Overview
The Yunxi Shaking Table, developed by Yunnan Tin Group, is a gravity concentrator designed for fine-particle ore separation. It leverages differential settling rates of minerals under rhythmic shaking and water flow. Originally optimized for tin ore processing, its applications now extend to tungsten, gold, and rare earth beneficiation. The equipment is favored for its high recovery rate (typically 60–90% for target metals) and low operational costs compared to flotation methods. Modern versions feature modular designs, allowing customization of deck materials (fiberglass for corrosive ores, wooden decks for traditional applications). Its reliability in small-scale mining and secondary recovery systems has made it a staple in mineral-rich regions like Southeast Asia and Africa.
Structure and Working Principle
A Yunxi Shaking Table consists of a slightly inclined deck (1–5° adjustable) mounted on a vibratory mechanism. The deck is riffled to trap heavier particles while lighter materials are washed away by water flow. An eccentric crank generates a reciprocating motion (240–360 strokes/minute), creating a shear force that separates particles by density. The separation efficiency depends on three adjustable parameters: stroke length (10–25 mm), frequency, and deck tilt. Feed slurry enters from the upper corner, with heavy minerals (e.g., cassiterite) accumulating near the discharge end, while gangue flows off the opposite side. Advanced models incorporate automatic control systems to optimize these parameters in real-time.
Key Features
1. **Adjustability**: Stroke length and frequency can be fine-tuned for different ore densities, enabling precise grade control. 2. **Low Energy Use**: Typically consumes 0.5–1.5 kW, significantly less than centrifugal concentrators. 3. **Durability**: Steel frames with anti-corrosion coatings extend service life in humid environments. Unique to Yunxi models is the 'lobed' deck design, which enhances particle stratification. Some variants include a secondary scavenger deck for tailings reprocessing, boosting overall recovery rates by 5–15%. Noise levels are kept below 75 dB, complying with most industrial standards.
Application Areas
Primary applications include: 1. **Tin Ore Processing**: Achieves up to 85% Sn recovery from 0.037–2 mm particles. 2. **Gold Tailings Reprocessing**: Recovers fine gold (50–300 µm) missed by sluices. 3. **Tungsten/Columbite Concentration**: Effective for high-density oxides in pegmatites. Beyond mining, modified shaking tables are used in e-waste recycling to separate metals from plastics, and in soil remediation for heavy metal removal. Portable units are deployed in artisanal mining due to their simplicity and lack of chemical requirements.
Maintenance and Precautions
Routine maintenance includes: 1. **Lubrication**: Monthly greasing of bearings and drive linkages. 2. **Deck Inspection**: Check for wear or warping every 500 operating hours. 3. **Water Distribution**: Clean spray nozzles weekly to ensure even flow. Critical precautions: Avoid overloading (max feed density ~25% solids), and balance feed rates to prevent 'crowding' of heavy minerals. In freezing conditions, drain water lines to prevent cracking. For corrosive ores, rinse decks post-operation to prolong material life.
B2B Procurement Guide
When sourcing Yunxi Shaking Tables: 1. **Verify Certifications**: Look for ISO 9001 and mining safety compliance. 2. **Request Test Reports**: Reputable suppliers provide ore-specific performance data. 3. **Consider After-Sales**: Ensure availability of spare parts (e.g., decks, drive belts). Bulk buyers (10+ units) can negotiate 5–15% discounts. Lead times average 4–8 weeks for custom configurations. For international shipments, opt for containerized models (standard 20' or 40' HQ) to minimize damage risk. Third-party inspection (e.g., SGS) is recommended for large orders.
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