Method for determining the roasting conditions for copper concentrate and method for roasting copper concentrate

摘要

PROBLEM TO BE SOLVED: To confirm that the grade of arsenic in a copper concentrate has been reduced. SOLUTION: A method for determining a roasting condition of a copper concentrate is from the copper concentrate by roasting the copper concentrate containing arsenic in the furnace while supplying a gas containing oxygen to the furnace. A step of causing the reaction of volatilizing arsenic, a step of measuring the oxygen partial pressure of the gas discharged from the furnace with a zirconia oxygen concentration meter, and a period during which the oxygen partial pressure is 10-14 atm or less are predetermined. It is characterized by having a step of determining that the reaction is completed when the rate of increase in the oxygen partial pressure exceeds a predetermined value after continuing for the time of. [Selection diagram] Fig. 5