Solutions

In the manufacturing processes of electronics factories, the acid and alkaline waste gases generated during the surface cleaning of electronic products can cause chronic or acute poisoning in humans.

This paper discusses the process design for recovering palladium from waste catalysts in coal chemical industry, mainly including the following aspects:

Plating platinum group metals (PGMs) onto other metal substrates to replace monolithic PGM components can significantly reduce material usage. Pt, Pd, and Rh plating are particularly common.

In most cases, the collected waste alloys have multiple sources and complex compositions, requiring processes such as re-dissolving into a solution, separating impurity elements, separating platinum group metals from each other, and refining to obtain pure metals.

Waste membrane electrodes can be treated by incineration, chemical dissolution of organic compounds to strip the catalyst, crushing followed by magnetic separation, etc., to recover the Pt (or Pd).

Recovery of Ru from Ru/C and Ru/MgO spent catalysts: Ru/C and Ru/MgO catalysts, with their high catalytic activity and ability to reduce the working pressure and temperature of ammonia synthesis, are widely used in the ammonia synthesis industry.

In the production of platinum-based anticancer drugs (cisplatin and carboplatin), silver iodide residue containing 5-8% Pt is generated, with Pt dispersed in the silver iodide as fine particles.

Cleaning equipment rust is an important measure for recovering precious metals. One method is to soak certain detachable parts in a 10% phosphoric acid solution in a plastic tank for at least 36 hours to remove and recycle the rust.

Platinum-rhodium crucibles, spinnerets, and filament spinnerets used in the melting of glass and glass fibers are subjected to long-term use at high temperatures of 1200-1300℃. Some platinum and rhodium are oxidized to PtO2 and Rh2O3, which volatilize and permeate into the refractory bricks of the furnace or are embedded in the glass slag.