Recovery of titanium from perovskite using sulfuric acid leaching
    31.
    发明授权
    Recovery of titanium from perovskite using sulfuric acid leaching 失效
    使用硫酸浸出从钙钛矿中回收钛

    公开(公告)号:US4552730A

    公开(公告)日:1985-11-12

    申请号:US644303

    申请日:1984-08-27

    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.

    摘要翻译: 公开了通过用强硫酸溶液浸出从钙钛矿中回收钛的方法。 当浸出的时间和温度作为钙钛矿的研磨尺寸和硫酸浓度的函数控制时,浸出产生含有钛和硫酸钙残余物的硫酸盐溶液。 然后分离含钛溶液和硫酸钙残余物。 浸出溶液中的钛通过加热作为硫酸钛的混合物沉淀,然后将其再溶解在水或稀酸溶液中。 然后可以通过在所得水溶液中水解钛来制备二氧化钛。

    Process for manufacturing titanium compounds using a reducing agent
    32.
    发明授权
    Process for manufacturing titanium compounds using a reducing agent 失效
    使用还原剂制造钛化合物的方法

    公开(公告)号:US4288415A

    公开(公告)日:1981-09-08

    申请号:US151998

    申请日:1980-05-30

    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.

    摘要翻译: 提供了一种用于制造钛化合物,特别是二氧化钛的方法,其中过量含钛材料与稀硫酸在低于约140℃的温度下与约25%至约60%重量的浓度反应,以及 在还原剂存在下,这种还原剂会影响三价铁还原成二价铁。 此后,可以回收或进一步处理硫酸钛以提供二氧化钛水合物,伴随着废弃的酸再循环,以与装入该方法的含钛负载材料反应。 可以将钛水合物煅烧以提供二氧化钛。

    Preparation of titanium dioxide pigment having the crystal structure of anatase
    34.
    发明授权
    Preparation of titanium dioxide pigment having the crystal structure of anatase 失效
    具有晶状体晶体结构的二氧化钛颜料的制备

    公开(公告)号:US3625650A

    公开(公告)日:1971-12-07

    申请号:US3625650D

    申请日:1969-08-27

    申请人: NL INDUSTRIES INC

    CPC分类号: C01G23/0532 C01P2006/60

    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.

    Stable nano titania sols and a process for their production
    40.
    发明授权
    Stable nano titania sols and a process for their production 有权
    稳定的纳米二氧化钛溶胶及其制备方法

    公开(公告)号:US09382128B2

    公开(公告)日:2016-07-05

    申请号:US13394461

    申请日:2010-09-10

    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。