PDF《蛇纹石与滑石的同步抑制原理》

第?22?卷第?2?期 中国有色金属学报? 2012?年?2?月? Vol.

22?No.2? The?Chinese?Journal?of?Nonferrous?Metals? Feb.?2012? 文章编号:1004?0609(2012)02?0560?06? 蛇纹石与滑石的同步抑制原理 卢毅屏,张明洋,冯其明,欧乐明,张国范? (中南大学 资源加工与生物工程学院,长沙? 410083)? 摘要:通过浮选试验、沉降实验、Zeta 电位测试和吸附量测试,研究以六偏磷酸钠和古尔胶为调整剂时,蛇纹 石和滑石的同步抑制及其机理.结果表明:在较宽?pH?范围内,蛇纹石与滑石颗粒表面电性相反,易发生异相凝 聚,使得硫化矿浮选的降镁难度增大;

六偏磷酸钠和古尔胶的组合使用能较好地同步抑制蛇纹石和滑石,实现与 黄铁矿的人工混合矿分离;

六偏磷酸钠使得蛇纹石颗粒表面动电位由正变负,蛇纹石与滑石颗粒间分散,从而提 高古尔胶在滑石表面的吸附量.研究并提出对蛇纹石和滑石的混合镁硅酸盐矿物应是首先消除颗粒间的异相凝 聚,再抑制易浮矿物的同步抑制原理. 关键词:蛇纹石;

滑石;

分散;

抑制 中图分类号:TD91? 文献标志码:A? Sync?suppression?principle?of?serpentine?and?talc? LU?Yi?ping,?ZHANG?Ming?yang,?FENG?Qi?ming,?OU?Le?ming,?ZHANG?Guo?fan? (School?of?Minerals?Processing?and?Bioengineering,?Central?South?University,?Changsha?410083,?China)? Abstract:? Using? sodium? hexametaphosphate? and? guar? gum? as? regulators,? the? sync? suppression? and? mechanism? of? serpentine? and? talc? were? studied? by? flotation? tests,? sedimentation? tests,? Zeta? potential? measurements? and? adsorption? measurements.?The?results?show?that?the?surface?potential?of?serpentine?and?talc?particles?is?contrast?in?a?wide?pH?range,? leading?to?heteroaggregation?between?the?serpentine?and?talc?particles,?which?makes?lowing?magnesium?in?sulfide?ore? flotation?process?difficult.?The?serpentine?and?talc?is?sync?suppressed?and?separated?from?the?artificial?mixed?mineral?of? pyrite? with? sodium? hexametaphosphate? and? guar? gum.? Sodium? hexametaphosphate? makes? the? surface? potential? of? serpentine? particles? from? the? positive? into? negative,? which? results? in? serpentine? and? talc? particles? dispersing?and? the? adsorption?of?guar?gum?on?talc?surface?increasing.?The?sync?suppression?principle?is?that?heteroaggregation?between?the? serpentine?and?talc?particles?should?be?eliminated?firstly,?then depress?the easy?floating?minerals.? Key?words: serpentine??talc? dispersion??suppression? 在金川硫化铜镍矿浮选中,降低精矿中氧化镁的 含量始终是选矿的技术目标和难题.随着难处理、低 品位矿石的逐渐开发利用,铜镍硫化矿与含镁硅酸盐 的分离问题更加突出? [1?4]? . 由于金川硫化铜镍矿含矿岩 体为铁质超基性岩,在不同程度的蚀变作用下,含矿 岩体蛇纹石化、绿泥石化或滑石?碳酸盐化,使得脉 石矿物以蛇纹石为主,有蛇纹石、滑石、绿泥石、橄 榄石、辉石等多种存在形式.对于难选贫矿,其中镁 硅酸盐的组成复杂,往往是蛇纹石、绿泥石、滑石等 多种矿物共存? [5?6]? ,更使得降镁难度增大. 蛇纹石和滑石是两种表面性质和浮选行为差异很 大的镁硅酸盐矿物,因此,其与硫化矿物分离的方案 大不相同.大量研究表明,对蛇纹石型硫化镍矿石, 主要是通过分散蛇纹石,减少泡沫夹杂并防止其在有 基金项目:国家重点基础研究发展计划资助项目(2007CB613602)? 收稿日期:2011?01?14;

修订日期:2011?03?20? 通信作者:卢毅屏,副教授,博士;