CN107099672B - The recovery method of the fume from steel making containing zinc - Google Patents

The recovery method of the fume from steel making containing zinc Download PDF

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CN107099672B
CN107099672B CN201710344507.2A CN201710344507A CN107099672B CN 107099672 B CN107099672 B CN 107099672B CN 201710344507 A CN201710344507 A CN 201710344507A CN 107099672 B CN107099672 B CN 107099672B
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zinc
scum
iron
recovery method
sulphur removal
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CN107099672A (en
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孙宁磊
殷书岩
申美玲
李明川
周永亮
彭建华
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China ENFI Engineering Corp
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China ENFI Engineering Corp
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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
    • C22B7/02—Working-up flue dust
    • 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
    • C22B19/22—Obtaining zinc otherwise than by distilling with leaching with acids
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • C22B7/007—Wet processes by acid leaching
    • 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)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention provides a kind of recovery methods of fume from steel making containing zinc.Method includes the following steps: will contain zinc fume from steel making carries out acidleach, scum and zinc-containing solution are obtained；Sulphur removal is carried out to scum using alkaline sulfur elimination, obtains iron extract mine producation.In above-mentioned recovery method, by step of acid dipping can by fume from steel making containing zinc zinc and iron separate, obtain scum and zinc-containing solution.Since the sulphur in scum is existed in the form of subsulfate, the present invention carries out sulphur removal to scum using alkaline sulfur elimination, subsulfate can be made effectively to decompose, so as to significantly improve the sulfur limitation effect of scum.Scum after sulphur removal can be directly as iron extract mine producation.In short, solving the problems, such as that existing scum sulfur content is high when handling fume from steel making containing zinc using the acid-hatching of young eggs, can more effectively recycle the ferro element in fume from steel making containing zinc using above-mentioned recovery method provided by the invention.

Description

The recovery method of the fume from steel making containing zinc
Technical field
The present invention relates to metallurgical technology fields, in particular to a kind of recovery method of fume from steel making containing zinc.
Background technique
A large amount of flue dust and clinker, especially flue dust would generally be generated in steelmaking process.On the one hand, these flue dust pair Environment is harmful, and its processing cost is high.On the other hand, a large amount of Zn-ef ficiency and ferro element are contained in flue dust, directly abandons meeting It results in waste of resources.Therefore, how by flue dust zinc and iron effectively recycled, be technical staff it is expected always solve ask Topic.
At present in the processing method of the fume from steel making containing zinc, more using the acid-hatching of young eggs, the acidleach passed through to flue dust will Zinc and iron separate, and obtain scum and zinc-containing solution, to further recycle zinc and iron.However, in the scum of method production Sulfur content is higher, and obtained scum can not cause these iron to be unable to get and effectively recycle directly as iron extract mine producation.
Summary of the invention
The main purpose of the present invention is to provide a kind of recovery methods of fume from steel making containing zinc, to solve to adopt in the prior art Existing scum sulfur content high problem when handling fume from steel making containing zinc with the acid-hatching of young eggs.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of recycling side of the fume from steel making containing zinc Method comprising following steps: zinc fume from steel making will be contained and carry out acidleach, obtain scum and zinc-containing solution；Using alkaline sulfur elimination pair Scum carries out sulphur removal, obtains iron extract mine producation.
Further, acidleach is carried out to fume from steel making containing zinc using sulfuric acid；Preferably, the concentration of sulfuric acid is 20~200g/ L。
Further, alkaline sulfur elimination be one of sodium hydroxide solution, potassium hydroxide solution, ammonium hydroxide and hydrazine hydrate or It is a variety of, and the concentration of alkaline sulfur elimination is 20~40g/L；Preferably, the weight during sulphur removal, between alkaline sulfur elimination and scum Amount is than being 0.1~10:1；Preferably, during sulphur removal, the temperature for controlling reaction system is 30~95 DEG C, the reaction time 0.5 ~3h.
Further, recovery method further includes the step of zinc-containing solution to be carried out to heavy zinc processing, obtains zinc salt product；It is preferred that The precipitating reagent used in the step of ground, heavy zinc processing is sodium hydroxide, sodium carbonate, ammonium bicarbonate, ammonium hydrogen carbonate, milk of lime and vulcanized sodium One of or it is a variety of；It is highly preferred that the molar ratio of zinc ion is 1~10:1 in precipitating reagent and zinc-containing solution.
Further, before the step of zinc-containing solution being carried out heavy zinc processing, recovery method further include to zinc-containing solution into The step of row is except iron.
Further, except the step of iron includes: iron removing reagent to be added into zinc-containing solution, while being passed through sky into zinc-containing solution Gas or oxygen after reaction, are obtained except the zinc-containing solution after iron；Preferably, except iron the pH value that zinc-containing solution is controlled in the step of is small In equal to 5.
Further, the iron removing reagent used in iron removal is in zinc oxide, zinc carbonate, calcium hydroxide and sodium hydroxide It is one or more.
Further, the extraction temperature during acidleach is 30~95 DEG C, and solvent and solute weight ratio is 2~5:1, and extraction time is 1~4h；It is preferred that the heavy zinc temperature in heavy zinc treatment process is 30~60 DEG C, the zinc time is sunk for 0.5~3h.
Further, before the step of carrying out sulphur removal to scum, recovery method further includes carrying out first time washing to scum The step of；Preferably, the solvent and solute weight ratio in first time washing step is 1~3:1；It is highly preferred that by first time washing step The diafiltration liquid of middle generation, which adds in zinc-containing solution, carries out heavy zinc processing.
Further, after the step of carrying out sulphur removal to scum, recovery method further includes carrying out the to the scum after sulphur removal The step of secondary washing；Preferably, the solvent and solute weight ratio in second of washing step is 1~3:1.
It applies the technical scheme of the present invention, the recovery method of the fume from steel making containing zinc will be the following steps are included: will contain zinc steel-making cigarette Dirt carries out acidleach, obtains scum and zinc-containing solution；Sulphur removal is carried out to scum using alkaline sulfur elimination, obtains iron extract mine producation.
In above-mentioned recovery method, by step of acid dipping can by fume from steel making containing zinc zinc and iron separate, obtain Scum and zinc-containing solution.Since the sulphur in scum is existed in the form of subsulfate, the present invention is using alkaline sulphur removal Agent carries out sulphur removal to scum, subsulfate can be made effectively to decompose, so as to significantly improve the sulfur limitation effect of scum.Sulphur removal Scum afterwards can be directly as iron extract mine producation.In short, solving using above-mentioned recovery method provided by the invention using acid Existing scum sulfur content high problem when leaching method handles fume from steel making containing zinc, can more effectively recycle in fume from steel making containing zinc Ferro element.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.Below in conjunction with embodiment, the present invention will be described in detail.
The application is described in further detail below in conjunction with specific embodiment, these embodiments should not be understood as limitation originally Apply for range claimed.
As described in background technology part, there are iron when using the acid-hatching of young eggs to handle fume from steel making containing zinc in the prior art The high problem of slag sulfur content.
In order to solve this problem, the present invention provides a kind of recovery methods of fume from steel making containing zinc comprising following step It is rapid: zinc fume from steel making will be contained and carry out acidleach, obtain scum and zinc-containing solution；Sulphur removal is carried out to scum using alkaline sulfur elimination, is obtained To iron extract mine producation.
In above-mentioned recovery method, by step of acid dipping can by fume from steel making containing zinc zinc and iron separate, obtain Scum and zinc-containing solution.Since the sulphur in scum is existed in the form of subsulfate, the present invention is using alkaline sulphur removal Agent carries out sulphur removal to scum, subsulfate can be made effectively to decompose, so as to significantly improve the sulfur limitation effect of scum.Sulphur removal Scum afterwards can be directly as iron extract mine producation.In short, solving using above-mentioned recovery method provided by the invention using acid Existing scum sulfur content high problem when leaching method handles fume from steel making containing zinc, can more effectively recycle in fume from steel making containing zinc Ferro element.
It is preferred that the present invention is containing of generating in converter, electric furnace, oxygen decarburization converter for the fume from steel making containing zinc of processing Zinc fume from steel making.
The technique that above-mentioned acidleach process can usually be used using this field.In a preferred embodiment, it uses Sulfuric acid carries out acidleach to fume from steel making containing zinc；Preferably, the concentration of sulfuric acid is 20~200g/L.Using the sulfuric acid under the concentration into The leaching efficiency of row acidleach, zinc is higher.
The subsulfate in scum can be made to be easier to decompose using alkaline sulfur elimination during above-mentioned sulphur removal.In one kind In preferred embodiment, alkaline sulfur elimination includes but is not limited to sodium hydroxide solution, potassium hydroxide solution, ammonium hydroxide and hydrazine hydrate One of or it is a variety of, and the concentration of alkaline sulfur elimination is 20~40g/L.These sulfur eliminations have better sulfur limitation effect.It is excellent Selection of land, during sulphur removal, the weight ratio between alkaline sulfur elimination and scum is 10~100:1.；Preferably, during sulphur removal, control The temperature of reaction system processed is 30~95 DEG C, and the reaction time is 0.5~3h.
After obtaining zinc-containing solution, zinc-containing solution is preferably subjected to heavy zinc processing, obtains zinc salt product.This can further be returned Receive Zn-ef ficiency.Zn-ef ficiency is to exist in the form of an ion, while there is also some impurity ions in zinc-containing solution.A kind of preferred Embodiment in, the step of heavy zinc processing in the precipitating reagent that uses for sodium hydroxide, sodium carbonate, ammonium bicarbonate, ammonium hydrogen carbonate, lime One of cream and vulcanized sodium are a variety of.Zinc ion can be more fully precipitated out by these precipitating reagents, while can be as far as possible Avoid settling out for other impurities ion.It is highly preferred that the molar ratio of precipitating reagent and zinc ion in zinc-containing solution is that 1~10:1 is having During gymnastics is made, the feed way of precipitating reagent and zinc-containing solution be can be to adding, and be also possible to a kind of be added into another kind. And the addition form of precipitating reagent can be and directly solid precipitating reagent is added, and more preferably be added in the form of the saturated solution of precipitating reagent Add.
, while can be containing a small amount of foreign ion in obtained zinc-containing solution in step of acid dipping, wherein iron ion is most main The foreign ion wanted.In a preferred embodiment, before the step of zinc-containing solution being carried out heavy zinc processing, recovery method Further include the steps that carrying out zinc-containing solution except iron.The purity of zinc salt product can be further increased in this way.
In a preferred embodiment, except the step of iron includes: that iron removing reagent is added into zinc-containing solution, while to containing It is passed through air or oxygen in zinc solution, after reaction, obtains except the zinc-containing solution after iron.Using aforesaid way can by ferrous iron from Son is converted into ferric iron precipitating, to achieve the purpose that except iron.It is highly preferred that controlling the pH value of zinc-containing solution in the step of removing iron Less than or equal to 5.Iron removal is carried out under such pH environment, better effect can guarantee zinc during sufficiently removing iron Almost without loss.
In a preferred embodiment, the iron removing reagent used in above-mentioned iron removal is zinc oxide, zinc carbonate, hydrogen-oxygen Change one of calcium and sodium hydroxide or a variety of.These iron removing reagents have better de-ferrous effect.It is preferred that using zinc oxide and carbon As iron removing reagent, this can be avoided introducing other impurities ion into zinc-containing solution sour zinc while sufficiently removing iron.
The process conditions such as the temperature used in above steps can be adjusted.In a preferred embodiment, Extraction temperature during above-mentioned acidleach is 30~95 DEG C, and solvent and solute weight ratio is 2~5:1, and extraction time is 1~4h；It is preferred that heavy Heavy zinc temperature in zinc treatment process is 30~60 DEG C, sinks the zinc time for 0.5~3h.Under the process conditions, the leaching of acidleach process More efficient out, better effect is precipitated in the zinc of heavy zinc process.
In a preferred embodiment, before the step of carrying out sulphur removal to scum, recovery method further includes to scum Carry out the step of washing for the first time.This soluble impurity for being conducive to carry in scum cleans.Preferably, it washes for the first time Washing the solvent and solute weight ratio in step is 1~3:1；It is highly preferred that adding to the diafiltration liquid generated in first time washing step containing zinc Heavy zinc processing is carried out in solution.Contain a small amount of zinc ion in filtrate after cleaning, returning it into zinc-containing solution can further mention High resource recovery.
In a preferred embodiment, after the step of carrying out sulphur removal to scum, recovery method further includes to sulphur removal Scum afterwards carries out the step of second of washing；Preferably, the solvent and solute weight ratio in second of washing step is 1~3:1.This energy The soluble impurity ion carried in scum after enough further cleaning sulphur removal.
Beneficial effects of the present invention are further illustrated by the following examples:
Embodiment 1
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 100g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 3:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 20g/L；Reaction temperature: 90 DEG C；Reaction time: 1 hour； Sulphur removal solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 70%；Iron ore concentrate iron content 60%, sulfur content 0.2%.
Embodiment 2
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 100g/L；Reaction temperature: 95 DEG C；Reaction time: 1 hour；Leach solvent and solute weight ratio: 5:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 20g/L；Reaction temperature: 90 DEG C；Reaction time: 1 hour； Sulphur removal solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 67%；Iron ore concentrate iron content 59%, sulfur content 0.25%.
Embodiment 3
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 100g/L；Reaction temperature: 30 DEG C；Reaction time: 4 hours；Leach solvent and solute weight ratio: 2:1；Solvent and solute weight ratio: 1:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 20g/L；Reaction temperature: 90 DEG C；Reaction time: 1 hour； Sulphur removal solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 65%；Iron ore concentrate iron content 56%, sulfur content 0.32%.
Embodiment 4
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 100g/L；Reaction temperature: 25 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 1.5:1；Solvent and solute weight ratio: 0.5:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 20g/L；Reaction temperature: 90 DEG C；Reaction time: 1 hour； Sulphur removal solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 60%；Iron ore concentrate iron content 50%, sulfur content 0.5%.
Embodiment 5
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 200g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 3:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 20g/L；Reaction temperature: 90 DEG C；Reaction time: 1 hour； Sulphur removal solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 74%；Iron ore concentrate iron content 62%, sulfur content 0.2%.
Embodiment 6
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 20g/L；Reaction temperature: 80 DEG C；Reaction time: 3 hours；Leach solvent and solute weight ratio: 5:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 20g/L；Reaction temperature: 90 DEG C；Reaction time: 1 hour； Sulphur removal solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 63%；Iron ore concentrate iron content 58%, sulfur content 0.34%.
Embodiment 7
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 15g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 3:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 20g/L；Reaction temperature: 90 DEG C；Reaction time: 1 hour； Sulphur removal solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 58%；Iron ore concentrate iron content 51%, sulfur content 0.61%.
Embodiment 8
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 100g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 3:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 10:1；Reaction temperature Degree: 50 DEG C；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 20g/L；Reaction temperature: 90 DEG C；Reaction time: 1 hour； Sulphur removal solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 74%；Iron ore concentrate iron content 62%, sulfur content 0.2%.
Embodiment 9
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 100g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 3:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 0.8:1；Reaction temperature Degree: 50 DEG C；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 20g/L；Reaction temperature: 90 DEG C；Reaction time: 1 hour； Sulphur removal solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 60%；Iron ore concentrate iron content 52%, sulfur content 0.4%.
Embodiment 10
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 100g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 3:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 20g/L；Reaction temperature: 30 DEG C；Reaction time: 3 hours； Sulphur removal solvent and solute weight ratio: 10:1；Second of washing solvent and solute weight ratio: 1:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 73%；Iron ore concentrate iron content 62%, sulfur content 0.18%.
Embodiment 11
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 100g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 3:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 40g/L；Reaction temperature: 95 DEG C；Reaction time: 0.5 is small When；Sulphur removal solvent and solute weight ratio: 0.1:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 68%；Iron ore concentrate iron content 56%, sulfur content 0.25%.
Embodiment 12
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 100g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 3:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 30g/L；Reaction temperature: 25 DEG C；Reaction time: 0.3 is small When；Sulphur removal solvent and solute weight ratio: 0.1:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 62%；Iron ore concentrate iron content 50%, sulfur content 0.6%.
Embodiment 13
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 200g/L；Reaction temperature: 60 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 2.5:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: sodium carbonate；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1.1:1；Reaction temperature Degree: 60 DEG C；Reaction time: 2 hours；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 40g/L；Reaction temperature: 80 DEG C；Reaction time: 1 hour； Sulphur removal solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product is basic carbonate zinc product Zn5(OH)6 (CO3)2, wherein Zn content 54；Iron ore concentrate iron content 55%, sulfur content 0.3%.
Embodiment 14
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 200g/L；Reaction temperature: 90 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 2:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: vulcanized sodium；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1.1:1；Reaction temperature Degree: 60 DEG C；Reaction time: 3 hours；Feed way: to adding.
Sulphur removal process: sulfur elimination: sodium hydroxide solution；Concentration: 10g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours； Sulphur removal solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product is vulcanization zinc product, wherein Zn content 63%；Iron ore concentrate iron content 55%, sulfur content 0.3%.
Embodiment 15
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 100g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 3:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: hydrazine hydrate；Concentration: 30g/L；Reaction temperature: 25 DEG C；Reaction time: 0.3 hour；Sulphur removal Solvent and solute weight ratio: 0.1:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 60%；Iron ore concentrate iron content 52%, sulfur content 0.5%.
Comparative example 1
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 100g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 3:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: milk of lime；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1:1；Reaction temperature: 50℃；Reaction time: 1 hour；Feed way: to adding.
Sulphur removal process: sulfur elimination: hydrochloric acid；Concentration: 20g/L；Reaction temperature: 30 DEG C；Reaction time: 1 hour；Sulphur removal liquid is solid Weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product has obtained hydrogen-oxygen after solid separation Change zinc product, wherein Zn content 40%；Iron ore concentrate iron content 42%, sulfur content 1.2%.
Comparative example 2
Fume from steel making containing zinc is recycled, recycling step is as follows:
Acidleach is carried out to fume from steel making containing zinc, scum and zinc-containing solution is obtained by filtration；
After carrying out first time washing to scum, cleaning solution is returned into zinc-containing solution；Sulphur removal, mistake are carried out to the scum after washing Filter obtains the scum after sulphur removal；Sulfur elimination filtrate cycle after sulphur removal is used；Second is carried out to the scum after sulphur removal to wash, Filtering, obtains iron ore concentrate；
Zinc-containing solution is carried out except iron, filtration washing is obtained except the zinc-containing solution and filter residue after iron；To except containing zinc after iron Solution carries out heavy zinc, and filtration washing obtains zinc salt product.
Technique and raw material in above steps is as follows:
Acidleach process: sulfuric acid concentration: 200g/L；Reaction temperature: 60 DEG C；Reaction time: 2 hours；Leach solvent and solute weight ratio: 2.5:1；Solvent and solute weight ratio: 3:1 is washed for the first time.
Heavy zinc process: precipitating reagent: sodium carbonate；Dosage: the molar ratio with zinc ion in zinc-containing solution is 1.1:1；Reaction temperature Degree: 60 DEG C；Reaction time: 2 hours；Feed way: to adding.
Sulphur removal process: sulfur elimination: oxalic acid solution；Concentration: 10g/L；Reaction temperature: 80 DEG C；Reaction time: 2 hours；Sulphur removal Solvent and solute weight ratio: 3:1；Second of washing solvent and solute weight ratio: 3:1；
Test obtained zinc salt product and iron extract mine producation: zinc salt product is basic carbonate zinc product Zn5(OH)6 (CO3)2, wherein Zn content 41；Iron ore concentrate iron content 40%, sulfur content 1.4%.
It can be seen from the above description that the above embodiments of the present invention realized the following chievements:
It, can more fully will be in flue dust using the process fume from steel making containing zinc in the embodiment of the present invention 1 to 14 Zinc and iron separate, and Zn content and iron content are higher in obtained product, and the sulfur content in iron ore concentrate is lower.
Particularly, the data comparison of embodiment 1 to 4 is it is found that by the process regulation of acidleach process in preferred scope It is more advantageous to the zinc iron content for improving product, reduces the sulfur content in iron ore concentrate；By the data comparison of embodiment 1,5 to 7 it is found that The sulfuric acid concentration of acidleach process is controlled and is more advantageous to the zinc iron content for improving product in preferred scope, is reduced in iron ore concentrate Sulfur content；It is more advantageous in preferred scope by the data comparison in embodiment 1,8,9 it is found that controlling the condition of heavy zinc process The zinc iron content of product is improved, the sulfur content in iron ore concentrate is reduced；By the data comparison of embodiment 1,10 to 12 it is found that by sulphur removal The condition control of process is more advantageous to the zinc iron content for improving product in preferred scope, reduces the sulfur content in iron ore concentrate.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (18)

1. a kind of recovery method of fume from steel making containing zinc, which comprises the following steps:
The fume from steel making containing zinc is subjected to acidleach, obtains scum and zinc-containing solution, the sulphur in the scum is with subsulfate Form exist；
Sulphur removal is carried out to the scum using alkaline sulfur elimination, obtains iron extract mine producation;
Wherein, acidleach is carried out to the fume from steel making containing zinc using sulfuric acid；The concentration of the sulfuric acid is 20 ~ 200g/L.
2. recovery method according to claim 1, which is characterized in that the alkalinity sulfur elimination is sodium hydroxide solution, hydrogen One of potassium oxide solution, ammonium hydroxide and hydrazine hydrate are a variety of, and the concentration of the alkaline sulfur elimination is 20 ~ 40g/L.
3. recovery method according to claim 2, which is characterized in that during the sulphur removal, it is described alkalinity sulfur elimination with Weight ratio between the scum is 0.1 ~ 10:1.
4. recovery method according to claim 3, which is characterized in that during the sulphur removal, control the temperature of reaction system Degree is 30 ~ 95 DEG C, and the reaction time is 0.5 ~ 3h.
5. recovery method according to any one of claim 1 to 4, which is characterized in that the recovery method further include by The step of zinc-containing solution carries out heavy zinc processing, obtains zinc salt product.
6. recovery method according to claim 5, which is characterized in that the precipitating reagent used in the step of heavy zinc is handled For one of sodium hydroxide, sodium carbonate, ammonium bicarbonate, ammonium hydrogen carbonate, milk of lime and vulcanized sodium or a variety of.
7. recovery method according to claim 6, which is characterized in that zinc ion in the precipitating reagent and the zinc-containing solution Molar ratio be 1 ~ 10:1.
8. recovery method according to claim 5, which is characterized in that the step of zinc-containing solution is carried out heavy zinc processing Before, the recovery method further includes the steps that carrying out the zinc-containing solution except iron.
9. recovery method according to claim 8, which is characterized in that described the step of removing iron includes: molten containing zinc to described Iron removing reagent is added in liquid, while being passed through air or oxygen into the zinc-containing solution, after reaction, obtains except described containing zinc after iron Solution.
10. recovery method according to claim 9, which is characterized in that control is described molten containing zinc in described the step of removing iron The pH value of liquid is less than or equal to 5.
11. recovery method according to claim 9, which is characterized in that the iron removing reagent used in the iron removal is oxygen Change one of zinc, zinc carbonate, calcium hydroxide and sodium hydroxide or a variety of.
12. recovery method according to claim 5, which is characterized in that the extraction temperature during the acidleach is 30 ~ 95 DEG C, solvent and solute weight ratio is 2 ~ 5:1, and extraction time is 1 ~ 4h.
13. recovery method according to claim 12, which is characterized in that the heavy zinc temperature in the heavy zinc treatment process is 30 ~ 60 DEG C, the zinc time is sunk for 0.5 ~ 3h.
14. recovery method according to any one of claim 1 to 4, which is characterized in that carry out sulphur removal to the scum Before step, the recovery method further includes the steps that carrying out washing for the first time to the scum.
15. recovery method according to claim 14, which is characterized in that the liquid in the first time washing step consolidates weight Than for 1 ~ 3:1.
16. recovery method according to claim 15, which is characterized in that the filter that will be generated in the first time washing step Washing lotion, which adds in the zinc-containing solution, carries out heavy zinc processing.
17. recovery method according to any one of claim 1 to 4, which is characterized in that carry out sulphur removal to the scum After step, the recovery method further includes the steps that carrying out second to the scum after sulphur removal washs.
18. recovery method according to claim 17, which is characterized in that the liquid in second of washing step consolidates weight Than for 1 ~ 3:1.
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CN102352443A (en) * 2011-10-31 2012-02-15 太仓市南仓金属材料有限公司 Method for producing zinc sulfate heptahydrate, crude tin and crude lead by using tin smelting dust
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