| http://www.w3.org/ns/prov#value | - To remove all the unwanted metals such as iron, copper, etc. that may have gone into solution along with gold and silver, the circuit of FIG. 1 may be modified as shown in dash lines so that sodium hydroxide from cathode container 31 is added to the pregnant liquor while the pregnant liquor is mixed uniformly until it has reached a pH rating of 8-9.
|
