Crusher breaks up large sized gypsum ore to small granule less 25mm. And then, separators mill the granule to powder with required fitness and deliver to boiling furnace to calcine. The calcined gypsum powder is delivered to grog bin for saving or to production workshop for producing.

1) Principle of work

The main part of boiling furnace is composed of thin and dense radiator pipes, which is filled with conduction oil to release the heat to the inside of the furnace. Equipped at the bottom of the furnace, the Roots blower makes the powder inside the furnace into the boiled state. The powder material baked and dehydrated with crystallization water at certain temperature, flows out through the outlet automatically. The gypsum powder produced by this procedure has stable quality and well controlled crystallization water rate, initial and final set time. Further more, by using dry electrostatic cleaner, the equipment has over 95% dust collection efficiency and eliminate the dust pollution..

2)Simple and sustainable structure

Owing to the fluidization of material, furnace doesn't have rotatable component so that it's easy to be built and almost free of maintenance. Thanks to the low temperature heat source, the furnace won't be damaged by over heating and has longer operating life.

3) Compact design and less space requirement

With vertical arrangement, the dust catcher on the top of the furnace body is integrated with the boiling furnace compactly. The system occupies less space and avoids condensation of the dust catcher.

4) Low energy consumption:

The heat energy, passed from the heat source to the material, is almost all used for material's dehydration, except a small part is used to heat the cold air blew from the bottom of the heating furnace and radiates from the furnace body. Since the boiling furnace uses twice heat source, the final heat efficiency should count in the boiler’s. As we all know, the steam boilers or hot oil boilers are mature thermal equipments and their efficiency is comparability high. The steam boiler’s efficiency can reach 60-70% and the hot oil boiler’s can reach 70-80%. (Our company uses organic heat carrier hot oil boiler.) With steam, it can reach 57-67%. With hot oil, it can reach 67-76%.

5) Good quality, ideal composition of plaster of paris, stable physical property. Due to the low temperature heat source, the plaster does not tend to be over calcined. By controlling the discharge temperature properly, the system can produce finished products without dehydrate gypsum and with less than 5% anhydrite, and hemihydrates gypsum as all others. This composition is very ideal and with stable physical property.