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Processing Pure Tin by Claire Jarrett
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Processing Pure Tin |
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Manufacturing
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Tin is one of the basic chemical elements found naturally. Refined tin is a silvery-white material, which is popular to prevent other metals from corrosion. Very often this element is used to coat steel sheets and since it is not able to chemically react with any food material it is most popularly used to manufacture food containers. When combined with other metals like copper it is able to produce amalgams like bronze, and with lead it makes solder. Not only that, tin compound stannous fluoride is also used in toothpaste which prevents tooth decay. From historical data it has found that human civilization started using this element from 3500 B.C. or even before that. Basically this metal gets extracted from ore and depending upon the composition of ore the extraction process varies. In a few places this ore gets extracted through tunnels, a few use dredges or pumps to extract tin ore, but irrespective of the source the tin manufacturing process consists of several steps through which unwanted materials are chemically removed in order to get pure tin. As part of the tin manufacturing process, the first step tin is extracted through a mining process. Once gravel is located at or below water level it is brought up using a floating dredge. In case of gravel located at a dry area it is first broken up with jets and then using large nozzles it is extracted. This gravel is then taken to ore centers for cleaning. At first this gravel passes through a vibrating screening process and finally passed through a water filled tank where certain chemical processes are carried out in order to purify tin. Finally, this ore is dried and screened again and passed through a magnetic separator in order to separate out iron from the ore. Tin that comes out it is approximately 77% purified. This concentrated tin is then placed into a furnace along with coal or fuel oil. Sometimes limestone and sand may also use to react with impurities present in tin. This material is then heated to fourteen hundred Celsius temperatures and finally the silica and iron present in material get separated out forming a slag. This slag is then further heated in another furnace and repeats the same process of forming slag again. This process keeps on continuing repeatedly until hardened tin is obtained, which is known as crude tin. Tin has a lower boiling temperature when compared with other metals; hence this crude tin is then put in a furnace and here melted tin is collected. This melted tin then passed through compressed air and almost 99.8% pure tin obtained. This tin is then passed through a electrolytic process and remaining impurities like bismuth and lead finally removed from it and 99.99% pure tin is obtained from it. Tinware Direct are tin manufacturers and sell tins wholesale uk
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