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1. Introduction
The 300 TPD (Tons Per Day) Rotary Kiln for Mini Cement Plants is a compact, high-efficiency pyro-processing system tailored specifically for small-to-medium-scale or localized cement manufacturing operations. Delivering a dedicated daily output of 300 tons, this system provides independent mineral processors, regional construction groups, or niche cement producers with a highly viable alternative to capital-intensive, mega-scale cement facilities. Its primary function is to subject a homogenized mix of raw cement materials (limestone, clay, and iron correctives) to precise, high-temperature thermal treatment—driving off carbon dioxide and fusing the minerals into premium-grade cement clinker.
2. Working Principle
The production of clinker within a mini cement plant's rotary kiln utilizes a continuous, optimized counter-current or parallel heat design to ensure complete thermal efficiency in a compact footprint. The system operates through the following sequential stages:
Material Feeding: Homogenized raw meal or nodulized raw mix is continuously and uniformly metered into the kiln tail (the elevated, cooler end of the slightly inclined, slowly rotating steel cylinder).
Preheating and Decarbonization: As the kiln rotates, internal lifting flights or refractory lifters cascade the raw mix through the hot flue gases. Surface and structural moisture are rapidly driven off, and the material begins its pre-calcination phase as temperatures climb.
High-Temperature Clinkering: The material rolls downward into the main burning zone at the kiln head, where a precision multi-fuel burner drives temperatures up to $1350^\circ\text{C} - 1450^\circ\text{C}$. This intense thermal zone triggers partial melting and the critical solid-state chemical reactions required to fuse calcium oxide with silicates, synthesizing high-strength clinker minerals (Alite and Belite).
Cooling & Product Discharge: The red-hot clinker nodules drop from the kiln head into a compact rotary or grate cooler. Forced air streams rapidly quench the clinker to preserve its reactive crystal structure, while the heated ambient air is routed back into the kiln as preheated secondary combustion air.
3. Advantages
Optimized Capital Investment & High ROI: The 300 TPD configuration is engineered specifically to reduce initial capital expenditure (CAPEX) for mini cement plants. It allows operators to establish localized production closer to raw material quarries or target markets, drastically cutting logistics costs and accelerating return on investment.
Outstanding Operational Flexibility: Unlike massive kilns that must run continuously at full capacity to remain profitable, this 300 TPD system offers excellent startup, shutdown, and adjustment flexibility. It is ideal for regional markets with fluctuating demand or for producing specialized, custom batches of cement (such as white cement or sulfate-resistant varieties).
Precise Quality Control in a Compact Design: The continuous, dynamic tumbling action ensures that every raw meal node experiences identical thermal conditions. This guarantees uniform calcination, eliminating the risk of under-calcined free lime cores and yielding clinker with highly consistent mineral profiles and excellent grindability.
High-Efficiency Heat Recovery Loop: Despite its smaller footprint, the system incorporates advanced waste heat integration. High-temperature exhaust gas from the kiln tail can be ducted to raw material pre-drying systems, and recycled cooling air feeds the primary burner, lowering overall fuel consumption (natural gas, coal, or diesel) by up to $15\% - 20\%$.
Robust, Low-Maintenance Engineering: Built for continuous 24/7 reliability, the kiln is constructed from high-tensile steel plates and lined with premium, wear-resistant refractory bricks. It features heavy-duty mechanical fish-scale seals at both ends, backed by a high-efficiency pulse-jet baghouse to guarantee dust-free, environmentally compliant production.
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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