1.Production scale: 10, 000--200, 000 mt/year 2.Raw material: Content of caso4. 1/2 h2o in gypsum mine 80% The grade of mine and the crystal configuration will influence the quality of semi-hydrated gypsum 3, working principle The main working principle for calcining system, of calciner The main body of calciner consists of fine diameter intensive radiator pipes. Thermal oil fed into the coil pipes. The heat releases into power by heat exchanger. Roots blow installed at bottom of calciner for putting the cooling air into furnace by grid plate. The cooling air blows gypsum power in furnace for reaching boiling state. At certain temperature , the calcined gypsum power will lighten, and flow automatically to outlet. This type gypsum power is state in quality. It is easier to control the content of free water , initial and final setting times. Moreover, our equipments adopt dry electric precipitator, dust collection efficiency is over 95%. 4, simple structure, durable equipment The boiler does not need rotary components because the materials has come true fluidization. It simplifies the structure, manufacture and maintenance. In any case, the furnace will not damage since it uses low-temperature heat source. The life span is much longer than normal type. 5, compact, space saving Calciner is a kind of vertical equipment. The dust collector installed on the top of it as whole body. This design is good at space saving, and avoids moisture condensation on corona lines of dust collector.