Purification of specularite by centrifugation instead of flotation to produce iron oxide red pigment

• 作者: Qiang Guo Shun-wei Zhu Tao Qi Xi Zhang Yong-li Li Yu-jiang Li
• 来源期刊: 矿物冶金与材料学报
• 年，卷（期）: 2021,（1）
• 页码范围: 56-65
• 页数: 10页
• 语种: 英文

摘要

This study used specularite,a high-gradient magnetic separation concentrate,as a raw material in reverse flotation.An iron concen-trate with a grade of 65.1wt％and a recovery rate of 75.31％were obtained.A centrifugal concentrator served as the deep purification equip-ment for the preparation of iron oxide red pigments,and its optimal rotating drum speed,feed concentration,and other conditions were determ-ined.Under optimal conditions,a high-purity iron oxide concentrate with a grade of 69.38wt％and a recovery rate of 80.89％were obtained and used as a raw material for preparing iron oxide red pigment.Calcining with sulfuric acid produced iron red pigments with different hues.Simultaneously,middlings with a grade of 60.20wt％and a recovery rate of 17.51％were obtained and could be used in blast furnace ironmak-ing.High-value utilization of specularite beneficiation products was thus achieved.