108 results about "Metatitanic acid" patented technology

The invention discloses a polydopamine modified metatitanic acid type lithium ion sieve and a preparation method thereof, and belongs to the technical field of lithium ion sieves, the preparation method comprises the following steps: grinding and uniformly mixing lithium acetate dihydrate and titanium dioxide in an organic solvent, and calcining the mixture at 650-800 DEG C for 3-5 hours to prepare a Li2TiO3 precursor; the preparation method comprises the following steps: putting dopamine hydrochloride, aminated crown ether and a Li2TiO3 precursor into a tris (hydroxymethyl) aminomethane solution with the pH value of 8-9, carrying out a constant-temperature oscillation reaction, carrying out suction filtration, and drying at low temperature, so as to obtain the polydopamine modified metatitanic acid type lithium ion sieve. According to the lithium ion sieve, the adsorption effect on lithium ions can be improved, the lithium extraction efficiency is improved, and the problem of low adsorption capacity of a lithium ion sieve in the prior art is solved.

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.

At least one embodiment of the invention provides a preparation method of sponge titanium, which comprises the following steps: pretreating bauxite tailings to obtain a first mixture; carrying out acid treatment on the first mixture, and filtering to obtain a second mixture; putting the second mixture into a reaction kettle containing an alkaline substance to react so as to convert the ferric titanate into titanate and ferric oxide or ferrous hydroxide to obtain a third mixture; carrying out suction filtration treatment on the third mixture to obtain a first solid phase and a first liquid phase, and drying and grinding the first solid phase; roasting the dried and ground first solid phase to form an iron elementary substance, and carrying out magnetic separation to remove the iron elementary substance; adding an acidic material into the first liquid phase for reaction to obtain metatitanic acid colloid, and washing the metatitanic acid colloid; the metatitanic acid colloid is subjected to calcination, chlorination reaction and replacement reaction in sequence to obtain the sponge titanium. The sponge titanium obtained through the preparation method is high in purity.

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 invention belongs to the technical field of nano barium titanate synthesis, and particularly relates to a method for synthesizing nano barium titanate by taking metatitanic acid recovered from a waste denitration catalyst as a raw material, which comprises the following steps: mixing the waste denitration catalyst with a concentrated alkali solution, and reacting in a colloid mill at normal temperature; transferring the reaction liquid into a high-pressure reaction kettle, filtering after the reaction is completed, and washing to be neutral to obtain alkaline leaching residues; fully mixing the dried alkaline leaching residues with a pickling solution, filtering, washing to be neutral, and drying to obtain nano metatitanic acid powder; the preparation method comprises the following steps: slowly adding a solution A obtained by fully stirring nano metatitanic acid powder and ethanol into a solution B obtained by fully mixing and dissolving a barium source and deionized water, continuously stirring, transferring the mixed solution into a high-pressure reaction kettle, and after the reaction is finished, washing, centrifuging and drying for multiple times to obtain the nano barium titanate powder. The H2TiO3 prepared by recycling the waste SCR catalyst is used as a raw material, the nano barium titanate powder with small particle size and high tetragonal phase is prepared through a hydrothermal method, and the method has the advantages of being low in cost, environmentally friendly and clean.

The present invention provides a preparation method of a structure-modified sodium ion battery positive electrode material, comprising the following steps: S1, mixing a sodium source, an iron source, a phosphorus source, a first carbon source, a structure modifier, and deionized water, adding the mixture to a high-gravity reactor rotating at 25,000 to 35,000 rpm, reacting at a temperature of 80 to 100° C. for 1 to 2 h, drying, and then calcining at 400 to 650° C. for 8 to 12 h in an inert gas atmosphere to obtain a precursor, wherein the structure modifier is at least one of sodium vanadate, sodium titanate, sodium manganate, sodium cobaltate, sodium chromate, metatitanic acid, magnesium oxide, copper oxide, zinc oxide, and yttrium oxide; S2, mixing the precursor, a second carbon source, and a chelate solution, adjusting the pH to 2.5 to 4.0, grinding the mixture at a temperature of 60 to 90° C. until the D50 is less than 0.95 μm, spray drying, and calcining at 400 to 650° C. for 8 to 12 h in an inert gas atmosphere. h obtain the structure-modified sodium ion battery positive electrode material.

The present application relates to the chemical industry, in particular to a kind of sulphuric acid method titanium white before kiln squeezing water recycling method and sulphuric acid method titanium white production process.The present application collects and recycles before kiln squeezing water in sulphuric acid method titanium white process, specifically recycling to bleaching and two washing procedures respectively, by the above-mentioned recycling, the collected before kiln squeezing water can be recycled completely, save bleaching pulp water while the percolation metatitanic acid is recycled to the flow, because the pulp after bleaching is washed by two washing, the soluble salt carried in before kiln squeezing water can be washed, so it will not affect subsequent salt treatment and calcination.In addition, by the recycling method of the present application, 1.5-2.0 t of water can be saved per ton of titanium dioxide, according to this calculation, 150-200 thousand tons of water can be saved in a 100,000-ton-per-year titanium dioxide production line, greatly saving the cost.

The present application relates to the technical field of pigment preparation, and particularly relates to metatitanic acid slurry, a preparation method thereof and rutile titanium dioxide and a preparation method thereof. The preparation method of the titanium dioxide comprises the following steps: mixing an imidazole ionic liquid and a first titanium oxychloride solution to perform heating treatment to form crystal seeds, then under the condition of reduced pressure distillation, a second titanium oxychloride solution is added, the evaporation amount is adjusted to maintain the volume of the system unchanged, the crystal seeds are allowed to grow, and then drying and calcination are performed; wherein the first titanium oxychloride solution and the second titanium oxychloride solution are both prepared by hydrochloric acid extraction method. The preparation method can prepare the rutile titanium dioxide with long strip shape and good pigment performance.

The present application belongs to the technical field of energy saving and consumption reduction of titanium dioxide production, and particularly relates to a method for energy saving and pollution reduction in the calcination process of sulfuric acid method titanium dioxide. The present application realizes the cascade utilization of high-temperature to medium-low-temperature waste heat through the integrated scheme of "preheating and quality improvement + oxygen-rich calcination + tail gas synergistic desulfurization and denitrification + resource utilization of by-products", that is, the calcination tail gas (1000-1100℃) is first used to generate steam for production through a waste heat boiler, and then is used for preheating and drying metatitanic acid after being cooled, thereby realizing the cascade utilization of high-temperature to medium-low-temperature waste heat, and simultaneously, the oxygen-rich combustion improves the fuel efficiency, the natural gas combustion is more sufficient, the energy consumption per unit product is reduced by 30-40%, and the ammonia method is used to simultaneously remove SO2 and NO x in a single reactor, the desulfurization efficiency is greater than or equal to 95%, the denitrification efficiency is greater than or equal to 85%, the concentration of dust in the tail gas after being removed by a bag filter is less than or equal to 10 mg / Nm3 for emission, the unity of environmental benefits and economic benefits is realized, and a new path is provided for the green upgrading of the sulfuric acid method titanium dioxide industry.

The application discloses a preparation method of high-purity titanium dioxide, which comprises the following steps: S1, titanium tetrachloride is slowly mixed with an aqueous hydrochloric acid solution to obtain a primary hydrolysis material containing titanium oxychloride and hydrochloric acid; S2, the primary hydrolysis material is mixed with water and subjected to secondary hydrolysis at 90-110 DEG C, and then solid-liquid separation is conducted after hydrolysis to obtain metatitanic acid precursor; and S3, the metatitanic acid precursor is calcined to obtain high-purity titanium dioxide. In the application, titanium tetrachloride is directly mixed with an aqueous hydrochloric acid solution under the conditions of a limited concentration and a limited amount at room temperature to generate a mixed solution of titanium oxychloride and hydrochloric acid, and then the mixed solution of titanium oxychloride and hydrochloric acid is subjected to secondary hydrolysis under the condition of a limited high temperature. Compared with direct hydrolysis of an aqueous titanium tetrachloride solution, the hydrolysis process does not need to be conducted under a low-temperature condition, there are less intermediate products, the reaction is easy to control, titanium oxychloride is fully hydrolyzed, and the hydrolysis rate is more than 99.0%.

The invention discloses a titanium white waste acid treatment process, and relates to the technical field of industrial waste regeneration. The titanium white waste acid is subjected to microfiltration and membrane electrolysis treatment, sulfuric acid is separated and recycled under the control of constant pressure and constant current, and residual liquid is subjected to electrodialysis treatment to oxidize ferrous ions into ferric hydroxide precipitates and calcined into ferric oxide; carrying out reduction leaching on the titanium-containing material, hydrolyzing to generate metatitanic acid, and calcining to obtain titanium dioxide; oxidizing the hydrolysate to precipitate vanadate, and calcining to obtain vanadium pentoxide; adjusting the pH value of the filtrate, selectively adsorbing scandium through a biological adsorption column, precipitating and calcining the eluent to obtain scandium oxide, and regenerating and recycling the adsorbent through acid pickling. According to the process, through multi-stage treatment and biological adsorption, resource recycling of sulfuric acid, iron, titanium, vanadium and scandium components in the waste acid is achieved, the process is clean and efficient, secondary pollution of a traditional process is avoided, and a green low-carbon solution is provided for waste acid treatment in the titanium dioxide industry.

The invention discloses a preparation method of hydrolyzed metatitanic acid with narrow particle size distribution and a high-whiteness rutile crude product, and belongs to the technical field of sulfuric acid process titanium dioxide production. By prolonging the first boiling time, canceling gray point observation, performing staged speed regulation stirring and optimizing the pressure maintaining and curing process, hydrolysis process parameters are optimized, and a staged calcination system adaptive to the characteristics of the hydrolysate is designed, so that the particle sizes of the hydrolysate are concentrated, the content of fine particles is low, and a titanium dioxide product with narrow particle size distribution, high whiteness, low yellowness and stable quality is finally obtained. The problems of wide particle size distribution, serious fine particle loss, large product quality fluctuation, over-burning / under-burning caused by mismatching of a hydrolysate and a calcination system and poor finished product performance in a traditional hydrolysis process are solved. The proportion of the hydrolysate with the particle size smaller than 1 micron is reduced by 0.5%, the hydrolysis rate is increased by 0.15%, the L value of the calcined finished product is larger than or equal to 95.5, the b value is smaller than or equal to 2.7, the daily output is increased to 15 batches, and remarkable economic and technical benefits are achieved.

The application discloses a method for preparing metatitanic acid with stable particle size from concentrated titanium liquid in titanium dioxide production, and particularly relates to the technical field of titanium dioxide production. First, the concentrated titanium liquid and alkali liquid are respectively preheated to 85-95 DEG C, the concentrated titanium liquid is added into the alkali liquid, the temperature is maintained at 95-120 DEG C for reaction, the reaction time is 5-10 min, and the crystal seed is obtained when the detection of crystal seed stability reaches below 100 ml water / 10 ml titanium liquid; then the crystal seed obtained in step one is added into the concentrated titanium liquid, and the stirring, pressurizing and heating are carried out for reaction, the reaction time is 15-60 min, and the reaction is kept for maturation after the reaction is completed; finally, the titanium liquid after the reaction in step two is cooled, and metatitanic acid with stable particle size is obtained after filtration.

The invention discloses a 1, 3, 5-isopropyl trimellitate composite material and an application of the 1, 3, 5-isopropyl trimellitate composite material, and the 1, 3, 5-isopropyl trimellitate composite material is in a composite material form of 1, 3, 5-isopropyl trimellitate (SYZ) and metatitanic acid (TiO2.H2O). The obtained composite material shows relatively high specific capacity and certain cycle and rate performance, and can be used as a lithium ion battery negative electrode material.

The application discloses a continuous hydrolysis system for sulfuric acid method titanium dioxide, which comprises a hydrolysis device, a temperature control pipeline, a metatitanic acid storage tank and a steam pipeline, wherein the hydrolysis device comprises a first preheating tank, a second preheating tank, a third preheating tank, a hydrolysis crystal seed preparation tank and a continuous mixing tank, the bottoms of the first preheating tank and the second preheating tank are communicated with the top of the hydrolysis crystal seed preparation tank respectively, and the bottoms of the third preheating tank and the hydrolysis crystal seed preparation tank are communicated with the top of the continuous mixing tank respectively; a pipeline heater and a pipeline cooler are sequentially connected between a first pipe opening and a second pipe opening of the temperature control pipeline, the first pipe opening is communicated with the continuous mixing tank, and the metatitanic acid storage tank is communicated with the second pipe opening. The application further provides a continuous hydrolysis method. The system and the method can convert the intermittent titanium liquid hydrolysis process into a continuous production, greatly improve the production efficiency, reduce the labor intensity of operation, and are favorable to promote the full-automatic production of the sulfuric acid method titanium dioxide.

The application discloses a conveying pipe for titanium dioxide production and relates to the technical field of pipes.The conveying pipe for titanium dioxide production comprises a pipe body, and a rotating switching mechanism for online switching and replacement of pipe function components is arranged on the side wall of the pipe body.The conveying pipe for titanium dioxide production can realize online maintenance and replacement of pipe function components without stopping and depressurizing and emptying, completely eliminates the stopping maintenance defects caused by the traditional fixed installation structure, guarantees the continuous, stable and efficient conveying of titanium dioxide wastewater, and simultaneously, the conical filter screen which can rotate with the fluid in the pipe is arranged at both ends of the mounting hole, the impact of large particle gypsum crystals and metatitanic acid particles can be effectively blocked, dynamic anti-blocking and anti-fouling protection is realized, the pipe function components are prevented from being wrapped, abraded or corroded, the service life of the heating / aeration type function components is remarkably prolonged, and the long-term stable operation of the pipe conveying system is ensured.

The application discloses a recycling method of titanium oxychloride solution by-produced in chlorination method of titanium dioxide, and comprises the following steps: S1, mixing and reacting the titanium oxychloride solution after removing iron with ZnO to generate ZnCl2; S2, beating the metatitanic acid filter cake after two washing and adding alkali to neutralize and remove sulfur; S3, beating the metatitanic acid filter cake after removing sulfur, adding the reaction solution prepared in the step S1 and other salt treatment agents to carry out salt treatment, and then carrying out solid-liquid separation to obtain a filter cake; and S4, calcining the filter cake. The application combines the titanium oxychloride solution with the preparation of the titanium dioxide by sulfuric acid method for the first time, utilizes the reaction of hydrochloric acid and ZnO to prepare the reaction solution containing ZnCl2, replaces the ZnCl2 salt treatment agent in the prior art, is used for the salt treatment of the titanium dioxide by sulfuric acid method, and simultaneously, the pH after the salt treatment makes the titanium oxychloride contained in the reaction solution hydrolyze into titanium dioxide, so that the purpose of recycling titanium in the titanium oxychloride can be achieved.

The application discloses a method for preparing titanium liquid by VTM ironmaking waste slag and hydrolysis pretreatment, and belongs to the technical field of resource utilization of VTM ironmaking waste slag. The method is targeted at the significant difference in the composition of titanium liquid prepared from waste slag (blast furnace slag and gas-based shaft furnace slag) from different sources, and the titanium liquid meeting the requirements of the hydrolysis process is obtained through targeted treatment. Through the combined process of "MVR concentration, crystallization, separation, purification and drying", the aluminum sulfate impurities in the titanium liquid are efficiently removed, and are converted into high-value aluminum sulfate hexadecahydrate products. The application effectively solves the problems of aluminum impurities in the titanium liquid interfering with hydrolysis, low TiO2 yield caused by improper concentration of trivalent titanium and poor quality of metatitanic acid, realizes accurate regulation and control of the composition of the titanium liquid and resource utilization of impurities, provides qualified raw materials for subsequent efficient hydrolysis for preparing high-quality titanium dioxide, and is stable in process, economical and environmentally friendly.

This invention discloses a method for preparing a strontium titanate modified layer on the surface of zirconia based on an impregnation-heat treatment method, comprising: (1) mixing titanium sulfate, urea and water to obtain a precursor liquid A, placing zirconia ceramic in the precursor liquid A, heating to boiling and maintaining for a period of time, then removing the zirconia ceramic, and after heat treatment A, preparing a titanium dioxide film on the surface of zirconia; (2) mixing H2O2 aqueous solution, ammonia and deionized water, adding metatitanic acid and stirring to dissolve, obtaining a precursor liquid B, placing the zirconia with the titanium dioxide film in the precursor liquid B, and allowing it to stand and react for a period of time at room temperature, depositing zirconia modified with a titanium dioxide precursor layer; (3) dissolving strontium acetate, or a mixed salt composed of calcium acetate and / or magnesium acetate and strontium acetate in deionized water to obtain an impregnation treatment solution, placing the zirconia modified with the titanium dioxide precursor layer in the impregnation treatment solution, allowing it to stand and react for a period of time, and then removing it, and after heat treatment B, preparing a strontium titanate modified layer on the surface of zirconia. The strontium titanate layer prepared on the surface of zirconia ceramic in this invention is tightly attached to the zirconia substrate and has high hydrophilicity, which is conducive to the adhesion of proteins and cells in the human body. At the same time, it can release active factors such as strontium ions for a long time to promote bone formation and bone regeneration at the implantation site, ultimately enhancing the osseointegration capacity of the zirconia implant.

The invention discloses a method for preparing titanium dioxide by a template method, and relates to the technical field of titanium dioxide pigments. The preparation method comprises the following steps: by taking a flaky base material as a carrier, hydrolyzing titanium oxychloride as a raw material under an acidic condition to generate metatitanic acid, uniformly depositing the metatitanic acid on the carrier, carrying out ultrasonic treatment to realize demolding, separating the flaky base material, and calcining to obtain titanium dioxide with uniform particle size. According to the method for preparing titanium dioxide by the template method, the uniformity of the particle size of a titanium dioxide product can be remarkably improved.

The invention discloses a composite lithium ion sieve and a preparation method thereof. In the lithium ion sieve, an active component is a lithium removal product H4Ti5O12-xSx of a precursor Li4Ti5O12-xSx, graphene oxide is used as a carrier, and nanoparticles of the active component H4Ti5O12-xSx are loaded on a single layer of graphene oxide and marked as H4Ti5O12-xSx (at) GO; wherein x is equal to 0.05 to 0.8. According to the preparation method, a sol-gel method and a high-temperature solid-phase method are combined, sulfur-doped spinel type Li4Ti5O12 nanoparticles are loaded on single-layer graphene oxide in situ, and a Li4Ti5O12-xSx precursor is subjected to acid leaching to remove lithium. The lithium ion sieve H < 4 > Ti < 5 > O < 12-x > S < x > (at) GO has high adsorption capacity and lithium ion selectivity and good structural stability and hydrophilicity, and is a reusable efficient lithium ion adsorption material.

The invention discloses a hydrolysis pretreatment method for preparing a titaniferous solution from VTM ironmaking waste residues, and belongs to the technical field of VTM ironmaking waste residue resource utilization. According to the method, targeted treatment is respectively carried out aiming at the obvious difference of components of the titanium liquid prepared from the waste residues (blast furnace slag and gas-based shaft furnace slag) of different sources, and the titanium liquid meeting the requirements of a hydrolysis process is obtained. Through a combined process of MVR concentration, crystallization, separation, purification and drying, aluminum sulfate impurities in the titaniferous solution are efficiently removed, and the titaniferous solution is converted into an aluminum sulfate hexadecahydrate product with a high additional value. The method effectively solves the problems of low TiO2 yield and poor metatitanic acid quality caused by interference of impurity aluminum in the titaniferous solution on hydrolysis and improper concentration of trivalent titanium, realizes accurate regulation and impurity recycling of titaniferous solution components, provides qualified raw materials for subsequent efficient hydrolysis preparation of high-quality titanium dioxide, and is stable in process, economical and environment-friendly.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a method for synthesizing nano lithium titanate, which comprises the following steps: mixing an oxalic acid solution with scrapped denitration catalyst powder, and filtering, washing and drying to obtain acid leaching residues after the reaction is finished; alkali liquor and the acid leaching residues are mixed and then react in a closed reaction kettle, and after the reaction is finished, solid titanate powder is obtained through filtering, washing and drying; the method comprises the following steps: heating and mixing an acid solution and solid titanate powder, cooling, filtering, washing and drying to obtain metatitanic acid powder; adding metatitanic acid powder, a lithium source, deionized water and ball milling balls into a ball milling tank, and drying after ball milling to obtain a lithium titanate precursor; and roasting the lithium titanate precursor in air, and grinding to obtain the lithium titanate powder. According to the method, the nano lithium titanate is synthesized by taking metatitanic acid obtained by resource recovery of the waste denitration catalyst as a titanium source, the reaction process speed is high, the product purity is high, the cost can be effectively saved, mining of mineral resources is effectively reduced, energy is saved, carbon is reduced, and the method has the advantages of environmental protection and green development.

The application relates to a spray drying technology assisted synthesis of barium titanate coated Ni particle material and a method thereof, and belongs to the technical field of metal powder material preparation. The method comprises the following steps: firstly, preparing a mixed solution by mixing metatitanic acid, barium hydroxide and nano and submicron Ni powder; secondly, synthesizing a Ni-based composite material intermediate by adopting a spray drying method; and finally, forming barium titanate coated Ni powder after sintering in a tube furnace. The barium titanate coated Ni inner electrode material is Ni@BaTiO3 spherical particles with a core-shell structure, the particles are core / shell microstructure, the shell layer is a barium titanate coating layer with a thickness of 10-15 nm, and the particle size is 100-150 nm. The required equipment can be scaled, the composition and microstructure are easy to control, the spherical degree and dispersity are high, the compactness is high, the repeatability is good, the particle size and distribution can be changed by adjusting process parameters, the oxidation resistance can be improved, good interface combination between the ceramic dielectric layer and the barium titanate coated Ni inner electrode material can be realized, and key problems such as mismatching of interfacial volume shrinkage and easy cracking in the sintering process can be solved.

The invention belongs to the technical field of titanium alloys, and particularly relates to a high-strength titanium alloy material and a preparation method and application thereof. The high-strength titanium alloy material is prepared from 84 wt%-93 wt% of a titanium alloy matrix, 5 wt%-10 wt% of modified carbon fibers and 2 wt%-6 wt% of high-entropy MAX ceramic. The modified carbon fiber is prepared by the following preparation process: adding metatitanic acid and activated carbon powder into water, heating and stirring to obtain precursor sol; and coating the precursor sol on the surface of the carbon fiber, drying, and calcining in a nitrogen environment to obtain the modified carbon fiber. The titanium alloy material is high in mechanical strength and excellent in overall performance.

The present application relates to the technical field of the preparation of titanium dioxide. Specifically disclosed are a high-brightness and high-whiteness anatase titanium dioxide pigment and a preparation method therefor. A high-brightness and high-whiteness anatase titanium dioxide pigment and a preparation method therefor. The preparation method comprises: adding titanyl sulfate to water at 60-65°C, heating the mixture to 95-97°C at a rate of 2.3-3.5°C / min for hydrolysis, adjusting the pH of the system to 2.2-2.4 during the hydrolysis process, then adding anatase seed crystals, and after the hydrolysis reaction is finished, filtering same to remove the filtrate, so as to obtain metatitanic acid; adding the metatitanic acid to water to undergo pulping dispersion, and adding a reducing agent during the pulping process; then performing acid pickling with sulfuric acid and drying to obtain a crude product; blending, grinding and screening the crude product and a modifier to obtain a modified crude product; and performing jet milling on the modified crude product and a metal salt to obtain the titanium dioxide pigment product. By means of the preparation method for a high-brightness and high-whiteness anatase titanium dioxide pigment of the present application, the product has higher whiteness, stability and tinting strength, and is more suitable for being used in a plastic system.

The invention belongs to the field of inorganic chemical pigments, and relates to a metatitanic acid continuous purifying and bleaching integrated method in a dynamic reaction zone. The method comprises the following steps: firstly, feeding hydrolyzed metatitanic acid slurry into an integrated tower body for primary washing, adding a bleaching agent into the metatitanic acid subjected to primary washing, controlling the acidity and the temperature to fully reduce the bleaching agent and color development impurities, and then, carrying out final cleaning on the bleached metatitanic acid slurry to thoroughly remove reaction products and residual agents, so as to obtain the high-purity metatitanic acid. Qualified metatitanic acid slurry is sent to a calcining process, high-acid wastewater overflowing from the tower top can enter a wastewater recycling process, slightly dirty water flowing out from the lower part can be pumped to the tower top to serve as primary washing supplementary water, and recycling is realized. According to the invention, three intermittent processes are integrated into single equipment, and a stable reaction microenvironment is created and maintained in a flow system through a high-acidity carrier + online feedback control + local thermal compensation technology, so that technical obstacles in a continuous process are solved.

The application relates to the technical field of solid waste resource utilization, and discloses a method for preparing high-purity silicon powder and titanium dioxide based on chlorination waste brine quenching slag, which comprises the following steps: S1, drying and ball milling treatment of the molten salt chlorination waste brine quenching slag to obtain pretreated materials; S2, magnetic separation of the pretreated materials to obtain non-magnetic mixed materials; S3, oxidative roasting of the non-magnetic mixed materials to obtain decarburized solid materials; S4, acid leaching, filtering and washing of the decarburized solid materials to obtain silicon-rich filter cakes and titanium-rich filtrate; S5, drying, grinding and airflow classification of the silicon-rich filter cakes to obtain silicon powder, and hydrolysis reaction of the titanium-rich filtrate after adding a hydrolysis agent and heating, filtration of metatitanic acid filter cakes and calcination and dehydration to obtain titanium dioxide. Through the scheme, the comprehensive recovery rate of silicon and titanium resources and the product added value are improved, and the solid waste emission and environmental pollution are effectively reduced.

The present invention provides a method and application for in-situ online detection of hydrolysis seed quality. Specifically, for the preparation process of added seed crystals, the pH value of the reaction system is tested during the maturation of the hydrolysis seed crystals, and the stability of the hydrolysis seed crystals is determined by the pH value. Specifically, for the hydrolysis process of added seed crystals, the present invention provides a method for in-situ online detection of seed stability. Quantifying seed stability by pH value effectively avoids deviations in seed stability caused by manual judgment due to operator deviations in blue phase identification. This saves time and effort while ensuring consistency in seed quality across multiple batches under the same operating conditions, thereby obtaining metatitanic acid and a final titanium dioxide product of consistent quality.

The present application relates to a kind of green metatitanic acid fast direct transmission deviating crystallization system of green metatitanic acid, including desulfurization tower, induced draft fan, bag dust collector, scattering dryer, high-temperature fan, cyclone one cylinder, suspension calcining furnace, cyclone two cylinders.The present application uses suspension calcining technology to produce titanium dioxide, uses green electricity as electric energy, recycles and utilizes the byproduct carbon dioxide, is conducive to product zero-carbon production, promotes the carbon neutralization of titanium dioxide industry.