Classification,silver,Theconte business, insurance Classification of silver
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Thecontent of silver is very low in nature. According to the distribution of elementsin the crust, silver belongs to the trace elements, only about 20 to 30 timeshigher than gold on average. Silver ore resources can be divided intoindependent silver ore and associated silver ore, silver ore is mainly existedin the form of sulfide. Industrial minerals of silver are mainly having naturalsilver, argentite, stromeyerite, dyscrasite, stephanite and so on. While silverhas many industrial minerals, they are rarely integrated into single silverdeposit, usually distributed in polymetallic ore, copper and gold mine in adispersed state. More than half of the silver outputs are from thecomprehensive recovery of polymetallic ore. All of the assay methods ofanalytical chemistry have been applied to the silver determination, includinggravimetry, titration, spectrophotometry, fluorescence method, chemical powermethod and so on, in which the advantages of atomic absorption spectrometry arethe most prominent. Atomic absorption spectrometry measures silver issensitive, accurate, fast, simple and less interference. Therefore, it obtainsa wide range of applications. Silverconcentrate is the intermediate product of the nonferrous metals industry'sproduction process, to determine the quality silver and the content of therelevant elements have an important role in the transaction of supply anddemand sides and the production process determined. The main determinationelements except for silver, there also have gold, copper, arsenic, bismuth,lead, zinc, sulfur, aluminum and magnesium. Currently,the determination of silver and gold content mainly use the most classic fireassay gravimetric method, generally has secondary gold recovery; determinationof copper content, high levels adopt iodimetry, low levels adopt atomicabsorption spectrometry; determination of lead and zinc, high levels adopt EDTAtitration, low levels adopt atomic absorption spectrometry; determination ofarsenic content, high levels adopt potassium bromate titration, low levelsadopt atomic fluorescence spectrometry; determination of sulfur content, adoptbarium sulfate gravimetric method and combustion method; determination ofbismuth content, mainly the atomic fluorescence spectrometry; determination ofaluminum, there is spectrophotometry and EDTA titration; determination ofmagnesium, generally using atomic absorption spectrometry. Coarsesilver mainly refers to the silver ore which contains 30%-99.9% of the silver,smelting primary silver products and recycling silver. The crude silver scopeis relatively wide, resulting in diversity and complexity of the productspecies. In the crude silver, except for those relatively simple compositionand known quality recycled silver products can be directly used, others areusually required by refined, concentrated integration of corresponding valuemetal elements. In addition to a variety of precious metal components whichcoexist with coarse silver, it also contains a lot of metal and non-metalcompounds and other substances which have the recovery value. Furthermore, dueto its quality spans are getting bigger, it both have silver concentrates,monetary silver and all kinds of relatively low quality silver mining as wellas industrial intermediate products. Puresilver is produced by a variety of silver-containing materials, which thesilver content is 99.90%-99.99%. Pure silver is mainly used in photography,chemical reagents, chemical materials, medicine, electronics, decor, jewelryand silver products and other industries. Silver is the most widely used metal powder in the electronics industry. In recent decades, with the progressof science and technology, especially the rapid development of the electronicsindustry, the preparation of silver was made considerable progress in both thetechnology and equipment, it was already quite mature. Article Source:http://www.mhcmp.com
Classification,silver,Theconte