神岡・鹿間選鉱工場における閉回路粉砕のシミュレーション

抄録

Through analysis of the data obtained from the plant test in the Kamioka-Shikama concentrator, which includes a 2, 700mm dia.×3, 600mm length rod mill and a 3, 900mm dia.×5, 700mm length ball mill in a closed circuit with 2 or 3 hydrocyclones of 600mm in diameter, a comminution mathematical model has been deduced from making use of a selection function under the assumption of plug flow material transport. ln the rod mill, the said selection function “s (x) =Kx” is 1.871×10^-4x^0.7151 (s^-1) and that in the ball mill is 1, 179×10^-5x^0.9891 (s^-1).
As a cyclone classification-model, the logarithmic cumulative normal distribution function has been found to give a best fit to the true partition curve. Several regression equations for the prediction of the fraction of water β, separation size D₅₀, and the sharpness of σ separation a have been made up as the functions of the feed to the cyclone. Combining the mill models with those regression classification models, many simulations have been carried out to find out the most accurate cyclone model to be applied for simulating the real operation.
Making use of the optimum models, the comminution in the mills and classification in the cyclones have been simulated in a wide range of operating conditions to obtain information on the conditions of the plant. The results of the simulations indicate that it is possible to gain higher throughput in the mill-cyclone circuit without changing the characteristics of the cyclone overflow (i. e. the feed to the flotation circuit).