Stuy On Treatment And Recovery Of The Waste Gold Liquor Using Bio-oxidation Extracting Valuable Elements Iron

Along with the rapid development of gold industries, the easy-processed ores are in danger. The development and utilization of the refractory gold ores, which have reached more than30%of the total gold ores in China, are important and urgent task of our gold sector. The biological oxidation technology for extracting gold is a efficient process of developing and utilizing refractory gold ores, but there is a great deal of acidic waste liquor containing arsenic in the process. For now, the waste liquor containing arsenic is mainly treated by lime-iron salt technology at home and abroad, to make arsenic form FeAsO4precipitates in the waste liquor to eliminate.This kind of arsenic and iron slag is usually treated by buried processing which exists not only the secondary pollution but also the waste of valuable elements.Therefore, it is of significance to investigate the harmless and resourceful treatment technology of acidic biological oxidation liquor containing arsenic on both theory and practice.The ferric iron(Fe3+) was recycled in the form of ferric phosphate by selective precipitation method using (NH4)2HPO4as the precipitant in this paper, and the influences of technological parameters like temperature, stirring rate, pH on iron recovery and arsenic-iron separation efficiency were investigated. The optimum process conditions, temperature45℃, stirring rate500rpm and pH2.5, were obtained by three factorial orthogonal experiments based on single-factor experiment. Under the conditions, the iron recovery was99.83%and the arsenic retention rate was98.64%in liquid phase to realize the recovery of valuable element effective separation of arsenic and iron. In this paper, the dehydration of the products obtained by selective precipitation in roasting was studied, and the influences of roasting temperature and time on ferric phosphate form were observed. In addition, the preparation technique of LiFePO4/C composite materials were researched with FePO4gained by the experiment as raw material, and the effects of technological parameters like roasting...