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Product Description
With over 15 years of deep expertise in the mineral drying sector, we are a core supplier of professional drying solutions for the high-purity quartz sand processing industry. We focus on serving downstream enterprises with extreme purity mandates, including photovoltaic-grade quartz sand, semiconductor-grade silicon materials, optical glass, and high-end precision casting.
Our processing capacities comprehensively cover a wide range from 5 TPH to 100 TPH, offering perfectly matched, optimal configurations for both thousand-ton precision processing lines and ten-thousand-ton centralized production bases. We are an authentic manufacturing factory with our own production base—definitely not a middleman or trading company. We independently manage the entire process, from initial scheme design and component machining to complete machine assembly and factory testing. To guarantee absolute reliability, every single piece of equipment undergoes a rigorous 72-hour continuous full-load test run before shipment.
High-purity quartz sand and conventional quartz sand are entirely different classes of material. While conventional sand is primarily prone to wear, high-purity sand is vulnerable to everything—metal contamination, dust infiltration, static dust attraction, temperature-induced crystal phase transitions, and final moisture bounce-back. With $\text{SiO}_2$ purity requirements starting at 99.5% and scaling up to 99.99% for high-end applications, a failure at any single stage results in the immediate scrapping of the entire batch. It is no longer a question of whether a drying system is functional, but whether it is qualified to handle such premium material.
Our specialty rotary dryer for high-purity quartz sand is engineered precisely to counter these extreme industry pain points:
Cleanroom-Grade Sealing completely eradicates external contaminant infiltration.
An Anti-Static Lifting System eliminates the risk of electrostatic dust attraction.
Low-Temperature, Extended-Residence Drying locks in zero crystal phase transitions.
To date, we have delivered a vast number of stable drying production lines to major high-purity quartz sand hubs across China (including Donghai in Jiangsu, Zhanjiang in Guangdong, Hezhou in Guangxi, and Chenzhou in Hunan) while actively serving international high-purity material clients in Southeast Asia, Japan, South Korea, and Europe. Our customer reorder rate and satisfaction levels consistently remain exceptionally high.
If you are looking for a reliable partner that truly understands high-purity material drying—from technical selection and customized scheme design to equipment manufacturing, installation guidance, and lifetime after-sales maintenance—we are your ideal choice. We support on-site factory inspections, OEM/ODM customization, and worldwide shipping.
Functional Principle
The core of the equipment is a slightly inclined, slowly rotating steel drum. Crucially, the inner walls of the drum and all components that come into direct contact with the material are lined or constructed with high-purity alumina ceramics or silicon carbide. Wet high-purity quartz sand is uniformly introduced through an enclosed feeding system into the elevated inlet. As the drum rotates at a low speed, internal ceramic lifting flights repeatedly lift and shower the sand particles, forming a highly uniform material curtain that comes into full contact with multi-stage filtered, ultra-clean hot air.
The hot air is delivered in a counter-current layout from the discharge end toward the feed end. This layout maximizes heat exchange efficiency while preventing high-temperature hot air from directly striking the wet sand at the inlet, which can cause surface case-hardening. The dried high-purity quartz sand is discharged from the lower end via an airtight discharge valve, while the high-temperature, humid exhaust gas is drawn out from the top end to be processed by the dust collection system before eco-friendly emission.
The interior of the drum naturally creates three functional temperature zones along the material path:
Heating Zone (Inlet End): The material gradually absorbs heat, gently raising its temperature from ambient to 100°C to 150°C. High-purity quartz sand is exceptionally sensitive to thermal shock; this zone uniformly preheats the sand grains to prevent surface micro-cracking caused by excessive temperature deltas. Simultaneously, it strips away surface free water, setting the stage for deep drying.
Core Drying Zone (Middle Section): Temperatures here are strictly controlled between 200°C and 350°C, making this the primary zone for rapid dehydration. We utilize a low-temperature, extended-residence drying profile rather than high-temperature flash drying. Although the single-pass residence time is slightly longer, it provides maximum protection to prevent the irreversible transition of the $\beta$-quartz crystal phase.
Cooling Zone (Outlet End): A filtered stream of low-temperature, clean air cools the dried quartz sand to below 50°C before discharge. High-purity quartz sand is highly hygroscopic at elevated temperatures; if it enters a storage silo directly without sufficient cooling, the final moisture content will rapidly bounce back. Cooling the output precisely locks the moisture within target parameters while eliminating safety hazards during high-temperature material conveying.
Drive & Thermal Systems
The heat source is equipped with a versatile multi-fuel combustion system supporting natural gas, diesel, heavy oil, electrical heating, and biomass pellets. For high-purity quartz sand applications, we strongly recommend natural gas or electrical heating. These two heat sources introduce zero combustion byproducts, natively aligning with the cleanliness requirements of high-purity materials. We can also design direct waste heat integration schemes; if your facility has clean waste heat resources, operational costs can be slashed by an additional 30% or more.
The drive system utilizes a variable frequency drive (VFD) motor paired with a hard-tooth surface gear reducer, allowing the drum speed to be steplessly adjusted between 1.5 to 5 rpm. Because high-purity quartz sand features high density and excellent fluidity, the rotational speed is configured lower than that of conventional sand dryers to minimize inter-particle friction. The system automatically adapts to the feed volume to maintain an optimal balance between capacity and energy consumption. Furthermore, the transmission system features built-in torque monitoring and overload protection to automatically slow down and trigger an alarm if an abnormal material distribution occurs.
Exhaust Treatment
High-purity quartz sand drying demands strict exhaust cleanliness—the discharged gas must not contain any particulate matter that could settle back into the product line. Our exhaust treatment uses a three-stage purification sequence: a cyclone dust collector first intercepts large particles and coarse sand, followed by a baghouse dust collector that captures fine particulates, keeping final emission concentrations strictly under 15 mg/m³. For semiconductor and photovoltaic-grade clients, an extra HEPA filtration unit can be integrated to achieve near-zero emissions. The recovered fine sand can be remixed back into the finished product after magnetic iron separation.
Core Features
1. Cleanroom-Grade Sealing to Block External Contamination
High-purity quartz sand is highly vulnerable to both internal wear and external environmental intrusion. Ambient workshop dust, airborne iron particulates, or impurities introduced by operators can instantly downgrade a 99.9% pure product to 99.5%. To prevent this, our equipment features a fully sealed, negative-pressure structure. The inlet, outlet, and maintenance hatches are all equipped with airlock sealing devices, maintaining a continuous micro-negative pressure inside the drum. External air must pass through three stages of filtration to enter. This design effectively transforms your drying chamber into an isolated clean space, ensuring product integrity regardless of external environmental conditions.
2. Anti-Static Lifting System to Eradicate Dust Attraction
High-purity quartz sand generates significant static electricity during the drying process. These charged sand grains actively attract microscopic dust from the air, creating an invisible but critical source of contamination. Our lifting flights are embedded with conductive ceramic tiles paired with grounding copper strips along the drum shell to discharge friction-induced static in real time. The resulting dried sand remains completely uncharged and dust-free, significantly upgrading final product purity.
3. Low-Temperature, Extended-Residence Profile for Zero-Risk Yields
Most industrial sand dryers chase high-temperature flash drying, completing the cycle within 30 minutes. However, for high-purity quartz sand, excessive heat is catastrophic—triggering crystal phase transitions that ruin the material. We utilize a low-temperature, extended-residence process that strictly locks the core drying zone below 350°C, compensating for the lower single-pass dehydration intensity by extending the material's residence time within the drum. This ensures zero crystal phase transitions and zero purity loss while meeting strict final moisture targets.
4. Real-Time Online Moisture Monitoring Eliminates Guesswork
We install an online Near-Infrared (NIR) moisture analyzer at the discharge end to continuously monitor the moisture content of the dried quartz sand, feeding data directly back to the PLC system. If moisture trends high, the heat source output automatically scales up; once the target is met, energy consumption steps down. The final moisture can be configured anywhere between 0.05% and 0.3% with a control accuracy of ±0.02%, locking in moisture targets automatically without manual sampling.
5. Nitrogen-Blanketed Drying Option for Ultra-High Purity Grades
For semiconductor-grade clients requiring $\text{SiO}_2$ purity levels exceeding 99.99%, we offer an optional specialized closed-loop nitrogen-blanketed drying configuration. During operation, high-purity nitrogen gas is flooded into the drum to completely displace oxygen and moisture, fundamentally eliminating any possibility of oxidation or secondary moisture re-absorption.
6. Modular Quick-Change Design to Minimize Downtime
In high-purity production lines, a single day of downtime can result in financial losses far exceeding the cost of the equipment itself. Our lifting flights, liners, and internal components feature a modular quick-release design, allowing replacements using standard wrenches and bolts without requiring welding or hot work. Common wear parts ship within 48 hours, and on-site replacement times can be kept under 4 hours, ensuring your line is protected against extended maintenance shutdowns.
Get a Custom Engineering Scheme Within 24 Hours
Please send us your initial moisture content, target final moisture, $\text{SiO}_2$ purity requirements, daily capacity needs, available fuel types, and site dimensions. We will deliver a comprehensive technical proposal and quotation within 24 hours. Factory direct supply with zero middleman markups—contact us today to schedule an on-site factory visit!
Technical Specifications
| Product Specs (m) | Capacity (T/H) | Main Motor Power (kW) | Main Motor Model | Main Gearbox Model | Ratio |
| φ1.2×10m | 2.5 | 7.5 | Y160M-R3 | ZL50-16-1 | - |
| φ1.5×12m | 3.3 - 4.9 | 10 | Y160L-6B3 | JZQ500-III-2F | - |
| φ1.5×15m | 4 - 6 | 18.5 | Y200L-6 | JZQ500-III-2F | - |
| φ1.8×12m | 4 - 6 | 11 | Y200L-6 | ZQ50-16II-2 | 16.46 |
| φ2.2×12m | 7 - 12 | 18.5 | Y160L-6 | JZQ650-III | 31.5 |
| φ2.2×14m | 7 - 12 | 18.5 | Y160L-6 | JZQ750-III | 31.5 |
| φ2.2×16m | 12 | 30 | Y225M-6 | JZQ750-III | 31.5 |
| φ2.4×14m | 12 | 30 | Y250M-6 | JZQ750-III | 31.5 |
| φ2.4×18m | 10 - 13 | 37 | Y250M-6 | ZL85-13-1 | 27.16 |
| φ2.4×20m | 10 - 14 | 37 | Y250M-6 | ZL85-13-1 | 27.16 |
| φ3×20m | 25 | 55 | Y250M-4 | ZL100-16-1 | 41.52 |
| φ3×25m | 32 - 36 | 75 | YR280M-4 | ZL100-16-1 | 41.52 |
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