Combined cements with non-shrinking properties using sulfoferrite clinker

The increase of stackable waste products quantity demands taking measures is directed towards its decrease. This waste products usage in cement production which is one of the most consumptive branches of production, based on material and expenditure of energy, is one of the possible decisions. The usage of recycled resources in special sorts of cement production in contrast with its application in the Portland cement production is poorly understood and requires the increase of scientific knowledge with the purpose of total control over a technological process. The appropriate roasting conditions and whole technology ensuring is possible by careful updating and control of raw mixes. There is a potential that the most components are added the most qualitative final product will be in condition of necessary control. Two calculated modules (ferrite and sulfate) are usually used in the production, which guarantees an optimal technology of relatively clean raw materials production. The production of high-quality sulfoferrite clinker, having fair quantities of silicon oxide, is complicated since collateral compounds are formed during roast. As a result, the formation of calcium sulphate solid solution in calcium ferrite is put off until higher temperatures are reached, and after that it becomes improbable in view of both anhydrite crystals' extension and sublimation's strengthening. (paper)