Analytic method of trace gold contained in composition brass

Abstract

The invention discloses an analytic method of trace gold contained in composition brass. The analytic method of the trace gold contained in the composition brass is characterized by comprising the following steps of: grinding a sample to be powdery, weighing 1-10 grams, placing into a beaker, and adding a nitric acid solution at the volume ratio of 50%; after reaction, heating, and boiling; dissolving during micro-boiling for about 10 minutes, and taking out for cooling; filtering through a quantitative low-speed filter paper, cleaning the beaker by using deionized water, and totally transferring cleaning liquid to a filter funnel; then cleaning depositions for three times by using the deionized water, and transferring the filter paper and filter residues together into the beaker used for originally dissolving the sample; adding aqua regia, and heating; dissolving during micro-boiling till the volume of the solution is about 5-10mL, and taking out for cooling; carrying out dry filtering by using a volumetric flask with the constant volume of 25-1000mL and a core funnel; measuring the light absorbance of filter liquor by using an air-acetylene flame atomic absorption spectrophotometer; and computing the mass concentration of the gold according to a standard working curve method. The method disclosed by the invention has the advantages of ideal separation effect, accurate analytic result, good reproducibility and easiness and fastness for operation; and compared with the traditional fire assay, the method has the advantages of cost conservation, equipment, namely a high-temperature furnace, a cupellation furnace, and the like, conservation, lead pollution prevention and environment friendliness.

Description

technical field

[0001] The invention relates to a chemical analysis method, in particular to a chemical analysis method of trace precious metal elements. Background technique

[0002] Miscellaneous copper is produced by pyromelting copper-containing waste. In addition to copper as the main component, it also includes a large number of other metals, such as: iron, lead, nickel, tin, etc., and also contains trace amounts of gold, palladium, silver and other precious metals. Due to the high price of precious metals, gold is an important pricing element in miscellaneous copper trade, and its analysis results are also one of the basis for evaluating the recovery rate of metallurgical processes, so accurate and rapid determination of gold content is of great significance. At present, the classic method of determining gold is the lead fire assay. The detection of gold in blister copper generally adopts the national standard YS / T521.3-2006, and its principle is an ancient and clas...

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