提高黄金选矿厂磨矿效率的工业应用

云南黄金矿业集团股份有限公司下属某矿山磨矿系统已满足不了氰化浸出更高的细度要求。通过改变磨矿介质,大幅度增加了矿浆中-0.045 mm粒级含量,提高金的浸出率1.7%以上,经济效益显著。     

Investigation on the Current Transport Characteristics of SrTiO<Subscript>3</Subscript>/YBa<Subscript>2</Subscript>Cu<Subscript>3</Subscript>O<Subscript>7−x</Subscript> Heterostructure

By the combined use of the sol-gel and pulsed laser deposition methods, the SrTiO₃/YBa₂Cu₃O_7?x (STO/YBCO) heterostructure was prepared on a LaAlO₃ substrate. XRD results and φ scanning test showed that the prepared STO/YBCO heterostructure had good biaxial texture. Moreover, a Pt electrode was sputtered on the STO/YBCO heterostructure to investigate the current density-voltage (J ? V) characteristic curves of STO/YBCO in the 50–300 K temperature range. The results showed that the STO/YBCO heterostructure had good rectifying characteristics. With an applied positive bias voltage smaller than 3.7 V, the current density of the STO/YBCO heterostructure decreased with the decrease of temperature; for higher voltages, on the contrary, the current density increased with the decrease of temperature. When the YBCO experienced superconducting transition, the turn-on voltage (V _t) changed suddenly due to the sudden opening of the superconducting energy gap of YBCO. The V _t variation obtained from the experiment was essentially consistent with the known value of the YBCO superconducting energy gap.     

Fabrication of YBCO superconducting microarray by sol-gel process using photosensitive metal chelates

We used yttrium acetate, barium acetate, and copper acetate as the starting materials, benzalacetone (BzAcH) as chemical modifier, and methanol (MEOH) as solvent to synthesize a stable fluorine-free YBCO precursor sol. The coated YBCO gel film using this precursor sol exhibited photosensitivity to UV irradiation at a wavelength of 330 nm. After the subsequent exposing, the YBCO gel film showed a decreased solubility in several organic solvents. Based on the photosensitivity of the YBCO/BzAcH gel film, YBCO superconducting microarray with the pitch of 5 μm was fabricated by irradiating the gel film with UV light through a mask, followed by leaching the unirradiated area in a mixture solvent of methanol and n-butyl alcohol with the volume ratio of 1:1. After proper heat treatment the x-ray diffraction result showed that the as-prepared arrays were highly c-axis oriented and with a high T c by this new photosensitive sol-gel process.     

Fabrication of inorganic film gratings and study on their diffraction properties

A novel process for fabricating high-density and high diffraction efficiency inorganic gratings has been proposed by combining laser interference and chemical etching. In the present work, UV photosensitive Zr-contained sol was synthesized, and photosensitive ZrO₂/BzAc gel films on (100) silicon were prepared using the sol-gel method. Subsequently, inorganic film gratings with a pitch of 1 μm were fabricated by laser interference in this photosensitive gel film combining with the process of heat treatment. In order to increase the depth-to-width ratio of the gratings, chemical etching was adopted by using iodine-saturated KOH as anisotropic etchant, which improved the diffraction efficiency of the gratings effectively. Furthermore, the diffraction efficiency was improved by gold coating to enhance the surface glossiness and reflection coefficient. Supported by the National Natural Science Foundation of China (Grant No. 90401009) and the Xi’an Applied Materials Innovation Fund (Grant No. XA-AM-200611)     

高频群脉冲电化学加工电流检测电路设计

主要介绍了高频群脉冲电化学加工的基本原理,重点分析了加工过程中电流检测及短路保护措施及电路设计方案,其次介绍了待检测的电流信号形式及电子功率器件——绝缘栅双极型晶体管（Insulated-Gate Bipolar Transistor,IGBT）.针对应用实例,选择的电流测量方法为电流-磁场转换法的霍尔传感器.阐述了保护电路的设计,并分析了电路的性能,证明能够满足加工需要.     

在LiCl-KCl-CeCl3熔盐中铝电极上欠电位沉积制备Al-Ce合金

在843K LiCl-KCl-CeCl3熔盐中活性铝电极上,研究了Ce(III)离子的电化学行为和欠电位沉积Al-Ce合金。对比循环伏安曲线发现,在Al电极上Ce(III)/Ce反应的氧化还原电势比在Mo惰性电极上更正;开路计时电位在金属铝和铈的沉积平台之间出现两个平台,这表明Ce(III)在Al活性电极上可以生成两种金属间化合物。以上结果在电化学机理上说明Ce(III)离子可以在Al电极上欠电位沉积形成金属间化合物。在该实验条件下通过恒电位电解,在Al电极上得到了Al-Ce合金,验证了理论分析的结果。经XRD表征,证实了形成AlCe和AlCe3两种合金;经SEM和EDS表征,证明了铈分布在Al电极表面厚度均一的合金镀层中（厚度28?m）。 关键词：LiCl-KCl熔盐;欠电位沉积;铝电极;Al-Ce合金     

提高某铜矿银回收率浮选试验研究

为了提高云南某铜银硫化矿银回收率,通过试验研究对2000 t/d选矿厂的工艺流程进行了优化。试验结果表明,在原磨浮工艺流程上,采用石灰加KJ14作组合抑制剂来提高银回收率,新的药剂制度对该矿石具有良好的适应性。     

全果柑橘利口酒的加工技术研究

以两系杂交糯高粱酒作基酒,单独或混合浸泡红橘、红温州蜜柑、脐橙、黄温州蜜柑的全果浆汁,酿制成乙醇体积分数为40%～20%,糖度为360～210g/L的成品酒。然后对其感官指标、理化指标和卫生指标进行评价。通过对关键工艺操作和风味调整进行正交实验,确定最适工艺条件是:1L60%的基酒中加入260g果浆[m(红橘)∶m(脐橙)=2∶1],在40℃条件下浸泡40h;适宜调配参数是:糖度270g/L,pH值4.5,乙醇体积分数为20%。所得成品酒色泽金黄,清亮透明,酒体协调,有独特的柑橘果香,口感纯正,酸甜适度。     

降低硅微机械加速度传感器横向灵敏度的方法

本文分析了硅微机械加速度传感器横向灵敏度产生的原因,并介绍了降低它的方法。