Dewatering Vibrating Screen

Advantages of Dewatering Vibrating Screen

• Overview of Dewatering Screens

  The dewatering vibrating screen is a piece of high-frequency screening equipment designed for solid-liquid separation in wet sand-making and mineral processing workflows. Its primary function is to reduce the surface moisture content of sand discharged from sand washers—typically 20%–30%—down to 5%–8%, bringing the finished sand to a standard suitable for direct loading and transport. When integrated with a hydrocyclone, it can simultaneously recover fine sand, achieving a recovery rate of over 95% for particles in the 0.075–2mm range.

  Application Scenarios:

  1. Wet-process manufactured sand production lines (dewatering following sand washing)

  2. Fine sand recovery systems (integrated with hydrocyclones and slurry pumps)

  3. Tailings dry stacking and coal slime dewatering

  4. Dewatering of concentrate or tailings slurries in mineral processing plants

1. 

   High-Frequency Dewatering Screen

2. 

   Sand Washing Dewatering Screen

3. 

   Fine Sand Recovery Dewatering Screen

4. 

   Tailings Dewatering Screen

• Four Key Application Scenarios for Dewatering Screens

  Dewatering screens are not limited to the simple setup of being placed immediately after a sand washer; their role within a wet-process production line is determined by three variables: material characteristics, production scale, and product specifications.

  Scenario 1: Wet-process manufactured sand production lines — Dewatering following sand washing

  The most typical application.

  • Process flow: Crushing → Sand making → Sand washer (bucket wheel/spiral) → Dewatering screen → Finished sand stockpile

  • Feed conditions: Washer discharge moisture content 20%–30%; variable silt/clay content

  • Target output: Moisture content ≤ 8%; no dripping during truck loading; dry stockpile area

  • Selection logic: Match dewatering screen capacity to production line throughput (t/h) × 1.2 (safety factor); derate appropriately if raw material has high silt/clay content

  • Solutions provided: Eliminates environmental fines for dripping/runoff; resolves capital turnover issues caused by occupying space for 2–3 days of air-drying

  Typical configuration: 100 tph sand-making line → 3XL1115 spiral sand washer + TS1836 dewatering screen

  Scenario 2: Fine sand recovery system — Integrated dewatering screen, cyclone, and slurry pump

  Improves gradation + recovers 10%–15% of lost yield.

  • Process flow: Sand washer overflow/tailwater → Slurry pump → Cyclone (thickening) → Underflow to dewatering screen → Coarse and fine sand mixed and discharged after dewatering

  • Core value: Sand washer tailwater contains significant amounts of high-quality fine sand (0.075–2mm); traditional processes discharge this directly into settling ponds—effectively wasting profit. Closed-loop recovery using a dewatering screen and cyclone achieves a fine sand recovery rate of ≥ 90%–95%

  • Additional benefits: Reduces settling pond desilting frequency from monthly to quarterly, eliminating labor and excavator rental costs; fills the 0.15–0.3mm gradation gap to meet ASTM C33 / GB/T 14684 curve requirements, significantly enhancing concrete strength

  Suitability assessment: Any production line with sand washer overflow discharge is a candidate for a recovery section upgrade. Equipment costs are typically recouped within 1–2 months through revenue from the recovered fine sand.

  Scenario 3: Tailings dry stacking

  A mandatory environmental requirement for mineral processing plants.

  • Feed: Mineral processing tailings slurry (moisture content: 60%–80%; solid particle size: < 5 mm)

  • Process: Thickener → Dewatering screen → Dry tailings transport/stacking

  • Dewatering performance: Tailings filter cake moisture reduced to 15%–20%, meeting environmental standards for dry stacking

  • Typical ore types: Iron, copper, gold, and phosphate tailings; coal slime

  • Equipment requirements: Typically utilizes large-screen-area models (TS1836 or larger); screen aperture (0.3–1.0 mm) is adjusted based on slurry concentration

  Key differences from Scenario 1: Tailings dry discharge prioritizes environmental compliance, with a slightly higher tolerance for moisture content compared to manufactured sand dewatering (15%–20% vs. 5%–8%); additionally, tailings slurries contain a very high proportion of fine particles, making screens prone to blinding, which necessitates superior elasticity and self-cleaning capabilities in PU screens.

  Scenario 4: Dewatering of Concentrates at Mineral Processing Plants

  Enhancing concentrate grade and transport efficiency.

  • Application: Pre-dewatering of slurries such as iron, copper, and lead-zinc concentrates following magnetic separation or flotation

  • Process position: After separation operations and prior to drying or concentrate storage bins

  • Value: Lowers moisture content for transport (reducing freight costs associated with water weight in wet tonnage), shortens downstream drying time, and prevents water leakage from storage bins

  • Note: Concentrate dewatering requires finer screen apertures (0.15–0.5 mm), customized according to the mineral's true density and particle morphology