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

A technology of anhydrous sodium sulfate and desulfurization lead paste, which is applied in the field of resource recovery and utilization technology, and can solve the problems of different recovery methods of anhydrous sodium sulfate and different sources of waste liquid, etc.

Active Publication Date: 2010-06-30
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

But the above-mentioned process technology of reclaiming anhydrous sodium sulfate is only suitable for specific waste water, namely the source of waste liquid containing sodium sulfate is different, and the processing method of reclaiming anhydrous sodium sulfate from waste liquid is also different

Method used

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

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Embodiment Construction

[0024] Such as figure 1 As shown, the device of the present invention includes a transfer tank, a flushing water collection tank, a waste sulfuric acid collection tank, a waste sulfuric acid pretreatment tank, a neutralization tank, a first-level purification tank, a pH adjustment tank, a second-level purification tank, a decolorization tank, Filtrate collection tank and evaporation crystallization system.

[0025] When the specific gravity of the filtrate collected in the intermediate tank is less than 1.200, the filtrate will be sent back to the slurry tank for recycling; when the specific gravity of the filtrate is ≥ 1.200, the filtrate will be sent to the neutralization tank; After the battery electrolyte is sulfuric acid, it is sent to the waste sulfuric acid pretreatment tank for pretreatment. The pretreatment is to remove oil and suspended matter by air flotation, and remove insoluble substances through a microporous filter; the pretreated waste sulfuric acid is put int...

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Abstract

The invention relates to a method of recycling anhydrous sulfate sodium from de-sulfurized lead paste filtration, belonging to the technical field of 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 the following steps: 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 respectivelyconnected with the neutralization tank and the PH adjusting tank. The recycling method has the advantages that anhydrous sulfate sodium can be directly recycled, 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/02C01D5/16
Inventor 胡辉王珊珊王文超杨旗周荣
Owner HUAZHONG UNIV OF SCI & TECH
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