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Question 4 (a) In the processing of particulate solids, there are circumstances under which inter-particle and particle-wall impacts cause damage to the particles. Identify and quantify the conditions under which particulate solids are damaged. (6 marks) (b) Evaluate the energy required to crush the average size of organic and inorganic particles in Table 3 from 0.17 mm to 0.02 mm using Rittinger, Kick and Bond Law. Justify the lowest energy requirement. Table 3 Particle Energy (kJ/kg) Initial size (mm) Final size (mm) 0.83 126.9 1.96 Organic Inorganic 792.2 4.81 1.31 (7 marks)