The present disclosure relates to methods of preparing sols of titanium dioxide nanoparticles that are photoactive, neutral, and in a substantially concentrated form. The methods particularly provide for concentrated sols in light of washing and dewatering under low cation concentrations and utilizing rapid peptizing through addition of the filter case to the peptizing agent. Concentrated acid may be utilized to maintain high TiO.sub.2 concentration while still avoiding precipitation of the colloidal TiO.sub.2. Concentrated photoactive, neutral titanium dioxide sols are also provided as well as compositions thereof and photoactive coatings formed therewith.

The invention relates to a process for producing a titanium dioxide pigment obtainable by the sulfate process with a narrow particle size distribution, the pigment itself, and the use of said pigments in coatings and printing inks.

Provided are a self-cleaning coating, a self-cleaning fiber, a self-cleaning carpet and uses thereof. The self-cleaning coating is provided with a porous structure where pores communicate with one another; the volume of the pores comprised in the coating makes up 20%-98% of the total volume of the coating; and the pore diameter of the pores in the porous structure is between 0.5 nm-50 nm. The self-cleaning coating is mainly prepared from host materials; the host materials are one or more of titanium oxide, zirconia, titanium nitride, silicon oxide, tungsten oxide, g-C.sub.3N.sub.4 semiconducting polymer, perovskite semiconductor, silver, iron, gold, aluminum, copper, zinc, tin and platinum.

A method for manufacturing low effective density TiO.sub.2 includes providing a template having a surface. The template surface is coated with a titanium-containing compound that can be reduced to TiO.sub.2 at high temperature. The template is removed, thereby forming porous TiO.sub.2 particles. The effective density of the porous TiO.sub.2 particles is less than 4.

A method for manufacturing low effective density TiO.sub.2 includes providing a template having a surface. The template surface is coated with a titanium-containing compound that can be reduced to TiO.sub.2 at high temperature. The template is removed, thereby forming porous TiO.sub.2 particles. The effective density of the porous TiO.sub.2 particles is less than 4.

A white pigment dispersion includes 10 to 60 wt % of low effective density TiO.sub.2, 1 to 40 wt % of a latex, and the balance a dispersing medium. Inks using the low effective density TiO.sub.2 and methods for preparing the low effective density TiO.sub.2 are also disclosed.

The invention relates to a process for producing a titanium dioxide pigment obtainable by the sulfate process with a narrow particle size distribution, the pigment itself, and the use of said pigments in coatings and printing inks.

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.

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.

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.