The territories located near large industrial enterprises on aluminum and silicon production, experience powerful technogenic pollution. In the Irkutsk region quantity saved up fluorine - carbon – and siliceous waste reaches 13 million tons that renders serious ecological threat of the Baikal region. At the same time dust of cyclones and slime of silicon production contain substances which can find application in the industry. The method of electronic microscopy established availability of carbon nanotubes in a foamy product, received as a result of flotation of a cyclone dust from silicon production. From a comparison of methods known in the literature for producing carbon nanostructures found that carbon in the process of obtaining a crystalline silicon ore-smelting in the electric arc furnace is in the environment in which two mechanisms of formation of CNTs: catalytic decomposition of gaseous hydrocarbons and modified arc method. By electron microscopy revealed the presence of CNTs in the foam product obtained as a result of the flotation cyclone dust of silicon production. It is possible to receive carbon nanotubes from waste of silicon production.