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Device and method for high-quality recovery of fluorine from wet-process phosphoric acid tail gas

A wet-process phosphoric acid, high-quality technology, applied in separation methods, chemical instruments and methods, fluorosilicic acid, etc., can solve problems such as aggravating pipeline blockage and reducing the effect of exhaust gas scrubbing, avoiding pipeline blockage, achieving significant economic benefits, and operating stable effect

Pending Publication Date: 2018-04-24
YICHANG EZHONG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, granular impurities circulate in the Venturi scrubber for a long time, aggravating the blockage of the pipeline and reducing the exhaust gas scrubbing effect

Method used

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  • Device and method for high-quality recovery of fluorine from wet-process phosphoric acid tail gas
  • Device and method for high-quality recovery of fluorine from wet-process phosphoric acid tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for high-quality recovery of fluorine in wet-process phosphoric acid tail gas, comprising the following:

[0034] 1) The circulation tank below the Venturi scrubber is filled with clean water from mechanical cooling until the overflow of the circulation tank just flows out, and it is used as fluorine-containing tail gas to spray washing water. The spray water was circulated for 37 hours, and the content of fluosilicic acid in the circulation tank liquid was measured to be 23wt%. It was pumped into the plate and frame filter press for filtration, and the filtrate was input into the liquid storage tank to obtain a filter press liquid without particles of 12.90±0.20m 3 , the filtrate is sold.

[0035] 2) The circulation tank of the second-stage washing tower continuously pumps the defluoridated water (fluorine content <2.0%w / w) into the purification tank, and the water in the circulation tank circulates in the body for spray washing.

[0036] 3) The outlet of the...

Embodiment 2

[0041] A method for high-quality recovery of fluorine in wet-process phosphoric acid tail gas, comprising the following:

[0042] 1) The circulation tank below the Venturi scrubber is filled with clean water from mechanical cooling until the overflow of the circulation tank just flows out, and it is used as fluorine-containing tail gas to spray washing water. The spray water was circulated internally for 19 hours, and the liquid fluosilicic acid content in the circulation tank was measured to be 12wt%. It was pumped into a plate-and-frame filter press for filtration, and the filtrate was input into the circulation tank at the lower part of the Venturi scrubber for internal circulation as spray water, and added Stop replenishing water when the clear water reaches the overflow port of the circulation tank and just discharge the liquid; the content of fluosilicic acid in the circulation tank is measured as 21wt% after 17 hours of internal circulation, pumped into the plate and frame...

Embodiment 3

[0049] A method for high-quality recovery of fluorine in wet-process phosphoric acid tail gas, comprising the following:

[0050] 1) The circulation tank below the Venturi scrubber is filled with clean water from mechanical cooling until the overflow of the circulation tank just flows out, and it is used as fluorine-containing tail gas to spray washing water. The spray water was circulated for 32 hours, and the content of fluosilicic acid in the circulation tank liquid was measured to be 19wt%, pumped into the plate and frame filter press for filtration, and the filtrate was input into the liquid storage tank to obtain a filter press liquid without particles 13.20±0.20m 3 , the filtrate is sold.

[0051] 2) The circulation tank of the second-stage washing tower continuously pumps the defluoridated water (fluorine content <2.0%w / w) into the purification tank, and the water in the circulation tank circulates in the body for spray washing.

[0052] 3) The outlet of the circulati...

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Abstract

The invention discloses a device and a method for high-quality recovery of fluorine from wet-process phosphoric acid tail gas. The device comprises a venturi scrubber, wherein a circulating tank is arranged at the bottom of the venturi scrubber, the circulating tank and the venturi scrubber are connected to constitute a scouring water internal circulating pipeline, a discharge port of the circulating tank is connected with a filter device, and a filtrate outlet of the filter device is connected to a fluorosilicic acid storage tank and the circulating tank; a tail gas outlet of the circulatingtank is connected with multi-stage scrubbing towers, and a tail gas outlet of the last-stage scrubbing tower is connected to a chimney. The tail gas scrubbing process further comprises multi-stage countercurrent scrubbing besides scrubbing by the venturi scrubber; furthermore, clear water or recycled water subjected to defluorination treatment is adopted in the countercurrent scrubbing process, fluorine content of water is low, so that fluorine in the tail gas is sufficiently scrubbed, and the requirement of up-to-standard discharge of the tail gas is met; according to the method, the high-quality fluorosilicic acid solution is recovered, fluorine resources are sufficiently utilized, environmental pollution caused by fluorine emission is avoided, economic benefit and social benefit are remarkable, and the method can be popularized and applied.

Description

technical field [0001] The invention relates to the technical field of wet-process phosphoric acid tail gas treatment, in particular to a device and method for high-quality recovery of fluorine in wet-process phosphoric acid tail gas. Background technique [0002] Wet-process phosphoric acid plays a dominant role in the production process of phosphoric acid. In the process of wet-process phosphoric acid production, the dihydrate method of producing phosphoric acid by sulfuric acid method has simple process, mature technology, stable operation and strong ore adaptability (my country's low-grade phosphorus Large ore reserves, less rich ore) and other advantages have prompted more than 80% of phosphoric acid in my country to be produced by the dihydric process. Because phosphate rock contains about 3% (w / w) fluorine element, in the production process of dihydrate phosphoric acid, the tail gas escaped from the extraction reaction tank contains a certain amount of fluorine (genera...

Claims

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Application Information

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IPC IPC(8): C01B33/10B01D53/14
CPCB01D53/1418B01D53/1456C01B33/103
Inventor 曾令国陈国华
Owner YICHANG EZHONG CHEM
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