SPHENE CONCENTRATE DECOMPOSITION PROCESS Russian patent published in 2005 - IPC

FIELD: inorganic compounds technologies.

SUBSTANCE: invention relates to technology of titanium-calcium mineral raw material, in particular to acid decomposition of sphene concentrate, and can be used to produce titanium dioxide and products based thereof. Prior to be treated with acid, concentrate is subjected to mechanical activation with energy supply intensity 10 kJ/s per 1 kg concentrate within 5 to 30 min. Mechanical activation in carbon dioxide medium is also possible at CO₂ consumption 0.2-0,8 mole/mole CaO. For acid treatment of concentrate, 15-20% nitric acid is used at ambient temperature and atmospheric pressure, wherein additional titanium is transferred into solution. Resulting reaction mass is filtered to separate silica residue.

EFFECT: increased feasibility of process due to reduced acid treatment temperature and allowed atmospheric pressure.

2 cl, 5 ex