What are the reasons why the liquid in the flue gas acid production purification cycle is red? What are the solutions?

The main reasons for the reddening of the liquid in the flue gas acid production purification cycle are as follows: first, the concentration of iron ions increases； Second, there may be contamination or impurities mixed in. Solutions can include: 1. Checking and cleaning the sources of contamination in the system to prevent the intrusion of external impurities. 2. Control the quality of the feed to prevent materials with high iron content from entering the system. 3. Improve the filtration or purification of the circulating liquid, using appropriate filter media or additives to remove iron ions. .

After testing the liquid, it was confirmed that the iron content is very high:handshake:handshake:handshake

During the process of producing acid from flue gas, the red color of the purification circulation liquid can be caused by various factors. The following is an analysis of these factors along with corresponding solutions: Factor analysis – High impurity content: The purification circulation liquid may contain high levels of impurities, especially iron ions. When the iron ion content is high, the circulating liquid may appear red. Corrosion of acid storage tanks: Rust may form inside acid storage tanks due to corrosion, and when this rust dissolves in the circulating liquid, it causes the liquid to turn red. Poor dust removal and purification effect: During the process of removing dust from flue gas, if the dust removal efficiency is low, dust and impurities in the flue gas may end up in the circulating liquid, causing the color of the liquid to turn red. The material contains high levels of selenium: In some cases, the material may contain high amounts of selenium. In the presence of sulfur dioxide, selenium may be reduced to elemental selenium, which enters the circulating liquid along with the flue gas, causing the liquid to turn red. High nitrogen oxide content: When the nitrogen oxide content in the flue gas is high, these nitrogen oxides can act as a catalyst for the reaction between iron and sulfuric acid, resulting in the formation of a complex salt of sulfuric acid and ferrous nitrate; this complex salt appears red. Solutions: Improve purification efficiency: Enhance the dust removal and purification process to ensure that dust and impurities in the flue gas are effectively removed, preventing such impurities from entering the circulating liquid. Strengthen the maintenance of acid storage tanks: Regularly inspect the interior of these tanks, and promptly remove rust and other impurities to prevent them from dissolving in the circulating liquid. Control material quality: During the procurement and storage of materials, strict control is exercised over their quality to prevent materials with high selenium levels from entering the production process. Optimize flue gas treatment processes: For flue gas containing high levels of nitrogen oxides, appropriate denitration measures can be taken to reduce the concentration of these compounds, thereby preventing them from acting as catalysts in the reaction between iron and sulfuric acid.

Since it has been confirmed that high iron content in the circulating liquid is one of the reasons for the red color, you can take the following measures to address this issue: 1. **Increase filtration or precipitation steps**: Implement additional filtration or precipitation processes to remove iron ions from the liquid. Special iron ion exchange resins or other adsorbent materials can be used. 2. **Adjusting pH value**: Adjust the pH value of the circulating liquid appropriately; in some cases, changing the pH value can promote the precipitation of iron ions, thereby facilitating their removal. 3. **Add a chelating agent**: Use an appropriate chemical chelating agent to stabilize iron ions in the solution, preventing their oxidation and resulting color changes. 4. **Regular cleaning and maintenance of the system**: Regularly clean the liquid circulation system to remove iron deposits that accumulate within it, ensuring the system remains clean and operates efficiently. 5. **Optimize raw materials and processes**: Examine and optimize the use of raw materials and the production processes to minimize the entry of iron ions. By implementing the above measures, the iron content in the circulating liquid can be effectively reduced, thereby solving the problem of the liquid turning red in the flue gas acid production purification system. .