1. At present, the most commonly used concentrated acid-resistant material in our Chinese market is organic PTFE material. Although PTFE materials are not the best in terms of resistance to concentrated acid, they are still successful. However, if this material is used in chemical companies, smelting companies, and phosphate fertilizer companies that produce sulfuric acid, the acid-resistant effect will be greatly reduced. There are several disadvantages to using PTFE materials in sulfuric acid plant equipment.
1. Impracticability: Most of the PTFE materials currently used in the Chinese market are solid, and they can be used locally for anti-corrosion in sulfuric acid equipment. However, if we want to fundamentally solve the leakage problem of sulfuric acid equipment, we must carry out anti-corrosion treatment on the entire equipment, using a relatively large amount of anti-corrosion materials. However, solid PTFE materials cannot be used in large quantities on tower tanks in sulfuric acid equipment, and organic PTFE materials are relatively expensive.
2. Not resistant to high temperatures: Although PTFE materials can withstand concentrated acid, they cannot withstand high temperatures like traditional acid-resistant materials. When the sulfuric acid tower is running, the inner wall can reach several hundred degrees, which is far beyond the temperature that the PTFE material can withstand. No matter how good the acid resistance is, it will be destroyed by high temperature
3. Not wear-resistant: When used in sulfuric acid pipelines, sulfuric acid towers, circulation tanks and other places, it must have good cavitation resistance, which is also interpreted as wear-resistant. This is not possible with current organic PTFE materials.
The polymer material (3216 semi-solid composite repair material) jointly developed by Zhongshun Petrochemical Company and the Institute of Physics of the Chinese Academy of Sciences is aimed at the serious leakage of equipment in the dry suction section of the sulfuric acid body equipment, which affects the system. Developed for normal operation problems. The main components of the material are imported from the American IST Company and synthesized three times through high temperature and high pressure in the system. The material has been used on-site by many well-known domestic sulfuric acid companies for 6 years, and has been confirmed to fully meet the process and technical requirements of sulfuric acid equipment. Compared with the concentrated acid-resistant PTFE materials currently used in the market, it has the following advantages:
1. Practicality: The main acid-resistant component XXX material is synthesized three times through high temperature and high pressure, and becomes a liquid that can withstand any concentration of sulfuric acid. It can be well used in towers, tanks and other places in sulfuric acid equipment systems.
2. Good high temperature cavitation resistance: It is time to change the traditional single PTFE material and not use it alone after turning it into a liquid. In addition, the non-ferrous smelting refractory and wear-resistant material Zhongshun ZSSH-7 jointly developed by our company and Luoyang Sinosteel Group Refractory Materials Research Institute is also provided. Mix the acid-resistant stock solution ZSSH-7 with water glass and strengthening agent in a certain proportion to prepare it. The prepared material is our company's patented product; 3216 semi-solid composite repair material. Patent number (2007100176935)
3. Fast curing in acidic environment: The material can be constructed with or without driving. If the equipment leaks, there will be a large amount of accumulated acid in the interlayer, so the material can be quickly and completely cured in an acidic environment.
2. The patented product ZSSH-7 of the furnace body repair project patent number (200910166208.