In North-East Bulgaria there have been found some silicite strata. The rocks contain SiO_2 (in the form of mineral chalcedony) up to 97 w. %. There have been carried many Laboratory and industrial experiments for obtaining watsrglass through the auto-clave method. There have been clarified the conditions for obtaining water glass of realy high quality. The experimental production of water glass from this new kind of raw material can be used in metallurgy, building, chemical industry, etc.
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