共查询到19条相似文献，搜索用时 140 毫秒
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针对长坡选矿厂在全浮流程中添加大量药剂回收硫化矿,细粒、微细粒锡石易损失于全浮硫化矿中的特点,采用组合抑制剂BY-6抑制锡石,降低锡损失,使损失于全浮硫化矿中的锡石含量仅为13.48%。 相似文献
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通过对复杂难选的大厂锡石多金属硫化矿尾矿的矿石性质的分析,提出了采用先进的选矿工艺流程和先进技术,特别是合理地利用好分级技术,能实现在流程的前段大量丢尾,并为微细粒锡石的重选回收创造良好的分选条件,是成功回收大厂矿区低品位复杂难选锡石多金属硫化矿尾矿的关键。 相似文献
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从尾矿中回收微细粒锡石的研究与实践 总被引：1，自引：0，他引：1
通过对处理锡石多金属硫化矿尾矿的某选厂所丢弃的尾矿性质特点进行分析研究,采用重选法对其中难选的微细粒锡石进行再回收,获得了锡精矿品位4.17%、对原矿回收率3.33%的较好指标,进一步提高了矿产资源的利用率。 相似文献
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在含有大量矿泥以及高CN-浓度情况下,对氰化尾渣中微细粒钼矿物质的浮选条件进行了研究,通过采用预处理和新型选钼捕收剂YC,取得了较好的钼回收技术指标。 相似文献
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文章实验通过高效磨矿分级技术、铅锑浮选新药剂、高效锌硫分离技术、细泥锡石回收新技术的研究,研究出了更适合105号矿体矿石的工艺流程和新技术,解决了过去100号矿选矿存在的磨矿锡石过粉碎、铅锑精矿含锌较高、锌硫分离精矿质量难保证、作业回收率低、矿泥锡石选别指标差等长期存在的技术难题。 相似文献
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本刊讯 中国科学院23个研究所的500余名科研人员,经过几年的努力,在金矿理论、找矿实践和选冶技术上取得了一批可喜成果。最近中科院微细粒金选冶技术获得重大突破。微细粒金选冶是当今世界选冶技术难题之一,这一成果的取得将带来巨大的经济效益和社会效益。 相似文献
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聂洪彪 《内蒙古科技与经济》2006,(9):94-95
本试验采用两种联合流程,分别获得了粗粒(≥1mm)和细粒(-200目占90%)两种红柱石精矿产品,其中浮选合格精矿的总产率为8.56%,总回收率为61.24%,达到国家Ⅱ级品标准要求。 相似文献
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Brian Southworth 《Endeavour》1981,5(2):83-89
The Rutherford/Bohr concept of atomic structure was pleasingly simple but later research revealed a bewildering multiplicity of elementary particles. Recently, however, a ‘new physics’ has emerged according to which all these particles can be interpreted in terms of only four fundamental ones—two quarks and two leptons. To test this theory very powerful new machines are required, among the most important of which is the proposed electronpositron storage ring (LEP) at CERN. 相似文献
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Optical chromatography relies on the balance between the opposing optical and fluid drag forces acting on a particle. A typical configuration involves a loosely focused laser directly counter to the flow of particle-laden fluid passing through a microfluidic device. This equilibrium depends on the intrinsic properties of the particle, including size, shape, and refractive index. As such, uniquely fine separations are possible using this technique. Here, we demonstrate how matching the diameter of a microfluidic flow channel to that of the focusing laser in concert with a unique microfluidic platform can be used as a method to fractionate closely related particles in a mixed sample. This microfluidic network allows for a monodisperse sample of both polystyrene and poly(methyl methacrylate) spheres to be injected, hydrodynamically focused, and completely separated. To test the limit of separation, a mixed polystyrene sample containing two particles varying in diameter by less than 0.5 μm was run in the system. The analysis of the resulting separation sets the framework for continued work to perform ultra-fine separations. 相似文献
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Alexandra LaLonde Maria F. Romero-Creel Mario A. Saucedo-Espinosa Blanca H. Lapizco-Encinas 《Biomicrofluidics》2015,9(6)
Isolation and enrichment of low-abundant particles are essential steps in many bio-analytical and clinical applications. In this work, the capability of an insulator-based dielectrophoresis (iDEP) device for the detection and stable capture of low abundant polystyrene particles and yeast cells was evaluated. Binary and tertiary mixtures of particles and cells were tested, where the low-abundant particles had concentration ratios on the order of 1:10 000 000 compared to the other particles present in the mixture. The results demonstrated successful and stable capture and enrichment of rare particles and cells (trapping efficiencies over 99%), where particles remained trapped in a stable manner for up to 4 min. A device with four reservoirs was employed for the separation and enrichment of rare particles, where the particles of interest were first selectively concentrated and then effectively directed to a side port for future collection and analysis. The present study demonstrates that simple iDEP devices have appropriate screening capacity and can be used for handling samples containing rare particles; achieving both enrichment and isolation of low-abundant particles and cells. 相似文献
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Xiangzhi Zhang Jing Wang Chengbo Wang Zheng Lian Yong Shi Yong Ren Yuying Yan 《Biomicrofluidics》2021,15(2)
Detecting the existence of SARS-CoV-2 in the indoor atmosphere is a practical solution to track the prevalence and prevent the spread of the virus. In this work, a thermophoretic approach is presented to collect the novel coronavirus-laden aerosols from the air and accumulate to high concentrations adequate for the sensitivity of viral RNA detection. Among the factors, the density and particle size have negligible effects on particle trajectory, while the vertical coordinates of particles increase with the rise in heating source temperature. When the heating temperature is higher than , all of the particles exit the channel from one outlet; thus, the collecting and accumulating of virus-laden aerosols can be realized. This study provides a potential approach to accelerate the detection of SARS-CoV-2 and avoid a false negative in the following RNA test. 相似文献
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This work determines the dielectrophoretic response of surface modified polystyrene and silica colloidal particles by experimentally measuring their Clausius-Mossotti factors. Commercial charged particles, fabricated ones coated with fibronectin, and Janus particles that have been grafted with fibronectin on one side only were investigated. We show that the dielectrophoretic response of such particles can be controlled by the modification of the chemistry or the anisotropy of their surface. Moreover, by modelling the polarizabilities of those particles, the dielectric parameters of the particles and the grafted layer of protein can be measured. 相似文献
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Selection of particles or cells of specific shapes from a complex mixture is an essential procedure for various biological and industrial applications, including synchronization of the cell cycle, classification of environmental bacteria, and elimination of aggregates from synthesized particles. Here, we investigate the separation behaviors of nonspherical and spherical particles∕cells in the hydrodynamic filtration (HDF) scheme, which was previously developed for continuous size-dependent particle∕cell separation. Nonspherical particle models were prepared by coating the hemisphere of spherical polymer particles with a thin Au layer and by bonding the Janus particles to form twins and triplets resembling dividing and aggregating cells, respectively. High-speed imaging revealed a difference in the separation behaviors of spherical and nonspherical particles at a branch point; nonspherical particles showed rotation behavior and did not enter the branch channel even when their minor axis was smaller than the virtual width of the flow region entering the branch channel, w(1). The confocal-laser high-speed particle intensity velocimetry system visualized the flow profile inside the HDF microchannel, demonstrating that the steep flow-velocity distribution at the branch point is the main factor causing the rotation behavior of nonspherical particles. As applications, we successfully separated spherical and nonspherical particles with various major∕minor lengths and also demonstrated the selection of budding∕single cells from a yeast cell mixture. We therefore conclude that the HDF scheme can be used for continuous shape-based particle∕cell separation. 相似文献
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Catalytic Janus particles rely on chemical decomposition to self-propel and have displayed enormous potential for targeted drug delivery and cellular penetration. Catalytic propulsion mechanisms are limiting, however, with fuel requirements and specialized fluid properties being necessary to achieve propulsion. We have improved the dynamic propulsion of catalytic Janus particles by functionalizing flagellar filaments to one of their hemispheres. Flagellated Janus particles, torqued by rotating magnetic fields, swim along their rotation axis using the explicit chirality and flexibility of flagella, mimicking flagellar rotation of live bacteria. Depending on the working fluid, flagellated Janus particles can propel using either catalytic or swimming propulsion. We demonstrate experimentally that flagellated Janus particles behave predictably under the two actuation modes and can precisely follow trajectories under closed-loop feedback control. Flagellated Janus particles were demonstrated to swim in both Newtonian and shear-thickening fluids. These are the first Janus particles developed that can be propelled interchangeably between catalytic and flagellar swimming propulsion, allowing two distinct propulsion mechanisms for future use within in vivo operations. 相似文献
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The conventional microfluidic H filter is modified with multi-insulating blocks to achieve a flow-through manipulation and separation of microparticles. The device transports particles by exploiting electro-osmosis and electrophoresis, and manipulates particles by utilizing dielectrophoresis (DEP). Polydimethylsiloxane (PDMS) blocks fabricated in the main channel of the PDMS H filter induce a nonuniform electric field, which exerts a negative DEP force on the particles. The use of multi-insulating blocks not only enhances the DEP force generated, but it also increases the controllability of the motion of the particles, facilitating their manipulation and separation. Experiments were conducted to demonstrate the controlled flow direction of particles by adjusting the applied voltages and the separation of particles by size under two different input conditions, namely (i) a dc electric field mode and (ii) a combined ac and dc field mode. Numerical simulations elucidate the electrokinetic and hydrodynamic forces acting on a particle, with theoretically predicted particle trajectories in good agreement with those observed experimentally. In addition, the flow field was obtained experimentally with fluorescent tracer particles using the microparticle image velocimetry (μ-PIV) technique. 相似文献