Efficient device for recovering oxalic acid from titanium oxalate waste liquid and recovery method thereof

Abstract

The invention discloses an efficient device for recycling oxalic acid from titanium oxalate waste liquid and a recycling method thereof. The efficient device comprises an oxalic acid waste liquid recycling mechanism, a first-stage filtering mechanism, a second-stage filtering mechanism and a nanofiltration mechanism which are sequentially connected through a pipeline, and a booster pump is arranged between the oxalic acid waste liquid recycling mechanism and the first-stage filtering mechanism; the first-stage filtering mechanism is connected with the second-stage filtering mechanism through a pipeline; an NF high-pressure pump is arranged between the second-stage filtering mechanism and the nanofiltration mechanism; and the first-stage filtering mechanism comprises a bag type filter, the bag type filter is connected with the booster pump through a pipeline, and the second-stage filtering mechanism comprises a security filter. Through cooperative use of a sedimentation tank, the booster pump, the bag filter, the security filter, the NF high-pressure pump and the NF device, wastewater generated after acid pickling can be effectively filtered, oxalic acid is recycled, the treatment amount of the wastewater is greatly reduced, and meanwhile, a large amount of economy is saved through recycling of the oxalic acid.

Description

technical field [0001] The invention relates to the technical field of recovery of oxalic acid waste liquid, in particular to a device for recovering oxalic acid from high-efficiency titanium oxalate waste liquid and a recovery method thereof. Background technique [0002] During the processing of titanium electrode plates, the surface needs to be pickled with oxalic acid to remove the oil stains and oxide layer on the surface. Pickling oxalic acid is recycled. When the acidity of free oxalic acid in the pickling solution drops to a certain level (actually, when the titanium ion content in the acid solution reaches a certain concentration), the pickling effect becomes poor and new acid needs to be replaced. [0003] The waste liquid produced after traditional pickling is directly discarded after preliminary precipitation, resulting in a large amount of waste liquid treatment and low economic efficiency. In titanium oxalate wastewater, the content of oxalic acid is about 6%, ...

AI Technical Summary

Problems solved by technology

[0003] The waste liquid produced after traditional pickling is directly discarded after preliminary precipitation, resulting in a large amount of waste liquid treatment and low economic efficiency. In titanium oxalate wastewater, the content of oxalic acid is about 6%, and direct disposal will cause a large amount of waste. Economic loss, therefore need a kind of device and recovery method thereof for reclaiming oxalic acid in high-efficiency titanium oxalate waste liquid

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