摘要:
A method of recovering titanium from perovskite by leaching with a strong sulfuric acid solution is disclosed. The leaching produces a sulfate solution containing titanium and a calcium sulfate residue when the time and temperature of leaching are controlled as a function of the grind size of the perovskite and concentration of the sulfuric acid. The titanium-containing solution and the calcium sulfate residue are then separated. The titanium in the leach solution is precipitated by heating, as a mixture of titanium sulfates, which are then redissolved in water or dilute acid solution. Titanium dioxide may then be prepared by hydrolysis of the titanium in the resulting aqueous solution.
摘要:
A process is provided for the manufacture of titanium compounds and particularly titanium dioxide wherein excess titaniferous bearing material is reacted with dilute sulfuric acid having a concentration of between about 25% and about 60% by weight at a temperature below about 140.degree. C., and in the presence of a reducing agent which affects the reduction of ferric iron to ferrous iron. Thereafter, the titanium sulfate may be recovered or further processed to provide titanium dioxide hydrate accompanied by recycling the spent acid for reaction with the titaniferous bearing material charged to the process. The titanium hydrate may be calcined to provide titanium dioxide.
摘要:
This invention relates in general to a method for the preparation of a titanium dioxide composition which possesses photosensitive properties useful in commercial systems designed to respond to exposure to light i.e., photographic emulsions, copy paper and the like.
摘要:
THIS INVENTION RELATES IN GENERAL TO A PROCESS FOR PREPARING A HIGH QUALITY TITANIUM DIOXIDE PIGMENT IN WHICH THE TITANIUM DIOXIDE IS IN THE ANATASE CRYSTAL FORM. THE PROCESS COMPRISES HYDROLYZING IN A PARTICULAR MANNER THE TITANIUM VALUES FROM A TITANIUM SULFATE-FERROUS SULFATE SOLUTION IN WHICH THE CONCENTRATION OF TITANIUM IS FROM 80 TO 180 G.P.L. CALCULATED AS TIO2 AND TREATING AND CALCINING THE HYDRATE SO FORMED TO PRODUCE A HIGH GRADE ANATASE TIO2 PIGMENT. USING THE HYDROLYSIS PROCESS OF THE INSTANT INVENTION, A HIGH GRADE ANATASE TITANIUM DIOXIDE PIGMENT MAY BE PRODUCED FROM A TITANIUM SULFATE-FERROUS SULFATE SOLUTION WITHOUT UTILIZING THE CONVENTIONAL CRYSTALLIZATION STEP FOR REMOVING MOST OF THE IRON VALUES NOR THE CONCENTRATION STEP FOR INCREASING THE TITANIUM CONTENT IN THE LIQUOR TO AT LEAST 200G.P.L. TIO2.
摘要:
A process for producing a particulate TiO2 includes supplementing metatitanic acid with an alkali compound in a quantity of 1200 ppm to 2400 ppm of alkali, with a phosphorus compound in a quantity of 0.1 wt.-% to 0.3 wt.-% by weight of P, expressed as phosphorus, and with an aluminum compound in a quantity of 1 ppm to 1000 ppm of Al, expressed as Al, to obtain a mixture. The quantity of the alkali compound, of the phosphorus compound, and of the aluminum compound are with respect to the TiO2 content. The mixture is calcined at a constant temperature of 940° C. to 1020° C. until a numerical fraction X50 of TiO2 has a primary crystallite size of at least 200 nm, to obtain a calcined mixture. The calcined mixture is cooled to obtain a cooled calcined mixture. The cooled calcined mixture is grinded to obtain the particulate TiO2.
摘要:
The invention relates to a process for extracting metals and salts from titanium-bearing minerals such as perovskite. More particularly, although not exclusively, the invention relates to extracting titanium dioxide and optionally other compounds from melter slag derived from an iron-making process.
摘要:
A white pigment dispersion includes 10 to 60 wt % of low effective density TiO2, 1 to 40 wt % of a latex, and the balance a dispersing medium. Inks using the low effective density TiO2 and methods for preparing the low effective density TiO2 are also disclosed.
摘要:
The present invention provides a process for producing a concentrated aqueous nano titania sol in the mild pH range (4.0 to 10.0) comprising contacting an acidic nano titania sol with a dispersant and with an alkalizing agent, and subjecting the nano titania sol to membrane filtration until the nano titania sol contains more than 300 g TiO2 nanoparticles/dm3. The nano titania sol may further be subjected to a coating treatment within any of the steps of the above described process. The concentrated aqueous nano titania sol of this disclosure is suitable for use in a variety of applications, including providing UV protection and photochemically degrading or inactivating contaminants.
摘要翻译:本发明提供了一种在温和pH范围(4.0至10.0)中生产浓缩的纳米二氧化钛水溶液的方法,包括使酸性纳米二氧化钛溶胶与分散剂和碱化剂接触,并使纳米二氧化钛溶胶进行膜过滤直到 纳米二氧化钛溶胶含有超过300g TiO 2纳米颗粒/ dm 3。 可以在上述方法的任何步骤中进一步对纳米二氧化钛溶胶进行涂覆处理。 本公开的浓缩水性纳米二氧化钛溶胶适用于各种应用,包括提供UV保护和光化学降解或灭活污染物。