Henan Yufeng Machinery is a professional manufacturer of rotary drum dryer. The desulfurization gypsum dryer is one of our main drying equipments. It belongs to the industry drying machine. There are two ways for processing the building gypsum: the indirect method and the direct method.

1. Indirect method (two steps of drying and calcinating) 
This method is according to the energy sources situation and the environmental protection requirements, placing the free water which is easy to dehydrate and the crystal water which is hard to dehydrate into two drying devices separately. This is more reasonable and is convenient for the structural adjustment and quality control. This kind of rotary drum drying equipment can produce dry dihydrate gypsum (cement retarder), and high-class product β gypsum.

2. Direct method (one step of drying and calcinating)
This method takes advantage of the three layers rotary drum drying technology of high heat transfer, and mass transfer. Then develop and design a set of gypsum calcination process unit. This drum dryer device can used to produce dry dihydrate gypsum (cement retarder), and semi-hydrated gypsum. The blast temperature to produce dry dihydrate gypsum is 120 ℃ which can be obtained from the low temperature smoke of the thermal power plant.

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