期刊
CHEMISTRY AFRICA-A JOURNAL OF THE TUNISIAN CHEMICAL SOCIETY
卷 2, 期 3, 页码 415-422出版社
SPRINGERNATURE
DOI: 10.1007/s42250-019-00048-z
关键词
Phosphogypsum; Conversion; Calcium carbonate; Leaching; Rare earth elements
资金
- Ministry of Higher Education and Scientific Research of Tunisia
Phosphogypsum (PG) is classified as the main hazardous waste present in large quantities in Tunisia. It is a by-product of the fertilizer industry produced by a sulfuric acid attack on calcium phosphate. Storage and management of this toxic waste are environmental problems that concern many countries producing phosphate fertilizer, especially since waste is, in principle, prohibited by international law. Therefore, finding out a solution for the valorization or the removal of phosphogypsum has become a universal preoccupation and a topical research field. In this work, a fresh produced PG sample was firstly characterized by various analytical methods to determine its chemical composition as well as its rare earth elements (REEs) amount. Then, a hydrothermal conversion of the PG allowed obtaining an insoluble residue of calcium carbonate richer in REEs than the starting sample such that the enrichment rate was 66%. The obtained residue, considered after that as an interesting source of rare earths, was leached with a hydrochloric solution (5-6%) in the presence of ascorbic acid as reducing agent. The leaching method favored the migration of 89% of REEs to the leach liquor.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据