If the density of CuO in ore ρ = 0.03It is leached with H2SO4 = 0.5MOre particle have radius r=0.5Effective diffusivity De= 6*10-6Molecular weight Mb=79.6 B=0.5Cab=0.01Calculate the time required for total leaching.

If the density of CuO in ore ρ = 0.03It is leached with H2SO4 = 0.5M

1.	If the density of CuO in ore ρ = 0.03It is leached with H2SO4 = 0.5MOre particle have radius r=0.5Effective diffusivity De= 6*10-6Molecular weight Mb=79.6 B=0.5Cab=0.01Calculate the time required for total leaching.
A.	2.1h
B.	2.28h
C.	7.8h
D.	6.4h
Answer» C. 7.8h

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