研山铁矿综合尾矿再选试验及生产实践  

Re-concentration Experiments and Production Practice of Comprehensive Tailings in Yanshan Iron Mine

作　　者：周咏 田艳红 Zhou Yong;Tian Yanhong(Hebei Iron and Steel Group Sijiaying Yanshan Iron Mine Co.,Ltd.,Luanxian 063700,China)

机构地区：[1]河北钢铁集团司家营研山铁矿有限公司,河北滦县063700

出　　处：《金属矿山》2019年第5期188-191,共4页Metal Mine

摘　　要：研山铁矿综合尾矿铁品位为9.14%,磁性铁分布率为20.13%、赤褐铁分布率为55.91%,铁矿物主要富集在微细粒级,其次是粗粒级。为充分利用选矿厂闲置的原反浮选尾矿选铁系统回收综合尾矿中的铁矿物,进行了选矿试验。结果表明,试样经强磁选预富集—磨矿—弱磁选—1粗1精1扫反浮选流程处理,在高梯度强磁选背景磁感应强度为0.72 T,磨矿细度为-74μm占90%,弱磁选磁场强度为238 kA/m,反浮选粗选pH调整剂NaOH用量为1 300 g/t(pH=11.5)、抑制剂苛化淀粉用量为840 g/t、活化剂CaO用量为687.5 g/t、捕收剂GK68用量为1 800 g/t,精选GK68用量为900 g/t情况下,可获得铁品位为69.84%、回收率为4.13%的优质铁精矿。改造后的生产实践表明,采用盘式磁选回收机预富集—一段闭路磨矿—浓缩磁选—二段闭路磨矿—弱磁选抛尾—1粗1精3扫闭路反浮选流程处理选矿厂综合尾矿,每年可产出铁品位超过69%的铁精粉约5.5万t,可为企业增加利润1 750万元/a。The iron grade of the comprehensive iron tailings in Yanshan mine is 9.14%,in which the ratio of magnetic iron ore is 20.13% and the ratio of hematite and limonite is 55.91%.The iron ore is mainly enriched in micro-size fraction,followed by coarse fraction.The original iron reverse-flotation idle system was adopted to recover the iron from the comprehensive tailings.The results showed that under the conditions of induced magnetic field intensity of 0.72 T in high magnetic separation,grinding fineness with -74 μm 90%,magnetic field intensity of 238 kA/m in low intensity magnetic separation, NaOH as pH regulator of 1 300 g/t(pH=11.5),caustic starch as inhibitor of 840 g/t,CaO as activator of 687.5 g/t and GK68 as collector of 1800 g/t in roughing separation(900 g/t in cleaning separation),a high-quality iron concentrate with grade of 69.84% and recovery rate of 4.13% was obtained by the process of pre- concentration in the high intensity magnetic separation,grinding,low intensity magnetic separation and reverse flotation of one roughing-one cleaning-one scavenging.The improved production practices showed that by adopting the process of pre-concentration by the disk magnetic separator,stageone closed-circuit grinding,concentrated magnetic separation,stage-two closed-circuit grinding,low intensity magnetic separation and closed circuit flotation of containing one roughing- one cleaning- three scavenging to treat the combined tailings, about 55,000 tons of iron concentrate of over 69% grade can be output annually,with annual profit of 17.50 million Yuan gained.

关 键 词：综合尾矿 闲置系统 强磁选 弱磁选 反浮选 

分 类 号：TD924.1[矿业工程—选矿] TD923.7