CN107419107A - A kind of method and system for handling zinc leaching residue - Google Patents

A kind of method and system for handling zinc leaching residue Download PDF

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Publication number
CN107419107A
CN107419107A CN201710708995.0A CN201710708995A CN107419107A CN 107419107 A CN107419107 A CN 107419107A CN 201710708995 A CN201710708995 A CN 201710708995A CN 107419107 A CN107419107 A CN 107419107A
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China
Prior art keywords
zinc
pelletizing
leaching residue
reduction
entrance
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CN201710708995.0A
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Chinese (zh)
Inventor
王福佳
王建华
古明远
王敏
曹志成
王健月
吴道洪
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Jiangsu Province Metallurgical Design Institute Co Ltd
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Jiangsu Province Metallurgical Design Institute Co Ltd
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Priority to CN201710708995.0A priority Critical patent/CN107419107A/en
Publication of CN107419107A publication Critical patent/CN107419107A/en
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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
    • 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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting 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
    • 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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/20—Obtaining zinc otherwise than 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention relates to a kind of method and system for handling zinc leaching residue.Wherein, this method comprises the following steps：Prepare zinc leaching residue；Zinc leaching residue is well mixed aftershaping with binding agent, additive, obtains green pellets；Temperature of the green pellets at 900 DEG C 1150 DEG C is subjected to oxidizing roasting processing, the lead sulfate in green pellets decomposes generation lead oxide and sulfur trioxide and volatilized, and obtains ripe pelletizing；Ripe pelletizing is subjected to reduction roasting under reducing gas, reduction roasting temperature is 650 DEG C 900 DEG C, the zinc ferrite in ripe pelletizing is generated ferroso-ferric oxide and zinc oxide, pelletizing after being reduced；Mill ore magnetic selection is carried out to pelletizing after reduction, iron powder is obtained and mill selects mine tailing.The present invention realizes the separation and recovery of the different metal element such as iron and zinc in conventional zinc leaching residue, realizes the comprehensive utilization of waste resource.

Description

A kind of method and system for handling zinc leaching residue
Technical field
The invention belongs to metallurgical and energy field, in particular it relates to a kind of method and system for handling zinc leaching residue.
Background technology
China's zinc metal production and consumption figure rank first in the world, and 2013 annual productions are up to 5,300,000 t, wherein more than 70% Pass through " oxidizing roasting-Weak-acid leaching-purification-electrodeposition " conventional wet lay smelting process output.It is estimated that often produce 10,000 t electrolytic zincs The t leached muds of output 1-1.05 ten thousand, contain substantial amounts of heavy metal element in slag, such as Zn, Fe, Pb, Ga and Ag, not only waste treasured Expensive metals resources, and long-term heap is released can seriously pollute environment.Therefore, the valuable metal effectively in recovery zinc leaching residue, Not only improve and extenuate resource supply and demand contradiction, be advantageous to environmental protection again.
Mainly there are high temperature reduction volatility process and aqueous solution leaching method two types to the processing method of zinc leaching residue at present. High temperature reduction volatility process is that coke powder is incorporated in zinc leaching residue as reducing agent, and high temperature roasting is carried out in rotary kiln or fuming furnace Burning or melting, make the reduction volatilizations such as valuable metal lead, zinc, silver, indium.Aqueous solution leaching method has two types, and one kind is straight Connect and leached zinc leaching residue with acid or alkali；Be for second by zinc leaching residue between 500 DEG C -700 DEG C advance calcination, through roasting Slag after solution leaches the metal in zinc leaching residue using acid or aqueous slkali again.The advantage of high temperature reduction volatility process is can be simultaneously Lead, zinc, indium in recovery zinc leaching residue etc., these elements are all collected into zinc oxide fumes, but this method high energy consumption, and Output contains scum due to being in melt state during the zinc that volatilizees, and is mixed into a large amount of silicate in melt, causes to contain iron in scum Yield it is relatively low.The advantage of aqueous solution lixiviation process is that the content containing iron in scum after leaching reaches 55% or so, but in slag Zn content is higher, and Zn content generally more than 1%, because this part zinc mainly exists in the form of zinc ferrite, is used as in iron and smelted iron Raw material is in use, zinc can adversely affect to ironmaking processes.
The content of the invention
In view of the shortcomings of the prior art, the work of zinc and iron in zinc leaching residue is separated and recovered the invention provides a kind of Skill, it is difficult to separate the thinking that problem proposes selective reduction for zinc in zinc ferrite in zinc leaching residue and iron, and then realizes normal Advise the Selective Separation and comprehensive reutilization of different metal in zinc leaching residue.
The method of processing zinc leaching residue provided by the invention, comprises the following steps：
Prepare zinc leaching residue；
The zinc leaching residue is well mixed aftershaping with binding agent, additive, obtains green pellets；
Temperature of the green pellets at 900 DEG C -1150 DEG C is subjected to oxidizing roasting processing, oxidizing roasting time 10min- 30min, the lead sulfate in the green pellets decompose generation lead oxide and sulfur trioxide and volatilized, and obtain ripe pelletizing；
The ripe pelletizing is subjected to reduction roasting under reducing gas, reduction roasting temperature is 650 DEG C -900 DEG C, is made described Zinc ferrite generation ferroso-ferric oxide and zinc oxide in ripe pelletizing, pelletizing after being reduced；
Mill ore magnetic selection is carried out to pelletizing after the reduction, iron powder is obtained and mill selects mine tailing.
In some embodiments of the invention, the zinc leaching residue, the binding agent, the weight ratio of the additive are 100:5-8:8-10。
In some embodiments of the invention, by weight percentage, the zinc leaching residue includes full iron 25wt%- 30.5wt%, zinc 12wt%-20wt%, lead 1.0wt%-5.0wt%.
In some embodiments of the invention, temperature of the green pellets at 1000 DEG C -1150 DEG C is subjected to oxidizing roasting Processing, oxidizing roasting time 15min-20min.
In some embodiments of the invention, reduction roasting temperature is 750 DEG C -800 DEG C, reduction roasting 60min-80min.
In some embodiments of the invention, the concentration of carbon monoxide is controlled in 3%-8% in the reducing gas.
In some embodiments of the invention, P (CO)/P (CO+CO in the reducing gas2) it is 5%-25%.
In some embodiments of the invention, the mill ore magnetic selection is divided into two sections, one section of 20min-25min, magnetic field intensity For 1000Oe-1200Oe, two sections of 10min-15min, magnetic field intensity 800Oe-900Oe.
Present invention also offers a kind of system that zinc leaching residue is handled using the above method, including：
Shaped device, exported provided with zinc leaching residue entrance, binding agent entrance, additive entrance and green pellets；
Oxidizing roasting device, provided with green pellets entrance, ripe pelletizing outlet and the first flue, the green pellets entrance with it is described The green pellets outlet of shaped device is connected；
Reduction roasting device, provided with pelletizing outlet after ripe pelletizing entrance, also Primordial Qi entrance, protection gas entrance, reduction and the Two flues, the ripe pelletizing entrance are connected with the ripe pelletizing outlet of the oxidizing roasting device；
Mill ore magnetic selection device, mine tailing is selected to export provided with pelletizing entrance, iron powder outlet and mill after reduction, pelletizing after the reduction Entrance is connected with pelletizing outlet after the reduction of the reduction roasting device.
In some embodiments of the invention, the system also includes drying device and breaker, the drying device Feed(raw material)inlet and material outlet, the feed(raw material)inlet of the breaker and the drying device are respectively equipped with the breaker Material outlet be connected, the material outlet of the breaker is connected with the zinc leaching residue entrance of the shaped device.
The present invention realizes the separation and recovery of the different metal element such as iron and zinc in conventional zinc leaching residue, realizes discarded The comprehensive utilization of resource.
In the present invention, the selective reduction of zinc ferrite is laid a good foundation for separation and recovery iron and zinc so that passes through ore grinding magnetic Select technique separation of Zinc and iron to become possibility, successfully realize the recovery of zinc and iron.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
Fig. 1 is a kind of process chart of processing zinc leaching residue in the embodiment of the present invention.
Fig. 2 is a kind of structural representation of the system of processing zinc leaching residue in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and examples, the embodiment of the present invention is described in more details, so as to energy The advantages of enough more fully understanding the solution of the present invention and its various aspects.However, specific embodiments described below and reality Example is applied to be for illustrative purposes only, rather than limitation of the present invention.
As shown in figure 1, the method for processing zinc leaching residue provided by the invention comprises the following steps：
It is dry, broken：The zinc leaching residue of routine is dried and crushed, the suitable zinc of obtained drying and particle diameter leaches Slag.
In order to preferably mix and be molded afterwards, zinc leaching residue granularity preferably the accounting for below 200 mesh after crushing More than 80%.
Due to present invention focuses on being separated to zinc in zinc ferrite in zinc leaching residue and iron, thus used zinc soaks Slag tap preferably more containing zinc and iron.In the preferred embodiment of the invention, zinc leaching residue includes full iron 25wt%, and (weight percent contains Amount) -30.5wt%, zinc 12wt%-20wt%, lead 1.0wt%-5.0wt%.Wherein, zinc is mainly with ZnSO4And ZnFe2O4Shape Formula is present, and iron is mainly with ZnFe2O4Form exist.
Dry, destruction step is not that the present invention is necessary, as long as not influenceing the progress of subsequent step.
Mixing, shaping：Zinc leaching residue is well mixed aftershaping with binding agent, additive, obtains green pellets.
Binding agent used in the present invention is inorganic binder, preferably bentonite.
Currently preferred additive is lime stone, dolomite, can be used alone, can also share together.
In order to separate the zinc in zinc leaching residue and iron are more, in a preferred embodiment of the invention, zinc leaching Slag tap, the weight of binding agent, additive ratio is 100:5-8:8-10.
Oxidizing roasting：Temperature of the green pellets at 900 DEG C -1150 DEG C is subjected to oxidizing roasting processing, oxidizing roasting time is 10min-30min, the lead sulfate in green pellets decompose generation lead oxide and sulfur trioxide and volatilized, and obtain ripe pelletizing.
The decomposition temperature of lead sulfate is 1000 DEG C, and the volatilization temperature of lead oxide is 750 DEG C, 900 DEG C -1150 DEG C of temperature Lower lead sulfate decomposes generation lead oxide and sulfur trioxide and volatilized, and realizes the separation of lead and zinc and iron.In currently preferred reality Apply in example, the temperature of oxidizing roasting is 1000 DEG C -1150 DEG C.
Roasting time 10min-30min, in the preferred embodiment of the invention, oxidizing roasting time 15min- 20min.It so both can guarantee that green pellets was oxidized and be fired into acid pellet, and can ensures the abundant volatilization of lead oxide, realizes lead With the separation of zinc and iron.Lead content is less than 1wt% in pelletizing after oxidized roasting.
Reduction roasting：Ripe pelletizing is subjected to reduction roasting 50min-90min under reducing gas, reduction roasting temperature is 650 DEG C -900 DEG C, the zinc ferrite in ripe pelletizing is set to generate ferroso-ferric oxide and zinc oxide, pelletizing after being reduced.
In order to realize the generation ferroso-ferric oxide of the zinc ferrite in ripe pelletizing and zinc oxide, it is necessary to control the temperature of reduction roasting And atmosphere, in the present invention, the reducing gas of reduction roasting is carbon monoxide, concentration control 3% (volumn concentration)- 8%, and P (CO)/P (CO+CO2) it is 5%-25%.It is highly preferred that the temperature of reduction roasting is 750 DEG C -800 DEG C.Reduction roasting Time 50min-90min, more preferably 60min-80min.The concentration of carbon monoxide is more preferably 6%-8%, P (CO)/P (CO+CO2) it is more preferably 10%-20%.
Also need to be passed through protection gas during reduction roasting, conventional protection gas is N2。
Mill ore magnetic selection：Mill ore magnetic selection is carried out to pelletizing after reduction, iron powder is obtained and mill selects mine tailing.
Pelletizing realizes that zinc-iron separates by mill ore magnetic selection after reduction, wherein reclaiming Zn content in obtained iron powder< 0.5wt%.It is mainly zinc powder that mill, which is selected in mine tailing, waits further processing to carry zinc.
Iron powder is obtained in order to as much as possible, in the preferred embodiment of the invention, mill ore magnetic selection is divided into two sections, one section 20min-25min, magnetic field intensity 1000Oe-1200Oe, two sections of 10min-15min, magnetic field intensity 800Oe-900Oe.
The system that Fig. 2 show processing zinc leaching residue provided by the invention, including：Shaped device 1, oxidizing roasting device 2, Reduction roasting device 3 and mill ore magnetic selection device 4.
Shaped device 1 is provided with zinc leaching residue entrance, binding agent entrance, additive entrance and green pellets outlet.
Oxidizing roasting device 2 is provided with green pellets entrance, the outlet of ripe pelletizing and the first flue 201, green pellets entrance and shaping The green pellets outlet of device 1 is connected.
Reduction roasting device 3 is provided with ripe pelletizing entrance, also the second flue 301, Primordial Qi entrance 302, the and of protection gas entrance 303 Pelletizing exports after reduction, and ripe pelletizing entrance is connected with the ripe pelletizing outlet of oxidizing roasting device 2.
Pelletizing entrance, iron powder outlet and mill select mine tailing after mill ore magnetic selection device 4 is provided with reduction, and pelletizing entrance is with going back after reduction Pelletizing outlet is connected after the reduction of former calciner 3.
As it was previously stated, before the forming can be first dry, broken by zinc leaching residue, it is above-mentioned in the preferred embodiment of the invention System may also include drying device and breaker, and drying device and breaker are respectively equipped with feed(raw material)inlet and material outlet, The feed(raw material)inlet of breaker is connected with the material outlet of drying device, the material outlet of breaker and the zinc of shaped device 1 Leached mud entrance is connected.
Below with reference to specific embodiment, the present invention will be described.Institute's taking technique condition value is in following embodiments Exemplary, its desirable number range, for especially not dated technological parameter, can refer to often as shown in foregoing summary Rule technology is carried out.Detection method used in following embodiments is the conventional detection method of the industry.
Embodiment 1
The present embodiment is using the iron and zinc in the system recovery zinc leaching residue shown in Fig. 1 technique and Fig. 2.
The composition and content of zinc leaching residue used in the present embodiment be：Full iron is 25.5wt%, Zn content 15.6wt%, Lead content is 2.30wt%, and wherein zinc is mainly with ZnO and ZnFe2O4Form exist, iron is mainly with ZnFe2O4Form exist.
It is crushed to after first zinc leaching residue is dried below the mesh of granularity 200 and accounts for more than 80%, binding agent used is bentonite, Additive therefor is dolomite, and zinc leaching residue, bentonite, the weight ratio of dolomite are 100:8:10.By zinc leaching residue, swelling Soil, dolomite carry out pressure ball after being sent into shaped device 1 fully mixing, and oxidizing roasting dress is sent into after the green pellets drying of acquisition Put 2 and carry out oxidizing roasting at 900 DEG C, roasting time 10min, lead content is in the ripe pelletizing obtained after fired 0.80wt%.Ripe pelletizing feeding reduction roasting device 3 is reduced directly, is reduced directly 650 DEG C of temperature, the recovery time is 50min, carbonomonoxide concentration is 3%, P (CO)/P (CO+CO in reduction process2) it is 5%, pelletizing is in ore grinding after obtained reduction Concentration equipment 4 realizes that zinc-iron separates by mill ore magnetic selection, obtains iron powder and mill selects mine tailing, mill ore magnetic selection is divided into two sections, one section 20min, magnetic field intensity 1200Oe, two sections of 15min, magnetic field intensity 900Oe.
Wherein, Zn content is 0.45wt% in the iron powder for reclaiming to obtain, Iron grade 95.6%.
Embodiment 2
The present embodiment is using the iron and zinc in the system recovery zinc leaching residue shown in Fig. 1 technique and Fig. 2.
The composition and content of zinc leaching residue used in the present embodiment be：Full iron is 28.5wt%, Zn content 16.4wt%, Lead content is 3.20wt%, and wherein zinc is mainly with ZnO and ZnFe2O4Form exist, iron is mainly with ZnFe2O4Form exist.
It is crushed to after first zinc leaching residue is dried below the mesh of granularity 200 and accounts for more than 80%, binding agent used is bentonite, Additive therefor is dolomite, and zinc leaching residue, bentonite, the weight ratio of dolomite are 100:5:8.By zinc leaching residue, bentonite, Dolomite carries out pressure ball after being sent into shaped device 1 fully mixing, and oxidizing roasting device 2 is sent into after the green pellets drying of acquisition Carry out oxidizing roasting at 1150 DEG C, roasting time 30min, lead content is in the ripe pelletizing obtained after fired 0.50wt%.Ripe pelletizing feeding reduction roasting device 3 is reduced directly, is reduced directly 900 DEG C of temperature, the recovery time is 90min, carbonomonoxide concentration is 8%, P (CO)/P (CO+CO in reduction process2) it is 25%, pelletizing is being ground after obtained reduction Ore deposit concentration equipment 4 realizes that zinc-iron separates by mill ore magnetic selection, obtains iron powder and mill selects mine tailing, mill ore magnetic selection is divided into two sections, one section 25min, magnetic field intensity 1000Oe, two sections of 10min, magnetic field intensity 800Oe.
Wherein, Zn content is 0.4wt% in the iron powder for reclaiming to obtain, Iron grade 96.8%.
Embodiment 3
The present embodiment is using the iron and zinc in the system recovery zinc leaching residue shown in Fig. 1 technique and Fig. 2.
The composition and content of zinc leaching residue used in the present embodiment be：Full iron is 27.6wt%, Zn content 18.2wt%, Lead content is 4.50wt%, and wherein zinc is mainly with ZnO and ZnFe2O4Form exist, iron is mainly with ZnFe2O4Form exist.
It is crushed to after first zinc leaching residue is dried below the mesh of granularity 200 and accounts for more than 80%, binding agent used is bentonite, Additive therefor is lime stone, and zinc leaching residue, bentonite, the weight ratio of lime stone are 100:7:9.By zinc leaching residue, bentonite, Lime stone carries out pressure ball after being sent into shaped device 1 fully mixing, and oxidizing roasting device 2 is sent into after the green pellets drying of acquisition Carry out oxidizing roasting at 1100 DEG C, roasting time 20min, lead content is in the ripe pelletizing obtained after fired 0.65wt%.Ripe pelletizing feeding reduction roasting device 3 is reduced directly, is reduced directly 780 DEG C of temperature, the recovery time is 70min, carbonomonoxide concentration is 6%, P (CO)/P (CO+CO in reduction process2) it is 15%, pelletizing is being ground after obtained reduction Ore deposit concentration equipment 4 realizes that zinc-iron separates by mill ore magnetic selection, obtains iron powder and mill selects mine tailing, mill ore magnetic selection is divided into two sections, one section 22min, magnetic field intensity 1100Oe, two sections of 13min, magnetic field intensity 850Oe.
Wherein, Zn content is 0.32wt% in the iron powder for reclaiming to obtain, Iron grade 96.2%.
It was found from above-described embodiment, present invention process flow is simple, and obtained iron powder zinc content is few, and Iron grade is high.
To sum up, the present invention realizes the separation and recovery of the different metal element such as iron and zinc in conventional zinc leaching residue, realizes The comprehensive utilization of waste resource.
In the present invention, the selective reduction of zinc ferrite is laid a good foundation for separation and recovery iron and zinc so that passes through ore grinding magnetic Select technique separation of Zinc and iron to become possibility, successfully realize the recovery of zinc and iron.
Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and not to embodiment Limit.For those of ordinary skill in the field, other multi-forms can also be made on the basis of the above description Change or variation.There is no necessity and possibility to exhaust all the enbodiments.And thus amplify out apparent Change or change still in protection scope of the present invention among.

Claims (10)

  1. A kind of 1. method for handling zinc leaching residue, it is characterised in that comprise the following steps：
    Prepare zinc leaching residue；
    The zinc leaching residue is well mixed aftershaping with binding agent, additive, obtains green pellets；
    Temperature of the green pellets at 900 DEG C -1150 DEG C is subjected to oxidizing roasting processing, the lead sulfate in the green pellets decomposes Generation lead oxide and sulfur trioxide simultaneously volatilize, and obtain ripe pelletizing；
    The ripe pelletizing is subjected to reduction roasting under reducing gas, reduction roasting temperature is 650 DEG C -900 DEG C, makes the ripe ball Zinc ferrite generation ferroso-ferric oxide and zinc oxide in group, pelletizing after being reduced；
    Mill ore magnetic selection is carried out to pelletizing after the reduction, iron powder is obtained and mill selects mine tailing.
  2. 2. according to the method for claim 1, it is characterised in that the zinc leaching residue, the binding agent, the additive Weight ratio is 100:5-8:8-10.
  3. 3. according to the method for claim 1, it is characterised in that by weight percentage, the zinc leaching residue includes full iron 25wt%-30.5wt%, zinc 12wt%-20wt%, lead 1.0wt%-5.0wt%.
  4. 4. according to the method for claim 1, it is characterised in that enter temperature of the green pellets at 1000 DEG C -1150 DEG C Row oxidizing roasting is handled.
  5. 5. according to the method for claim 1, it is characterised in that reduction roasting temperature is 750 DEG C -800 DEG C.
  6. 6. according to the method for claim 1, it is characterised in that the concentration control of carbon monoxide exists in the reducing gas 3%-8%.
  7. 7. according to the method for claim 1, it is characterised in that P (CO)/P (CO+CO in the reducing gas2) it is 5%- 25%.
  8. 8. according to the method for claim 1, it is characterised in that the mill ore magnetic selection is divided into two sections, one section of 20min- 25min, magnetic field intensity 1000Oe-1200Oe, two sections of 10min-15min, magnetic field intensity 800Oe-900Oe.
  9. A kind of 9. system of any methods described processing zinc leaching residue in 1-8 using claim, it is characterised in that including：
    Shaped device, exported provided with zinc leaching residue entrance, binding agent entrance, additive entrance and green pellets；
    Oxidizing roasting device, provided with green pellets entrance, the outlet of ripe pelletizing and the first flue, the green pellets entrance and the shaping The green pellets outlet of device is connected；
    Reduction roasting device, provided with pelletizing outlet and the second cigarette after ripe pelletizing entrance, also Primordial Qi entrance, protection gas entrance, reduction Road, the ripe pelletizing entrance are connected with the ripe pelletizing outlet of the oxidizing roasting device；
    Mill ore magnetic selection device, mine tailing is selected to export provided with pelletizing entrance, iron powder outlet and mill after reduction, pelletizing entrance after the reduction Pelletizing outlet is connected after reduction with the reduction roasting device.
  10. 10. system according to claim 9, it is characterised in that the system also includes drying device and breaker, institute State drying device and the breaker is respectively equipped with feed(raw material)inlet and material outlet, the feed(raw material)inlet of the breaker and institute The material outlet for stating drying device is connected, the zinc leaching residue entrance phase of the material outlet of the breaker and the shaped device Even.
CN201710708995.0A 2017-08-17 2017-08-17 A kind of method and system for handling zinc leaching residue Pending CN107419107A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108950184A (en) * 2018-08-03 2018-12-07 中南大学 A method of zinc being recycled from ferrous acid zinc resource using magnetizing roast-ammonia leaching process
CN111979422A (en) * 2020-07-09 2020-11-24 有研资源环境技术研究院(北京)有限公司 Method for comprehensively recovering valuable metals in goethite slag

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108950184A (en) * 2018-08-03 2018-12-07 中南大学 A method of zinc being recycled from ferrous acid zinc resource using magnetizing roast-ammonia leaching process
CN111979422A (en) * 2020-07-09 2020-11-24 有研资源环境技术研究院(北京)有限公司 Method for comprehensively recovering valuable metals in goethite slag

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