Abstract: In the process for producing titanium dioxide by (a) reacting titanium tetrachloride and oxygen in the vapor phase in a reactor to produce titanium dioxide, and (b) subsequently cooling the titanium dioxide by passing it through a flue consisting of a conventional flue, a finned flue, or combinations thereof, wherein the outlet for the reactor in step (a) has a smaller interior diameter than the inlet for the flue in step (b),the improvement comprising passing the titanium dioxide through a truncated cone-shaped finned flue conduit, the smaller diameter end of the truncated cone-shaped finned flue conduit receiving titanium dioxide produced by the reactor and the larger diameter end of the truncated cone-shaped finned flue conduit discharging titanium dioxide that is received by the flue.

Abstract: A process for coating at least one cationically charged ketene dimer on titanium dioxide comprising grinding the titanium dioxide in acidic aqueous media in the presence of a cationically charged ketene dimer.

Abstract: In the process for cooling the reaction products of the vapor phase oxidation of titanium tetrachloride to titanium dioxide comprising: (a) passing said reaction products through an externally cooled conduit, and (b) admixing with the reaction products particulate scrubbing material which removes solid deposits adhered to the interior walls of the conduit, the improvement characterized by:using as the scrubbing material about 0.5-15 percent by weight, based on the weight of titanium dioxide, of compacted particles of titanium dioxide pigment, said compacted particles of titanium dioxide pigment being produced by subjecting titanium dioxide pigment to sufficient pressure to form same.

Abstract: A method and apparatus for transporting solid particulate material and calculating mass flow rate of the material through a rotary feeder having helical pockets is provided. At least one radiation source and two or more detectors are positioned in a manner whereby radiation flux is directed through, and attenuated by particulate material contained in a helical pocket. The amount of attenuation is measured at least when the pocket is filled with material and when the pocket has discharged most of the material. The difference in the amount of flux detected at the filled and discharged positions is used to determine the mass flow rate of the particulate material.

Abstract: Titanium dioxide pigment prepared by the high pressure (e.g., 10-200 PSIG) oxidation of TiCl.sub.4 vapor is improved with respect to carbon black undertone, specific surface area, and gloss properties by the addition of a nucleant consisting essentially of a cesium substance which is present in the amount of about 8-2,000 parts per million, based on the weight of the TiO.sub.2. The foregoing process is also used wherein the residence time of the reactants in the mixing zone of the reactor is about 1-16 milliseconds.

Abstract: Disclosed is a process for beneficiating titaniferous material which contains iron oxide. The titaniferous material is mixed with a molten salt or mixture or molten salts in which iron oxide dissolves to produce iron ions and oxyanions. The iron ions are electrolytically reduced to iron at the cathode and deposited as high purity iron on the cathode. The oxyanions react with a carbonaceous anode to generate CO and/or CO.sub.2. A beneficiated TiO.sub.2 product is recovered from the molten salt or mixture of molten salts.

Abstract: The invention provides an improved method and apparatus for feeding solids to a fluidized bed reactor. A back pressure control valve regulates the pressure drop between the pressure above a solids column in a standpipe and the pressure in the reactor. Solids are fed from the standpipe via a conduit without valve means, the conduit contains a bend of an angle greater than the angle of repose of the solids.

Abstract: This invention relates to a process for reducing odor perceived by a nearby community from an odor-emitting system, e.g., sewage treatment, etc., by adsorbing on core particles, as described, condensible components present in the system. The malodorous components then cannot adsorb in a film of condensible components on the aerosol to be carried by the aerosol plume into the surrounding community, but remain with the humid gas plume to be dispersed upward into the atmosphere. The process is useful for any system which contains condensible components and malodorous components and whose emissions form aerosols.

Abstract: The amount by weight of TiO2 per gallon of paint in a paint sample is determined by X-ray fluorescence spectroscopy. The sample is prepared by weighing a portion of the sample while wet and then drying the sample. The dried sample is then calcined to produce an ash residue, which is weighed. The ash residue is then ground and heated to drive off any remaining moisture before being fused with a flux material into a glass bead. The amount of TiO2 in the fused glass bead is determined by an X-ray fluorescence instrument which has been previously calibrated with similar fused glass beads having known amounts of TiO2. The quantitative result of the X-ray fluorescence determination is then extrapolated back to determine the pounds of TiO2 per gallon of paint.

Abstract: Process for purifying TiO.sub.2 ore consisting essentially of subjecting the ore to two or more leaching treatments, said leaching treatments alternating between use of an aqueous solution of a mineral acid and an aqueous solution of an alkali metal compound selected from the group consisting essentially of alkali metal carbonates, hydroxides or mixtures thereof.

Abstract: Pigments are disclosed which consist essentially of rutile TiO.sub.2 particles bearing coatings comprising SiO.sub.2 and B.sub.2 O.sub.3.

Abstract: A pigment consisting essentially of rutile TiO.sub.2 particles coated with alumina or alumina-silica, and having particle surfaces associated with cerium cations and borate anions or water-soluble polyfunctional organic acid anions, is useful in coating compositions.

Abstract: Agglomerates of spheroidal masses of malachite crystals are prepared so that they contain silicic acid. These agglomerates can be used to prepare a copper-acetylide complex, which in turn can be used as a catalyst for the preparation of 1,4-butynediol from acetylene and formaldehyde.