硫化铜矿SAG(半自磨)磨矿废品浮选药剂的交互作用

浮选药剂在黏土矿中基础矿物的选矿中表现出复杂的行为.利用中心组合设计法研究浮选药剂对低品位高黏质硫化物矿中铜浮选效率的交互作用.初步结果表明,在石灰作pH调节剂的情况下,异丙基黄原酸钠(SIPX)和O-异丙基-N-乙基硫基氨基甲酸酯(IPETC)是最有效的捕收剂.在不同的pH值下,评估捕收剂(SIPX和IPETC)用量...     

Recent development in researches of electrochemistry of sulphide flotation at Central South University of Technology

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某厂含锑金矿浮选工艺改进研究

国内某厂含锑金矿的选矿回收率偏低。为提高选矿回收率,有效利用矿产资源,增加企业经济效益,进行了磨矿细度、浮选药剂捕收剂、抑制剂、活化剂种类和用量的实验研究。结果表明,在磨矿细度为-0.045 mm粒级占93.52%,抑制剂焦亚硫酸钠+新型药剂GT-1用量(200+200) g/t,活化剂硝酸铅用量400 g/t,捕收剂丁基钠黄药用量500 g/t、乙硫氮200 g/t,新型药剂GT-2用量400 g/t,起泡剂2^#油用量30 g/t条件下,经一粗四扫三精浮选闭路流程,锑回收率达77.33%,金回收率59.16%。结合闭路试验结果,对工业选矿生产流程进行了优化改进,技术指标提升明显。     

Flow of gas-liquid-solid system and its application in packed flotation column

A packed flotation column, which is packed with multiple board ripple packings, was described. Based on comprehensive steady state models, chemical reactor developed previously in chemical engineering subjects, have been extended to packed flotation column for mineral separation. The experimental results verify that tarts in series model is better than axially-dispersed plug flow model to describe flow pattern in the collection zone of column by RTD (residence time distribution), and the error of experimental data and calculated data of both models are 0. 07 % - 0. 1% and 0. 18 % - 0.45 % respectively. And, RTD of gas phase was also considered, results also show that gas in the whole column appears plug flow. The cleaning process through adding wash water in froth zone of column was described, and the effect of superficial air vdodty and superficial wash water vdocity on the cleaning action of froth zone were discussed. Flotation experiment for single column was conducted for phosphate ores. The recovery for P2Os was 85.8%, and the grade was 26.8%.     

酸性体系中蛇纹石矿泥的抑制及其对硫化铜镍矿浮选的影响

为了消除硫化铜镍矿物表面的氧化膜,抑制蛇纹石等含镁脉石矿泥对浮选影响,在硫化铜镍矿的酸性浮选工艺的基础上研究了羧甲基纤维素(CMC)对硫化铜镍矿浮选过程的优化效果,并探讨了CMC的作用机理。结果表明:1×10^?3 mol/L盐酸溶液及20 min超声预处理可以显著强化硫化铜镍矿的可浮性,酸性浮选体系可以在更宽的pH范围内取得较好的回收率;在pH=3的酸性体系中添加20 mg/L CMC,硫化铜镍矿浮选精矿镍品位提高至19.42%,回收率提高至60.05%;分别比同等条件下不添加CMC的浮选指标分别提高了1.78%和22.79%;CMC对蛇纹石矿泥选择性抑制是其优化硫化铜镍矿浮选过程的主要原因;浊度及表面动电位测试表明CMC加入量必须控制于20 mg/L以内,过量的CMC产生有团聚作用,不利于矿泥颗粒间的分散。     

Au-Ni合金中组元的平均原子体积和偏摩尔体积的关系

在系统合金科学框架中建立有关无序合金的平均摩尔性质（体积和势能）的函数。通过对这些函数进行推导,可以得到平均摩尔体积函数、偏摩尔体积函数及派生出与成分相关的函数。在组元的偏摩尔性质和平均摩尔性质之间的普适方程、差分方程、在偏摩尔性质和平均摩尔性质之间不同参数的约束方程和普适的Gibbs-Duhem公式。可以证明从合金平均摩尔性质的不同函数计算的偏摩尔性质是相等的,但总体来说偏摩尔性质不等于给定组元的平均摩尔性质,即偏摩尔性质不能代表相应组元的摩尔性质。通过计算Au-Ni系中组元的偏摩尔体积和平均原子体积以及合金的平均原子体积,证明所建立的公式和函数的正确性。     

焊剂带在超窄间隙电弧区的位置与约束电弧的关系

当超窄间隙中用于约束电弧的焊剂带与电弧具有不同的相对位置时,焊剂带会对电弧产生不同的约束效果,因而焊剂带在电弧区的位置是约束电弧的关键.通过分析焊剂带在电弧区的位置,结果表明焊剂带在电弧区有效约束电弧应满足三个位置条件,即在电弧横向焊剂带应紧贴两侧壁;在电弧长度方向焊剂带应具有合适的焊剂带作用长度;在超窄间隙纵向焊丝端...     

Relationship between half-cell potential and corrosion level of rebar in concrete

This work studies the influence of various parameters, such as temperature and humidity, fly ash content and chloride concentration, on the relationship between half-cell potential and the corrosion level of rebar in concrete. Results show that the half-cell potential decreases with an increase in temperature under the same corrosion level of rebar, and half-cell potential decreases with an increase in corrosion level of rebar under the same temperature. The half-cell potential decreases with an increase in chloride concentration and increases with an increase in fly ash content when fly ash content is lower than 50% under the same corrosion level of rebar, and the half-cell potential decreases with an increase in the corrosion level of rebar under the same chloride concentration and fly ash content.