2019 1000 kg/ barth Desorption and electrowinning equipment/electrolyte tank for cip plant

Product Application

After the active carbon has adsorbed the gold in the cyanide solution, the gold on the surface of the gold-loaded carbon in the cyaniding system and the one in the cyanide solution have established a reversible balance condition. And when the gold-loaded carbon desorbs, the similar balance condition also happens on it. When CN ¯ or OH ¯ is added to the desorption system, because these anions are more likely to be adsorbed by active carbon, and then they will replace the adsorbed Au(CN)2¯ out, the reversible balance for gold adsorption is destroyed, and forwards to the direction against gold adsorption. 

Desorption Mechanism for Gold

It can be regarded that desorption gold from coals is essentially as far as possible to destroy the balance of the active carbon adsorption, making the process to go against the direction of the adsorption gold. Thus increasing cyanide concentration, temperature, pressure or adding organic solvent all can help desorbing gold from the activated carbon.

However, increasing the cyanide concentration, the alkalinity and adding organic solvent will boost the production cost while increasing the temperature and pressure is more economic and remarkable.

When the pressure is increased to 0.5 MPa, the temperature can be up to 150 °C and the gold desorption speed under this circumstance is faster several times than that under ordinary pressure.