Title: Studies on the Beneficiation of the "Shirasu" as a Mineral Resource (III)
Abstract:The "Shirasu" is one of the acidic volcanic ejectas which occurs widely in Southern Kyushu. Authors have tried to utilize it as a mineral resource for some industrial materials, through reduction of i...The "Shirasu" is one of the acidic volcanic ejectas which occurs widely in Southern Kyushu. Authors have tried to utilize it as a mineral resource for some industrial materials, through reduction of iron content by high magnetic density separation.At first, we have decided the best condition for magnetic separation of the "Shirasu". Then having separated it into the crystalline minerals and the volcanic glass, we investigated the lowest iron content in each fraction through magnetic separation. And according to the data obtained from the various kinds of experimental conditions, we have described the "Magnetic Separata-bility Curve" which corresponds to the " Washability Curve" in coal preparation.Through these experiments, it has been found that the lowest iron content of the concentrate of crystalline minerals is 0.2-0.4% Fe2O3, while that of volcanic glass is 1.2-1.5% Fe2O3, and also that the crystalline minerals have higher magnetic separatability than the volcanic glass.Read More