Natural gypsum calcination kiln, gypsum rotary kiln, gypsum calciner

Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It can be used as a fertilizer, is the main constituent in many forms of plaster and in blackboard chalk, and is widely mined. A massive fine-grained white or lightly tinted variety of gypsum, called alabaster, has been used for sculpture.

Raw material can be natural gypsum or flue gas desulphurization gypsum.

Main Technology(Nature gypsum rock)
Gypsum mine - crushing - grinding - calcining - aging -finished products (plaster of paris)

2.1.1 Crushing, Grinding Section
The forklift driver removes the gypsum ore from the quarry into the hopper in front of the crusher, and then the gypsum ore is crushed into the 20mm materials, which are later sent to the mill by the hoist to be grinded into qualified gypsum powder (raw gypsum).

2.1.2 Calcining Section
The grinded gypsum powder is lifted into gypsum calcining machine for calcination. The calcining machine uses gas heat conduction oil furnace, however, other fuels like coal, methane, LPG, diesel oil, heavy oil, etc. can also be used. Due to its low temperature, slow burning calcining mode, the stability of gypsum quality is well ensured.

2.1.3 Finished Product Packing and Storing Section
Calcined gypsum powder is lifted into the finished product silo through a hoist, where an automatic weighing and packaging machine is used to pack 50kg gypsum powder per bag for marketing or storing.

Rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process. 

Materials produced using rotary kilns include:cement, lime, refractories, metakaolin,titanium dioxide,alumina,vermiculite,iron

ore pellets, zinc oxide,gypsum, etc.

Gypsum rotary kiln structure:

Gypsum rotary kiln is composed of cylinder, gears, support device, kiln liner and kiln tail sealing equipment, kiln head hood and

combustion.

Working principle of gypsum rotary kiln:

The rotary kiln is a cylindrical vessel, inclined slightly to the horizontal, which is rotated slowly about its axis. The material to be 

processed is fed into the upper end of the cylinder. As the kiln rotates, material gradually moves down towards the lower end, 

and may undergo a certain amount of stirring and mixing. Hot gases pass along the kiln, sometimes in the same direction as 

the process material (co-current), but usually in the opposite direction (counter-current). 

Application of gypsum:

Gypsum board is primarily used as a finish for walls and ceilings, and is known in construction as drywall, sheetrock or plasterboard.

Gypsum blocks are used like concrete blocks in building construction.

Gypsum mortar is an ancient mortar used in building construction. Plaster ingredients are used in surgical splints, casting moulds and modeling.