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The truth is that the composition of a glass is not equal to that of a bottle . As explained
Ecovidrio 
. And it makes can not be cast in the same furnaces, glass bottles. "Our recommendation is that in the glass container glass deposit only", say from this organization responsible for the recycling of containers of this material in Spain. 
As further specified Alicia Duran, a research professor at the Institute of Ceramics and Glass (ICV
) of the Consejo Superior de Investigaciones CientÃficas (CSIC), glass-in fact, 'is Crystal'-quality glass containing high amounts of lead oxide. This compound is used to achieve certain brightness and sound. "That's why the glasses have a very high content." However, the Act limits the concentration of heavy metals (lead, cadmium, mercury and hexavalent chromium) in glass containers (bottles, jars and bottles) to 200 parts per million. So you can not enter into a melting furnace glass bottles containing traces of lead oxide. Otherwise, this compound will eventually in bottles or, worse, in the emissions leaving the stack. In fact, the researcher is not considered a serious issue that is recycled glass, then neither are many glasses or cups that are thrown (and today is using barium oxide instead of lead oxide). However, what we do is dangerous is that they may ovens other materials with even worse consequences. "The small size of the mouth of the green bins prevents people can do great nonsense," said Duran, who explains how it is others who may be committed by them.
Al Like the glass of a drink, there are other materials that are glass, but not be introduced into a furnace of packaging. The glass from car windows has a composition similar to that of a bottle. However, as the researcher explained today the car windshield is made up of several layers, like a sandwich: two glass plates and half a sheet of polyvinyl butyral (PVB), a polymer absorbing the stresses for greater resistance. The PVB can eliminate heat treatment, but this additional cost that exceeds the price itself or charred hull (which is called the fragments of glass containers recovered to be consolidated): between 50 and 60 euros a tonne. There are more cases in which the glass incorporated other elements that can cause problems in their management as waste. Most of the glazing have a coating to reflect ultraviolet rays and more effectively isolate or to give color. But for the researcher, which is of particular concern are the screens and tubes of old televisions and computer monitors. The arrival of DTT and flat screens suddenly turned into waste many TVs and monitors in recent years. These devices can and should be recycled, but the glass screens and tubes should not be used as cullet melting furnaces or flat glass containers because they contain high concentrations of lead oxide and phosphorus oxide. Sometimes these remains are used as fill for construction or road. And in the worst case, they may end mixed in the glass furnaces of the bottles, because once it is impossible to detect ground for managers of facilities who buy the raw materials recovered. "There is far less common, but cases have been detected," says the researcher. "We know because we have found contaminants such as lead in some chimneys."
Source: Blog on pais.conm Ecolab
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Source: Blog on pais.conm Ecolab
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