What Is Assaying?
Assaying refers to the process of subjection of a metal to element chemical analysis in order to determine the potency and superiority of its components. This is one of the progressions in metallurgy. It is a procedure of extracting valuable or indispensable metals form their ores. An ore is an amalgamation of numerous metals. Some of them are found in traces. Assaying analyses the precise metallic substance of the ore, alloy or any other amalgamation of metals.
This whole process can be simple as well as complex. If the complex process is followed, the ore is subjected to complete metal analysis. However, in the simple process, the quantity of only one or two specific metals is measured.
In the assaying technique, when the weight of the metal is measured it is called gravimetric assay. Usually wet assay technique that employs the liquid reagents is used in such analytical process. When the volume of the metal is under consideration, it is called volumetric assay. The dry assay utilises the process of fusion of the ore to get the metal in a pure state.
There are numerous conventional and complicated methods used in the assaying procedure. The earliest alchemists and the goldsmiths engaged the means of subjection of the base metals to high temperature. This procedure is termed as fire assaying. This conventional process is still well-liked among the business-related reefing processes. The other complicated method is by means of spectrometric analysis. It has its own significance, but it is not appropriate when the valuable metals are haphazardly spread. As in this case, huge sample is subjected to examination.
The traditional and the most commonly used fire assaying method involve six steps. The first step is the collection of the sample. The collected sample is then subjected to the fusion process. This includes the melting of the ore and its mixing with the other reagents. Thus, metal gains the shape of droplet. This droplet then easily descends into the crucible. The left over material is called slag which is ejected through an outlet.
The impurities are oxidised by means of assured reagents. These impurities mostly comprise lead and iron. At the elevated temperature, the left over valuable metals such as gold and silver presume the form of a droplet. The next significant measure is the weighing of these beads. All the beads are weighed to determine the amount of the valuable metal in the ore.
The next step is the entity extent of the mass of gold and silver. For this reason the silver is dissolved by means of nitric acid. Now the left over gold beads are calculated. This is the heaviness of the gold. The heaviness of silver is calculated by subtracting gold weight form the whole gold silver weight.
There are very high chances that the molten impurities will get mixed with the gold silver beads. In order to eliminate such chances, further specification is made by the use of arc spectrograph. This separates the gold and other impurities based on their mass to charge ratio. A graph is obtained that shows the percentage of gold, silver, and other impurity metal present in the ore. Other metals including bismuth, tin, antimony, and copper can also be analysed by this method.
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