新型螯合剂对一水硬铝石和铝硅酸盐矿物浮选行为的研究

合成了含有羧基和肟基的新型螯合捕收剂HCMT并研究其对一水硬铝石、高岭石和伊利石的浮选行为。单矿物浮选试验表明,该捕收剂对一水硬铝石、铝硅酸盐矿物的捕收能力差别较大,能有效分离一水硬铝石与铝硅酸盐矿物。通过动电位、红外光谱和电镜扫描(SEM)等研究了捕收剂对矿物的吸附机理,结果表明捕收剂在一水硬铝石表面可能是通过COOH、-NHOH与Al-O形成双环螯合物的化学吸附,而在高岭石、伊利石表面主要是物理吸附。     

六偏磷酸钠和壬基羟肟酸与铝铁矿物的作用机理研究

单矿物试验研究表明,以壬基羟肟酸和油酸钠作为组合捕收剂,采用六偏磷酸钠可以选择性抑制赤铁矿和高岭石。机理测试发现,壬基羟肟酸和六偏磷酸钠在赤铁矿和一水硬铝石表面的作用方式为化学吸附,且两种药剂在两种矿物表面存在竞争吸附。     

重庆中低品位铝土矿选矿精矿溶出性能工艺研究

针对重庆南川地区A/S 7.5以上选矿精矿进行溶出实验, 研究了相关的工艺参数对溶出过程的影响。结果表明: 在配料α_k为1.45、溶出温度260 ℃、溶出时间80 min、CaO添加量为矿石量的6%、溶出碱浓度为220 g/L的最优条件下进行溶出实验, 氧化铝的平均溶出率达到86%以上, 相对溶出率达到99%以上。     

脱硫体系下变性淀粉对一水硬铝石夹带浮选的影响及其机理研究

实现高硫铝土矿工业应用需要解决的难点之一就是如何减少一水硬铝石的夹带。通过单矿物浮选试验、动电位、扫描电镜等方法,研究了脱硫体系下减少一水硬铝石夹带的相关机理。变性淀粉可显著降低一水硬铝石的夹带率,变性淀粉加入不影响黄铁矿回收率,随着变性淀粉用量的增加,一水硬铝石的夹带率逐渐降低到一固定值。     

A novel depressor useful for flotation separation of diaspore and kaolinite

The floatation of the minerals diaspore and kaolinite was investigated using dodecylamine as the collector.Separating diaspore and kaolinite in a neutral pH pulp is difficult since they then have similar floatability.A depressor consisting of an AlCl3/Na2SiO3 mixture is demonstrated to solve this problem.Diaspore sinking may be seen when the ratio of AlCl3 to Na2SiO3 is 3:1.We refer to this mixture as ATNO.The influence of Al/Si ratio in the feedstock and the grain size of fed minerals on separation was exa...     

改善烧结法碳酸化分解产品质量的措施

本文简要阐述了提高氧化铝质量的必要性和紧迫性，并从烧结法碳酸化分解工艺着手，简介了碳酸化分解的工艺过程，同时从理论上分析了铝酸钠溶液碳酸化分解过程的变化规律，结合影响碳酸化分解产品质量的多种因素的试验结果，提出了碳分分解温度、分解时间、晶种特性和晶种添加量等是影响碳分产品质量的重要因素。     

一水硬铝石的热分解反应动力学

根据一水硬铝石(α-AlOOH)分解前后的X射线衍射(XRD)谱, 判断其热分解后主要生成α-Al2O3. 分别用Coats-Redfern积分法和Kissinger方法处理了不同升温速率下一水硬铝石的差热曲线, 两种方法得到的热分解反应动力学参数非常接近, 计算所得的活化能分别为254.54 kJ/mol和244.08 kJ/mol, 并推断了反应的动力学模型和反应机理. 研究表明一水硬铝石的热分解符合Mample单行法则, 相对应的机理为随机成核和随后增长.     

一水硬铝石强化溶出工艺技术改造

分析了新蒸汽直接加热压煮溶出技术存在的问题,提出了强化溶出工艺技术改造的思路,并进行了工业实践。结果表明:通过技术改造大大提升了高压新蒸汽直接加热溶出技术水平,大幅度降低了拜耳法生产氧化铝的能耗,技术经济指标明显优化,使压煮溶出工艺获得了较好的经济效益。     

Adsorption of copper（ Ⅱ ） and chromium（Ⅵ） on diaspore

The adsorption of Cu（ Ⅱ ） and Cr（Ⅵ） on diaspore was studied with the help of X-ray diffraction analysis, BET measurement, zeta potential measurement and atomic adsorption spectrometry. The adsorption equilibrium almost reaches within 60 min. The adsorption isotherms of Cu（ Ⅱ ） and Cr（Ⅵ） could be well described by the Langmuir equation. The adsorption capacities of Cu（Ⅱ） and Cr（Ⅵ） are 1.944 and 1.292 mg/g, respectively. The adsorption percentage of Cr（Ⅱ ） increases with the increment of solution pH, but the adsorption percentage of Cr（Ⅵ） decreases. This could be explained by zeta potential theoretical and electrostatic attraction between metal ions and diaspore surface.     

A novel depressor useful for flotation separation of diaspore and kaolinite

The floatation of the minerals diaspore and kaolinite was investigated using dodecylamine as the collector.Separating diaspore and kaolinite in a neutral pH pulp is difficult since they then have similar floatability.A depressor consisting of an AlCl3/Na2SiO3 mixture is demonstrated to solve this problem.Diaspore sinking may be seen when the ratio of AlCl3 to Na2SiO3 is 3.1.We refer to this mixture as ATNO.The influence of Al/Si ratio in the feedstock and the grain size of fed minerals on separation was examined.An Al/Si ratio in the concentrate greater than 11 may be obtained when the Al/Si ratio of the feed is between 2.53 and 4.96.However,the grain size of the diaspore greatly influences the concentrate grade.Finer grain size of the diaspore (＜40 μm)in pulp makes the flotation separation less than ideal,no matter what the kaolinite grain size.