Current Efficiency Increase in Zinc Electrodeposition …
107
Solution from Dam #6
MnO2 Filtration
Zinc Concentrate
Zinc Calcine
Residue from
Reduction Step
Pb/Ag Resídue
Cu/Cd Cement
MnO2 in the cathode
Goethite Residue
Co Cement
Efluent from Electroysis
MnO2 Filtration
Spent to Dam
pH 7.0
pH 9.0
LEACHING
PURIFICATION
ELECTROLYSIS
Fig. 2 Diagram of income and exits of manganese in Cajamarquilla
manganese in the anode sludge that is sent to the hot acid leaching stage dissolves
and returns to the system.
In Fig. 3, we can see how the concentration of manganese in the Cajamarquilla
Refinery has behaved.
To achieve this reduction of manganese in the electrolyte of solution to tailing
dam N° 6, this dam is destined to receive the goethite residue which is generated in
leaching stage of iron purification process, taking into account that the solutions of
this dam will be returned to the plant through the pH 7 stage where 99% of the zinc
is precipitated as hydroxide and only 50% of the manganese becoming a manganese
purge of the system without impacting the recovery of global zinc. The sludge from
this stage known as pH-7 is then used in the goethite stage to neutralize the formation
of H
+ ions during precipitation of the Fe
3+ ion in the form of goethite.
This purge was carried out in three stages as can be seen in Fig. 4, the first stage in
September 2017 purging 10,000 m
3 of electrolyte, in November 2017 an additional
Fig. 3 Historical
concentration of manganese
in Cajamarquilla
107
Solution from Dam #6
MnO2 Filtration
Zinc Concentrate
Zinc Calcine
Residue from
Reduction Step
Pb/Ag Resídue
Cu/Cd Cement
MnO2 in the cathode
Goethite Residue
Co Cement
Efluent from Electroysis
MnO2 Filtration
Spent to Dam
pH 7.0
pH 9.0
LEACHING
PURIFICATION
ELECTROLYSIS
Fig. 2 Diagram of income and exits of manganese in Cajamarquilla
manganese in the anode sludge that is sent to the hot acid leaching stage dissolves
and returns to the system.
In Fig. 3, we can see how the concentration of manganese in the Cajamarquilla
Refinery has behaved.
To achieve this reduction of manganese in the electrolyte of solution to tailing
dam N° 6, this dam is destined to receive the goethite residue which is generated in
leaching stage of iron purification process, taking into account that the solutions of
this dam will be returned to the plant through the pH 7 stage where 99% of the zinc
is precipitated as hydroxide and only 50% of the manganese becoming a manganese
purge of the system without impacting the recovery of global zinc. The sludge from
this stage known as pH-7 is then used in the goethite stage to neutralize the formation
of H
+ ions during precipitation of the Fe
3+ ion in the form of goethite.
This purge was carried out in three stages as can be seen in Fig. 4, the first stage in
September 2017 purging 10,000 m
3 of electrolyte, in November 2017 an additional
Fig. 3 Historical
concentration of manganese
in Cajamarquilla