Roasting concentrates to give a calcine that can be leached by ordinary methods has been the basis of much work and many patents. ... costs by present methods may aid is limited by the fact that direct metallurgical cost is only a fraction of the whole cost. ... Since both iron and sulphur are elements of potential economic value their discard after they are at hand in ... of a gram-atom of carbon will be required per gram-mole of sulphur dioxide and one half gram-atom of carbon will beanbsp;...
|Title||:||Bureau of Mines Report of Investigations|