Spent petroleum-reforming catalysts can retain platinum on an alumina-based support together with coke, sulfur, chlorides and process contaminants. Platinum value creates a recovery opportunity, but catalyst history and pretreatment strongly influence leaching. Published research has combined biologically produced oxalic acid with mineral acids in hybrid platinum recovery. The reported recovery was partial, so the work is best treated as screening evidence rather than a commercial guarantee. An industrial program must determine whether oxalic acid improves liberation or complexation, quantify reagent and energy demand, protect operators from catalyst dust and close the platinum balance through final refining.

a peer-reviewed Waste Management study provides the application evidence used to frame this qualification guide. Published conditions are specific to the studied feed and equipment and must not be treated as guaranteed plant performance.

For industrial qualification, assign named owners in process engineering, metallurgy, quality, purchasing, production and EHS. Approve the sampling plan, oxalic acid specification, solution-preparation method, dosing basis, retained-sample period and deviation response before the first plant trial. Compare representative reagent lots under identical operating conditions and record mass balance, concentrate or product quality, waste load, utilities and equipment observations. Review packaging, storage humidity, unloading, dust control and solution concentration alongside supplier laboratory data. Define who may change a dose or trial boundary and what evidence is required before scale-up. Where buyer and supplier results differ, compare sampling point, moisture basis, analytical method, calibration, detection limit and uncertainty before disposition. Oxalic acid is corrosive and harmful if swallowed or inhaled as dust; current SDS information, local regulations and site procedures remain controlling. Use enclosed charging where practical, compatible equipment, local exhaust, approved PPE and secondary containment. Confirm emergency isolation, eyewash and shower access, spill response and worker training before commissioning. Inspect bags, pallets and seals on receipt and quarantine wet, damaged or unidentified material. Verify solution strength before dosing and reconcile delivered, stored, dissolved and consumed mass. Record water quality, ambient conditions and operator changes that could confound a trial. Close every trial with an authorized report, updated specification, routine monitoring plan and requalification triggers. A promising extraction or flotation result does not by itself establish commercial suitability: product purity, reagent consumption, water recycle, residues, emissions, corrosion, energy and economics must be considered together. Supplier scorecards should include COA trends, delivery condition, change notification and corrective-action quality as well as price. Validate contingency supply before a disruption using the same ore, residue or catalyst and the same acceptance criteria. These controls turn laboratory research into an auditable development package and help buyers compare technical offers on a consistent basis.

Characterize each catalyst family

Record refinery service, support composition, platinum loading, promoter metals, coke, sulfur, chloride, moisture and prior regeneration. Separate lots with different catalyst formulations and operating histories.

Define the recovery endpoint

Set targets for platinum extraction, concentrate grade, downstream refinery acceptance, alumina residue and regulated impurities. Dissolved platinum is not final recovery until captured in an acceptable product.

Use literature as screening evidence

A peer-reviewed Waste Management study evaluated oxalic acid produced by Aspergillus niger in hybrid leaching of a spent refinery catalyst. Its catalyst and conditions require independent reproduction.

Compare chemical and hybrid routes

Run controlled tests with oxalic acid, approved co-reagents and suitable blanks. Vary pulp density, pH, temperature and time while holding particle preparation and catalyst lot constant.

Account for pretreatment effects

If decoking, roasting or washing is considered, measure platinum loss, off-gas, chloride, sulfur and support changes. Treat pretreatment as a separate unit operation with its own safety and environmental review.

Close platinum and support balances

Analyze feed, residue, pregnant liquor, washes and recovered concentrate with validated methods. Include solution retained in filter cake and sampling uncertainty when reporting recovery.

Design downstream capture and recycle

Test adsorption, precipitation, solvent extraction or another approved platinum capture step with actual liquor. Verify selectivity over aluminum, iron and promoter metals, then test reagent recycle through multiple campaigns.

Manage residue and exposure

Use enclosed catalyst handling, local exhaust and approved PPE. Assess acid compatibility, ventilation and secondary containment. Characterize spent support, washes and purge before selecting disposal or reuse routes.

Control oxalic acid raw material

Specify hydration state, assay basis, insolubles, iron and trace metals relevant to platinum purification. Compare several acid lots in the same standardized test and retain matched samples.

Prepare a refinery-catalyst inquiry

Share catalyst type, trial scale, acid specification, package, destination and forecast. Review the Hiacid oxalic acid page, then contact the export team for pilot supply.

Related oxalic acid resources

• Oxalic Acid for Bismuth Recovery from Blast Furnace Dust
• Oxalic Acid Pretreatment for Low-Grade Bauxite Flotation
• Oxalic Acid for Galena and Sphalerite Selective Flotation

Frequently asked questions

Is oxalic acid alone guaranteed to recover platinum?

No. Performance depends on catalyst support, service history, pretreatment and the complete hybrid flowsheet.

Why separate catalyst families?

Different supports, promoters, coke and chloride levels can change leaching and downstream purification.

Can dissolved platinum be reported as recovered product?

No. Final recovery must include capture, purification, washing and an acceptable product.

What safety issue is often overlooked?

Fine spent-catalyst dust and residues may contain hazardous constituents and require controlled handling.