Method of determining silver content in rock minerals

Abstract

The invention discloses a method of determining silver content in rock minerals. The method comprises the following steps: preparing a silver standard storage solution; preparing a silver standard solution; determining absorbance of the silver standard storage solution by using an atomic absorption spectrometer and a silver hollow cathode lamp and drawing a working curve; taking a sample; adding nitric acid, hydrochloric acid, hydrogen peroxide, an ammonium fluoride solution and a sodium chlorate solution, carrying out microwave digestion, heating and drying an obtained mixed solution with steam, adding hydrochloric acid and nitric acid, dissolving solids, transferring an obtained solution to a volumetric flask, diluting the solution with distilled water until the liquid level of the solution reaches a scale mark, shaking up the solution, determining absorbance of silver in the obtained sample solution by using the atomic absorption spectrometer and the silver hollow cathode lamp, carrying out blank tests on associated samples, and calculating the concentration of silver in the sample according to a formula. The invention has the advantages of convenience, fastness, a small usage amount of reagents, low cost for determination and no discharge of a great amount of acid gas, is favorable for protecting environment and health of operational personnel, avoids loss of the sample inthe sample solution, enables precision of analysis to be enhanced, labor intensity to be reduced, time to be saved and work efficiency to be improved, and has a wide application scope.

Description

technical field [0001] The invention relates to a method for determining silver content, in particular to a method for determining silver content in rock minerals. Background technique [0002] Silver is an important metal for industry and people. For many years, the international supply has been in short supply and the gap is large. The same is true in my country. It is listed as one of the scarce resources. In recent years, many scientific research institutions have devoted themselves to analyzing the determination method of silver content in rock minerals. Coexisting with metal compounds such as copper, lead, and zinc, there are many small deposits containing trace amounts of silver, making it difficult to mine. Different measurement methods must be used for different types of ores. At present, the chemical analysis method for determining the amount of silver in zinc concentrates is as follows: according to the "sample amount" corresponding to the "silver content" in Tabl...

AI Technical Summary

Problems solved by technology

Although this method can effectively determine the silver content in zinc concentrate, the scope of application of this method is relatively narrow, and it can only be used for zinc concentrate

Furthermore, in theory, hydrochloric acid should be added first to remove sulfur, but in actual operation, adding hydrochloric acid first will easily form sulfur blocks, resulting in incomplete dissolution of the sample; silicon compounds in the sample cannot be effectively dissolved; the sample contains organic matter that cannot be removed. , leading to low analysis results; in the experiment, the degree of "heating and steaming to near dryness" is not easy to grasp, and silver-chloride anions are not easy to form, and silver chloride precipitation is easy to form

Adding 20% ​​(accounting for the total volume of the test solution) of hydrochloric acid corrodes the atomic absorption spectrometer seriously, and the cost is high

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