At present in especially Cement Plants in India relatively accurate analysis of volatiles viz Na2O, K2O, Cl and SO3 in hot meal is a necessity considering that most of the Plants are using Petcoke as fuel at percentages which are either economically attractive (optimum fuel cost ) or at levels which are felt to be technically feasible by the Plant . Another aspect is co-processing of industrial wastes which could be liquids , solids , sludges ,agricultural wastes etc . Both these aspects invariably results in formation of undesired build ups at riser ducts and kiln inlets , cyclone jamming etc , causing periodic stoppages for cleaning . .
This necessitates monitoring of hot meal for volatiles ( Na2O, K2O, Cl and SO3 ) , in many cement plants Hot meal samples collected with different contents of volatiles are collected , analysed with facility in the plant and used as XRF stds to calibrate XRF for hot meal analysis . As these samples are partly calcined the samples gain LOI and their analysis alters and so the results are erroneous , and more frequently same volatiles need to be also analysed convebtionally in the plant labs .
Enclosing procedure for preparation of XRF stds for Hot meal analysis . The wts of the different components : Plant kiln feed . Clinker , NaCl , K2SO4 and gypsum anhydrite are given to get different levels of the Na2O, K2O,Cl and SO3 in different samples which should cover range of volatiles of hot meal observed for the Plant . Use Pure AR grade NaCl , K2SO4 . The gypsum anhydrite can be made from pure Gypsum by heating its powder in furnace at 400 deg C for 1 Hr . These samples would have similar matrix as the actual Hot Meal samples and can be kept without any major gain in LOI as there is no calcined component