GEOSCAN Search Results: Fastlink

GEOSCAN Menu


TitleStudies on the precipitation of sodium polyuranates from solutions of sodium uranyl tricarbonate
DownloadDownloads
 
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorHerbst, H J
SourceCanada Department of Mines and Technical Surveys, Mines Branch, Technical Paper no. 15, 1956, 29 pages, https://doi.org/10.4095/327616 Open Access
logo Open Access
Year1956
PublisherCanada Department of Mines and Technical Surveys
Documentserial
Lang.English
Mediaon-line; digital; paper
File formatpdf
Subjectsgeneral geology; geochemistry; Science and Technology; metallurgical tests; sodium; sodium carbonate; precipitates; experiments
Illustrationsfigures; tables; graphs; plots
Released1956 01 01; 2020 12 08
Abstract(Summary)
By addition of sodium hydroxide, sodium polyuranates are precipitated from solutions or leach liquors containing sodium carbonate and sodium uranyl tricarbonate. Excess hydroxide is required in amounts directly proportional to the concentration of sodium carbonate in the barren. The rate of precipitation, and consequently the efficiency, appear to vary directly with the amount of uranium present, and also to a limited extent with the concentration of sodium sulphate present. Precipitation is more efficient at 25° C than at higher temperatures. The effects of varying the carbonate, uranium, sulphate and sodium hydroxide concentrations, and the temperature are discussed in this paper. The reaction is considered to be represented by the equation:
U3Og
NaOH
NazSO4
2 Na4 UO2(CO3)3 + 6 NaOH<->Na2U2O7+ 6NazCO3+3 H2O
NazCO3
Temp.
The equilibrium constant has been approximately determined as: where y = activity coefficient as in Table 1, and ( ) denotes molar concentrations. A working curve has been drawn to show the relationship between U3O8 gm/litre and the ratio (NaOH gm/1) / (Na2C03 gm/1) at various temperatures.
GEOSCAN ID327616

 
Date modified: