Copper-Gold Processing Equipment: Crushing to Flotation
Building a copper-gold ore processing plant requires equipment selection based on ore characteristics (oxidation rate, copper/gold occurrence, liberation size) and the chosen process (flotation, cyanidation, gravity separation, etc.). Taking typical copper-gold sulphide ore as an example, here is a complete list of essential equipment – from crushing to flotation – for a standard flotation plant.
1. Crushing & Screening – Run‑of‑Mine Preparation
| Equipment | Function | Notes |
|---|---|---|
| Vibrating feeder | Evenly feeds ore from the bin into the primary crusher | Prevents crusher choking and uneven load |
| Jaw crusher | Primary crushing (ROM to ~300 mm) | Standard choice for most medium plants |
| Cone crusher | Secondary and fine crushing (down to ≤15 mm) | Multi-cylinder hydraulic cone crusher offers high efficiency for hard ores; spring cone is lower cost |
| Vibrating screen | Classifies crushed material; oversize returns to crusher (closed circuit) | Typically a circular motion screen |
2. Grinding & Classification – Mineral Liberation
| Equipment | Function | Notes |
|---|---|---|
| Ball mill | Core grinding equipment | Grate discharge for primary grinding; overflow type for secondary grinding |
| Spiral classifier or hydrocyclone | Forms closed‑circuit with ball mill to control grind size | Hydrocyclones are more efficient and compact; modern plants prefer cyclones |
3. Flotation – Copper & Gold Recovery (Core)
| Equipment | Function | Notes |
|---|---|---|
| Conditioning tank | Mixing and conditioning slurry with reagents before flotation | Ensures full contact between reagents and minerals |
| Flotation machine | Core separation equipment | Self‑aerating mechanical cells (e.g., XCF/KYF combination) can operate without froth pumps; forced‑air cells require blowers |
| Flotation column | For fine particles or high‑grade concentrate | Simplifies flowsheet but has lower throughput per unit |
4. Concentrate Dewatering – Drying & Storage
| Equipment | Function | Notes |
|---|---|---|
| Thickener | Raises concentrate slurry density from 20–30% solids to 40–60% | Center‑drive or peripheral‑drive type |
| Filter press or ceramic filter | Further dewaters to 8–15% moisture | Ceramic filters have lower energy consumption; plate‑and‑frame presses work well for fine particles |
5. Tailings Handling
| Equipment | Function | Notes |
|---|---|---|
| High‑efficiency thickener | Thickens tailings before disposal; maximizes water recovery | Recycled water is important for flotation performance |
| Slurry pump | Transfers slurry (tailings, concentrate, intermediate products) | Must be abrasion‑resistant (high‑chrome or rubber‑lined) |
6. Auxiliary Equipment
| Equipment | Function |
|---|---|
| Blower | Provides air for forced‑air flotation cells or oxidation tanks |
| Reagent preparation & dosing system | Mixing tanks, dosing pumps for collectors, frothers, modifiers |
| Samplers, instruments & automation | Process control and metering |
7. Additional Equipment for Special Ore Types
| Ore Condition | Additional Equipment | Reason |
|---|---|---|
| Coarse free gold or well‑liberated gold | Jig, shaking table, or Nelson concentrator (gravity separation ahead of flotation) | Recover coarse gold early to avoid loss in flotation or cyanidation |
| Oxidized copper‑gold (refractory to flotation) | Agitation leach tanks (acid or cyanide), carbon adsorption columns (CIP/CIL), zinc precipitation | Requires hydrometallurgical circuit; flotation alone is ineffective |
| Arsenic‑ or carbon‑bearing ores | Roaster or oxidation tank | Destroys sulfide coatings or prevents preg‑robbing by carbonaceous material |
| Water‑scarce or high environmental protection | High‑density thickener, tailings filter press (dry stacking) | Improves water recovery and enables dry tailings disposal |
8. From Concentrate to Copper Metal – Electrorefining and Cathode Blanks
After flotation, the copper‑gold concentrate is typically sent to a smelter to produce blister copper. The blister copper then undergoes copper electrorefining to achieve high‑purity cathode copper (LME Grade A). This stage introduces two critical components:
Cathode blanks (also called starting sheets or permanent cathode plates) serve as the substrate on which pure copper deposits during electrorefining. They are usually made of stainless steel or high‑purity copper and must have a flat, smooth surface to ensure uniform deposition and easy stripping.
In the electrorefining cell, blister copper anodes and cathode blanks are suspended alternately in an electrolyte of copper sulfate and sulfuric acid. When direct current passes through, copper from the anode dissolves and plates onto the cathode blanks, producing high‑purity cathodes.
Typical equipment for copper electrorefining includes:
Electrolytic cells with anode and cathode hanging systems
Rectifiers for DC power supply
Electrolyte circulation and heating systems
Cathode stripping machines
Cathode blanks (permanent stainless steel cathodes or copper starting sheets)
PRS supplies not only crushing and flotation equipment but also complete copper electrorefining packages, including high‑quality cathode blanks designed for long service life and consistent copper quality.
Core Selection Tips
Plant scale dictates equipment size. A 100 t/d plant may use jaw crusher + roll crusher, while a 5,000 t/d plant must use cone crushers.
Wear materials matter. For copper‑gold ores containing quartz or other hard gangue, use high‑chromium cast iron for crusher jaws, mill liners, and slurry pump wet parts.
Always start with a metallurgical test report. Equipment selection should be based on ore characterization and process design from a qualified engineering firm.
Need a Custom Equipment Recommendation?
If you have your throughput, ore hardness, feed size, and target product requirements, contact PRS for a tailor‑made equipment list and quotation – from crushing to flotation and even to copper electrorefining with reliable cathode blanks.
