694results about "Titanium dioxide" patented technology

The invention provides a method for recovering Si, C and TiO2 based on chlorinated waste salt water quenching slag, which comprises the following steps: sequentially carrying out water quenching dissolution, precipitation separation and filter pressing dehydration treatment on chlorinated waste salt to obtain water quenching slag and supernate; adding a dilute acid solution into the water-quenched slag, dissolving, and adding a reducing agent for reaction to obtain slurry; carrying out solid-liquid separation on the slurry to obtain a solid material and filtrate; the filtrate is pumped into a boiling bed separator, the petroleum coke and TiO2 are intercepted by a medium material layer, clear liquid is discharged, then the medium material layer is subjected to backwashing regeneration, and the desorbed petroleum coke and TiO2 are subjected to graded enrichment by a hydrocyclone, so that petroleum coke slurry and TiO2 slurry are obtained. According to the method, TiO2, C and other resources in the water-quenched slag obtained after molten salt chlorination waste salt water quenching are recycled, and the technical problem that in the existing chlorination waste salt resourceful treatment process, Si, C, TiO2 and other resources in the water-quenched slag are wasted is solved.

The invention provides a ternary precursor sequentially coated with titanium and aluminum and a preparation method and application thereof. The ternary precursor comprises a ternary precursor core, and the exterior of the ternary precursor core is sequentially coated with a titanium oxide middle layer and an Al (OH) 3 outer layer. The preparation method comprises the following steps: coating a ternary precursor core with a titanium oxide intermediate layer and an Al (OH) 3 outer layer to obtain a ternary precursor, calcining when the ternary positive electrode material is prepared, dehydrating the Al (OH) 3 outer layer to form an Al2O3 outer layer, inhibiting the volume expansion and shrinkage of the core in the ternary positive electrode material by the titanium oxide intermediate layer and the Al2O3 outer layer, and isolating the ternary positive electrode material from an electrolyte, so that the ternary positive electrode material is prepared. The surface side reaction of the ternary positive electrode material is inhibited; besides, through sequential coating of the titanium oxide intermediate layer and the Al2O3 outer layer, a continuous and defect-free compact layer formed during single coating of the titanium oxide intermediate layer and the Al2O3 outer layer can be avoided, so that lithium ion diffusion is facilitated.

This invention relates to a method for preparing monodisperse doped titanium dioxide with in-situ lattice strain, belonging to the field of nanomaterial dispersion preparation. The titanium dioxide prepared by this method possesses abundant oxygen vacancies and surface active sites. The method employs a secondary titanium source injection followed by a rapid solvothermal reaction with increasing temperature. Lattice strain is controlled by the difference in lattice contraction rates at the amorphous-crystalline interface, reducing the oxygen vacancy formation energy. Doping with low-valence metal ions further stabilizes the oxygen vacancy structure. Surface modifiers can regulate the particle surface properties to adapt to various solvent systems, facilitating the preparation of highly transparent composite functional materials.

The invention discloses a preparation method of high-purity titanium dioxide, which is characterized by comprising the following steps: (1) preparing a titanium solution: slowly adding a titanium tetrachloride solution into deionized water to obtain the titanium solution; (2) heat-preservation hydrolysis: adding an acidic dispersant into the titanium liquid obtained in the step (1), stirring and mixing uniformly at room temperature, heating to 80-85 DEG C, preserving heat, and carrying out hydrolysis reaction for 1-2 hours to obtain hydrolysis slurry; (3) obtaining a precursor: cooling, aging, filtering, washing and drying the hydrolyzed slurry obtained in the step (2) to obtain a metatitanic acid precursor; and (4) calcining: calcining the metatitanic acid precursor obtained in the step (3) at 400 DEG C to obtain the high-purity titanium dioxide. According to the preparation method of the high-purity titanium dioxide, provided by the invention, the high-purity (greater than or equal to 99.9%) titanium dioxide is prepared under mild process conditions of low-temperature hydrolysis and low-temperature calcination, the product yield reaches about 90%, and the obtained high-purity titanium dioxide is spherical titanium dioxide with a rutile structure and has good dispersity.

The invention relates to the technical field of nano titanium oxide preparation processes, and discloses a nano titanium oxide preparation method which comprises the following steps: dissolving cerium nitrate in deionized water to obtain a solution A; dissolving tetrabutyl titanate in absolute ethyl alcohol, adding the solution A, and uniformly stirring to obtain a solution B; dissolving glycerol and hydroxybenzophenone in deionized water, and uniformly stirring to obtain a solution C; slowly dropwise adding the solution B into the solution C, adding citric acid at the same time, and violently stirring to form a mixed solution; adjusting the pH value of the mixed solution to 9.0-10.0 to form a suspension; and carrying out reaction on the suspension at 160-200 DEG C for 6-10 hours. According to the nano titanium oxide prepared by the preparation method disclosed by the invention, the skin feeling of the nano titanium oxide can be remarkably improved, the problems of dryness, thickness, whitening and the like are reduced, and the use satisfaction of consumers is improved.

The invention relates to a method for preparing nanoscale titanium dioxide by a gas-liquid method, which comprises the following steps: (1) introducing a carrier gas carrying titanium tetrachloride gas into an aqueous solution containing a dispersing agent, and hydrolyzing by the gas-liquid method to obtain metatitanic acid slurry; (2) carrying out solid-liquid separation, washing and drying on the metatitanic acid slurry obtained in the step (1) to obtain metatitanic acid; and (3) mixing the metatitanic acid obtained in the step (2) with a pyrolysis aid, and carrying out pyrolysis to obtain the nanoscale titanium dioxide. Nanoscale, high-dispersion and crystal-form-controllable preparation of titanium dioxide is realized by changing the introduction mode of titanium tetrachloride and matching with the dispersing agent and the pyrolysis aid. The titanium tetrachloride is introduced in a gas manner, so that the reaction temperature and speed can be adjusted, and the method has the advantages of improving the reaction efficiency, reducing the reaction temperature, being simple in preparation method, mild in reaction condition and the like.

The invention relates to the technical field of batteries, in particular to a low-hydrogen-evolution graphene material for a lead-acid battery and a preparation method thereof.The method comprises the steps that firstly, ethidene diamine is grafted to the surface of graphene oxide through a carbodiimide / active ester method, and aminated graphene is obtained; performing heat treatment in a nitrogen / ammonia gas atmosphere to realize nitrogen doping; compounding with titanium dioxide, and carrying out hydrothermal reaction to form a stable structure; then, sequentially grafting imidazolium silane and perfluorodecyl silane to carry out hydrophobic modification; and finally, stabilization and low-temperature re-nitridation curing are carried out through titanium tetrabutoxide. The graphene material prepared by the method endows the battery with excellent performance, and is low in direct-current internal resistance and high in capacity retention ratio.

The invention discloses a multi-element co-coated lithium ion ternary positive electrode material and a preparation method thereof, the multi-element co-coated lithium ion ternary positive electrode material comprises an inner core and a shell, the inner core is a high-nickel ternary positive electrode material NCM, the nickel content is greater than or equal to 80%, and the median particle size D50 of the powder is 6-12 [mu] m; the shell is a composite coating layer and coats the surface of the inner core, the composite coating layer comprises LATP, TiO2 and AlPO4, the total mass of the composite coating layer accounts for 0.5%-3% of the mass of the inner core, and the mass ratio of the LATP to the TiO2 to the AlPO4 is (80%-90%): (12%-6%): (8%-4%). The surface of the ternary material is simultaneously coated with a layer of LATP, TiO2 and AlPO4 spontaneously at one time through a hydrothermal method, so that the contact between the ternary material and an electrolyte is reduced, the surface lithium ion mobility is improved, the polarization is reduced, and the cycling stability and safety of the material are further improved.

The invention relates to the technical field of electrochemical analysis and detection, in particular to a sensitive detection tert-butylhydroquinone modified glassy carbon electrode, a preparation method and application, the sensitive detection tert-butylhydroquinone modified glassy carbon electrode has high specific surface area and catalytic activity and good conductivity, sensitive detection of tert-butylhydroquinone can be achieved, and the application range is wide. The modified glassy carbon electrode comprises a glassy carbon electrode and a compound coating, the compound coating wraps the surface of the glassy carbon electrode, and the compound coating is composed of graphene oxide and a Ti-based MOF derivative; the preparation method comprises the following steps: (1) preparing MIL-125 (Ti); (2) preparation of TiO2 / NC; (3) preparation of 15% GO (at) TiO2 / NC; (4) preparing a dispersion liquid of the prepared 15% GO-coated TiO2 / NC composite material; (5) manufacturing a modified electrode; the application comprises the following steps: S1, establishing a concentration-electrochemical response signal relationship; and S2, measuring the concentration of the to-be-measured substance.

The invention discloses a sodium-ion battery positive electrode material preparation system, and relates to the technical field of sodium-ion battery production, and the sodium-ion battery positive electrode material preparation system comprises a raw material intelligent management and control module, an equipment linkage control module, a sintering process precise regulation and control module, a quality online monitoring module and a data management and analysis module; through high-precision automatic weighing and closed conveying of the raw material intelligent management and control module, the raw material matching precision is improved, material loss is reduced, by means of a collaborative logic algorithm of the equipment linkage control module, the material circulation efficiency is improved, the production period is shortened, and by means of dynamic regulation and control of the sintering process precise regulation and control module, the production efficiency is improved. The sintering qualified rate is improved, the product batch quality difference is reduced, unqualified products are reduced by using real-time detection and feedback of the quality on-line monitoring module so as to reduce the production cost, process optimization, quality tracing and energy consumption monitoring are realized through the data management and analysis module, the comprehensive energy consumption is reduced, and the production efficiency is improved. And large-scale, high-quality and low-cost production of the sodium-ion battery positive electrode material is realized.

The invention discloses a preparation method and application of an S-type heterostructure material with a plasma resonance effect, and the preparation method comprises the following steps: grinding a precursor material, calcining, collecting solid powder, carrying out reflux purification in deionized water, and collecting white powder; dispersing the white powder in a hydrazine hydrate solution, carrying out solvothermal reaction to obtain a faint yellow solution, repeatedly dissolving and precipitating by respectively using acidic and alkaline reagents, washing and drying to obtain a faint yellow solid product; uniformly grinding the faint yellow solid product, calcining the faint yellow solid product in an atmosphere furnace, and cooling to obtain orange solid powder; and adding the orange solid powder into an organic solvent of a precursor containing a tungsten source, and centrifuging, washing and drying after the solvothermal reaction is finished to obtain the S-type heterostructure material with the plasma resonance effect. The S-type heterostructure material with the plasma resonance effect has relatively high efficiency for simulating separation and removal of uranium species in post-treatment wastewater and shows relatively good anti-radiation stability.

This invention belongs to the field of microwave absorbing material preparation technology, and discloses a two-step partial oxidation method to improve the microwave absorption performance of MXene materials. By performing hydrothermal pre-oxidation and heat treatment on MXene materials, oxide nanoparticles are grown in situ on their surface, achieving controllable partial oxidation. The MXene matrix retains a two-dimensional layered structure, and a heterogeneous interface is formed between the oxide nanoparticles and the MXene matrix. This adjusts the conductivity, optimizes impedance matching, enhances interface polarization, improves microwave absorption performance, and provides high-temperature stability.

This invention relates to a modified titanium dioxide for matting polyester fibers and its preparation method. The modified titanium dioxide comprises a mesoporous titanium dioxide core and a cysteine ​​graft layer grafted into the pores of the mesoporous titanium dioxide. The mesoporous titanium dioxide core is prepared by evaporation-induced self-assembly using an alkenyl sulfonate surfactant as a liquid crystal template and tetraethyl or tetrabutyl titanate as the titanium source. Due to the self-polymerization reaction of the alkenyl sulfonate, the resulting polyalkenyl sulfonic acid compound reduces the crystallinity of the mesoporous titanium dioxide, thereby significantly reducing its photocatalytic activity. The mesoporous titanium dioxide is mixed with cysteine ​​and heated to graft cysteine ​​into its pores. The presence of cysteine ​​results in the modified titanium dioxide exhibiting both good matting properties and suppressed photocatalytic activity, preventing fiber structure damage from prolonged ultraviolet irradiation when applied to polyester fibers.

The invention relates to a method for separating iron, vanadium and titanium dioxide in vanadium titano-magnetite or titanium concentrate through a wet method, and belongs to the technical field of chemical engineering. The method comprises the following steps: (a) mixing vanadium titano-magnetite or titanium concentrate with sulfuric acid with the concentration of 22-30wt.% to obtain mixed slurry; (b) treating the mixed slurry at 150-200 DEG C and 2-4 MPa under the condition that the Reynolds number is gt; reacting in a turbulent flow state of 4000, so that non-titanium elements are dissolved to generate sulfate; (c) carrying out solid-liquid separation on the reaction product in the step (b) to obtain a high-grade titanium-rich material and waste liquid; (d) the titanium-rich material reacts with a sodium hydroxide solution, silicon in the titanium-rich material is removed, and a sodium silicate solution is generated; and (e) reacting the silicon-removed titanium-rich material with a hydrochloric acid solution with the mass concentration of less than 15%, cleaning, carrying out solid-liquid separation, and calcining to obtain anatase or rutile titanium dioxide. According to the method, all iron, vanadium and titanium elements in the vanadium-titanium-iron concentrate and the titanium concentrate are recycled.

A method of remediating a contaminated aqueous medium includes contacting the aqueous medium with an amount of a particulate nanocomposite material that contains elemental carbon (C); an orthorhombic titanium dioxide (TiO2); a tetragonal TiO2 crystalline phase; a cubic cadmium oxide (CdO) crystalline phase; a hexagonal magnesium titanate (MgTiO3) crystalline phase; and, an orthorhombic magnesium titanate oxide (Mg0.6Ti2.4O5). Based on the total number of atoms in the nanocomposite material and as determined by energy dispersive X-ray spectroscopy, the nanocomposite material has an atomic concentration of carbon (C) of from about 1 atomic percent (at. %) to about 5 at. %; an atomic concentration of magnesium (Mg) of from about 5 to about 15 at. %; an atomic concentration of titanium (Ti) of from about 15 to about 30 at. %; and, an atomic concentration of cadmium (Cd) of from about 1 to about 10 at. %.

A method of making surface-functionalized transition metal oxide nanoparticles comprises: providing a sol comprising transition metal oxide nanoparticles dispersed in an aqueous liquid medium having a pH of less than or equal to 3.5, combining the sol with an extractant composition comprising at least one carboxylic acid and at least one organic amine, and a water-immiscible organic solvent, and separating at least a portion of the organic phase from the aqueous phase and then at least partially removing the water-immiscible organic solvent. The carboxylic acid has from 6 to 30 atoms. The organic amine is represented by the formula R2R3NH, wherein R2 is a hydrocarbyl group having from 6 to 30 carbon atoms, and R3 is H or an alkyl group having from 1 to 4 carbon atoms. The at least one organic amine is present in an amount sufficient raise the pH to at least 5, thereby forming discrete separable aqueous and organic phases. A surface-modified nanoparticle composition, a curable composition and an article comprising the same are also disclosed.

The application belongs to the technical field of sensitive materials, and discloses a high-performance TiO2@In2O3 / Pd sensitive film for a MEMS gas sensor, a synthesis method thereof and a MEMS gas sensor. The method comprises the following steps: synthesizing mesoporous TiO2 nanoparticle balls; mixing indium salt, an alkaline compound, a surfactant and the mesoporous TiO2 nanoparticle balls uniformly, and then performing hydrothermal reaction; centrifuging, washing and drying the product of the hydrothermal reaction, and then performing first annealing treatment in an air atmosphere to obtain In2O3-coated titanium dioxide nanoparticle balls TiO2@In2O3; modifying palladium nanoparticles to the nanoparticle balls TiO2@In2O3 by a solution method, centrifuging, washing and drying, and then performing second annealing treatment in a hydrogen atmosphere to obtain In2O3-coated titanium dioxide nanoparticle balls TiO2@In2O3 / Pd with Pd modification; and manufacturing the nanoparticle balls TiO2@In2O3 / Pd into a sensitive film. The sensitive film manufactured by the above method can improve the sensitivity of gas detection.

Titanium dioxide (TiO2) forms the basis of devices for applications including sensing devices, solar cells, photo-electrochromics, and photocatalysis. Such devices exploit different phases of TiO2 within such devices and accordingly it would be beneficial to have an amorphous TiO2 precursor which allows crystalline phase spatial patterning, for the crystallization of the amorphous TiO2 precursor to be triggered at low energies, and with the crystalline phase controllable at room-temperature without necessitating complex handling whilst providing TiO2 phases that are stable over a prolonged period of time. Accordingly, there are provided processes for providing a TiO2 precursor and controlling the conversion of the TiO2 precursor from amorphous-to-anatase, amorphous-to-rutile, amorphous-to-mixture of anatase / rutile or from amorphous-to-anatase-to-rutile in a simple and efficient manner.

The invention relates to the field of nano materials and photonic crystal materials, in particular to nano particles, preparation of the nano particles and application of the nano particles in self-assembly of three-dimensional non-close-packed photonic crystals. The nanoparticles can be self-assembled into a three-dimensional non-close-packed photonic crystal in a concentration range of 1 wt%-60 wt%. According to the invention, the problem that the self-assembly of the three-dimensional non-close-packed colloid photonic crystal is difficult to realize at low concentration at present is solved. By adjusting the mass fraction of the particles in a solution, the three-dimensional non-close-packed colloidal photonic crystal with rich colors can be formed through self-assembly, and the three-dimensional non-close-packed colloidal photonic crystal has wide application prospects in the fields of sensing, display and the like.

The present application relates to the field of electrochemistry, and more particularly to a gradient micro-crack composite coating titanium-based metal oxide electrode and a preparation method thereof. The electrode comprises a titanium substrate and a gradient micro-crack composite coating, which comprises, in sequence, a dense low-crack bottom layer prepared by a thermal decomposition method and a high-crack density surface layer prepared by a sol-gel method. Experimental results show that the gradient micro-crack composite coating can effectively prevent the penetration of electrolyte into the titanium substrate through the dense structure of the bottom layer, avoid the passivation of the substrate, and prolong the service life; the high-crack structure of the surface layer significantly increases the electrochemical active surface area, ensuring high electrocatalytic activity. The electrode realizes the synergistic consideration of activity and life, and has simple preparation process and low cost, without the need to introduce additional intermediate layers or complex equipment, and is suitable for electrochemical engineering fields such as chlor-alkali industry, electrolytic seawater chlorination, cathodic protection and wastewater treatment.

The present invention discloses a layered titanium dioxide-based electrode material and its preparation method and application, belonging to the technical field of titanium-based negative electrode materials for sodium ion batteries. The above-mentioned preparation method is as follows: layered alkali metal titanate K 0.8 Li 0.27 Ti 1.73 O4 was acidified and filtered and dried to obtain layered titanate H 1.07 Ti 1.73 O4 powder, followed by layered titanate H 1.07 Ti 1.73 O4 powder is mixed with an expander and expanded to produce expanded layered titanic acid. A carbon precursor solution is then added and stirred, and then allowed to stand to produce a colloidal precursor. The colloidal precursor is hydrothermally treated to produce an intermediate electrode material. The intermediate electrode material is then washed with water and carbonized at high temperature to produce a layered titanium dioxide-based electrode material. The resulting material features alternating titanium dioxide and carbon layers, ensuring full contact between the carbon material and the TiO2, maximizing electrical conductivity.

The invention provides a sodium ion battery and a preparation method of the sodium ion battery, and relates to the technical field of batteries. The preparation method of the negative electrode material of the sodium ion battery comprises the following steps: treating titanium-containing blast furnace slag to obtain metatitanic acid; metatitanic acid is treated, titanate is obtained, and the titanate has the nanoflower morphology; titanate is treated to obtain titanium dioxide, and the titanium dioxide has a nanoflower morphology and has oxygen vacancies. According to the negative electrode material prepared by the preparation method of the scheme, the migration rate of sodium ions can be improved, the specific capacity and the cycling stability of the negative electrode material are improved, and the negative electrode material has relatively good rate capability; and the negative electrode material is prepared by taking the titanium-containing blast furnace slag as a raw material, so that the cost of the raw material can be greatly reduced, and the environmental problem caused by solid waste accumulation can be solved.

The present invention relates to the field of materials chemistry, and specifically to a method for enhancing the surface photovoltage of TiO2. The method comprises the following steps: taking a certain amount of fluorinated polyimide powder and mixing it with ethanol, then adding tetrabutyl titanate to form a suspension, adding deionized water dropwise, stirring, and transferring to a hydrothermal reactor for hydrothermal reaction. After the hydrothermal reaction is completed, the powder is filtered, washed, dried, and ground, and an appropriate amount of powder is placed in a quartz boat of a tubular furnace and heated in an ammonia atmosphere. After cooling, the powder is taken out and ground to obtain TiO2 with enhanced surface photovoltage. The present application can effectively improve the surface photovoltage signal of TiO2 by adding fluorinated polyimide during preparation and treating it in an ammonia atmosphere. This research has practical significance for promoting the practical application of TiO2 photocatalytic materials. In addition, the present invention is simple to operate and easy to implement.

A method for preparing titanium dioxide that includes the steps of providing at least one titanium precursor: providing one or more potassium precursors: mixing the at least one titanium precursor with the one or more potassium precursors to form a mixture: wherein the mixture has a potassium to titanium (K / Ti) molar ratio of 2.0 / 4.0<K / Ti<2.0 / 2.4; sintering the mixture at a temperature in the range of 750° C. to 900° C. for a predetermined time to form a powder: soaking the heated powder in an acidic solution: collecting and drying the acid-soaked powder: and treating the collected powder thermally at a temperature in the range of 300° C. to 500° C. for a predetermined time to form the TiO2. The titanium oxide formed has a monoclinic crystal structure. TiO2(B), as its major crystal phase with a mass percentage that is >50% of the overall mas of the TiO2.

The application provides a foamed alkali-activated cementitious material, which is composed of an intermediate layer and surface layers covering the upper and lower surfaces of the intermediate layer, and the intermediate layer and the surface layers comprise the following raw materials: 30-50 parts by mass of blast furnace slag, 12-18 parts by mass of low-calcium fly ash, 9-15 parts by mass of alkaline magnesium slag, 10-15 parts by mass of alkali activator, 6-8 parts by mass of foaming agent and 3-5 parts by mass of foam stabilizer; the surface layer further comprises 1.5-5 parts by mass of functional catalyst, and the functional catalyst is gel-like micro-nano TiO2 particles. The application utilizes fly ash, magnesium slag and slag and other types of solid waste to prepare building materials with the ability to degrade formaldehyde. Compared with traditional porous foamed materials, the foamed alkali-activated cementitious material prepared by using aluminum powder as a foaming agent has the advantage of utilizing industrial by-products, and the excess aluminum powder not only produces a dense and uniform pore structure, but also is conducive to the adsorption of formaldehyde gas and the improvement of mechanical strength.

The invention discloses a titanium dioxide nanorod / dissimilar metal MOFs heterojunction material and a preparation method and application thereof, and belongs to the technical field of photoelectrochemistry seawater hydrogen production. Soluble nickel salt, soluble cadmium salt or soluble cobalt salt and ammonium molybdate are adopted as metal sources, spherical dissimilar metal MOFs grow on the surface of a TiO2 nanorod in situ, and the TiO2 nanorod / dissimilar metal MOFs heterojunction material is prepared. According to the present invention, the oxygen deficiency-regulated dissimilar metal MOFs material (i.e., the titanium dioxide nanorod / dissimilar metal MOFs heterojunction material) is obtained through subsequent acid etching and annealing treatment, the material is subjected to in-situ reconstruction during the OER process to spontaneously form the active hydroxide (NiOOH) of anion protection (MoO4 < 2->), and the excellent stability is represented; only small Faraday efficiency loss (1.2-2.3%) occurs in a high chloride ion environment (3.5 wt%-7wt% of NaCl), and an extensible path is provided for industrial-scale solar hydrogen production by using seawater.

The invention belongs to the technical field of secondary battery positive electrode materials. The invention relates to a lithium manganese phosphate material, in particular to a doped lithium manganese phosphate material and a preparation method thereof. The product comprises a lithium manganese iron phosphate inner core and a lithium iron phosphate shell coating the surface of the lithium manganese iron phosphate inner core, wherein the lithium manganese iron phosphate inner core comprises pores and titanium dioxide deposited in the pores, the content of the titanium dioxide is 1.5-2.5% of the mass of the lithium manganese iron phosphate inner core, and the porosity of the lithium manganese iron phosphate is 20-25%; wherein the porosity is equal to (1-apparent density / true density) * 100%; the true density is 3.6 g.cm <-3 >; the apparent density is measured by a tap density instrument. The D50 of the lithium manganese iron phosphate core is 5-6 [mu] m; the particle size distribution Span value of the lithium manganese iron phosphate inner core is 0.8 to 1.0; the Span value is equal to (D90-D10) / D50.

The application provides a method for treating and recycling iron-containing waste sulfuric acid in titanium dioxide production, which is based on screening of a strain capable of treating iron-containing waste water in a low pH environment, and establishes a method for treating iron-containing waste sulfuric acid, which can effectively realize resource recycling. The waste water treatment bacteria used are Bacillus QD-QJ-062 strain, and the preservation number is CGMCC No.33725. The QD-QJ-062 strain of Bacillus screened by the application can effectively treat the iron-containing waste water in a low pH environment, promote the generation of ferrous oxalate precipitation, and generate ferrous oxalate by-products. The generated ferrous oxalate can be converted into ferrous sulfate by sulfuric acid, and oxalic acid can be recycled, thereby reducing the operation cost. The sulfuric acid solution after iron removal can be neutralized by limestone to generate high-purity gypsum, thereby realizing resource recycling and treatment.

The utility model relates to a titanium dioxide zero-carbon suspension rapid crystal transformation system which comprises a desulfurizing tower, an induced draft fan, a bag collector, a scattering dryer, a high-temperature fan, a first cyclone cylinder, a suspension calcining furnace and a second cyclone cylinder. According to the utility model, titanium dioxide is produced by adopting a suspension calcination technology, green electricity is adopted as electric energy, and a byproduct carbon dioxide is recycled, so that zero-carbon production of products is facilitated, and carbon neutralization in the titanium dioxide industry is promoted.

The present invention relates to an exothermic process for producing metal oxides or metalloid oxides, comprising introducing metal and / or metalloid precursors into a flame formed by burning a gas mixture comprising oxygen and hydrogen, at least a portion of the hydrogen being obtained from the electrolysis of water or an aqueous solution using electrical energy obtained at least in part from a renewable energy source, and at least a portion of the thermal energy of the flame being transferred by at least one exchanger to a first heat transfer medium, thereby heating the first heat transfer medium to a maximum temperature in the range between 80°C and 150°C.