What To Do If The Metal Impeller Of The Chemical Pump Wears Out

Jul 16, 2025

In the chemical industry, water pumps are commonly used equipment for transporting liquids. For metal water pumps, the internal structure and impeller are also made of metal raw materials. In the desulfurization system, the impeller of the metal raw material pump is a normal state of corrosion. When the impeller shows corrosion and wear, it greatly reduces the application function. Can the wear of the metal impeller of the chemical pump be corrected?
1, Analysis of Wear Causes of Pump Shell, Impeller, Guard Plate and Absorption Tower Agitator
The absorption tower slurry contains a large amount of oxygen ions, and the impeller of the slurry circulation pump The pump casing, protective plate, and absorption tower agitator are mostly made of alloy or rubber lining materials, which have a strong effect on the chemical corrosion of related components. In addition, physical wear and tear greatly reduces the service life of the components. The impeller, pump casing, guard plate, and absorption tower agitator modified by silicon carbide ceramic technology form a thick ceramic isolation layer on the surface, effectively suppressing chemical corrosion and physical wear. The impeller, pump casing, guard plate, and absorption tower agitator made of silicon carbide composite materials use silicon carbide particle technology. After the modification of this technology, the metal impeller is wrapped as a whole, and there is no metal or acid reaction to meet the skill requirements. Below are detailed explanations of three types of corrosion conditions.
1. Cavitation: Due to planning issues with the pump (such as selecting too small a pump, rotating the impeller too quickly, etc.), the pump lacks suction, forming bubbles at the inlet that impact the impeller.
2. Chemical corrosion: Mainly due to the acidic nature of the slurry, it undergoes a chemical reaction with the metal material on the impeller, resulting in chemical corrosion. Secondly, the potential difference on the surface of the impeller causes electron transfer and oxidation reactions, which directly damage the metal.
3. Physical wear: Due to the presence of a large amount of particulate matter such as limestone and gypsum in the slurry, it directly impacts and damages the pump impeller at the suction port.
2, Correction of impeller, pump casing, and agitator
The slurry circulation pump is an important component of the desulfurization system, and its operation directly affects the normal operation of the entire system. At the same time, the slurry circulation pump has the advantage of being a large energy consumer. A 500KW slurry circulation pump that operates continuously throughout the year consumes over four million kilowatt hours of electricity per year. During long-term operation, the impeller and pump casing are damaged by wear, corrosion, cavitation, and other factors, resulting in concave pits on the impeller and pump casing. In severe cases, there may even be gaps and wear through, causing structural damage to the impeller and pump casing. This can seriously reduce the efficiency of the equipment and render it useless.

Due to the harsh working conditions of the slurry circulation pump, the impeller usually needs to be replaced or modified after one to two years of operation. The impeller has special information and is costly, and the conventional replacement method is expensive and time-consuming. The use of silicon carbide composite materials and advanced skills and equipment continuously improves the pump casing and impeller correction process, providing a perfect solution for anti-corrosion, anti-wear and correction treatment of damaged impellers and pump casings. It can extend the service life of equipment, shorten repair cycles, save repair and operating costs, and has achieved good results in practice.
At high temperatures, Si and carbon in the form of SiO2 combine to form SiC, with a relative diamond hardness of 9.7 (diamond hardness of 10). Due to the varying sizes of crystal particles, relative motion is less likely to occur within the material. It has strong chemical corrosion resistance and is an excellent adhesive. Silicon carbide materials are mixed in a certain proportion in a vacuum state and processed through special processes to form a material with high wear resistance and corrosion resistance, namely silicon carbide polymer composite materials.
3, Silicon carbide polymer composite coating replaces traditional and commonly used surface protection techniques, applied to surfaces such as metal, plywood, fiberglass, wood, etc., to provide wear resistance and corrosion resistance to the substrate. Features that cannot be compared to other traditional skills:
1. Chemical corrosion resistance: 100% pure solid, corrosion-resistant material does not contain water or any organic solvents, the shrinkage rate after curing is 0, the protective layer is fine, and there are no pinholes to ensure that it will not fall off under wear and corrosion conditions.
2. Lightweight: with a density between 1.5g/cm-3.0g/cm, only a quarter of steel, it can reduce equipment load and improve equipment efficiency.
3. High hardness: According to the GB/T3398 testing standard, the Rockwell hardness reaches HR-109, far exceeding that of wear-resistant steel and stainless steel.
4. Widely applicable equipment, customizable: easy to form, can be processed according to customer drawing requirements, and the thickness can be adjusted according to the application environment. Widely used in equipment such as materials, slurries, and pneumatic conveying.