摘要
-10μm白钨矿的浮选回收率低,导致大量白钨矿损失于尾矿中,造成资源浪费,而载体浮选是提高-10μm白钨矿回收率的有效方法之一.根据粒级以及粒级组成对白钨矿浮选的影响,通过浮选试验、理论计算和仪器检测等方法研究了-10μm细粒级白钨矿的自载体浮选,同时研究了载体比例、载体含量和碳酸钠对白钨矿自载体浮选的影响.研究结果表明,油酸钠为捕收剂时,在合适的载体粒度和载体比例下,自载体浮选是提高-10μm白钨矿回收率的有效方法,碳酸钠可强化白钨矿的自载体浮选,扩大载体比例和载体粒度范围.机理研究表明,白钨矿颗粒间存在引力,使-10μm细粒级白钨矿黏附于载体颗粒上,且疏水性作用是白钨矿发生团聚的主要原因.加入碳酸钠后有利于促进油酸钠在白钨矿表面的吸附,增加颗粒间的疏水力,进而可提高白钨矿的自载体浮选效果.
Because of the low recovery of-10 μm fine scheelite particles in scheelite flotation,some amount of fine scheelite is lost in the tailing,resulting in the wasting of scheelite resources. It is urgently needed to solve the problems inherent in fine scheelite flotation and explore new processes of fine ores to effectively recover fine scheelite. The carrier flotation has proven to be an effective method of improving the recovery of scheelite by promoting the recovery of fine particles. Based on studies of the effect of particle size and particle fraction on scheelite flotation,the application of auto-carrier flotation in the recovery of-10 μm scheelite using sodium carbonate in both the presence and absence of sodium carbonate were studied. The effect of percentage carrier,particle size of carrier,and sodium carbonate on the auto-carrier flotation of scheelite were also studied through flotation tests,theoretical calculation,and instrument testing. The results indicate that the contents and particle size of coarse particles exert significant influence on auto-carrier flotation. The recovery of fine scheelite with a size of-10 μm is increased by using auto-carrier flotation with the proper carrier percentage and size. The addition of sodium carbonate strengthens the carrier flotation of scheelite and therefore improves the scheelite recovery. Furthermore,the addition of sodium carbonate can also expand the percentage and particle size range of carrier mineral. The results of mechanism studies indicate that there exists interaction among scheelite particles,which results in the adhesion of fine particle to carrier. The hydrophobic force is the main reason that the scheelite particles attracted each other,and the addition of sodium carbonateincreases the adsorption of sodium oleate onto the scheelite surface,thereby improving the hydrophobicity of scheelite and the hydrophobic force among scheelite particles. It can be concluded that the auto-carrier flotation of scheelite can be improved by adding sodium carbonate.
作者
王纪镇
印万忠
孙忠梅
WANG Ji-zhen;YIN Wan-zhong;SUN Zhong-mei(College of Chemistry and Chemical Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;State Key Laboratory of Comprehensive Utilization of Low Grade Refractory Gold Ores,Shanghang 364200,China)
出处
《工程科学学报》
EI
CSCD
北大核心
2019年第2期174-180,共7页
Chinese Journal of Engineering
基金
国家自然科学基金资助项目(51374079)
陕西省自然科学基础研究计划资助项目(2017JQ5090)
西安科技大学校级培育基金资助项目(201624)
西安科技大学博士启动金资助项目(2015QDJ068)
关键词
细粒白钨矿
自载体浮选
碳酸钠
油酸钠
疏水力
fine scheelite particles
auto-carrier flotation
sodium carbonate
sodium oleate
hydrophobic force
作者简介
通信作者:王纪镇,E-mail:jizhenwang126@126.com.
