machine for plaster of paris

1. Summarization:

Crusher breaks the big sized gypsum ore into less than 25mm sized ore. After storing and measured by weight belt, it is sent onto mill to grind. After filtrated by powder concentrator, it is sent into fluidized bed furnace to calcine. Unqualified powder is sent back to mill to grind again until it becomes qualified. The qualified powder after calcined is sent to store or use.

2. The feature of calining after grinding

The advantage of the technics is that it can reduce the consume of the resources. The reason is: After the big grain of gypsum is grind, the diameter of the powder is less than 0.2mm; the surface area will be enlarged when it is calcined. In this way, the contact area between the powder and the medium. It promotes the efficiency of heat exchange. The disadvantage is that there are 3 dust pollution spots, but it can be solved by dust exhausting equipment.

3. Technique feature of fluidized bed furnace

(1) Small equipment, high productivity.

(2) Simple structure, not easy to damage.

(3) Compact equipment, little occupation of land.

(4) Low consumption of energy.

(5) Easy to operate, automatic control.

(6) Qualified products, ideal component of burnt gypsum , good physical property

(7) Low investment of capital construction, low operating cost.

4. Performance guideline of the products

Main component

Content of semi-hydrated gypsum: ≥80%

Content of gypsum dehydrate: 5%

Content of solubility anhydrite: 5%

Time of initial set: 3-8min (adjustable)

Time of final set: 6-15min (adjustable)

Normal thickness: 78-85 %( adjustable)

Two hour folding strength: ≥2.0Mpa, the grade of the gypsum is different, so the strength is different.