Study on ultrasonic leaching and recovery of fluoride from spent cathode carbon of aluminum electrolysis

Abstract

Under the assistance of ultrasound, the fluoride in the spent cathode carbon of aluminum electrolysis was recovered by the process of washing first and then leaching.

Study on the effect of an ultrasound assisted reaction on the crystallization properties of recovered cryolite

“…16 However, these methods generate a large amount of high concentration uoride wastewater during the treatment process, which has become a thorny problem. 17,18 The common treatment methods for uoride containing wastewater include chemical precipitation method, 19 coagulation precipitation method, 20 crystallization precipitation method, 21 adsorption method, 22 ion exchange method, 23 etc. Some methods have problems such as complex equipment, large operating capacity, high energy consumption, and high treatment cost in the treatment process, making it difficult to be widely applied.…”

“…This conclusion has been previously studied by the team. 17 Therefore, strong acid and alkali environments are not conducive to the formation of cryolite. The removal effect of uoride ions is best in pH 8.7, and the highest uoride ion removal efficiency is 95.5% when ultrasonic assisted.…”