Treatment of gases and vapours evolved during the treatment of Ti contg. materials with H2SO4 is claimed. During those parts of the process in which large amounts of vapours are emitted these are at least partially condensed by passage through a hollow cylinder through which a recycling liquid is circulated. During the complete duration of the operation an alkaline liquid is introduced as a fine spray at several positions into the stream of gases and vapours. This is sepd. off from the process and is at least partially recycled. The feed to each position can be controlled in quantity, concn. and degree of atomisation. The exhaust gas after passage through the cylinder contg. the recirculating liquid enters a residence zone before it enters the chimney. Used with titanium extn. processes. Process ensures complete removal of noxious gases and vapours esp. SO3 and SO2. It gives this at all stages of the acid treatment, combining it with sparing alkali usage and permitting variations in the ratio not only between treatments but also during them.

Mauer Josef Dipl Ing

Papers

Treatment of exhaust gases from titanium separation - using alkaline liquor sprays