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Interaction force measurement under electric and magnetic field at small distance and carrier separation with coagulation and dispersion

电场和磁场下近距离相互作用力测量以及混凝分散载体分离

基本信息

批准号：
08455481
负责人：
FUJITA Toyohisa
金额：
$ 4.8万
依托单位：
Akita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455481/
关键词：
Electoromagnetic field Fine particle Surface force Coagulation Carrier Flotation Magnetic separation 電界

项目摘要

This topic includes two kinds of research works. One is the development of measurement instrument of interaction force under electric field and magnetic field between conductive gold coated hemisphere and plate in solvent at small distances from 10 nm to 1mum. When applying electric field in silicone oil between hemisphere and plate, the oscillation of adhesion and repulsion was observed periodically at near the silicone oil molecule length of about 50 nm within less than 0.5 mum distance. On the other hand the interaction force of ER fluid dispersing smectite in silicone oil under electric field showed oscillation at the period of about 0.1 mum that shows a secondary coagulation diameter. The magnetic force was applied with the surrounding the hemisphere and plate. The silicone of based magnetic fluidis used as the solvent.The other research is the utilization of coagulation and dispersion between particles. The carrier flotation of ultrafine cassiterite and magnetic separation of fine wolframite were carried out. The cassiterite particle (-5mum) was investigated using coarse cassiterite and the other kinds of coarse minerals, such as cerussite, galena and quartz as canier in a sodium oleate collector system in the flotation. The fine particles recovery increased from 50% to 95%. Also the wolframite particle (-5mum) was investigated using coarse magnetite as carriers and sodium oleate as the surfactant by high gradient magnetic separator. The fine wolframite recovery improved from 50% to 90% by carrier magnetic separation at 0.27T.

本课题包括两类研究工作。一是研制了在电场和磁场作用下，导电金涂层半球与平板在溶剂中10 nm ~ 1 μ m小距离处相互作用力的测量仪器。当在半球和板之间的硅油中施加电场时，在小于0.5 μ m的距离内在约50 nm的硅油分子长度附近周期性地观察到粘附和排斥的振荡。另一方面，电流变液分散蒙脱石在硅油中的电场下的相互作用力表现出振荡在约0.1 μ m的周期，这表明二次凝聚直径。磁力施加在半球和板的周围。另一项研究是利用磁流体中的有机硅作为溶剂，利用粒子间的凝聚和分散作用。采用载体浮选法浮选超细硅灰石，磁选法分选细粒黑钨矿。在油酸钠捕收剂体系中，以粗粒白云母和其它粗粒矿物白铅矿、方铅矿、石英为载体，研究了白云母颗粒（~ 5 μ m）的浮选。细颗粒回收率从50%提高到95%。以粗粒磁铁矿为载体，油酸钠为表面活性剂，采用高梯度磁选机对黑钨矿进行了分选研究。采用0.27T载体磁选，使细粒黑钨矿的回收率由50%提高到90%。