Thread Content
In desulfurization processes, corrosion-resistant and wear-resistant pumps are widely used. There are two types of such pumps: non-metallic pumps and metallic pumps. Among non-metallic pumps, there are engineering plastic pumps and ceramic pumps. In the wet flue gas desulfurization process, problems such as equipment scaling, blockage, corrosion, and wear are quite severe; in particular, corrosion and erosion of the desulfurization pumps are significant issues. Therefore, resistance to corrosion and wear is extremely important. Currently, various industries in China use four main technical solutions to address the problems of corrosion and wear in desulfurization pumps: 1. Using steel-lined materials with wear-resistant plastics – To improve the performance of certain components in desulfurization pumps, manufacturers employ lining techniques to reduce costs, using polymers such as polypropylene, polytetrafluoroethylene, and other wear-resistant engineering plastics. This pump extends the service life to a certain extent, but it also has potential drawbacks, such as the issue of repairing worn linings and limitations on the conditions under which repairs can be carried out. 2. Improved metal materials: Traditional solutions involve raising the grade of the material in order to address design flaws and corrosion caused by various media. For example, the material used in desulfurization pumps of type A49 is actually a white cast iron with high chromium content; it is similar to Cr30 material, with a chromium content of around 28.5%. This is a material developed by pump manufacturers based on their experience and the conditions encountered in different environments. The increase in material costs ultimately leads to an intensification of the imbalance between supply and demand, a continuous decline in competitiveness and risk resistance, and the waste of numerous limited resources. 3. Application Technology of Polymer Materials: The use of polymer repair materials offers advantages such as excellent adhesion properties, corrosion resistance, wear resistance, erosion resistance, cavitation resistance, and a low-friction surface (as friction is significantly reduced in high-speed turbulent flow). These properties not only address the common problems associated with pumps but also play a crucial role in extending the pump’s service life, ensuring long-term stability in its performance, and improving its efficiency. It not only enables effective control of manufacturing costs, but also features excellent performance and a long service life; furthermore, it helps users extend the procurement cycle and reduce production costs. 4. Modification of conventional oxide ceramic pumps – Ceramic anti-corrosion and wear-resistant pumps, developed by improving upon existing ceramic pumps, are improved versions of pumps specifically designed for wet smelting processes. Its structural feature is that in the areas of the pump cover at the front and back, where wear is most severe, ceramic materials of excellent wear resistance (UT type) or wear-resistant metals (UB type) are embedded within a polymer plastic matrix. This pump boasts significant advantages such as good temperature and wear resistance, reliable sealing, easy installation and disassembly, and low maintenance and operating costs. Pumps commonly used for transporting corrosive slurries in hydrometallurgical processes are generally engineering plastic pumps, ceramic pumps, and stainless steel alloy pumps. However, in practical use, there are various drawbacks such as the poor high-temperature wear resistance of polyethylene pumps with ultra-high molecular weight, the tendency of ceramic-lined pumps to crack and get damaged, and the high cost of pumps made from highly wear-resistant metal alloys. There has been no significant improvement in this situation over the years. With years of experience in pump manufacturing, and through long-term observation and analysis of the wet smelting process, our company has drawn on its extensive experience in producing wear-resistant pumps to address the issues that arise during their use. By optimizing the functions of these pumps and combining the advantages of various materials, we have designed and manufactured the UT (UB) series of economical, durable, corrosion- and wear-resistant pumps. These pumps effectively compensate for the shortcomings of the pumps previously in use, solving the problems of short service life and high operating costs associated with slurry transfer pumps in the high-temperature leaching stages of wet smelting.