摘要:

AbstractThree liquid‐liquid extraction processes were tested in continuous equipment, on bench scale, to determine their relative merits in the purification of uranium as found in ion exchange eluates of various Canadian leach plants. Tri‐n‐butyl phosphate and dibutyl butylphosphonate were used as extractants on nitrate eluates. A tertiary amine was used in the case of sulphuric acid eluates. Optimum conditions for high recovery and low reagent costs were established, and the adaptability of the processes to existing leach plants is discussed. The suitability of the ammonium diuranate product as a source of ceramic‐grade UO2was also investigated. Suggested changes to the adopted flowsheets are given, for further testing on a pilot plan

ISSN:0008-4034    

DOI:10.1002/cjce.5450390602

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1961

数据来源: WILEY

摘要:

AbstractMethods of photographing bubbles and drops moving in a liquid field are described. Shape, size, terminal velocity, local semi‐vectorial velocities, size distribution and high speed phenomena such as coalescence and breakup can be advantageously investigated by photographic methods. Recommended combinations of lights, reflectors, diffusers, screens, films, andf‐stop values are given. Applications of particle trace and interrupted particle trace photography are descri

ISSN:0008-4034    

DOI:10.1002/cjce.5450390603

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1961

数据来源: WILEY

摘要:

AbstractMeasurements of the liquid diffusion coefficients over the complete range of compositions of the ethanol‐water system at 25°C. have been carried out using the porous diaphragm technique with a magnetically‐stirred and modified cell. Both the integral and differential coefficients agree very closely with the values reported by Hammond and Stokes, although an improved method of calculating the differential coefficients has been used. The limiting values at 0 and 100% concentrations differ somewhat from those previously reported. By means of an experimental investigation the work of Smith and Storrow on the same system has been shown to be in error. Analytical errors in calibration have been reduced to a probable error of ± 0.1%, although there is an average deviation of ± 2% for all experimental points relative to the best line drawn through them. The diffusion coefficients based on concentration as a driving force, show a minimum at 25 mole % ethanol, corresponding to the minimum for the relative decrease in volume on mixing and the maximum for the viscosity‐composition curve. For the dimensionless Schmidt number, a very sharp peaking to a value of 7500 occurs at the same com

ISSN:0008-4034    

DOI:10.1002/cjce.5450390604

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1961

数据来源: WILEY

摘要:

AbstractThe concurrent vertical upward flow of air and water has been made at various rates and ratios of air to water in a 2 1/8‐in. × 20 ft. open transparent Tenite tube as well as in a 1 5/16‐in. × 2 1/8‐in. annulus. Pressure drops and in‐place ratios of gas to liquid have also been observed in order to correlate such data with corresponding flow types and patterns. Motion pictures taken at normal and especially those at high‐speed have made it possible to see flow mechanisms indistinguishable to th

ISSN:0008-4034    

DOI:10.1002/cjce.5450390605

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1961

数据来源: WILEY

摘要:

AbstractAn approximate analysis is made of the effect of the absorption of thermal radiation on the temperature gradients surrounding an evaporating droplet which is suspended in a high temperature environment. The Hottel‐Cohen method for calculating the radiant heat flux distribution in an enclosure containing an absorbing medium of non‐uniform temperature, has been applied to the spherical symmetrical model of the system. Conduction and radial movement of the cold vapor from the droplet have been included.The analysis shows that, at atmospheric pressure, the absorption of radiant energy in the boundary layer is very small and hence does not affect the temperature gradient nor the rate of heat transfer at the droplet surface.This method of analysis, with the associated solution of the equations describing the reception factors, is quite general and can be applied to any spherical enclosure containing an absorbing medium whether it be one of concentric or hollow sphe

ISSN:0008-4034    

DOI:10.1002/cjce.5450390606

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1961

数据来源: WILEY

摘要:

AbstractIn hydro‐metallurgical processes for the production of nickel and cobalt, the leach solutions usually contains salts of nickel, cobalt and copper. To recover high purity nickel and cobalt metals from such solutions, the copper is removed prior to the nickel‐cobalt separation.During the course of extensive investigations to determine the most economical and efficient methods for separating the copper, it was established that copper in solution reacts with elemental sulphur in the presence of sulphur dioxide forming a copper sulphide precipitate. This reaction permits a simple and quantitative separation of copper from nickel and cobalt leach solutions.The variables affecting this reaction were studied and the results are presented in this paper. Studies were conducted on: the sulphur concentration between 0 to 2.0/1 molar ratio of sulphur to copper, the sulphur dioxide concentration 0 to 17 gpl., the temperature in the range from 100°F. to 325°F., the copper concentration from 1 to 30 gpl. and pH from 1.0 to 9.0.The results are correlated and a tentative mechanism for the reaction is disc

ISSN:0008-4034    

DOI:10.1002/cjce.5450390607

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1961

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450390608

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1961

数据来源: WILEY

摘要:

AbstractA pilot plant has been designed and constructed for the exploration of reforming processes at temperatures up to 1200°F. and pressures up to 1500 p.s.i.g. The components of the pilot plant are described, as well as the calculation of material balances and product yields by an IBM 650 computer

ISSN:0008-4034    

DOI:10.1002/cjce.5450390609

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1961

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450390601

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1961

数据来源: WILEY