39results about "Titanium and titanyl sulfates" patented technology

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for converting titanium dioxide red gypsum into white gypsum and enriching titanium and iron.The method comprises the following steps: preparing white gypsum, preparing the red gypsum, converting the red gypsum into acid white gypsum, and converting the acid white gypsum into the white gypsum; through control of a process and an end point of the reaction, the produced white gypsum can be directly used for a cement factory, and can be deeply processed into building material gypsum with higher added value; through dissolution of the red gypsum by a waste concentrated acid, the red gypsum is converted into the acid white gypsum, and a TiOSO4 and FeSO4 acidic solution with a high concentration is obtained, wherein the recovery utilization rate is 95% or more; and the acid white gypsum is diluted by using titanium dioxide wastewater, and after primary neutralization is performed, thewhite gypsum is obtained. The method provided by the invention has a simple technological process, a stable treatment effect, less equipment investment, no secondary pollution, low treatment costs, considerable economic benefits and broad market prospects.

A process for improving the grade and optical quality of zircon, comprising: baking a mixture of a zircon feed and concentrated sulphuric acid at a baking temperature in the range of from 200 up to 400° C., and for a time to form water leachable sulphates with impurities therein including at least iron and titanium; leaching the baked mixture to dissolve the leachable sulphates; and separating the zircon from the leachate containing the leached sulphates, which separated zircon is thereby of improved grade and optical quality.

The invention belongs to the technical field of titanium dioxide production, particularly relates to a method for reducing acidolysis solid matters in the titanium dioxide production process, and aimsat the problem that in the existing ilmenite acidolysis leaching process, many solid-phase substances remain in an acidolysis tank to cause the situation that compressed air stirring is not uniform so as to cause the problem of pot overflowing due to untimely heat dissipation of the main reaction. According to the method, through comparative research on the acidolysis leaching water flow rate, leaching solid phase temperature, leaching empty flow rate, solid phase dissolving square quantity and acidolysis titanium liquid quality, the residual solid phase square quantity in the acidolysis tankis successfully reduced, the phenomenon of titaniferous solution early hydrolysis possibly caused by high temperature is avoided, and the potential safety hazard of acidolysis main reaction overflowing is reduced. The method is undoubtedly capable of reducing the overall production cost of titanium dioxide and improving the economic benefit for enterprises, and for the whole titanium dioxide industry, the new technology can relieve the dilemma that the production cost is sharply increased and promote the overall development of the titanium dioxide industry.

The invention discloses a three-stage negative pressure evaporation crystallization treatment process and a device for titanium dioxide waste sulfuric acid. The process comprises the following steps:crystallizing and separating of ferrous sulfate in a titanium dioxide waste sulfuric acid stock solution by using a stock solution crystallization system is carried out, and centrifugally separating are carried out to obtain a ferrous sulfate heptahydrate solid and mother liquor; through the cooperative cooperation of a double-effect evaporation system, a single-effect evaporation system and a concentration and crystallization system, the possibility of crystallization and blockage of materials in the evaporator is eliminated, and the stable operation of the device is ensured; centrifugate from the stock solution crystallization system is evaporated and concentrated in the double-effect evaporation system to improve acidity and then is introduced into a front section of the concentration and crystallization system; cooling, crystallizing and filter pressing are carried out to obtain a large amount of sulfate solids; wherein the mass concentration of sulfuric acid in filtrate reaches 50%, the filtrate is continuously introduced into the single-effect evaporation system for forced circulation, the concentration of waste sulfuric acid is increased to the maximum extent, the concentrated waste sulfuric acid solution is introduced into the rear section of the concentration and crystallization system, cooling crystallization is performed, a large amount of sulfate solids are obtained through filter pressing, and a regenerated sulfuric acid solution with the mass concentration larger than or equal to 70% is obtained.

The invention discloses a method for efficiently purifying a titanous sulfate liquid and belongs to the field of separation and purification. The technical problem to be solved by the invention is toprovide the method for efficiently purifying the titanous sulfate liquid with convenience in operation and high purifying efficiency. The method for efficiently purifying the titanous sulfate liquid comprises the step of adopting a high-speed centrifugation technique for separating the titanous sulfate liquid, thereby acquiring a deeply purified titanous sulfate liquid. The purifying process of the titanous sulfate liquid according to the method disclosed by the invention is simple and easy to be controlled, the operation is simple and convenient, the continuous running can be realized, the draining acid gas can be effectively controlled, the environmental condition of the titanium liquid purification process is improved, the green production is easily realized and the efficiency of the titanium liquid purification process is increased.

The invention discloses a new sulfate process titanium dioxide acidolysis method. Sulfuric acid with mass fraction being 98% is utilized to be subjected to a reaction with titanium ore powder, and themain reaction is performed safely by controlling flow of compressed air and frequency of an exhaust draught fan; the method has technical effects as follows: raw material cost is saved, the risk of overflowing in the main reaction is reduced, and the acidolysis rate of ore is increased.

The invention provides a purification method for a titanium sulfate solution which comprises the step of performing centrifugal separation and membrane separation on the titanium sulfate solution to obtain a purified titanium solution. The purification method for the titanium solution disclosed by the invention has a simple technology, can achieve continuous operation, has smaller equipment volume, can effectively control acid gas to be exhausted out, can improve the environment condition of a titanium solution purification procedure and achieves green production. As equipment used by the purification method disclosed by the invention is simple, the purification method is easy to implement and has a good application prospect.

The invention provides a preparation method of a raw material for producing titanium dioxide of decorative base paper, and belongs to the technical field of titanium dioxide of decorative base paper. The method comprises the following steps: A, selecting titanium ore of which the residue on sieve is 10.0-20.0% under 325 meshes and the residue on sieve is 0 under 200 meshes, the water content is not greater than 0.5%, TiO2 is not less than 45%, Fe2O3 is not greater than 8%, and the temperature is not greater than 40 DEG C; selecting sulfuric acid on the concentration of 30-55% and under the temperature of being not greater than 40 DEG C; mixing sulfuric acid and titanium ore; cooling to obtain a titanium ore pre-mixed material; B, feeding the titanium ore pre-mixed material into a reaction tank; stirring; adding sulfuric acid on the concentration of 98%; reacting; then curing; C, cooling the cured material; adding dilute sulphuric acid; then adding sand filtering water to dissolve; D, adding zero-valent iron powder to the dissolved liquid to react; E, precipitating the liquid obtained in the reaction in step D; collecting supernate; filtering to obtain titanous sulfate containing not greater than 30mg/ L of filtrate solid content. The method is stable to operate, high in acidolysis rate, stable in quality index, and stable in quality of titanium dioxide prepared by the sulfuric acid method.

The invention relates to the field of titanium dioxide production, and discloses a titanium dioxide concentration system and a titanium dioxide concentration process, the titanium dioxide concentration system comprises an evaporation module for concentrating light titanium liquid, a condensation module and a heat recovery module; the evaporation module comprises a dilute titanium tank, a heat exchanger, an evaporation chamber, a concentrated titanium tank, a cyclone separator, a primary steam condenser, a secondary steam condenser and a vacuum pump; the dilute titanium tank is connected with the heat exchanger which is connected with the evaporation chamber; the heat exchanger is connected with steam and is connected with the evaporation chamber; the evaporation chamber is connected with the concentrated titanium tank, and the evaporation chamber is connected with the cyclone separator; the cyclone separator is connected with the concentrated titanium tank, the cyclone separator is connected with the primary steam condenser, and the primary steam condenser is connected with the vacuum pump; and the secondary steam condenser is connected with the primary steam condenser, and the secondary steam condenser is connected with the vacuum pump. The method has the effect of relieving the problem that concentration system equipment is corroded by acidic semi-dehydration.

This invention relates to the beneficiation of titanium bearing materials having a substantial component of anatase and/or rutile and/or pseudorutile structure. Such materials include anatase ores andminerals and other sources of anatase, as well as blends or mixtures that include traditional sources of titanium and titanium dioxide such as ilmenite and titanium slag. The invention is of particular, though not exclusive, interest in the processing of anatase materials to titanium dioxide of pigment quality. The process is additionally effective in processing materials having a substantial component of anatase or rutile, e.g. leucoxene.

The invention provides a production method of titanyl sulfate and nano titanium dioxide, which comprises the following steps: by taking ilmenite, metatitanic acid or sulfuric acid leachate of other titanium-containing materials as a raw material, adding a certain amount of concentrated sulfuric acid into the feed liquid, heating to supersaturate titanium, separating out titanyl sulfate crystals, and separating out crystallization mother liquor to obtain a commodity titanyl sulfate; and calcining titanyl sulfate to obtain an anatase type or rutile type nano titanium dioxide product, and carrying out post-treatment to obtain the commodity nano titanium dioxide. According to the technology, equipment of a traditional sulfuric acid method titanium dioxide production process can be completely utilized, additional equipment investment is not needed, and compared with an existing sulfuric acid method titanium dioxide production process, the technology has the advantages of being better in product quality, higher in crystallization speed, wide in feed liquid application range and the like.

According to the present invention, a titanyl sulfate hydrate powder is characterized by containing 25-40% by mass of titanium element in terms of TiO2, 40-60% by mass of sulfur element in terms of H2SO4, and niobium element in such an amount that the molar ratio of niobium element to titanium element (Nb/Ti) is from 0.00005 to 0.012, with the molar ratio of the sulfur element content to the titanium element content (S/Ti) being from 1.1 to 1.5, and is also characterized by containing a crystal of titanyl sulfate dihydrate (TiOSO4*2H2O). Consequently, the present invention is able to provide: a titanyl sulfate hydrate powder which has high rate of dissolution into water; a method for producing this titanyl sulfate hydrate powder; and a method for producing an aqueous titanyl sulfate solution, a method for producing an electrolyte solution and a method for producing a redox flow battery, each of which uses this titanyl sulfate hydrate powder.

The invention relates to the technical field of lithium battery electrode materials, and provides a composite ternary material which has a core-shell structure and comprises a ternary precursor material and a doped metal salt layer coating the surface of the ternary precursor material. The composite ternary precursor provided by the invention contains the doped metal salt layer coated on the surface of the ternary precursor material, after the composite ternary precursor and a lithium source are sintered, a ternary material with uniformly distributed doped metal elements and coated with the metal oxide layer can be formed, the metal doping can effectively inhibit the conversion of the crystal structure of the surface layer of the material in the circulation process, and the coating of the metal oxide layer can avoid the direct contact with electrolyte and inhibit the side reaction, so that the circulation stability of the material can be improved.