Electrolyzer for aluminum production
Novel electrolytes containing sodium cryolite, alumina, and modifying additives have been developed for aluminum production.
Modified electrolytes characteristics:
- high electrical conductivity;
- high alumina solubility and its rate of dissolution;
- possibility to perform electrolysis at high current density;
- recommended for industrial testing.
The testing results in industrial electrolyzers OM-120 at “Kraz” OJSC:
- The rate of alumina solubility in modified electrolytes is 2-3 times higher than that in conventional electrolyte of industrial bath;
- the anode effect frequency reduces in 10 times or more;
- the electrical conductivity in modified electrolytes of testing baths is 8-12 % higher than that in industrial bath;
- the bath voltage decreases on 100÷200 mV without anode-to-cathode distance change;
- AlF3 consumption is brought to stable amount of 27 kg/day, that is 17 kg/day lower than that in industrial bath.
The patent RUS2288977 dated 10.12.2006 is issued.
Advantages:
- Improvement of engineering-and-economical performance of the aluminum electrolytic production;
- Electrolyzers operating life increase;
- Environmental situation improvement at aluminum plants.
