CN106119529A - The direct reduction process of zinc leaching residue and system - Google Patents
The direct reduction process of zinc leaching residue and system Download PDFInfo
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- CN106119529A CN106119529A CN201610623858.2A CN201610623858A CN106119529A CN 106119529 A CN106119529 A CN 106119529A CN 201610623858 A CN201610623858 A CN 201610623858A CN 106119529 A CN106119529 A CN 106119529A
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- leaching residue
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- 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
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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
- C22B7/04—Working-up slag
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- 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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Abstract
The invention discloses direct reduction process and the system of zinc leaching residue, wherein, direct reduction process includes: zinc leaching residue is carried out drying and processing, in order to obtain being dried zinc leaching residue；Described dry zinc leaching residue is carried out break process, in order to obtain zinc leaching residue granule；Described zinc leaching residue granule and additive, reduction coal are carried out mixed-forming, in order to obtain pelletizing material；And described pelletizing material is carried out direct-reduction process in direct-reduction rotary hearth furnace, in order to obtain the flue gas containing zinc, lead, silver and indium and metallized pellet.The method solves, by dispensing and moulding process, the phenomenon that pelletizing easily melts, and is effectively improved direct-reduction temperature, promotes lead, zinc, silver, the volatilization of indium.
Description
Technical field
The invention belongs to metallurgical technology field.Specifically, the present invention relates to the direct reduction process of zinc leaching residue and be
System.
Background technology
In a large amount of lead smelting gas that Zinc Hydrometallurgy Process produces, the most all contain dissipated metal, noble metal and other have valency golden
Belong to, typically divide direct method and indirect method two class to the recovery process of these metals.Direct method is using lead smelting gas as primary raw material, choosing
Select technique aptly the valuable metal in slag is reclaimed.
Zinc hydrometallurgy is the most most widely used current zinc metallurgy method, and the electric zinc yield produced by the method accounts for always
The 85% of zinc yield.Zinc hydrometallurgy has conventional solvent extraction method, volatility process hot acid leaching, hot acid to leach hematite process, hot acid leaching
Go out goethite process, oxygen leaching method etc..
In Zinc Hydrometallurgy Process, leaching the cadmia obtained in using two sections typically has two kinds of techniques to reclaim, and one is fire
Method, i.e. uses rotary kiln evaporation method；Another kind is wet method, i.e. hot acid solvent extraction method.In cadmia, the form that is primarily present of zinc is ferrous acid
Zinc, zinc oxide, zinc sulfide and zinc silicate, indium is mainly, in the materials such as the existence of class matter in-phase version and zinc ferrite, to divide at zinc ferrite
While solution, indium reduces after being also decomposed, and is changed in gas entrance rotary kiln flue gas and reclaims.Silver mainly with Argentous sulfide.,
A small amount of native silver and parcel silver exist.Rotary kiln evaporation method is the typical process that China's zinc hydrometallurgy Slag treatment uses, domestic warp
Crossing the development in more than 30 years, its technology is the most ripe, and the existing more zine-smelting plant with strain smelting as representative uses.Zinc kiln slag is wet method
Leached mud during zinc metallurgy again with addition of 40%～50% coke powder, operating condition difference needs to allocate into the coke powder of 80%～100%,
The residue after the metal such as zinc, lead is extracted under high temperature in rotary kiln.By again being leached by kiln slag, acid consumption is huge.Separately
Outward, 92～94% zinc and 82～84% lead and the silver of about 10% can be reclaimed by rotary kiln fuming volatilization, the volatility of indium <
80%.The advantage of kiln process is that the volatilization response rate of lead and zinc is high, but shortcoming is the most clearly.First, kiln process is to silver
Recovering effect excessively poor, the overwhelming majority silver can not reclaim, 70% remain in volatilization kiln slag in, and kiln slag select further silver return
Yield also after 50～65%, cause a large amount of losses of noble metal.Secondly, processing one ton of leached mud needs expensive coke,
Refractory consumption rate is big.
Ferrovanadium slag that hot acid extract technology flow process obtains and lead smelting gas, due to this type of slag melting point the lowest (< 1200 DEG C), directly
Connecing reduction temperature to be restricted, the volatility of the lead zinc indium of effumability reduces rapidly due to material melting, and the volatility of silver is also
Only about 30%.
Summary of the invention
It is contemplated that one of technical problem solved the most to a certain extent in correlation technique.To this end, the present invention carries
Go out direct reduction process and the system of a kind of zinc leaching residue, the method and system and solve pelletizing by dispensing and ball press technique
The easily phenomenon of fusing, is effectively increased direct-reduction temperature, promotes lead, zinc, silver, the volatilization of indium.
According to an aspect of the present invention, the present invention proposes the direct reduction process of a kind of zinc leaching residue, including:
Zinc leaching residue is carried out drying and processing, in order to obtain being dried zinc leaching residue；
Described dry zinc leaching residue is carried out break process, in order to obtain zinc leaching residue granule；
Described zinc leaching residue granule and additive, reduction coal are carried out mixed-forming, in order to obtain pelletizing material；And
Described pelletizing material is carried out direct-reduction process in direct-reduction rotary hearth furnace, in order to obtain containing zinc, lead, silver
Flue gas and metallized pellet with indium.
Ferrovanadium slag that generally hot acid extract technology flow process obtains and lead smelting gas, owing to this type of slag melting point is the lowest, generally
Less than 1200 DEG C, therefore it is reduced directly temperature limited.If slag is reduced directly, the temperature of direct-reduction melting higher than slag
Point, therefore in Direct Reduction, material melts causes the volatile substances volatilities such as lead zinc indium silver to reduce rapidly, Qi Zhongyin
Volatility also only about 30%.
Thus use the direct reduction process of the zinc leaching residue of the above embodiment of the present invention, by zinc leaching residue by dispensing and
Ball press technique, can be effectively improved direct-reduction temperature, promotes lead, zinc, silver, the volatilization of indium.Thus solve pelletizing easily melt, lead zinc
The problem that silver indium removal efficiency is low.
It addition, the direct reduction process of zinc leaching residue according to the above embodiment of the present invention can also have following additional
Technical characteristic:
In some embodiments of the invention, described additive is bentonite and/or kieselguhr.
In some embodiments of the invention, the addition of described additive is the 8-15 weight of described zinc leaching residue granule
Amount %.
In some embodiments of the invention, the temperature that described direct-reduction processes is 1200-1350 degree Celsius.
In some embodiments of the invention, the temperature that described direct-reduction processes is 1300-1330 degree Celsius.
In some embodiments of the invention, the time that described direct-reduction processes is 20-50 minute.
In some embodiments of the invention, the addition of described reduction coal is the 10-40 weight of described zinc leaching residue granule
Amount %.
According to the second aspect of the invention, the present invention also proposes the direct of a kind of zinc leaching residue being adapted for carrying out and above implementing
The system of method of reducing, this system includes:
Drying device, described drying device has zinc leaching residue entrance and the outlet of dry zinc leaching residue；
Breaker, described breaker has dry zinc leaching residue entrance and zinc leaching residue particle outlet, described dry
Zinc leaching residue entrance is connected with the outlet of described dry zinc leaching residue；
Mixed-forming device, described mixed-forming device has zinc leaching residue particle entrance, additive entrance, reduction coal enter
Mouth and pelletizing material outlet, described zinc leaching residue particle entrance is connected with described zinc leaching residue particle outlet；
Direct-reduction rotary hearth furnace, described direct-reduction rotary hearth furnace has pelletizing material inlet, exhanst gas outlet and metallization ball
Group's outlet, described pelletizing material inlet is connected with described pelletizing material outlet.
Thus use the direct-reduction system of the zinc leaching residue of the above embodiment of the present invention, by zinc leaching residue by mixing
After carrying out dispensing and molding in shaped device, direct-reduction temperature can be effectively improved, promote lead, zinc, silver, the volatilization of indium.Thus
Solve the problem that pelletizing easily melts, lead zinc-silver indium removal efficiency is low.
It addition, the direct-reduction system of zinc leaching residue according to the above embodiment of the present invention can also have following additional
Technical characteristic:
In some embodiments of the invention, described additive entrance includes bentonite entrance and/or kieselguhr entrance.
Accompanying drawing explanation
Fig. 1 is the flow chart of the direct reduction process of zinc leaching residue according to an embodiment of the invention.
Fig. 2 is the structural representation of the direct-reduction system of zinc leaching residue according to an embodiment of the invention.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish
Same or similar label represents same or similar element or has the element of same or like function.Below with reference to attached
The embodiment that figure describes is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
According to an aspect of the present invention, the present invention proposes the direct reduction process of a kind of zinc leaching residue, below with reference to
Fig. 1 describes the direct reduction process of the zinc leaching residue of the specific embodiment of the invention in detail.
The direct reduction process of the zinc leaching residue according to the specific embodiment of the invention includes: carried out at drying by zinc leaching residue
Reason, in order to obtain being dried zinc leaching residue；Dry zinc leaching residue is carried out break process, in order to obtain zinc leaching residue granule；By zinc
Leached mud granule and additive, reduction coal carry out mixed-forming, in order to obtain pelletizing material；And by pelletizing material directly also
Direct-reduction process is carried out, in order to obtain the flue gas containing zinc, lead, silver and indium and metallized pellet in former rotary hearth furnace.
Ferrovanadium slag that generally hot acid extract technology flow process obtains and lead smelting gas, owing to this type of slag melting point is the lowest, generally
Less than 1200 DEG C, therefore it is reduced directly temperature limited.If slag is reduced directly, the temperature of direct-reduction melting higher than slag
Point, therefore in Direct Reduction, material melts causes the volatile substances volatilities such as lead zinc indium silver to reduce rapidly, Qi Zhongyin
Volatility also only about 30%.
Thus use the direct reduction process of the zinc leaching residue of the above embodiment of the present invention, by zinc leaching residue by dispensing and
Ball press technique, can be effectively improved direct-reduction temperature, promotes lead, zinc, silver, the volatilization of indium.Thus solve pelletizing easily melt, lead zinc
The problem that silver indium removal efficiency is low.
According to a particular embodiment of the invention, dry zinc leaching residue specifically can be crushed to granularity for no more than 3mm
Zinc leaching residue granule.Inventor finds, granularity is excessive, is unfavorable for the volatilization of lead, zinc, silver, indium, and controls particle diameter and be not more than
3mm can improve the volatility of lead, zinc, silver, indium to greatest extent.
According to a particular embodiment of the invention, additive is bentonite and/or kieselguhr.Inventor finds, by adding
Bentonite and kieselguhr are remarkably improved the fusing point of pelletizing, and then prevent pelletizing from melting under the high temperature of direct-reduction.With
Time bentonite may also operate as the effect of pellet binder, strengthen the fall strength of briquette of pelletizing to more than 20 times.Thus can be effective
Prevent the pelletizing explosion efflorescence that in slag, the phase decomposition of ferrovanadium thing occurs.
According to a particular embodiment of the invention, bentonite and/or kieselguhr are zinc leaching residue as the addition of additive
8-15 weight % of granule.According to the concrete example of the present invention, if addition is too low, carry dystectic DeGrain, with
Time cementation inadequate, pelletizing easily bursts；If addition is too high, cost increases, and effective treating capacity of slag reduces simultaneously.
According to a particular embodiment of the invention, by by permissible to addition bentonite and/or kieselguhr in zinc leaching residue granule
It is effectively improved the fusing point of pelletizing material.And then indirectly improve the temperature that direct-reduction processes, improve direct-reduction effect.Specifically
The temperature that direct-reduction processes can be 1200-1350 degree Celsius.At such a temperature, material pelletizing will not melt.Pelletizing
In lead, zinc, silver, indium can fully be volatilized.According to the concrete example of the present invention, by allocating in zinc leaching residue granule
Bentonite and/or kieselguhr, can significantly improve the fusing point of pelletizing.Preferably, the temperature that direct-reduction processes can be 1300-
1330 degrees Celsius, the time that direct-reduction processes is 20-50 minute.Control this condition and can ensure that pelletizing will not melt,
Direct reduction reactor efficiency can be improved to greatest extent so that lead, zinc, silver, indium can fully be volatilized simultaneously.
According to a particular embodiment of the invention, use the direct reduction process of the zinc leaching residue of above-described embodiment, can realize
Lead, zinc, indium volatility are more than 98%, the silver volatility technical specification more than 95%.
According to a particular embodiment of the invention, the addition of reduction coal is 10-40 weight % of zinc leaching residue granule.Thus
The reduction coal adding above-mentioned quality can ensure that the fully reduction of pelletizing material and maintains the reduction being reduced directly in rotary hearth furnace
Property atmosphere.Inventor finds, if the amount of allocating into is too low is not enough to realize the reduction of compound in slag, and maintains around pelletizing
Reducing atmosphere, the amount of allocating into is too high, can cause pelletizing efflorescence, and after efflorescence, cadmia powder easily enters rotary hearth furnace flue, affects secondary
The grade of dust, causes the waste of reducing agent simultaneously, increases cost.
According to a further aspect in the invention, the invention allows for the system of the direct reduction process of a kind of zinc leaching residue,
This system is adapted for carrying out the direct reduction process of the zinc leaching residue of preceding embodiment.Present invention tool is described in detail below with reference to Fig. 2
The direct-reduction system of the zinc leaching residue of body embodiment.
The direct-reduction system of the zinc leaching residue according to the specific embodiment of the invention includes: drying device 10, breaker
20, mixed-forming device 30, it is reduced directly rotary hearth furnace 40, wherein, drying device 10 has zinc leaching residue entrance 11 and dry zinc
Leached mud outlet 12；Breaker 20 has dry zinc leaching residue entrance 21 and zinc leaching residue particle outlet 22, is dried zinc and leaches
Slag entrance 21 is connected with dry zinc leaching residue outlet 12；Mixed-forming device 30 has zinc leaching residue particle entrance 31, additive
Entrance 32, reduction coal entrance 33 and pelletizing material outlet 34, zinc leaching residue particle entrance 31 and zinc leaching residue particle outlet 22 phase
Even；Direct-reduction rotary hearth furnace 40 has pelletizing material inlet 41, exhanst gas outlet 42 and metallized pellet outlet 43, and pelletizing material enters
Mouth 41 is connected with pelletizing material outlet 34.
Thus use the direct-reduction system of the zinc leaching residue of the above embodiment of the present invention, by zinc leaching residue by mixing
After carrying out dispensing and molding in shaped device, direct-reduction temperature can be effectively improved, promote lead, zinc, silver, the volatilization of indium.Thus
Solve the problem that pelletizing easily melts, lead zinc-silver indium removal efficiency is low.
According to a particular embodiment of the invention, additive entrance 32 includes bentonite entrance and/or kieselguhr entrance.Thus
Bentonite and/or kieselguhr can be added in mixed-forming device as adding by bentonite entrance and/or kieselguhr entrance
Add agent.Inventor finds, is remarkably improved the fusing point of pelletizing, Jin Erfang by addition bentonite and kieselguhr in zinc leaching residue
Only pelletizing melts under the high temperature of direct-reduction.Bentonite may also operate as the effect of pellet binder simultaneously, strengthens ball
The fall strength of briquette of group is to more than 20 times.Thus can effectively prevent the pelletizing explosion efflorescence that in slag, the phase decomposition of ferrovanadium thing occurs.
According to a particular embodiment of the invention, by by permissible to addition bentonite and/or kieselguhr in zinc leaching residue granule
It is effectively improved the fusing point of pelletizing material.And then indirectly improve the temperature that direct-reduction processes, improve direct-reduction effect.Specifically
The temperature that direct-reduction processes can be 1200-1350 degree Celsius.At such a temperature, material pelletizing will not melt.Pelletizing
In lead, zinc, silver, indium can fully be volatilized.According to the concrete example of the present invention, by allocating in zinc leaching residue granule
Bentonite and/or kieselguhr, can significantly improve the fusing point of pelletizing.Preferably, the temperature that direct-reduction processes can be 1300-
1330 degrees Celsius, the time that direct-reduction processes is 20-50 minute.Control this condition and can ensure that pelletizing will not melt,
Direct reduction reactor efficiency can be improved to greatest extent so that lead, zinc, silver, indium can fully be volatilized simultaneously.
According to a particular embodiment of the invention, use the direct-reduction system of the zinc leaching residue of above-described embodiment, can realize
Lead, zinc, indium volatility are more than 98%, the silver volatility technical specification more than 95%.
Embodiment 1
(1) being dried by zinc leaching residue, after drying, in slag, Zn content is 4.34%, and lead content is 5.11%, and indium content is
380g/t, silver content is 270g/t, and iron content is 27%.Below 3mm it is crushed to after drying.The amount of allocating into of reduction coal is dry slag weight
The 27% of amount, adds kieselguhr 8%, bentonite 2%.(2) add water again after cadmia, reduction coal, bentonite, kieselguhr mixing
Mixing also carries out pressure ball through former, and measuring pelletizing fall strength of briquette is 6 times, can substantially meet rotary hearth furnace and enter stove intensity and want
Ask.(3) after molding, pelletizing is dried to moisture less than 4%, carries out reduction roasting in sending into direct-reduction rotary hearth furnace.Furnace reduction temperature
Degree is 1250 DEG C, and the recovery time is 50min.(4) after the roasting that step (3) obtains in metallized pellet in pelletizing Zn content be
0.23%, lead content is 0.44%, and indium content is 33g/t, and silver content is 89g/t, and pelletizing degree of metalization is 82%.It addition, also
In former rear metallized pellet, whole ball rate is 70%, and remaining is fragment or powdered granule.
Embodiment 2
(1) being dried by zinc leaching residue, after drying, in slag, Zn content is 4.34%, and lead content is 5.11%, and indium content is
380g/t, silver content is 270g/t, and iron content is 27%.Below 3mm it is crushed to after drying.The amount of allocating into of reduction coal is dry slag weight
The 27% of amount, adds kieselguhr 5%, bentonite 10%.(2) add water again after cadmia, reduction coal, bentonite, kieselguhr mixing
Secondary mixing also carries out pressure ball through former, and measuring pelletizing fall strength of briquette is more than 20 times, and pellet strength is high, can fully meet
Rotary hearth furnace enters stove requirement of strength.(3) after molding, pelletizing is dried to moisture less than 4%, carries out also in sending into direct-reduction rotary hearth furnace
Former roasting.Furnace reduction temperature is 1300 DEG C, and the recovery time is 42min.(4) metallized pellet after the roasting that step (3) obtains
In middle pelletizing, Zn content is 0.17%, and lead content is 0.15%, and indium content is 23g/t, and silver content is 12g/t, and pelletizing metallizes
Rate is 90%.It addition, in metallized pellet, whole ball rate is 95% after Hai Yuan, remaining is fragment or powdered granule.
Embodiment 3
(1) being dried by zinc leaching residue, after drying, in slag, Zn content is 4.34%, and lead content is 5.11%, and indium content is
380g/t, silver content is 270g/t, and iron content is 27%.Below 3mm it is crushed to after drying.The amount of allocating into of reduction coal is dry slag weight
The 27% of amount, adds kieselguhr 5%, bentonite 10%.(2) add water again after cadmia, reduction coal, bentonite, kieselguhr mixing
Secondary mixing also carries out pressure ball through former, and measuring pelletizing fall strength of briquette is more than 20 times, and pellet strength is high, can fully meet
Rotary hearth furnace enters stove requirement of strength.(3) after molding, pelletizing is dried to moisture less than 4%, carries out also in sending into direct-reduction rotary hearth furnace
Former roasting.Furnace reduction temperature is 1330 DEG C, and the recovery time is 37min.(4) metallized pellet after the roasting that step (3) obtains
In middle pelletizing, Zn content is 0.12%, and lead content is 0.11%, and < 10g/t, silver content is that < 10g/t, pelletizing metallizes to indium content
Rate is 92%.It addition, in metallized pellet, whole ball rate is 92% after Hai Yuan, remaining is fragment or powdered granule.
Embodiment 4
(1) being dried by zinc leaching residue, after drying, in slag, Zn content is 4.34%, and lead content is 5.11%, and indium content is
380g/t, silver content is 270g/t, and iron content is 37%.Below 3mm it is crushed to after drying.The amount of allocating into of reduction coal is dry slag weight
The 27% of amount, adds kieselguhr 5%, bentonite 10%.(2) add water again after cadmia, reduction coal, bentonite, kieselguhr mixing
Secondary mixing also carries out pressure ball through former, and measuring pelletizing fall strength of briquette is more than 20 times, and pellet strength is high, can fully meet
Rotary hearth furnace enters stove requirement of strength.(3) after molding, pelletizing is dried to moisture less than 4%, carries out also in sending into direct-reduction rotary hearth furnace
Former roasting.Furnace reduction temperature is 1330 DEG C, and the recovery time is 37min.(4) metallized pellet after the roasting that step (3) obtains
In middle pelletizing, Zn content is 0.15%, and lead content is 0.12%, and < 10g/t, silver content is that < 10g/t, pelletizing metallizes to indium content
Rate is 92%.It addition, in metallized pellet, whole ball rate is 85% after Hai Yuan, remaining is fragment or powdered granule.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing " etc.
Term should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be that machinery connects
Connect, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, in can being two elements
The connection in portion or the interaction relationship of two elements.For the ordinary skill in the art, can be according to concrete feelings
Condition understands above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score permissible
It is that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be arbitrary
Individual or multiple embodiment or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the technology of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be combined by personnel
And combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is example
Property, it is impossible to being interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, revises, replaces and modification.
Claims (9)
1. the direct reduction process of a zinc leaching residue, it is characterised in that including:
Zinc leaching residue is carried out drying and processing, in order to obtain being dried zinc leaching residue；
Described dry zinc leaching residue is carried out break process, in order to obtain zinc leaching residue granule；
Described zinc leaching residue granule and additive, reduction coal are carried out mixed-forming, in order to obtain pelletizing material；And
Described pelletizing material is carried out direct-reduction process in direct-reduction rotary hearth furnace, in order to obtain containing zinc, lead, silver and indium
Flue gas and metallized pellet.
The direct reduction process of zinc leaching residue the most according to claim 1, it is characterised in that described additive is bentonite
And/or kieselguhr.
The direct reduction process of zinc leaching residue the most according to claim 1 and 2, it is characterised in that adding of described additive
Enter 8-15 weight % that amount is described zinc leaching residue granule.
4. according to the direct reduction process of the zinc leaching residue described in any one of claim 1-3, it is characterised in that described directly also
The temperature of original place reason is 1200-1350 degree Celsius.
The direct reduction process of zinc leaching residue the most according to claim 4, it is characterised in that described direct-reduction processes
Temperature is 1300-1330 degree Celsius.
The direct reduction process of zinc leaching residue the most according to claim 5, it is characterised in that described direct-reduction processes
Time is 20-50 minute.
7. according to the direct reduction process of the zinc leaching residue described in any one of claim 1-6, it is characterised in that described reduction coal
10-40 weight % that addition is described zinc leaching residue granule.
8. being adapted for carrying out a system for the direct reduction process of zinc leaching residue described in any one of claim 1-7, its feature exists
In, described system includes:
Drying device, described drying device has zinc leaching residue entrance and the outlet of dry zinc leaching residue；
Breaker, described breaker has dry zinc leaching residue entrance and zinc leaching residue particle outlet, and described dry zinc soaks
Entrance of slagging tap is connected with the outlet of described dry zinc leaching residue；
Mixed-forming device, described mixed-forming device have zinc leaching residue particle entrance, additive entrance, reduction coal entrance and
Pelletizing material outlet, described zinc leaching residue particle entrance is connected with described zinc leaching residue particle outlet；
Direct-reduction rotary hearth furnace, described direct-reduction rotary hearth furnace has pelletizing material inlet, exhanst gas outlet and metallized pellet and goes out
Mouthful, described pelletizing material inlet is connected with described pelletizing material outlet.
The direct-reduction system of zinc leaching residue the most according to claim 8, it is characterised in that described additive entrance includes
Bentonite entrance and/or kieselguhr entrance.
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| CN201610623858.2A Pending CN106119529A (en) | 2016-08-01 | 2016-08-01 | The direct reduction process of zinc leaching residue and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106435205A (en) * | 2016-11-24 | 2017-02-22 | 江苏省冶金设计院有限公司 | System and method of treating zinc leaching residues |
| CN106929667A (en) * | 2017-03-13 | 2017-07-07 | 江苏省冶金设计院有限公司 | A kind of method for processing zinc leaching residue |
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| EP0508166A2 (en) * | 1991-04-12 | 1992-10-14 | Zia Metallurgical Processes, Inc. | Direct reduction process and apparatus |
| CN102776309A (en) * | 2012-07-19 | 2012-11-14 | 中冶南方工程技术有限公司 | Treatment method of zinc-bearing dust for steel works |
| CN105671328A (en) * | 2016-03-25 | 2016-06-15 | 江苏省冶金设计院有限公司 | Rotary hearth furnace and method for treating lead and zinc smelting slag |
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| EP0508166A2 (en) * | 1991-04-12 | 1992-10-14 | Zia Metallurgical Processes, Inc. | Direct reduction process and apparatus |
| CN102776309A (en) * | 2012-07-19 | 2012-11-14 | 中冶南方工程技术有限公司 | Treatment method of zinc-bearing dust for steel works |
| CN105671328A (en) * | 2016-03-25 | 2016-06-15 | 江苏省冶金设计院有限公司 | Rotary hearth furnace and method for treating lead and zinc smelting slag |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106435205A (en) * | 2016-11-24 | 2017-02-22 | 江苏省冶金设计院有限公司 | System and method of treating zinc leaching residues |
| CN106929667A (en) * | 2017-03-13 | 2017-07-07 | 江苏省冶金设计院有限公司 | A kind of method for processing zinc leaching residue |
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