TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The heavy plastics are washed with an aqueous solution containing compounds capable of dissolving lead (II) compounds and substances capable of reducing lead (IV) to lead (II) at ambient temperature and boiling point. A spent washing solution is regenerated by treat1ng it with alkali metal or alkaline earth sulfides or by treating it with metals which are less noble than lead making use of the cementation reaction which replaces the lead in solution with cations of these metals. The granular plastics are separated from the thin plastics by drawing up in a flow of air by using shape effect. The polyethylene is separated from the PVC and fabrics by using lesser brittleness of polyethylene in comparison with the other materials in a machine comprising a perforated cylinder in which numerous rubber or other suitable material rotate scraping the inner surface of the cylinder. The polyethylene with quality silica filler is pyrolyzed for 10 - 60 (preferably 20 - 45) minutes at 300 - 600 (preferably 470 - 530)degreesC. The pyrolysis gases and vapors are passed to a catalytic cracking reactor. The pyrolysis residue is oxidized under controlled temperature conditions i.e. at 400 - 600 (preferably 450 - 500)degreesC, in the presence of gaseous mixture comprising an inert gas and oxygen (3 - 7%).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The heavy plastics are washed with an aqueous solution containing compounds capable of dissolving lead (II) compounds and substances capable of reducing lead (IV) to lead (II) at ambient temperature and boiling point. A spent washing solution is regenerated by treat1ng it with alkali metal or alkaline earth sulfides or by treating it with metals which are less noble than lead making use of the cementation reaction which replaces the lead in solution with cations of these metals. The granular plastics are separated from the thin plastics by drawing up in a flow of air by using shape effect. The polyethylene is separated from the PVC and fabrics by using lesser brittleness of polyethylene in comparison with the other materials in a machine comprising a perforated cylinder in which numerous rubber or other suitable material rotate scraping the inner surface of the cylinder. The polyethylene with quality silica filler is pyrolyzed for 10 - 60 (preferably 20 - 45) minutes at 300 - 600 (preferably 470 - 530)degreesC. The pyrolysis gases and vapors are passed to a catalytic cracking reactor. The pyrolysis residue is oxidized under controlled temperature conditions i.e. at 400 - 600 (preferably 450 - 500)degreesC, in the presence of gaseous mixture comprising an inert gas and oxygen (3 - 7%). EXAMPLE - A mixture of heavy plastics materials (100 kg) obtained form the process of breaking up spent lead-aid batteries was treated at 60degreesC with sodium acetate solution (300 g/l) at pH 5.5 through the addition of acetic acid. Hydrogen peroxide (35%) was added to the solution to reduce the lead (IV) oxide. The mass was stirred for 30 minutes; after treatment the plastics materials were separated out by filtration and the solution was regenerated by treatment with metallic zinc in granules in order to selectively cement the lead (II) ions onto the zinc and replace them by zinc ions in solution. The plastics were rinsed with water, dried in a flow of hot air and subjected to a separation process based on the shape effect. The light plastics (flakes of polyethylene with silica filler, flakes of PVC and fabrics) drawn up by the flow of air were fed to apparatus comprising a perforated cylinder and a rotating shaft bearing many arms of rubber or other suitable material which scraped the inner surface of the cylinder. At the end of the separation treatment diaphragms (50 kg) comprising polyethylene with silica filler were recovered with a separation yield of approximately 80%. The PVC content of this fraction was less than 0.1%. The diaphragms comprising polyethylene with silica filler were pyrolyzed at 500degreesC. The pyrolysis gases and vapors were passed through a catalytic cracking reactor filled with an acid zeolite at 650degreesC and then passed to combustion chamber. A flow of nitrogen containing 5% oxygen was introduced to oxidize the carbonaceous residue deposited on silica and white colored silica having a surface area 148 m2/g was recovered.