Beamline design for multipurpose muon beams at CSNS EMuS

A new muon beam facility,called the Experimental Muon Source(EMuS),was proposed for construction at the China Spallation Neutron Source(CSNS).The design of the complex muon beamlines for the EMuS baseline scheme,which is based on superconducting solenoids,superferric dipoles and room-temperature magnets,is presented herein.Various muon beams,including surface muons,decay muons and low energy muons,have been developed for multipurpose applications.The optics design and simulation results of the trunk beamline and branch beamlines are presented.With a proton beam power of 25 kW at a standalone target station that consists of a conical graphite target and high-field superconducting solenoids,the muon beam intensity in the trunk beamline varies from 10^(7)/s for surface muons to 10^(10)/s for high-momentum decay muons.And at the endstations,these values vary from 10^(5)/s for surface muons to 10^(8)/s for decay muons.

Study on Scandium Separation from Rare Earth Ore in Yunnan Province

Chemical components, main mineral content and mineral composition of rare earth ore in Yunnan Province was measurated by the analysis of the spectrum and the chemical components. The study shows that main metals mineral in the rare earth ore are magnetite, tatanomagnetite, limonite; less metals mineral are ilmenite, hematite; some minim minerals were iron pyrites, zircon, scheelite, and so on. Main nonmetals mineral are quartz, feldspar(plagioclase, K-feldspar); less nonmetals mineral are hopfnerite, biotite, titanite; some minim minerals are kaolinite and dolomite. Ilmenite has the highest content of Sc as 175 g·t -1, next is titanite as 81.2 g·t -1. Based on this result, A new method of extracting Sc is put forward. The technological flowsheet of separating Sc of low-intensity magnetic separation,tabing, gravity concentrate, high-gradient magnetic separation, and electrostatic separation was prepared. Amplified experiment obtained Sc concentrate with Sc content of 148.54 g·t -1, the yield of 7.92%,recovery of 69.20%, at the same time, a Fe concentrate with the grade of 63.88% and the yield of 5.91% is obtained.

Study of talcum charging status in parallel plate electrostatic separator based on particle trajectory analysis

Electrostatic separation has been extensively used in mineral processing,and has the potential to separate gangue minerals from raw talcum ore.As for electrostatic separation,the particle charging status is one of important influence factors.To describe the talcum particle charging status in a parallel plate electrostatic separator accurately,this paper proposes a modern images processing method.Based on the actual trajectories obtained from sequence images of particle movement and the analysis of physical forces applied on a charged particle,a numerical model is built,which could calculate the charge-to-mass ratios represented as the charging status of particle and simulate the particle trajectories.The simulated trajectories agree well with the experimental results obtained by images processing.In addition,chemical composition analysis is employed to reveal the relationship between ferrum gangue mineral content and charge-tomass ratios.Research results show that the proposed method is effective for describing the particle charging status in electrostatic separation.

Plastic wastes recovery using electrostatic forces

Among the separation techniques used in industry,the triboelectric separation of insulating particles using rotary tube is an efficient technology employed in waste recovery and mineral industries.This process,also called free-fall triboelectric separation,is widely used for the sorting and the purification of granular materials resulting from industrial plastic wastes.This paper aims at the achievement of a comprehensive description of a laboratory triboelectric separator built up by the authors and its utilization for an experimental study carried out on granular samples containing particles of polyvinyl chloride(PVC)and polyethylene(PE).Thus,among the variable factors of the process,we analyzed the influence of the most important ones,i.e.,the rotational speed of the cylinder n(rpm),the applied high voltage U(kV),the charging time of the particles t(s),the mass of the sample m(g),and the composition percentage of the sample Cp(%).