搅拌槽的结构设计

通过实例介绍了搅拌槽的槽体及槽盖的结构设计以及工艺接管的设计方法。     

冶金湿法搅拌槽功率计算方法

冶金湿法冶炼项目在搅拌槽设计时,经常会遇到电机功率的计算,由于搅拌介质参数较难获得,搅拌槽电机功率计算较为困难,本文从改、扩建项目中探讨搅拌槽电机功率的计算方法,介绍一种新的设计计算理念和方法。     

机械搅拌槽挡板的研究

分析挡板对搅拌功率的影响,指出标准挡板未必适应特定的工艺要求。探讨通过挡板截面结构的变化,改善叶轮的动力特性,提高搅拌体系的混合效率。     

半圆管挡板搅拌槽内的固液悬浮

为了提高固液悬浮性能,设计了一种半圆管挡板搅拌槽。采用数值模拟和试验测试相结合的方法,研究了半圆管挡板Rushton桨搅拌槽内石英砂—水的混合特性,分析了固液悬浮特征、固相浓度分布和功率消耗情况,并与标准平直挡板搅拌槽内的悬浮性能进行了对比。结果表明,同一搅拌转速时,半圆管挡板能改善悬浮性能,低固含率(5%)时效果更好。整体而言,半圆管挡板搅拌时石英砂的浓度分布比标准平直挡板搅拌时均匀,而且功率准数低13%左右,节能效应明显。研究结果为半圆管挡板的工业应用奠定了基础。     

Φ4.0×4.0m 精石灰搅拌槽改造实例

城门山铜矿选矿厂精石灰搅拌槽因设计不合理,导致搅拌混合效果差,沉槽严重,槽底结钙以及管路堵塞现象时常发生。通过增加桨叶直径,采用双层桨叶,同时对槽体结构进行优化,解决了 Φ4.0×4.0m精石灰搅拌槽搅拌能力不足,沉槽严重等问题。     

稀土萃取搅拌槽内两相混合过程的数值计算北大核心

应用CFD流体仿真软件对稀土萃取搅拌槽内两相料液的混合过程进行了三维数值模拟,通过搅拌混合过程中的非定常计算,得到了搅拌槽内挡板宽度与混合时间及搅拌能耗之间的关系。利用该方法可以确定最佳挡板宽度,达到优化槽体结构,提高整体混合性能的目的。同时也为其他类型搅拌设备的优化设计提供理论参考。     

湿法冶金搅拌槽设计过程中应注意的几个问题

本文从湿法冶金搅拌槽设计中实际遇到的问题,阐述解决的方法和有效措施,提供经济、合理和安全的设计理念,实现搅拌槽在生产中可靠、平稳的运行。     

湿法提钒搅拌反应釜的流场分布

为提高湿法提钒浸出率、掌握机械搅拌反应釜内液相流动和固相分布的规律,使用Fluent软件,基于计算流体力学理论,利用多重参考系法对浸钒搅拌釜内计算区域进行处理,建立多相流欧拉-欧拉模型和标准k-ε湍流模型,研究了搅拌速度v、桨叶离底高度L和带孔挡板对搅拌釜内流场分布的影响。结果表明:随着搅拌速度v的增大,搅拌釜内液相速度先逐渐增大,然后基本保持不变;根据桨叶离底高度L高低对搅拌釜内液相速度分布的影响,将最适宜离底高度选作L=0.4D1;安装带孔挡板有助于消除流场的漩涡现象,改善流场分布。     

铅阳极泥湿法搅拌系统中有关搅拌轴的改进设计

简要介绍了对铅阳极泥湿法搅拌系统中有关搅拌轴的结构改进思路,方法、经改进后的搅拌轴节约了材料,提高了临界转速,减少轴产生的振动,保护轴和设备不被损坏。     

氧化锌酸性浸出搅拌槽的设计特点

论述了将人德国ＥＫＡＴＯ公司进口的搅拌机进行消化、吸收后，将进口搅拌机的先进技术以及在生产实践中对基优异斩改造经验，应用于氧化锌浸出搅拌槽的设计，通过生产检验，取得圆满成功。     

湿法炼锌上料系统的设计改进

以某湿法炼锌工厂上料系统为例,介绍了该厂原有上料系统的设计特点,阐述了对某湿法炼锌工厂上料系统的设计改进思路,提出了一些有色冶金工厂上料系统设计的建议.     

石油液化汽站-混气装置的国产化设计与展望

介绍铜冶炼生产过程中石油液化气汽化、石油液化气汽化--空气混合装置的国产化设计、计算、运行及展望。     

湿法炼锌设计与环境保护

介绍了我国湿法炼锌筹建项目的环保审查、炼锌工艺与其产生的污染及对“三废”的治理措施。     

Binary Extraction in Hydrometallurgy

Abstract

Results obtained during technological application of binary extraction (extraction by salts of organic acids and organic bases) for recovery and separation of non-ferrous, rare, noble and associated metals are presented in the paper. The method of extraction of copper, especially from leaching solutions of oxidised ores, with the use of tertraoc-tylammonium dialkyldithiophosphate has been developed- The binary extractant is characterized by high separation coefficients of copper and iron, large capacity according to copper and high rate of its extraction and stripping by solutions of ammonia. The technology has also been tested in the sorption-extraction mode.

Possibilities of the use of binary extractants for the purification of sulphate solutions containing copper and iron, and also chloride solutions containing iron, have been discussed. The technological scheme developed for the purification of aluminium from iron in chloride solutions with the application of carboxylate of trialkylamine is characterized by a more concentrated strip solution obtained in comparison with the system based on trialkylamine.

The technology of the extraction of indium from Zn-containing sulphate solutions with the use of binary extraction by dialkylphosphate of trioctylamine has been developed and adopted at the Chetaybinsk zinc factory. The use of hydrochloric acid has been avoided in the stripping stage by the application of binary extractant. The technological scheme worked out for the extraction of cadmium from Zn-containing sulphate solutions with the use of carboxylate of trialkylamine allows one to achieve objectives of cadmium recovery in the form of chloride anion, cadmium concentration and conversion with the generation of cadmium sulphate solution suitable for cementation and also simultaneous purification of zinc sulphate solution from chloride ion with the production of concentrated solution of natrium chloride. Possible uses of binary extractants for the recovery of molybdenum as well as extraction and separation of platinum metals are also discussed.

In hydrometallurgy the extraction processes are most effectively applied to solve the following tasks:

?extraction (and usually simultaneous concentration) of valuable components in processing solutions with complex composition; - separation of elements with similar properties and their isolation into corresponding products;

?purification of aqueous technological solutions from elements - impurities; synthesis of inorganic compounds using, stripped solutions with definite element composition;

?purification of industrial sewage.

Obviously, an extractant is selected depending on the objectives. A search of extractants is a continuing process and a wide circle of specialists in the field of extraction chemistry and technology, organic synthesis, physical chemistry, and others take part inthis process. Recently processes of the so-called binary extraction have attracted re- searcher's attention considerably. A review of results obtained by us on the use of binary extraction for technological applications is given in the present paper.     

Emerging Technologies in Hydrometallurgy

The need for mining industries to be sustainable requires them to maintain the balance between global competition and environmental responsibility. Depletion of available and easily mineable reserves offers opportunities to develop novel processes to treat complex or lower grade ores. The need to meet stricter environmental guidelines will demand efficient use of process effluents and wastes and offer opportunities to recover values from mining and metallurgical wastes. The paper will discuss emerging hydrometel-lurgical applications in the mining industry from primary and secondary sources.

Effects of feed materials, environmental guidelines, process alternatives, product specifications and contactors will be reviewed with selected examples.     

湿法炼锌工艺中的综合回收

湿法炼锌工艺中产出多种废渣,其中含有多种有价金属.对这种废渣进行综合处理,既能提高金属回收率,保护环境,又能提高资源利用率和经济效益,符合循环经济理念.     

电锌厂铜的回收

分析了电锌厂铜回收的价值；指出铜在电锌生产中是有益元素，并阐述了铜回收的措施。     

真空技术在湿法冶金中的应用

介绍了真空技术如真空干燥与真空冷冻干燥、真空过滤、真空蒸发结晶在湿法冶金中应用状况.真空技术的应用对于整个湿法冶金工艺的节能、流程的连续性和产品质量有着非常重要的影响.     

湿法冶金新发展

根据收集的资料及多年的研究结果,系统地总结了湿法冶金中的新技术,分别阐述了浸出（加压浸出、活化浸出、细菌浸出、原地浸出）、溶剂萃取、离子交换、膜分离及电解方面的新发展与新技术,特别介绍了湿法制备粉体材料,并提出了湿法冶金的研究与应用方向。     

Hydrometallurgy in the mining industry

There are many links between microbiology and mining, and the number of such ties is continuing to grow. With its methods, concepts, and — ultimately — its products, modern chemistry is determining the technology of the future. However, research is needed in many different areas in order for this to continue. At the same time, development of the latest technologies in chemistry is requiring huge material resources, the latter being needed to establish new theoretical principles for the technologies, validate them in laboratory studies, and have the new methods undergo field testing and certification. Determining the optimum applications for microbiological methods of recovering metals and significantly expanding research in this area are important issues that need to be resolved as soon as possible.