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ES1246A1880-11-091880-11-09La extracción en frío o en caliente por vía húmeda del níquel, cobalto y plomo de todos los minerales que los contienen.
ExpiredES1246A1
(es)
Un nuevo procedimiento de Hidro-Metalurgia para la separación del oro, plata, cobre, níquel, cobalto, etc., y por extensión de todos los demás metales de los grupos de los nombrados de los minerales que los contengan, por medio de la cloruración en frío o