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When incinerating and recovering the heat from waste liquors containing inorganic salts, a great amount of inorganic salts usually will be entrained in the flue gases from the general spray combustion systems which will tend to come in contact with the heating tube surface and solidify. As a consequence the efficiency of the heat exchange will decrease rapidly over a short period of time. This makes heat recovery very difficult. We studied a new combustion method for collecting the inorganic salts in the incinerator to avoid this problem. In our study, we found the suitable temperature to restrain the volatilizing of salts and to recover the melted salts, and a wall combustion system effective in restraining the entrainment of salts. Using this principle, we made a prototype cyclone waste liquor incinerator and conducted combustion experiments using several kinds of factory-waste liquors. As a result, it was possible to recover more than 97 % of the inorganic salts in the incinerator. The amount of salts coming on contact with the heat recovery tube was reduced by less than to 1/30 in comparison to the spray combustion system, making it possible to recover heat from the flue gases.