Field Measurement of Slow Metamorphic Reaction Rates at Temperatures of 500° to 600°C

Science ◽  
2000 ◽  
Vol 288 (5470) ◽  
pp. 1411-1414 ◽  
Author(s):  
E. F. Baxter
Keyword(s):  
Field Measurement ◽  
Reaction Rates ◽  
Metamorphic Reaction

Metamorphic reaction rates at ∼650–800°C from diffusion of niobium in rutile

2014 ◽  
Vol 130 ◽  
pp. 63-77 ◽  
Author(s):  
Alicia M. Cruz-Uribe ◽  
Maureen D. Feineman ◽  
Thomas Zack ◽  
Matthias Barth
Keyword(s):  
Reaction Rates ◽  
Metamorphic Reaction

SEM analysis of the change in the reaction rates with deposit structures in the copper-iron cementation system

1978 ◽  
Vol 36 (1) ◽  
pp. 456-457
Author(s):  
V. Annamalai ◽  
L.E. Murr
Keyword(s):  
Structural Characteristics ◽  
Secondary Electron Emission ◽  
Copper Deposit ◽  
Reaction Rates ◽  
Sem Analysis ◽  
Experimental Conditions ◽  
Major Drawback ◽  
Emission Mode ◽  
Scrap Iron ◽  
Image Position

Economical recovery of copper metal from leach liquors has been carried out by the simple process of cementing copper onto a suitable substrate metal, such as scrap-iron, since the 16th century. The process has, however, a major drawback of consuming more iron than stoichiometrically needed by the reaction.Therefore, many research groups started looking into the process more closely. Though it is accepted that the structural characteristics of the resultant copper deposit cause changes in reaction rates for various experimental conditions, not many systems have been systematically investigated. This paper examines the deposit structures and the kinetic data, and explains the correlations between them.A simple cementation cell along with rotating discs of pure iron (99.9%) were employed in this study to obtain the kinetic results The resultant copper deposits were studied in a Hitachi Perkin-Elmer HHS-2R scanning electron microscope operated at 25kV in the secondary electron emission mode.

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