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Perfectionnements apportés aux procédés pour chauffer, fondre ou volatiliser diverses substances ou matières applicables notamment à l'extraction des métaux de leurs minerais
Procédé pour le traitement de minerais sulfureux d'antimoine et d'arsenic, destiné à extraire ces métaux et à séparer simultanément les métaux précieux contenus, le cas échéant, dans la gangue