石英与蛇纹石异相凝聚及其对黄铁矿浮选的影响

通过单矿物和人工混合矿的浮选试验、Zeta电位测试、吸附量测试,研究了蛇纹石和石英异相凝聚的机理,以及对黄铁矿浮选的影响,以进一步探索多种矿物的体系中,蛇纹石对硫化矿物浮选影响的主要原因。结果表明:通过添加石英,可以恢复黄铁矿对捕收剂的吸附量,减弱蛇纹石的不良影响,不同粒级的石英与蛇纹石的异相凝聚作用强弱不同,粒级越细的石英,与蛇纹石的异相凝聚作用越强。     

浮选柱研究和应用进展

简要回顾了浮选柱发展的历史，对其近几十年的研究和应用进展进行了较全面的论述，并对其今后的发展趋势进行了预测。     

Kinetics of nickel leaching from roasting-dissolving residue of spent catalyst with sulfuric acid

Sulfuric acid leaching process was applied to extract nickel from roasting-dissolving residue of a spent catalyst, the effect of different parameters on nickel extraction was investigated by leaching experiments, and the leaching kinetics of nickel was analyzed. The experimental results indicate that the effects of particle size and sulfuric acid concentration on the nickel extraction are remarkable; the effect of reaction temperature is mild; while the effect of stirring speed in the range of 400–1 200 r/min is negligible. Decreasing particle size or increasing sulfuric acid concentration and reaction temperature, the nickel extraction efficiency is improved. 93.5% of nickel in residue is extracted under suitable leaching conditions, including particle size (0.074–0.100) mm, sulfuric acid concentration 30% (mass fraction), temperature 80 °C, reaction time 180 min, mass ratio of liquid to solid 10 and stirring speed 800 r/min. The leaching kinetics analyses shows that the reaction rate of leaching process is controlled by diffusion through the product layer, and the calculated activation energy of 15.8 kJ/mol is characteristic for a diffusion controlled process. Foundation item: Project (50574101) supported by the National Natural Science Foundation of China; Project (2003UDBEA00C020) supported by the Collaborative Project of School and Province of Yunnan Province, China     

石煤空白焙烧过程热力学分析

从热力学上对石煤空白焙烧过程中发生的相关氧化反应进行了分析.有机碳、黄铁矿及钒的氧化反应,在热力学上都可自发进行,有机质和黄铁矿比钒更容易氧化.有机碳和黄铁矿的存在,对钒的氧化有阻碍作用,若预先脱碳或脱除黄铁矿,则有利于钒的氧化.     

电化学调控浮选能带模型及应用(Ⅲ)——有机抑制剂对硫化矿物能带结构的影响

用能带理论分析了电化学调控浮选模型 ,提出了采用有机抑制剂来改变矿物电子能级、实现硫化矿的浮选分离。研究了有机抑制剂对矿物抑制的两种电化学机理 :一是有机抑制剂增加了矿物费米能级 ,矿物电子向黄药的空能级传递 ,双黄药被还原 ;二是有机抑制剂降低了矿物边缘能级 ,从而导致矿物表面电子密度增大 ,黄药空能级被电子占据 ,双黄药被还原。开发了 5种电化学浮选分离新型有机抑制剂 ,实现了 8种人工混合精矿和3种矿石的浮选分离。     

新型铜铅分离有机抑制剂ASC的研究

研究了ｐＨ和矿浆电位对新型小分子有机抑制剂ＡＳＣ对黄铜矿和方铅矿的抑制作用的影响,结果表明ＡＳＣ对方铅矿具有很好的抑制作用,对黄铜矿没有抑制作用。人工混合矿和实际矿石试验表明采用ＡＳＣ能够代替重铬酸盐实现铜铅分离。     

一水硬铝石(α-AlOOH)及其(010)表面的密度泛函研究

采用基于密度泛函-赝势的量子化学方法研究了一水硬铝石(α-AlOOH)晶体及其(010)表面的原子和电子结构.研究表明: GGA-PBE几何优化得到的晶体结构参数与实验测定数据相符; 通过体相原子间重叠布局分析确定了α-AlOOH(010)表面最容易解理的位置; 通过一系列测试计算选择原子层数为4, 真空层厚度为7.5的slab模型模拟α-AlOOH(010)表面, 结果表明表面原子发生弛豫, 且驰豫表面的表面能为0.491J/m2; 根据表面态密度分析、表面原子排布情况和前线轨道理论推测, 阴离子捕收剂很难与一水硬铝石(010)的表面Al原子间发生化学作用, 却容易与水硬铝石(010)的表面H原子相互作用.     

New technique of comprehensive utilization of spent Al2O3 -based catalyst

A new technology was developed to recover multiple valuable elements from the spent Al2O3-based catalyst by X-ray phase analysis and exploratory experiments. The experimental results show that in the condition of roasting temperature of 750 ℃ and roasting time of 30 min, molar ratio of Na2O to Al2O3 of 1.2, the leaching rates of alumina, vanadium and molybdenum in the spent catalyst are 97.2%, 95.8% and 98.9%, respectively. Vanadium and molybdenum in sodium aluminate solution can be recovered by precipitators A and B, and the precipitation rates of vanadium and molybdenum are 94. 8% and 92. 6%. Al（OH）3 was prepared from sodium aluminate solution in the carbonation decomposition process, and the purity of Al2O3 is 99. 9% after calcination, the recovery of alumina reaches 90. 6% in the whole process; the Ni-Co concentrate was leached by sulfuric acid, a nickel recovery of 98. 2% and cobalt recovery over 98.5% can be obtained under the experimental condition of 30% H2SO4, 80 ℃, reaction time 4 h, mass ratio of liquid to solid 8, stirring rate 800 r/min.     

氧化铜矿浮选研究进展

详细评述了氧化铜矿的浮选方法与工艺及浮选药剂研究进展,指出强化硫化过程、硫化质量和寻找具有高度选择性的捕收剂是其重要的研究方向