1、 Overview

The pickling process is widely used in many industrial sectors in our country. In the metal pickling process, as the pickling operation continues, the concentration of the pickling solution continues to decrease, while the content of metal ions in the pickling solution continues to increase. When the concentration of the pickling solution drops below the specified value or the content of metal ions in the pickling solution exceeds the allowable limit, the pickling solution loses its pickling function and becomes waste acid. This waste acid cannot be used and is not allowed to be directly discharged according to national environmental regulations, which is a difficult problem to deal with.

The evaporation method waste acid regeneration device can extract ferrous chloride crystals from waste hydrochloric acid, which is a valuable chemical raw material that can be sold in the market. At the same time, it can obtain pure hydrochloric acid with the same concentration as the original waste acid and without iron salts. After adjusting the concentration with acid, it can be reused in acid washing. There is no wastewater discharge or any secondary pollutants generated during the regeneration process, which not only solves environmental problems but also has considerable economic benefits.

In summary, this waste acid regeneration device has the following characteristics:

1. Pure regenerated hydrochloric acid without iron salts can be obtained with the same concentration as the original waste hydrochloric acid. After adjusting the concentration through acid mixing, it can be reused in acid washing.

2. All ferrous chloride crystals contained in waste hydrochloric acid can be extracted, which is a valuable chemical raw material that can be sold in the market.

3. Throughout the entire evaporation process, it always operates in a state without the precipitation of ferrous chloride crystal particles, thus avoiding the danger of clogging pumps, pipelines, valves, etc.

4. During the regeneration process of waste hydrochloric acid, no secondary pollutants are generated, achieving zero emissions of pollutants.

5. The waste acid regeneration equipment not only solves environmental problems, but also has considerable economic benefits.

2、 Principle

The principle of the evaporation method for regenerating waste acid is based on the fact that ferrous chloride in the waste acid solution is a solid substance that is extremely difficult to evaporate. During the evaporation process of the waste acid solution, these metal salts always remain in the acid solution, and there are almost no substances such as ferrous chloride in the secondary steam. Therefore, the secondary steam condensate obtained by evaporation, namely the regenerated hydrochloric acid, does not contain any metal salt substances and produces pure hydrochloric acid that can be reused in acid washing.