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中南大学学报(英文版)

Journal of Central South University

Vol. 13    No. 6    December 2006

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Removal of phosphorus from iron ores by chemical leaching
JIN Yong-shi(金勇士),JIANG Tao(姜涛),YANG Yong-bin(杨永斌),LI Qian(李骞),
LI Guang-hui(李光辉),GUO Yu-feng(郭宇峰)

School of Minerals Processing and Bioengineering,Central South University,
Changsha 410083,China

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.

 

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

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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