Determination method for gold and palladium in decoppered slag produced in wet treatment process for copper anode slime

Abstract

The invention discloses a determination method for gold and palladium in decoppered slag produced in a wet treatment process for copper anode slime. The method comprises the following steps: adding tartaric acid, thiourea and nitric acid into a sample, carrying out heating to a slight boiling for digestion, then carrying out filtering and washing filter residues; transferring the filter residues and filter paper into a crucible for charring and ashing, adding aqua regia, carrying out heating to a slight boiling for digestion, then carrying out filtering and washing filter residues; and determining the contents of gold and palladium in the above two filtrates and subjecting the contents to addition. According to the invention, tartaric acid can eliminate interference of coexisting ions consisting of Fe ions, Pb ions, Zn ions and the like; thiourea can lower adsorption effect of a silver chloride precipitate on palladium; nitric acid is added in stages, which is beneficial for realizing complete digestion and improving the separation and enrichment effect of palladium; filter residues are subjected to ashing, so combustible components are oxidized and removed and only ash is left; and charring is carried out before ashing of the filter residues, so moisture in the sample is prevented from rapid evaporation and raising in the process of ashing, and incomplete ashing caused by coating of carbon particles is avoided. The method provided by the invention has the advantages of simple process, low cost, no pollution, high precision and accuracy of results, etc.

Description

technical field [0001] The invention belongs to the technical field of metallurgical analysis, and relates to a method for determining gold and palladium in copper-removing slag, in particular to a method for determining gold and palladium in copper-removing slag in a copper anode slime wet treatment process. Background technique [0002] Electrorefining is a technique that exploits the differences in the ease with which different elements dissolve anodically and / or precipitate cathodically to extract pure metals. During electrolysis, the crude metal to be refined obtained by high-temperature reduction is used as the anode, the pure metal is used as the cathode, and the solution containing the metal ion is used as the electrolyte, and the potential is controlled so that the inactive impurities whose dissolution potential is positive compared with the metal to be refined are insoluble in the electrolyte , finally remain on the anode or deposit in the anode slime and fall to t...

AI Technical Summary

Problems solved by technology

The traditional fire test gold method takes a long time, high cost, and large pollution, and the existing gold and palladium wet analysis patents do not solve the defect of silver chloride to palladium adsorption. The present invention provides a copper anode slime wet method Method for determining gold and palladium in decopper slag generated in treatment process

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