Baranova A. Obtaining of a high strength gypsum binder in turbulent flow under increased pressure

Object is a dehydration process in which we obtain gypsum binding alpha-form material with increased durability and homogeneity; the main purpose is to obtain gypsum binding alpha -form material with increased durability and homogeneity by high-speed firing of gypsum raw material in the turbulent flow of heat carrier by increased pressure, searching the structure formation process, construction and technical properties; methods are analytical, numerical, experimental design and statistics; the novelty is in obtaining gypsum binding alpha -form material with increased durability and homogeneity in two-phase technology by the heat treatment of fine-dispersed gypsum stone in a turbulent flow of gaseous heat carrier at the first stage and the process of leveling the field of temperature and chemical composition particles of gypsum in the malleabelizing chamber at the second stage. The changes of gypsum modified composition in a cone-shaped reactor by increased pressure and formation of multiphase structure of the material are researched. The rational dimensions of gypsum raw material burnt particles, time and temperature of heat treatment are assigned and conditions of obtaining the gypsum binding alpha -form homogeneous structure by soluble anhydrite hydration and residual dihydrate gypsum dehydration in the malleabelizing chamber at the expense of temperature redistribution in the burned material particles are suggested. The result of this work is a method of obtaining gypsum binding alpha -form material, in which the changes of gypsum modified composition on the first and second stages of heat treatment realize. Dependences of temperature changes and gypsum chemical composition in the reactor and the malleabelizing chamber are received, the parameters of cone-shaped reactor on the first stage of gypsum heat treatment in a turbulent two-phase flow are grounded and theoretical base for creation reactor on the second stage of gypsum heat treatment (malleabelizing chamber) are developed to provide homogeneity of the chemical composition of gypsum binding alpha -form material. The mathematical models of motion of gypsum particles in the individual equipment elements are developed for heat treatment in order to obtaining the gypsum binding alpha -form material; sphere of application is a gypsum production.