CN112551577A - Preparation method of vanadyl sulfate solution for regeneration of inactivated denitration catalyst - Google Patents
Preparation method of vanadyl sulfate solution for regeneration of inactivated denitration catalyst Download PDFInfo
- Publication number
- CN112551577A CN112551577A CN201910911253.7A CN201910911253A CN112551577A CN 112551577 A CN112551577 A CN 112551577A CN 201910911253 A CN201910911253 A CN 201910911253A CN 112551577 A CN112551577 A CN 112551577A
- Authority
- CN
- China
- Prior art keywords
- vanadyl sulfate
- ammonium
- sulfate solution
- denitration catalyst
- weight ratio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G31/00—Compounds of vanadium
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Abstract
The invention belongs to the technical field of hydrometallurgy, and particularly relates to a preparation method of vanadyl sulfate solution for regenerating an inactivated denitration catalyst, which comprises the following steps: ammonium vanadate and water are pulped, acidized by sulfuric acid, reduced by a reducing agent, and solid-liquid separation is carried out, so that vanadyl sulfate solution and residues are obtained. The method has simple operation, the vanadium raw material for reaction is simple and easy to obtain, and the yield of the vanadium is high; the full-wet method operation is carried out, and no ammonia nitrogen wastewater and waste gas are produced; has wide application prospect in the regeneration of the increasingly deactivated denitration catalyst.
Description
Technical Field
The invention belongs to the technical field of wet metallurgy, and particularly relates to a preparation method of vanadyl sulfate solution for regenerating an inactivated denitration catalyst.
Background
At present, flue gas denitration is a conventional method for treating nitrogen-containing oxides, a vanadium-containing denitration catalyst is required in the denitration process, and the denitration catalyst loses catalytic activity after being used for many times, namely deactivation for short. The deactivated denitration catalyst can be regenerated by vanadyl sulfate solution, and the method becomes a common method for prolonging the service life of the denitration catalyst and reducing the denitration cost. The vanadyl sulfate solution used in the method comprises the following main components: 32. + -. 3% VOSO4Fe is less than or equal to 0.15 percent, K is less than or equal to 0.10 percent, Na is less than or equal to 0.15 percent, and the solution density is 1.36-1.47 g/ml.
The existing vanadyl sulfate is prepared by adopting a high-purity vanadic anhydride sulfuric acid acidification reduction process, the preparation of the high-purity vanadic anhydride needs to prepare ammonium vanadate, and the ammonium vanadate is obtained by calcining and oxidizing, so that the treatment process flow is increased, the production cost is increased, ammonia gas is also brought in the calcining process and needs to be absorbed, and otherwise, the environmental pollution is caused.
CN101920994A discloses a method for preparing vanadyl sulfate, which comprises the following steps: calcining ammonium metavanadate in a closed reactor at the temperature of 540-600 ℃; adding sulfuric acid to the product obtained by calcination and introducing SO2Heating and boiling the gas; crystallizing the solution obtained after heating and boiling to obtain vanadyl sulfate. The method firstly calcines ammonium metavanadate to obtain V2O5And ammonia gas, and further decomposing the obtained ammonia gas into nitrogen gas and hydrogen gas, the hydrogen gas converting V2O5Reduction to V2O4Finally let V2O4Reacts with sulfuric acid to generate vanadyl sulfate. The method has the advantages that ammonia decomposition is feasible only by the presence of a catalyst at 800-850 ℃, the cost is high, and the process flow is increased; meanwhile, ammonia gas cannot be completely decomposed under industrial equipment conditions, and needs to be absorbed, otherwise, environmental pollution is caused.
CN108975399A discloses a method for preparing vanadyl sulfate, which comprises the following steps: dissolving ammonium metavanadate, adding an impurity removing agent, adjusting the pH value of the solution to 6-8.5 to dissolve vanadium, and performing solid-liquid separation after the vanadium dissolution is finished to obtain a purified vanadium dissolving solution; heating the purified vanadium solution, then adjusting the pH to 6-5.8, 5.7-5.4, 4.8-4.0 and 2.4-1.9 in sequence, carrying out gradient vanadium precipitation, and carrying out solid-liquid separation to obtain vanadium precipitation mother liquor and solid-phase ammonium polyvanadate; calcining ammonium polyvanadate to remove ammonia to obtain vanadium pentoxide; and mixing the obtained vanadium pentoxide with sulfuric acid, and adding a reducing agent to obtain a vanadyl sulfate solution. The method has complicated steps and high cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of vanadyl sulfate solution for regenerating a deactivated denitration catalyst, which comprises the following steps: ammonium vanadate and water are pulped, acidized by sulfuric acid, reduced by a reducing agent, and solid-liquid separation is carried out, so that vanadyl sulfate solution and residues are obtained.
According to the preparation method of the vanadyl sulfate solution for regenerating the inactivated denitration catalyst, the ammonium vanadate is ammonium metavanadate and/or ammonium polyvanadate.
According to the preparation method of the vanadyl sulfate solution for regenerating the inactivated denitration catalyst, the weight volume ratio of ammonium vanadate to water is 100 g: 400-520 ml; preferably, the weight volume ratio of the ammonium metavanadate to the water is 100 g: 400-430 ml, wherein the weight volume ratio of the ammonium polyvanadate to the water is 100 g: 490-520 ml.
According to the preparation method of the vanadyl sulfate solution for regenerating the inactivated denitration catalyst, the weight ratio of sulfuric acid to ammonium vanadate is (11-13): 10; preferably, the weight ratio of the sulfuric acid to the ammonium metavanadate is 12-13: 10, the weight ratio of the sulfuric acid to the ammonium polyvanadate is 11-12: 10.
according to the preparation method of the vanadyl sulfate solution for regenerating the inactivated denitration catalyst, the mass fraction of sulfuric acid is more than or equal to 95%; preferably, the mass fraction of the sulfuric acid is more than or equal to 98 percent.
The preparation method of the vanadyl sulfate solution for regenerating the inactivated denitration catalyst comprises the following steps of (1) preparing a reducing agent, wherein the reducing agent is one or more than two of oxalic acid, tartaric acid or hydrazine hydrate; preferably, the reducing agent is oxalic acid.
According to the preparation method of the vanadyl sulfate solution for regenerating the inactivated denitration catalyst, the weight ratio of the reducing agent to the ammonium vanadate is (6-65): 100, respectively; preferably, the weight ratio of the oxalic acid to the ammonium metavanadate is 53-55: 100, respectively; the weight ratio of the oxalic acid to the ammonium polyvanadate is 63-65: 100, respectively; the weight ratio of the tartaric acid to the ammonium metavanadate is 12-14: 100, respectively; the weight ratio of the tartaric acid to the ammonium polyvanadate is 14.5-16.5: 100, respectively; the weight ratio of the ammonium metavanadate to the hydrazine hydrate is 6-8: 100, respectively; the weight ratio of the ammonium polyvanadate to the hydrazine hydrate is 7.5-9.5: 100.
the preparation method of the vanadyl sulfate solution for regenerating the inactivated denitration catalyst comprises the following steps of reducing at 50-90 ℃; the reduction time is 60-180 min.
According to the preparation method of the vanadyl sulfate solution for regenerating the inactivated denitration catalyst, the stirring speed during pulping, acidification and reduction is 200-350 r/min.
The invention has the beneficial effects that:
the method adopts ammonium vanadate as a raw material, adds sulfuric acid to adjust the pH value, and then adds a reducing agent to reduce to obtain a mixed solution of vanadyl sulfate and ammonium sulfate. The vanadyl sulfate mixed solution has low iron content and low sodium content, and can meet the requirement of regeneration of the inactivated denitration catalyst. The used raw materials are cheap and easy to obtain, each step is easy to realize in industrial production, the application prospect is excellent, and the method has a wide application prospect in the increasingly regeneration of the inactivated denitration catalyst.
Detailed Description
The preparation method of the vanadyl sulfate solution for regenerating the inactivated denitration catalyst comprises the following steps: a. adding ammonium vanadate into water, stirring and pulping; b. adding sulfuric acid and stirring uniformly; c. adding a reducing agent to carry out reduction reaction under the condition of heating and stirring; d. after the reaction is finished, carrying out solid-liquid separation to obtain a target product vanadyl sulfate solution and residues; e. the residue is mainly unreacted ammonium vanadate and is returned to the next cycle for treatment.
The reactions occurring in the steps of the invention are as follows:
b, decomposing ammonium vanadate: (NH)4)2V6O16+4H2SO4＝3(VO2)2SO4+(NH4)2SO4+4H2O to obtain vanadyl (V) sulfate solution
c, reducing pentavalent vanadium into tetravalent vanadium to obtain a mixed solution of vanadyl sulfate (IV) and ammonium sulfate: (VO)2)2SO4+H2SO4+H2C2O4＝2VOSO4+2CO2+2H2O
In the method, any liquid-solid ratio can be considered in principle, but the liquid-solid ratio can affect the vanadium concentration and density of the vanadyl sulfate solution, if the vanadium concentration is too high or too low, the subsequent adjustment is carried out for obtaining the qualified vanadyl sulfate solution, in order to avoid the subsequent adjustment process, a proper liquid-solid ratio is ensured at the early stage to ensure proper vanadium concentration, and the weight-volume ratio of ammonium vanadate to water is set as 100 g: 400-520 ml; preferably, the weight volume ratio of the ammonium metavanadate to the water is 100 g: 400-430 ml, wherein the weight volume ratio of the ammonium polyvanadate to the water is 100 g: 490-520 ml.
In the method, the addition of the sulfuric acid is firstly ensured to be capable of generating vanadyl (V) sulfate and ammonium sulfate, meanwhile, the residual sulfuric acid amount cannot be too much, if the sulfuric acid amount is too much, the pH requirement of vanadyl sulfate solution for regenerating the deactivated denitration catalyst is not met, and if the addition of the sulfuric acid is too little, the vanadium cannot be completely converted. Therefore, the weight ratio of the sulfuric acid to the ammonium vanadate is set to be 11-13: 10; preferably, the weight ratio of the sulfuric acid to the ammonium metavanadate is 12-13: 10, the weight ratio of the sulfuric acid to the ammonium polyvanadate is 11-12: 10.
in the method, the mass fraction of the sulfuric acid is more than or equal to 95 percent; preferably, the mass fraction of the sulfuric acid is more than or equal to 98 percent.
The inventor of the invention finds that the reducing agent can use homologous sulfur oxides, such as sulfur dioxide and sulfurous acid; a wide variety of organic reducing agents may also be used. The use of sulfur can be changed into sulfuric acid, which can interfere the sulfuric acid balance in the reaction process on one hand, and can reduce the use amount of sulfuric acid on the other hand, so that the reaction process is not easy to regulate and control and is not generally used; organic reducing agents such as oxalic acid, tartaric acid, hydrazine hydrate and the like generate carbon dioxide and water after reaction, and do not interfere with a reaction system, but most of the organic reducing agents are high in price, so that oxalic acid with low price and good reaction activity is generally adopted.
In the method, the reducing agent is less, and the pentavalent vanadium cannot be completely reduced into the tetravalent vanadium; the excessive reducing agent can cause waste and increase the reaction cost. Therefore, the weight ratio of the reducing agent to the ammonium vanadate is set to be 6-65: 100, respectively; preferably, the weight ratio of the oxalic acid to the ammonium metavanadate is 53-55: 100, respectively; the weight ratio of the oxalic acid to the ammonium polyvanadate is 63-65: 100, respectively; the weight ratio of the tartaric acid to the ammonium metavanadate is 12-14: 100, respectively; the weight ratio of the tartaric acid to the ammonium polyvanadate is 14.5-16.5: 100, respectively; the weight ratio of the ammonium metavanadate to the hydrazine hydrate is 6-8: 100, respectively; the weight ratio of the ammonium polyvanadate to the hydrazine hydrate is 7.5-9.5: 100.
in the method, the reaction temperature is too low, the reaction effect is poor, the reaction rate is low, and the production efficiency is influenced; the reaction temperature is high, oxalic acid in the reducing agent can volatilize, the waste of the reducing agent is caused, and the working environment is deteriorated; meanwhile, the reaction temperature is too high, the reaction rate is high, and more carbon dioxide is released in a short time, so that splashing can be caused, the operation environment is deteriorated, and vanadium loss is caused. Therefore, the temperature of reduction is set to be 50-90 ℃; the reduction time is 60-180 min.
In the method of the present invention, if the rotation speed is too slow, the reaction kinetic conditions are not good; too fast a rotation speed consumes energy, resulting in waste. Therefore, the stirring speed during pulping, acidification and reduction is set to be 200-350 r/m.
The invention has the following advantages: (1) the method has rich vanadium resources and high vanadium yield; (2) the full-wet method operation has good operation environment, no ammonia nitrogen wastewater and waste gas output and the like; (3) directly obtain the vanadyl sulfate mixed solution without separating from ammonium sulfate, and the preparation process is simple.
The scheme of the invention will be explained with reference to the examples. It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The raw materials are not indicated by manufacturers, and are all conventional products which can be obtained commercially.
Example 1
Putting 415ml of water into a 1000ml glass beaker, starting from an electrically heated water bath kettle, starting stirring at the rotating speed of 200 revolutions per minute; uniformly adding 100g (dry basis) of ammonium metavanadate within 5min for pulping, and uniformly adding 128g of 98% concentrated sulfuric acid within 10min for acidizing; uniformly adding 54.0g of oxalic acid within 20min, starting an electric heating switch of a water bath kettle to start heating, setting the heating temperature to be 50 ℃, and heating for 180 min; supplementing water in the reaction process, and maintaining the solution amount in the beaker to be 435 ml; and (4) after the reaction is finished, closing the heating switch, stopping stirring, and performing solid-liquid separation to obtain 430ml of vanadyl sulfate solution and trace residues.
The analysis result shows that the vanadyl sulfate (VOSO) of the vanadyl sulfate solution4) The content is 31.8 percent, the solution density is 1.38g/ml, and the recovery rate of vanadium is 99.85 percent.
Example 2
500ml of water is taken and put into a 1000ml glass beaker, and the water is put into an electrically heated water bath kettle, and stirring is started at the rotating speed of 250 r/min; uniformly adding 100g (dry basis) of ammonium polyvanadate within 5min for pulping, and uniformly adding 117g of 98% concentrated sulfuric acid within 10min for acidizing; uniformly adding 64.5g of oxalic acid within 20 min; starting an electric heating switch of the water bath kettle to start heating, setting the heating temperature to be 70 ℃, and heating for 150 min; supplementing water in the reaction process, and maintaining the solution amount in the beaker to be 515 ml; and (4) after the reaction is finished, closing the heating switch, stopping stirring, and performing solid-liquid separation to obtain 505ml of vanadyl sulfate solution and trace residues.
The analysis result shows that the vanadyl sulfate (VOSO) of the vanadyl sulfate solution4) The content is 32.3 percent, the solution density is 1.36g/ml, and the vanadium recovery rate is 99.82 percent.
Example 3
500ml of water is taken and put into a 1000ml glass beaker, and the water is put into an electrically heated water bath kettle, and stirring is started at the rotating speed of 300 r/min; uniformly adding 100g (dry basis) of ammonium polyvanadate within 5min for pulping, and uniformly adding 117g of 98% concentrated sulfuric acid within 10min for acidizing; uniformly adding 15.8g of tartaric acid within 20 min; starting an electric heating switch of the water bath kettle to start heating, setting the heating temperature to be 90 ℃, and heating for 60 min; supplementing water in the reaction process, and maintaining the solution amount in the beaker to be 515 ml; and (4) after the reaction is finished, closing the heating switch, stopping stirring, and performing solid-liquid separation to obtain 507ml of vanadyl sulfate solution and trace residues.
The analysis result shows that the vanadyl sulfate (VOSO) of the vanadyl sulfate solution4) The content is 31.7 percent, the solution density is 1.39g/ml, and the vanadium recovery rate is 99.87 percent.
Example 4
500ml of water is taken and put into a 1000ml glass beaker, and the water is put into an electrically heated water bath kettle, and stirring is started at the rotating speed of 200 revolutions per minute; uniformly adding 100g (dry basis) of ammonium polyvanadate within 5min for pulping, and uniformly adding 117g of 98% concentrated sulfuric acid within 10min for acidizing; uniformly adding 8.8g of hydrazine hydrate within 20 min; starting an electric heating switch of the water bath kettle to start heating, setting the heating temperature to be 60 ℃, and heating for 90 min; supplementing water in the reaction process, and maintaining the solution amount in the beaker to be 515 ml; and (4) after the reaction is finished, closing the heating switch, stopping stirring, and performing solid-liquid separation to obtain 510ml of vanadyl sulfate solution and trace residues.
The analysis result shows that the vanadyl sulfate (VOSO) of the vanadyl sulfate solution4) The content is 31.2 percent, the solution density is 1.37g/ml, and the recovery rate of vanadium is 99.83 percent.
Example 5
Putting 415ml of water into a 1000ml glass beaker, starting from an electrically heated water bath kettle, starting stirring at the rotating speed of 250 revolutions per minute; uniformly adding 100g (dry basis) of ammonium metavanadate within 5min for pulping, and uniformly adding 128g of 98% concentrated sulfuric acid within 10min for acidizing; uniformly adding 7.2g of hydrazine hydrate within 20 min; starting an electric heating switch of the water bath kettle to start heating, setting the heating temperature to be 90 ℃, and heating for 180 min; supplementing water in the reaction process, and maintaining the solution amount in the beaker to be 435 ml; and (4) after the reaction is finished, closing the heating switch, stopping stirring, and performing solid-liquid separation to obtain 425ml of vanadyl sulfate solution and trace residues.
The analysis result shows that the vanadyl sulfate (VOSO) of the vanadyl sulfate solution4) The content is 32.8 percent, the solution density is 1.46g/ml, and the vanadium recovery rate is 99.92 percent.
Claims (9)
1. The preparation method of the vanadyl sulfate solution for regenerating the inactivated denitration catalyst is characterized by comprising the following steps of: ammonium vanadate and water are pulped, acidized by sulfuric acid, reduced by a reducing agent, and solid-liquid separation is carried out, so that vanadyl sulfate solution and residues are obtained.
2. The method for preparing vanadyl sulfate solution for regenerating deactivated denitration catalyst according to claim 1, wherein: the ammonium vanadate is ammonium metavanadate and/or ammonium polyvanadate.
3. The method for preparing a vanadyl sulfate solution for regenerating a deactivated denitration catalyst according to claim 2, wherein: the weight volume ratio of the ammonium vanadate to the water is 100 g: 400-520 ml; preferably, the weight volume ratio of the ammonium metavanadate to the water is 100 g: 400-430 ml, wherein the weight volume ratio of the ammonium polyvanadate to the water is 100 g: 490-520 ml.
4. The method for preparing a vanadyl sulfate solution for regenerating a deactivated denitration catalyst according to claim 2, wherein: the weight ratio of the sulfuric acid to the ammonium vanadate is 11-13: 10; preferably, the weight ratio of the sulfuric acid to the ammonium metavanadate is 12-13: 10, the weight ratio of the sulfuric acid to the ammonium polyvanadate is 11-12: 10.
5. the method for producing the vanadyl sulfate solution for regenerating the deactivated denitration catalyst according to any one of claims 1 to 4, wherein: the mass fraction of the sulfuric acid is more than or equal to 95 percent; preferably, the mass fraction of the sulfuric acid is more than or equal to 98 percent.
6. The method for preparing a vanadyl sulfate solution for regenerating a deactivated denitration catalyst according to claim 2, wherein: the reducing agent is one or more than two of oxalic acid, tartaric acid or hydrazine hydrate; preferably, the reducing agent is oxalic acid.
7. The method for preparing a vanadyl sulfate solution for regenerating a deactivated denitration catalyst according to claim 6, wherein: the weight ratio of the reducing agent to the ammonium vanadate is 6-65: 100, respectively; preferably, the weight ratio of the oxalic acid to the ammonium metavanadate is 53-55: 100, respectively; the weight ratio of the oxalic acid to the ammonium polyvanadate is 63-65: 100, respectively; the weight ratio of the tartaric acid to the ammonium metavanadate is 12-14: 100, respectively; the weight ratio of the tartaric acid to the ammonium polyvanadate is 14.5-16.5: 100, respectively; the weight ratio of the ammonium metavanadate to the hydrazine hydrate is 6-8: 100, respectively; the weight ratio of the ammonium polyvanadate to the hydrazine hydrate is 7.5-9.5: 100.
8. the method for preparing vanadyl sulfate solution for regenerating deactivated denitration catalyst according to claim 1, wherein: the reduction temperature is 50-90 ℃; the reduction time is 60-180 min.
9. The method for preparing a vanadyl sulfate solution for regenerating a deactivated denitration catalyst according to claim 1, wherein: and the stirring speed during pulping, acidifying and reducing is 200-350 r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910911253.7A CN112551577A (en) | 2019-09-25 | 2019-09-25 | Preparation method of vanadyl sulfate solution for regeneration of inactivated denitration catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910911253.7A CN112551577A (en) | 2019-09-25 | 2019-09-25 | Preparation method of vanadyl sulfate solution for regeneration of inactivated denitration catalyst |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112551577A true CN112551577A (en) | 2021-03-26 |
Family
ID=75029334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910911253.7A Pending CN112551577A (en) | 2019-09-25 | 2019-09-25 | Preparation method of vanadyl sulfate solution for regeneration of inactivated denitration catalyst |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112551577A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745246A (en) * | 2016-11-11 | 2017-05-31 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method for preparing vanadic sulfate |
| CN108336426A (en) * | 2018-02-07 | 2018-07-27 | 四川星明能源环保科技有限公司 | The preparation method and its oxygen vanadium sulfate crystals obtained of a kind of vanadic sulfate |
-
2019
- 2019-09-25 CN CN201910911253.7A patent/CN112551577A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745246A (en) * | 2016-11-11 | 2017-05-31 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method for preparing vanadic sulfate |
| CN108336426A (en) * | 2018-02-07 | 2018-07-27 | 四川星明能源环保科技有限公司 | The preparation method and its oxygen vanadium sulfate crystals obtained of a kind of vanadic sulfate |
Non-Patent Citations (1)
| Title |
|---|
| 杨宝详: "《钒基材料制造》", 31 March 2014 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2010143126A (en) | METHOD FOR PRODUCING VANADIUM OXIDE USING EXTRACTION | |
| CN104164569A (en) | Method for preparing vanadium pentoxide by leaching vanadium slag with ammonium salt | |
| CN104003443A (en) | Method for preparing ammonium metavanadate by adding seed crystals | |
| KR20120041208A (en) | Process for preparing ammonium metatungstate | |
| CN114231758B (en) | Vanadium pentoxide, and ammonium-free preparation method and application thereof | |
| CN114014294A (en) | Method for preparing lithium iron phosphate by using pyrite and lithium iron phosphate material | |
| CN111068732A (en) | Hydrogen peroxide decomposition catalyst and application thereof in semiconductor waste acid treatment | |
| CN110331297B (en) | Method for preparing vanadium pentoxide from vanadium slag in short process | |
| CN112551577A (en) | Preparation method of vanadyl sulfate solution for regeneration of inactivated denitration catalyst | |
| CN109628765B (en) | Method for recovering VPO catalyst | |
| CN114672668B (en) | Method for preparing vanadium pentoxide by reducing precipitated vanadium and vanadium pentoxide and application | |
| CN111495354A (en) | Method for preparing catalyst by leaching waste vanadium catalyst | |
| CN116102211A (en) | Method for treating synthesis wastewater of battery anode material precursor | |
| CN113930629A (en) | Method for treating crystallization mother liquor of calcification vanadium precipitation process | |
| CN108129290A (en) | A kind of method of sulfate radical in removal lactic acid | |
| CN113860378A (en) | Method for producing high-purity manganese sulfate by using hydroxyl combined liquid phase reduction treatment manganese oxide ore | |
| CN107617445B (en) | Method for preparing cobalt-manganese-bromine aqueous solution by utilizing recovered cobalt and manganese | |
| CN112174204A (en) | Method for producing vanadium pentoxide by using waste VPO catalyst | |
| CN116282183B (en) | Efficient preparation method of potassium permanganate | |
| CN112978796A (en) | Method for cleanly preparing vanadium pentoxide from sodium vanadate solution | |
| CN112320847A (en) | Method for extracting vanadium from high-phosphate vanadium solution and recycling wastewater | |
| CN112126784A (en) | Method for recovering vanadium and chromium resources from vanadium and chromium sludge | |
| CN111172410A (en) | Short-process vanadium extraction method | |
| CN104934587B (en) | The method for preparing new energy battery-active electrode material using ilmenite traditional handicraft | |
| CN117623385A (en) | Method for preparing vanadium pentoxide by using organic amine flue gas desulfurization slag |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210326 |