METHOD OF EXTRACTING SILICA CONTAINED IN SEPARATORS BETWEEN LEAD-ACID BATTERY CELLS Russian patent published in 2009 - IPC H01M10/54 H01M10/06 

FIELD: chemistry; electrochemistry.

SUBSTANCE: present invention pertains to the chemical industry, and more specifically to extraction of silica contained in diaphragms, acting as separators between lead-acid battery cells, using different methods. According to the invention, the method of extracting the said silica contains the following stages: a) washing heavy plastics to remove lead compounds and other foreign bodies, b) separating the plastics from the washing solution, c) extracting lead and recycling the washing solution, d) rinsing the plastics, e) drying the plastics, f) separating granular plastics from thin plastics (polyethylene with silica filler, polyvinyl chloride, fabric) by stretching in an air stream using shape effect, g) separation of polyvinyl chloride and fabric from polyethylene with silica filler fragmentation, h) pyrolysis of polyethylene with silica filler, i) cracking pyrolysis gases and vapours, so as to reduce their molecular weight and make it easier to handle them and burning with the objective of obtaining heat, required for pyrolysis, j) oxidation of the pyrolysis residue to remove carbon residue and extract silica, k) pyrolysis of the mixture of polyvinyl chloride and fabric in the presence of alkaline substances, l) oxidation of residue from pyrolysis of polyvinyl chloride and fabric, obtaining inert ash.

EFFECT: extraction and recycling of materials.

7 cl, 3 dwg