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However, the nature of the process involved in shaft kiln agglomeration makes it subject to numerous disadvantages from a practical viewpoint; namely, difficulties in charging pellets uniformly over the shaft kiln cross section without segregation and breakage of pellets; difficulty in obtaining uniform rates of upward gas flow over all of the cross sectional area of the kiln because of fusion of a quantity of pellets into a gas-impervious mass; irregular and difficult-to-control sliding and hanging of the charge in the kiln; and formation of overburned dense chunks of fused pellets

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