1. PAINPOINT DRIVEN OPENING

Are you managing gold recovery operations where declining ore grades and rising operational costs are squeezing your margins? Key challenges in material concentration and final recovery often include:

Inefficient Fine Gold Loss: Up to 1530% of micronsized gold particles can be lost in traditional sluices or jigs, representing a direct revenue drain with every ton processed.
High Water Consumption: In arid regions or sites with strict environmental permits, conventional concentration methods can require over 200 gallons per ton, creating significant sourcing and tailings management costs.
Operator Dependency & Inconsistency: Manual tuning and operation of concentration equipment lead to variable recovery rates, making grade control and production forecasting difficult.
Downtime for Concentrate CleanUp: Frequent shutdowns to manually clean up concentrates from tables or spirals halt your primary processing circuit, reducing overall plant availability.

How do you capture the maximum value from every ounce without exponentially increasing your water, energy, and labor overhead? The solution lies in selecting the right primary concentration technology.

2. PRODUCT OVERVIEW: Knelson Concentrators for Primary Gold Recovery

A Knelson Concentrator is a batchtype, centrifugal gravity concentration device designed for the recovery of free gold and other heavy minerals from grinding circuit slurries. Its core function is to achieve high mass rejection while retaining over 95% of free gold particles, producing a highgrade concentrate for further treatment.

Operational Workflow:
1. Feed Introduction: Slurry from the grinding mill cyclone underflow is introduced under pressure into the rotating cone.
2. Centrifugal Concentration: As the cone spins at high speed (up to 200 Gforce), centrifugal force pins heavy gold particles against the riffled lining.
3. Fluidized Bed Action: Continuous injection of fluidization water through the riffles creates a teetering bed, allowing dense gold to be trapped while lighter gangue material is flushed upward and out.
4. Concentrate Retention: Gold accumulates in the riffles throughout the batch cycle (typically 30120 minutes).
5. Automated Discharge: At cycle end, rotation stops and the concentrated heavy fraction is automatically flushed to a secure collection point.

Application Scope & Limitations:
Scope: Ideal for recovering free (liberated) gold >30 microns in size from grinding circuits. Highly effective as a primary concentrator in both hard rock and alluvial operations.
Limitations: Less effective on flat or flaky gold particles. Performance diminishes on ultrafine (<20 micron) gold without specific modifications. Requires a consistent feed density and pressure for optimal operation.

3. CORE FEATURES

Automated Discharge System | Technical Basis: Programmable logic controller (PLC) with hydraulic/pneumatic valve sequencing | Operational Benefit: Enables handsfree concentrate extraction, eliminating manual labor inside the plant and standardizing cleanup cycles | ROI Impact: Reduces labor costs per cleanup by approximately 75% and increases primary mill runtime by preventing unnecessary stops.

Variable GForce Drive | Technical Basis: Variable frequency drive (VFD) controlling AC motor speed | Operational Benefit: Allows operators to precisely tune centrifugal force from 60200 Gs to match changing feed grade or particle size distribution | ROI Impact: Optimizes recovery efficiency across varying ore types, preventing loss during grade fluctuations; field data shows a typical 58% recovery improvement over fixedspeed units.

Patented Fluidization System | Technical Basis: Pressurized water injected through porous rifle sections | Operational Benefit: Maintains a dynamic bed that continuously rejects light minerals while retaining gold, preventing compaction and maximizing enrichment ratios | ROI Impact: Produces a highergrade concentrate (often >1000x upgrade), significantly reducing downstream processing time and reagent costs in the cleaning circuit.

AbrasionResistant Liner Kits | Technical Basis: Interchangeable liners manufactured from polyurethane or specialized composite materials | Operational Benefit: Protects the central cone from wear in highly abrasive slurries, extending core component life | ROI Impact: Reduces longterm capital expenditure by protecting the main asset; liner changeout downtime is minimized compared to full component replacement.

Modular Design & Scalability | Technical Basis: Standardized dimensions and connection points across model sizes (from laboratory 3" to production 48" units) | Operational Benefit: Simplifies plant expansion planning and allows for easy integration into existing circuits with minimal structural modification | ROI Impact: Provides a clear, lowrisk pathway to scale production capacity as reserve confidence grows.

4. COMPETITIVE ADVANTAGES

| Performance Metric | Industry Standard (Traditional Sluice/Jig) | Knelson Concentrator Solution | Advantage (% Improvement) |
| : | : | : | : |
| Free Gold Recovery Rate (>75µ) | ~7085% | Consistently >95% (with proper liberation) | +1025 percentage points |
| Water Consumption per ton processed| ~200300 gallons/ton (recirc.)| <15 gallons/ton (fluidization only) |9095% |
| Concentrate Upgrade Ratio (mass pull)~500:1 mass rejection| ~50:1 mass rejection~5000 oz/ton conc.)| ~5000 oz/ton conc.)| +900% enrichment |
| Operator Attention Required High manual cleaning & monitoring Low automated batch cycles|80% labor time |

5. TECHNICAL SPECIFICATIONS

Model Range & Capacity: Laboratory (3", 7.5") up to Production (30", 48"). Typical 30" unit handles 60100 TPH of cyclone underflow at up to 40% solids by weight.
Power Requirements: Dependent on model; a KCCD30 requires a 30 HP (22 kW) main drive motor and a 3 HP (2.2 kW) fluidization pump motor. Standard supply: 460V/3Ph/60Hz.
Material Specifications: Mainframe: Carbon steel with corrosionresistant coating. Cone & Riffling: Highstrength polymer or urethane liners. Fluidization system: Stainless steel components.
Physical Dimensions (KCCD30): Approx. height: 2m; Diameter 1m; Dry weight 1500 kg.
Environmental Operating Range: Ambient temperature 40°C; Requires protection from direct weather; not rated for explosive atmospheres without modification.

6. APPLICATION SCENARIOS

Hard Rock Underground Mine Grade Control Challenge

Challenge: A Canadian underground operation faced erratic head grades, causing significant gold loss to tails when using fixedgravity circuits. Manual table performance was inconsistent across shifts.
Solution: Installation of two Knelson Concentrators in parallel on the primary ball mill discharge, with PLCcontrolled automated cycles synced to shift changes.
Results: Achieved an average free gold recovery rate of 96%. The consistent highgrade concentrate simplified downstream smelting scheduling. Annual recovered ounces increased by an estimated 8%, paying back the capital investment in under nine months.

Alluvial / Placer Operation Water Scarcity

Challenge: A West African placer mine had limited freshwater access and high pumping costs. Traditional sluicing required unsustainable water volumes.
Solution:: Implementation of a closedloop water system with Knelson Concentrators as the primary recovery unit., drastically reducing fresh water demand.,
,Results:: Freshwater consumption per ton of gravel processed dropped by over 92%. The operation secured its environmental permit renewal,,and reduced diesel costs for water pumping by approximately $70,,000 annually.,

,7.,COMMERCIAL CONSIDERATIONS

,Equipment Pricing Tiers:,
,EntryLevel / Lab Units:,For test work and smallscale production.,Capital cost range $25,,000 $80,,000.,
,Standard Production Models,(e.g., KCCD20,, CD30): For integrated milling circuits.,Capital cost range $150,,000 $350,,000 depending on automation level.,
,Custom HeavyDuty Configurations:,For hightonnage or extreme abrasion applications.,Capital cost starting at $400,,000.,

,Optional Features:,
,Advanced PLC with SCADA interface,
,Secondary security concentrate collection system,
,Wear monitoring sensors on critical liners,
,Stainless steel construction for corrosive environments,

,Service Packages:,
,Basic Warranty:,12 months on parts,,6 months on labor.,
,Extended Protection Plans:,35 year comprehensive coverage including scheduled liner replacements.,
,OnSite Training Packages:,For operations and maintenance crews.,

,Financing Options:,Available through partnered financial institutions,: including equipment leasing,,rentaltoown agreements,,and project financing tailored for mine development stages.,

,8.,FAQ

,Q1,: Is my ore suitable for a Knelson Concentrator?,
A preliminary mineralogical analysis showing free gold liberation size is recommended.. Laboratoryscale continuous testing is available using smaller units to determine expected recovery rates specific to your ore.,

,Q2,: How does this integrate with my existing CIP/CIL or flotation circuit?,
The concentrator acts as a preconcentrator,. typically installed on the grinding mill cyclone underflow.. It pulls out free gold before it reports to leaching or flotation,. reducing residence time,, reagent consumption,,and carbon fouling risk in downstream processes.,

,Q3,: What is the typical operational maintenance requirement?,
Daily checks involve fluidization water pressure gauges.. The primary wear items are replaceable liner kits,. with service life ranging from 6,18 months based on abrasiveness.. Bearing service intervals are typically at 10,000 hours.,

,Q4,: Can it recover other valuable heavy minerals?,
Yes,. Knelson Concentrators are effective on other highspecificgravity minerals like platinum,, sulphides containing silver/copper,,and tungsten.,

,Q5,: What are realistic expectations for concentrate grade?,
Concentrate grade varies with feed material,. but industry data shows typical enrichment producing between 2,10 kg of concentrate per batch containing 30,70% of recovered gold by weight—a massive upgrade from head grade..

,Q6,: Are there financing options available for new projects?,
Yes,. several flexible financing solutions exist—from standard leasing arrangements that preserve capital too project finance models tied too mine development milestones..

,Q7,: What training is provided too ensure our operators achieve optimal performance?,
Comprehensive training includes classroom instruction tooo theory off operation along side handson commissioning supervision.. Detailed manuals annd troubleshooting guides are standard issue