国外某高硫铁矿磁浮联合选矿工艺试验研究

Experimental Study on Magnetic Flotation Combined Beneficiation Process of a High Sulfur Iron Mine Abroad

为了给开发利用国外某高硫铁矿资源提供选矿技术依据,首先对原矿进行了详细的工艺矿物学研究,在此基础上进行了选矿工艺试验,并确立了最佳的选矿工艺流程,最后对所得铁精矿的品质进行了考查。工艺矿物学研究结果表明,原矿中主要有用元素铁的含量为35.96%,且89.35%为磁性铁,主要有害元素S的含量为0.45%,主要以硫化物形式存在,占比55.56%;原矿主要回收的目的矿物磁铁矿含量为44.62%,其嵌布粒度粗细不均,以中细粒嵌布为主,-0.07 mm粒级分布率为55.58%。选矿工艺试验结果表明,原矿经磨前湿式预选—磨矿—弱磁选选铁—浮选脱硫的工艺方案,获得了产率为45.37%、铁品位为65.39%(硫含量为0.22%)、铁回收率为82.44%的铁精矿,选矿指标较佳。产品考查结果表明,铁精矿的S、P、F、K2O+Na2O的含量均满足铁精矿质量标准的要求。

In order to provide a technical basis for the development and utilization of a high sulfur iron ore resource abroad,a detailed process mineralogy study was firstly conducted on the raw ore.On this basis,beneficiation process tests were conducted and the optimal beneficiation process flow was determined.Finally,the quality of obtained iron concentrate was examined.The research results of process mineralogy are concluded as follows.The main useful element of iron content in the raw ore is 35.96%,of which 89.35%is magnetic iron.The main harmful element of S content is 0.45%,and it mainly exists in the form of sulfides,accounting for 55.56%.The main target mineral recovered from the raw ore is magnetite,with a content of 44.62%.The particle size distribution is uneven,mainly consisting of medium and fine particles,with a distribution rate of 55.58%in the-0.07mm particle size range.The results of the beneficiation process tests show that the process scheme of wet pre-magnetic separation before grinding,grinding,low intensity magnetic separation for iron,and desulfurization through flotation for the raw ore has obtained an iron concentrate with a yield of 45.37%,an iron grade of 65.39%(sulfur content of 0.22%),and an iron recovery rate of 82.44%.The beneficiation indicators are relatively good.The product inspection results show that the S,P,F,K2O+Na2O of iron concentrate all meet the quality standards of iron concentrate.