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Folded Inclined Screen screen vibrating screen and sluice box for alluvial gold
Foldable Inclined Sluice Screen – This is a mobile mineral processing device that combines screening and gravity separation (sluice box) with a foldable frame. It is widely used in open-pit and riverine operations of placer gold and tin mines. Its core advantages are rapid relocation, prevention of caking, and high recovery rate.
Working Principle:
* Screening and Grading: Gold-bearing/ore sands and gravels enter from the feed end. The inclined screen surface first separates large gravels and impurities; a spray system simultaneously washes away sludge.
* Gravity Separation and Enrichment: Fine ore slurry flows into a Z-shaped/long sluice box lined with padding (such as gold-adhesive grass or corrugated plates); under the action of water flow and slight agitation/vibration, heavy minerals (gold, tin, etc.) settle and remain, while light ore sludge and tailings are carried away by the water flow.
Foldable Structure: The screen body, sluice box, and support can be folded in half or in sections, requiring minimal disassembly and significantly reducing the volume for loading and transportation, making it suitable for placer mining projects with frequent site changes.
Core Structure
Foldable Frame: Hinged and bolted connections, weld-free on-site assembly, facilitating container loading; commonly double-sided/middle folding.
Inclined Screen Surface: Round steel grating/polyurethane screen, adjustable gap 10–15 mm; some models include a vibrating motor for anti-clogging.
Clubbing System: Adjustable slope (commonly 4–8°), lined with bonded straw/grid boards for enhanced gravity separation; multiple sections can be spliced for extension.
Spraying Device: Foldable high-pressure water hoses on both sides for uniform rinsing and improved dissociation.
Drive/Agitation Mechanism: A small motor drives a slight agitation of the base plate to prevent sediment compaction and increase recovery rate to approximately 90% (significantly higher than the 30% of traditional fixed chutes).
Mainstream Models and Parameters (Commonly Used for Placer Gold)
Table: Model | Processing Capacity | Weight | Dimensions (Unfolded/Folded)
1020 Type | 45–50 t/h | Approx. 1.2 t | Suitable for small sites and light trailers
1530 Type | 50 m³/h | Approx. 2 t | Unfolded length 5m+, can fit in a 20-foot container after folding
Advantages and Applicable Scenarios
Superior Mobility: Compact size after folding, quick relocation by road/short distance, especially suitable for river channels, seasonal placer mines, and small mining sites;
High Efficiency and Low Consumption: Anti-caking agitation, high recovery rate; power mostly between 1.5–3 kW, low energy consumption;
Easy Operation and Maintenance: No professional team required, on-site screw assembly, easy replacement of sprayers, screens, and gaskets;
Applications: Roughing/enrichment of placer gold, placer tin, placer platinum, and coastal placer mines; also suitable for tailings recycling.
Selection and Usage Points
Screen Size and Slope: The screen size should be determined based on the ore particle size (10–20 mm is common); the recommended chute slope is 4–6° to prevent gold particles from being washed away.
Material: The frame should be made of corrosion-resistant steel; the screen should be made of wear-resistant round steel/polyurethane; the chute lining should preferably be a combination of wear-resistant rubber and gold-adhesive straw.
Water Supply and Environmental Protection: A stable water source is required; tailings must be treated by sedimentation to avoid polluting rivers.
Transportation and Fixing: After folding, the hinges must be locked to prevent shaking and damage to the structure during transportation.
Additional Tips
It is often used in conjunction with a drum screen/vibrating feeder to form a mobile mineral processing line; to further improve the recovery rate, a centrifuge/shaking table can be connected to the end of the chute for fine selection.
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