Continuous non-polluting liquid phase titanium dioxide process

C - Chemistry – Metallurgy – 01 – G

Patent

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Details

C01G 23/02 (2006.01) B01J 8/08 (2006.01) B01J 8/22 (2006.01) C01G 23/053 (2006.01) C22B 3/00 (2006.01) C22B 34/12 (2006.01)

Patent

CA 2323671

A process and apparatus for producing titanium dioxide from titanium ore or slag is disclosed. The ore or slag (2) is reacted with sulfuric acid (3) in a reactor (1) in which hot gas for agitation (4) is used. Makeup acid from line (6) is fed to line (3). Together with recovered acid from the spray evaporator (34) reacted product overflows from the reactor to rotary filter (8). The filter cake is washed in the rotary filter whose water comes in through line (14). The washed filter cake is delivered to dissolving tank (10). Concentrated acid together with wash water is returned to the reactor through line (3). Filtrate is hydrolized in hydrolysis tank (21) to form titanium dioxide hydrate which is then calcined in a fluid bed calciner (30) to form titanium dioxide.

L'invention a trait à un procédé, ainsi qu'à l'appareil correspondant, permettant de produire du dioxyde de titane à partir de minerai ou de crasses de titane. On fait réagir le minerai ou les crasses (2) avec de l'acide sulfurique (3) dans un réacteur (1) dans lequel on utilise un gaz chaud pour mise en suspension. De l'acide d'appoint provenant d'un conduit (6) est amené sur un conduit (3). Le produit réagi déborde, en compagnie de l'acide récupéré de l'évaporateur à pulvérisation (34), du réacteur vers un filtre à tambour (8). Le gâteau de filtration est lavé dans le filtre à tambour recevant de l'eau par un conduit (14). Le gâteau de filtration lavé est dirigé sur une cuve de dissolution (10). L'acide concentré et l'eau de lavage sont renvoyés au réacteur par un conduit (3). Le filtrat est hydrolysé dans un réservoir hydrolytique (21) pour former un hydrate de dioxyde de titane qui est ensuite calciné dans un four à calciner à lit fluidisé (30) afin de former du dioxyde de titane.

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