In order to achieve the above object, the embodiment provides a kind of preparation methods of zinc-containing dust pelletizing, including Step:
S1, ingredient: zinc-containing dust material, carbon, the Tie Biwei 0.10~0.25 of the material are equipped with；
S2, pretreatment: in the zinc-containing dust material in Xiang Suoshu step S1 plus water soaks, and material heating is stored up and sealed after wetting Curing；
S3, into the material after the curing, addition weight percentage is that 0.6%~1.0% compound binding agent must mix Material, the compound binding agent include bentonite and polyacrylamide, and the weight ratio of the bentonite and polyacrylamide is 70~ 90:30~10；
S4, the mixing material pelletizing prepared in the step S3 is obtained into green-ball；
S5, the green-ball in the step S4 is dried to obtain zinc-containing dust dry bulb group.
Wherein, the zinc-containing dust material in the step S1 includes blast furnace cloth bag ash, steel-making ladle ashes and steelmaking converter Flue dust it is one or more.
Wherein, the step S1 further include: be added in Xiang Suoshu zinc-containing dust material and mix to obtain mixture, institute containing carbon fine powder State the carbon of mixture, weight of iron ratio is 0.10~0.25.
Wherein, the step S2 specifically: add 10%- in the zinc-containing dust material or mixture in Xiang Suoshu step S1 13% water is soaked, and the time of wetting is 10min~20min, stores up and seal material curing 20min~40min, the temperature of material Degree rises 15 DEG C~35 DEG C.
Wherein, the step S4 specifically: by mixing material addition disc balling machine progress pelletizing, the time of pelletizing is 15min~25min, the moisture of green-ball are 14%~15%, and the granularity of green-ball is 10mm~20mm.
Wherein, the step S5 on band drier specifically, be dried the green-ball, the height of the bed of material For 80mm~180mm.The bed of material is dried, dry temperature is 250 DEG C~350 DEG C, and dry wind speed is 0.8m/s ~1.2m/s, dry time are 7min~15min, bed depth 80mm-180mm.
Above scheme of the invention have it is following the utility model has the advantages that
(1) the present invention provides a kind of preparation method of zinc-containing dust pelletizing, the zinc-containing dust is added water wetting, stockpiling It carries out being uniformly mixed so as to obtain mixture, the compound additive packet after sealing the pretreatments such as material curing, then by adding compound binding agent Include bentonite and polymer substance polyacrylamide, then carry out pelletizing, obtain green-ball, the mixture overcome zinc-containing dust at The weak feature of ball, not only lower than 1%, (conventional single binder bentonite or starch dosage are up to 1- to consumption of binder 8%), and the drop strength of green-ball increases substantially, and it is (raw when conventional binders+profit mill pretreatment to be all larger than 12 times/0.5m Ball drop strength is generally 4-5 times/0.5m)；The especially described green-ball passes through the dry bulb being dried to obtain, and dry bulb drop strength is higher than 3 times/1m (common process drop strength is 0 time/1m), dry bulb compression strength is up to 200N/ or more (common process dry bulb resistance to compression Intensity is generally 20-50N/) so that zinc-containing dust pellet strength increases substantially.The present invention makes full use of zincilate grit Thin advantage is spent, according to its material performance feature, stockpiling has been invented and has sealed material curing pretreating process, main function is to make to contain Calcium oxide in zinc powder dirt sufficiently digests, particle surface adsorbs enough moisture, improves the hydrophilicity of dust particles；It is curing While, a large amount of calcium hydroxide colloids itself formed in zinc-containing dust mixture are a kind of binders, have bonds well Property, so as to improve the balling-up of mixture.In addition, because the hydration reaction of calcium oxide and calcium silicates mineral is released greatly in maturing process The heat of amount reinforces the diffusion of hydrone, improves particle surface wetting ability, is conducive to balling-up.Polyacrylamide is a kind of high score Sub- binder, molecular weight is big, molecular chain length, can form macromolecule bridging (work of building bridge between the particle in zinc-containing dust mixture With), the particle of dispersion is linked up.In addition, the present invention is the compound use of organic binder and inorganic binder, sufficiently tie The good advantage of sticky strong, inorganic binder the thermal stability of organic binder is closed, so that compound binding agent effect be made to be better than Single inorganic or organic binder.The wetting of mixture and seal material curing pretreatment and compound binding agent good result it is advantageous Phase superposition is acted on, not only increases substantially green ball strength, thermal stability and dry bulb intensity, but also consumption of binder significantly subtracts It is few, to have to reduce production cost.
(2) green-ball warp of the zinc-containing dust by wetting and the collective effect preparation for sealing material curing pretreatment and compound binding agent Cross dry, obtained dry bulb intensity has reached the index request of rotary kiln reduction, avoid its is generated in reduction process it is damaged with Dusting, to eliminate ring formation of rotary kiln hidden danger.Obtained reducting pellet degree of metalization and compression strength height, zinc and alkali metal contains Measure low, zinc removal efficiency is high, can be directly entered blast furnace ironmaking, without returning to sintering for agglumeration, greatly improve present invention process Competitiveness.To also turn out that zinc-containing dust pellet quality prepared by the present invention is good.
Detailed description of the invention
Fig. 1 is flow chart prepared by zinc-containing dust pelletizing of the invention.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool Body embodiment is described in detail.
Comparative example 1
Zinc-containing dust pelletizing is prepared according to conventional pellet forming process, comprising steps of
(1) ingredient: being 32.42% by blast furnace cloth bag ash, steel-making ladle ashes and steelmaking converter flue dust by weight: 63.46%:4.12% carries out mixing to obtain mixed dust；
(2) being added in the carbon containing dedusting ash from coke oven in the mixed dust prepared in Xiang Suoshu step (1) must mix Material, makes carbon, the weight of iron ratio 0.35 of mixture；
(3) 10% water is added in the mixture prepared in Xiang Suoshu step (2) to be soaked, the time of wetting is 10min adds 1.5% bentonite, and material must be mixed after mixing well；
(4) it puts mixing material into disc balling machine kind and carries out pelletizing, the time of pelletizing is 20min, the moisture of green-ball Control is 14% or so, and granularity control of green-ball is in 8~16mm；
The shatter strength of green pellet prepared can reach 38N/ up to 3.5 times/0.5m, compression strength, burst temperature 430 ℃。
(5) green-ball is dried on belt type roasting machine, dry temperature is 270~300 DEG C, and dry wind speed is 0.8~1.2m/s, 80~120mm of bed depth, 10~15min of drying time；
Obtained dry bulb drop strength is 5.2 times/0.5m and 2.3 time/1m, and compression strength 50N is a-1.Dry bulb intensity is low In rotary kiln for directly reducing requirement.
(6) dry bulb is packed into rotary kiln, is passed through gas-fired, under the conditions of 1150~1250 DEG C of temperature, reduction 50min is cooled down under the protective condition of nitrogen, obtains reducting pellet.
Reducting pellet degree of metalization 74.45%, residual Zn content 0.582%, reduction process dezinc degree 84.96%, K2O removing Rate is 35.6%, Na2O removal efficiency is 40.1%.In addition, reduction process pelletizing powder phenomenon-tion is serious, reducting pellet compression strength It is low.Therefore, reducting pellet zinc content and intensity index are not achieved into furnace requirement.
In addition, recycling obtains the secondary zinc oxide containing zinc 43.2%, zinc recovery 81.4% from rotary kiln flue dust.Due to Pelletizing dusting is serious, and Dust Capacity is big, and Iron Ore Powder is mixed into flue dust, causes secondary zinc oxide grade low.
Comparative example 2
Zinc-containing dust pelletizing is prepared according to conventional pellet forming process, comprising steps of
(1) ingredient: being 32.42% by blast furnace cloth bag ash, steel-making ladle ashes and steelmaking converter flue dust by weight: 63.46%:4.12% carries out mixing to obtain mixture；
(2) carbonaceous dust from coke oven is added in the mixture prepared in the step (1), the mixture Carbon, weight of iron ratio are 0.25；
(3) 10% water is added in the mixture prepared in Xiang Suoshu step (2) to be soaked, the time of wetting is 10min adds 1.5% bentonite, and material must be mixed after mixing well；
(4) it puts mixing material into disc balling machine progress pelletizing and obtains green-ball, the time of pelletizing is 20min, green-ball Moisture control 14.5%, granularity control of green-ball is in 8~16mm；
The shatter strength of green pellet prepared can reach 46N/ up to 4.1 times/0.5m, compression strength, burst temperature 420 ℃。
(5) green-ball is dried on belt type roasting machine, dry temperature is 270~300 DEG C, dry wind speed 0.8~1.2m/s, 80~120mm of bed depth, 10~15min of drying time；
Obtained dry bulb drop strength is 5.2 times/0.5m and 3.0 time/1m, and compression strength 70N is a-1.Dry bulb intensity is low In rotary kiln for directly reducing requirement.
(6) dry bulb is packed into rotary kiln, is passed through gas-fired, under the conditions of 1150~1250 DEG C of temperature, reduction After 50min, is cooled down under the protective condition of nitrogen, obtain reducting pellet.
Reducting pellet degree of metalization 80.46%, residual Zn content still have 0.68%, and reduction process dezinc degree only 79.36% takes off Zinc effect is poor.K2O removal efficiency is 37.5%, Na2O removal efficiency is 39.2%.Reduction process pelletizing powder phenomenon-tion is serious, goes back protocorm Group does not have intensity substantially.Therefore, rotary kiln requirement is not achieved in reducting pellet zinc content and intensity index.
In addition, recycling obtains the secondary zinc oxide containing zinc 40.1%, zinc recovery 78.6% from dust.Due to pelletizing powder Change seriously, Dust Capacity is big, causes secondary zinc oxide grade low.It cannot reach into furnace requirement.
Embodiment 1
The present invention is directed to existing problem, provides a kind of preparation method of zinc-containing dust pelletizing, includes the following steps:
(1) ingredient: being 32.42% by blast furnace cloth bag ash, steel-making ladle ashes and steelmaking converter flue dust by weight: 63.46%:4.12% carries out being mixed to get mixed dust；
(2) the carbon containing dedusting ash from coke oven is added in the mixed dust prepared in Xiang Suoshu step (1) and obtains mixture, The carbon of the mixture, the mass ratio of iron are 0.25；
(3) it pre-processes: water being added in the mixture prepared in Xiang Suoshu step (2) and is soaked, the additive amount of the water The 10% of mixture total weight is accounted for, then material curing 20min, mixture warm are stored up and sealed to mixture by wetting time 10min Degree increases 15 DEG C or so；
(4) into mixture, the compound binding agent of addition 1% is uniformly mixed, and must mix material, the compound binding agent includes The weight ratio of bentonite and polyacrylamide, the bentonite and polyacrylamide is 80:20；
(5) it will mix and expect to be added disc balling machine progress pelletizing, and obtain green-ball, Balling time 15min, the control of green-ball moisture 14.5% or so, green-ball granularity is controlled in 10mm~20mm；
The shatter strength of green pellet prepared can reach 56N up to 15.5 times/0.5m, compression strength-1, burst temperature is 406℃；
(6) green-ball is dried on belt type roasting machine, drying temperature is 300 DEG C, dry wind speed 0.8m/s, and the bed of material is high Spend 80mm, drying time 7.5min；
12.4 times/0.5m and 4.3 time/1m of obtained dry bulb drop strength, compression strength can be up to 210N-1.Dry bulb is strong Degree has reached rotary kiln for directly reducing requirement.
(7) dry bulb is packed into rotary kiln, is passed through gas-fired direct-reduction, the temperature of reduction is 1250 DEG C, reduction Time 50min, cooling in nitrogen after reduction, obtained reduction dezincification pelletizing.
The reduction dezincification pelletizing degree of metalization 84.56%, compression strength 1690N-1, the residual Zn content of reducting pellet 0.086%, reduction process dezinc degree is up to 94.1%.K2O removal efficiency is 50.2%, Na2O removal efficiency is 52.3%.Reducting pellet Well-tended appearance, no dusting and fragmentation.Therefore, reducting pellet zinc content and intensity index have reached to enter furnace requirement, can directly use In blast furnace ironmaking.Recycling obtains the secondary zinc oxide containing zinc 60.1%, zinc recovery 92.3% from rotary kiln flue dust.
Compared with comparative example 1 and 2, shatter strength of green pellet, compression strength and dry bulb intensity are significantly improved, and especially dry bulb is strong Degree has reached rotary kiln for directly reducing requirement, wants so that reducting pellet zinc content and intensity index have reached blast furnace feeding It asks, and significantly improves dezinc degree and alkali metal removal efficiency.
Embodiment 2
The present invention is directed to existing problem, provides a kind of preparation method of zinc-containing dust pelletizing, includes the following steps:
(1) ingredient: being 32.42% by blast furnace cloth bag ash, steel-making ladle ashes and steelmaking converter flue dust by weight: 63.46%:4.12% carries out being mixed to get zinc-containing dust；
(2) fine grinding bituminous coal is added in the zinc-containing dust prepared in Xiang Suoshu step (1) and obtains mixture, make the mixture Carbon, iron mass ratio be 0.25；
(3) it pre-processes: water being added in the mixture prepared in Xiang Suoshu step (2) and is soaked, the additive amount of the water The 12% of mixture total weight is accounted for, then material curing 30min, mixture warm are stored up and sealed to mixture by wetting time 20min Degree increases 20 DEG C or so；
(4) into the mixture after step curing, the compound binding agent of addition 0.6% is uniformly mixed, and must mix material, described Compound binding agent includes bentonite and polyacrylamide, and the weight ratio of the bentonite and polyacrylamide is 70:30；
(5) it will mix and expect to be added disc balling machine progress pelletizing, and obtain green-ball, Balling time 20min, the control of green-ball moisture 14.5% or so, green-ball granularity is controlled in 10mm~20mm；
The shatter strength of green pellet prepared can reach 54N up to 13.6 times/0.5m, compression strength-1, burst temperature is 395℃。
(6) green-ball is dried on belt type roasting machine, drying temperature is 250 DEG C, dry wind speed 1.2m/s, and the bed of material is high Spend 100mm, drying time 10min；
16.3 times/0.5m and 7.7 time/1m of obtained dry bulb drop strength, compression strength can be up to 235N-1；
(7) will dry bulb be packed into rotary kiln in be passed through gas-fired and direct-reduction, restore temperature be 1250 DEG C, reduction Time 90min, cooling in nitrogen after reduction, obtained reduction dezincification pelletizing.
Obtained reduction dezincification pelletizing degree of metalization 86.54%, compression strength 1895N-1, the residual Zn content of reducting pellet 0.060%, reduction process dezinc degree is 96.3%.K2O removal efficiency is 51.9%, Na2O removal efficiency is 53.0%.Outside reducting pellet See intact, no dusting and fragmentation.Therefore, reducting pellet zinc content and intensity index have reached to enter furnace requirement, are used directly for Blast furnace ironmaking.Recycling obtains the secondary zinc oxide containing zinc 63.2%, zinc recovery 93.5% from rotary kiln flue dust.
Compared with comparative example 1 and 2, shatter strength of green pellet, compression strength and dry bulb intensity are significantly improved, and especially dry bulb is strong Degree has reached rotary kiln for directly reducing requirement, so that reducting pellet zinc content and intensity index have reached to enter furnace requirement, and Significantly improve dezinc degree and alkali metal removal efficiency.
Compared with Example 1, although binder proportion is declined, shatter strength of green pellet, compression strength are declined, Since drying system optimizes, dry bulb intensity is improved.As the recovery time extends, reducting pellet degree of metalization, dezinc degree and Alkali metal removal efficiency increases.Especially reducting pellet resistance to compression is significantly raised, and mainly dry bulb intensity gets a promotion and restores Time extends.
Embodiment 3
The present invention is directed to existing problem, provides a kind of preparation method of zinc-containing dust pelletizing, includes the following steps:
(1) ingredient: being 32.42% by blast furnace cloth bag ash, steel-making ladle ashes and steelmaking converter flue dust by weight: 63.46%:4.12% carries out being mixed to get zinc-containing dust；
(2) the carbon containing dedusting ash from coke oven is added in the zinc-containing dust prepared in Xiang Suoshu step (1)
Mixture is obtained, the carbon of the mixture, the mass ratio 0.25 of iron are made；
(3) it pre-processes: water being added in the mixture prepared in Xiang Suoshu step (2) and is soaked, the additive amount of the water The 13% of mixture total weight is accounted for, then mixture is stored up and sealed material curing 30min, makes mixture by wetting time 10min Temperature increases 20 DEG C or so；
(4) into mixture, the compound binding agent of addition 0.8% is uniformly mixed, and must mix material, the compound binding agent packet Include bentonite and polyacrylamide, the weight ratio of the bentonite and polyacrylamide is 90:10；
(5) it will mix and expect to be added disc balling machine progress pelletizing, and obtain green-ball, Balling time 15min, the control of green-ball moisture 14.5% or so, green-ball granularity is controlled in 10mm~20mm；
The shatter strength of green pellet prepared can reach 69N up to 9.4 times/0.5m, compression strength-1, burst temperature 415 ℃。
(6) green-ball is dried on belt type roasting machine, drying temperature is 350 DEG C, dry wind speed 0.8m/s, and the bed of material is high Spend 180mm, drying time 15min；
10.5 times/0.5m and 3.3 time/1m of obtained dry bulb drop strength compression strength can be up to 220N-1。
(7) dry bulb is packed into rotary kiln and is reduced directly under the conditions of 1110 DEG C of temperature, the time 120min of reduction, also It is cooling in nitrogen after original, obtained reduction dezincification pelletizing.In reduction period, every 3min~5min be added into kiln 5mm~ The lignite of 25mm, the total carbon iron ratio of the lignite are 0.55.Lead to nitrogen cooling, dry type magnetic separation separation after reduction, obtains gold Belong to pellet and nonmagnetics.
Obtained reducting pellet degree of metalization 84.55%, compression strength 910N-1, the residual Zn content of reducting pellet 0.092%, reduction process dezinc degree is higher than 92.5%.K2O removal efficiency is 60.9%, Na2O removal efficiency is 58.3%.Reducting pellet Well-tended appearance, no dusting and fragmentation.Therefore, reducting pellet zinc content and intensity index have reached to enter furnace requirement, can directly use In blast furnace ironmaking.Recycling obtains the secondary zinc oxide containing zinc 64.6%, zinc recovery 91.4% from rotary kiln flue dust.
Compared with comparative example 1 and 2, shatter strength of green pellet, compression strength and dry bulb intensity are significantly improved, and especially dry bulb is strong Degree has reached rotary kiln for directly reducing requirement, so that reducting pellet zinc content and intensity index have reached to enter furnace requirement, and Significantly improve dezinc degree and alkali metal removal efficiency.
Compared with Example 1, binder proportion is declined, and wherein high polymer binder proportion also declines, green-ball Drop strength is declined, but compression strength and burst temperature are increased, and dry bulb intensity is also declined.Generally green-ball and Dry bulb intensity is much higher than conventional iron ore pellets.Since reduction temperature declines, but because carbon weight of iron is than improving, reducting pellet metal Rate and compression strength are substantially close, and dezinc degree and alkali metal removal efficiency increase.
Compared with Example 2, binder proportion is increased, but wherein high polymer binder proportion significantly reduces, green-ball Drop strength is declined, and compression strength and burst temperature are increased, and dry bulb intensity is also declined.Generally green-ball and dry Ball intensity is much higher than conventional iron ore pellets.Since reduction temperature declines, although carbon weight of iron, than improving, reducting pellet metallizes Rate, compression strength and dezinc degree are declined, but alkali metal removal efficiency is increased.
Embodiment 4
The present invention is directed to existing problem, provides a kind of preparation method of zinc-containing dust pelletizing, includes the following steps:
(1) ingredient: being 32.42% by blast furnace cloth bag ash, steel-making ladle ashes and steelmaking converter flue dust by weight: 63.46%:4.12% carries out mixing to obtain mixture, does not add extra solids fuel, the carbon weight of iron ratio in the zinc-containing dust It is 0.10；
(2) it pre-processes: water being added in the mixture prepared in Xiang Suoshu step (1) and is soaked, the additive amount of the water The 13% of mixture total weight is accounted for, then material curing 40min, the temperature of material are stored up and sealed to mixture by wetting time 10min Degree increases 35 DEG C or so；
(3) compound binding agent of addition 0.8% is uniformly mixed in the mixture in step (2), must mix material, described multiple Closing binder includes bentonite and polyacrylamide, and the mass ratio of the bentonite and polyacrylamide is 90:10
(4) it will mix and expect to be added disc balling machine progress pelletizing, and obtain green-ball, Balling time 25min, the control of green-ball moisture 14.9% or so, green-ball granularity is controlled in 10~20mm；
The shatter strength of green pellet prepared can reach 68N up to 12.6 times/0.5m, compression strength-1, burst temperature is 390℃。
(5) green-ball is dried on belt type roasting machine, drying temperature is 350 DEG C, dry wind speed 0.8m/s, and the bed of material is high Spend 180mm, drying time 15min；
12.8 times/0.5m and 3.9 time/1m of obtained dry bulb drop strength compression strength can be up to 230N-1。
(6) dry bulb is packed into rotary kiln and is reduced directly under the conditions of 1100 DEG C of temperature, the time 120min of reduction, also It is cooling in nitrogen after original, obtained reduction dezincification pelletizing.During reduction, it is added 5-25mm's into kiln every 3~5min Bituminous coal, the carbon iron ratio of the bituminous coal are 0.45, and total carbon weight of iron ratio is 0.55.Lead to nitrogen cooling, dry type magnetic after reduction Choosing separation, obtains metallized pellet and nonmagnetics.
Metallized pellet degree of metalization has 97.02%, and compression strength 880N is a-1.The residual Zn content of metallized pellet 0.03%, dezinc degree 99.0%.K2O removal efficiency is 66.2%, Na2O removal efficiency is 65.5%.Reducting pellet well-tended appearance, nothing Dusting and fragmentation.Therefore, reducting pellet zinc content and intensity index have reached to enter furnace requirement, are used directly for blast furnace ironmaking. Recycling obtains the secondary zinc oxide containing zinc 68.5%, zinc recovery 96.5% from rotary kiln flue dust.
Compared with comparative example 1 and 2, shatter strength of green pellet, compression strength and dry bulb intensity are significantly improved, and especially dry bulb is strong Degree has reached rotary kiln for directly reducing requirement, so that reducting pellet zinc content and intensity index have reached to enter furnace requirement, and Significantly improve dezinc degree and alkali metal removal efficiency.
Compared with Example 3, binder proportion is identical, but makees reducing agent with fine powder containing charcoal due to not interior, and green-ball is fallen Intensity is significantly raised, but compression strength and burst temperature are declined, and dry bulb intensity is increased.Generally green-ball and dry bulb is strong Degree is much higher than conventional iron ore pellets.Although reduction temperature and time, carbon weight of iron ratio do not change, due to without interior coal blending, Reduction process China and foreign countries coal amount increases, and reducing atmosphere enhancing, reducting pellet degree of metalization and compression strength increase, dezinc degree and alkali Metal removal rate increases.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (6)

1. a kind of preparation method of zinc-containing dust pelletizing, which is characterized in that comprising steps of
S1, ingredient: zinc-containing dust material, carbon, the Tie Biwei 0.10~0.25 of the mixture are equipped with；
S2, pretreatment: in the zinc-containing dust material in Xiang Suoshu step S1 plus water soaks, and stores up and seals after wetting and expects that heating is ripe Change；
S3, into the mixture after the curing, addition weight percentage is that 0.6%~1.0% compound binding agent must mix Material, the compound binding agent include bentonite and polyacrylamide, and the weight ratio of the bentonite and polyacrylamide is 70~ 90:30~10；
S4, the mixing material pelletizing prepared in the step S3 is obtained into green-ball；
S5, the green-ball in the step S4 is dried to obtain zinc-containing dust dry bulb group.
2. the preparation method of zinc-containing dust pelletizing according to claim 1, which is characterized in that contain zinc in the step S1 Particulate dust includes that blast furnace cloth bag ash, steel-making ladle ashes and the one or more of steelmaking converter flue dust mix.
3. according to claim 1 or the preparation method of zinc-containing dust pelletizing described in 2, which is characterized in that the step S1 is also It include: to be added to mix to obtain mixture containing carbon fine powder into the zinc-containing dust material, carbon, the weight of iron ratio of the mixture are 0.10~0.25.
4. the preparation method of zinc-containing dust pelletizing according to claim 3, which is characterized in that the step S2 specifically: In zinc-containing dust mixture into the step S1 plus 10%~13% water is soaked, the time of wetting be 10min~ 20min stores up and seals material curing 20min~40min, and the temperature of material rises 15 DEG C~35 DEG C.
5. the preparation method of zinc-containing dust pelletizing according to claim 1, which is characterized in that the step S4 specifically: The mixing is expected that disc balling machine, which is added, carries out pelletizing, the time of pelletizing is 15min~25min, and the moisture of green-ball is 14% ~15%, the granularity of green-ball is 10mm~20mm.
6. the preparation method of zinc-containing dust pelletizing according to claim 5, which is characterized in that the step S5 specifically, The green-ball is dried on band drier, the height of the bed of material is 80mm~180mm, and dry temperature is 250 DEG C~350 DEG C, dry wind speed is 0.8m/s~1.2m/s, and the dry time is 7min~15min.
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CN113718102A (en) * 2021-09-09 2021-11-30 宝武集团环境资源科技有限公司 Electric furnace ash ball making process
CN113981216A (en) * 2021-10-21 2022-01-28 广东华欣环保科技有限公司 Method for treating undersize powder of metallized pellet of rotary hearth furnace
CN114214513A (en) * 2021-11-26 2022-03-22 武汉钢铁有限公司 Preparation method of high-pressure-resistance press ball with metal rate of more than 95%
CN114574692A (en) * 2022-02-23 2022-06-03 中南大学 Preparation method of carbon-containing micro-electrolysis material

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110788113A (en) * 2019-10-17 2020-02-14 宝武集团环境资源科技有限公司 Method for inhibiting zinc-containing dust pellets from reduction degradation in rotary hearth furnace
CN110788113B (en) * 2019-10-17 2021-06-29 宝武集团环境资源科技有限公司 Method for inhibiting zinc-containing dust pellets from reduction degradation in rotary hearth furnace
CN113718102A (en) * 2021-09-09 2021-11-30 宝武集团环境资源科技有限公司 Electric furnace ash ball making process
CN113981216A (en) * 2021-10-21 2022-01-28 广东华欣环保科技有限公司 Method for treating undersize powder of metallized pellet of rotary hearth furnace
CN113981216B (en) * 2021-10-21 2023-02-28 广东华欣环保科技有限公司 Treatment method of undersize powder of metallized pellet of rotary hearth furnace
CN114214513A (en) * 2021-11-26 2022-03-22 武汉钢铁有限公司 Preparation method of high-pressure-resistance press ball with metal rate of more than 95%
CN114214513B (en) * 2021-11-26 2023-12-01 武汉钢铁有限公司 Preparation method of high-pressure-resistance pressed ball with metal rate reaching above 95%
CN114574692A (en) * 2022-02-23 2022-06-03 中南大学 Preparation method of carbon-containing micro-electrolysis material

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