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Background A sand washing plant was experiencing frequent wear inside its hydrocyclone system. The hydrocyclone was used for fine particle separation, mud removal, and sand classification. Because the slurry contained abrasive sand particles and operated at high velocity, the internal wall of the cyclone was exposed to continuous impact and erosion. At the beginning of the operation, the system could maintain normal classification performance. However, after several months of use, the plant began to notice changes in the hydrocyclone’s performance. The inner wall became rough, the liner showed local wear, and the classification result became less stable. Maintenance teams had to inspect and repair the cyclone more frequently, which increased downtime and labor costs. The customer’s main concern was not simply replacing a worn liner. Their real concern was production stability. Every shutdown affected the sand washing line, reduced output, and increased the pressure on maintenance planning. The Problem The original liner material could not provide enough resistance against long-term slurry abrasion. In this type of working condition, sand particles continuously hit the cyclone wall under high-speed rotational flow. The most serious wear usually appears near the feed inlet, cone section, and underflow area. Once these areas are worn, the internal geometry of the cyclone changes, which affects the slurry flow pattern. The plant faced several practical problems: Frequent liner inspection and replacement Localized wear near high-impact areas Unstable classification performance after internal surface wear Higher spare parts and maintenance labor costs Production interruptions caused by unplanned maintenance For the plant manager, the biggest issue was that the hydrocyclone had become a maintenance-sensitive component. Even if the replacement cost of each liner was acceptable, the hidden cost of shutdown was much higher. Root Cause Analysis After reviewing the operating conditions, the main cause was identified as high-abrasion slurry impact. The hydrocyclone was handling sand and slurry with continuous particle movement. Under centrifugal force, abrasive particles repeatedly contacted the internal wall. Traditional metal or rubber surfaces could not maintain their shape and smoothness for long periods under these working conditions. The problem was not only material wear. Once wear developed on the inner wall, the cyclone’s separation environment also changed. The flow became less stable, and this affected classification consistency. In other words, the liner was not just a protective layer. It directly influenced the equipment’s operating performance. Engineering Solution To improve wear resistance and stabilize long-term operation, a hydrocyclone with 95% alumina ceramic lining was recommended. The solution used a metal shell as the structural body and high-density alumina ceramic tiles as the internal wear protection layer. The ceramic lining was designed according to different areas of the hydrocyclone, including the cylinder section, cone section, feed inlet, overflow area, and underflow nozzle. Small ceramic tiles were used to match the curved internal surface. This allowed the ceramic lining to fit the cyclone geometry more closely and reduce gaps between tiles. A staggered ceramic layout was selected for better bonding stability. During installation, the internal surface was cleaned and prepared before ceramic bonding. The ceramic tiles were installed tightly, and the gaps were controlled to help prevent slurry penetration behind the liner. After curing, the inner surface formed a smooth and wear-resistant protection layer. Why 95% Alumina Ceramic Was Selected 95% alumina ceramic was selected because it provides high hardness, strong abrasion resistance, and good stability under slurry erosion. Compared with rubber liners, ceramic lining has much higher resistance to hard particle impact. Compared with metal liners, ceramic does not suffer the same level of erosion and corrosion under abrasive slurry flow. For this application, the plant needed a lining material that could do more than survive wear. It had to maintain a smooth flow surface and support stable classification performance over time. This is why alumina ceramic was a better choice than simply increasing metal thickness. Result and Value After upgrading to the ceramic-lined hydrocyclone, the plant expected a significant improvement in service life and maintenance stability. The ceramic lining provided a more durable internal wear surface, reducing the need for frequent liner replacement. The smoother inner wall also helped maintain a more stable slurry flow path, supporting consistent particle classification. The key value for the customer included: Longer hydrocyclone liner service life Reduced maintenance frequency Lower spare parts consumption Less unplanned downtime More stable classification performance Lower total maintenance cost over time For the plant, the most important benefit was not only the ceramic material itself, but the improvement of production continuity. When the hydrocyclone runs longer without frequent maintenance interruption, the entire sand washing system becomes easier to manage. Engineering Conclusion In abrasive slurry systems, hydrocyclone wear is not just a spare parts problem. It is a production stability problem. If the internal surface wears too quickly, the classification system becomes unstable, maintenance costs increase, and plant operation becomes harder to control. The 95% alumina ceramic-lined hydrocyclone provides a practical solution by protecting the internal wear surface directly. For sand washing plants, mining beneficiation systems, coal preparation plants, and other slurry classification operations, ceramic lining can help extend service life, reduce downtime, and improve long-term operating reliability.

Project Background A thermal power plant operating multiple fly ash collection and conveying systems was experiencing persistent maintenance issues with its rotary discharge valves. The plant used conventional alloy steel rotary valves beneath baghouse dust collectors to discharge fly ash into a dense-phase pneumatic conveying system. Although the valves met the original design specifications, actual operating conditions proved far more demanding than anticipated. The fly ash contained a high percentage of hard silica particles, resulting in continuous erosion of the rotor blades and valve chamber. Challenges Faced by the Customer Within several months of operation, maintenance personnel observed significant wear in the rotor assembly. The primary problems included: Increasing air leakage Loss of conveying pressure stability Reduced feeding consistency Frequent valve replacement Unexpected production interruptions Maintenance records showed that each shutdown required not only valve replacement but also line cleaning and system recalibration, increasing labor costs and reducing overall plant efficiency. The customer was seeking a longer-term solution capable of surviving continuous abrasive service. Solution Implemented After reviewing the operating conditions, an alumina ceramic-lined rotary discharge valve was selected. The replacement valve featured: CF8 stainless steel valve body High-purity alumina ceramic-lined rotor Fully ceramic-lined rotating chamber Integrated ceramic bushing structure Precision ceramic-to-ceramic sealing surfaces Unlike conventional wear-resistant coatings, the ceramic liner formed the primary wear surface throughout the material contact zone. This design prevented direct exposure of the metal structure to abrasive fly ash Operational Results Following installation, plant operators monitored the valve during routine inspections. Several performance improvements became immediately apparent. First, conveying pressure remained significantly more stable because internal clearances showed minimal wear progression. Second, the ceramic-lined surfaces reduced material accumulation inside the valve chamber, helping maintain consistent discharge performance. Most importantly, the valve demonstrated substantially longer operational life compared with the previous alloy steel design. The maintenance team reported a significant reduction in unscheduled downtime, allowing maintenance resources to be allocated to other critical equipment. Engineering Analysis The success of the project was largely attributed to the wear resistance of high-purity alumina ceramic. In fly ash conveying applications, wear occurs primarily through particle impact and sliding abrasion. Traditional metal surfaces gradually deform and erode under these conditions. Alumina ceramic, however, maintains its dimensional stability and surface integrity for much longer periods, preserving both sealing performance and feeding accuracy. Because wear progression is dramatically slowed, the entire conveying system benefits from improved reliability. Conclusion For facilities handling fly ash, cement powder, silica powder, mineral fines, or battery materials, rotary valve wear is often one of the leading causes of maintenance-related downtime. This project demonstrates that upgrading to a ceramic-lined rotary discharge valve can significantly improve operational reliability, reduce maintenance frequency, and lower overall lifecycle costs. Rather than repeatedly replacing worn metal components, many plants are now investing in wear-resistant ceramic technology to achieve longer production cycles and more predictable equipment performance.