CN206986256U - A kind of system for handling utilising zinc containing waste residue - Google Patents
A kind of system for handling utilising zinc containing waste residue Download PDFInfo
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- CN206986256U CN206986256U CN201720795159.6U CN201720795159U CN206986256U CN 206986256 U CN206986256 U CN 206986256U CN 201720795159 U CN201720795159 U CN 201720795159U CN 206986256 U CN206986256 U CN 206986256U
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- zinc
- dehalogenation
- entrance
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- waste residue
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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
Abstract
The utility model provides a kind of system for handling utilising zinc containing waste residue.The system includes：Dehalogenation device, exported provided with utilising zinc containing waste residue entrance and dehalogenation material；Densifier, exported provided with dehalogenation material entrance, carbon containing material entrance and densification material, dehalogenation material entrance is connected with the dehalogenation material outlet of dehalogenation device；Reduction roasting device, provided with densification material entrance, zinc-containing dust outlet and the outlet of poor material, densification material entrance is connected with the densification material outlet of densifier.The utility model to utilising zinc containing waste residue by carrying out fluorine, chlorine removes process, can effectively reduce fluorine, the chlorinity in reduction roasting device, reduces body equipment and supporting preboiler, dust collecting system are etched.Also solve utilising zinc containing waste residue and reclaim obtained zinc-containing dust because fluorine, chlorinity are high, can not be used effectively, and the problem of the Zn-ef ficiency rate of recovery is low.
Description
Technical field
The utility model belongs to metallurgical technology field, in particular it relates to a kind of system for handling utilising zinc containing waste residue.
Background technology
During metal smelt, a certain amount of metallurgical dust sludge and metallurgical slag are often incidentally produced, such as steel works sintering, height
The waste residue containing zinc of dedusting ash caused by stove, electric furnace part, also the metal smelt process such as zinc, lead, copper.In these melting waste slags
Still containing substantial amounts of recyclable valuable metal, such as zinc, lead, iron.The recycling for strengthening such metallurgical slag is advantageous to carry
The high china natural resources rate of recovery, effectively smelting process is mainly reclaimed by thermal process at present.Such as in rotary kiln, fuming
Using coal-based direct reduction as general principle in stove or rotary hearth furnace, will be volatilized in melting waste slag after the reduction of the compound such as zinc, lead, then
Reclaimed by supporting dust collecting system, obtain zinc-containing dust.
It should be noted that in metallurgical slag in addition to containing elements such as useful lead, zinc, iron, the overwhelming majority contains one
The halogens such as a little fluorine, chlorine, these fluorides, chloride are also by being volatized into dust collecting system, not only severe corrosion equipment,
And fluorine chlorine in zinc-containing dust is caused seriously to be enriched with, wherein fluorine chlorinity can reach more than 1%, have impact on this kind of zinc-containing dust
Further purification utilizes.Existing wet method dechlorination process long flow path, acid consumption is big, and dechlorination efficiency is low, and easily cause oxide powder and zinc and
The loss of ferro element in metallurgical slag, lack efficient, the economic processing method to such utilising zinc containing waste residue.
Utility model content
Existing fluorine, dechlorination rate be low when the utility model aims to solve the problem that utilising zinc containing waste residue recycling in the prior art, equipment
Corrode the problems such as serious.
First, the utility model provides a kind of system for handling utilising zinc containing waste residue, and it includes：
Dehalogenation device, exported provided with utilising zinc containing waste residue entrance and dehalogenation material；
Densifier, exported provided with dehalogenation material entrance, carbon containing material entrance and densification material, the dehalogenation material entrance takes off with described
The dehalogenation material outlet of halogen device is connected；
Reduction roasting device, provided with densification material entrance, zinc-containing dust outlet and poor material outlet, the densification material entrance with
The densification material outlet of the densifier is connected.
Preferably, said system also includes：
Leaching device, exported provided with zinc-containing dust entrance, leaching agent entrance, containing zinc lixiviating solution outlet and leached mud, it is described
Zinc-containing dust entrance is connected with the zinc-containing dust outlet of the reduction roasting device；
Electrolysis carries zinc device, provided with entrance containing zinc lixiviating solution, zinc metal sheet outlet and waste liquid outlet, the entrance containing zinc lixiviating solution
It is connected with leaching device outlet containing zinc lixiviating solution.
The utility model to utilising zinc containing waste residue by carrying out fluorine, chlorine removes process, effectively can reduce in reduction roasting device
Fluorine, chlorinity, reduce body equipment and supporting preboiler, dust collecting system are etched.Utilising zinc containing waste residue is also solved to reclaim
The problem of zinc-containing dust arrived can not be used effectively because fluorine, chlorinity are high, and the Zn-ef ficiency rate of recovery is low.
Fluorine, chlorinity are seldom in zinc-containing dust made from the utility model, can be sent directly into wet-leaching technique and obtain
Available for the zinc leaching residue of electrolysis, the loss of quality oxide zinc is reduced.Moreover, by controlling moisture content in utilising zinc containing waste residue, sulphur to contain
Temperature, time, control climate condition when amount and fluorine, chlorine removing, fluorine, the removal efficiency of chlorine can reach more than 95% in raw material.
Additional aspect and advantage of the present utility model will be set forth in part in the description, partly by from following description
In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the system of processing utilising zinc containing waste residue in the utility model embodiment.
Embodiment
Below in conjunction with drawings and examples, specific embodiment of the present utility model is described in more details, with
Just the advantages of better understood when scheme of the present utility model and its various aspects.However, specific implementations described below
Mode and embodiment are for illustrative purposes only, rather than to limitation of the present utility model.
The utilising zinc containing waste residue that the utility model uses is a kind of or several in steel plant's dedusting ash, sludge, lead zinc-copper melting waste slag
The mixture of kind.Zinc, lead are typically contained in utilising zinc containing waste residue, the element separately containing the easily reduction volatilization such as micro indium, silver, germanium.
As shown in figure 1, the system of processing utilising zinc containing waste residue provided by the utility model includes：Dehalogenation device 1, densifier 2,
Reduction roasting device 3, leaching device 4 and electrolysis carry zinc device 5.
Dehalogenation device 1 is provided with utilising zinc containing waste residue entrance and dehalogenation material exports, and the fluorine, chlorine in utilising zinc containing waste residue are in the quilt of dehalogenation device 1
Removing.In the utility model preferred embodiment, dehalogenation device 1 can be Rotary Kiln or multiple hearth furnace.
Densifier 2 is provided with dehalogenation material entrance, carbon containing material entrance and the outlet of densification material, dehalogenation material entrance and dehalogenation device 1
Dehalogenation material outlet be connected.Dehalogenation material and carbon containing material mix in densifier 2, densification.
Reduction roasting device 3 is provided with densification material entrance, zinc-containing dust outlet and the outlet of poor material, densification material entrance and densification
The densification material outlet of device 2 is connected.Densification material is reduced in reduction roasting device 3, obtains zinc-containing dust and poor material.At this
In utility model preferred embodiment, reduction roasting device 3 can be rotary hearth furnace.
The utility model to utilising zinc containing waste residue by carrying out fluorine, chlorine removes process, effectively can reduce in reduction roasting device
Fluorine, chlorinity, reduce body equipment and supporting preboiler, dust collecting system are etched.Utilising zinc containing waste residue is also solved to reclaim
The problem of zinc-containing dust arrived can not be used effectively because fluorine, chlorinity are high, and the Zn-ef ficiency rate of recovery is low.
Leaching device 4 is provided with zinc-containing dust entrance, leaching agent entrance, containing zinc lixiviating solution outlet and leached mud outlet, containing zinc
Dust inlet is connected with the zinc-containing dust outlet of reduction roasting device 3.
Electrolysis carries zinc device 5 provided with entrance containing zinc lixiviating solution, zinc metal sheet outlet and waste liquid outlet, entrance containing zinc lixiviating solution and leaching
The outlet containing zinc lixiviating solution for going out device 4 is connected.
Leaching device 4 and electrolysis carry zinc device 5 and are used to reclaim the zinc in zinc-containing dust.Zincilate made from the utility model
Fluorine, chlorinity are seldom in dirt, can be sent directly into wet-leaching technique and obtain the zinc leaching residue available for electrolysis, reduce high-quality oxygen
Change the loss of zinc powder.It should be noted that obtained zinc-containing dust also can be otherwise utilized, or reclaimed using other equipment or method
Zinc powder.Leached mud can also separate the metals such as lead, indium, silver by other extract technologies.
Using the method for said system processing utilising zinc containing waste residue, comprise the following steps：
1) utilising zinc containing waste residue is sent into dehalogenation device 1, removes fluorine and chlorine in utilising zinc containing waste residue in an oxidizing atmosphere, obtain
Dehalogenation material；Utilising zinc containing waste residue also contains water and oxygen sulfur compound.
In an oxidizing atmosphere, volatiling reaction can occur in dehalogenation device 1 for the fluorine chlorine compound in utilising zinc containing waste residue, simultaneously
The fluorine chlorine for being difficult to remove in lattice also reacts with the hydrone in utilising zinc containing waste residue and oxygen sulfur compound, forms fluoride or chlorine
Compound is able to remove with flue gas.
Temperature, time, control climate condition when being removed by controlling moisture content in utilising zinc containing waste residue, sulfur content and fluorine, chlorine,
Fluorine, the removal efficiency of chlorine can reach more than 95% in raw material.
In an oxidizing atmosphere, the fluorine chlorine compound in utilising zinc containing waste residue is easier that volatiling reaction occurs, in the utility model
In preferred embodiment, in an oxidizing atmosphere, fluorine and chlorine in utilising zinc containing waste residue are removed, wherein, O in oxidizing atmosphere2Body
Product percentage composition >=20%, it is possible thereby to ensure there are enough O in reaction system2Defluorinate, chlorine are participated in oxygen sulfur compound
In reaction.
The temperature of removing fluorine and chlorine is too high or overlong time can cause zinc in utilising zinc containing waste residue, lead oxides volatilization loss；Temperature
Spend that the low or time is too short, be unfavorable in utilising zinc containing waste residue the removing of the crystallization water and high price sulfureous phase (such as ferric subsulfate etc.)
Decompose, so as to be difficult to ensure that the removing of fluorine, chlorine.It it is 650 DEG C (Celsius in temperature in the utility model preferred embodiment
Degree) -800 DEG C, the time be 2h (hour) -5h under conditions of remove the fluorine and chlorine of the utilising zinc containing waste residue.It is furthermore preferred that removing fluorine and
The temperature of chlorine is 700 DEG C -750 DEG C, and the removing time is 2h-3h.
Certain water and oxygen sulfur compound must be contained in utilising zinc containing waste residue, the content of water and oxygen sulfur compound is by utilising zinc containing waste residue
Depending on the content of middle chloride.In general, the weight/mass percentage composition of zinc is about 1%- in the utilising zinc containing waste residue come out from steel plant
20%, now, the weight/mass percentage composition of utilising zinc containing waste residue reclaimed water is preferably 1%-30%, and the weight/mass percentage composition of sulphur is preferably
0.3%-10%.It is highly preferred that the weight/mass percentage composition of utilising zinc containing waste residue reclaimed water is preferably 3%-10%, the weight/mass percentage composition of sulphur
Preferably 2%-5%.Thus it can ensure there is enough moisture and sulphur to be reacted with chloride, generation gaseous state lead chloride, chlorination
Zinc etc., at high temperature volatilization removing.
2) dehalogenation material and carbon containing material are sent into densifier 2 and mixed and densification, obtain densification material.
Carbon containing material is the reducing agent containing carbon, for the reductive dehalogenation material in follow-up reduction volatilization step.In this practicality
In new preferred embodiment, carbon containing material is one or more of mixtures in bituminous coal, anthracite, coke powder or charcoal.More
Preferably, carbon containing material is coke powder or charcoal, and fluorine chlorinity is low in coke powder and biomass carbon, can reduce fluorine chlorine in zinc-containing dust and contain
Amount, further reduce the erosion to equipment.
The dosage of carbon containing material according to need to be reduced in dehalogenation material iron, lead, zinc compound amount depending on, the too low nothing of dosage
Method fully reduces material to be restored in dehalogenation material, the cost of the too high increase reducing agent of materials, and easily causes block pressure
The efflorescence of close material.In the utility model preferred embodiment, the mass ratio of dehalogenation material and carbon containing material is 100：(5-25).
3) densification material is sent into reduction roasting device 3 and carries out reduction volatilization, obtain poor material and zinc-containing dust.
It is to be restored during (process that i.e. reduction reaction and volatile material are volatized into flue) is reacted in reduction volatilization
Block densification material in carbon and zinc, lead compound reduction reaction generation lead, zinc metal occurs, lead, zinc metal are waved at high temperature
Hair becomes steam, and steam obtains high-quality zinc-containing dust in the flue of reduction roasting device 3 by re-oxidation.
Temperature when reduction volatilization is reacted is higher or the time is longer, and reduction volatilization reaction carries out more thorough, but temperature mistake
High or overlong time meeting wasted heat, and material melting can be caused.In the utility model preferred embodiment, densification material exists
Reduction volatilization is carried out under conditions of temperature is 1100 DEG C -1300 DEG C, the time is 30min (minute) -60min.
In the utility model preferred embodiment, when the weight/mass percentage composition of utilising zinc containing waste residue reclaimed water is 1%-30%, zinc
Weight/mass percentage composition be 1%-20%, the weight/mass percentage composition of sulphur is when being 0.3%-10%, by control 1), 2), 3) step
Other conditions, the weight/mass percentage composition that can make zinc in obtained zinc-containing dust is 40%-65%, and fluorine, the quality percentage of chlorine contain
Amount is ≤0.015%.
4) by zinc-containing dust sulfuric acid leaching, obtain containing zinc lixiviating solution and leached mud.
5) leachate electrolysis is carried into zinc, obtains zinc powder and waste liquid.
Because the content of fluorine in obtained zinc-containing dust, chlorine is few, and the content of zinc is high, therefore can directly send to wet-leaching work
Skill, leached using sulfuric acid, then electrolysis carries zinc.Certainly, zinc-containing dust can be otherwise utilized as previously described, or uses other works
Skill carries out carrying zinc.Equally, leached mud can also separate the metals such as lead, indium, silver by other extract technologies as previously described.
Below with reference to specific embodiment, the utility model is illustrated.Institute's taking technique condition value in following embodiments
It is exemplary, its desirable number range is as shown in foregoing utility model content, for especially not dated technological parameter,
It can refer to routine techniques progress.Detection method used in following embodiments is the conventional detection method of the industry.
Embodiment 1
The present embodiment is as follows using the system processing utilising zinc containing waste residue shown in Fig. 1, idiographic flow：
11) by iron vitriol slag (aqueous 3wt% (weight/mass percentage composition), Zn content 5.2wt%, lead content are
3.3wt%, chlorinity 0.2wt%, sulfur content 10wt%) it is sent into Rotary Kiln (dehalogenation device 1).Temperature in kiln is
720 DEG C, material residence time in kiln is 4h, while blasts air.Fluorine chlorinity is in the dehalogenation material obtained after removing chlorine
0.005wt%, removal efficiency reach 98%.
12) dehalogenation material is sent into densifier 2 after cooling, and is incorporated the coke powder of dehalogenation material quality 18%, by mixing,
Densification material is made after densification.
13) densification material is sent into rotary hearth furnace (reduction roasting device 3), in-furnace temperature is controlled at 1100 DEG C -1200 DEG C, instead
Answer 40min, lead, zinc sulfate are further broken into lead oxide, zinc oxide in ferrovanadium slag, and oxide is reduced to simple substance zinc, list
Matter lead, is oxidized to lead oxide and zinc oxide again in flue, obtains zinc-containing dust by dust collecting system, zinc in zinc-containing dust
Content is 47wt%, lead content 23wt%, and fluorine chlorinity is respectively less than 0.01wt% in dust.Surplus materials in rotary hearth furnace is
Poor material.Poor material is discharged out of the furnace by the drawing mechanism of rotary hearth furnace.
14) zinc-containing dust is sent into leaching device 4, obtains containing zinc lixiviating solution and leached mud after sulfuric acid leaching.
15) leachate feeding electrolysis is carried in zinc device 5 and carries zinc for electrolysis, obtain zinc metal sheet.
Embodiment 2
The present embodiment is as follows using the system processing utilising zinc containing waste residue shown in Fig. 1, idiographic flow：
21) by steel plant's dirt mud (water content 30wt%, Zn content 1.5wt%, lead content 0.2wt%, chlorinity
For 0.5wt%, sulfur content 0.3wt%) it is sent into multiple hearth furnace (dehalogenation device 1).Temperature in stove is 650 DEG C, and material is in stove
Interior residence time is 2h, while blasts air.Fluorine chlorinity is 0.01wt% in obtained dehalogenation material after removing chlorine, removal efficiency
Reach more than 94%.
22) dehalogenation material is sent into densifier 2 after cooling, and is incorporated the coke powder of dehalogenation material quality 5%, by mixing,
Densification material is made after densification.
23) densification material is sent into rotary hearth furnace (reduction roasting device 3), in-furnace temperature is controlled at 1200 DEG C -1300 DEG C, instead
Answer 20min, lead, zinc sulfate are further broken into lead oxide, zinc oxide in steel plant's dirt mud, and oxide is reduced to simple substance
Zinc, elementary lead, are oxidized to lead oxide and zinc oxide again in flue, and zinc-containing dust, zincilate are obtained by dust collecting system
Zn content is 42wt% in dirt, lead content 8wt%, and fluorine chlorinity is respectively less than 0.015wt% in dust.Residue in rotary hearth furnace
Material is poor material.Poor material is discharged out of the furnace by the drawing mechanism of rotary hearth furnace.
24) zinc-containing dust is sent into leaching device 4, obtains containing zinc lixiviating solution and leached mud after sulfuric acid leaching.
25) leachate feeding electrolysis is carried in zinc device 5 and carries zinc for electrolysis, obtain zinc metal sheet.
Embodiment 3
The present embodiment is as follows using the system processing utilising zinc containing waste residue shown in Fig. 1, idiographic flow：
31) by conventional zinc leaching residue (water content 10wt%, Zn content 17.2wt%, lead content 3.6wt%, chlorine
Content is 0.15wt%, sulfur content 4wt%) it is sent into multiple hearth furnace (dehalogenation device 1).Temperature in stove is 650 DEG C, and material exists
Residence time is 2h in stove, while blasts air.Fluorine chlorinity is 0.01wt% in the dehalogenation material obtained after removing chlorine, removing
Rate reaches more than 90%.
32) dehalogenation material is sent into densifier 2 after cooling, and is incorporated the coke powder of dehalogenation material quality 25%, by mixing,
Densification material is made after densification.
33) densification material is sent into rotary hearth furnace (reduction roasting device 3), in-furnace temperature is controlled at 1150 DEG C -1250 DEG C, instead
Answer 35min, lead, zinc sulfate are further broken into lead oxide, zinc oxide in conventional zinc leaching residue, and oxide is reduced to simple substance
Zinc, elementary lead, are oxidized to lead oxide and zinc oxide again in flue, and zinc-containing dust, zincilate are obtained by dust collecting system
Zn content is 62wt% in dirt, lead content 12wt%, and fluorine chlorinity is respectively less than 0.015wt% in dust.It is surplus in rotary hearth furnace
Excess matter is poor material.Poor material is discharged out of the furnace by the drawing mechanism of rotary hearth furnace.
34) zinc-containing dust is sent into leaching device 4, obtains containing zinc lixiviating solution and leached mud after sulfuric acid leaching.
35) leachate feeding electrolysis is carried in zinc device 5 and carries zinc for electrolysis, obtain zinc metal sheet.
Embodiment 4
The present embodiment is as follows using the system process processing utilising zinc containing waste residue shown in Fig. 1, idiographic flow：
41) by steel plant's dirt mud (water content 30wt%, Zn content 1.5wt%, lead content 0.2wt%, chlorinity
For 0.5wt%, sulfur content 0.3wt%) it is sent into multiple hearth furnace (dehalogenation device 1).Temperature in stove is 800 DEG C, and material is in stove
Interior residence time is 2h, while blasts air.Fluorine chlorinity is less than 0.008wt% in the dehalogenation material obtained after de- fluorine and chlorine removal,
Removal efficiency reaches more than 95%.
42) dehalogenation material is sent into densifier 2 after cooling, and is incorporated the coke powder of dehalogenation material quality 5%, by mixing,
Densification material is made after densification.
43) densification material is sent into rotary hearth furnace (reduction roasting device 3), in-furnace temperature is controlled at 1200 DEG C -1300 DEG C, instead
Answer 20min, lead, zinc sulfate are further broken into lead oxide, zinc oxide in steel plant's dirt mud, and oxide is reduced to simple substance
Zinc, elementary lead, are oxidized to lead oxide and zinc oxide again in flue, and zinc-containing dust, zincilate are obtained by dust collecting system
Zn content is 42wt% in dirt, lead content 8wt%, and fluorine chlorinity is respectively less than 0.015wt% in dust.Residue in rotary hearth furnace
Material is poor material, and poor material is discharged out of the furnace by the drawing mechanism of rotary hearth furnace.
44) zinc-containing dust is sent into leaching device 4, obtains containing zinc lixiviating solution and leached mud after sulfuric acid leaching.
45) leachate feeding electrolysis is carried in zinc device 5 and carries zinc for electrolysis, obtain zinc metal sheet.
It was found from above-described embodiment, the utility model to utilising zinc containing waste residue by carrying out fluorine, chlorine removes process, can effectively reduce
Fluorine, chlorinity in reduction roasting device, reduce body equipment and supporting preboiler, dust collecting system are etched.Also solve
The zinc-containing dust that utilising zinc containing waste residue reclaims to obtain can not be used effectively because fluorine, chlorinity are high, and the Zn-ef ficiency rate of recovery is low asks
Topic.
Obviously, above-described embodiment is only intended to clearly illustrate the utility model example, and not to embodiment party
The restriction of formula.For those of ordinary skill in the field, other differences can also be made on the basis of the above description
The change or variation of form.There is no necessity and possibility to exhaust all the enbodiments.And thus amplify out aobvious and
Among the change or variation being clear to are still in the scope of protection of the utility model.
Claims (2)
- A kind of 1. system for handling utilising zinc containing waste residue, it is characterised in that including：Dehalogenation device, exported provided with utilising zinc containing waste residue entrance and dehalogenation material；Densifier, exported provided with dehalogenation material entrance, carbon containing material entrance and densification material, the dehalogenation material entrance fills with the dehalogenation The dehalogenation material outlet put is connected；Reduction roasting device, provided with densification material entrance, zinc-containing dust outlet and poor material outlet, the densification material entrance with it is described The densification material outlet of densifier is connected.
- 2. system according to claim 1, it is characterised in that also include：Leaching device, exported provided with zinc-containing dust entrance, leaching agent entrance, containing zinc lixiviating solution outlet and leached mud, it is described to contain zinc Dust inlet is connected with the zinc-containing dust outlet of the reduction roasting device；Electrolysis carries zinc device, provided with entrance containing zinc lixiviating solution, zinc metal sheet outlet and waste liquid outlet, the entrance containing zinc lixiviating solution and institute The outlet containing zinc lixiviating solution for stating leaching device is connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720795159.6U CN206986256U (en) | 2017-07-03 | 2017-07-03 | A kind of system for handling utilising zinc containing waste residue |
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| CN201720795159.6U CN206986256U (en) | 2017-07-03 | 2017-07-03 | A kind of system for handling utilising zinc containing waste residue |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326189A (en) * | 2017-07-03 | 2017-11-07 | 江苏省冶金设计院有限公司 | A kind of system and method for handling utilising zinc containing waste residue |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326189A (en) * | 2017-07-03 | 2017-11-07 | 江苏省冶金设计院有限公司 | A kind of system and method for handling utilising zinc containing waste residue |
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