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JXSC South Africa STLB 20t/h Gold Centrifugal Concentrator Price & Working Principle
If you’re in the gold mining business in Africa, you’ve probably heard of the STLB 20t/h Gold Centrifugal Concentrator from JXSC Mine Machinery. This machine is a workhorse in many small to medium-scale gold operations, especially in countries like South Africa, Ghana, Zimbabwe, Tanzania, and Sudan. In this article, we’ll break down everything you need to know – from the working principle to daily maintenance, and yes, we’ll talk about price too.
What Is the STLB 20t/h Gold Centrifugal Concentrator?
Simply put, it’s a gravity separation device designed to capture fine gold particles from ore or alluvial material. The "20t/h" means it can handle up to 20 tons of material per hour, making it ideal for medium-scale processing plants.
JXSC Mine Machinery is a well-known Chinese manufacturer with decades of experience in mineral processing equipment. Their STLB series centrifugal concentrators are widely used across Africa because they are robust, easy to operate, and cost-effective.
How Does It Work? (Working Principle)
The working principle is straightforward but clever. Here’s how it works in simple terms:
Material Feed: Slurry (mixture of water and ground ore) is fed into the rotating bowl.Centrifugal Force: The bowl spins at high speed (up to 800-1000 RPM), creating a strong centrifugal force.
Gravity Separation: Heavier particles like gold get trapped in the grooves inside the bowl, while lighter gangue material is flushed out.
Concentrate Discharge: After a few minutes, the machine automatically stops, and the gold concentrate is washed out manually or via a control system.
It’s like a high-speed washing machine that only keeps the gold!
Real-World Use Cases Across Africa
1. South Africa – Artisanal and Small-Scale Gold Mines
In South Africa’s gold-rich regions like Witwatersrand, the STLB 20t/h is used to recover fine gold from tailings and hard rock ore. One operator in Mpumalanga reported a recovery rate of over 90% for gold particles down to 10 microns.
2. Ghana – Alluvial Gold Operations
Ghana is one of Africa’s top gold producers. Small-scale miners near Obuasi and Tarkwa use the STLB 20t/h to process riverbed material. It’s reliable even with high clay content.
3. Zimbabwe – Hard Rock Gold Processing
In Zimbabwe, where gold is often found in quartz veins, the concentrator is used after a ball mill to recover free gold. One user in Kadoma said it reduced their mercury use by 80%.
4. Tanzania – Gold from Volcanic Rocks
Near Lake Victoria, gold occurs in fine-grained volcanic rocks. The STLB 20t/h handles this well, especially when paired with a trommel screen.
5. Sudan – Desert Gold Mining
In Sudan’s dry climate, water is scarce. The STLB concentrator can operate with a re-circulating water system, making it practical for arid environments.
Structure & Key Features
The STLB 20t/h has a simple but durable design:
Bowl Material: Stainless steel or polyurethane lining (anti-wear)Motor: 7.5 kW – 11 kW, depending on model
Control Box: Manual or automatic start-stop
Frame: Heavy-duty steel, powder-coated for rust resistance
What Makes It Special?
High Enrichment Ratio: Up to 1000:1 (you get a very rich concentrate)Fine Gold Recovery: Captures particles as small as 5 microns
Low Water Consumption: Only 1-2 m³ per hour
No Mercury Required: Environmentally friendly
What Ores Can It Process?
This concentrator is versatile. It works well with:
Alluvial gold (river sand, gravel)Hard rock gold (after crushing and grinding)
Platinum, tin, tungsten, tantalum (other heavy minerals too)
Pro Tip: For best results, feed material should be less than 2mm in size. If you have larger rocks, crush them first.
Processing Capacity & Parameters
| Parameter | Value |
|---|---|
| Model | STLB 20 |
| Capacity | 15 – 25 t/h (slurry) |
| Feed Size | < 2 mm |
| Water Pressure | 0.1 – 0.3 MPa |
| Motor Power | 7.5 kW |
| Weight | ~ 800 kg |
| Dimensions | 1.8m x 1.2m x 1.5m |
Note: Actual capacity depends on feed density and material type.
Price: How Much Does It Cost?
The JXSC South Africa STLB 20t/h Gold Centrifugal Concentrator price varies based on:
Configuration (manual vs. automatic discharge)Lining material (rubber vs. polyurethane)
Shipping and customs to your location
Estimated price range: $5,500 – $8,500 USD (FOB or CIF depending on destination).
? Want an exact quote? Contact JXSC Mine Machinery directly through their website or your local distributor in South Africa.
Daily Operation & Maintenance Tips
Check Bowl Condition: Inspect for wear every 100 hours. ｒｅｐｌａｃｅ if grooves are too shallow.Lubricate Bearings: Grease the main shaft bearings weekly.
Clean Concentrate Regularly: Don’t let gold build up too long – it can affect balance.
Monitor Water Flow: Low water pressure reduces recovery rate.
Balance the Rotor: If machine vibrates, check for uneven wear.
Common Mistake: Overfeeding! The machine works best when you maintain a steady, moderate feed rate.
Comparison with Other Gold Recovery Equipment
| Feature | STLB 20t/h | Shaking Table | Sluice Box | Knelson Concentrator |
|---|---|---|---|---|
| Capacity | High (20 t/h) | Low (1-2 t/h) | Medium | High |
| Fine Gold Recovery | Excellent | Good | Poor | Excellent |
| Water Use | Low | High | High | Low |
| Cost | Moderate | Low | Very Low | High |
| Maintenance | Easy | Moderate | Easy | Moderate |
The STLB 20t/h is a great balance between cost and performance. It’s not as expensive as a Knelson but offers similar recovery for many gold applications.
Application Scenarios Summary
Small to medium gold mines (5-50 tons per day)Mobile processing plants (easy to move)
Mercury-free gold recovery (eco-friendly)
Upgrading gold from sluices or jigs
Second-stage cleaning after a ball mill
Final Thoughts
The JXSC STLB 20t/h Gold Centrifugal Concentrator is a reliable, affordable, and effective tool for gold recovery in Africa. Whether you’re in South Africa, Ghana, Zimbabwe, or Tanzania, this machine can help you get more gold with less effort and lower environmental impact.
Remember: Choosing the right gravity separation equipment is key to maximizing your gold recovery. The STLB 20t/h from JXSC Mine Machinery is a solid choice for any serious gold operation.
? Need help with selection or pricing? Reach out to JXSC for a customized quote based on your ore type and location. They have a strong presence in Africa and understand local mining conditions.
Happy mining, and may your concentrates be rich!
