Ion exchange resin method, ion exchange reaction of adsorption process

The method of adsorbing and recovering gold from an cyanide slurry using an ion exchange resin is called an ion exchange resin method, and is also called a resin slurry method (abbreviated as RIP method).
Ion exchange resins are composed of ionized groups that are capable of dissociating in solution. This group can be dissociated into two parts, one being a solid ion (indicated by R) that cannot be ion exchanged, and the other being a reverse of the opposite sign of the fixed ion charge. The cation exchange resin and the anion exchange resin are classified according to the symbol of the counter ion charge in the ion exchange resin.
In pulp cyanide leaching, gold is Au (CN) ₂ ^- anion complex form, so the use of gold ion exchange resin method, using an anion exchange resin only. When gold is extracted from the cyanide leaching slurry, the gold and silver cyanide complex ions dissolved in the resin and the slurry undergo the following ion exchange reaction through the adsorption mechanism of the ion pair:

Since the complex anion formed by side reactions such as non-ferrous metal ions and cyanogen occupies a considerable part of the active gene in the resin, the effective capacity of the resin to adsorb gold and silver is lowered, and sometimes the impurities adsorbed on the resin are several times that of gold, thus affecting The resin adsorbs the selectivity of gold and silver.

Double Shafter Crusher