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Acid-washing waste acid reproduction method

A technology of pickling waste acid and pickling steel, which is applied in the field of recovery of pickling waste acid, can solve problems such as environmental pollution and waste of resources, and achieve high-quality results

Inactive Publication Date: 2007-09-26
黄健
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes a further waste of resources and also pollutes the environment to a certain extent.

Method used

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  • Acid-washing waste acid reproduction method

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Embodiment Construction

[0010] A method for regenerating waste pickling acid, comprising the following steps: preheating waste hydrochloric acid solution at 75 to 85°C after pickling steel product surface rust, and distilling the hydrochloric acid out of it through evaporation and distillation, and heating the waste hydrochloric acid solution at 45°C Cooling and recovery; at the same time, incinerate the ferrous chloride hydrate formed after evaporation, the incineration temperature is 370-390 ℃, the hydrogen chloride gas produced by incineration is recovered as hydrochloric acid after cooling, and the iron oxide produced by incineration is collected.

[0011] The chemical principle of the present invention is: when hydrochloric acid washes and removes the rust on the surface of steel products, iron oxide and hydrochloric acid react to generate ferrous chloride and low-concentration hydrochloric acid, that is:

[0012] Fe 2 o 3 +HCl→FeCl 3 +H 2 o

[0013] FeCl 3 +Fe→FeCl 2

[0014] When incine...

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Abstract

The invention discloses a regenerating method of waste pickling acid, which comprises the following steps: evaporating alcaine from waste alcaine liquid of rust pickling steel product; cooling; recycling; sintering iron chloride; cooling the sintered hydrogen chloride gas to form alcaine; recycling; collecting the sintered ferric oxide; circulating alcaine effectively.

Description

Technical field: [0001] The invention relates to a recovery method of pickling waste acid. Background technique: [0002] Steel rolling industry, steel wire rope industry, electroplating industry, etc. usually use hydrochloric acid to remove rust on the surface of steel products to preserve steel products or further process them. After pickling, the concentration of hydrochloric acid is reduced to a certain level, and ferrous chloride is produced, so it no longer has the pickling ability and becomes waste acid. The traditional method is to neutralize the spent acid to neutral with alkali, then recover certain components and discharge them. This causes further waste of resources, and also has certain pollution to the environment. Invention content: [0003] The object of the present invention is to provide a method for regenerating spent pickling acid that can effectively recover hydrochloric acid in spent pickling acid. [0004] Technical solution of the present inventi...

Claims

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Application Information

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IPC IPC(8): C23G1/36
Inventor 黄健
Owner 黄健
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