闪锌矿的浸出与传质分离耦合机理和氧化铁纳米粉制备中的物理化学
文献类型：学位论文
| 作者 | 王兴尧 |
| 学位类别 | 博士 |
| 答辩日期 | 2003 |
| 授予单位 | 中国科学院过程工程研究所 |
| 授予地点 | 中国科学院过程工程研究所 |
| 导师 | 卢立柱 |
| 关键词 | 分离耦合 湿法浸出 硫化锌矿 水热反萃 纳米α-氧化铁 |
| 其他题名 | Coupling mechanism of leaching and mass transfer and separation for sphalerite and physical chemistry o preparation of nanosized ferric oxide powder |
| 学位专业 | 化学工艺 |
| 中文摘要 | 对硫化物矿的浸出与传质分离耦合机理进行了理论说明,讨论了影响硫化物矿浸出与传质分离耦合的一些因素.针对FeCl<,3>-HCl-C<,2>Cl<,4>体系浸出硫化锌精矿过程,建立了固体产物层扩散控制和混合扩散控制浸出的核收缩动力学模型.提出了闪锌矿氧化浸出与协同萃取分离耦合操作模式,探讨了由氧化浸出剂(H<,2>SO<,4>-HNO<,3>-O<,2>)、四氯乙烯和磷酸二(2-乙基己基)酯组成的复合萃取剂和表面活性剂对浸出的影响.考察了影响载铁环烷酸-异辛醇-煤油体系水热反萃过程的一些因素,如有机相中铁和环烷酸的初始浓度、外加晶种(Fe<,2>O<,3>)的质量、温度和时间等,导出了过程的速率方程.应用水热反萃技术从负载铁的环烷酸-异辛醇-煤油有机相制备了α-Fe<,2>O<,3>纳米粉末.XRD和TEM测试表明,产品颗粒组成均一、结晶完好、近似椭球形,且粒径在纳米范围. |
| 英文摘要 | The coupling process of leaching of sulphide ore with solvent extractive was explained theoretically and some factors effecting on coupling process were discussed. Aiming at the leaching of zinc sulfide minerals with FeCl 3 -HC1-C2C14, the leaching kinetic models for solid layer diffusion control and mix diffusion control have been derived respectively according to theoretic analysis and experiment data. The kinetic studies and SEM analytical results of mineral surface show that at the same stilting intensity,the leaching with FeCl 3 -HC1 accords with the kinetic model of solid layer diffusion control. When tetrachloroethylene(C2Cl4) is added in the leaching, the diffusion speed increases significantly, and it can turn the kinetic model of solid layer diffusion control into mix diffusion control as the volume of tetrachloroethylene in FeCl 3 -HC1-C2C14 increases so that the rate of leaching is accelerated remarkably. The coupling model of oxidation leaching for sphalerite and separation of coordinated extraction has been put forward, and the effects on leaching of oxidation reagent (H2SO4-HNO3-O2), complex extractive reagent of tetrachloroethylene and 2-ethylhexyl 2-ethylhexylphosphate and surfactant have been discussed. The result show the leaching rate of zinc in coupling process is higher than oxidation leaching, the separation of zinc, sulfur and iron was completed in the same equipment, and obtained high-grade sulfur and Fe2O3 nano-powders. Some factors effected on hydrothermal stripping from iron-loaded organic phase of naphthenic acid-isooctyl alcohol-kerosene, such as initial iron concentration and naphthenic acid concentration, the amount of "seed" of Fe2O3, temperature and time, have been investigated. The process rate equations were established. The results show that the process activation energy are 96.4 kJ/mol for homogeneous stripping and 114 kJ/mol for heterogeneous. The hydrothermal stripping is controlled by the hydrolysis of naphthenic compound of iron. The technique of hydrothermal stripping was applied to the preparation of nanosized a-Fe2O3 powders from iron -loaded organic phase of naphthenic acid-isooctyl alcohol-kerosene. X-ray powder diffraction pattern indicates that the product is the a-Fe2O3 powder and transmission electron microscopy images show that the particle is homogenous in the shape quasi-elliptical sphere" with an average diameter of nanometer grade. Some factors influencing the granularity of Fe2O3 powders obtained by the hydrothermal stripping from the iron-loaded organic phase were investigated. The results show that the granularity of Fe2O3 powder may be controlled by changing iron concentration, temperature, pH of the aqueous and stripping time, and by adding the surfactant. |
| 语种 | 中文 |
| 公开日期 | 2013-09-16 |
| 页码 | 78 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1385]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 王兴尧. 闪锌矿的浸出与传质分离耦合机理和氧化铁纳米粉制备中的物理化学[D]. 中国科学院过程工程研究所. 中国科学院过程工程研究所. 2003. |
入库方式： OAI收割
来源：过程工程研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。