CN105543490B - A kind of microwave calcining pretreatment ammonia process leaches the method that blast furnace dust prepares ZnO - Google Patents
A kind of microwave calcining pretreatment ammonia process leaches the method that blast furnace dust prepares ZnO Download PDFInfo
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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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
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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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/34—Obtaining zinc oxide
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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
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Abstract
The present invention relates to the method that a kind of microwave calcining pretreatment ammonia process leaching blast furnace dust prepares ZnO, belong to technical field of wet metallurgy.Microwave calcining pre-processes：The Na of blast furnace dust quality 5~20% is added first into blast furnace dust2CO3Mixed material is obtained after well mixed, being 200~600 DEG C in temperature by mixed material carries out 0.5~2h of microwave calcining, obtains calcining；The calcining ammoniacal liquor NH that total ammonia density is 3~6mol/L4HCO3Solution is stirred 0.5~1.0h of leaching at 25~45 DEG C, then carries out separation of solid and liquid, and solid slag obtains leachate and leached mud through the multiple carrying out washing treatment of 5% ammonia spirit；ZnO is prepared after last purified removal of impurities, ammonia still process crystallization, microwave calcination.The present invention can utilize Ferrous Metallurgy zinc smoke clean and effective, improve the recovery utilization rate high-quality ZnO products of low energy preparation simultaneously of secondary resource.
Description
Technical field
The present invention relates to the method that a kind of microwave calcining pretreatment-ammonia process leaching blast furnace dust prepares ZnO, belong to wet method
Technical field of smelting.
Background technology
In addition to zn Mineral resource, the slag dirt of metallurgy containing zinc is also the extremely important available resources in China, predominantly blast furnace smelting
Zinc-containing mash gas mud and gas ash, zinc smoke caused by arc melting process, after lead smelting slag volatilization are produced during refining
Zinc smoke and Zinc Hydrometallurgy Residue etc..China is the first in the world steel big producer, produces steel per year more than 500,000,000 tons.According to statistics, often
1 ton of steel of production produces 10~15kg blast furnace top gas mud containing Zns, annual about 500~7,000,000 tons of output gas ash, amount containing metallic zinc 50
More than ten thousand tons；Tissue is studied according to International Lead zinc（ILZSG）Statistics, world's electric arc furnaces in 2007（EAF）7,500,000 tons of cigarette ash, containing zinc
18~35%, about 1,500,000 tons of amount containing metallic zinc.With the increase of China's regeneration steel amount, gas mud amount will be drastically with zinc content
Increase；China in 2011 produces nearly 5,000,000 tons of metallic lead, and the clinker containing zinc about 10% in lead smelting process, clinker passes through fuming furnace
Volatilization obtains secondary zinc oxide cigarette ash, annual caused 600,000 tons of secondary zinc oxide cigarette ash.Zinc hydrometallurgy has occupied world's zinc metallurgy total amount
More than 80%, the process produces substantial amounts of zinc leaching residue, and these material containing zincs are iron content（Up to 14%）, calcium（Up to
19%）, chlorine（Up to 12%）, fluorine（Up to 2%）Etc. the secondary zinc oxide of plurality of impurities, zinc is mainly brilliant with zinc oxide, zinc-iron point
Stone and zinc silicate form are present, and ferro element mainly exists in the form of ferroso-ferric oxide and franklinite, and calcium constituent is mainly with carbon
The silicate patterns of sour calcium and iron content zinc calcium are present.Therefore, as zn Mineral resource, to effective profit of the non -traditional resources containing zinc
With mitigating environmental pressure, improve resource utilization the problem of being current urgent need to resolve.
At present, effective processing mode is zinc is entered solution by the way of zinc hydrometallurgy, further processing recovery
Valuable metal zinc.On the other hand, high-purity zinc oxide is widely used as a kind of indispensable high-tech raw material of modern industry,
With developing rapidly for economy, the utilization of high-purity zinc oxide is gradually increased, while the requirement to its quality improves constantly.
The method that steel plant smoke ash ammonia such as patent 201210358096.X applications produces high-purity zinc oxide, using 3 ~ 5%
White lime activating pretreatment 42h, then leaching agent is made using ammoniacal liquor-ammonium fluid, its zinc recovery 93.18%, adds substantial amounts of fluorine
Leached in the case of sodium metasilicate, surfactant SDS and dicyanodiamine using ball milling, 140 mesh materials are carried out with three sections of stirring leachings
Go out, each section of extraction time is 2h, and this method technological process is long, additive is complicated, soak time length（Patent 201210358074.3
Also it is such）, it is uneconomical, and the rate of recovery of zinc certainly will be reduced to the mesh material utilizations not yet in effect of ＜ 140.
Patent 00112249.5 discloses the method that ammoniacal liquor-carbon ammonium joint leaching complexing prepares high-purity active zinc oxide,
Using secondary zinc oxide as raw material, the effective content of its zinc oxide is more than 60%, belongs to high-grade zinc-bearing mineral, extraction temperature 50 ~ 80
DEG C, extraction temperature is higher, and the volatilization of ammonia is more serious；Its drying temperature is 120 ~ 180 DEG C, and water content is less than 2.5%, and it is dried
Temperature is high and efficiency is low, and water content is higher；In addition, its sintering temperature is 300 ~ 360 DEG C, roasting time is 6 ~ 8h, temperature compared with
High, time is longer certainly will to bring huge production cost.Patent 02113604.1,201310307733.5,
201210363489.X there is also the deficiency of this respect for 201310041731.6 methods announced.
Therefore, the problems existing for processing non -traditional resources containing zinc for more than, how effectively by low containing zinc, difficult leaching
Zinc in the blast furnace dust that ore removal phase is more, impurity content is complicated leaches, and obtains the high-purity zinc oxide of high-quality, simplifies simultaneously
Technological process, energy consumption is reduced, overcome the shortcomings of conventional method, turn into the technical problem of industry urgent need to resolve.
The content of the invention
The present invention is directed to Ferrous Metallurgy zinc smoke, using existing acidleach treatment technology and PROCESS FOR TREATMENT residues containing zinc dirt alkalescence
Gangue content is high, and low-grade zinc-containing mash gas ash resource utilization is low；Volatilizing and enriching method is used to be reclaimed in the form of zinc oxide
Metallic zinc, the problem of energy consumption is big, and environmental pollution is serious be present.Meanwhile existing ammonia process treatment process exist complex process, leach when
Between long, zinc leach incomplete, prepare the conventional drying of high-purity zinc oxide process, calcine technology temperature is high, processing time is long and efficiency
The shortcomings of low, high energy consumption, there is provided a kind of microwave calcining pretreatment-ammonia process leaches the method that blast furnace dust prepares ZnO, energy
Ferrous Metallurgy zinc smoke clean and effective is utilized, improves the recovery utilization rate while low energy preparation high-quality ZnO of secondary resource
Product.
A kind of microwave calcining pretreatment-ammonia process leaches the method that blast furnace dust prepares ZnO, and it is comprised the following steps that：
（1）Microwave calcining pre-processes：The Na of blast furnace dust quality 5~20% is added first into blast furnace dust2CO3It is mixed
Mixed material is obtained after closing uniformly, being 200~600 DEG C in temperature by mixed material carries out 0.5~2h of microwave calcining, is roasted
Sand；The purpose of roasting pretreatment is to realize refractory ore phase（ZnFe2O4And Zn2SiO4）Transformation to ZnO phases, it is main to occur such as
Lower reaction：
ZnFe2O4+Na2CO3=ZnO+Na2Fe2O4+CO2
ZnSi2O4+Na2CO3 =2ZnO+Na2Si2O4+ CO2；
（2）Leach：By step（1）The calcining the being prepared ammoniacal liquor that total ammonia density is 3~6mol/L（NH3·H2O）-
NH4HCO3Solution is stirred 0.5~1.0h of leaching at 25~45 DEG C, then carries out separation of solid and liquid, and solid slag is molten through 5% ammoniacal liquor
The multiple carrying out washing treatment of liquid, obtains leachate and leached mud；Wherein ammoniacal liquor-NH4HCO3[the NH of solution3]:[NH3]T=1:2, liquid-solid ratio
For 3 ~ 10：1ml/g, mixing speed are 150 ~ 350rpm；
（3）Purification and impurity removal：By step（2）Obtained leachate is firstly added zinc powder and removes Cu, Cd, Pb, Co foreign metal, so
KMnO is added under conditions of blowing air afterwards4Except Fe is purified liquid；
（4）Ammonia still process crystallizes：By step（3）Obtained scavenging solution is passed through progress ammonia still process processing, ammonia still process in ammonia distiller and handled
Afterwards, wash, be filtrated to get filter cake, dehydration product will be obtained after filtration cakes torrefaction；NH caused by the process3And step（1）Produce
CO2Ammonia absorber production carbon ammonium solvent is together passed through, this method not only realizes the recovery of ammonia simultaneously to CO caused by roasting2
Gas is used, and reduces CO2To the discharge capacity of air.Key reaction is as follows：
2NH3+H2O+CO2=(NH4)2CO3
(NH4)2CO3+H2O+CO2=2NH4HCO3
（5）Microwave calcination：By step（4）Microwave calcination 10 under the conditions of obtained dehydration product is 100~300 DEG C in temperature
~ 30min, is prepared ZnO.
The step（1）In blast furnace dust in total Zn content be 4 ~ 25wt%, 2 ~ 13wt% of ZnO content in total zinc,
ZnSiO41~6wt%、ZnFe2O40.7 ~ 5wt%, other 0.3 ~ 1wt% of zinc-bearing mineral.
The step（3）Middle purification and impurity removal process is：The dosage for adding zinc powder is that Cu, Cd, Pb, Co in leachate is complete
1~2.5 times of theoretical amount is cemented out, 0.5~1.5h is replaced under the conditions of being 60~80 DEG C in temperature；The flow of air is
100~300L/h, KMnO4Addition be completely by 0.5~2 times of the theoretical amounts cemented out of Fe in leachate, in temperature
For 0.5~1.0h of iron removaling under the conditions of 60~80 DEG C.
The step（4）Ammonia still process crystallization process be：It is 95~105 DEG C of 0.5~1.0h of ammonia still process in temperature.
The step（4）Drying process be：5~20min of microwave drying is carried out at 95~100 DEG C of temperature.
The beneficial effects of the invention are as follows：
（1）Microwave calcining pretreatment is carried out to blast furnace dust before leaching, realizes that hardly possible leaches ore deposit phase first（ZnFe2O4With
Zn2SiO4）To the easy transformation for leaching ZnO phases, leaching process effectively shortens extraction time and leaching while improving zinc leaching rate
Agent dosage, zinc leaching rate reach as high as 91.2%.
（2）This method not only realizes the recovery of ammonia simultaneously to CO caused by roasting2Gas is used, and reduces CO2It is right
The discharge capacity of air.
（3）Waste heat circulation drying process caused by calcination process, has saved energy consumption, in addition, the implementation of the technique, utilization are micro-
When the advantage of ripple clean energy resource, effectively shortening drying time and drying efficiency height, while reducing temperature and the calcining of calcining
Between, energy resource consumption is effectively saved, and calcination product ZnO purity is higher, up to more than 99.7%.
（4）The implementation of this method simplifies whole technological process while promotes the utilization of the non -traditional resources containing zinc, mitigates
Business burden.
Brief description of the drawings
Fig. 1 is present invention process flow chart.
Embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
Embodiment 1
As shown in figure 1, the microwave calcining pretreatment-ammonia process leaches the method that blast furnace dust prepares ZnO, its specific steps
It is as follows：
（1）Microwave calcining pre-processes：First to blast furnace dust（Total Zn content is in zinc-bearing mineral in blast furnace dust
25wt%, ZnO content 13wt%, ZnSiO in total zinc46wt%、ZnFe2O45wt%, other zinc-bearing minerals account for 1wt%）Middle addition blast furnace
The Na of gas ash quality 5%2CO3Mixed material is obtained after well mixed, being 200 DEG C in temperature by mixed material carries out microwave calcinings
2h, obtain calcining；The purpose of roasting pretreatment is to realize refractory ore phase（ZnFe2O4And Zn2SiO4）Transformation to ZnO phases, it is main
Occur to react as follows：
ZnFe2O4+Na2CO3=ZnO+Na2Fe2O4+CO2
ZnSi2O4+Na2CO3 =2ZnO+Na2Si2O4+ CO2；
（2）Leach：By step（1）The ammoniacal liquor that the calcining being prepared is 3mol/L with total ammonia density（NH3·H2O）-
NH4HCO3Solution is stirred at 45 DEG C leaches 1.0h, then carries out separation of solid and liquid, solid slag is multiple through 5wt% ammonia spirits
Carrying out washing treatment, obtain leachate and leached mud；Wherein ammoniacal liquor-NH4HCO3[the NH of solution3]:[NH3]T=1:2（The concentration of ammoniacal liquor is
1.5mol/L, NH4HCO3Concentration be 1.5mol/L）, liquid-solid ratio 3：1ml/g, mixing speed 150rpm；
（3）Purification and impurity removal：By step（2）Obtained leachate is firstly added zinc powder and removes Cu, Cd, Pb, Co foreign metal, so
KMnO is added under conditions of blowing air afterwards4Except Fe is purified liquid；Wherein purification and impurity removal process is：Add zinc powder dosage be
Cu, Cd, Pb, Co in leachate are cemented out 1 times of theoretical amount completely, 1.5h is replaced under the conditions of being 80 DEG C in temperature；It is empty
The flow of gas is 100L/h, KMnO4Addition be completely by 0.5 times of the theoretical amounts cemented out of Fe in leachate, in temperature
Spend for iron removaling 1.0h under the conditions of 80 DEG C；
（4）Ammonia still process crystallizes：By step（3）Obtained scavenging solution is passed through progress ammonia still process processing, ammonia still process in ammonia distiller and handled
Afterwards, wash, be filtrated to get filter cake, dehydration product will be obtained after filtration cakes torrefaction；NH caused by the process3And step（1）Produce
CO2Ammonia absorber production carbon ammonium solvent is together passed through, this method not only realizes the recovery of ammonia simultaneously to CO caused by roasting2
Gas is used, and reduces CO2To the discharge capacity of air, ammonia still process crystallization process is：It is 95 DEG C of ammonia still process 1.0h in temperature, dries
Process is：Microwave drying 5min is carried out at 95 DEG C of temperature.Key reaction is as follows：
2NH3+H2O+CO2=(NH4)2CO3
(NH4)2CO3+H2O+CO2=2NH4HCO3
（5）Microwave calcination：By step（4）Microwave calcination 30min under the conditions of obtained dehydration product is 100 DEG C in temperature,
ZnO is prepared.
Under the embodiment, up to 85.2%, the ZnO product purities after calcination processing reach the leaching rate through leaching process zinc
99.75%。
Embodiment 2
As shown in figure 1, the microwave calcining pretreatment-ammonia process leaches the method that blast furnace dust prepares ZnO, its specific steps
It is as follows：
（1）Microwave calcining pre-processes：First to blast furnace dust（Total Zn content is 4wt% in blast furnace dust, in total zinc
ZnO content 2wt%, ZnSiO41wt%, ZnFe2O40.7wt%, other zinc-bearing mineral 0.3wt）Middle addition blast furnace dust quality 10%
Na2CO3Mixed material is obtained after well mixed, being 400 DEG C in temperature by mixed material carries out microwave calcining 1h, obtains calcining；
The purpose of roasting pretreatment is to realize refractory ore phase（ZnFe2O4And Zn2SiO4）Transformation to ZnO phases, main generation are following anti-
Should：
ZnFe2O4+Na2CO3=ZnO+Na2Fe2O4+CO2
ZnSi2O4+Na2CO3 =2ZnO+Na2Si2O4+ CO2；
（2）Leach：By step（1）The ammoniacal liquor that the calcining being prepared is 4mol/L with total ammonia density（NH3·H2O）-
NH4HCO3Solution is stirred at 35 DEG C leaches 45min, then carries out separation of solid and liquid, solid slag is multiple through 5wt% ammonia spirits
Carrying out washing treatment, obtain leachate and leached mud；Wherein ammoniacal liquor-NH4HCO3[the NH of solution3]:[NH3]T=1:2（The concentration of ammoniacal liquor is
2mol/L, NH4HCO3Concentration be 2mol/L）, liquid-solid ratio 5：1ml/g, mixing speed 250rpm；
（3）Purification and impurity removal：By step（2）Obtained leachate is firstly added zinc powder and removes Cu, Cd, Pb, Co foreign metal, so
KMnO is added under conditions of blowing air afterwards4Except Fe is purified liquid；Wherein purification and impurity removal process is：Add zinc powder dosage be
Cu, Cd, Pb, Co in leachate are cemented out 1.5 times of theoretical amount completely, 1h is replaced under the conditions of being 70 DEG C in temperature；It is empty
The flow of gas is 200L/h, KMnO4Addition be completely by 1 times of the theoretical amounts cemented out of Fe in leachate, in temperature
For iron removaling 50min under the conditions of 75 DEG C；
（4）Ammonia still process crystallizes：By step（3）Obtained scavenging solution is passed through progress ammonia still process processing, ammonia still process in ammonia distiller and handled
Afterwards, wash, be filtrated to get filter cake, dehydration product will be obtained after filtration cakes torrefaction；NH caused by the process3And step（1）Produce
CO2Ammonia absorber production carbon ammonium solvent is together passed through, this method not only realizes the recovery of ammonia simultaneously to CO caused by roasting2
Gas is used, and reduces CO2To the discharge capacity of air, ammonia still process crystallization process is：It is 100 DEG C of ammonia still process 50min in temperature, does
Dry process is：Microwave drying 10min is carried out at 100 DEG C of temperature.Key reaction is as follows：
2NH3+H2O+CO2=(NH4)2CO3
(NH4)2CO3+H2O+CO2=2NH4HCO3
（5）Microwave calcination：By step（4）Microwave calcination 20min under the conditions of obtained dehydration product is 250 DEG C in temperature,
ZnO is prepared.
Under the embodiment, up to 90.07%, the ZnO product purities after calcination processing reach the leaching rate through leaching process zinc
99.85%。
Embodiment 3
As shown in figure 1, the microwave calcining pretreatment-ammonia process leaches the method that blast furnace dust prepares ZnO, its specific steps
It is as follows：
（1）Microwave calcining pre-processes：First to blast furnace dust（Total Zn content is 15wt% in blast furnace dust, in total zinc
ZnO content 7.73wt%, ZnSiO43.94wt%、ZnFe2O42.63wt%, other zinc-bearing minerals account for 0.7wt%）The middle high tile of addition
The Na of this grey quality 20%2CO3Mixed material is obtained after well mixed, being 600 DEG C in temperature by mixed material carries out microwave calcinings
0.5h, obtain calcining；The purpose of roasting pretreatment is to realize refractory ore phase（ZnFe2O4And Zn2SiO4）Transformation to ZnO phases,
It is main that following reaction occurs：
ZnFe2O4+Na2CO3=ZnO+Na2Fe2O4+CO2
ZnSi2O4+Na2CO3 =2ZnO+Na2Si2O4+ CO2；
（2）Leach：By step（1）The ammoniacal liquor that the calcining being prepared is 6mol/L with total ammonia density（NH3·H2O）-
NH4HCO3Solution is stirred at 25 DEG C leaches 0.5h, then carries out separation of solid and liquid, solid slag is multiple through 5wt% ammonia spirits
Carrying out washing treatment, obtain leachate and leached mud；Wherein ammoniacal liquor-NH4HCO3[the NH of solution3]:[NH3]T=1:2（The concentration of ammoniacal liquor is
3mol/L, NH4HCO3Concentration be 3mol/L）, liquid-solid ratio 10：1ml/g, mixing speed 350rpm；
（3）Purification and impurity removal：By step（2）Obtained leachate is firstly added zinc powder and removes Cu, Cd, Pb, Co foreign metal, so
KMnO is added under conditions of blowing air afterwards4Except Fe is purified liquid；Wherein purification and impurity removal process is：Add zinc powder dosage be
Cu, Cd, Pb, Co in leachate are cemented out 2.5 times of theoretical amount completely, 0.5h is replaced under the conditions of being 60 DEG C in temperature；
The flow of air is 300L/h, KMnO4Addition be completely by 2 times of the theoretical amounts cemented out of Fe in leachate, in temperature
Spend for iron removaling 0.5h under the conditions of 60 DEG C；
（4）Ammonia still process crystallizes：By step（3）Obtained scavenging solution is passed through progress ammonia still process processing, ammonia still process in ammonia distiller and handled
Afterwards, wash, be filtrated to get filter cake, dehydration product will be obtained after filtration cakes torrefaction；NH caused by the process3And step（1）Produce
CO2Ammonia absorber production carbon ammonium solvent is together passed through, this method not only realizes the recovery of ammonia simultaneously to CO caused by roasting2
Gas is used, and reduces CO2To the discharge capacity of air, ammonia still process crystallization process is：It is 105 DEG C of ammonia still process 0.5h in temperature, does
Dry process is：Microwave drying 20min is carried out at 98 DEG C of temperature.Key reaction is as follows：
2NH3+H2O+CO2=(NH4)2CO3
(NH4)2CO3+H2O+CO2=2NH4HCO3
（5）Microwave calcination：By step（4）Microwave calcination 10min under the conditions of obtained dehydration product is 300 DEG C in temperature,
ZnO is prepared.
Under the embodiment, up to 91.2%, the ZnO product purities after calcination processing reach the leaching rate through leaching process zinc
99.91%。
Above in association with accompanying drawing to the present invention embodiment be explained in detail, but the present invention be not limited to it is above-mentioned
Embodiment, can also be before present inventive concept not be departed from those of ordinary skill in the art's possessed knowledge
Put that various changes can be made.
Claims (5)
1. a kind of microwave calcining pretreatment-ammonia process leaches the method that blast furnace dust prepares ZnO, it is characterised in that specific steps are such as
Under：
（1）Microwave calcining pre-processes：The Na of blast furnace dust quality 5~20% is added first into blast furnace dust2CO3Mixing is equal
Mixed material is obtained after even, being 200~600 DEG C in temperature by mixed material carries out 0.5~2h of microwave calcining, obtains calcining；
（2）Leach：By step（1）The calcining the being prepared ammoniacal liquor-NH that total ammonia density is 3~6mol/L4HCO3Solution is 25
0.5~1.0h of leaching is stirred at~45 DEG C, then carries out separation of solid and liquid, solid slag is through the multiple washup of 5% ammonia spirit
Reason, obtains leachate and leached mud；Wherein ammoniacal liquor-NH4HCO3[the NH of solution3]:[NH3]T=1:2, liquid-solid ratio is 3 ~ 10：1ml/
G, mixing speed are 150 ~ 350 rpm；
（3）Purification and impurity removal：By step（2）Obtained leachate is firstly added zinc powder and removes Cu, Cd, Pb, Co foreign metal, Ran Hou
KMnO is added under conditions of blowing air4Except Fe is purified liquid；
（4）Ammonia still process crystallizes：By step（3）Obtained scavenging solution is passed through progress ammonia still process processing in ammonia distiller, after ammonia still process has been handled, washes
Wash, be filtrated to get filter cake, dehydration product will be obtained after filtration cakes torrefaction；
（5）Microwave calcination：By step（4）Microwave calcination 10 ~ 30 under the conditions of obtained dehydration product is 100~300 DEG C in temperature
Min, ZnO is prepared.
2. microwave calcining pretreatment according to claim 1-ammonia process leaches the method that blast furnace dust prepares ZnO, it is special
Sign is：The step（1）In blast furnace dust in total Zn content be 4 ~ 25wt%, 2 ~ 13wt% of ZnO content in total zinc,
ZnSiO41~6wt%、ZnFe2O40.7 ~ 5wt%, other 0.3 ~ 1wt% of zinc-bearing mineral.
3. microwave calcining pretreatment according to claim 1-ammonia process leaches the method that blast furnace dust prepares ZnO, it is special
Sign is：The step（3）Middle purification and impurity removal process is：The dosage for adding zinc powder is that Cu, Cd, Pb, Co in leachate is complete
1~2.5 times of theoretical amount is cemented out, 0.5~1.5h is replaced under the conditions of being 60~80 DEG C in temperature；The flow of air is
100~300L/h, KMnO4Addition be completely by 0.5~2 times of the theoretical amounts cemented out of Fe in leachate, in temperature
For 0.5~1.0h of iron removaling under the conditions of 60~80 DEG C.
4. microwave calcining pretreatment according to claim 1-ammonia process leaches the method that blast furnace dust prepares ZnO, it is special
Sign is：The step（4）Ammonia still process crystallization process be：It is 95~105 DEG C of h of ammonia still process 0.5~1.0 in temperature.
5. microwave calcining pretreatment according to claim 1-ammonia process leaches the method that blast furnace dust prepares ZnO, it is special
Sign is：The step（4）Drying process be：5~20min of microwave drying is carried out at 95~100 DEG C of temperature.
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| CN109097557B (en) * | 2018-08-03 | 2020-06-16 | 中南大学 | Method for recovering zinc from zinc silicate-containing zinc resources |
| CN109879323A (en) * | 2019-02-20 | 2019-06-14 | 武汉科技大学 | It is a kind of to prepare ferritic method using electric furnace dust and mill scale |
| CN109852811A (en) * | 2019-02-26 | 2019-06-07 | 武汉科技大学 | A kind of zinc-iron efficient separation method |
| CN111926196B (en) * | 2020-08-14 | 2022-04-19 | 六盘水师范学院 | Method for recovering zinc from smelting waste residues |
| CN113403480A (en) * | 2021-05-14 | 2021-09-17 | 东北大学 | Recovery method and application of high-alkali high-zinc blast furnace gas ash |
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