论文部分内容阅读
苏联南方采选公司最初制定的氧化铁矿石强磁场磁选工艺包括两段磨矿和两段磁选。第一段磁选分出最终尾矿,而中矿再磨后送入第二段磁选,获得精矿和尾矿。第二段磁选的中矿是返回矿量,同第一段磁选的中矿合併送去浓密。因此,进行浓密的产品,其磁性是不均匀的。最终精矿和第二段磁选中矿的比磁化系数相差5～5.5倍。因此,第二段磁选的选别效率低,而且中矿返矿量显著增加(达210～270％)及尾矿中铁的含量高达25～27％;精矿中铁的回收率降低到68～69％。铁回收率不高的主要原因之一是细粒级别(—20微米)选别效率极低造成的。大量的细泥进入尾矿中,其中铁的含量接近于原旷(29～31％)。为此深入地研究提高磁选效率的途经,其中包括磁选前细粒的优先分选,矿浆泥、砂分选和按照每个选别段中所分离产品的矿物单体解离度及磁性阶段分选出精矿和尾矿。研究试样是采自南方采选公司矿床Ⅳ和Ⅴ含铁矿层的氧化铁矿石。
The magnetic iron oxide magnetic field magnetic separation process originally developed by Southern Mining and Mining Company of the South Sudan consists of two stages of grinding and two stages of magnetic separation. The first paragraph of the magnetic separation of the final tailings, and mine after grinding into the second paragraph of magnetic separation, obtained concentrate and tailings. The second paragraph of magnetic separation in the mine is to return the amount of ore, with the first paragraph of the magnetic separation of ore combined to send thick. Therefore, the dense product, the magnetic is not uniform. The difference between the final magnetization and the magnetization coefficient of the second stage magnetic separation ore is 5 to 5.5 times. Therefore, the second stage magnetic separation efficiency is low, and the amount of ore re-mining increased significantly (up to 210 ~ 270%) and tailings iron content as high as 25 ~ 27%; concentrate iron recovery rate reduced to 68 ~ 69%. One of the major reasons for the poor iron recovery is the very low efficiency of the fines fraction (-20 microns). A large number of fine mud into the tailings, in which iron content close to the original Kuang (29 ~ 31%). In order to do this, the ways to improve the efficiency of magnetic separation are studied in depth, including the preferential selection of pre-magnetic separation granules, the separation of slurry and sand, and the dissociation degree and the magnetic property of the minerals in the separated products in each sorting section Stage sorting out the concentrate and tailings. The study sample is an iron oxide ore taken from the iron ore layers IV and V of the South Mining Company Deposit.