Process for the recovery of noble metals and tertiary phosphines

Details Process for the recovery of noble metals and tertiary phosphines Process for the recovery of noble metals and tertiary phosphines

1992-12-31

1994-02-01

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C22B 1104

Patent

active

052828840

ABSTRACT:
The present invention concerns a process for the recovery of a noble metal from an inorganic and/or organic residue in the form of a tellurium
oble metal precipitate characterised by adding a solvent having a boiling point above 120.degree. C. to the residue, removing by distillation water and other residual solvents having boiling points below the boiling point of the added solvent, adding the tellurium or reducible tellurium compound, and then refluxing at atmospheric pressure before separating the tellurium
oble metal precipitate. The process of the present invention also allows the simultaneous recovery of the tertiary phosphine as its oxide from a residue containing a tertiary phosphine by the further stages of concentrating the mother-liquors remaining after separation of the tellurium
oble metal precipitate, recovering the added high boiling point solvent and isolating the tertiary phosphine in the form of its oxide by precipitation with water.

REFERENCES:
patent: 4687514 (1987-08-01), Renner et al.
Hackh's Chemical Dictionary, ed. by J. Grant 4th edition, p. 33 (1972).

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