Stirring reaction tank, stirring reactor, and method for controlling chlorine leaching reaction redox potential

摘要

PROBLEM TO BE SOLVED: To provide a stirred reaction tank, a stirred reaction device and a method for controlling chlorine leaching reaction oxidation-reduction potential, when nonferrous metal is leached from nonferrous metal sulfide-containing nonferrous metal raw material using a chlorine gas, which can obtain the high leaching rate of a metallic element(s) without causing the reduction in the availability of the chlorine gas and the increase in a sulfur oxidation rate.SOLUTION: Using a stirred reaction tank 50 provided with: a chlorine gas feeding part 30 including a chlorine blowing nozzle 32 in which the position in the tank of a nozzle tip part 32A provided with a chlorine blowing port 31 is freely adjusted from the outside of the tank; and sensors 40A, 40B for measuring oxidation-reduction potential of measuring oxidation-reduction potential at a plurality of positions including the upper part of the tank and the lower part of the tank, a chlorine gas is fed into the tank by the chlorine gas feeding means, whether or not a difference in the oxidation-reduction potential measured values obtained with the sensors lies within a prescribed value is determined by a controller 60, and the control of moving the tip position of the chlorine blowing nozzle in the stirred reaction tank till the difference reaches within the prescribed value is performed.