矿产保护与利用2024，Vol.44Issue(6)：129-138,10.DOI:10.13779/j.cnki.issn1001-0076.2024.08.008
磷石膏浮选—酸浸耦合除杂增白工艺研究
Study on the Process of Phosphogypsum Floatation Coupled with Acid Leaching for Impurity Removal and Whitening
摘要
Abstract
Phosphogypsum,a bulk solid waste generated from the wet phosphoric acid process,is primarily disposed of through centralized stockpiling,which poses significant environmental risks.This study investigates the flotation and acid leaching conditions for phosphogypsum sourced from a phosphate fertilizer producer in Hubei,China.Optimal results were achieved under the following conditions:dodecylamine dosage of 200 g/t,slurry pH of 2.0,sulfuric acid concentration of 5%,liquid-solid ratio of 5:1,leaching time of 2 hours,and temperature of 35℃.The treated phosphogypsum exhibited a whiteness of over 70%,a CaSO4·2H2O purity exceeding 97%,and reduced soluble phosphorus and fluorine contents to 0.098%and 0.052%,respectively.FT-IR spectra,zeta potential,and surface tension analyses revealed that dodecylamine interacts with phosphogypsum surfaces through hydrogen bonding and physical adsorption.Additionally,the flotation process significantly decreased the silicon dioxide content in the concentrate.This method demonstrates simplicity,strong applicability,and potential to provide high-quality raw materials for the value-added utilization of phosphogypsum.关键词
磷石膏/浮选/十二胺/酸洗/耦合工艺/白度Key words
phosphogypsum/flotation/dodecylamine/acid leaching/coupling process/whiteness分类
矿山工程引用本文复制引用
郭万鑫,董万强,邓祥意,池汝安,陈卓,孙宁杰..磷石膏浮选—酸浸耦合除杂增白工艺研究[J].矿产保护与利用,2024,44(6):129-138,10.基金项目
国家重点研发计划项目(2022YFC3902702) （2022YFC3902702）
湖北三峡实验室首席科学家项目(SXCS2204) （SXCS2204）
湖北三峡实验室开放/创新基金项目(SK211002) （SK211002）
