Peculiarities of Firing Porous Clay Products With Burning Out Additive

The paper considers the problems associated with firing of porous clay masonry units with large amounts of burning out additive. One of the major problems is the reduction of the pyrolysis products and CO in burnt gases as well as reducing density of the product. To solve the above problems, tests aimed at comparing the behaviour of various clay mixture in burning and determining the amounts of the released gases during this process were made. The use of expanded polystyrene was found to be most effective for reducing the weight of ceramic body. Based on the data obtained, the amount of the released CO per unit weight of the introduced burning out additive was calculated. When expanded polystyrene was added, the release of CO per one gram of the material was the highest; however, an absolute emission value was the smallest.