Method and device for recycling anhydrous sodium sulfate from desulfurization lead plaster filter liquor

Abstract

The invention relates to a method of recycling anhydrous sulfate sodium from de-sulfurized lead paste filtration, belonging to a resource recovery and utilization process, which avoids the disadvantages that waste sulfate is used and low concentration sulfate sodium is emitted into the environment. The method of the invention comprises: desulfurized lead paste filtration collection, sodium carbonate neutralization, first time heavy metal removal, filtration PH value adjustment, second-time heavy metal removal, decolorizing step, and vaporization and crystallization step; the device comprises a transfer tank, a neutralization tank, a first-stage purifying tank, a PH adjusting tank, a second-stage purifying tank, a decolorization tank, a filtration collection tank and a vaporization crystallization system; the waste sulfate collection tank is connected with a waste sulfate pre-processing tank, the waste sulfate pre-processing tank is respectively connected with the neutralization tank and the PH adjusting tank. The invention can directly recycle anhydrous sulfate sodium, the waste sulfate is used to neutralize the carbonate sodium remained in the filtration; the heavy metal ions and other ions in the filtration are removed according to two steps, so that the grade of obtained anhydrous sulfate sodium is equal to or larger than industrial grade.

Description

technical field

[0001] The invention belongs to resource recovery and utilization technology, in particular to a method and device for recovering anhydrous sodium sulfate from desulfurized lead paste filtrate, which is used for the process of recovering regenerated lead from waste lead-acid batteries. Background technique

[0002] The technology and process of recycling metallic lead from scrapped lead-acid batteries has been gradually applied in countries all over the world since the 1980s. In 1988, Oper M, Fracchia P and others proposed a patent on the recovery of metallic lead in waste lead-acid batteries using the "wet desulfurization-electrolytic deposition" process, see Oper M, Fracchia P. Hydrometallurgical process for an overall recovery of components of exhausted lead-acid batteries[P], US 476916, 1988-9-6; this patent is based on the chemical reaction of waste lead-acid batteries in the lead carbonate conversion of lead sulfate by sodium carbonate: lead sulfate = 1...

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