Matthey Rustenburg Refiners (Proprietary)

Johnson Matthey & Co., Limited

Matthey Rustenburg Refiners, Limited

John James MacGregor

John Blunden Payne

Walter Westwood

A process for recovering platinum group metal present as a stable complex dissolved in an aqueous effluent from a platinum group metals refinery which comprises (1) adjusting the pH of the effluent to an alkalinitz of at least 10; (2) heating to above 60.degree. C.; (3) electrolyzing the effluent at said alkalinitz and temperature using an anode potential having a half-cell voltage of at least 7.5 volts and current density of at least 0.2 A/cm.sup.2 so as to break down said complex by anodic oxidation and precipitate metal present in the complex; and (4) filtering off the precipitated metal.

Treatment of effluents

A process for recovering platinum group metal present as a stable complex dissolved in an aqueous effluent from a platinum group metals refinery which comprises (1) adjusting the pH of the effluent as necessary to an alkaline pH of at least 10; (2) heating the effluent to a temperature above 60.degree. C; (3) electrolyzing the effluent at said temperature and alkaline pH using an electrode comprising at least one metal selected from the group consisting of Ru, Rh, Pd, Ir, Pt and alloys thereof at an anode potential having a half-cell voltage of at least 7.5 volts and a current density of at least 0.2 A/cm.sup.2 so as to break down said complex by anodic oxidation and precipitate metal present in the complex; and (4) filtering off the thus precipitated metal.

This invention relates to an improvement in the well known 'Bayer' process. In particular, the invention describes a process for the recovery of gallium and alumina from bauxite including the steps of:

Recovery of gallium

This invention relates to the separation and purification of platinum group metals and, in particular to the separation of mixtures of rhodium, platinum and irridium. According to one specific form of the invention, the platinum, rhodium and iridium are present as salts in aqueous solution and the separation and purification is accomplished by

Refining of noble group metals

This invention relates to the recovery of gallium from scrubber dust containing aluminum and fluoride. In carrying out the process of the invention gallium is recovered from a particulate solid of the basic material by means of a process comprising the following steps:

This invention relates to a process for the separation and purification of platinum group metals and particularly platinum, rhodium and iridium. Essentially the platinum group metals are present as salts dissolved in an aqueous solution and the process for separating and purifying the platinum group metals comprises, according to one embodiment of the invention, the following steps:

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London, United Kingdom

John James MacGregor