process of recycling solid tannery waste by extracting chrome and recovering decontaminated leather.

摘要

"The process of recycling of solid resu00ecduos leather for extraction and recovery of chrome leather decontaminated.The present invention is characterized by the extraction of chromium (III) present in the sawdust and shavings, patchwork leather tanned with chromium, resulting from the process of lowering suffered by the leather.Another important aspect of this invention is to obtain, with extraction of chromium, a solid, rich in collagen and can be used in the food industry, coke or as fertilizer.This solid, now without chromium, also presented high removal of organic and inorganic substances from aqueous effluents and other means.The innovative aspect of this process of extraction of chromium from tannery solid waste consists in the fact that it was used as a complexing agent of low cost and mild conditions of extraction.Preventing the dissolution of the solid that can be recycled.In addition,The compound formed by chrome and the complexing agent (Cr (III) - complexing) was separated by the addition of sulphuric acid which allowed regeneration of complexing agent and chrome sulfate podAnd be used in the tanning process.