四川某赤铁矿石选矿试验

Beneficiation Experiment of a Hematite Ore from Sichuan Province

四川某铁矿石属低硫磷高硅铝酸性弱磁性铁矿石，铁主要以赤铁矿的形式存在。为了给该赤铁矿石的开发利用提供依据，采用粗粒强磁干选一细粒高梯度强磁选一中矿再浮选工艺对其进行了选矿试验。结果表明：原矿破碎、筛分成40—15mm和-15mm两部分后，40～15mm粒级经YCG-350×1000永磁辊式粗粒强磁选机干选，可获得产率为20．42％、铁品位为52．67％、铁回收率为22．47％的的合格块精矿；-15mm粒级和干选尾矿磨至-0．074mm占85％后经SLon高梯度强磁选机1次粗选、1次精选、1次扫选，可获得铁品位为60．35％、铁回收率为32．46％的高梯度强磁选铁精矿；高梯度强磁选中矿经脂肪酸类捕收剂NZ1粗2精正浮选，又能获得铁品位为60．39％、铁回收率为13．11％的浮选铁精矿，从而使综合铁回收率达到68．04％。

An iron ore from Sichuan province belongs to an acid,low-magnetic iron ore with low sulfur and phosphorus, high silicon and aluminium, and iron mainly exists in the form of hematite. In order to provide a basis for developing and utili- zing the ore, beneficiation tests were carried out through the process of dry high intensity magnetic separation for coarse parti- cles-high gradient high intensity magnetic separation for fine particles-middlings back into flotation process. The results showed that after crushing and screening,the ore was divided into two sections, namely 40 - 15 mm and - 15 mm. Iron concentrate with yield of 20. 42% ,iron grade of 52. 67% ,iron recovery of 22. 47% was obtained for dealing with 40 ~ 15 mm ores through dry high intensity magnetic separation by YCG-350 x 1000 permanent magnetic roUer separator; Iron concentrate with iron grade of 60. 35%, iron recovery of 32.46% was obtained for dealing with -15 mm fraction and tailings from dry separation through grinding at 85% passing 0. 074 mm through the process of one roughing, one cleaning, one scavenging with SLon high gradient magnetic separator; Iron concentrate with iron grade of 60. 39% and iron recovery of 13.11% was received by dealing with middlings of high gradient magnetic separation through the process of one roughing, two cleaning direct flotation, with fatty acid NZ as collector,which makes comprehensive iron recovery rate reach 68.04%.