Perspective on pH adjustment in hydrometallurgical recycling of valuable metals from waste

Frontiers in Chemistry

Chemistry

Zhu Suiyi¹  Wang Jian²  Huang Yuhong³  Liu Jiancong⁴  Zhang Yuxin⁵  Qin Jiabao⁵  Wang Ying⁶  Yao Jinlu⁷  Ji Meichun⁷ 

[1] Colleage of Resource and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou, China;Electric Power Research Institute, State Grid Jilin Electric Power Co., Ltd., Changchun, China;Guangxi Shenglong Metallurgical Co., Ltd., Fangchenggang, China;Lversheng (Chongqing) Environmental Technology Co., Ltd., Chongqing, China;School of Environment, Northeast Normal University, Changchun, China;School of Environment, Tsinghua University, Beijing, China;Taizhou-Shenghe Water Treatment Equipment Manufacturing Co., Ltd., Taizhou, China;

关键词: pH adjustment;    hydrometallurgy;    value-added metals;    waste recycling;    leachate;   

DOI  :  10.3389/fchem.2023.1177173

 received in 2023-03-01, accepted in 2023-05-03,  发布年份 2023

来源: Frontiers

【 摘 要 】

pH adjustment was considered a simple step in the hydrometallurgy process, but its complicated operation was ignored in the past. In some industrial applications, the leachate pH was slowly adjusted by a diluted alkaline solution, with the defects of doubling the leachate volume and causing droplet hydrolysis/coagulation. Up to date, promising routes have been developed for rapid pH adjustment, especially in sealed high-temperature/pressure vessels. New routes emerged in some redox/decomposition reactions of nitrate/urea and organics. Such reactions did not start and/or were slow at room temperature but started spontaneously at high temperatures to generate/consume free H+. This induced pH adjustment in a rapid and homogeneous way.

【 授权许可】

Unknown   
Copyright © 2023 Suiyi, Jian, Yuhong, Ying, Yuxin, Jiabao, Jiancong, Jinlu and Meichun.