The forms of gold, silver and copper in the blast furnace slag are investigated by means of (1) microscopic examination, (2) chemical analysis, (3) oil flotation and (4) operation in an electric furnace. The special features of this work are to separate sulphide prills bearing gold, silver and copper from the slag and examine their properties directly.
The author has discussed on (1) the different forms in which gold, silver and copper occur in the slag and (2) the method of recovering these valuable metals and reached to the conclusions.
The method above mentioned consists in receiving fused slag from the blast furnace in the electric furnace and heating it some while adding iron pyrite thereto, causing the low grade matte thus produced to collect the sulphide prills. Small particles of metallic iron reduced by the carbon electrode from the slag act also as a strong collecter of gold as well as metallic sulphides. Thus the loss of the metals into the slag has been reduced to one half.
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