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Washing method and apparatus for phosphoric acid reacting trough extracting tail gas

A technology of phosphoric acid reaction tank and washing method, which is applied in separation methods, chemical instruments and methods, and phosphorus compounds, and can solve problems such as high operation and maintenance costs, failure to meet environmental protection requirements, and low fluorine washing efficiency, and achieve operation and maintenance The effect of low cost, less process equipment and compact device arrangement

Inactive Publication Date: 2004-02-04
EAST CHINA ENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current tail gas scrubbing technology often has complex equipment, high operation and maintenance costs, large process water consumption, low fluorine scrubbing efficiency, and sewage discharge, which does not meet environmental protection requirements.

Method used

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  • Washing method and apparatus for phosphoric acid reacting trough extracting tail gas
  • Washing method and apparatus for phosphoric acid reacting trough extracting tail gas

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Adopt the 60,000 tons / year P of the present invention 2 o 5 Phosphoric acid extraction unit

[0021] See attached picture. The extracted exhaust gas is washed through the combined process of Venturi scrubber 1, primary exhaust gas scrubber 2, exhaust fan 4, and secondary exhaust gas scrubber 3. A primary exhaust gas scrubbing circulation pump 5 is installed outside the primary exhaust gas scrubber. A secondary tail gas scrubbing circulation pump 6 is installed outside the scrubber, and an overflow pipe 9 on the secondary exhaust scrubber 3 leads to the primary exhaust scrubber 2, and a circulating water inlet pipe is connected to the secondary exhaust scrubber 3. An exhaust fan 4 is installed between the exhaust scrubber 2 and the secondary exhaust scrubber 3, and the primary exhaust scrubber 2 is connected with a recovery water pump 7, which is used to pump the washing liquid to the filtration system, the Venturi scrubber 1 and the primary exhaust The washing tower ...

example 2

[0024] Adopt 120,000 tons / year P of the present invention 2 o 5 Phosphoric acid extraction unit

[0025] See attached picture. The extraction tail gas is washed through the combined process of Venturi scrubber 1, primary tail gas scrubber 2, tail gas fan 4, and secondary tail gas scrubber 3. Venturi scrubber liquid / gas ratio is 1 / 1000m 3 Liquid / m 3 For gas, the throat airflow velocity is controlled at 51m / s, and the spray density of the scrubber is 15m 3 / (m 2 h), the superficial gas velocity is 3.8m / s, and the absorption height is 7.8m. The rest are the same as Example 1.

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Abstract

A method for washing the extractable tail gas of phosphoric acid reactor features that a venturi washer and two shower-cyclone washing towers are searially arranged and under the action of external circulating pumps, said tail gas is serially washed. Its advantages are no discharge of sewage, and high effect to remove F from tail gas (9 mg / cu.m).

Description

technical field [0001] The invention relates to a gas washing technology, in particular to a method and equipment for washing the tail gas extracted from a phosphoric acid reaction tank with water. Background technique [0002] Wet-process phosphoric acid production is accomplished by decomposing phosphate rock with inorganic acids (mainly sulfuric acid). During the extraction reaction, the fluorine escaped in gaseous state accounts for about 5-10%wt of the fluorine content of the phosphate rock, and the rest remains in the phosphogypsum and dilute phosphoric acid. [0003] The fluorine discharged from the extraction reaction is mainly in the form of silicon tetrafluoride SiF 4 Morphology exists. The amount of gas discharged is related to the way of removing the heat of reaction. If air cooling is used, the amount of gas discharged will be large, and if vacuum cooling is used, the amount of gas discharged will be small. The large or small amount of discharged gas is only ...

Claims

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Application Information

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IPC IPC(8): B01D47/12C01B25/222C01B25/46
Inventor 吴大农胡文生洪金武喻军徐新源张林
Owner EAST CHINA ENG SCI & TECH
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