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A phosphogypsum treatment device and method based on sodium sulfate electrolysis

A treatment device, sodium sulfate technology, applied in electrolysis components, electrolysis process, cells, etc., can solve the problems of high energy consumption, high operating voltage, reduced membrane performance, etc., and achieve the effects of low investment, compact device, and convenient movement.

Active Publication Date: 2021-04-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention solves the technical problems that the device for processing phosphogypsum in the prior art tends to reduce membrane performance, high operating voltage and high energy consumption

Method used

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  • A phosphogypsum treatment device and method based on sodium sulfate electrolysis
  • A phosphogypsum treatment device and method based on sodium sulfate electrolysis
  • A phosphogypsum treatment device and method based on sodium sulfate electrolysis

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Experimental program
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Embodiment 1

[0051] In this embodiment, the phosphogypsum treatment device based on sodium sulfate electrolysis is specifically: a sulfuric acid storage tank 1, an acid circulation pump 2, a sodium sulfate storage tank 3, an alkali circulation pump 4, a sodium sulfate electrolyzer 5, and an alkali tee The electrolysis unit consisting of valve 6, acid three-way valve 7, and DC power supply 8 and the reaction unit consisting of phosphogypsum reactor 9, slag discharge pump 10, filter 11, filtrate storage tank 12, and return pump 13 are two parts and several Valve / flowmeter composition. The sulfuric acid solution in the sulfuric acid storage tank 1 is pumped into the anolyte channel 19 of the electrolyzer through the pipeline by the acid circulation pump 2, and the sulfuric acid solution flows back to the sulfuric acid storage tank 1 through the pipeline after flowing through the anode chamber 15 of the electrolyzer. The sodium sulfate solution in the sodium sulfate storage tank 3 is pumped in...

Embodiment 2

[0055] figure 2 It is an exploded schematic diagram of a dual-channel sodium sulfate electrolyzer provided by a preferred embodiment of the present invention. The basic composition of sodium sulfate includes anode 14, anode chamber 15, anion exchange membrane 16, cathode chamber 17, cathode 18, anolyte channel 19 and catholyte channel 20. This structure is the basic structural unit of the multi-channel electrolyzer of the present invention, and multiple channels are stacked with this double-channel structure.

[0056] The concrete parts of described sodium sulfate electrolyzer are anode 14, anode chamber 15, anion exchange membrane 16, cathode chamber 17, cathode 18. The basic structure is a single membrane with two chambers, which are stacked as a basic unit to form a multi-channel electrolyzer, and the anode chamber 15 and the cathode chamber 17 are connected in parallel. The anode / cathode electrolyte flows into the individual anode / cathode chambers respectively through t...

Embodiment 3

[0060] Figure 5 It is a schematic diagram of a columnar flow field on the anode side provided by a preferred embodiment of the present invention. The anolyte flows into the anode chamber 15 through the anolyte channel 19 through the columnar flow field, and finally returns to the anolyte channel 19 through the columnar flow field, and the anolyte is more evenly distributed after passing through the columnar flow field. The catholyte channel 20 flows directly through this region, with no corresponding outlet.

[0061] Image 6 It is a schematic diagram of an anode serpentine flow field provided by a preferred embodiment of the present invention. The anolyte flows into the serpentine anode compartment 15 through the anolyte channel 19 and finally returns to the anolyte channel 19 . The catholyte channel 20 flows directly through this region, with no corresponding outlet.

[0062] Figure 7 It is a schematic diagram of a river-shaped flow field on the cathode side provided ...

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Abstract

The invention discloses a phosphogypsum treatment device and method based on sodium sulfate electrolysis, belonging to the technical field of electrochemical engineering technology application. Including electrolysis unit and reaction unit, sulfuric acid storage tank, acid circulation pump, acid three-way valve and sodium sulfate electrolyzer are connected sequentially, and sulfuric acid storage tank is directly connected with sodium sulfate electrolyzer; sodium sulfate storage tank, alkali circulation pump, alkali three The through valve is connected to the sodium sulfate electrolyzer in sequence, and the sodium sulfate storage tank is directly connected to the sodium sulfate electrolyzer; the alkali three-way valve is connected to the phosphogypsum reactor, and the phosphogypsum reactor, slag discharge pump, filter, filtrate storage tank and The return pump is connected in turn, and the return pump is connected with the sodium sulfate storage tank. In the treatment method of the present invention, sodium sulfate is electrolyzed to generate caustic soda and sulfuric acid, and caustic soda reacts with phosphogypsum to generate slaked lime. The sulfuric acid is returned to the production line of the phosphate fertilizer plant, and the sodium sulfate solution is recycled to recycle calcium and sulfur elements. The device is compact, the structure is simple, the operation is stable, the resource recovery rate is high, there is no secondary pollution, and zero pollution emission is realized.

Description

technical field [0001] The invention belongs to the technical field of electrochemical engineering technology application, and more specifically relates to a phosphogypsum treatment device and method based on sodium sulfate electrolysis. Background technique [0002] my country is a large agricultural country and consumes a large amount of phosphate fertilizer every year. Every ton of phosphate fertilizer produced will produce about 4.8 tons of phosphogypsum. The cumulative inventory of phosphogypsum has exceeded 500 million tons. The traditional pyroprocessing process equipment requires large investment, high coal consumption, high power consumption, coupled with poor product quality and unstable sulfuric acid production, the actual production capacity of most equipment is far below the designed production capacity and even faces shutdown. Phosphogypsum has become an important environmental protection issue restricting the sustainable development of the phosphorus chemical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/22C25B1/20C25B9/19C25B15/08C25B15/00C01F11/02C25B9/23
CPCC25B1/22C25B15/08C01F11/02C25B1/04C25B9/73C25B9/23Y02E60/36
Inventor 吴旭韦聚才古月圆付饶
Owner HUAZHONG UNIV OF SCI & TECH
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