B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 1/14 (2006.01) B01D 47/10 (2006.01) C01B 17/88 (2006.01) C01G 23/053 (2006.01) C22B 34/12 (2006.01)
Patent
CA 2050710
28 ABSTRACT The invention relates to a process for the preconcentration of the waste acid obtained in the production of titanium dioxide by the sulphate process and to the use of a device for this process. It utilizes the heat of the hot unpurified calciner exhaust gases obtained in the calcining of titanium dioxide hydrate, waste acid being fed into an acid circuit, the recirculating acid being directly contacted in a venturi scrubber with the calciner exhaust gases, and part of the recirculating acid being withdrawn from the acid circuit.. in the form of preconcentrated acid. Part of the recirculating acid is rapidly mixed with the calciner exhaust gases at the upper end of the venturi scrubber, a second portion is applied, at the same level, via a weir, onto the interior wall of the venturi scrubber and, in the venturi neck, mixed with .the calciner exhaust gases. Below the venturi scrubber, the calciner exhaust gas is separated from the acid. The acid is preconcentrated from between 20 and 24% H2SO4 to between 25 and 28% H2SO4 and the calciner exhaust gas is cooled preferably from between 250 and 400°C to between 85 and 100°C.
Boehm Ernst
Dirichs Peter
Hartmann Achim
Schonherr Dietrich
Boehm Ernst
Dirichs Peter
Hartmann Achim
Kronos Inc.
Kronos Titan G.m.b.h.
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