Show FIRE CONCENTRATION New Process Which Claims Improvement Improve-ment on Local Methods Jn the Knudson pyritic smelting process pro-cess the ore Is treated In a specially designed converter with only one percent per-cent of fuel and n fortyfive to fifty five per cent mate is produced l says a scientific publication The converter Is I lined with magnesia brick The blast ut tho beginning of the operation is carried at about 375 pounds and at the latter end Is raised to something above atmospheric pressure A mixture mix-ture of slag and matte IB formed the slag gradually separating Upon completion com-pletion of the blow the matte Is tapped Into a second converter and Is there blown Into black copper With n charge of seven metric tons in the converter the first operation look four hours and thirty minutes The cost la said to be low and the process has the advantage ad-vantage of compactness of plant and uninterrupted operation |