C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/12 (2006.01) C22B 3/14 (2006.01) C22B 3/20 (2006.01) C22B 7/00 (2006.01) C22B 7/02 (2006.01) C22B 19/28 (2006.01) C22B 19/30 (2006.01)
Patent
CA 2192084
This process allows the elimination of contaminants from waelz oxide, (chlorine, sodium, potassium, sulfur and fluorine, fundamentally), by means of its hydrometallurgic treatment in the following stages - Leaching with sodium carbonate in warm aqueous alkaline medium. - Solid - liquid separation of the effluent and the solid material. - Purification of the effluent by the elimination of the heavy metals, and optionally, the undesired anions. - Washing with water of the solid material obtained after-the sodium leaching. - Solid - liquid separation of the water and the purified waelz oxide. - Recirculation and warming of the effluent obtained from the washing stage, for its reutilization in the sodium leaching stage.
Ce procédé permet l'élimination de contaminants dans un oxyde de Waelz, (chlore, sodium, potassium, soufre et fluor essentiellement), par traitement hydrométallurgique comprenant les étapes suivantes: lixiviation par du carbonate de sodium en milieu aqueux alcalin, à chaud; séparation solide-liquide de l'effluent et du matériau solide; purification de l'effluent par élimination des métaux lourds et éventuellement des anions indésirés; lavage à l'eau du matériau solide obtenu après lixiviation sodique; séparation solide-liquide de l'eau et de l'oxyde de Waelz purifié; recirculation et chauffage de l'effluent obtenu dans l'étape de lavage afin de le réutiliser dans la lixiviation sodique.
Danobeitia Sierra Iker
Goicoechea Gandiaga Nestor
Vallejo Ochoa de Alda Javier
Macrae & Co.
S.a.) Compania Industrial Asua-Erandio S.a. (aser
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