Process for concentrating thin acid by utilizing process heat in a forced circulation evaporator system

摘要

Dilute sulfuric acid circulating in a titanium dioxide manufacturing plant is concentrated using a heat exchanger heated by gases exhausted from the steam jet mill used in TiO2 manufacture. The dilute acids are passed through a forced circulation evaporating plant consisting of the tubular heat exchanger and an evaporation vessel. The hot exhaust gases from the steam jet mill are passed through a dust filter on their way to the heat exchanger. The H2SO4 is concentrated to about 42-52 wt.%.