Rapid determination method for gold in lead concentrate by adopting flame atomic absorption spectrometry
A flame atomic absorption and rapid determination technology, applied in the field of analysis and testing, can solve problems such as being unsuitable for popularization and application, cumbersome operation steps, incomplete precipitation, etc., and achieve the effect of reducing chemical reaction process and operation process, saving time, and reducing strength.
Inactive Publication Date: 2013-06-19
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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This method has cumbersome operation steps, and is easily polluted and incomplete during the precipitation process, so it is not suitable for popularization and application.
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[0020] A kind of flame atomic absorption spectrometry is to the rapid determination method of gold in lead concentrate, used equipment instrument: M6 atomic absorption spectrophotometer; Gold hollow cathode lamp, concrete steps are as follows:
[0021] In the first step, weigh 10g of lead concentrate sample into a 250~300mL polyethylene plastic bottle, add 4~5mL of water to moisten it, and the ratio of the volume of water added to the mass of the sample is about V:m=1 : 2. Shake the plastic bottle so that the ore sample is spread on the bottom of the bottle;
[0022] In the second step, 30 to 35 mL of concentrated nitric acid is added in stages to the moist lead concentrate sample obtained in the first step, generally 10 mL is added each time, and the mass ratio of the volume of the added concentrated nitric acid to the sample is V:m=3:1, Dissolve the lead concentrate ore sample in a boiling water bath at 95-100°C, and wait until the lead concentrate sample system with concent...
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The invention relates to the technical field of analytical test and in particular relates to a rapid determination method for gold in lead concentrate by adopting a flame atomic absorption spectrometry. The rapid determination method provided by the invention comprises the following concrete steps of: firstly adding concentrated nitric acid to oxidize an ore sample, so that massive sulphur is oxidized into sulphate ions to be removed, a lead nitrite solution is also generated, formation of massive lead chloride precipitate when chloroazotic acid dissolves the ore sample is avoided and encapsulated gold is exposed; then hermetically dissolving the ore sample by adopting potassium chlorate-ammonium hydrogen fluoride, so that chloric acid generated after potassium chlorate reaction has strong oxidability, ammonium hydrogen fluoride can decompose gold encapsulated in silification minerals such as quartz and the like, the ore sample can be thoroughly decomposed when chloric acid and ammonium hydrogen fluoride are combined under the hermetically sample dissolution condition and the gold in the ore sample can be completely dissolved; and carrying out an inverse dissolution reaction in a boiling water bath, separating and enriching with activated carbon, and then adopting an atomic absorption method. The rapid determination method provided by the invention has the advantages of less interference, low detection limit, no roasting on the ore sample, direct sample weighing and sample dissolving, easy and quick operation, high efficiency and low cost and is especially applicable to determination of samples in batches.
Description
technical field [0001] The invention relates to the technical field of analysis and testing, in particular to a flame atomic absorption spectrometry method for detecting gold in lead concentrates. [0002] Rapid assay method. Background technique [0003] Lead concentrate is one of the important raw materials for industrial production. Usually, different types of lead concentrates contain a certain amount of precious metal elements such as gold and silver. YST319-2007 stipulates that gold and silver should be reported as valuable elements. The main component of lead concentrate is galena. For the analysis and determination of gold in lead concentrate, the primary problem is how to eliminate the interference and influence of sulfur and lead in the ore sample. [0004] For the analysis of gold in traditional conventional ore samples, for sulfur-containing carbon samples, the commonly used method is to roast at a high temperature of 650~750°C first, and then use aqua regia to ...
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Inventor 邵坤刘卫范建雄李可及
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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