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基于异步絮凝调控下微细粒赤铁矿/石英浮选分离试验研究

Research on Flotation Separation of Fine-grained Hematite/Quartz Based on Asynchronous Agglomeration Regulation
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摘要 为解决微细粒矿物在浮选过程中机械夹带和浮选效率较低等问题,在赤铁矿与石英浮选分离过程中引入了异步絮凝,即通过淀粉和PEO不同步地分别定向絮凝微细粒赤铁矿和石英,形成表观粒径适宜的赤铁矿絮团和石英絮团,通过浮选试验、沉降试验、扫描电子显微镜(SEM)及Zeta电位等方法,对赤铁矿和石英体系异步絮凝浮选的行为及机理进行了研究。结果表明,以十二烷基溴化铵为捕收剂进行异步絮凝后浮选可以提高赤铁矿和石英分离效率,即淀粉和PEO先后加入选择性絮凝赤铁矿和石英,当PEO用量为40 g/t时浮选效果最好,铁精矿品位和回收率可以达到62.13%和93.16%。PEO可以絮凝石英,促进阳离子捕收剂的浮选,提高石英浮选回收率,从而降低其对赤铁矿精矿的夹带,可以提高赤铁矿精矿的品位和回收率。 To address issues such as mechanical entrainment of fine mineral particles and low flotation efficiency in the flotation separation process of hematite and quartz,asynchronous flocculation was introduced.This involved selectively flocculating fine hematite and quartz particles in a staggered manner using starch and PEO to form appropriately sized hematite and quartz flocs.The behavior and mechanism of asynchronous flocculation flotation in the hematite and quartz system were investigated through flotation tests,sedimentation tests,scanning electron microscopy(SEM),and Zeta potential measurements.The results showed that asynchronous flocculation followed by flotation using dodecyl trimethyl ammonium bromide as a collector could enhance the separation efficiency of hematite and quartz.Specifically,selective flocculation of hematite and quartz was achieved by sequentially adding starch and PEO,with the best flotation performance observed at a PEO dosage of 40 g/t,resulting in hematite concentrate grades and recovery rates of 62.13% and 93.16%,respectively.PEO was found to flocculate quartz,promote the flotation of cationic collectors,increase quartz flotation recovery,reduce entrainment of quartz in hematite concentrates,and consequently improve the grade and recovery of hematite concentrates.
作者 张晋霞 刘飞 牛福生 陈雨盈 ZHANG Jinxia;LIU Fei;NIU Fusheng;CHEN Yuying(College of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China)
出处 《有色金属工程》 CAS 北大核心 2024年第9期116-122,共7页 Nonferrous Metals Engineering
基金 国家自然科学基金资助项目(52374265) 中央引导地方科技发展资金项目(236Z4106G) 河北省自然科学基金资助项目(E2022209108)。
关键词 微细粒 石英 赤铁矿 选择性絮凝 浮选分离 fine particles quartz hematite selective flocculation flotation separation
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