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 t...

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
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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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PUM

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Abstract

The invention discloses a device and method for high-quality recovery of fluorine in wet-process phosphoric acid tail gas; the device includes a Venturi scrubber, a circulation tank is arranged at the bottom, and the circulation tank and the Venturi scrubber are connected to form an internal circulation pipeline for washing water. The outlet of the circulation tank is connected with a filter device, and the filtrate outlet of the filter device is connected to the fluosilicic acid liquid storage tank and the circulation tank; the exhaust gas outlet of the circulation tank is connected to a multi-stage scrubber, and the exhaust gas outlet of the last-stage scrubber is connected to the chimney . In addition to the Venturi scrubber, the tail gas scrubbing process of the present invention also includes multi-stage countercurrent scrubbing. In addition, in the process of countercurrent washing, clean water or circulating water treated with fluorine removal is used, and the fluorine content in the water body is low, which is conducive to the full washing of fluorine in the tail gas to meet the requirements of tail gas emission standards; this method not only recovers high-quality Fluorosilicic acid solution makes full use of fluorine resources, avoids fluorine discharge and pollutes the environment, has remarkable economic and social benefits, and can be popularized and used.

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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