only 10 and 12

10. In 1952 , Bond proposed the following semiempirical equation for the work of grinding: W=10Wi(L21L11) where W is the specific work input (kWh per ton of ore), Wi is the Bond work index ( kWh per ton of ore), and the particle sizes are given in microns. Values of the work index have bean measured and tabulated for many materials. (a) How is Bond's equation related to Equation (2.16) above? (b) Compute the work required to grind the ore for the power plant described in Problem 8 above. Assume a starting particle size of 5cm and a final size of 100 microns. Also assume that the material has a Bond work index of 17kWh/ tonne. 11. According to Section 2.6, acid leaching is not suitable for ores containing high levels of CaCO3 or MgCO3 because these carbonates react with the acid. Write the main reactions that may occur when these carbonates are treated with sulfuric acid. 12. According to Section 2.6, hydrogen peroxide H2O2 has been used to oxidize uranium (IV) to uranium (VI). Write a balanced equation for the oxidation of UO2 to UO3 by hydrogen peroxide