Washing and absorbing device and method for wet process phosphoric acid production tail gas

A tail gas scrubbing and wet-process phosphoric acid technology, which is applied in separation methods, chemical instruments and methods, fluosilicic acid, etc., can solve the problems of reduced reaction speed, easy plugging of packing systems, and high content

Active Publication Date: 2017-01-04
GUIZHOU KAILIN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (2) SiF in wet-process phosphoric acid extraction tail gas 4 High content, SiF 4 Form SiO at the gas-liquid interface with the moisture in the scrubbing absorbent 2 ·nH 2 The colloidal foam layer of O will reduce the SiF 4 The reaction speed with the moisture in the washing absorbent limits the continuous progress of the interface chemical reaction process
At the same time, SiO is precipitated in the liquid phase 2 ·nH 2 O colloid is easy to deposit on the inner wall of the absorption tower, the inner wall of the pipeline for absorbing the washing and circulating liquid and the nozzle, causing the blockage of the inner wall of the washing absorption tower and the pipeline, affecting normal production
[0009] (3) The raw material phosphate rock used in the production of wet-process phosphoric acid us...

Method used

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  • Washing and absorbing device and method for wet process phosphoric acid production tail gas
  • Washing and absorbing device and method for wet process phosphoric acid production tail gas
  • Washing and absorbing device and method for wet process phosphoric acid production tail gas

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Tail gas scrubbing and absorbing tower 7. The backwater volume of phosphorus supplemented gypsum slag field is 150-200m 3 / h, after washing and absorbing the tail gas, it is measured by a flow meter, divided into 10m 3 / h into the tail gas scrubbing and absorbing system in the order of "trifluorine scrubbing and absorbing tower 4→difluorine scrubbing and absorbing tower 3→monofluorine scrubbing and absorbing tower 1". The remaining water is pumped to the backwater large circulation pool of the phosphogypsum slag yard.

[0061] The high and low liquid level control butterfly valves of the inlet pipes of all tower pumps are in the open state. Adopt trifluorine scrubbing absorption tower spray washing circulation pump, difluorine scrubbing absorption tower spray scrubbing circulation pump and monofluorine scrubbing absorption tower spray scrubbing circulation pump respectively to trifluorine scrubbing absorption tower 4, difluorine scrubbing absorption tower 3 and a The ...

Embodiment 2

[0079] Tail gas scrubbing and absorbing tower 7, trifluorine scrubbing and absorbing tower 4, difluorine scrubbing and absorbing tower 3 and monofluorine scrubbing and absorbing tower 1 are intermittent independent spray washing. Use the overflow pipeline of the spray washing circulation pump of the corresponding trifluorine washing absorption tower, the overflow pipeline of the spray washing circulation pump of the difluorine washing absorption tower and the overflow pipeline of the spray washing circulation pump of the monofluorine washing absorption tower 4. The difluorine scrubbing and absorbing tower 3 and the monofluorine scrubbing and absorbing tower 1 carry out excess water replenishment.

[0080] (1) Open the backwater valve of the slag field and measure by the flow meter to replenish water in the tail gas scrubbing and absorbing tower 7. When the liquid level of the tail gas scrubbing and absorbing tower 7 exceeds 90%, open the tail gas scrubbing and absorbing tower 7...

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PUM

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Abstract

The invention discloses a washing and absorbing device and method for wet process phosphoric acid production tail gas. Five-stage countercurrent washing absorbing modes of a mono-fluoro washing and absorbing tower, a venturi washing absorber, a difluoro washing and absorbing tower, a trifluoro washing and absorbing tower and a tail gas washing and absorbing tower are adopted, after washing and absorbing are performed, high-altitude emission is performed at 80 m high part, when the concentration of a washing and absorbing solution (mainly H2SiF6) of the mono-fluoro washing and absorbing tower is larger than or equal to 10%, the solution is drained to a tail gas washing and absorbing system defluorinated silica acid storage tank to be sedimented, a supernate is adopted as a raw material of a Na2SiF6 workshop and an anhydrous HF workshop after dissolved iodine in the supernate is recycled, and lower sedimentation silica gel is adopted as a raw material of a white carbon black workshop. The device has the advantages that the obvious wet process phosphoric acid production tail gas washing and absorbing effects are obvious, the recycling rate of fluorosilicone iodine resources in tail gas is high, the device automatic degree is high, and the operation and maintenance cost is low.

Description

technical field [0001] The invention relates to a device and method for scrubbing and absorbing tail gas from wet-process phosphoric acid production, and belongs to the field of phosphorus chemical production. Background technique [0002] As an important new chemical material, fluorosilicon materials are widely used in military industry, aerospace, petrochemical, electronic information, automobile, textile, medicine, agriculture, environmental protection, food, new energy and strategic emerging industries. After more than 50 years of development, my country's fluorosilicon material industry has formed a high-tech industry with complete categories, a complete industrial chain, and is highly related to other industries. At the same time, my country has become a major producer and consumer of fluorosilicon materials in the world. [0003] In nature, fluorine resources mainly come from natural cryolite, fluorite and phosphate rock. Among them, the amount of natural cryolite is...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/18B01D53/68B01D53/78C01B7/14C01B7/19C01B33/10C01B33/12
CPCB01D53/1406B01D53/1425B01D53/1456B01D53/18B01D53/68B01D53/78C01B7/14C01B7/191C01B33/103C01B33/12
Inventor 项双龙彭宝林廖吉星周勇赵井腥安美华
Owner GUIZHOU KAILIN GRP CO LTD
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