Precious Metal Refining Unit
“Complete Borosilicate Glass Refining System for Gold, Silver & Platinum Recovery“
The Aarohi Scientific Precious Metal Refining Unit is a fully integrated borosilicate glass process system engineered for the chemical refining and recovery of gold, silver, platinum, palladium, and other noble metals using Aqua Regia and selective precipitation methods.
Unlike generic refining machines, our system is designed as a modular chemical refining plant, offering:
- Controlled dissolution
- Visual process monitoring
- High recovery efficiency
- Safe NOx fume scrubbing
- Corrosion-resistant construction
This system is ideal for:
- Gold jewelry manufacturers
- Precious metal recyclers
- E-waste recovery plants
- Assay laboratories
- Platinum group metal refiners
Why Borosilicate Glass is Critical in Precious Metal Refining
Borosilicate Glass 3.3 offers:
✔ Chemically inert surface
✔ Zero precious metal absorption
✔ High acid resistance
✔ Excellent thermal shock resistance
✔ Full process transparency
✔ Easy cleaning and residue removal
Unlike metallic systems, borosilicate prevents contamination and ensures higher purity output.
Technical Specifications
| Parameter | Specification |
|---|---|
| Batch Capacity | 1 Kg – 100 Kg |
| Construction | Borosilicate Glass 3.3 |
| Stirring | Mechanical Drive (Variable Speed) |
| Temperature Range | Ambient to 150°C |
| Gas Handling | Integrated Scrubber |
| Process Type | Batch / Semi-Continuous |
| Utilities | Heating mantle / Hot water / Cooling water |
| Automation | Manual / Semi-Automatic |
Core System Modules of Precious metal recovery system
1️⃣ Dissolution Reactor (Aqua Regia Reactor)
Borosilicate Glass 3.3 construction
Jacketed or non-jacketed
Mechanical agitation (PTFE/Glass impeller)
Temperature controlled dissolution
Capacity: 1 kg to 100 kg alloy batch
Designed specifically for nitric acid + hydrochloric acid processing.
2️⃣ Gas Scrubber Unit (NOx Removal System)
Toxic NOx gases are generated during gold refining.
Our glass scrubber system ensures:
Multi-stage gas absorption
Acid-resistant packed column
Water or alkali neutralization
Compliance-ready environmental design
3️⃣ Precipitation & Recovery Vessel
Hydrazine / SMB precipitation compatible
Clear visibility of gold precipitation
Smooth internal surface (zero metal absorption)
Easy discharge & filtration
4️⃣ Glass Filter Unit (Mobile or Fixed)
Vacuum filtration compatible
PTFE-lined filter plate
Precious metal cake recovery
Wheel-mounted option
5️⃣ Nitric Acid Boiling Apparatus (Lab Testing)
Reflux condenser
Acid-resistant glassware
Sample assay & small batch testing
Ideal for R&D and purity testing
Refining Processes Supported
Aqua Regia Gold Refining system
Silver Refining
Platinum Group Metal Recovery (PGM)
E-Waste Precious Metal Recovery
Catalyst Precious Metal Recovery
Optional Customizations
Fully automatic control panel
Acid dosing system
Temperature controllers
Vacuum system integration
Explosion-proof motor options
Why Choose Aarohi Scientific?
✔ Process-engineered glass assemblies
✔ Custom-built per batch capacity
✔ High chemical resistance
✔ Transparent & safe operation
✔ Modular and scalable design
✔ Designed by process engineers
✔ Export-ready documentation
Industries Served
- Jewelry Manufacturing
- Bullion Refining
- Precious Metal Recycling
- E-Waste Processing
- Research & Assay Labs
- Catalyst Recovery Units
FAQs
What is a precious metal refining equipment?
A precious metal refining unit is a chemical process system used to extract and purify gold, silver, platinum, and other noble metals using acid dissolution, precipitation, and filtration techniques.
What purity can be achieved?
Chemical refining using Aqua Regia can achieve purity levels up to 99.95% – 99.99% depending on process control.
Why use borosilicate glass in gold refining?
Gold refining plant from Borosilicate glass is chemically inert, corrosion-resistant, and does not absorb precious metals, ensuring high purity and contamination-free recovery.
Planning to set up a precious metal refining plant?
📩 Contact Aarohi Scientific for technical consultation, layout planning, and customized system design.
Glass Vacuum Pin Tube (VPT) for Precious Metal Refining
“The Glass Vacuum Pin Tube (VPT) is a specialized borosilicate glass component used in precious metal refining units for safe, controlled sampling and liquid transfer under vacuum conditions.
Designed specifically for Aqua Regia refining systems, the vacuum pin tube enables operators to extract process samples from dissolution or precipitation reactors without exposing the system to atmospheric contamination.“
High-Precision Borosilicate Glass Vacuum Pin Tubes for Molten Metal Sampling
Aarohi Scientific manufactures high-precision evacuated glass pin tubes designed for accurate molten metal sampling in precious metal refining, metallurgical testing, and alloy analysis applications.
These vacuum pin tubes are engineered with an ultra-thin bulb section (approximately 0.5 mm wall thickness) at the immersion end. When introduced into molten metal, the thin bulb section instantly softens and opens, allowing metal to enter the evacuated tube and form a clean, solidified sample pin.
This controlled vacuum filling process ensures consistent, slag-free sampling with minimal operator intervention.
Function in Precious Metal Refining Process
During gold and silver refining, precise sampling is critical for:
Monitoring dissolution progress
Checking metal concentration
Purity verification
Process control adjustments
Batch quality assurance
The Vacuum Pin Tube allows:
✔ Controlled suction-based sampling
✔ Acid-resistant operation
✔ Zero metal contamination
✔ Minimal process interruption
✔ Safe handling of corrosive media
Construction & Materials
- Material: Borosilicate Glass 3.3
- Chemical Resistance: Aqua Regia, Nitric Acid, Hydrochloric Acid
- Diameter Range: OD 4mm–8mm (customizable)
- Length: 140mm – 160 mm (customizable)
Borosilicate glass ensures:
- No absorption of precious metals
- Smooth internal surface
- High thermal shock resistance
- Easy cleaning between batches
Advantages Over Metallic Sampling Tubes
Unlike stainless steel or polymer tubes, glass vacuum pin tubes
- Do not contaminate gold solution
- Allow visual confirmation of liquid flow
- Resist acid corrosion
- Prevent metal loss due to surface adhesion
This makes them ideal for high-purity (99.9%+) gold refining systems.
Key Applications
- Gold refining via Aqua Regia
- Silver nitrate processing
- Platinum group metal recovery
- Catalyst precious metal recovery
- Laboratory assay testing
- Batch sampling in chemical reactors
What is a Vacuum Pin Tube in gold refining?
A vacuum pin tube is a borosilicate glass sampling tube used to extract process liquid under vacuum from a refining reactor without opening the system.
Why is glass preferred over metal for sampling?
Glass does not react with acids or absorb precious metals, ensuring higher recovery efficiency and contamination-free sampling.
