Gold extraction using zinc dust (Merrill-Crowe process) requires finely ground ore for optimal recovery. A tailored crushing and sand-making line ensures efficient particle size reduction, enhancing gold-zinc contact. Below is a breakdown of key equipment and parameters.
1. Jaw Crusher (Primary Crushing)
– Model: JC120
– Feed Size: ≤650mm
– Capacity: 100-200TPH
– Power: 90kW
2. Cone Crusher (Secondary Crushing)
– Model: CC200
– Output Size: ≤30mm
– Capacity: 80-150TPH
– Hydraulic Adjustment
3. Vertical Shaft Impact Crusher (Sand Making)
– Model: VSI-850
– Final Product: 0-5mm (90% passing)
– Throughput: 50-100TPH
4. Vibrating Screen
– Deck: 3-layer polyurethane mesh
– Screening Efficiency: ≥95%
Q1: Why is particle size critical for zinc dust gold processing?
A: Particles >75µm hinder zinc-gold contact, reducing recovery rates.
Q2: How to minimize over-crushing?
A: Use closed-circuit grinding with screens or hydrocyclones.
Q3: Can this line process other ores?
A: Yes, adaptable for copper, lead-zinc, but parameters may vary.
Project: Tanzania Gold Mine (2023)
Solution: JC120 + CC200 + VSI-850 configured for 0-5mm output. Achieved 93% gold recovery with zinc dust, up from 85% pre-retrofit.
For abrasive ores, tungsten carbide liners are recommended in crushers to extend wear life by 40%. Always conduct ore testing to optimize the circuit.
