Reagents for gold

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flotation reagents for gold  Assay is the oldest and most reliable method for the determination of gold and silver in concentrate or samples. This method is still the industry standard and includes smelting sample, which is mixed with lead oxide.

At the beginning of the grinding occurs ground ore samples. These samples were weighed and added to the crucible. In a mixture of lead oxide called pour reagents for gold – quartz sand, borax, and sometimes fluorite. All mixed and put in a muffle furnace. In the furnace the entire contents of the crucible is melted. The molten mass is pulled out of the furnace and poured into a conical shape. Molten lead, gold and silver are deposited on the bottom of the mold, while the remaining components of the ore are converted to vitreous slag that floats on top. After cooling, the metallic lead portion in the bottom forms glassy slag is discarded.

flotation reagents for gold

Metal buttons lead placed in the font and then in oven. In the process of melting metal reconverted into oxide, which is separated from the precious metals and absorbed into bone ash bowl, leaving a small amount of precious metal – metal “ball”. Next on the microbalance occurs weighing gold and silver, to determine their weight in the initial sample of ore. “Balloon” is then heated in a hot nitric acid which dissolves silver, leaving the gold, which is possibly present. In more modern laboratories, ball made of precious metals, dissolved in aqua regia. The resulting solution is then analyzed by atomic absorption spectrometry, which allows to define a class of gold and silver in the original sample.

Assay is a science, and to some extent even in art, because some types of ores contain elements that can significantly affect the outcome. Only a professional knows how to change reagents for gold to avoid problems, how to determine the content of gold and silver per ton sample. Fire assay method is also known as a method of cupellation. This is perhaps the most accurate method of testing the amount of content of gold. Fire assay method is a standard procedure used in national laboratories worldwide for marking, and is part of the international standard ISO 11426:1993.

Fire assay method gives an accuracy of 2-3 parts per ten thousand (0.02%) – the most accurate method for testing the purity of gold. Hallmarking of precious metals and jewelry is often made depending on the requirements of the law at the place of manufacture or import of metals and jewelry. If the state or country requires that the precious metals were tried out, these conditions must be fulfilled regardless of the country of production. In general, different countries have different legal requirements or acceptable subtleties to clean precious metals. Thus, the country assumes the right to indicate the purity of the metal products. Fire assay results will be reflected by punching test, for example: 750 for 18 carat gold, etc. Cupellation method can be used mainly for testing bullion and gold stocks, in contrast to the analysis of works of art or jewelry.