Zinc Mining in Ancient India
A measuring microscope may be used in the study of metallurgy. In research, metallurgy electronics, semi-conductors and crystals may be observed under a measuring microscope in order to observe such metal objects.
Zinc is a chemical element with a moderately-reactive bluish-white shade. When exposed to air, zinc tarnishes in moist air. It turns a bright bluish-green flame when burned and produces zinc oxide. Zinc reacts with substances like acids, alkalis and other non-metals.
The zinc metal has been known to be unique in the country of India. As such, ancient mine workings and distillation furnaces have become evidences that ancient India had the some technical knowledge, albeit simple and not complex, before the industrial revolution.
It was ancient Indian people who had pioneered the zinc extraction in the world. Such claim was corroborated by the existence of ancient mine workings, smelting or metallurgical sites and artifacts. There has been the recovery from archeological sites in the country of zinc-based alloys like brass. In the northwestern part of the country, the state of Rajasthan is known to be the site of ancient zinc-lead mines. Another location is Zawar, which is located 45 km south of Udaipur City. This was said to be the major site for a then considered as advanced zinc mining and smelting activity. This has lead to the reputation of the present Rajasthan as the India’s principal producer of zinc and lead.
Ancient Indian literature has even recorded a breakthrough in zinc extraction in those days. Such process included high temperature distillation that was developed and then applied in future zinc extraction and purification from their metal ore sources. Zinc ores were broken with the use of iron hammers or pestles. Then, such broken ores were again crushed by larger pestles. Then, the ore would have to be thoroughly roasted in order to reduce the levels of sulphur. After which, a high proportion of calcined dolomite was mixed with the crushed and roasted ores. An interesting ingredient in this process is the addition of common salt. This is for the reason that salt would help in the distillation process, thereby, producing soda vapor that assists in amassing calcium and magnesium oxides. This allows zinc vapor to freely flow and increasing zinc yield. This zinc yield was poured on clay containers for heating.
With the use of measuring microscope for metallurgical purposes, the degree of fusion of clay and other minerals can be determined today from the artifacts recovered from such ancient mining factories. Archeologists from the British Museum have approximated the temperature used in such ancient furnaces have been around 1150 to 1200 degrees. Furthermore, researchers roughly estimated zinc production to be around 400,000 tonnes the daily and the peak of such activity was between 1300 and 1600 AD.
The main reason for the mining and production of zinc metal was said to be for the preparation of the zinc and alloy copper known as brass. Brass is used to make domestic tools and casting of religious images.
