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Several models have been purposed to determine carrying rate and kinetic constant in flotation columns. Each of these models is credible under special circumstances. This is truer regarding empirical models. Another problem in respect to these models is that they produce different results compare to the outcome of the test works. Therefore, it is of a crucial importance to determine above mentioned parameters based on the
observations in order to have an accurate scale up for flotation columns. This procedure has been followed for Sarcheshmeh Temporary Molybdenite cleaning plant. The test results
were different from those obtained using empirical formula. Several reasons have been offered to explain this contradiction.