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ES65105A1917-07-281917-07-28El tratamiento de minerales sulfurados o carbonatados normalmente inutilizables a consecuencia de un exceso de cal.
ExpiredES65105A1
(es)
Un procedimiento, con el aparato correspondiente, para tratar minerales súlfidos, para separar de ellos el sulfuro y para fabricar albayalde sublimado y óxido de zinc.