CN106884090A - A kind of sub-molten salt method that vanadium tungsten titanium is reclaimed entirely in waste denitration catalyst - Google Patents
A kind of sub-molten salt method that vanadium tungsten titanium is reclaimed entirely in waste denitration catalyst Download PDFInfo
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- CN106884090A CN106884090A CN201710027052.1A CN201710027052A CN106884090A CN 106884090 A CN106884090 A CN 106884090A CN 201710027052 A CN201710027052 A CN 201710027052A CN 106884090 A CN106884090 A CN 106884090A
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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
- C22B7/006—Wet processes
- C22B7/008—Wet processes by an alkaline or ammoniacal leaching
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- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/10—Obtaining titanium, zirconium or hafnium
- C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
- C22B34/1236—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining titanium or titanium compounds from ores or scrap by wet processes, e.g. by leaching
- C22B34/124—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining titanium or titanium compounds from ores or scrap by wet processes, e.g. by leaching using acidic solutions or liquors
- C22B34/1245—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining titanium or titanium compounds from ores or scrap by wet processes, e.g. by leaching using acidic solutions or liquors containing a halogen ion as active agent
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- C22B34/00—Obtaining refractory metals
- C22B34/20—Obtaining niobium, tantalum or vanadium
- C22B34/22—Obtaining vanadium
- C22B34/225—Obtaining vanadium from spent catalysts
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- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/36—Obtaining tungsten
- C22B34/365—Obtaining tungsten from spent catalysts
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Abstract
A kind of sub-molten salt method that vanadium tungsten titanium is reclaimed entirely in waste denitration catalyst, belongs to solid waste resource using change field.Wherein mainly cover pretreatment, sub-molten salt leach, titanium dioxide reclaim, leachate recycle, calcification precipitation, the separation of vanadium tungsten, deliming, except techniques such as vanadium.Compared with prior art, present invention employs sub-molten salt handling process, energy consumption of reaction can be effectively reduced, green reclaim, zero exhaust emissions is realized, improve the economic worth for recycling, meanwhile, recycling process it is more succinct easy to operate, during waste residue and liquid be also fully recycled, reduce economic input, it is to avoid secondary pollution is produced to environment.
Description
Technical field
Method the present invention relates to reclaim vanadium, tungsten, titanium from waste denitration catalyst, it is more particularly to anti-using sub-molten salt
Vanadium, the method for tungsten in green reclaim waste denitration catalyst are answered, belongs to the recovery technology field of vanadium, tungsten, titanium.
Background technology
Coal-burning power plant's vanadium Ti-base catalyst is complicated due to work system flue gas, the factor, catalyst such as variation of service condition
Extension that can over time is gradually aging, and General Life is 3~5 years, if disposing low-quality coal or bio-coal fuel combination,
Catalyst deactivation rate will be then set to accelerate 3~4 times.At present, power plants SCR installed capacitys are up to 2.15 hundred million kilowatts, SCR markets
Capacity is increased with the speed of 100,000,000 kilowatts/year, and largely replaces imported catalyst using domestic SCR catalyst since 2012,
Catalyst discarded amount in use is caused to greatly increase.At present, mostly used for the denitrating catalyst discarded and filled out
The mode buried is processed, and this can not only waste a large amount of metals resources, while also contaminated soil and water source, severe shadow is caused to environment
Ring.Waste denitration catalyst also typing country poisonous and harmful substance register.So, on how green treatment is discarded out of stock
Catalyst turns into the focus of research.
Conventional catalyst includes yttrium V, W, Ti, wherein, next to that vanadium, tungsten. with Ti content at most.Hua Pan
Dragon, Li Shouxin et al. (A of CN 103130265) proposes the method that titanium dioxide is reclaimed from waste denitration catalyst, by useless
After catalyst is with concentrated sulfuric acid acidolysis, using flocculant and flocculation aid by titanyl sulfate distiller liquor, afterwards by filter press concentration, plus
Pyrohydrolysis is deposited making metatitanic acid.Potassium carbonate or phosphoric acid is added to obtain metatitanic acid filter cake, drying calcining obtains finished titanium dioxide.
Although this technology can largely reclaim titanium dioxide, its process produces a large amount of sulfur dioxide and industrial wastewater.Xiao Yuting,
Zhao is built new et al. (A of CN 102732730) V is reclaimed using electrolysis.Placed by by inactivation denitrating catalyst powder
It is electrolysed in electrolytic cell, takes negative pole mixed liquor and be separated by filtration and obtain mixed solution containing vanadium.Mixed solution containing vanadium carry out re-electrolysis,
Gained positive pole mixed liquor adds ammonium salt solution to obtain vanadium-containing precipitate under alkaline environment, is afterwards that can obtain light containing V by calcination
Yellow solid.Although obtained V purity is higher for the method, but it is high to consume energy, and yield is not high.Zeng Rui et al. (CN
102936039 A) propose the technique that synthetical recovery inactivates honeycomb denitrating catalyst, this technology utilization sodium hydroxide solution high temperature
High-pressure leaching, filter residue is used to produce titanium dioxide, and CaCl is continued with after filtrate concentration2Vanadium, tungsten are separated, ammoniacal liquor point is added afterwards
APT and ammonium metavanadate are not produced.The method operating procedure is more environmentally friendly, and for this patent provides part operation technical support.
Therefore, existing waste denitration catalyst reclaims research and remains in more problem：(1) removal process produces a large amount of dioxies
Change sulphur and industrial wastewater, such as concentrated sulfuric acid acidolysis；(2) reclaim and typically all compare the recovery for concentrating a certain element, be such as directed to titanium elements
Recovery, the recovery of v element etc., cause the waste of element and the consumption of the energy, thus the experimentation for reclaiming need it is simpler
It is clean, harmless, can industrialize.
The content of the invention
The main purpose of this invention mainly solves the problems, such as the comprehensive reutilization of discarded business denitrating catalyst, can not only
The synthetical recovery of vanadium, tungsten, titanium is enough realized, and realizes harmless green reclaim.The technique has the economic worth for recycling
It is high, the features such as technological process is short, energy consumption is low, secondary pollution is few.Reclaimed using sub-molten salt method and discarded in the out of stock catalyst of business
Yttrium V, W, Ti, can avoid producing escaping gas contaminated air, effectively reduce reaction temperature, improve reaction effect
Rate, reducing energy consumption.
The sub-molten salt method that vanadium tungsten titanium is reclaimed entirely in a kind of waste denitration catalyst of the present invention, including following step
Suddenly：
(1) pre-process：Waste denitration catalyst is carried out into soot blowing and milled processed, waste denitration catalyst powder is obtained；
(2) sub-molten salt is leached：The waste denitration catalyst powder that step (1) is obtained and NaOH sub-molten salt leachate
Leached, leachate NaOH sub-molten salt concentration is preferably 5mol/L~10mol/L, and solid-to-liquid ratio is preferably 1g:40ml~
1g:100ml, extraction temperature is preferably 130 DEG C~180 DEG C, and extraction time is preferably 4-8h, obtains leachate and leached mud；
(3) titanium dioxide is reclaimed：The leached mud that step (2) is obtained is carried out into cleaning filtering using hydrochloric acid, anatase is obtained
Type titanium dioxide and cleaning fluid, cleaning fluid evaporative crystallization are obtained NaCl；
(4) leachate is recycled：The leachate that step (2) is obtained continues to mix with NaOH sub-molten salt to carry out Asia
Fused salt leaching behavior, carries out recycling for leachate, until the W content in leachate reaches certain requirement, stops circulation,
Carry out the calcification precipitation of latter step；It is preferred that the mass fraction of wolfram element reaches 5%~10% i.e. stopping circulation in leachate.
(5) calcification precipitation：Hydrochloric acid and calcium chloride are added in leachate to the stopping circulation being obtained in step (4) carries out calcium
Change precipitation, it is specific preferred：First to adding hydrochloric acid conditioning solution pH in the leachate for stopping circulation to certain value, preferably pH for 5~
7, it is subsequently adding calcium chloride solution and is precipitated, the amount for adding calcium chloride solution is no longer being generated to precipitation, to be filtrated to get
Tungstovandate is precipitated and except tungsten vanadium filtrate, except tungsten vanadium filtrate evaporative crystallization obtains NaCl, Ca (Cl)2；
(6) vanadium tungsten is separated：Formic acid solution Selectively leaching vanadium will be added in tungstovandate precipitation obtained by step (5), entered
Went and filtered tungsten, obtained wolframic acid calcium precipitate with except tungsten liquid, solid-to-liquid ratio was preferably 1g:2ml~1g:6ml, reaction temperature is preferably 20~
60 DEG C, the reaction time is preferably 20~50min, and the pH for being preferably added to formic acid solution is 1~5；
(7) deliming：To step (6) obtain except adding in tungsten filtrate sulfuric acid to be precipitated, the addition of sulfuric acid be until
Untill not producing precipitation, calcium sulfate and deliming liquid are filtrated to get；
(8) except vanadium：To adding ammoniacal liquor to be precipitated in the deliming liquid obtained by step (7), the addition of ammoniacal liquor is until not
Untill producing precipitation, filtering can obtain ammonium metavanadate precipitate and except vanadium liquid, except vanadium liquid return to step (6) and formic acid carry out vanadium tungsten jointly
Separate.
The present invention realizes the full recovery of vanadium, tungsten, titanium valuable metal, effectively alleviates respective resources pressure, with good
Social benefit；Simultaneously, it is to avoid the air pollution that traditional pyrogenic process noxious material volatilization is caused, the waste water produced in removal process is realized
Recycle, it is to avoid water pollution.Sub-molten salt method has organic efficiency high, low production cost feature, with huge economy
Benefit and social benefit.
Brief description of the drawings
Fig. 1 represents the full sub-molten salt method process chart for reclaiming of vanadium tungsten titanium in a kind of waste denitration catalyst；
Specific embodiment
With reference to embodiment, the present invention will be described, but the present invention is not limited in following examples.
Embodiment 1
Waste denitration catalyst is carried out into soot blowing and milled processed, waste denitration catalyst powder is obtained；By discarded denitration
Catalyst fines is leached with NaOH sub-molten salt leachate, and leachate NaOH sub-molten salt concentration is 5mol/L, Gu
Liquor ratio is 1g:40ml, extraction temperature is 130 DEG C, and extraction time is 4h, obtains leachate and leached mud；Leached mud is utilized into salt
Acid carries out cleaning filtering, obtains anatase titanium dioxide and cleaning fluid, and cleaning fluid evaporative crystallization is obtained NaCl；By leachate after
Continue to mix with NaOH sub-molten salt and carry out sub-molten salt leaching behavior, recycling for leachate is carried out, until the tungsten in solution
Content reaches 5%, stops circulation；Reached to W content mass fraction and add in 5% leachate hydrochloric acid and calcium chloride and carry out calcification
Precipitation, is first 5 to pH to hydrochloric acid conditioning solution is added in solution, is subsequently adding calcium chloride solution, and the amount of calcium chloride solution is straight
To precipitation is not produced, tungstovandate precipitation is obtained and except tungsten vanadium filtrate, except tungsten vanadium filtrate evaporative crystallization obtains NaCl, Ca
(Cl)2；Formic acid solution Selectively leaching vanadium is added during tungstovandate is precipitated, filtered except tungsten, solid-to-liquid ratio is 1g:2ml, instead
Answer temperature for 20 DEG C, the reaction time is 20min, the pH for adding formic acid solution is 1, obtain wolframic acid calcium precipitate and remove tungsten liquid；To except tungsten
Add sulfuric acid to be precipitated in filtrate, the addition of sulfuric acid be until not producing precipitation untill, be filtrated to get calcium sulfate and deliming
Liquid；To adding ammoniacal liquor to be precipitated in deliming liquid, the addition of ammoniacal liquor be until not producing precipitation untill, filtering can obtain metavanadic acid
Ammonium is precipitated and except vanadium liquid, except vanadium liquid recycle and reuse carries out vanadium tungsten separation.The rate of recovery 94.2% of this secondary response titanium, tungsten return
Yield 92.8%, the rate of recovery 93.6% of vanadium.
Embodiment 2
Waste denitration catalyst is carried out into soot blowing and milled processed, waste denitration catalyst powder is obtained；By discarded denitration
Catalyst fines is leached with NaOH sub-molten salt leachate, and leachate NaOH sub-molten salt concentration is 10mol/L, Gu
Liquor ratio is 1g:100ml, extraction temperature is 180 DEG C, and extraction time is 8h, obtains leachate and leached mud；Leached mud is utilized into salt
Acid carries out cleaning filtering, obtains anatase titanium dioxide and cleaning fluid, and cleaning fluid evaporative crystallization is obtained NaCl；By leachate after
Continue to mix with NaOH sub-molten salt and carry out sub-molten salt leaching behavior, recycling for leachate is carried out, until the tungsten in solution
Content reaches 10%, stops circulation；Reached to W content mass fraction and add in 10% leachate hydrochloric acid and calcium chloride and carry out calcium
Change precipitation, be first 7 to pH to hydrochloric acid conditioning solution is added in solution, be subsequently adding calcium chloride solution, the amount of calcium chloride solution is
Untill until not producing precipitation, tungstovandate precipitation is obtained and except tungsten vanadium filtrate, except tungsten vanadium filtrate evaporative crystallization obtains NaCl, Ca
(Cl)2；Formic acid solution Selectively leaching vanadium is added during tungstovandate is precipitated, filtered except tungsten, solid-to-liquid ratio is 1g:6ml, instead
Answer temperature for 60 DEG C, the reaction time is 50min, the pH for adding formic acid solution is 5, obtain wolframic acid calcium precipitate and remove tungsten liquid；To except tungsten
Add sulfuric acid to be precipitated in filtrate, the addition of sulfuric acid be until not producing precipitation untill, be filtrated to get calcium sulfate and deliming
Liquid；To adding ammoniacal liquor to be precipitated in deliming liquid, the addition of ammoniacal liquor be until not producing precipitation untill, filtering can obtain metavanadic acid
Ammonium is precipitated and except vanadium liquid, except vanadium liquid recycle and reuse carries out vanadium tungsten separation.The rate of recovery 92.8% of this secondary response titanium, tungsten return
Yield 96.1%, the rate of recovery 97.3% of vanadium.
Embodiment 3
Waste denitration catalyst is carried out into soot blowing and milled processed, waste denitration catalyst powder is obtained；By discarded denitration
Catalyst fines is leached with NaOH sub-molten salt leachate, and leachate NaOH sub-molten salt concentration is 6mol/L, Gu
Liquor ratio is 1g:50ml, extraction temperature is 140 DEG C, and extraction time is 5h, obtains leachate and leached mud；Leached mud is utilized into salt
Acid carries out cleaning filtering, obtains anatase titanium dioxide and cleaning fluid, and cleaning fluid evaporative crystallization is obtained NaCl；By leachate after
Continue to mix with NaOH sub-molten salt and carry out sub-molten salt leaching behavior, recycling for leachate is carried out, until the tungsten in solution
Content reaches 6%, stops circulation；Reached to W content mass fraction and add in 6% leachate hydrochloric acid and calcium chloride and carry out calcification
Precipitation, is first 5.5 to pH to hydrochloric acid conditioning solution is added in solution, is subsequently adding calcium chloride solution, and the amount of calcium chloride solution is
Untill until not producing precipitation, tungstovandate precipitation is obtained and except tungsten vanadium filtrate, except tungsten vanadium filtrate evaporative crystallization obtains NaCl, Ca
(Cl)2；Formic acid solution Selectively leaching vanadium is added during tungstovandate is precipitated, filtered except tungsten, solid-to-liquid ratio is 1g:3ml, instead
Answer temperature for 30 DEG C, the reaction time is 30min, the pH for adding formic acid solution is 2, obtain wolframic acid calcium precipitate and remove tungsten liquid；To except tungsten
Add sulfuric acid to be precipitated in filtrate, the addition of sulfuric acid be until not producing precipitation untill, be filtrated to get calcium sulfate and deliming
Liquid；To adding ammoniacal liquor to be precipitated in deliming liquid, the addition of ammoniacal liquor be until not producing precipitation untill, filtering can obtain metavanadic acid
Ammonium is precipitated and except vanadium liquid, except vanadium liquid recycle and reuse carries out vanadium tungsten separation.The rate of recovery 93.5% of this secondary response titanium, tungsten return
Yield 91.4%, the rate of recovery 93.3% of vanadium.
Embodiment 4
Waste denitration catalyst is carried out into soot blowing and milled processed, waste denitration catalyst powder is obtained；By discarded denitration
Catalyst fines is leached with NaOH sub-molten salt leachate, and leachate NaOH sub-molten salt concentration is 7mol/L, Gu
Liquor ratio is 1g:60ml, extraction temperature is 150 DEG C, and extraction time is 6h, obtains leachate and leached mud；Leached mud is utilized into salt
Acid carries out cleaning filtering, obtains anatase titanium dioxide and cleaning fluid, and cleaning fluid evaporative crystallization is obtained NaCl；By leachate after
Continue to mix with NaOH sub-molten salt and carry out sub-molten salt leaching behavior, recycling for leachate is carried out, until the tungsten in solution
Content reaches 7%, stops circulation；Reached to W content mass fraction and add in 7% leachate hydrochloric acid and calcium chloride and carry out calcification
Precipitation, is first 6 to pH to hydrochloric acid conditioning solution is added in solution, is subsequently adding calcium chloride solution, and the amount of calcium chloride solution is straight
To precipitation is not produced, tungstovandate precipitation is obtained and except tungsten vanadium filtrate, except tungsten vanadium filtrate evaporative crystallization obtains NaCl, Ca
(Cl)2；Formic acid solution Selectively leaching vanadium is added during tungstovandate is precipitated, filtered except tungsten, solid-to-liquid ratio is 1g:4ml, instead
Answer temperature for 40 DEG C, the reaction time is 40min, the pH for adding formic acid solution is 3, obtain wolframic acid calcium precipitate and remove tungsten liquid；To except tungsten
Add sulfuric acid to be precipitated in filtrate, the addition of sulfuric acid be until not producing precipitation untill, be filtrated to get calcium sulfate and deliming
Liquid；To adding ammoniacal liquor to be precipitated in deliming liquid, the addition of ammoniacal liquor be until not producing precipitation untill, filtering can obtain metavanadic acid
Ammonium is precipitated and except vanadium liquid, except vanadium liquid recycle and reuse carries out vanadium tungsten separation.The rate of recovery 92.3% of this secondary response titanium, tungsten return
Yield 94.0%, the rate of recovery 93.5% of vanadium.
Embodiment 5
Waste denitration catalyst is carried out into soot blowing and milled processed, waste denitration catalyst powder is obtained；By discarded denitration
Catalyst fines is leached with NaOH sub-molten salt leachate, and leachate NaOH sub-molten salt concentration is 8mol/L, Gu
Liquor ratio is 1g:70ml, extraction temperature is 160 DEG C, and extraction time is 7h, obtains leachate and leached mud；Leached mud is utilized into salt
Acid carries out cleaning filtering, obtains anatase titanium dioxide and cleaning fluid, and cleaning fluid evaporative crystallization is obtained NaCl；By leachate after
Continue to mix with NaOH sub-molten salt and carry out sub-molten salt leaching behavior, recycling for leachate is carried out, until the tungsten in solution
Content reaches 8%, stops circulation；Reached to W content mass fraction and add in 8% leachate hydrochloric acid and calcium chloride and carry out calcification
Precipitation, is first 6.5 to pH to hydrochloric acid conditioning solution is added in solution, is subsequently adding calcium chloride solution, and the amount of calcium chloride solution is
Untill until not producing precipitation, tungstovandate precipitation is obtained and except tungsten vanadium filtrate, except tungsten vanadium filtrate evaporative crystallization obtains NaCl, Ca
(Cl)2；Formic acid solution Selectively leaching vanadium is added during tungstovandate is precipitated, filtered except tungsten, solid-to-liquid ratio is 1g:5ml, instead
Answer temperature for 50 DEG C, the reaction time is 50min, the pH for adding formic acid solution is 4, obtain wolframic acid calcium precipitate and remove tungsten liquid；To except tungsten
Add sulfuric acid to be precipitated in filtrate, the addition of sulfuric acid be until not producing precipitation untill, be filtrated to get calcium sulfate and deliming
Liquid；To adding ammoniacal liquor to be precipitated in deliming liquid, the addition of ammoniacal liquor be until not producing precipitation untill, filtering can obtain metavanadic acid
Ammonium is precipitated and except vanadium liquid, except vanadium liquid recycle and reuse carries out vanadium tungsten separation.The rate of recovery 93.1% of this secondary response titanium, tungsten return
Yield 95.3%, the rate of recovery 92.5% of vanadium.
Claims (6)
1. a kind of sub-molten salt method that vanadium tungsten titanium is reclaimed entirely in waste denitration catalyst, it is characterised in that comprise the following steps：
(1) pre-process：Waste denitration catalyst is carried out into soot blowing and milled processed, waste denitration catalyst powder is obtained；
(2) sub-molten salt is leached：The waste denitration catalyst powder that step (1) is obtained is carried out with NaOH sub-molten salt leachate
Leach, obtain leachate and leached mud；
(3) titanium dioxide is reclaimed：The leached mud that step (2) is obtained is carried out into cleaning filtering using hydrochloric acid, Detitanium-ore-type two is obtained
Titanium oxide and cleaning fluid, cleaning fluid evaporative crystallization are obtained NaCl；
(4) leachate is recycled：The leachate that step (2) is obtained continues to mix with NaOH sub-molten salt to carry out sub-molten salt
Leaching behavior, carries out recycling for leachate, until the W content in leachate reaches certain requirement, stops circulation, carries out
The calcification precipitation of latter step；
(5) calcification precipitation：Add hydrochloric acid and calcium chloride to carry out calcification in leachate to the stopping circulation being obtained in step (4) to sink
Form sediment, it is specific preferred：First to adding hydrochloric acid conditioning solution pH to certain value in the leachate for stopping circulation, calcium chloride is subsequently adding molten
Liquid is precipitated, and the amount for adding calcium chloride solution is no longer being generated to precipitation, to be filtrated to get tungstovandate precipitation and except tungsten
Vanadium filtrate, except tungsten vanadium filtrate evaporative crystallization obtains NaCl, Ca (Cl)2；
(6) vanadium tungsten is separated：Formic acid solution Selectively leaching vanadium will be added in tungstovandate precipitation obtained by step (5), carried out
Tungsten is filtered, wolframic acid calcium precipitate is obtained and is removed tungsten liquid；
(7) deliming：To step (6) obtain except adding in tungsten filtrate sulfuric acid to be precipitated, the addition of sulfuric acid is until not producing
Untill raw precipitation, calcium sulfate and deliming liquid are filtrated to get；
(8) except vanadium：To adding ammoniacal liquor to be precipitated in the deliming liquid obtained by step (7), the addition of ammoniacal liquor is until not producing
Untill precipitation, filtering can obtain ammonium metavanadate precipitate and except vanadium liquid, except vanadium liquid return to step (6) and formic acid carry out vanadium tungsten point jointly
From.
2. the sub-molten salt method for being reclaimed entirely according to vanadium tungsten titanium in a kind of waste denitration catalyst described in claim 1, its feature
It is that step (2) leachate NaOH sub-molten salt concentration is preferably 5mol/L~10mol/L.
3. the sub-molten salt method for being reclaimed entirely according to vanadium tungsten titanium in a kind of waste denitration catalyst described in claim 1, its feature
It is that step (2) solid-to-liquid ratio is 1g:40ml~1g:100ml, extraction temperature is 130 DEG C~180 DEG C, and extraction time is 4~8h.
4. the sub-molten salt method for being reclaimed entirely according to vanadium tungsten titanium in a kind of waste denitration catalyst described in claim 1, its feature
It is that the mass fraction of wolfram element reaches 5%~10% and stops circulating in step (4) leachate.
5. the sub-molten salt method for being reclaimed entirely according to vanadium tungsten titanium in a kind of waste denitration catalyst described in claim 1, its feature
It is that it is 5~7 that step (5) adds hydrochloric acid conditioning solution pH.
6. the sub-molten salt method for being reclaimed entirely according to vanadium tungsten titanium in a kind of waste denitration catalyst described in claim 1, its feature
It is that step (6) solid-to-liquid ratio is 1g:2ml~1g:6ml, reaction temperature is 20~60 DEG C, and the reaction time is 20~50min, plus
The pH for entering formic acid solution is 1~5.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107557599A (en) * | 2017-07-20 | 2018-01-09 | 北京世纪地和控股有限公司 | Tungsten, the method for vanadium are reclaimed in discarded SCR denitration |
| CN110195161A (en) * | 2019-06-10 | 2019-09-03 | 江西理工大学 | The method of Al, Co are recycled from useless aluminium-based catalyst sodium roasting water logging slag |
| CN110699552A (en) * | 2019-10-25 | 2020-01-17 | 郑州大学 | Method for selectively extracting high-purity metal titanium from SCR catalyst |
| CN110721754A (en) * | 2019-11-15 | 2020-01-24 | 清大国华环境集团股份有限公司 | Regeneration and recovery method of waste SCR denitration catalyst |
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| CN110699552B (en) * | 2019-10-25 | 2021-06-11 | 郑州大学 | Method for selectively extracting high-purity metal titanium from SCR catalyst |
| CN110721754A (en) * | 2019-11-15 | 2020-01-24 | 清大国华环境集团股份有限公司 | Regeneration and recovery method of waste SCR denitration catalyst |
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| CN114534706A (en) * | 2022-01-17 | 2022-05-27 | 北京科技大学 | Method for preparing titanium-silicon carrier by recovering waste denitration catalyst |
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