La0.6Sr0.4Co1-yFeyO3钙钛矿复合氧化物的结构与电学性能

采用固相反应法合成出La0.6Sr0.4Co1-yFeyO3体系复合氧化物样品，XRD分析结果证实不同Co／Fe比例的样品中均形成菱形六面体钙钛矿结构，采用固相烧结法制备出致密的La0.6Sr0.4Co1-yFeyO3体系陶瓷。研究结果表明，在室温到900℃温度范围内La0.4Sr0.4CoO3(y=0)的电导率随温度的增加而单调降低，其它Co／Fe比例样品的电导率随着温度的增加出现最大值，电导率达到最大值的温度随Co／Fe比例的降低而提高。在低温段，La0.6Sr0.4Co1-yFeyO3体系的导电行为符合小极子导电机制，导电活化能随Co／Fe比例的降低而增加。     

固液混合铸造Al-40Si合金的显微组织和力学性能

采用固液混合铸造的Al-40Si合金组织细小，合金力学性能明显优于传统铸造和半固态加工合金，并且解决了传统铸造Al-40Si合金铸件难以热加工的问题。在本工艺条件下，当添加平均粒度为120μm的粉末且粉末添加量与合金熔体质量比为1时，Al-40Si合金中的初晶硅平均粒度可控制在30μm以下；材料的室温力学性能为：σb=119.6MPa，σ0．2=105MPa，δ=1．43％。     

PRESSURE DISTRIBUTION IN THE AIR-SPARGED HYDROCYCLONE

ＰＲＥＳＳＵＲＥＤＩＳＴＲＩＢＵＴＩＯＮＩＮＴＨＥＡＩＲ－ＳＰＡＲＧＥＤＨＹＤＲＯＣＹＣＬＯＮＥ￥Ｃｈｕ，Ｌｉａｎｇｙｉｎ；ＬｕｏＱｉａｎ（ＭｉｎｅｒａｌＥｎｇｉｎｅｅｒｉｎｇＤｅｐａｒｔｍｅｎｔ，ＮｏｒｔｈｅａｓｔｅｒｎＵｎｉｖｅｒｓｉｔｙ，Ｓｈｅ...     

高浓度熟料溶出的工艺研究

优化烧结法生产 ,提高产量、节约能耗是氧化铝生产急需解决的问题之一。实现高浓度溶出可以提高精液浓度 ,减少湿法系统物料流量 ,达到提高产能、增加产量、降低成品成本的目的。本文通过对国内外高浓度熟料溶出发展情况和烧结法影响高浓度溶出的因素进行分析研究 ,提出了提高熟料A/S的必要性 ;指出了适合我国条件的熟料A/S大小和生料配方 ;分析了温度和αk 对溶出和分离的影响机理和规律 ;提出了适合高浓度溶出的溶出条件和浓度大小。对生产有一定的指导意义。     

Corrosion of metals and alloys in mixed gas environments at elevated temperatures

The attack of nickel, cobalt, iron, and alloys of these metals containing chromium and aluminum, by gases containing sulfur-oxygen, carbon-oxygen, and nitrogen-oxygen has been studied at temperatures of 600 and 900°C. The degradation of these metals and alloys was characterized by using standard analytical techniques with emphasis on optical metallography. Three types of accelerated degradation were identified for the attack of alloys by gases containing another oxidant in addition to oxygen. One type of degradation occurred because of the formation of reaction products composed of mixtures of phases involving both of the oxidants. Another type resulted from the reaction of second oxidant phases with oxygen. The third form of degradation involved the development of less protective phases due to thermodynamic instabilities. Thermodynamic stability diagrams are used to help account for the effects produced by different elements in the alloys.     

Flow field in air-sparged hydrocyclone

ＦＬＯＷＦＩＥＬＤＩＮＡＩＲ－ＳＰＡＲＧＥＤＨＹＤＲＯＣＹＣＬＯＮＥＣｈｕ，Ｌｉａｎｇｙｉｎ；Ｌｕｏ，Ｑｉａｎ（ＭｉｎｅｒａｌＥｎｇｉｎｅｅｒｉｎｇＤｅｐａｒｔｍｅｎｔ，Ｐ．Ｏ．Ｂｏｘ１３９ＮｏｒｔｈｅａｓｔｅｒｎＵｎｉｖｅｒｓｉｔｙ，Ｓｈｅｎｙａｎ...     

混粉电火花镜面加工技术及应用

利用自行研制的混粉电火花镜面加工装置，对混粉电火花镜面加工影响因素，加工表面性能等进行了深入研究，找出了粉末特性，工件材料，粉末浓度及放电参数等对混粉电火花镜面加工的影响规律，给出了合理的混粉电火花镜面加工工艺条件，以文中确定的加工工艺条件对铸造和压铸模具进行混粉电火花镜面加工，结果表明，该技术能提高模具制造质量，降低工人劳动强度，缩短模具制造周期。     

STUDY ON PERMEATION OF ACETONE/NITROGEN MIXED GAS THROUGH AL2O3 MICROPOROUS MEMBRANES: MOLECULAR DYNAMICS

In this work, by applying Materials Studio 2.2 software package, molecular dynamics (MD) was performed to investigate the dynamic processes of 1:4 acetone/nitrogen mixed gas permeating through different Al₂O₃ microporous membranes. Three systems were modeled by considering different box lengths, microporous sizes, and textures of Al₂O₃ membranes to compare different permeation behaviors. In each system, initial mixed gas contained 20 acetone molecules and 80 nitrogen molecules, and its density was set to 0.1 g/cm³. Analysis on the concentration profiles of nitrogen molecules (N2) and acetone molecules (Ace) in each system at different sampling times was implemented to discuss the permeation behaviors of smaller N2 and larger Ace. The results showed that adsorption and diffusion occurred synchronously but adsorption was dominant for acetone molecules and that the adsorption on the floor surface of the feed gas region more easily reached equilibrium (local equilibrium) than the diffusion and the adsorption on the ceiling of the initially vacuum region. Furthermore, for nitrogen, adsorption followed diffusion. Higher temperature is in favor of the enrichment of acetone on the floor surface of the feed gas region but against the adsorption of nitrogen. The adsorptive layer was found to be a double-layer with COMPASS force field and to be a monolayer with PCFF force field.     

甲醛法测定铵盐含氮量

对甲醛法测定铵盐含氮量进行了研究，提出采用百里酚酞和酚酞混和指示剂进行测定。该法简单、快速、准确，能满足生产实际和样品检验需要。     

龙游黄铁矿灵山东部锌硫矿石选矿研究

提出抑制锌硫首先脱除石墨，铜铅混选及分离，锌硫化先浮选方案，获得了铅、锌、硫三种精矿产品，选矿指标较为理想。合理的利用了井下酸性水，降低了选矿成本和对环境的污染。