The present invention relates to a process for producing a titanium oxide thin film, said process comprises soaking a substrate in an aqueous solution containing 10 -9 to 9×10 -2 mol/L of a titanium fluoro complex compound in the presence of a fluoride ion capturing agent to form a titanium oxide thin film on the surface of the substrate; and a photocatalyst comprising the titanium oxide thin film thus produced; and can provide a simple process for the formation of a highly homogeneous titanium oxide thin film which is fast and corrosion resistant, and has a high refractive index and a catalytic activity for the photoreaction.

Process for producing titanium oxide thin film, and photocatalyst

Crystallized anhydrous zilpaterol hydrochloride having less than 5% of the crystals with a size of less than 15 microns and at least 95% of the crystals having a size of less than 250 microns and a process for its preparation and novel intermediates.

Crystallized zilpaterol hydrochloride

The invention discloses a potassium fluotitanate preparation technology and a preparation device thereof. The preparation technology comprises the steps of: A, adding ilmenite powder into a reactor, and adding purified hydrofluoric acid and a peroxide solution for full infiltration to prepare fluotitanic acid; B, adding the potassium chloride solution after the fluotitanic acid is cooled so as to generate potassium fluotitanate precipitation; and C, adding the potassium carbonate solution into a novel reaction system consisting of filtrates, removing the Fe element by forming Fe(OH)3 flocks, and recovering the potassium chloride and potassium fluoride solutions. In the reaction system of the invention, Fe2 + in the ilmenite powder are all oxidized into Fe3 + by adding an appropriate amount of peroxide, and then an appropriate amount of K2CO3 solution is added to remove and recycle the Fe3+ in the mode of Fe (OH) 3 precipitate; and an reaction device is reasonably improved so as to fully condense and recycle the hydrofluoric acid in the reaction system, and the whole reaction system can basically realize 'zero emission' of pollutants.

Potassium fluotitanate preparation technology and preparation device thereof

A process for recovering alkali titanium fluoride salts suitable for commercial use from spent pickle acid liquors containing titanium by adjusting the fluoride to titanium mole ratio to critical ranges, adding an excess of alkali metal salt, and gently agitating the resulting solution at a temperature of at least 22° C. to crystallize out the alkali metal titanium fluoride salt. The resulting filtrate can be neutralized with lime to yield a much reduced quantity of environmentally safe solid wastes compared with current neutralization practices where a titanium salt is not first recovered. (Optionally, in some cases, the filtrate can be recycled back to the acid pickling operation.) The liquid waste from filtering the neutral solids is low in metals and fluorides and generally acceptable for discharge to public treatment systems.

Process for recovering alkali metal titanium fluoride salts from titanium pickle acid baths

Process for the preparation of alkali metal fluotitanates by fluorination of a titanium ore, reaction with an alkali metal compound, precipitation and separation of the formed alkali metal fluotitanates, wherein the titanium ore is mixed with a hydrofluosilicate solution, the resulting suspension is evaporated at a temperature of 90°-110° C., the residue is subsequently taken up in water or in a mineral acid and the residue solution is neutralized with an alkali metal compound.

Process for the preparation of alkali metal fluotitanates

A process is provided for recovering fluorine from dilute hydrofluoric acid solutions, such as waste scrubber solution obtained in the treatment of phosphates. The dilute solution is used to react with oxidic titanium material to solubilize the contained titanium and subsequently form, in the presence of potassium ions, crystals of K 2 TiF 6 which are commercially useful as a grain-refining agent in the manufacture of aluminum alloys.

William C. Warneke

Papers

Production of potassium hexafluotitanates using dilute hydrofluoric acid