Method for recycling and purifying acid mist

A technology of acid mist and purification tower, which is applied in the direction of chemical instruments and methods, separation methods, and separation of dispersed particles, which can solve the problems of excessive HCI content in mist, increase the cost of wastewater treatment, waste pickling solution, etc., and reduce the dosage , the effect is good, the effect of reducing the consumption of hydrochloric acid

Inactive Publication Date: 2013-03-27
TIANJIN YIBO STEEL MAKING
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the original recovery process are: the amount of NaOH that needs to be added to the spray water for washing and absorbing acid mist is too large; Secondary NaOH neutralization treatment, the original method not only wastes the pickling solution but also increases the cost of wastewater treatment; the HCI content of the mist discharged through the purification tower exceeds the standard
Its disadvantages are: high acid consumption in the acid mist purification process, high operating costs, and the emission is not up to standard

Method used

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  • Method for recycling and purifying acid mist
  • Method for recycling and purifying acid mist

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Original recycling process:

[0019] The acid mist in the pickling device 1 is collected by the mist collector 2, the acid mist directly enters the purification tower 3, the acid mist passes through the purified waste gas, passes through the mist exhaust fan 4, and is discharged into the atmosphere through the chimney 5, and the waste water sprayed by the purification tower is discharged into the waste water treatment stand. Embodiment 1 has a simple process, poor purification effect, high consumption and substandard discharge.

Embodiment 2

[0021] The acid mist in the pickling device 1 is collected by the mist collector 2; the collected acid mist enters the condenser 3, and most of the acid mist is condensed into liquid acid; then enters the droplet separator 4 for vapor-liquid separation; the separated acid mist The liquid enters the acid storage tank 8 for storage in order to reconfigure the acid liquid; after the droplets are separated, the remaining small part of the acid mist enters the purification tower 5, and the acid mist passes through the tower and undergoes a neutralization reaction with the alkaline spray water of pH > 10 Thus, it is washed, absorbed and purified, and the spray wastewater in the purification tower flows into the wastewater treatment station; the remaining exhaust gas is discharged through the chimney 7 at high altitude.

Embodiment 3

[0023] A method for recovering and purifying acid mist: Under the action of the mist exhaust fan 4, the acid mist in the pickling device 1 is collected by the mist collector 2; the collected acid mist enters the condenser 5 at a temperature of 15°C, and most The acid mist condenses into liquid acid; then enters the droplet separator 6 for vapor-liquid separation, and controls the droplet diameter to be 0.05mm for separation, and the separated acid solution enters the acid storage tank 7 for storage in order to reconfigure the acid solution; After the separation, the remaining small part of the acid mist enters the purification tower 3, and the acid mist is washed in the purification tower through neutralization reaction with the NaOH spray water of PH>10, and meets the national discharge standard through two washings, absorption and purification; The remaining exhaust gas is discharged to the atmosphere through the chimney 9.

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Abstract

The invention discloses a method for recycling and purifying acid mist. According to the method, the acid mist in a pickler is collected by a mist collector under the action of a mist exhaust fan; the acid mist enters a condenser, and most acid mist is condensed into liquid acid; the liquid acid further enters a liquid drop separator so as to be subjected to gas-liquid separation; the separated acid liquid enters an acid storage tank to be stored up and laid up for being prepared into acid liquid; a small part of acid mist enters a purifying tower; the acid mist has neutral reaction in the purifying tower through alkali (NaoH) spray water (the pH value is 10 to 16) so as to be washed, absorbed and purified; and the residual waste gas is discharged to the atmosphere through a chimney. By recycling the acid mist HC1, the condensed acid liquid is recycled, the hydrochloric acid consumption is reduced by 12%, the burden of the purifying tower is alleviated, the feeding quantity of the NaOH is reduced by 80%, the acid mist is sufficiently purified, and the waste gas discharged to the atmosphere meets the exhaust standards of China.

Description

technical field [0001] The invention discloses an acid mist recovery and purification method, in particular to an industrial acid mist recovery and purification method, which is suitable for the industrial acid mist recovery and purification system of a pickling production line. Background technique [0002] Acid mist is mainly produced in the process of using acid in chemical industry, electronics, metallurgy, electroplating, textile (chemical fiber), machinery manufacturing and other industries, such as acid production, pickling, electroplating, electrolysis, acid battery charging, etc. In addition, in the process of some scientific research, different acids are also used. Because these acid-using processes often use a mixture of various acids, the exhaust gas emitted is also mostly a mixture of various acid mist. There are two main mechanisms for the formation of acid mist: one is that the surface of the acid solution evaporates, the acid molecules enter the air, and co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/68B01D5/00
Inventor 宋书成
Owner TIANJIN YIBO STEEL MAKING
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