Preparation of Zinc Oxide and Zinc Ferrite from Zinc Hypoxide by Wet Process and Electrochemistry

Abstract

With the increase of zinc resource consumption, the recovery and utilization of zinc resources in zinc suboxide has become one of the current research hotspots. In this study, the electrochemical method was used to remove the impurities in the zinc leaching night and enrich the zinc ferrite in the ammonia leaching residue for the solution and ammonia leaching slag after the ammonia leaching of zinc hypoxide, in order to realize the comprehensive utilization of the essence of zinc immersion night and new resources. The results showed that the reduction potentials of copper, lead, cadmium, and zinc in the ammonia leaching solution were analyzed by electrochemical testing methods to be −0.76 V, −0.82 V, −0.94 V, and −1.3 V, respectively. Through constant potential electrodeposition, the removal rate of copper, lead, cadmium. The removal rate of cadmium is 98.73%, and the removal rate of lead and copper is more than 99%. The purified ammonia leaching solution is evaporated at 90 °C for 25 min to obtain basic zinc carbonate. The purity of ZnO obtained after calcination at 500 °C for 120 min is 96.31%. The ammonia leaching residue was pickled with 3 mol·L−1 acetic acid for 30 min to effectively remove PbCO3, and then magnetic separation was carried out with a current intensity of 1.4 A. The final zinc ferrite content was 83.83%.

A base-free hydroxylaminolysis protocol promoted by ZnO in deep eutectic solvents

“…34 Similarly, calcination is a general method for the production of zinc oxide 35 and the recovery of metal zinc in the form of zinc oxide from zinc-containing waste. 36,37 As for the classical hydroxylaminolysis using alkali, it is difficult to compare energy consumption because of not involving reagent recovery and wastewater disposal. However, in terms of the comparison of wastewater disposal, it is easier to recover the mono-component aqueous hydroxylamine by evaporation than to treat wastewater composed of water, VOCs and inorganic salts.…”

Mineral Phase Reconstruction and Separation Behavior of Zinc and Iron from Zinc-Containing Dust

“…The current treatment of electric-furnace dust in steel companies is based on recycling, including hydro-and pyrometallurgical treatment methods [3,[6][7][8][9][10][11][12][13][14][15][16][17]. The direct recycling of zinc-containing dust in steel companies is achieved using electric-furnace dust as a raw material for the sintering processes [18][19][20].…”