Dissolution kinetics of enargite in dilute Cl2/Cl− media

摘要: Abstract A study was made of the dissolution kinetics enargite, Cu 3 AsS 4 , with chlorine generated in solution by reaction between sodium hypochlorite and hydrochloric acid. The effects stirring speed, initial concentration, particle size, temperature were investigated. characterized two sequential stages: relatively fast initially, while later became very slow. In first stage, fraction copper extracted varied linearly time according to α = k 1 t whereas second well represented shrinking core model controlled diffusion through a porous product layer kinetic equation: 1−3(1− ) 2/3 +2(1− )= 2 . S 0 acts as barrier. calculated activation energies 15.0 kJ mol −1 (3.5 kcal/mol) for stage 21.0 (5.0 second. For an apparent order 1.0 found respect concentration; 1.8 obtained.