CN104140082A - Method for recycling titanium dioxide waste acid - Google Patents
Method for recycling titanium dioxide waste acid Download PDFInfo
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- CN104140082A CN104140082A CN201410370860.4A CN201410370860A CN104140082A CN 104140082 A CN104140082 A CN 104140082A CN 201410370860 A CN201410370860 A CN 201410370860A CN 104140082 A CN104140082 A CN 104140082A
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Abstract
The invention provides a method for recycling titanium dioxide waste acid. A two-time acid mixing mode is adopted in the method. Primary acid mixing comprises the steps of controlling the mass percent of sulfuric acid in mixed acid to be 45 percent to 50 percent, and performing cooling, crystallizing, curing and solid-liquid separating to obtain primary acid mixing filtrate and concentrated slag. Secondary acid mixing comprises the steps of controlling the mass percent of sulfuric acid in mixed acid to be 60 percent to 65 percent, performing cooling, crystallizing, curing and settling separating to obtain concentrated acid liquor and thick slurry, and returning the thick slurry to a primary acid mixing station. By means of the method, concentrated acid with low impurity content and the concentrated slag with low acid content are obtained. The yield of sulfuric acid reaches 99.5 percent by means of the acid mixing mode, and the problem of poor quality of concentrated slag through a conventional method is solved. By means of the method for recycling the titanium dioxide waste acid, the technological process is simple, production cost and operation cost are quite low, the yield of waste acid is increased, quality of the concentrated slag is improved greatly, and recycling of the concentrated slag is promoted.
Description
Technical field
The present invention relates to a kind of recovery method of titanium white waste acid, is exactly a kind of recovery method of titanium dioxide waste acid by sulfuric acid process.
Background technology
Titanium dioxide is a kind of important Inorganic Chemicals, nontoxic, be harmless to the health, and is most important white pigment, accounts for 80% of whole white pigment usage quantitys.Titanium dioxide is considered at present the best a kind of white pigment of performance in the world, is widely used in the industry such as coating, plastics, papermaking, is the third-largest inorganic chemical product that is only second to synthetic ammonia and phosphoric acid.
Iron white powder industrial process mainly contains chlorination process and sulfuric acid process.Sulfuric acid process is ripe,, technology maturation low to the strong adaptability of titanium material, production cost, and it both can produce anatase titanium dioxide product, can produce rutile-type product again, was a kind of method generally adopting in existing titanium white production mode.But the every production of sulfuric acid process 1t titanium dioxide, need to consume sulfuric acid more than 4t, produce 6 ~ 8t concentration simultaneously and be 20% ~ 25% spent acid.In spent acid except containing main component H
2sO
4also contain certain FeSO outward,
4, TiO
2, A1
2(SO
4)
3, MgSO
4deng material.If the not treated direct discharge of these spent acid, contaminate environment not only, also causes the serious waste of resource.How processing these spent acid, reclaim economically wherein valuable part, become the important technology difficult problem that sulfate process titanium dioxide is produced, is also the significant problem of puzzlement environment protection and titanium dioxide industry development.Comparing at present the method for environmental protection, is that titanium white waste acid is concentrated, makes the impurity such as ferrous sulfate, crystallization from spent acid, thus greatly reduce the foreign matter content in spent acid, realize the recycle in titanium white device or produce the products such as phosphoric acid salt.
The concentration method of titanium white waste acid is more, as combustion gas method of enrichment, calcination method, vacuum concentration method, neutralisation, membrane filter method etc.Method of enrichment is that spent acid is concentrated, and improves the concentration of spent acid, reaches the object that can recycle.The concentration technique majority of spent acid is to utilize the direct method of enrichment of a kind of thermal source at present, and thermal source comprises Sweet natural gas, steam or coal-fired hot gas etc.CN1330562C by the concentrated mode of flue gas and steam secondary to waste acid concentration to sulfuric acid 55-60%.CN102079512B adopts two or three grades of vacuum concentration modes of one-level flash distillation, is concentrated into sulfuric acid 82%." in titanium white waste acid, the separation of ferrous sulfate and spent acid reclaim " adopts normal pressure concentration technology, and waste acid concentration is to 55-60%, and after separated ferrous sulfate, vacuum concentration is to 80-85%, and filter residue adopts clear water making beating reclaim(ed) sulfuric acid, and the filtrate after making beating is returned to concentration section.Adopt above method energy efficient recovery spent acid, have that technical process is long, equipment requirements is high, thickening equipment costliness, energy consumption, the difficult problem that operation and maintenance cost is high, can not avoid the scale formation of waste acid concentration process ferrous sulfate.Its concentrated cost is far above the price of the industrial vitriol oil.
Adopt complex acid technique to titanium white waste acid concentrate, in titanium white waste acid, add the sulfuric acid of high density, by improving sulfuric acid concentration, impel the sulphate crystal in spent acid to separate out, the spent acid purifying after concentrate is used for the sulfuric acid apparatus such as titanium dioxide acidolysis or phosphorus ore extraction.CN102515114A is directly increased to 64% sulfuric acid concentration by complex acid, the sulfuric acid after being purified, is used further to phosphorous chemical industry.CN101973530A adopts complex acid mode directly to obtain the sulfuric acid of 58-69%
.cN101774557A, adopts complex acid mode twice, a complex acid concentration 80-90%, secondary complex acid concentration 65-70%.Complex acid technique reclaims titanium white waste acid, technical process is simple, investment and productive expense extremely low, be a kind of comparatively suitable spent acid way of recycling, but adopt the free sulfuric acid content of above complex acid method gained condensed slag higher.
Titanium white waste acid is concentrated, with sulfuric acid concentration, improves, and separates out and take ferrous sulfate as main solid formation, is commonly called as condensed slag.The free sulfuric acid content of condensed slag is higher, and its processing mode is generally for sulfate system, mixes and fires standby sulfuric acid.It is agglomerating that the free sulfuric acid content height of condensed slag can cause condensed slag to adhere to, and mixes to burn and mix inhomogeneously, affects the stable control of acid-making process.The free acid content of condensed slag is high, and the meeting moisture absorption between staging life, produces sour water in bottom, also can have a strong impact on and mix burning process and production environment.In addition condensed slag free acid content is high, and mixing burning process, to decompose caloric receptivity large, causes mixing burning that temperature declines and fluidized bed is stablized and is subject to very big impact, thereby causes the burning amount of mixing of condensed slag to be subject to larger restriction.CN102372306A, condensed slag is prepared iron vitriol after adopting iron powder reducing to reduce sulfuric acid, and iron vitriol changes into ferrous sulfate monohydrate again and fires acid for mixing.Though solved the free acid of condensed slag to mixing the impact of burning, there is the difficult problem that technical process is long, production cost raises in it.
In sum, titanium white waste acid concentration is high, and the foreign matter content in acid is just low, is convenient to production reuse or for industries such as phosphorous chemical industry, but the sulfuric acid concentration of titanium white waste acid is high, and the free acid content of the condensed slag of generation is just high, has a strong impact on the processing of condensed slag.Under existing technique, titanium white waste acid reclaims and the quality of condensed slag becomes a difficult problem that is difficult to coordination.Recovery titanium white waste acid and the condensed slag of low-cost less energy-consumption, become the difficult problem that sulfuric acid method titanium pigment enterprise faces, and is also that the industry wishes to solve unsolved technical barrier always.
Summary of the invention
For solving the problems of the technologies described above, a kind of low-cost method that reclaims titanium white waste acid is provided, can be good at the retrieval of sulfuric acid in titanium white waste acid, the free sulfuric acid of the foreign matter content in gelled acid and condensed slag is extremely low simultaneously.
The present invention is achieved by the following technical solutions:
A recovery method for titanium white waste acid, comprises the following steps:
A, spent acid pre-concentration and titanium reclaim: utilize rotary kiln using waste heat from tail gas pre-concentration to 25%-32% titanium white waste acid, then reclaim titanium operation, obtain titanium white waste acid clear liquid;
B, a complex acid: the titanium white waste acid clear liquid that steps A is obtained, add the vitriol oil to mix, the mass percent of controlling sulfuric acid in nitration mixture is 45%-50%, then cooling, crystallization, slaking, solid-liquid separation, obtains complex acid filtrate and condensed slag;
C, secondary complex acid: the complex acid filtrate that step B is obtained, add the vitriol oil to mix, the mass percent of controlling sulfuric acid in nitration mixture is 60%-65%, then cooling, crystallization, slaking, settlement separate, obtain gelled acid clear liquid and thick oar, thick slurry is back to Yi Ci complex acid workshop section.
Condensed slag can directly be mixed and fire acid or prepare bodied ferric sulfate to sulfuric acid apparatus because sulfuric acid content is low, and clear liquid is that the spent acid that foreign matter content is low can directly be back to the workshop sections such as titanium dioxide acidolysis workshop section or phosphorus ore extraction.
Contriver finds by long-term experimental study, between the solubleness of the salts such as ferrous sulfate in sulphuric acid soln and sulfuric acid concentration, there is a kind of corresponding relation, raising along with sulfuric acid concentration, its solubleness reduces gradually, but sulfuric acid concentration should not be too high, this is because sulfuric acid concentration is high, viscosity strengthens, be unfavorable for solid-liquid separation, the condensed slag free sulfuric acid content producing is higher, therefore the sulfuric acid concentration in general control titanium white waste acid is between 50 ~ 55%, with this understanding, the clearance of ferrous salt reaches more than 80%, and ferrous content is down to 0.4 ~ 0.6%.The free sulfuric acid content of condensed slag raises with the rising of sulfuric acid concentration in spent acid.The free sulfuric acid content of condensed slag raises, and will have a strong impact on the subsequent processes of condensed slag and the yield of concentration process sulfuric acid.
When sulfuric acid concentration is higher, because containing a certain amount of titanyl sulfate in titanium white waste acid, it can cause vitriol in the time of 50-80 ℃, existence breaks out nucleation, and sulfuric acid concentration is higher, breaks out nucleation just more serious, cause the crystallization of condensed slag tiny, free sulfuric acid content is higher, thus need to control suitable sulfuric acid concentration to reduce the free sulfuric acid content of condensed slag, so under general condition during waste acid concentration sulfuric acid concentration be 50-55%.
Contriver is by under different titanium white waste acid concentration, and morphological research and the analytical data of crystallization vitriol learn, the crystallization of vitriol exists notable difference because of the difference of processing parameter.From the control of nucleus generation and crystal growing process, titanium white waste acid adopts complex acid mode to be obviously better than directly concentrating mode.Under suitable complex acid concentration, adopt complex acid mode to reclaim titanium white waste acid, early stage, temperature was higher, without vitriol, separated out, and the vitriol in process of cooling in titanium white waste acid reduces and separates out gradually with temperature, with sulfuric acid concentration, raises, and the free sulfuric acid content of condensed slag raises.The titanium white waste acid aggregate that directly the concentrated condensed slag producing is tiny vitriol, is cellular, and surface pore is extremely many, and free sulfuric acid content is high.It is the aggregate of column or granular vitriol that titanium white waste acid directly adopts complex acid mode (complex acid) to produce condensed slag, surface pore is more, free sulfuric acid content is higher, raising along with complex acid concentration, the column forming or the aggregate particle size of granular vitriol diminish, and it is large that specific surface area becomes, and the sulfuric acid amount of absorption increases, cause the free sulfuric acid content of condensed slag to raise, filtering separation difficulty.The condensed slag that adopts secondary complex acid of the present invention to produce is column or drop sulfur hydrochlorate crystalline aggregate, and surface pore is less, and specific surface area diminishes relatively, and the sulfuric acid amount of absorption is less, thereby the free sulfuric acid content of condensed slag is lower.Adopt secondary complex acid, acid concentration is lower than 45% time, and the concentrated quantity of slag of generation is less, and the iron level in spent acid is higher, and the quantity of slag that causes secondary complex acid to form is more, increases to the thick slurry amount of a complex acid, and systemic circulation amount increases, and has a strong impact on production efficiency.Further adopt secondary complex acid mode, improve the concentration of complex acid to 65-70%, add sulfuric acid, have turbid phenomenon to occur, the crystal accumulation body of the condensed slag of formation diminishes, filtration difficulty, and free sulfuric acid content raises.The spent acid of arrived 65-70% is improved to concentration to 85-90%, form the sulphuric acid soln of white opacity shape, at all cannot sedimentation, long-term systemic circulation, easily causes line clogging.
Preferably, in step C, add system content 5-10ppm flocculation agent.Suitable flocculation agent adds and is conducive to auxiliary settlement separately, reduces the sulfuric acid content in condensed slag.
Preferably, the rate of cooling in step B, C is 5-10 ℃/h, and the curing time is 1-3h.Because ferrous sulfate forms at the process experience crystal seed of crystallization, crystal growth process, temperature and time is very important to the growth of crystal, applicant finds by great many of experiments, when cooling gradient is at 5-10 ℃/h, during the time 1-3h of slaking, the crystallization effect of ferrous sulfate is better, more easily forms column crystallization or granular crystal polymer, and in ferrous sulfate, sulfuric acid content is lower.
Preferably, the cooling final temperature in step B, C is 60-65 ℃.By considering the effect of crystallization effect, filtration, obtain filtration temperature.
Beneficial effect of the present invention: avoided titanium white waste acid in concentrated process, vitriol mass crystallization is separated out fouling and the blockage problem of the e-quipment and pipe causing, work-ing life and the maintenance cycle of equipment have been extended, there is acid recovering rate high, condensed slag free sulfuric acid content is extremely low, the simple advantage for the treatment of process.The present invention is by secondary complex acid mode, the gelled acid of low impurity content and the condensed slag of low free acid content have been obtained, it is a kind of extremely excellent titanium white waste acid processing mode, it has avoided equipment scaling, technique is simple, and production cost is extremely low, has improved utilization ratio and the yield of spent acid, improve greatly the quality of condensed slag, promoted the recycle of condensed slag.
Accompanying drawing explanation
Fig. 1 be in gelled acid iron level with acid concentration change curve.
Fig. 2 be in condensed slag acid content with acid concentration change curve.
Fig. 3 is technical process block diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the invention will be further described.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
embodiment 1
By the spent acid in production process of titanium pigment, its main component, counts: H in mass ratio
2sO
420.51%, FeSO
49.13%, Al
2(SO
4)
30.66% MgSO
42.16%, TiO
20.36%, through countercurrent spray rotary kiln calcining tail gas, utilize the waste heat concentrate of calcining tail gas to H
2sO
425%, then reclaim after metatitanic acid by flocculating settling, limpid spent acid obtained; Spent acid is joined in a complex acid groove, more slowly to add sulfuric acid massfraction be 98% the vitriol oil, the spent acid of every 5t 28% adds the 1.33t vitriol oil, and the two mixes, and obtains nitration mixture.Then carry out Slow cooling cooling, slaking, the speed of cooling is 8 ℃/h, 60 ℃ of terminal temperatures, be cooled to terminal temperature post curing 1h, whole nitration mixture are squeezed into pressure filter and are carried out solid-liquid separation, and separation obtains complex acid filtrate one time, its sulfuric acid massfraction is 48.14%, iron level massfraction is 1.04%, and the condensed slag Free Sulfuric Acid massfraction obtaining is 8.43%, and condensed slag is mixed and fired standby sulfuric acid or bodied ferric sulfate production for sand acid.It is 98% the vitriol oil that complex acid filtrate adds sulfuric acid massfraction more fast, a complex acid filtrate of every 5t 48% adds the 1.5t vitriol oil, cooling and slaking condition are with a complex acid, slaking finishes, and adding system content is the flocculation agent of 5ppm, after settlement separate 30min, obtain secondary complex acid clear liquid, its sulfuric acid massfraction is 61.09%, and iron level massfraction is 0.19%, and this acid is for titanium dioxide acidolysis or phosphorous chemical industry extraction Deng Yongsuan workshop section.Thick slurry is back to Yi Ci complex acid workshop section and continues complex acid.The rate of recovery of complex acid process sulfuric acid reaches 97.30%.
embodiment 2
By the spent acid in production process of titanium pigment, its main component, counts: H in mass ratio
2sO
420.51%, FeSO
49.13%, Al
2(SO
4)
30.66% MgSO
42.16%, TiO
20.36%, through countercurrent spray rotary kiln calcining tail gas, utilize the waste heat concentrate of calcining tail gas to H
2sO
428%, then reclaim after metatitanic acid by flocculating settling, limpid spent acid obtained; Spent acid is joined in a complex acid groove, more slowly to add sulfuric acid massfraction be 98% the vitriol oil, the spent acid of every 5t 28% adds the 1.53t vitriol oil, and the two mixes, and obtains nitration mixture.Then carry out Slow cooling cooling, slaking, the speed of cooling is 8 ℃/h, and 60 ℃ of terminal temperatures are cooled to terminal temperature post curing 2h, and whole nitration mixture are squeezed into pressure filter and carried out solid-liquid separation, and separation obtains complex acid filtrate one time.Its sulfuric acid massfraction is 50.00%, and iron level massfraction is 0.85%, and the condensed slag Free Sulfuric Acid massfraction obtaining is 8.64%, and condensed slag is mixed and fired standby sulfuric acid or bodied ferric sulfate production for sand acid.It is 98% the vitriol oil that complex acid filtrate adds sulfuric acid massfraction more fast, a complex acid filtrate of every 5t 50% adds the 1.73t vitriol oil, cooling and slaking condition are with a complex acid, slaking finishes, and adding system content is 5ppm flocculation agent, after settlement separate 30min, obtain secondary complex acid clear liquid, its sulfuric acid massfraction is 63.74%, and iron level massfraction is 0.15%, and this acid is for titanium dioxide acidolysis or phosphorous chemical industry extraction Deng Yongsuan workshop section.Thick slurry is back to Yi Ci complex acid workshop section and continues complex acid.The rate of recovery of complex acid process sulfuric acid reaches 97.36%.
embodiment 3
By the spent acid in production process of titanium pigment, its main component, counts: H in mass ratio
2sO
420.51%, FeSO
49.13%, Al
2(SO
4)
30.66% MgSO
42.16%, TiO
20.36%, through countercurrent spray rotary kiln calcining tail gas, utilize the waste heat concentrate of calcining tail gas to H
2sO
432%, then reclaim after metatitanic acid by flocculating settling, limpid spent acid obtained; Spent acid is joined in a complex acid groove, more slowly to add sulfuric acid massfraction be 98% the vitriol oil, the spent acid of every 5t 28% adds the 1.33t vitriol oil, and the two mixes, and obtains nitration mixture.Then carry out Slow cooling cooling, slaking, the speed of cooling is 8 ℃/h, and 60 ℃ of terminal temperatures are cooled to terminal temperature post curing 3h, and whole nitration mixture are squeezed into pressure filter and carried out solid-liquid separation, and separation obtains complex acid filtrate one time.Its sulfuric acid massfraction is that 48.14%, complex acid filtrate iron level massfraction is 1.04%, and the condensed slag Free Sulfuric Acid massfraction obtaining is 8.43%, and condensed slag is mixed and fired standby sulfuric acid or bodied ferric sulfate production for sand acid.It is 98% the vitriol oil that complex acid filtrate adds sulfuric acid massfraction more fast, a complex acid filtrate of every 5t 48.14% adds the 2.17t vitriol oil, cooling and slaking condition are with a complex acid, slaking finishes, and adding system content is the flocculation agent of 10ppm, after settlement separate 30min, obtain secondary complex acid clear liquid, its sulfuric acid massfraction is 65.00%, and iron level massfraction is 0.14%, and this acid is for titanium dioxide acidolysis or phosphorous chemical industry extraction Deng Yongsuan workshop section.Thick slurry is back to Yi Ci complex acid workshop section and continues complex acid.The rate of recovery of complex acid process sulfuric acid reaches 97.30%.
comparative example 1
By the spent acid in production process of titanium pigment, its main component, counts: H in mass ratio
2sO
420.51%, FeSO
49.13%, Al
2(SO
4)
30.66% MgSO
42.16%, TiO
20.36%, through countercurrent spray rotary kiln calcining tail gas, utilize the waste heat concentrate of calcining tail gas to H
2sO
428%, then reclaim after metatitanic acid by flocculating settling, limpid spent acid obtained; Spent acid is joined in a complex acid groove, and slowly adding sulfuric acid massfraction is 98% the vitriol oil, and the spent acid of every 5t 28% adds the 3.59t vitriol oil, and the two mixes, and obtains nitration mixture.Then carry out Slow cooling cooling, slaking, the amplitude of gradient cooling is 8 ℃/h, 60 ℃ of terminal temperatures, be cooled to terminal temperature post curing 1h, whole nitration mixture are squeezed into pressure filter and are carried out solid-liquid separation, separation obtains acid filtering, and this acid filtering sulfuric acid massfraction is 63.74%, and iron level massfraction is 0.15%.The condensed slag Free Sulfuric Acid massfraction obtaining is 31.68%.The rate of recovery of complex acid process sulfuric acid reaches 88.79%.
comparative example 2
With reference to CN101774557A, carry out, by the spent acid in production process of titanium pigment, its main component, counts: H in mass ratio
2sO
420.51%, FeSO
49.13%, Al
2(SO
4)
30.66% MgSO
42.16%, TiO
20.36%, through countercurrent spray rotary kiln calcining tail gas, utilize the waste heat concentrate of calcining tail gas to H
2sO
428%, then reclaim after metatitanic acid by flocculating settling, limpid spent acid obtained; Spent acid is joined in a complex acid groove, and slowly adding sulfuric acid massfraction is 98% the vitriol oil, and the spent acid of 5t 28% adds the 3.84t vitriol oil, and the two mixes, and obtains nitration mixture.Then carry out Slow cooling cooling, slaking, the amplitude of gradient cooling is 8 ℃/h, 60 ℃ of terminal temperatures, be cooled to terminal temperature post curing 1h, whole nitration mixture are squeezed into pressure filter and are carried out solid-liquid separation, separation obtains acid filtering, and this acid filtering sulfuric acid massfraction is 66.35%, and iron level massfraction is 0.13%.The condensed slag Free Sulfuric Acid massfraction obtaining is 33.67%.The rate of recovery of complex acid process sulfuric acid reaches 86.00%.Complex acid is adopted above 6.69 tons, gained 66.35% sulfuric acid for the second time, then to add sulfuric acid massfraction be 14.48 tons of 98% the vitriol oils, obtains sulfuric acid massfraction and be 21.17 tons, 88% sulfuric acid.Before in 5 tons of sulfuric acid concentrations of same quality spent acid that is 28%, add 6.13 tons, 88% sulfuric acid, by above-mentioned slaking operation, obtaining acid filtering sulfuric acid massfraction is 67.39%, iron level massfraction is 0.12%, the condensed slag Free Sulfuric Acid massfraction obtaining is 35.16%, and the rate of recovery of complex acid process sulfuric acid reaches 88.29%.
Claims (4)
1. a recoverying and utilizing method for titanium white waste acid, is characterized in that, comprises the following steps:
A, spent acid pre-concentration and titanium reclaim: utilize rotary kiln using waste heat from tail gas pre-concentration to 25%-32% titanium white waste acid, then reclaim titanium operation, obtain titanium white waste acid clear liquid;
B, a complex acid: the titanium white waste acid clear liquid that steps A is obtained, add vitriol oil complex acid to mix, the mass percent of controlling sulfuric acid in nitration mixture is 45%-50%, then cooling, crystallization, slaking, solid-liquid separation, obtains complex acid filtrate and condensed slag;
C, secondary complex acid: the complex acid filtrate that step B is obtained, add vitriol oil complex acid to mix, the mass percent of controlling sulfuric acid in nitration mixture is 60%-65%, then cooling, crystallization, slaking, settlement separate, obtain gelled acid clear liquid and thick oar, thick slurry is back to Yi Ci complex acid workshop section.
2. the recoverying and utilizing method of a kind of titanium white waste acid according to claim 1, is characterized in that, adds system content 5-10ppm flocculation agent auxiliary settlement separate in step C.
3. according to the recoverying and utilizing method of a kind of titanium white waste acid described in claim 1 or 2, it is characterized in that, the rate of cooling in step B, C is 5-10 ℃/h, and the curing time is 1-3h.
4. according to the recoverying and utilizing method of a kind of titanium white waste acid described in claim 1 or 2, it is characterized in that, the cooling final temperature in step B, C is 60-65 ℃.
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| CN106315521A (en) * | 2016-08-18 | 2017-01-11 | 四川龙蟒钛业股份有限公司 | Recycling method of titanium dioxide waste acid |
| CN107986244A (en) * | 2017-12-11 | 2018-05-04 | 珠海绿水环保科技有限公司 | A kind of recovery method of the Waste Sulfuric Acid of metal ion |
| CN108529666A (en) * | 2018-02-28 | 2018-09-14 | 安徽迪诺环保新材料科技有限公司 | Method, product and the application of lithium titanate are prepared by inorganic ti sources |
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| CN110697792A (en) * | 2019-10-31 | 2020-01-17 | 襄阳龙蟒钛业有限公司 | Method for preparing yellow ferrous iron with controllable particle size by using waste acid from titanium dioxide production |
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| CN115974123A (en) * | 2022-12-09 | 2023-04-18 | 四川大学 | Method for recycling sulfuric acid and valuable metals in titanium white waste acid |
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| CN106315521A (en) * | 2016-08-18 | 2017-01-11 | 四川龙蟒钛业股份有限公司 | Recycling method of titanium dioxide waste acid |
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| CN108529666A (en) * | 2018-02-28 | 2018-09-14 | 安徽迪诺环保新材料科技有限公司 | Method, product and the application of lithium titanate are prepared by inorganic ti sources |
| CN109941970A (en) * | 2019-04-24 | 2019-06-28 | 成都先进金属材料产业技术研究院有限公司 | Utilize the method for aluminum aluminum sulfate concentration titanium white waste acid |
| CN110697792A (en) * | 2019-10-31 | 2020-01-17 | 襄阳龙蟒钛业有限公司 | Method for preparing yellow ferrous iron with controllable particle size by using waste acid from titanium dioxide production |
| CN113387334A (en) * | 2021-06-16 | 2021-09-14 | 龙佰四川钛业有限公司 | Concentration and purification method of titanium dioxide waste acid by sulfuric acid process |
| CN113387334B (en) * | 2021-06-16 | 2022-10-28 | 龙佰四川钛业有限公司 | Concentration and purification method of titanium dioxide waste acid by sulfuric acid process |
| CN113772633A (en) * | 2021-09-09 | 2021-12-10 | 东华工程科技股份有限公司 | Mixed acid system and method for removing ferrous sulfate in titanium white waste acid |
| CN115974123A (en) * | 2022-12-09 | 2023-04-18 | 四川大学 | Method for recycling sulfuric acid and valuable metals in titanium white waste acid |
| CN115974123B (en) * | 2022-12-09 | 2024-04-12 | 四川大学 | Method for recycling sulfuric acid and valuable metals in titanium white waste acid |
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Address after: 618200 Deyang city of Sichuan province Mianzhu new industrial zone longmang Chemical Industrial Zone Patentee after: Longbai Sichuan Titanium Co., Ltd Address before: 618200 Deyang city of Sichuan province Mianzhu new industrial zone longmang Chemical Industrial Zone Patentee before: SICHUAN LOMON TITANIUM Co.,Ltd. |