Precautions for fire assay operation
Release time:
2020-08-25
Fire Assay It is a classic chemical method that applies chemical methods and technical analysis to statistical analysis. It has advantages such as wide acceptability and ease of use, and is a key technical method for the research and analysis of the chemical composition of gold, silver and precious metals. It is a common method to improve the measurement of gold and silver in mineral and metal composite materials. Legal recognition of gold and silver in lead concentrate fire assay. The principles involved, the testing process, the effectiveness and practicality of each process are consistent.
Fire Assay Principle, Fire Assay Method It is a method of using solution smelting of iron ore and metallurgical machinery industrial production to achieve quantitative research and analysis, which can measure the content of precious metals included in it. In practical applications, the lead assay method is dominant, and the whole process is divided into 3 stages 。
Smelting, it relies on solid experimental reagents mixed with the sample, heated and melted in a crucible, and uses lead to capture gold, silver and precious metals under melting conditions to produce lead alloy, because the specific gravity of lead alloy is very large. It moves down to the bottom of the crucible. In addition, metal oxides and gangue in the base metal react with solutions such as silica, borax and carbonate to form slag, such as aluminum silicate or borate, which floats on the surface of the sample in a small proportion, thereby extracting gold and silver from the sample.
Fire Assay Cupellation of the lead alloy at a moderate temperature to remove lead by cupellation. When the cupellation air lead oxide is reduced to lead oxide, it is obtained in the cupel and penetrates the porous structure of the cupel, then to the lead lead bond and a small amount of alkali added metal materials, gold, silver and precious air oxidation, protection and production of silver particles together stay cupel.
Fire Assay Gold separation, to melt gold and silver particles, so that silver melts, while gold can still maintain the enterprise solid, the obtained gold particles are heat-treated and weighed, the content can be calculated and withdrawn, according to the difference between the quality of Chinese gold and silver particles and the quality of gold, the content of silver can be calculated.
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