Removal of phosphorus from iron ores by chemical leaching

来源期刊：中南大学学报(英文版)2006年第6期

论文作者：金勇士 姜涛 杨永斌 李骞 李光辉 郭宇峰

文章页码：673 - 677

Key words：iron ore;dephosphorization;acid-leaching;alkali-leaching

Abstract: Alkali-leaching and acid-leaching were proposed for the dephosphorization of Changde iron ore,which contains an average of 1.12%for phosphorus content.Sodium hydroxide,sulfuriced,hydrochloric and nitric acids were used for the preparation of leach solutions.The results show that phosphorus occurring as apatite phase could be removed by alkali-leaching,but those occurring in the iron phase could not.Sulfuric acid is the most effective among the three kinds of acid.91.61%phosphorus removal was attained with 1%sulfuric acid after leaching for 20 min at room temperature.Iron loss during acid-leaching can be negligible,which was less than 0.25%.The pH value of solution after leaching with 1%sulfuric acid was about 0.86,which means acid would not be exhausted during the process and it could be recycled,and the recycle of sulfuric acid solution would make the dephosphorization process more economical.