Method for recycling hydrochloric acid pickling waste gas

A technology of exhaust gas circulation and pickling, which is applied in the field of recovery of dilute hydrochloric acid, to achieve the effect of avoiding the consumption of pharmaceutical costs, avoiding waste, and strengthening the significance of environmental protection

Active Publication Date: 2009-11-04
WUXI XINGYI INTELLIGENT ENVIRONMENT EQUIP CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a method that can absorb the HCL in the hydrochloric acid pickling waste gas liquid into dilute hydrochloric acid and recycle it, and can reuse the purified clean air to the pickling car Recycling of was...

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  • Method for recycling hydrochloric acid pickling waste gas

Examples

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Embodiment 1

[0023] The pickling exhaust gas produced by the hydrochloric acid pickling line enters the first-stage spray absorption tower 2 under the action of the fan 1 . In the first-stage spray absorption tower 2, use the circulating spray pump 3 to lift the dilute hydrochloric acid absorption liquid in the recovery tank 4 of the first-stage spray absorption tower to the top of the first-stage spray absorption tower 2, and it can be easily dissolved by HCL Due to the characteristics of water, the hydrochloric acid waste gas is sprayed and absorbed, and the obtained absorption liquid is returned to the recovery tank 4 of the first-stage spray absorption tower.

[0024] The treatment efficiency of the hydrochloric acid pickling waste gas of the first-stage spray absorption tower 2 is about 80%, and 20% of the hydrochloric acid waste gas has not been completely treated, so the exhaust gas at the outlet of the first-stage spray absorption tower 2 enters the second-stage spray absorption tow...

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Abstract

The invention relates to the technical field of treating hydrochloric acid pickling waste liquid-gas, in particular to a method for recycling dilute hydrochloric acid from the hydrochloric acid pickling waste liquid-gas. The method generally comprises a process of progressively downstream hydrochloric acid pickling waste gas produced by pickling lines, a process of allowing absorption liquid to progressively flow back and a process of blending and recycling. The method has the advantages that the method can recycle HCL available resources in the pickling waste gas, recover and prepare the HCL available resources into the dilute hydrochloric acid and return the dilute hydrochloric acid to production lines so as to avoid the waste of resources, and compared with a lye-spraying method, the method avoids consuming a large amount of medicament cost and has obvious economic benefit. As treated clean air is returned to the production lines as blasts so as to realize the zero-emission closed cycle of the whole waste gas treatment, waste-gas emission chimneys no longer need to be arranged outside the production lines, thus the method has strong significance for environmental protection.

Description

technical field [0001] The invention relates to the technical field of hydrochloric acid pickling waste liquid waste gas treatment, in particular to a method for recovering dilute hydrochloric acid from hydrochloric acid pickling waste liquid waste gas. Background technique [0002] Pickling is an important process in metal surface treatment. Due to the strong corrosiveness of hydrochloric acid, almost all metals can react with it under high temperature conditions. Therefore, most of the pickling industry in my country uses hydrochloric acid as the pickling medium to remove the oxide layer on the metal surface. And because hydrochloric acid has strong volatility, pickling often needs to be carried out at a higher temperature, so the volatilization of hydrochloric acid is accelerated. The volatile acid liquid enters the air, meets the moisture in the air and condenses, forming fine mist droplets. In addition, due to the chemical reaction in the pickling solution, a large n...

Claims

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Application Information

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IPC IPC(8): B01D53/18C23G3/00B08B15/04
Inventor 匡优新
Owner WUXI XINGYI INTELLIGENT ENVIRONMENT EQUIP CO LTD
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