CN104326506A - Method for recovering titanium dioxide in spent denitrification catalyst - Google Patents
Method for recovering titanium dioxide in spent denitrification catalyst Download PDFInfo
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Abstract
The invention discloses a method for recovering titanium dioxide in a spent denitrification catalyst, which comprises the following steps: (1) grinding: grinding a spent denitrification catalyst into powder, putting in an open container, and dropwisely adding a right amount of distilled water into the open container to prevent scaling; (2) acidolysis: adding 98 wt% concentrated sulfuric acid into the open container, heating the open container to dissolve the powder while continuously stirring to perform uniform solid-liquid mixing, stopping heating when the solution in the open container becomes brown yellow, and cooling to not more than 30 DEG C to obtain a titanium solution; (3) neutralization: dropwisely adding an 80 lime milk solution containing 50-80 wt% of active calcium into the titanium solution while shaking uniformly, controlling the temperature of the titanium solution at not more than 70 DEG C, sufficiently reacting, and cooling to room temperature; (4) concentration and hydrolysis: concentrating the neutralized titanium solution to 195-205 g/L, adding a crystal seed, and heating for hydrolysis; (5) filtering and rinsing; and (6) drying and calcining.
Description
Technical field
The present invention relates to the recovery method of titanium dioxide, particularly relating to the method for reclaiming titanium dioxide in inefficacy denitrating catalyst.
Background technology
Denitrating catalyst specific surface area is large, and catalytic activity is high, stable chemical nature, long service life, and denitrating catalyst titanium dioxide is the solid support material of SCR denitration, mainly reduction of nitrogen oxide, is specifically designed to power plant, oil refining, the tail gas denitration of the factories such as coking.And denitrating catalyst generally inactivation or catalytic efficiency will significantly reduce the index request that cannot meet denitration or in use poison deactivation in use after 3 years.Now denitrating catalyst must instantaneously changing, and the main path of spent catalyst disposal and utilization under changing has:
1) landfill disposal
In the U.S., because the catalyzer lost efficacy contains hazard component (V2O5), catalyzer must process in the danger wastes landfill disposal factory secured permission.
2) catalyzer retailer is returned to
The catalyzer lost efficacy also can return to catalyzer retailer, is responsible for handling failure catalyzer by it.
3) as cement raw material or aggregate
The catalyzer lost efficacy may be used as the aggregate of cement raw material or concrete and other road-making material.
4) rear and coal multifuel combustion is ground
Mix after the catalyzer lost efficacy grinding with fire coal, feeding coal-fired plant boiler burns.Catalystic material after pyrolysis is disposed together with flyash.
Along with fuel-burning power plant SCR denitration project is built on a large scale, the amount of spent catalyst will sharply increase, effective means is not also had to reclaim with the titanium dioxide reclaimed wherein by spent catalyst at present, cause a large amount of wastes, Chinese invention patent notification number CN1285743 discloses one " from the material containing titanium dioxide as reclaimed the method for titanium dioxide copper smelter slag ", milled titanium dioxide raw material, this particulate state original feed and sulfuric acid are reacted under prescribed conditions, dissolve and filter the gained cake containing titanyl sulfate, hydrolysing titanyl sulfate, and after washing water hydrolysis products, calcine this hydrolysate, to obtain titanium dioxide, Chinese invention patent publication No. CN103962189A discloses " catalyzer of a kind of waste and old SCR catalyst recovery method, recovery and rinsing liquid and preparation thereof ", and the scavenging solution utilizing isomery C13 fatty alcohol-polyoxyethylene ether emulsifying agent and hydrofluoric acid to make also adopts ultrasonic cleaning method to achieve effective cleaning of waste and old honeycomb fashion SCR catalyst, by waste and old honeycomb fashion SCR catalyst is carried out fragmentation, cleaning, grinding, and mix with titanium dioxide, tungstic oxide, glass fibre, Vanadium Pentoxide in FLAKES, the waste and old SCR catalyst making to continue to use become live catalyst produce in a kind of material, be achieved cycling and reutilization, Chinese invention patent notification number CN103130265B discloses " a kind of method of recovery Pd white powder from waste and old SCR denitration ", first useless denitrating catalyst is carried out to dedusting, pulverizes abrasive dust, then add the vitriol oil and obtain titanyl sulfate strong solution by after its acidolysis, then thin up, then add nonionic emulsifier as flocculation agent, sulfosalt surfactant or polycarboxylate tensio-active agent, as coagulant aids, then add Water-soluble methyl silicone oil, pump into plate-and-frame filter press again and carry out press filtration, reheat concentrated for filter vacuum to 90 DEG C-98 DEG C and keep filtrate being hydrolyzed in 5.5 hours, then hydrolysate is cooled to 40 DEG C, carries out vacuum filtration and metatitanic acid is deposited, after using sand leaching water and rinsed with deionized water again, add salt of wormwood or phosphoric acid obtains metatitanic acid filter cake, calcine at 500-800 DEG C after filter cake is dried, then pulverize, levigately obtain finished titanium dioxide, but these three kinds of method complex operations, not high to the rate of recovery of titanium dioxide, have early stage hydrolysis in acid hemolysis process, and the stability of the titanium liquid obtained after these three kinds of method acidolysis is too low.
Summary of the invention
The technical problem to be solved in the present invention is the method complex operation of titanium dioxide in existing recovery inefficacy denitrating catalyst, what relate to is reacted many, need the chemical substance of interpolation more, cost is higher, not high to the rate of recovery of titanium dioxide, a kind of method for reclaiming titanium dioxide in inefficacy denitrating catalyst is provided for this reason.
Technical scheme of the present invention is: for reclaiming the method for titanium dioxide in inefficacy denitrating catalyst, it comprises the following steps: (1), grinding, out of stock for inefficacy catalyzer is ground to and is Powderedly placed in open container, in open container, drip appropriate distilled water prevent from tying the end; (2), acidolysis, will with lost efficacy out of stock catalyst weight than being (2-4): the massfraction of 1 be 98% the vitriol oil add open container, powder dissolution is made to open container heating, in heat-processed, Keep agitation makes solid-liquid mix, when the solution in open container is brown color stop heating, be cooled to≤30 DEG C obtain titanium liquid; (3), neutralize, the lime milk solution being 80% by massfraction 50%-80% Calcium of intensifiens content is dropwise added drop-wise in titanium liquid, and dropping limit, limit shakes up, and controls titanium liquid temp≤70 DEG C, is fully cooled to room temperature after reaction; (4), concentrate hydrolysis, the titanium liquid after neutralization is concentrated into 195-205g/l, adds crystal seed heating hydrolysis; (5), rinsing is filtered; (6), calcining is dried.
In such scheme, in step (3), the massfraction of lime milk solution is 60%.
The improvement of such scheme is that pressurization pressure is 2-4MPa, and temperature controls to maintain 1-3h at 0-7 DEG C first through compressed cryogenic process before the middle out of stock catalyzer grinding of losing efficacy of step (1).
In step described in such scheme (1), the median size of the out of stock catalyzer grinding of Powdered inefficacy is 5.3-6.2nm.
The invention has the beneficial effects as follows the titanium dioxide that effectively can reclaim more than 85% content in inefficacy denitrating catalyst, and it is low to reclaim supplementary material cost used, technique change amplitude is little; Accomplish the recycling again of titanium, significantly can reduce production cost; Only original hydrolysis procedure need be changed by a small margin, Production requirement of the present invention can be met; Stop immediately after the out of stock catalyst fines that lost efficacy dissolves completely heat and cool, temperature controls temperature in≤30 DEG C and step (3) and controls titanium liquid can be avoided to occur to be hydrolyzed in early days at≤70 DEG C in step (2); In when the massfraction of lime milk solution is 60% and efficiency best, early stage hydrolysis can not be produced and titanium liquid small volume reduces energy consumption to the enrichment process in later stage; Low with the product cost that this technology is produced, product is more easy to control in stability, F value, total titanium concentration index, supplementary material aboundresources and cheap, has wide market outlook and development potentiality.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
Embodiment 1:(1), grinding, taking 40 weight parts be that the out of stock catalyzer of cellular inefficacy is ground to and is Powderedly placed in open container, drips 10ml distilled water wetting powder and prevent the knot end in open container; (2), acidolysis, by the massfraction of 80 weight parts be 98% the vitriol oil add open container, open container is placed on electric furnace and heats, make powder dissolution, in heat-processed, Keep agitation makes solid-liquid mix, when the solution in open container is brown color stop heating, treat solution be cooled to≤30 DEG C obtain titanium liquid; (3), neutralization, get massfraction 60% Calcium of intensifiens content be 80% lime milk solution 52ml be dropwise added drop-wise in titanium liquid, dropping limit, limit shakes up, and controls titanium liquid temp≤70 DEG C, is fully cooled to room temperature after reaction; (4), concentrate hydrolysis, the titanium liquid after neutralization is concentrated into 200g/l, adds crystal seed heating hydrolysis; (5), rinsing is filtered; (6), calcining is dried.
Embodiment 2:(1), grinding, taking 40 weight parts be that the out of stock catalyzer of cellular inefficacy is ground to and is Powderedly placed in open container, drips 10ml distilled water wetting powder and prevent the knot end in open container; (2), acidolysis, by the massfraction of 100 weight parts be 98% the vitriol oil add open container, open container is placed on electric furnace and heats, make powder dissolution, in heat-processed, Keep agitation makes solid-liquid mix, when the solution in open container is brown color stop heating, treat solution be cooled to≤30 DEG C obtain titanium liquid; (3), neutralization, get massfraction 60% Calcium of intensifiens content be 80% lime milk solution 97ml be dropwise added drop-wise in titanium liquid, dropping limit, limit shakes up, and controls titanium liquid temp≤70 DEG C, is fully cooled to room temperature after reaction; (4), concentrate hydrolysis, the titanium liquid after neutralization is concentrated into 200g/l, adds crystal seed heating hydrolysis; (5), rinsing is filtered; (6), calcining is dried.
Embodiment 3:(1), grinding, taking 40 weight parts be that the out of stock catalyzer of cellular inefficacy is ground to and is Powderedly placed in open container, drips 10ml distilled water wetting powder and prevent the knot end in open container; (2), acidolysis, by the massfraction of 120 weight parts be 98% the vitriol oil add open container, open container is placed on electric furnace and heats, make powder dissolution, in heat-processed, Keep agitation makes solid-liquid mix, when the solution in open container is brown color stop heating, treat solution be cooled to≤30 DEG C obtain titanium liquid; (3), neutralization, get massfraction 60% Calcium of intensifiens content be 80% lime milk solution 140ml be dropwise added drop-wise in titanium liquid, dropping limit, limit shakes up, and controls titanium liquid temp≤70 DEG C, is fully cooled to room temperature after reaction; (4), concentrate hydrolysis, the titanium liquid after neutralization is concentrated into 200g/l, adds crystal seed heating hydrolysis; (5), rinsing is filtered; (6), calcining is dried.
Embodiment 4:(1), grinding, taking 40 weight parts be that the out of stock catalyzer of cellular inefficacy is ground to and is Powderedly placed in open container, drips 10ml distilled water wetting powder and prevent the knot end in open container; (2), acidolysis, by the massfraction of 140 weight parts be 98% the vitriol oil add open container, open container is placed on electric furnace and heats, make powder dissolution, in heat-processed, Keep agitation makes solid-liquid mix, when the solution in open container is brown color stop heating, treat solution be cooled to≤30 DEG C obtain titanium liquid; (3), neutralization, get massfraction 60% Calcium of intensifiens content be 80% lime milk solution 185ml be dropwise added drop-wise in titanium liquid, dropping limit, limit shakes up, and controls titanium liquid temp≤70 DEG C, is fully cooled to room temperature after reaction; (4), concentrate hydrolysis, the titanium liquid after neutralization is concentrated into 200g/l, adds crystal seed heating hydrolysis; (5), rinsing is filtered; (6), calcining is dried.
Embodiment 5:(1), grinding, taking 40 weight parts be that the out of stock catalyzer of cellular inefficacy is ground to and is Powderedly placed in open container, drips 10ml distilled water wetting powder and prevent the knot end in open container; (2), acidolysis, by the massfraction of 160 weight parts be 98% the vitriol oil add open container, open container is placed on electric furnace and heats, make powder dissolution, in heat-processed, Keep agitation makes solid-liquid mix, when the solution in open container is brown color stop heating, treat solution be cooled to≤30 DEG C obtain titanium liquid; (3), neutralization, get massfraction 60% Calcium of intensifiens content be 80% lime milk solution 230ml be dropwise added drop-wise in titanium liquid, dropping limit, limit shakes up, and controls titanium liquid temp≤70 DEG C, is fully cooled to room temperature after reaction; (4), concentrate hydrolysis, the titanium liquid after neutralization is concentrated into 200g/l, adds crystal seed heating hydrolysis; (5), rinsing is filtered; (6), calcining is dried.
Embodiment 6:(1), grinding, taking 40 weight parts be that the out of stock catalyzer of cellular inefficacy is ground to and is Powderedly placed in open container, drips 10ml distilled water wetting powder and prevent the knot end in open container; (2), acidolysis, by the massfraction of 100 weight parts be 98% the vitriol oil add open container, open container is placed on electric furnace and heats, make powder dissolution, in heat-processed, Keep agitation makes solid-liquid mix, when the solution in open container is brown color stop heating, treat solution be cooled to≤30 DEG C obtain titanium liquid; (3), neutralization, get massfraction 50% Calcium of intensifiens content be 80% lime milk solution 115ml be dropwise added drop-wise in titanium liquid, dropping limit, limit shakes up, and controls titanium liquid temp≤70 DEG C, is fully cooled to room temperature after reaction; (4), concentrate hydrolysis, the titanium liquid after neutralization is concentrated into 200g/l, adds crystal seed heating hydrolysis; (5), rinsing is filtered; (6), calcining is dried.
Embodiment 7:(1), grinding, taking 40 weight parts be that the out of stock catalyzer of cellular inefficacy is ground to and is Powderedly placed in open container, drips 10ml distilled water wetting powder and prevent the knot end in open container; (2), acidolysis, by the massfraction of 100 weight parts be 98% the vitriol oil add open container, open container is placed on electric furnace and heats, make powder dissolution, in heat-processed, Keep agitation makes solid-liquid mix, when the solution in open container is brown color stop heating, treat solution be cooled to≤30 DEG C obtain titanium liquid; (3), neutralization, get massfraction 70% Calcium of intensifiens content be 80% lime milk solution 82ml be dropwise added drop-wise in titanium liquid, dropping limit, limit shakes up, and controls titanium liquid temp≤70 DEG C, is fully cooled to room temperature after reaction; (4), concentrate hydrolysis, the titanium liquid after neutralization is concentrated into 200g/l, adds crystal seed heating hydrolysis; (5), rinsing is filtered; (6), calcining is dried.
Embodiment 8:(1), grinding, taking 40 weight parts be that the out of stock catalyzer of cellular inefficacy is ground to and is Powderedly placed in open container, drips 10ml distilled water wetting powder and prevent the knot end in open container; (2), acidolysis, by the massfraction of 100 weight parts be 98% the vitriol oil add open container, open container is placed on electric furnace and heats, make powder dissolution, in heat-processed, Keep agitation makes solid-liquid mix, when the solution in open container is brown color stop heating, treat solution be cooled to≤30 DEG C obtain titanium liquid; (3), neutralization, get massfraction 80% Calcium of intensifiens content be 80% lime milk solution 72ml be dropwise added drop-wise in titanium liquid, dropping limit, limit shakes up, and controls titanium liquid temp≤70 DEG C, is fully cooled to room temperature after reaction; (4), concentrate hydrolysis, the titanium liquid after neutralization is concentrated into 200g/l, adds crystal seed heating hydrolysis; (5), rinsing is filtered; (6), calcining is dried.
The titanium liquid suction filtration of each embodiment after step (3) and (4) is got filtrate for 2 times to be settled to 300mL and to be analyzed as follows table:
| Embodiment | Effective acid content (g/L) | Total titanium concentration (g/L) | F value | Stability |
| Embodiment 1 | 212 | 65 | 3.26 | 1000 |
| Embodiment 2 | 204 | 105 | 1.94 | 450 |
| Embodiment 3 | 198 | 84 | 2.36 | 500 |
| Embodiment 4 | 191 | 79 | 2.41 | 800 |
| Embodiment 5 | 197 | 76 | 2.59 | 900 |
| Embodiment 6 | 198 | 102 | 1.94 | 430 |
| Embodiment 7 | 186 | 92 | 2.02 | 510 |
| Embodiment 8 | 179 | 82 | 2.18 | 550 |
When can find out that sulfuric acid is 2.5 with the ratio of the out of stock catalyzer that lost efficacy by embodiment 1,2 contrast, level of response is the most thorough; Being contrasted by test 2,3,4,5 to draw when this ratio tunes up, in titanium liquid filtration procedure after the neutralization because in and the increase of the quantity of slag cause the residual titanium be mixed with in filter residue to increase, the total titanium content of titanium liquid after making is too low, and F value is higher, cannot normally be hydrolyzed.
By embodiment 2,6 contrast can draw during lime milk concentration is when 50% and 60% and efficiency be similar to, titanium liquid index afterwards is also similar to.But in actual production after suction filtration completes without the need to constant volume, therefore when using the lime slurry of 50%, whole liquor capacity is comparatively large, and add burden to enrichment process afterwards, energy consumption also can become large.Therefore lime milk concentration functional quality mark is 60% for best.
As can be seen from the total titanium concentrations versus of embodiment 2,7,8, the total titanium content of the increase along with lime milk concentration but decreases, this is because lime milk concentration is higher, neutralization reaction then Shaoxing opera is strong, and exothermic heat of reaction is larger, the temperature of wayward whole solution.Thus the early stage hydrolysis of part is created.Hydrolysis metatitanic acid because water insoluble and in suction filtration process with in be removed together with slag.
Stability after concentrated by embodiment 1,2,3,4,5,6,7,8 contrasts can find out that the dense titanium liquid stability using this technology to produce is all higher and stable, but the stability of titanium liquid is too high be unfavorable for after hydrolysis, therefore test 2,6 stability be more suitable for after hydrolyzing process.
The preferred embodiments of the present invention 9 are that to the process of inefficacy out of stock catalyzer compressed cryogenic, pressurization pressure is 2MPa, and temperature controls to maintain 1h at 0 DEG C first through pre-treating technology before the middle out of stock catalyzer grinding of losing efficacy of step (1); Other step operates as described in embodiment 1-8.
Preferred embodiment 10 is that to the process of inefficacy out of stock catalyzer compressed cryogenic, pressurization pressure is 4MPa, and temperature controls to maintain 3h at 7 DEG C, and other step operates as described in embodiment 1-8 first through pre-treating technology before the middle out of stock catalyzer grinding of losing efficacy of step (1); Titania molecule in the out of stock catalyzer of the inefficacy that such one side obtains can be reunited together to greatest extent, the impurity lost efficacy in out of stock catalyzer effectively can be removed, as Na, K ion, carbon distribution etc. cause the objectionable constituent of out of stock catalyst failure when carrying out acidolysis; The out of stock catalyzer of inefficacy on the other hand after high pressure low temperature process is easy to be ground into the less powder of particle diameter, and the median size of the out of stock catalyst fines that lost efficacy when acidolysis will control at 5.3-6.2nm, otherwise the out of stock catalyst fines that lost efficacy not easily dissolves completely, have precipitation to produce, experimental data sees the following form:
| Pre-treating technology | Impurities removing efficiency | Median size |
| Nothing | 0 | 13nm |
| Pressure 2Mpa, temperature 0 DEG C, continues 1h | 75% | 5.6nm |
| Pressure 3Mpa, temperature 5 DEG C, continues 2h | 80% | 6.2nm |
| Pressure 4Mpa, temperature 7 DEG C, continues 3h | 73% | 5.3nm |
In the present invention titanium liquid be directly concentrated into 200 ± 5g/l just can start hydrolysis, just can start be hydrolyzed, without the need to titanous processed and freezing and crystallizing.
Claims (4)
1. for reclaiming the method for titanium dioxide in inefficacy denitrating catalyst, it is characterized in that it comprises the following steps: (1), grinding, be ground to out of stock for inefficacys catalyzer and be Powderedly placed in open container, in open container, dripping appropriate distilled water prevent the knot end; (2), acidolysis, will with lost efficacy out of stock catalyst weight than being (2-4): the massfraction of 1 be 98% the vitriol oil add open container, powder dissolution is made to open container heating, in heat-processed, Keep agitation makes solid-liquid mix, when the solution in open container is brown color stop heating, be cooled to≤30 DEG C obtain titanium liquid; (3), neutralize, the lime milk solution being 80% by massfraction 50%-80% Calcium of intensifiens content is dropwise added drop-wise in titanium liquid, and dropping limit, limit shakes up, and controls titanium liquid temp≤70 DEG C, is fully cooled to room temperature after reaction; (4), concentrate hydrolysis, the titanium liquid after neutralization is concentrated into 195-205g/l, adds crystal seed heating hydrolysis; (5), rinsing is filtered; (6), calcining is dried.
2. as claimed in claim 1 for reclaiming the method for titanium dioxide in inefficacy denitrating catalyst, it is characterized in that the massfraction of lime milk solution in described step (3) is 60%.
3. as claimed in claim 2 for reclaiming the method for titanium dioxide in inefficacy denitrating catalyst, it is characterized in that the middle out of stock catalyzer that lost efficacy of described step (1) before grinding first through compressed cryogenic process, pressurization pressure is 2-4MPa, and temperature controls to maintain 1-3h at 0-7 DEG C.
4. as claimed in claim 3 for reclaiming the method for titanium dioxide in inefficacy denitrating catalyst, it is characterized in that the median size of the out of stock catalyzer grinding of Powdered inefficacy in described step (1) is 5.3-6.2nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410564799.7A CN104326506B (en) | 2014-10-22 | For reclaiming the method for titanium dioxide in inefficacy denitrating catalyst |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410564799.7A CN104326506B (en) | 2014-10-22 | For reclaiming the method for titanium dioxide in inefficacy denitrating catalyst |
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| CN104326506A true CN104326506A (en) | 2015-02-04 |
| CN104326506B CN104326506B (en) | 2017-01-04 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104609753B (en) * | 2015-02-05 | 2016-08-24 | 郑志海 | Waste flue gas denitration catalyst harmless treatment process |
| CZ307609B6 (en) * | 2017-05-04 | 2019-01-09 | TESORO Spin off, s.r.o. | Process for preparing titanium catalysts |
| CN111974461A (en) * | 2020-03-03 | 2020-11-24 | 江苏龙清环境技术有限公司 | Induction reconstruction method of deactivated SCR denitration catalyst and regenerated SCR catalyst carrier |
| CN112299476A (en) * | 2020-11-13 | 2021-02-02 | 昆明理工大学 | Method for preparing titanium dioxide from high-acidity-value high-silicon-content titanium liquid |
| CN112919530A (en) * | 2019-12-06 | 2021-06-08 | 国家能源投资集团有限责任公司 | Mesoporous titanium dioxide material and preparation method thereof, catalyst and preparation method thereof, and flue gas denitration method |
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| CN1479795A (en) * | 2000-12-12 | 2004-03-03 | ¸ | Method for recovering titanium dioxide from titanium dioxide bearing materials like steel making slags |
| CN101172647A (en) * | 2007-10-19 | 2008-05-07 | 杨绍泉 | Method for producing gtitanium dioxide with sulphuric acid method |
| CN103130265A (en) * | 2013-03-18 | 2013-06-05 | 江苏万德环保科技有限公司 | Method for recycling titanium dioxide in waste SCR (Selective Catalytic Reduction) denitration catalyst |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1479795A (en) * | 2000-12-12 | 2004-03-03 | ¸ | Method for recovering titanium dioxide from titanium dioxide bearing materials like steel making slags |
| CN101172647A (en) * | 2007-10-19 | 2008-05-07 | 杨绍泉 | Method for producing gtitanium dioxide with sulphuric acid method |
| CN103130265A (en) * | 2013-03-18 | 2013-06-05 | 江苏万德环保科技有限公司 | Method for recycling titanium dioxide in waste SCR (Selective Catalytic Reduction) denitration catalyst |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104609753B (en) * | 2015-02-05 | 2016-08-24 | 郑志海 | Waste flue gas denitration catalyst harmless treatment process |
| CZ307609B6 (en) * | 2017-05-04 | 2019-01-09 | TESORO Spin off, s.r.o. | Process for preparing titanium catalysts |
| CN112919530A (en) * | 2019-12-06 | 2021-06-08 | 国家能源投资集团有限责任公司 | Mesoporous titanium dioxide material and preparation method thereof, catalyst and preparation method thereof, and flue gas denitration method |
| CN112919530B (en) * | 2019-12-06 | 2022-10-11 | 国家能源投资集团有限责任公司 | Mesoporous titanium dioxide material and preparation method thereof, catalyst and preparation method thereof, and flue gas denitration method |
| CN111974461A (en) * | 2020-03-03 | 2020-11-24 | 江苏龙清环境技术有限公司 | Induction reconstruction method of deactivated SCR denitration catalyst and regenerated SCR catalyst carrier |
| CN111974461B (en) * | 2020-03-03 | 2024-04-02 | 江苏龙清环境技术有限公司 | Method for inducing reconstruction of deactivated SCR denitration catalyst and regenerated SCR catalyst carrier |
| CN112299476A (en) * | 2020-11-13 | 2021-02-02 | 昆明理工大学 | Method for preparing titanium dioxide from high-acidity-value high-silicon-content titanium liquid |
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