Disclosed is a process for burning cattle dung at a temperature of from 500 DEG to 780 DEG C., preferably from 650 DEG to 780 DEG C., in the presence of one or more aluminum-containing substances selected from the class consisting of bauxite, kaolin and aluminum compound-containing ash from furnaces for firing solid fuels. A major part of the alkalies contained in the cattle dung and a substantial part of the chlorine are retained in combined form in the resulting furnace ash.
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