东鞍山含碳酸盐磁选混合精矿分步与分散浮选协同工艺研究

摘要

东鞍山磁选混合精矿主要有用矿物为赤铁矿以及少量的菱铁矿和磁铁矿,脉石矿物主要为石英,铁矿物多呈细颗粒存在,铁在-37 μm粒级分布率达到82.55％.为实现东鞍山含碳酸盐磁选混合精矿中铁矿物的有效分选,采用分步与分散协同浮选工艺进行试验.结果表明:以柠檬酸为分散剂、淀粉为抑制剂、KS-Ⅲ为捕收剂经菱铁矿1次正浮选,正浮选尾矿以NaOH为pH调整剂、淀粉为抑制剂、CaO为活化剂、KS-Ⅲ为捕收剂经1粗1精2扫赤铁矿反浮选闭路试验,获得了铁品位为67.89％、回收率为69.35％的铁精矿.分步与分散协同浮选通过将分步浮选工艺和分散浮选技术结合起来形成协同作用而对含碳酸盐难选铁矿石产生了较好的分选效果.%Main valuable mineral of carbonate-containing mixed magnetic separation concentrate from Donganshan is hematite,few siderite and magnetite,gangue minerals are mainly quartz,iron ore is fine desiminated,iron distribution rate in 37 μm accounted for 82.55％.For the effective separation of carbonate-containing mixed magnetic separation concentrate from Donganshan,synergetic flotation of step-by-step flotation and dispersing flotation technology was conducted.Results show that using citric acid as dispersant,starch as inhibitor,KS-Ⅲ as collector,via one step siderite direct flotation,tailings of direct flo-tation with NaOH as pH regulator,starch as inhibitor,CaO as activator,KS-Ⅲ as collector via one roughing-one cleaning-two scavenging hematite reverse flotation closed-circuit process,iron concentrate with iron grade of 67.89％,iron recovery of 69.35％ was obtained.Synergetic flotation of step-by-step flotation and dispersing flotation technology has good separation effect on carbonate-containing mixed magnetic separation concentrate for combination of the step-by-step flotation and dispersing flotation.