Recovery of sulfides from tannery waste liquor

Chemistry of inorganic compounds – Sulfur or compound thereof – Ternary compound containing hydrogen and metal

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423563, 4235662, 422237, 8 9417, 210150, 210188, 210718, 210705, 210750, 210752, 210905, C01B 1732, C01B 1722, C14C 108, C02F 120

Patent

active

053286774

ABSTRACT:
An apparatus and process for the removal and recovery of sulfides from tannery waste water or liquor. The apparatus comprises a closed vessel, the sulfide-bearing liquor is introduced into a first or acidulation zone of the vessel and mixed with acid to decrease the pH, preferably to a value below 4.0, and generate hydrogen sulfide. The acidified liquor is then overflowed into a second or desorption zone of the vessel and slowly agitated and conveyed through the second zone by disc conveyors to release the hydrogen sulfide gas from the liquor. A slight vacuum is drawn on the vessel causing the released hydrogen sulfide gas to be drawn into a third reaction zone of the vessel, where the gas combines with sodium hydroxide solution to form sodium sulfhydrate. The effluent from the second zone can be filtered or dewatered and the filtrate discharged to a disposal site while the proteinaceous solids can be recovered for use as fertilizer. The sodium sulfhydrate produced in the third zone can be used in the unhairing operation of the tanning process.

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