Method for producing barium sulfate, barium sulfate and the...

C - Chemistry – Metallurgy – 01 – F

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C01F 11/46 (2006.01)

Patent

CA 2374726

The invention relates to a method for the continuos production of micro- crystalline lead sulfate particles, whereby a barium salt solution and a sulfate solution are simultaneously brought into contact with each other in a precipitating suspension and constantly stirred, the precipitating suspension is continuously removed and the barium sulfate precipitation is filtered and washed. In order to produce flake-shaped and/or needle-shaped barium sulfate particles, the barium salt solution concentration ranges between 0.1 to 0.8 Ba2+ mol/l and the sulfuric acid concentration ranges between 0.1 to 2.0 SO42- mol/l, whereby throughput and stirring speeds are adjusted at a constant precipitation volume in such a way that a pH value of 1 to 9 is obtained in the precipitating suspension.

L'invention concerne un procédé pour produire en continu des particules de sulfate de plomb microcristallines. Ce procédé consiste à mettre en contact simultanément une solution de sel de baryum avec une solution de sulfate dans une suspension de précipitation agitée de manière constante, à prélever en continu la suspension de précipitation et à filtrer et laver le dépôt de sulfate de baryum. Pour permettre la production de particules de sulfate de baryum sous forme de paillettes ou d'aiguilles, la solution de sel de baryum présente une concentration de Ba?2+¿ comprise entre 0,1 et 0,8 mol/l et l'acide sulfurique présente une concentration de SO¿4??2-¿ comprise entre 0,1 et 2,0 mol/l. Le débit et la vitesse d'agitation sont réglés, pour un volume de précipitation maintenu à un niveau constant, de sorte que la suspension de précipitation présente un pH compris entre 1 et 9.

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