What is the material used for equipment that reacts sulfuric acid, *ao acid mixture with calcium hydroxide?

What about your concentration conditions? Otherwise, I’ll just go with titanium material – it’s definitely corrosion-resistant – but the price is... uh-uh

Does the poster meet the relevant requirements? A PTFE lining could be considered! When we have time, let’s discuss it together~!

Please describe it in detail. Otherwise, it’s impossible to select materials

What are the concentration, temperature, and pressure? Is a non-metallic lining used?

Hello, Louzhu. I have been working in the field of PTFE lining for 8 years. For media containing *ao acids and sulfuric acid, it is more appropriate to use PTFE lining for carbon steel. There is likely also a stirrer inside; temperature measurement tubes and steam pipes can also be lined with PTFE, but you need to meet the following conditions: 1) The reaction temperature should not exceed 150 degrees – if it does, it is highly recommended to use metal materials. 2) A slight negative pressure is acceptable; if the negative pressure is too high, metal materials are advised. 3) For heating, internal heating is used; for steam pipes and heat transfer oil, other materials should be used if a jacket is present. 4) If plastic is used for internal anti-corrosion, welding should not be carried out on the outside, as this can easily damage the lining layer. 5) This message was typed manually by the moderator – is it okay to include advertisements here? When needing design drawings for lining with PTFE in the 13485232222 forum, it’s best to consult professionals first to avoid unnecessary troubles

This post was last edited by Wang Genrong on 2015-9-18 07:22. Loose lining process vs. tight lining process – a comparison of advantages and disadvantages ● Disadvantages of the loose lining process: 1. It is a traditional Chinese technique from the 1980s. 2. The domestically produced sheets have poor quality. 3. Its separate structure allows it to resist only slight negative pressures. 4. Segmented flange connections are required, which creates potential issues with sealing surfaces. 5. The separate structure reduces the accuracy of electric spark testing. 6. Welds are damaged when exposed to extreme temperatures or alternating positive and negative pressures. 7. Air in the interlayer can cause damage during startup and shutdown. 8. The lining is constrained by the shape of the casing. 9. Flange connections for the casing increase costs. 10. Its service life is relatively short. ● Advantages of the tight lining process: 1. It represents the most advanced technology from the United States, Germany, Japan, and South Korea in the 21st century. 2. High-quality imported sheets ensure excellent corrosion resistance and durability. 3. The tight fit enables it to resist negative pressures up to -0.09 Mp. 4. No segmented connections are needed, so the overall structure of the equipment remains intact. 5. Electric spark testing provides accurate results without any missed defects. 6. It performs stably under extreme temperatures or alternating positive and negative pressures. 7. The vacuum environment in the interlayer prevents delamination or flattening. 8. The lining can be manufactured regardless of the shape of the equipment. 9. Its service life is typically 20–30 years. 10. No flange connections are required for the casing, resulting in lower costs. ● Advantage of the loose lining process: 1. Its total cost is relatively 10%–20% lower. ● Disadvantages of the tight lining process: 1. Its total cost is relatively higher