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Help CenterRotary Kiln for Silica Sand Processing 500 Tpd
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1. Introduction
The 500 TPD (Tons Per Day) Rotary Kiln for Silica Sand Processing is a high-capacity, precision-engineered industrial thermal system designed for the drying, calcination, and high-temperature purification of quartz and silica sands. Delivering a robust daily output of 500 tons, this system is a critical manufacturing link for the high-end glassmaker, foundry, ceramics, electronics (semiconductor-grade quartz), and hydraulic fracturing (proppant) industries. Its primary function is to subject raw silica sand to uniform, intense thermal treatment—driving off deep-seated moisture, destroying organic contaminants, and triggering precise phase transformations to produce ultra-pure, high-strength silica sand.
2. Working Principle
The processing of silica sand within the rotary kiln utilizes a continuous thermal method based on an optimized counter-current or parallel heat flow design to ensure strict particle temperature control. The system operates through the following sequential stages:
Material Feeding: Wet or washed raw silica sand is continuously and uniformly metered into the kiln tail (the elevated, cooler end of the slightly inclined, slowly rotating cylinder).
Drying and Preheating: As the kiln rotates, a dense arrangement of internal, abrasion-resistant lifting flights cascades the sand through the hot air stream. This dynamic action maximizes the contact surface area, rapidly evaporating surface moisture and preheating the sand grains.
High-Temperature Processing & Calcination: The material transitions into the main thermal zone, where temperatures are strictly regulated (often between $800^\circ\text{C}$ and $1200^\circ\text{C}$ depending on the target application). This intense heat burns off any remaining organic impurities, reduces iron oxide staining on the sand surfaces, and achieves the required crystalline phase modifications (such as converting alpha-quartz to beta-quartz) without melting the grains.
Cooling & Product Discharge: The hot, processed silica sand discharges from the kiln head directly into a rotary or fluidized bed cooler. High-efficiency air cooling rapidly lowers the sand’s temperature to safe handling levels, while capturing the ambient heat to recycle it back into the kiln as preheated combustion air.
3. Advantages
Superior Product Purity and Whiteness: The continuous tumbling action ensures that every silica grain receives identical thermal exposure. This thoroughly eradicates organic carbon and reduces lattice-bound impurities, resulting in highly consistent quartz sand with enhanced chemical purity and excellent optical whiteness.
High-Throughput Wear-Resistant Engineering: Handling 500 tons of highly abrasive silica sand daily requires extreme durability. This kiln is built with thickened, high-tensile steel shells and lined with specialized, anti-abrasive, high-alumina refractory bricks to minimize wear and guarantee long-term operational uptime.
Strict Grain Integrity and Low Degradation: The internal flight configuration is custom-engineered to lift and slide the sand gently rather than dropping it violently. This preserves the grain shape and size distribution, minimizing the creation of unwanted fine dust and maximizing the yield of premium-grade fractured or foundry sand.
Highly Efficient Heat Loop Design: By ducting high-temperature exhaust from the kiln tail into an integrated pre-drying flash system and using secondary air from the cooler, the system achieves remarkable fuel economy—drastically cutting the consumption of natural gas, diesel, or heavy oil.
Advanced Dust Mitigation for Zero Product Waste: Silica fines pose strict environmental and health hazards. The kiln integrates heavy-duty, flexible fish-scale mechanical seals at both ends, backed by a high-efficiency pulse-jet bag filter system. This setup ensures a $99.9\%$ dust capture rate, guaranteeing a clean workspace and zero material waste.
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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