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Help CenterRotary Kiln for Gypsum Calcination 300 Tpd
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Precise Temperature Control
Intelligent multi-zone temperature regulation inside the kiln accurately matches the thermal curve of each calcination stage (preheating, dehydration, homogenization), effectively avoiding over-burning or under-burning, guaranteeing product sett
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Here is the professional product description for the 300 TPD Gypsum Calcination Rotary Kiln, following the exact structural framework and technical tone of your previous profiles:
1. Introduction
The 300 TPD (Tons Per Day) Rotary Kiln for Gypsum Calcination is a high-capacity, heavy-duty thermal processing system engineered for the precise dehydration and calcination of natural or chemical gypsum (such as phosphogypsum or desulfurization gypsum). With a dedicated daily output of 300 tons, this system is a cornerstone for large-scale manufacturing in the building materials, construction, and chemical industries. Its primary function is to subject raw gypsum ($CaSO_4 \cdot 2H_2O$) to controlled thermal treatment, partially removing its chemically bound crystalline water to transform it into high-strength, uniform hemihydrate gypsum ($\beta\text{-CaSO}_4 \cdot 0.5H_2O$, commonly known as Plaster of Paris).
2. Working Principle
The calcination of gypsum inside the rotary kiln is a continuous, low-to-medium temperature pyro-processing method based on an optimized parallel-flow or counter-current heat design to ensure structural phase uniformity. The system operates through the following sequential stages:
Material Feeding: Raw, crushed gypsum rock or dewatered powder is continuously metered into the kiln tail (the elevated end of the slightly inclined, slowly rotating cylinder).
Drying and Preheating: As the kiln rotates, internal lifters cascade the gypsum through the hot air stream. In the initial zone, surface moisture is rapidly evaporated, and the material is uniformly preheated to its dehydration threshold.
Controlled Calcination: The material moves downward into the main calcination zone, typically maintained at a stable temperature profile between $140^\circ\text{C}$ and $180^\circ\text{C}$. At this exact thermal range, the dihydrate gypsum releases $1.5$ molecules of its crystalline water. The dynamic tumbling action ensures that every crystal phase changes uniformly, preventing both under-calcined raw spots and over-calcined anhydrite dead spots.
Cooling & Product Discharge: The freshly calcined hemihydrate plaster drops from the kiln head into a specialized cooler or aging silo. Controlled air cooling quickly stabilizes the chemical properties of the plaster, preparing it for fine grinding, storage, or immediate plasterboard production.
3. Advantages
Optimized Phase Purity and Setting Time: Gypsum calcination is highly sensitive to temperature variations. This system features precision automatic temperature control within $\pm5^\circ\text{C}$, ensuring a phase purity of hemihydrate gypsum exceeding $85\%$. This translates to predictable, high-quality setting times and superior mechanical strength in end products.
Excellent Thermal and Fuel Efficiency: The system is engineered to capture hot exhaust gases from the kiln tail and recirculate them into a pre-drying unit or flash dryer. This integrated heat loop significantly lowers fuel consumption (whether utilizing natural gas, diesel, or pulverized coal), providing substantial daily energy savings.
Continuous Heavy-Duty Reliability: A 300 TPD configuration is built for 24/7 continuous industrial operation. Featuring high-alloy steel kiln shells, heavy-duty riding rings, and a variable frequency drive (VFD) motor, the kiln guarantees smooth torque distribution, high operational stability, and minimal maintenance downtime.
Eco-Friendly Dust and Emission Control: Because gypsum processing generates significant fine dust, the kiln features state-of-the-art, high-temperature flexible mechanical seals at both ends. Paired with a customized pulse-jet baghouse system, it achieves a $99.9\%$ particulate recovery rate, keeping operations completely dust-free and clean.
Technical parameters
Model |
Speed (r/min) |
Inclination (%) |
Capacity (t/h) |
Gearbox Model |
Ratio |
Motor Model |
Motor Power (kW) |
Motor Speed (r/min) |
Thrust Roller Type |
Support Count |
Weight (t) |
Φ1.9/1.6x36 |
0.53-1.59 |
4 |
2.5-3 |
JZQ750-1 |
48.58 |
JZT-72-4 |
30 |
1200/400 |
Mechanical |
3 |
53 |
Φ2.1/1.8x36 |
0.5-1.51 |
4 |
4 |
UT2-110 |
163.38 |
JZS-81 |
30/10 |
1410/470 |
-- |
3 |
75 |
Φ1.2x25 |
0.5-1.6 |
3 |
-- |
PM650 |
40.17 |
JZTY71-4 |
22 |
1200/120 |
-- |
3 |
34 |
Φ1.6x32 |
0.158-0.258 |
3 |
-- |
PM750 |
48.57 |
JZJY61-4 |
15 |
1200/120 |
-- |
3 |
46.82 |
Φ1.8x45 |
0.66-1.98 |
4 |
3.5 |
UT2-110 |
163.38 |
JZS-81 |
30/10 |
1410/470 |
-- |
3 |
80 |
Φ2.2x50 |
0.125-1.25 |
3.5 |
4 |
ZS145-11 |
157 |
YCT280-4A |
30 |
1320/132 |
-- |
3 |
130.7 |
Φ2.5x50 |
0.516-1.549 |
3.5 |
5.5 |
ZS165-7 |
99.96 |
YCT355-4A |
55 |
1320/440 |
-- |
3 |
167.5 |
Φ3x48 |
0.3309-3.309 |
3.5 |
35 |
ZL130-14 |
32.11 |
ZSN4-250-21B |
90 |
1000/100 |
-- |
3 |
237 |
Φ3.2x50 |
0.398-3.975 |
3.5 |
50 |
ZL130-16 |
40.85 |
ZSN4-280-11B |
190 |
1500/150 |
-- |
3 |
263 |
Φ3.3x52 |
0.391-3.91 |
3.5 |
50 |
ZSY500-28 |
27.707 |
ZSN4-315-082 |
190 |
1000/100 |
-- |
3 |
280.8 |
Φ4x60 |
0.396-3.96 |
3.5 |
104 |
ZSY630-35.5 |
34.601 |
ZSN4-355-092 |
315 |
1000/100 |
Hydraulic |
3 |
487.5 |
Φ4.2x60 |
0.4165-4.165 |
3.5 |
116 |
ZSY710-35.5 |
35.526 |
ZSN4-355-12 |
420 |
1000/100 |
-- |
3 |
576.1 |
Φ4.3x62 |
0.398-3.98 |
3.5 |
125 |
ZSY710-35.5 |
35.714 |
ZSN4-355-12 |
420 |
1000/100 |
-- |
3 |
598.5 |
Φ4.8x74 |
0.35-4 |
4 |
208 |
JH710C-SW305-40 |
42.226 |
ZSN4-400-092 |
630 |
1500/130 |
-- |
3 |
841 |
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