Method for recovering platinum from silver electrolyte

Abstract

The invention discloses a method for recovering platinum from a silver electrolyte. In the invention, reducing silver powder is directly added into an electrolyte for replacement to recover the platinum concentrate without heating or regulating the pH value; and thus, the invention is simple to operate. The reducing silver powder only replaces the platinum, but does not replace palladium and other metals, and thus, the invention has the advantages of favorable platinum selectivity and complete replacement. In the platinum replacement process, no other ions or impurities are introduced, the electrolyte after separating the platinum can be used repeatedly, and the precipitated platinum concentrate only contains excessive silver powder and slight amounts of other impurities, thereby shortening the subsequent platinum purification process and enhancing the recovery rate of platinum (up to higher than 98%).

Description

Technical field:

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for recovering platinum from silver electrolyte. Background technique:

[0002] About 50-60% of the platinum in the anode of the silver electrolysis process enters the electrolyte. One of the traditional recovery methods for platinum is to use activated carbon to adsorb, but there are the following disadvantages: the activated carbon needs to be pretreated and regenerated; the electrolyte needs to be heated to At 80-90°C, sodium hydroxide needs to be heated to adjust the pH to 1.5-1.8, and the accumulated sodium ions will affect the reuse of the electrolyte after platinum precipitation; the adsorption capacity of activated carbon is small, and the adsorption efficiency is not high; Activated carbon not only adsorbs platinum, but also adsorbs metals such as palladium, silver, and bismuth, which has poor selectivity and makes subsequent purification more di...