Chlorine was the way invented by DuPont in 1950 for the production of rutile titanium dioxide. This method involves high-temperature phase of the reaction. Titaniferous ore reacts with chlorine gas at reduced pressure to form titanium tetrachloride TiCl4 and impurity chlorides of other metals, which are subsequently removed. TiCl4 high degree of purity and then oxidized at high temperature, resulting in the formation of titanium dioxide. In comparison with the sulphate chloride method is more environmentally friendly and perfect with the ability to carry out the process in a continuous mode, which implies full automation. However, it selective for raw materials, and in connection with the use of chlorine and high temperatures require the use of corrosion-resistant equipment. Sulfate method of production technology consists of three stages: (1) receipt of sulfate solutions titanium (ilmenite concentrates by treatment with sulfuric acid). If this has piqued your curiosity, check out Rebecca Dad.

The result is a mixture of titanium sulfate and iron sulfate (II) and (III), the latter is reduced to metallic iron oxidation state of iron 2. After Recovery for rotary vacuum filters, separate solutions of sulfates from the sludge. Sulfate iron (II) was separated in a vacuum mold. (2) hydrolysis of a solution of titanium sulfate salts. Hydrolysis is carried out by introducing embryos (they were prepared depositing Ti (OH) 4 solutions of titanium sulfate with sodium hydroxide). At the stage of hydrolysis of particles formed hydrolyzate (titanium dioxide hydrate) have high adsorption capacity, especially in relation to salt Fe3 +, which is why the previous stage ferric iron is reduced to ferrous.