摘要
为强化微细粒铁尾矿的选择性絮凝分选,研究了不同条件下矿物颗粒的分散行为及机理。以低品位、细粒度且主要矿物为赤铁矿和石英的铁尾矿为对象,采用单因素法考察了搅拌速度、搅拌时间、分散剂用量对其分散行为的影响。结果表明,加快搅拌速度、延长搅拌时间、添加分散剂均有助于矿浆的分散,与其他几组分散剂相比,硅酸钠+硫酸铵组合分散剂的分散效果最好,且用量最低。此外,还考察了硅酸钠+硫酸铵对赤铁矿、石英单矿物表面电位的影响,并从溶液化学、EDLVO理论的角度进行了分析。结果发现,硅酸钠水解的SiO(OH)_(3)^(-)吸附在矿物表面,增加了矿物颗粒间的静电排斥力和空间位阻排斥力,而且,与之组合使用的硫酸铵不仅可以增加SiO(OH)_(3)^(-)的含量,本身对矿泥也有一定的分散作用,将二者组合使用,能产生正协同的分散效果,使分散体系更加稳定。
To strengthen the selective flocculation separation of micro-fine particle iron tailings,the dispersion behavior and mechanism of mineral particles under different conditions were studied.The effects of stirring speed,stirring time and dispersant dosage on the dispersion behavior of low-grade,micro-fine particle iron tailings with hematite and quartz as the main mineral components were investigated by single factor method.The results show that speeding up the stirring speed,prolonging the mixing time and adding dispersant are helpful to the dispersion of pulp.Compared with the other two groups of dispersants,sodium silicate and ammonium sulfate combined reagent has the best dispersing effect,and the optimal dosage is the lowest.In addition,the effect of sodium silicate and ammonium sulfate on the surface potential of hematite and quartz was investigated,and the dispersion mechanism was analyzed from the perspective of solution chemistry and EDLVO theory.It is found that SiO(OH)_(3)^(-) hydrolyzed by sodium silicate is adsorbed on the mineral surface,which increases the electrostatic repulsion force and steric repulsion force between mineral particles.In addition,ammonium sulfate combined with sodium silicate can not only increase the content of SiO(OH)_(3)^(-) but also disperse the slime.The combination of this two reagents has a positive synergistic dispersion effect,which makes the dispersion system more stable.
作者
陈子杨
蒋京航
叶国华
陶媛媛
唐悦
胡渝杰
CHEN Zi-yang;JIANG Jing-hang;YE Guo-hua;TAO Yuan-yuan;TANG Yue;HU Yu-jie(Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China;State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming 650093,China)
出处
《矿冶》
CAS
2021年第3期69-76,共8页
Mining And Metallurgy
基金
国家自然科学基金资助项目(51964028,51764024)。
关键词
铁尾矿
分散
赤铁矿
石英
ZETA电位
iron tailings
dispersion
hematite
quartz
Zeta potential
