Dewatering Screen for Sand Washing Plants (ZSD)
A dewatering screen for a sand washing plant is a high-frequency vibrating screen that strips surface water off washed sand before the sand reaches the stockpile. Baichy ZSD dewatering screens take washer discharge at 20-30% moisture down to 5-8%, across 30-250 t/h of capacity and a maximum feed size of 10 mm.
How Does a Dewatering Screen for a Sand Washing Plant Fit into the Line?
The screen sits between the sand washer and the finished-sand stockpile. The flow is crushing, sand making, washing on a bucket wheel sand washer or a screw sand washer, dewatering, then stockpile.
• Feed — washer discharge at 20%-30% moisture, with a silt and clay load that varies with the pit.
• Sizing rule — dewatering screen capacity equals line throughput in t/h multiplied by 1.2, derated when silt and clay are heavy.
• What it removes — the fines that would drip and run off, plus 2-3 days of stockpile space for air drying.
High-frequency dewatering screen
ZSD Dewatering Screen Specifications
| Model | Motor Power (kW) | Capacity (t/h) | Feeder Size (mm) | Sieve Plate Size (mm) | Sieve Plate Area (㎡) | Overall Dimension (mm) |
|---|---|---|---|---|---|---|
| ZSD1230 | 1.9 | 30–80 | ≤10 | 1200×3000 | 3.6 | 3085×1590×1439 |
| ZSD1236 | 2.2 | 30–80 | ≤10 | 1200×3600 | 4.32 | 3677×1590×1600 |
| ZSD1530 | 2.2 | 80–120 | ≤10 | 1500×3000 | 4.5 | 3075×2491×1601 |
| ZSD1536 | 3 | 80–120 | ≤10 | 1500×3600 | 5.4 | 3200×2491×1802 |
| ZSD1836 | 7.5 | 100–140 | ≤10 | 1800×3600 | 6.48 | 3758×3075×1988 |
| ZSD1842 | 7.5 | 100–140 | ≤10 | 1800×4200 | 7.56 | 4368×3075×2000 |
| ZSD1848 | 7.5 | 100–140 | ≤10 | 1800×4800 | 8.64 | 4791×3065×1959 |
| ZSD2442 | 11 | 140–180 | ≤10 | 2400×4200 | 10.1 | 4403×3737×1931 |
| ZSD2448 | 11 | 140–180 | ≤10 | 2400×4800 | 11.52 | 5008×3737×1977 |
| ZSD3048 | 15 | 200–250 | ≤10 | 3000×4800 | 14.4 | 4959×4518×2218 |
The output will vary according to different materials, feed particle size and other factors. Every model accepts 10 mm feed or less, so the screen follows a washer, not a crusher. Sieve plate area runs from 3.6 ㎡ on ZSD1230 to 14.4 ㎡ on ZSD3048, and motor power from 1.9 kW to 15 kW.
What Moisture Content Does a High Frequency Dewatering Screen Reach?
Washed sand leaves at 5%-8% surface moisture; tailings duty lands at 15%-20% cake moisture. The feed explains the gap: sand leaves a washer at 20%-30% moisture, a tailings slurry arrives at 60%-80%.
• Tailings dry stacking on a tailings dewatering screen — thickener, screen, dry stacking, with filter cake at 15%-20% from a solids feed below 5 mm.
• Aperture — 0.3-1.0 mm on tailings, set by slurry concentration; 0.15-0.5 mm on concentrate, set by true density and particle shape.
dewatering vibrating screen
Can a Dewatering Screen Recover Fine Sand?
Yes. A slurry pump, a hydrocyclone and a dewatering screen in series recover 90%-95% of the fine sand a washer would discharge to the settling pond, and over 95% of particles in the 0.075-2 mm range.
• Circuit — washer overflow or tailwater, slurry pump, cyclone for thickening, cyclone underflow onto the screen, then coarse and fine sand discharged together. A packaged fine sand recovery machine carries the same three stages on one frame.
• Gradation — the recovered fraction fills the 0.15-0.3 mm gap in the sand curve that ASTM C33 and GB/T 14684 call for.
• Payback — settling pond desilting drops from monthly to quarterly, and the section is usually paid back within 1-2 months from the recovered sand.
How Do You Size a Dewatering Screen for Your Sand Washing Plant?
Sizing starts from the plant's washed-sand output in t/h, not from the washer's nominal rating. Multiply by 1.2, then take the ZSD model whose capacity range brackets the result.
• Bandwidth — ZSD1230 is rated 30-80 t/h on a 1.9 kW motor; ZSD3048 is rated 200-250 t/h on a 15 kW motor.
• Deck length inside one band — ZSD1530 and ZSD1536 both cover 80-120 t/h, and differ in sieve plate size: 1500×3000 mm against 1500×3600 mm.
• 100 t/h worked example — 100 t/h × 1.2 = 120 t/h, which ZSD1836, ZSD1842 and ZSD1848 each cover at 100-140 t/h on a 7.5 kW motor; only sieve plate area separates them, at 6.48 ㎡, 7.56 ㎡ and 8.64 ㎡.
Working Principle of a ZSD Dewatering Vibrating Screen
Working Principle of a ZSD Dewatering Vibrating Screen
A ZSD dewatering screen has four assemblies: the screen box, the vibrator, the screen deck and the damping springs. The vibrator drives the box at high frequency, water and fine impurities are forced through the mesh, and the retained sand travels along the deck to discharge.
• Deck inclination — the deck of a sand dewatering screen is set at an angle so material flows while it drains.
• Wear surface — polyurethane decks resist blinding and self-clean, which matters on slurries with a high fines fraction.
FAQ: Dewatering Screens for Sand Washing Plants
What size dewatering screen does a 100 t/h sand washing plant need?
A 100 t/h washed-sand output becomes 120 t/h of screening duty once the 1.2 factor is applied, which ZSD1836, ZSD1842 and ZSD1848 each cover at 100-140 t/h on a 7.5 kW motor. They differ only in sieve plate area, at 6.48 ㎡, 7.56 ㎡ and 8.64 ㎡, so heavy silt and clay alone call for a derate.
How much moisture does a dewatering screen remove from washed sand?
Washer discharge arrives at 20%-30% moisture and leaves the screen at 5%-8%, dry enough to load onto a truck without dripping. Tailings dewatering is a separate target: 15%-20% filter cake moisture for dry stacking.
Can a dewatering screen recover fine sand from washer overflow?
Yes. A slurry pump, hydrocyclone and dewatering screen in series recover 90%-95% of the fine sand that would otherwise go to the settling pond, and the recovery rate is over 95% in the 0.075-2 mm range.
What is the maximum feed size of a ZSD dewatering screen?
10 mm on every model in the series. A ZSD dewatering screen dewaters and deslimes minus 10 mm washer discharge; it is not a sizing screen for crusher output.
Which screen deck suits tailings dewatering?
Polyurethane. Tailings slurries carry fines that blind wire cloth, so PU decks are used for their elasticity and self-cleaning behaviour, at 0.3-1.0 mm aperture on tailings and 0.15-0.5 mm on concentrate.
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