Practice 06 / Specialised Technical Consulting

Specialised Technical Consulting.

We design, build and hand over processing plants that turn aluminium dross residue and spent pot lining into saleable materials. We take responsibility for the waste from the smelter floor to the final product, with zero landfill as the design target.

06

Specialised Technical Consulting

Specialised technical consulting for aluminium smelters

Hazardous smelter waste, engineered into product.

Product mix is set per plant by the chemistry and volume of the client's waste.

3Dross valorisation plants designed, built and operated in South Africa
35+Years of engineering in pollution control and dross processing
8Integrated deliverable streams, from feasibility to handover
0Tonnes to landfill: the design target for every plant
Two waste streams, one discipline

We work with both sides of the aluminium industry

Primary and secondary smelters produce different residues, but they share the same problem: a hazardous material that costs money to store, transport and landfill, and that stays the generator's liability for decades.

Primary smelters

Spent pot lining (SPL)

The carbon cathode and refractory lining removed from reduction cells at the end of their life. SPL carries leachable fluorides and cyanides and is classified hazardous in most jurisdictions.

  • MaterialFirst-cut carbon and second-cut refractory SPL, including legacy stockpiles
  • RiskFluoride and cyanide leaching, flammable gas on contact with water
  • OutcomeTreated, inert material and product streams for cement, steel and agriculture
Secondary smelters

Aluminium dross residue

What remains after metal is recovered from dross and scrap melting. The residue holds salts, aluminium nitride and fluorides that react with moisture and leach into soil and groundwater.

  • MaterialSalt cake and non-metallic dross residue from rotary and reverberatory furnaces
  • RiskAmmonia release, chloride and fluoride leaching, rising landfill costs
  • OutcomeAmmonium sulphate, pozzolans, calcium aluminates and recycled salt flux
Cradle to grave

One accountable partner from first sample to handover

Each project moves through five stages, with a client sign-off at every gate. We stay involved after handover for as long as the plant needs us.

1

Assess

Dross or SPL analysis, valorisation strategy and product mix scoping.

2

Design

Bespoke plant engineering matched to the residue chemistry, yield targets and market.

3

Build

Procurement and construction oversight with compliance at every stage.

4

Operate

Hands-on initial operation, mass balance setting and staff training.

5

Hand over

Full documentation, competency sign-off and ongoing support options.

What leaves the plant

Four product lines from one waste stream

A diversified product portfolio spreads market risk and gives the plant several sources of revenue instead of a single disposal cost.

(NH₄)₂SO₄

Ammonium sulphate

Fertiliser additive for agriculture.

SiO₂ · Al₂O₃

Pozzolanic additives

Lower-CO₂ supplementary material for cement and construction.

CaO · Al₂O₃

Calcium aluminates

Fused and sintered grades for steel and cement metallurgy.

NaCl · KCl

Salt flux

Recovered flux returned to aluminium smelters.

Start with the chemistry

Tell us what your smelter produces

A first conversation covers your waste volumes, the analysis data you hold, your site and your timeline. From there we propose an initial assessment.

Practice 06 / Specialised Technical Consulting

Discuss your waste stream

Tell us about your smelter and the residue it produces. We will come back to arrange an initial consultation, usually under a mutual NDA so technical data can be shared freely.

Email Finexfin

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Discuss your technical enquiry

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