Jewellery & precious-metal workshop residues
Wipes, PPE, papers, packaging, floor sweepings and workshop consumables that may contain particles of gold, silver or platinum-group metals.
PRECIOUS METALS • CALCINATION • MATERIAL RECOVERY
Precious metal recovery furnaces, designed to preserve the value of every batch.
CFI Systems designs and integrates thermal systems for production residues containing precious metals. The furnace removes organic fractions in a controlled manner so that mineral and metallic constituents remain concentrated in a solid residue suitable for downstream recovery and refining.
The design covers not only the thermal chamber, but also batch segregation, handling, cooling, control of fine-particle carry-over, afterburning, flue-gas treatment and cycle traceability.
Gold • Silver • PGM
Segregated batches • Traceability
Calcination • Filtration
Preserve recoverable value
01Identify & segregate the batch
02Load trays / carts / dedicated supports
03Controlled calcination / thermal treatment
04Afterburning & fine-particle capture
05Cooling & solid-residue recovery
Material valueLimit loss of precious-metal-bearing fines into the gas stream
Batch managementSegregation, recipes and traceability for high-value materials
Usable residuePrepare ash and solids for analysis, melting or downstream refining
Controlled emissionsAfterburning, cooling, neutralisation and filtration according to the waste
Applications & residues
Recover value dispersed throughout production waste.
Precious metals can be present as very fine particles, deposits, powders, salts or traces dispersed in organic supports. Thermal treatment removes the combustible matrix while retaining as much of the metallic fraction as possible in the solid residue and in the capture system.
Each waste family requires a suitable recipe and handling concept: composition, moisture, calorific value, particle size, metal content, potential volatility, dust behaviour and the downstream recovery process all matter.
Polishing & finishing residues
Dust, compounds, filters, media and residues from polishing, grinding or finishing operations where control of particle carry-over is critical.
Catalysts & process residues
Powders, solids, sludges or catalyst supports containing platinum, palladium, rhodium or other recoverable metals, with the thermal recipe defined around the material chemistry.
Filters, cartridges & resins
Filter elements, ion-exchange resins, consumables and supports loaded with recoverable material from chemical, plating or surface-treatment operations.
Electronic components & residues
Selected component, powder or electronic-residue streams where thermal treatment is a relevant preparation step before metallurgical or chemical separation.
Sludges, salts & industrial residues
Dry or wet waste, salts, insolubles, resins, inks or production residues containing a valuable metallic fraction and requiring a dedicated study of the thermal cycle and emissions.
The furnace is not the final refining stage: it prepares and concentrates recoverable material. Ash, solids and captured dust can then be routed to suitable grinding, homogenisation, sampling, melting, leaching or refining operations.
Treatment principle
Remove the organic fraction without losing what you are trying to recover.
Process value depends on achieving the right balance: oxidise organic material sufficiently to produce a stable, usable residue while avoiding conditions that unnecessarily entrain fine particles or complicate downstream refining.
Depending on the product, CFI Systems studies static calcination, controlled thermal treatment or a dedicated firing cycle with management of air, temperature, negative pressure and residence time.
Controlled oxidationRecipes adapted to calorific value, moisture and batch behaviour.
Low carry-overAir velocities, injection and circulation designed to limit loss of valuable particles.
Consistent residueThe cycle continues to the calcination level required by the downstream recovery route.
Separate gas treatmentAfterburning and emission-control equipment sized to the flue-gas composition.
Batches, loading & cooling
Material segregation is part of the process.
In precious-metal recovery, mixing two batches can have as much economic impact as a poor thermal cycle. The installation is therefore designed around traceability, physical segregation and handling that reduces operator exposure.
1
Dedicated trays, baskets or carts
Containment is selected according to particle size, dust risk, batch mass and ash-recovery method.
2
Batch loading
Manual-assisted, mechanised or automatic loading depending on throughput and safety requirements.
3
Separate entry / exit
A pass-through arrangement can be studied to create forward flow and separate loading and hot-unloading areas.
4
Protected cooling
Ventilated cooling zone or enclosure to reduce support temperature before handling and improve operator safety.
5
Cycle traceability
Recipes, timestamps and batch parameters can be linked in the supervision system where internal traceability requires it.
6
Ash recovery
The design minimises retention zones and facilitates recovery of the solid residue without cross-contamination between batches.
Heating & calcination
Select the heating method around the material and particle-carry-over risk.
Heating can be gas-fired or electric depending on chamber size, throughput, control accuracy and the load itself. For very fine residues, a design avoiding direct flame contact may be advantageous in order to reduce unnecessary material movement and loss of valuable particles.
The chamber and combustion-air distribution are engineered to remove organic matter without generating excessive gas velocities across the material bed.
01Gas or electric heating depending on the project
02Direct flame avoided where the load requires it
03Air distribution adapted to powders and fine residues
04Programmable recipes by waste family
05Controlled heat-up and calcination phases
Afterburning & flue-gas treatment
Captured dust is also part of the material value.
The flue-gas line must both meet environmental requirements and limit loss of recoverable material. Particle carry-over is therefore a design parameter from the furnace chamber through to the final filtration stage.
Depending on the waste, the system can include afterburning, gas cooling, acid-gas neutralisation, high-efficiency filtration, additional treatment of volatile metals and emissions monitoring.
AfterburningOxidation of organic gases with controlled temperature, oxygen and residence time.
Gas coolingControlled temperature reduction before reagent injection and filtration.
NeutralisationTreatment of HCl, HF, SO₂ and other compounds according to waste characterisation.
Fine-particle captureBag filters, ceramic elements or another architecture selected according to temperature, particle size and recovery objectives.
From residue to recoverable metal
Thermal treatment prepares refining; it does not replace it.
After calcination or controlled thermal treatment, the mineral and metallic residue must be prepared for the next stage. The downstream route depends on the metal, the matrix, the concentration achieved and the site's recovery strategy.
1
Cooling
Stabilise the batch and reduce temperature before opening, handling or transfer.
2
Collection
Recover ash, fines and captured dust into containers identified by batch.
3
Homogenisation
Grinding or particle-size preparation where required to obtain a representative sample.
4
Analysis & sampling
Determine metal content before selecting the appropriate recovery route.
5
Metallurgical recovery
Melting, separation or metallurgical treatment according to the nature of the recovered fraction.
6
Refining
Chemical, electrolytic or other specialist downstream processes used to reach the required purity.
Energy & cooling
Recover heat when it benefits the process or the site.
On installations with sufficient thermal duty, heat leaving the afterburning stage can be recovered. The decision depends on operating hours, flue-gas temperature, cooling requirements before filtration and genuine site energy demand.
Heat recovery is designed without compromising flue-gas treatment stability or capture of precious-metal-bearing particles.
01Hot-water or thermal loops
02Process-air or utility preheating
03Space heating where appropriate
04Gas cooling integrated into the energy balance
05Consumption monitoring and recipe optimisation
Safety & containment
Protect the operator, the batch and the environment.
Residues to be recovered can combine solvents, resins, fine dusts, sludges, salts or high-calorific-value materials. The risk assessment defines the required safeguards for heating, extraction, oxygen, pressure, temperature, doors and cooling.
The chamber operates under controlled negative pressure to route emissions toward the flue-gas treatment system, while loading and cooling areas can be enclosed and ventilated.
Controlled negative pressureExtraction controlled to prevent fugitive emissions during the cycle.
Temperature & oxygenContinuous measurements used by the PLC to regulate air, heating and safety functions.
Runaway managementReduction of thermal input and dedicated safeguards for high-calorific-value waste.
Protected zonesEnclosures, ventilation and door interlocks for loading and cooling areas.
Automation, recipes & traceability
A repeatable cycle for each family of batches.
The supervision system allows operators to select recipes, follow thermal and aerodynamic parameters, record alarms and retain cycle history. This is especially important when multiple waste families and high-value batches are processed on the same installation.
1
Recipes
Temperatures, dwell times, air settings and sequences defined for each product family.
2
Batch tracking
Batch identification can be associated with cycle parameters where internal traceability requires it.
3
Process parameters
Temperatures, pressure, oxygen, flows, consumption and peripheral-equipment status.
4
Data logging
Trends, events, alarms and exports used for operation, maintenance and recipe improvement.
Retrofit & modernisation
Upgrade an existing installation without losing control of the batches.
CFI Systems can audit an existing firing, calcination or thermal-treatment installation dedicated to precious-metal recovery and propose targeted improvements to safety, recipes, loading, cooling, filtration or automation.
The retrofit scope is built around actual operating constraints and compatibility with the equipment retained.
01PLC, HMI, supervision and batch history
02Air / temperature / negative-pressure control
03Loading, extraction and support cooling
04Afterburning, gas cooling and filtration
05Improved access and maintainability
Custom sizing
Start from the real waste and the downstream refining route.
CFI Systems does not freeze a product range before the requirement has been characterised. Chamber size, load support, heating method, recipes and filtration are defined from the materials actually processed.
1
Characterise the streams
Composition, moisture, calorific value, particle size, metal content, dust and contaminants.
2
Understand the recovery target
Target metals, required calcination level and downstream analysis / melting / refining route.
3
Define the batches
Containment, segregation, frequency, mass, throughput and traceability rules.
4
Size the thermal line
Chamber, heating, air, afterburning, cooling, filtration and extraction.
5
Integrate handling
Loading, transfer, hot zone, cooling and ash recovery.
6
Validate & optimise
Testing, recipes, supervision, training and performance optimisation in operation.
CFI Systems approach
Performance is measured not only by combustion, but by the material recovered.
In a precious-metal recovery installation, dust lost into a duct can have a value completely disproportionate to its mass. CFI Systems therefore integrates material-transfer control, fine-particle collection and batch traceability into the design from the outset.
Less aggressive firing can help recover more.
Air velocity, heating method, tray geometry, cooling and filtration are coordinated to preserve the recoverable fraction throughout the process.
01 · MATERIAL
Preserve value
Limit carry-over and collect dust that may still contain recoverable metal.
02 · BATCH
Avoid cross-mixing
Physical segregation, dedicated supports and cycle history according to site procedures.
03 · PROCESS
Adapt the recipe
Temperature, air and duration adjusted to the organic matrix and target metals.
04 · EMISSIONS
Treat without losing
Afterburning and filtration designed for both environmental performance and recovery of fines.
Frequently asked questions
Precious metal recovery furnaces.
A thermal recovery installation must be designed around the waste, the metal to be recovered and the refining process that follows.
What is a precious metal recovery furnace used for?
It thermally removes organic material from production waste or residues so that mineral and metallic constituents become concentrated in ash or solids that can then be analysed, melted or refined.
Which metals can be concerned?
Depending on the stream, this can include gold, silver, platinum, palladium, rhodium and other valuable metals. Process suitability always depends on the real composition of the waste.
Which types of waste can be processed?
Polishing residues, floor sweepings, wipes, PPE, filters, resins, sludges, salts, catalysts, workshop consumables and selected electronic or industrial residues can be studied. The exact list depends on the site permit and waste characterisation.
Why process batches separately?
Segregation preserves material traceability and avoids mixing streams with different grades or compositions. It also makes sampling, analysis and financial settlement of the batch easier downstream.
How can precious-metal loss into the flue gas be limited?
Through suitable chamber design, controlled air velocities, appropriate heating and load supports, followed by high-performance filtration capable of capturing any fine particles that are entrained.
Does the furnace directly refine gold or platinum?
No. The furnace is a thermal pretreatment step. The resulting residue is then routed to grinding, sampling, melting, chemical treatment or refining operations suited to the material.
Can loading and cooling be automated?
Yes. Depending on throughput, trays or carts can be transferred by conveyor or another mechanised system, with a protected cooling zone before operator handling.
What flue-gas treatment is required?
It depends on the waste and regulatory requirements. The line can combine afterburning, cooling, acid-gas neutralisation, particle filtration, adsorption of specific pollutants and emissions monitoring.
Can energy be recovered?
Yes, where thermal duty, operating hours and site demand justify it. Heat recovery must remain compatible with the temperatures required for effective flue-gas treatment.
Can CFI Systems modernise an existing installation?
Yes. An audit can cover recipes, automation, loading, safety, cooling, afterburning, filtration, extraction and energy recovery.
CFI Systems
Precious metal recovery is part of a broader industrial thermal-process capability.
CFI Systems also develops cremation systems, incineration systems, thermal cleaning & paint stripping ovens, pyrolysis furnaces, as well as combustion, flue-gas treatment and energy-recovery solutions.
Explore all our solutions
Precious metal recovery project
Tell us about your residues, batches and recovery objective.
Jewellery residues, polishing waste, catalysts, filters, sludges, resins, salts, components or other industrial residues containing precious metals: CFI Systems studies the furnace, handling, cooling, flue-gas treatment and automation as one integrated system.
contact@cfi-systems.com
Centre d’Affaires Giennois – Bureau B9 · 1 rue Antoine de Lavoisier · 45500 Gien · France
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