Study on Purification and Removal of Iron from Alloy Anode

Abstract

Residue of alloy anode generated in three-layer liquid electrolytic purifying method is refined, the state of iron in raw materials is analysed. The state (morphology) changes of iron refined by different refining agent are investigated. Results show: 40% of boron salts or phosphate as the main component of refining agent adding 15% NaCl、20% KCl、15% CaF2、5% NaF、5% cryolite, melting the residue of alloy anode at 1100°C and 1200°C respectively, the crystal could be incubated to grow up fully, it is benefit for collecting iron. When the soaking time is 150min, iron component in alloy is 4.8%,it reaches the standard taking back into the aluminum refining process.

Impurity Behavior in Aluminum Extraction by Low-Temperature Molten Salt Electrolysis

“…Electrolytic extraction of aluminum from Al-Si alloys is one of the most promising methods. 20 The main method used at present is traditional high-temperature electrolysis with the Al-Si alloy as the soluble anode and NaCl-KCl-AlF 3 (Na 3 AlF 6 ) as the electrolyte system. The electrolysis temperature is 690 °C-720 °C, and energy consumption during electrolysis is high.…”