采用磨矿—弱磁选—中强磁选—中强磁选精矿再磨后反浮选工艺流程对辽宁某深埋铁矿石进行了选矿工艺研究。结果表明,对铁品位为29.22%、赤褐铁占总铁67.76%、脉石矿物以石英为主的试样,在磨矿细度为-0.043 mm占75%的情况下,经1次弱磁选...采用磨矿—弱磁选—中强磁选—中强磁选精矿再磨后反浮选工艺流程对辽宁某深埋铁矿石进行了选矿工艺研究。结果表明,对铁品位为29.22%、赤褐铁占总铁67.76%、脉石矿物以石英为主的试样,在磨矿细度为-0.043 mm占75%的情况下,经1次弱磁选(磁场强度为95.50 k A/m)。1次中强磁选,中强磁选精矿再磨至-0.038mm占90%后经1粗1精3扫、中矿顺序返回反浮选,弱磁选精矿与反浮选精矿合并为最终精矿,其铁品位为67.26%、铁回收率为84.68%。试验指标理想,工艺流程简单,可作为该铁矿石资源开发利用的依据。展开更多
A three-layer structure model is proposed for investigating the effect of a soft elastic middle layer on the propagation behavior of Love waves in piezoelectric layered systems, with ＂soft＂ implying that the bulk-sh...A three-layer structure model is proposed for investigating the effect of a soft elastic middle layer on the propagation behavior of Love waves in piezoelectric layered systems, with ＂soft＂ implying that the bulk-shear-wave velocity of the middle layer is smaller than that of the upper sensitive layer. Dispersion equations are obtained for unelectroded and traction-free upper surfaces which, in the limit, can be reduced to those for classical Love waves. Systematic parametric studies are subsequently carried out to quantify the effects of the soft middle layer upon Love wave propagation, including its thickness, mass density, dielectric constant and elastic coefficient. It is demonstrated that whilst the thickness and elastic coefficient of the middle layer affect significantly Love wave propagation, its mass density and dielectric constant have negligible influence. On condition that both the thickness and elastic coefficient of the middle layer are vanishingly small so that it degenerates into an imperfectly bonded interface, the three-layer model is also employed to investigate the influence of imperfect interfaces on Love waves propagating in piezoelectric layer/elastic sub- strate systems. Upon comparing with the predictions ob- tained by employing the traditional shear-lag model, the present three-layer structure model is found to be more ac- curate as it avoids the unrealistic displacement discontinuity across imperfectly bonded interfaces assumed by the shearlag model, especially for long waves when the piezoelectric layer is relatively thin.展开更多
文摘采用磨矿—弱磁选—中强磁选—中强磁选精矿再磨后反浮选工艺流程对辽宁某深埋铁矿石进行了选矿工艺研究。结果表明,对铁品位为29.22%、赤褐铁占总铁67.76%、脉石矿物以石英为主的试样,在磨矿细度为-0.043 mm占75%的情况下,经1次弱磁选(磁场强度为95.50 k A/m)。1次中强磁选,中强磁选精矿再磨至-0.038mm占90%后经1粗1精3扫、中矿顺序返回反浮选,弱磁选精矿与反浮选精矿合并为最终精矿,其铁品位为67.26%、铁回收率为84.68%。试验指标理想,工艺流程简单,可作为该铁矿石资源开发利用的依据。
基金supported by the National Natural Science Foundation of China(10972171)the Program for New Century Excellent Talents in Universities(NCET-08-0429)the National 111 Project(B06024)
文摘A three-layer structure model is proposed for investigating the effect of a soft elastic middle layer on the propagation behavior of Love waves in piezoelectric layered systems, with ＂soft＂ implying that the bulk-shear-wave velocity of the middle layer is smaller than that of the upper sensitive layer. Dispersion equations are obtained for unelectroded and traction-free upper surfaces which, in the limit, can be reduced to those for classical Love waves. Systematic parametric studies are subsequently carried out to quantify the effects of the soft middle layer upon Love wave propagation, including its thickness, mass density, dielectric constant and elastic coefficient. It is demonstrated that whilst the thickness and elastic coefficient of the middle layer affect significantly Love wave propagation, its mass density and dielectric constant have negligible influence. On condition that both the thickness and elastic coefficient of the middle layer are vanishingly small so that it degenerates into an imperfectly bonded interface, the three-layer model is also employed to investigate the influence of imperfect interfaces on Love waves propagating in piezoelectric layer/elastic sub- strate systems. Upon comparing with the predictions ob- tained by employing the traditional shear-lag model, the present three-layer structure model is found to be more ac- curate as it avoids the unrealistic displacement discontinuity across imperfectly bonded interfaces assumed by the shearlag model, especially for long waves when the piezoelectric layer is relatively thin.
