Cadmium extraction from phosphate ore. Effect of microwave

Arabian Journal of Chemistry

关键词: Cadmium;    Phosphate ore;    Extraction;    Microwave;    Environment;    Treatment;   

DOI  :  10.1016/j.arabjc.2011.05.016

来源: DOAJ

【 摘 要 】

This study discusses the operating variables for removal of cadmium from phosphate ore using Na2EDTA. These variables include the reaction time, Na2EDTA concentration, liquid/phosphate ore ratio, number of extractions and microwave extraction. Na2EDTA induced a two-step extraction process including a rapid extraction within the first hour, and a subsequent gradual release that occurred over the following hours. The cadmium extraction efficiency increased progressively with the increasing of Na2EDTA concentration. The extraction efficiency of cadmium increased with increasing liquid/phosphate ratio in the 5–200 range. Consecutive extractions using low concentrations were more effective than a single soil extraction with concentrated Na2EDTA. Microwave was beneficial to improve the removal in soil washing, and using microwave could partly substitute for agitation.

【 授权许可】

Unknown