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Effect of system geometry on the leaching behavior of cobalt metal: Mass transfer controlling case

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Abstract

The leaching behavior of cobalt particles in ammonia solutions has been studied. The leaching studies were carried out both in a stirred tank reactor and in a f luidized bed reactor and the results are compared with those obtained using a rotating disk geometry. Under the experimental conditions studied, the concentration difference of products between the solid /liquid interface and the bulk solution was found to be independent of the system geometry and flow dynamics. The leaching correlation obtained for cobalt particulate system was:(Sh) p = 2 + 0.65(Re) 1/2p (Sc)1/3.

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Abbreviations

A :

area of leaching substrate(L2),

Cb :

concentration of product in the bulk solution (mol L-3),

C s :

concentration of product at the surface (mol

d :

diameter of particles(L),

D′ :

diameter of fluidized bed (L),

D :

diffusion coefficient(L2 T− 1),

g :

gravitational acceleration (MT{&x2212; 2}),

j :

mass flux (ML{&x2212; 2} T{&x2212; 1}),

k :

apparent rate constant (T− 1)

k′:

mass transfer coefficient(LT− l),

M :

moles per liter (molL− 3),

Q :

volumetric flow rate (L3 T-1),

R :

radius of rotating disk(L),

V :

solution volume(L3),

V p :

slip velocity(LT− 1),

V t :

terminal velocity (LT−1),

V fs :

superficial velocity of fluid(LT− 1),

σ:

diffusion boundary layer thickness(L),

∈:

fractional volume of liquid in fluidized bed,

ρ s :

density of solid (ML −3),

ρf :

density of fluid (ML −3),

v :

kinematic viscosity of fluid (L2T{−1}),

ω:

angular velocity of rotating disk (radT− 1).

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Authors and Affiliations

  1. Department of Chemical Engineering, Monash University, 3168, Clayton, Victoria, Australia

    C. Vu (Post Graduate Student) & K. N. Han (Senior Lecturer)

Authors
  1. C. Vu
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  2. K. N. Han
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Vu, C., Han, K.N. Effect of system geometry on the leaching behavior of cobalt metal: Mass transfer controlling case. Metall Trans B 10, 57–62 (1979). https://doi.org/10.1007/BF02653972

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  • DOI: https://doi.org/10.1007/BF02653972

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