Yes. The LZ series is designed as a standalone skid-mounted unit. It requires a flat, level pad (concrete or compacted gravel) rated for the unit weight, a power connection to the combined motor load, and a slurry feed line from the wash plant overflow sump. No structural civil works are required in most installations. The slurry pump is close-coupled to the unit and the feed pipe length from the sump to the pump inlet should be kept below 3 m to avoid cavitation at high flow rates.

On river sand and alluvial gravel slurry (d50 approximately 0.2–0.5 mm, slurry density 1.2–1.4 t/m³), Cr26 wet-end components typically run 3,000–5,000 hours before the impeller and volute liner require replacement. On harder, more abrasive feeds (granite fines, quartzite sand), this reduces to 1,500–2,500 hours. We recommend keeping one spare impeller and liner set per unit in site inventory and scheduling wear-measurement inspections at 500-hour intervals.

The hydrocyclone cut point (d50 - the particle size recovered at 50% efficiency) depends on cyclone diameter, feed pressure, and slurry density. As a guide, the LZ250 operates at a d50 of approximately 45–75 µm, recovering most material above 0.1 mm; the LZ1200 operates at a d50 of approximately 100–150 µm, suited to coarser fine-sand recovery or high-volume dewatering where a higher cut point is acceptable. For applications requiring recovery of very fine material (sub-75 µm), a multi-cyclone arrangement or a smaller-diameter LZ model at lower throughput is recommended.

On granite (200–260 MPa) at standard operating clearance, high-chrome cast disc sets typically run 1,500–2,500 operating hours before the clearance has opened beyond specification and requires re-spacing or disc replacement. On softer materials (limestone, alluvial gravel), disc life exceeds 4,000 hours in most installations. We recommend keeping one spare disc set per shaft in site inventory and scheduling clearance checks at 500-hour intervals.

The counter-rotating disc geometry creates a shearing and kneading action between adjacent shafts that actively breaks up clay balls and strips clay coating from stone surfaces. In controlled trials on feeds with 30–40% clay-by-mass at 15–20% moisture, the GZS maintained stable throughput and consistent aperture over 8-hour shifts where equivalent flat-screen and trommel installations blinded within 20–40 minutes. For clay content above 40% or feeds with free moisture above 25%, we recommend combining the GZS with a downstream wheel washer or scrubber.

The axial clearance between discs on each shaft is set by spacer rings during assembly. To change the separation size, the shaft cartridges are withdrawn, the spacer rings replaced with the target-gauge set, and the cartridges reinstalled. For large separation-size changes (e.g., switching from 20 mm to 60 mm), this takes two to four hours per shaft. For in-range fine adjustment, the shaft-end adjusters allow ±5 mm variation without shaft removal.

Yes. The slurry pump speed (where a VFD is fitted) and the cyclone feed pressure together control the cut size and underflow density. Raising pump pressure recovers finer material; lowering it reduces fine-sand output and increases clarified overflow clarity. The wheel-washer weir height adjusts independently to set the coarse product's fines content. All adjustments are made while the machine is running.

The dewatering screen discharges clarified overflow water back to the wash-water tank for recirculation, and discharges a small volume of slurry - carrying sub-75 µm ultrafines - to the settling pond. The hydrocyclone overflow (very fine clay and water) also routes to the pond. For sites with tight discharge consent limits, a flocculation dosing system on the pond feed is recommended to accelerate settlement.