CN107686895A - A kind of metallurgical solid waste method of comprehensive utilization - Google Patents

A kind of metallurgical solid waste method of comprehensive utilization Download PDF

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Publication number
CN107686895A
CN107686895A CN201710765253.1A CN201710765253A CN107686895A CN 107686895 A CN107686895 A CN 107686895A CN 201710765253 A CN201710765253 A CN 201710765253A CN 107686895 A CN107686895 A CN 107686895A
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CN
China
Prior art keywords
slag
metallurgical
zinc
solid waste
comprehensive utilization
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710765253.1A
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Chinese (zh)
Inventor
李菊艳
张国兴
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Wisdri Engineering and Research Incorporation Ltd
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Wisdri Engineering and Research Incorporation Ltd
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Priority to CN201710765253.1A priority Critical patent/CN107686895A/en
Publication of CN107686895A publication Critical patent/CN107686895A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • C22B7/04—Working-up slag
    • 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
    • C22B19/04—Obtaining zinc by distilling
    • 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
    • C22B7/001—Dry processes
    • 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

Abstract

The invention discloses a kind of metallurgical solid waste method of comprehensive utilization, iron content carbon zinc fume mud is added in the tapping process of high-temperature slag, make full use of carbon resource in dross sensible heat and dirt mud, reduction reaction occurs with iron, zinc in high-temperature slag and dirt mud, realizes the synchronous recovery of the valuable resource such as iron, zinc in dirt mud and slag；While after iron removaling and zinc, the composition and the type of cooling of slag are mixed by controlling, the high value added utilization of remaining slag can be achieved.The present invention makes full use of high-temperature slag waste heat, can effectively solve the problems, such as that Zinc-Bearing Wastes return to sintering and recycle the Zinc form brought enrichment and influence smooth operation of furnace, and the high value added utilization and clean manufacturing of slag are realized, there is good economy and environmental benefit, be adapted to popularization and application.

Description

A kind of metallurgical solid waste method of comprehensive utilization
Technical field
The invention belongs to metallurgical fixed-end forces technical field, and in particular to a kind of using metallurgical slag and the solid waste of metallurgical dust sludge Method of comprehensive utilization.
Background technology
Metallurgical dust sludge is the main flue dust class discarded object of steel and iron industry production process discharge, and discharge capacity is about crude steel yield 10% or so.With the 8.08 hundred million tons of calculating of China's crude steel yield in 2016, the yield of dirt mud is about 80,800,000 tons, plus heap over the years The quantity deposited, metallurgical dust sludge enormous amount.Iron content about 30-40% in dirt mud, containing zinc about 2-3%, part dirt mud carbon containing about 15~ 30%.If all realizing recycling, ten thousand tons of annual recyclable iron about 2000-3000, about 2,000,000 tons of zinc is reclaimed, reclaims carbon 4800000 tons of carbon, alternative substantial amounts of mineral resources, remarkable in economical benefits.Metallurgical dust sludge generally use returns to sintering processes at present Method, but bring Zinc form to be enriched with, the problem of influenceing blast fumance direct motion, pyrogenic attack Zinc-Bearing Wastes are preferable methods, But thermal process investment height, technique, equipment are complicated, high energy consumption, are unfavorable for large-scale promotion use.
Metallurgical cinder is the high-temperature fusion discarded object discharged in Production Process for Steel Enterprise, mainly blast furnace cinder and converter Slag, ton iron blast furnace slag discharge capacity about 300~400kg, ton steel converter slag discharge capacity about 100kg.Blast furnace slag mainly uses at present It is used as cement admixture after Water Quenching, vessel slag using the stewing processing of heat, is used for water after making free calcium oxide, magnesia resolution more Mud, brickmaking, the production such as pave the way, but slag complicated component, grindability and poor activity, compared to blast furnace water quenching slag, added value of product It is low.
At present, existing patent, document modify or are blown carbon reducing agent with regard to vessel slag, modification is reported that its shortcoming is Substantial amounts of coal dust, quartz sand or lime are consumed, coal dust is added by injection method, adds equipment complexity and investment, this Outside, just do not carry the slag after iron to make further research and handle, whole process economy is bad, it is difficult to industrializes.
The content of the invention
It is an object of the present invention to provide a kind of metallurgical solid waste method of comprehensive utilization, and the metallurgical dust sludge of iron content carbon zinc is added into high temperature In slag tapping process, reduction occurs instead using iron, zinc in the carbon resource in dross sensible heat and metallurgical dust sludge and slag and dirt mud Should, realize the recovery of iron, zinc resource in dirt mud and slag；Solve Zinc-Bearing Wastes and return to the Zinc form enrichment that sintering recycling is brought Problem, while high-temperature slag waste heat is effectively utilized, there is good economy and environmental benefit.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of metallurgical solid waste method of comprehensive utilization, it comprises the following steps：By caused high temperature melting in steel smelting procedure Slag is added in the metallurgical furnace equipped with metallurgical dust mud ball, and the composition that compound is formed to high-temperature slag and metallurgical dust sludge ball is adjusted Control, reaction generation molten iron, mixing slag and zinc fume, and control MgO, CaO, Al obtained by gained mixing slag2O3、SiO2Quaternary Each component and its content are in slag system：MgO<20%, 40%<CaO<80%, Al2O3<10%, SiO2<50%；Gained molten iron passes through Tapping device discharge recovery molten iron, zinc fume reclaim to obtain zinc powder through trapping；Mix slag and carry out slow cooling or quickly cooling processing, respectively Construction material or clinker.
In such scheme, the temperature of the high-temperature slag is more than 1400 DEG C；High-temperature slag injection metallurgical furnace speed be Below 1t/s, to promote each component in compound to be sufficiently mixed reduction.
Preferably, the high-temperature slag is melting vessel slag.
In such scheme, the metallurgical dust sludge is in sintering dirt mud, blast furnace dust, blast furnace gas mud, electric furnace dust mud etc. One or more.
In such scheme, the particle diameter of the metallurgical dust mud ball is 3~20mm.
In such scheme, the metallurgical dust mud ball is formed by metallurgical dust sludge and additive progress batch mixing, pelletizing, drying.
In such scheme, the additive includes adjustable gained MgO, CaO, the Al such as coal dust, quartz sand, lime stone2O3、 SiO2One or more in quaternary slag system component；The additive be used for adjust gained compound in carbon, CaO、Al2O3、SiO2, the system content such as MgO, make in gained mixing slag key component and its content control in MgO<20%, 40%<CaO<80%, Al2O3<10%, SiO2<50%.
When producing above-mentioned mixing slag, according to the composition of the composition requirement of mixing slag, blast furnace cinder and metallurgical dust sludge Information, additive is further introduced into the feed, make CaO, Al in gained mixing slag2O3、SiO2, MgO quaternarys slag system meet on State component requirements.
Preferably, oxygen atom content sum in ferriferous oxide is controlled in dirt mud in ferriferous oxide, zinc oxide, metallurgical cinder Mol ratio with carbon content in gained compound is 1:(0.8~2.0).
In such scheme, the input amount of the dirt mud ball is less than the 50% of metallurgical cinder quality.
Preferably, the input amount of the dirt mud ball is the 10~30% of metallurgical cinder quality.
In such scheme, the slow cooling speed is less than 1 DEG C/s；The quickly cooling speed is 1 DEG C/more than s.
Preferably, the slow cooling speed is 2 DEG C/below s, promotes mixing slag to form dicalcium silicate ore deposit phase；The quickly cooling Speed is 5 DEG C/more than s, promotes mixing slag to form tricalcium silicate ore deposit phase.
Invention has the beneficial effect that：
1) process equipment that is related to is simple, cost of investment is low, profitable；
2) make full use of the carbon resource in metallurgical cinder sensible heat and metallurgical dust sludge, it is synchronous preferably reclaim iron in metallurgical solid waste, The valuable elements such as zinc, economic benefit and environmental benefit are notable；
3) the zinc fume removing dust device that reduction obtains reclaims to obtain zinc powder, solves metallurgical dust sludge containing zinc in iron and steel enterprise During recycling, the problem of bringing Zinc form enrichment and influence smooth operation of furnace；
4) instead of steel slag hot stewing, fine grinding, magnetic separation put forward the tediously long treatment process such as iron, disposable recovery obtains high temperature liquid iron For making steel, remarkable in economical benefits；
5) reclaiming the mixing slag formed after the valuable metals such as iron, zinc must build respectively through be incubated cooling or quickly cool down Material or clinker are built, significantly improves the added value of steel slag utilization, and the basic zero emission of whole production process, is recycled profit With waste material, clean manufacturing is realized.
Embodiment
For a better understanding of the present invention, with reference to the specific embodiment content that the present invention is furture elucidated, but this hair Bright content is not limited solely to the following examples.
In following examples, mainly composition and its shared mass percent are in the coal dust：Fixed carbon 68%, ash content 12%, moisture 2%；SiO in the quartz sand of use2Shared mass percent is 90%.
Embodiment 1
A kind of metallurgical solid waste method of comprehensive utilization, it comprises the following steps：
1) dispensing：The present embodiment is carried out using high-temperature fusion vessel slag, blast furnace dust, coal dust as raw material to raw material proportioning Calculate, calculate CaO, Al in control gained compound2O3、SiO2, MgO formed quaternary slag system in quality percentage shared by each composition Than for：CaO 67.48%, SiO223.04%, MgO 5.47%, Al2O34.01%, and control ferriferous oxide, zinc in dirt mud Oxygen atom content sum and the mol ratio of carbon content in gained compound are in ferriferous oxide in oxide, metallurgical cinder 1.2；Each raw material composition and its content are shown in Table 1；
2) dirt mud pelletizing：Coal dust is well mixed with blast furnace dust, and it is 3-20mm lifes to be pressed into granularity with ball press Ball, be then fed into drying box dry, be sent into drying box it is dry metallurgical dust mud ball, be re-fed into preheater and carry out being preheated to 500 DEG C (preheating energy derives from high-temperature flue gas caused by metallurgical dust sludge reduction reaction)；
3) the metallurgical dust mud ball input after preheating is carried in the ladle furnace of tapping device, and with below 0.2t/s speed The high-temperature fusion vessel slag that implantation temperature is 1450 DEG C carries out batch mixing, metallurgical dust mud ball is sufficiently mixed with high-temperature fusion vessel slag And react and must mix slag, flue dust (zinc fume) and molten iron；
4) smoke catching recovery zinc powder：Caused flue dust reclaims to obtain zinc by petticoat pipe and dust arrester trapping in mixing process Powder, high-temperature flue gas can be used for preheating dirt mud ball；
5) molten iron reclaims：Gained molten iron is deposited on ladle furnace bottom, and is discharged by tapping device, reclaims to obtain molten iron；
6) after the completion of reacting, remaining mixing slag in ladle furnace is quickly cooled down with 5 DEG C/s speed, obtains cement Clinker.
Quaternary slag system ingredient is CaO 67.5%, SiO in mixing slag obtained by the present embodiment223.03%, MgO 5.47%, Al2O34.0% or so, by controlling slag cooling velocity, the clinker rich in tricalcium silicate can be obtained.
The main composition and its content (wt%) of raw material described in the embodiment 1 of table 1
Material name TFe CaO SiO2 MgO Al2O3 FeO Fe2O3 Zn C Raw material proportioning
Blast furnace dust 37.59 2.74 4.82 1.68 6.38 4 49.26 2.241 28.879 8.59
Vessel slag 22.4 42.7 13.9 3.3 1.7 28.8 0 0 0 85.92
Coal dust - 0.7 14.68 3.49 3.5 - - - 68 5.49
Compound composition 22.51 37.02 13.16 3.17 2.20 25.13 4.24 0.19 6.22 100
Embodiment 2
A kind of metallurgical solid waste method of comprehensive utilization, it comprises the following steps：
1) dispensing：The present embodiment is matched somebody with somebody using high-temperature fusion vessel slag, blast furnace dust, coal dust, quartz sand as raw material to raw material Than being calculated, CaO, Al in compound in control gained compound2O3、SiO2, MgO formed quaternary slag system in each composition institute Accounting for mass percent is：CaO 65.6%, SiO225.14%, MgO 5.31%, Al2O33.89%, and control iron in dirt mud Carbon content in oxygen atom content sum and gained compound in ferriferous oxide in oxide, zinc oxide, metallurgical cinder Mol ratio is 1:1.2；Each raw material composition and its content are shown in Table 2；
2) dirt mud pelletizing：Quartz sand, coal dust are well mixed with blast furnace dust, and it is 3- to be pressed into granularity with ball press 20mm green-balls, be then fed into drying box dry, be sent into drying box it is dry metallurgical dust mud ball, be re-fed into preheater and preheated To 700 DEG C (preheating energy derives from high-temperature flue gas caused by metallurgical dust sludge reduction reaction)；
3) the metallurgical dust mud ball input after preheating is carried in the ladle furnace of tapping device, and with below 0.3t/s speed The high-temperature fusion vessel slag that implantation temperature is 1500 DEG C carries out batch mixing, metallurgical dust mud ball is sufficiently mixed with high-temperature fusion vessel slag And reduce and must mix slag, flue dust (zinc fume) and molten iron；
4) smoke catching recovery zinc powder：Caused flue dust reclaims to obtain zinc by petticoat pipe and dust arrester trapping in mixing process Powder, high-temperature flue gas can be used for preheating dirt mud ball；
5) molten iron reclaims：Gained water is deposited on ladle furnace bottom, and is discharged by tapping device, reclaims to obtain molten iron；
6) after the completion of reacting, remaining mixing slag in ladle furnace is subjected to slow cooling processing with 0.1 DEG C/s speed, then The clinker of efflorescence is poured out out of ladle furnace, is used as construction material after carrying out common magnetic separation.
Quaternary slag system ingredient obtained by mixing slag obtained by the present embodiment is CaO 65.78%, SiO224.97%, MgO 5.33%, Al2O33.92% or so, by controlling slag Slow cooling, dicalcium silicate crystal is can obtain, while in Slow cooling During, dicalcium silicate crystalline transformation can be achieved the efflorescence of slag, facilitate slag to pour out into the dilatable dicalcium silicate of volume, As construction material.
The main composition and its content (wt%) of raw material described in the embodiment 2 of table 2
Title TFe CaO SiO2 MgO Al2O3 FeO Fe2O3 Zn C Proportioning
Blast furnace dust 37.59 2.74 4.82 1.68 6.38 4 49.26 2.241 28.879 8.46
Vessel slag 22.4 42.7 13.9 3.3 1.7 28.8 0 0 0 84.6
Coal dust - 0.7 14.68 3.49 3.5 - - - 68 5.4
Quartz sand 90 1.54
Compound composition 22.13 36.39 14.46 3.12 2.16 24.70 4.17 0.19 6.11 100
The foregoing describe general principle, principal character and the advantages of the present invention of the present invention.The technical staff of the industry should The understanding, the present invention is not limited to the above embodiments, and the description in above-described embodiment and specification simply illustrates the present invention Principle, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, and these change and changed Enter to both fall within the range of claimed invention.The claimed scope of the invention is by affiliated claims and its waits Effect thing defines.

Claims (8)

1. a kind of metallurgical solid waste method of comprehensive utilization, it is characterised in that it comprises the following steps：It will be produced in steel smelting procedure High-temperature slag add in the metallurgical furnace equipped with metallurgical dust mud ball, the composition of compound is formed to high-temperature slag and metallurgical dust sludge ball Regulated and controled, reaction generation molten iron, mixing slag and zinc fume, and control MgO, CaO, Al obtained by gained mixing slag2O3、 SiO2Each component and its content are in quaternary slag system：MgO<20%, 40%<CaO<80%, Al2O3<10%, SiO2<50%；Institute Obtain molten iron and discharge recovery molten iron through tapping device, zinc fume reclaims to obtain zinc powder through trapping；Slag is mixed to carry out at slow cooling or quickly cooling Reason, construction material or clinker are obtained respectively.
2. metallurgical solid waste method of comprehensive utilization according to claim 1, it is characterised in that the temperature of the high-temperature slag is More than 1400 DEG C.
3. metallurgical solid waste method of comprehensive utilization according to claim 1, it is characterised in that the particle diameter of the metallurgical dust mud ball For 3~20mm.
4. the metallurgical solid waste method of comprehensive utilization according to any one of claims 1 to 3, it is characterised in that the metallurgical dust Mud ball is formed by metallurgical dust sludge and additive progress batch mixing, pelletizing, drying.
5. metallurgical solid waste method of comprehensive utilization according to claim 4, it is characterised in that the additive is coal dust, stone One or more in sand, lime stone.
6. metallurgical solid waste method of comprehensive utilization according to claim 1, it is characterised in that the input amount of the dirt mud ball is Less than the 50% of metallurgical cinder quality.
7. metallurgical solid waste method of comprehensive utilization according to claim 1, it is characterised in that the slow cooling speed is less than 1 ℃/s；The quickly cooling speed is 1 DEG C/more than s.
8. metallurgical solid waste method of comprehensive utilization according to claim 1, it is characterised in that the slow cooling speed is 2 DEG C/s Below；The quickly cooling speed is 5 DEG C/more than s.
CN201710765253.1A 2017-08-30 2017-08-30 A kind of metallurgical solid waste method of comprehensive utilization Pending CN107686895A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111575492A (en) * 2020-06-30 2020-08-25 中冶南方工程技术有限公司 Comprehensive treatment method for zinc-containing dust and steel slag

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1211629A (en) * 1998-07-31 1999-03-24 宝山钢铁(集团)公司 Treatment method for high zinc containing iron dust
CN102382912A (en) * 2011-11-14 2012-03-21 中冶南方工程技术有限公司 Method for treating blast furnace slag
CN102719575A (en) * 2011-03-29 2012-10-10 鞍钢股份有限公司 Converter slag modifier and manufacture and using method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1211629A (en) * 1998-07-31 1999-03-24 宝山钢铁(集团)公司 Treatment method for high zinc containing iron dust
CN102719575A (en) * 2011-03-29 2012-10-10 鞍钢股份有限公司 Converter slag modifier and manufacture and using method thereof
CN102382912A (en) * 2011-11-14 2012-03-21 中冶南方工程技术有限公司 Method for treating blast furnace slag

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111575492A (en) * 2020-06-30 2020-08-25 中冶南方工程技术有限公司 Comprehensive treatment method for zinc-containing dust and steel slag

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Application publication date: 20180213