W&T independently developed core technologies to tailor-make flash evaporation Angle regulating valves for harsh working conditions such as hydrometallurgical pressurized leaching

Pressure leaching is a hydrometallurgical technology that extracts metals from ores using acid or alkali solutions under high temperature and pressure. It increases the leaching rate and reduces reagent consumption by raising the temperature and pressure. The main processes are: staged preheating → autoclave leaching → flash evaporation cooling → separation and purification.

In the hydrometallurgical pressure leaching process, the high-temperature and high-pressure pulp discharged from the autoclave usually needs to be depressurized and cooled through two or more flash tanks before solid-liquid separation. The regulating Angle valve at the feed port of the flash tank is responsible for controlling the liquid level and flow rate, which is related to the safety of the system. The working conditions of this valve are extremely harsh: the acidic pulp is highly corrosive, the high-solid particles are highly erosive, accompanied by flash evaporation and cavitation. Conventional valves have a short service life and a high failure rate, which has become a production bottleneck restricting the long-term stable operation of the production line.

    The flash regulating Angle valve of W&T Fluid Control Co., Ltd. is designed for this harsh working condition. Relying on its independently developed core technology, it is specially tailored for harsh working conditions such as pressure leaching in hydrometallurgy, and has become a breakthrough equipment in the industry. The product abandons the traditional "preventing flash evaporation" approach and adopts the "guiding rather than preventing" design concept. It integrates the Venturi principle, carefully selects wear-resistant and corrosion-resistant materials, and optimizes the flow channel structure through CFD to control flash evaporation in the central area and minimize equipment damage to the greatest extent. W&T has optimized materials and processes, achieving a breakthrough in Russian gold mines. Its hydrometallurgical flash control Angle valve performs exceptionally well in flash fluids containing abrasive particles, capable of withstanding flow rates close to the speed of sound and corrosive fluids, with a significantly extended lifespan.

By precisely regulating the flow rate, pressure and liquid level of high-temperature and high-pressure pulp, the Vitrification technology effectively accelerates the leaching reaction, stabilizes process parameters, significantly reduces reagent consumption and energy loss, and greatly improves the metal leaching rate and resource utilization rate. From precise control of the liquid level in the reactor to efficient maintenance of flash evaporation thermal balance, from solving the problem of medium crystallization jamming to avoiding the risk of cavitation vibration, the Viti solution comprehensively optimizes the hydrometallurgical process flow, helping enterprises break through production bottlenecks and achieve the triple goals of energy conservation, efficiency improvement, and stable operation, providing a strong guarantee for the efficient production of projects.

 The technical advantages of W&T in the application of ceramic internals include

    A variety of ceramic materials are available: According to the specific requirements of erosion resistance, chemical compatibility, thermal shock resistance and fracture resistance of the working conditions, Vitite provides multiple ceramic material solutions such as zirconia, silicon nitride and silicon carbide, and experienced engineers recommend the best choice for customers.

    Intelligent thermal fit design: The ceramic valve core and seat adopt a sophisticated thermal fit assembly process, achieving modular and precise assembly based on the principle of thermal expansion and contraction. There is no need for adhesive or mechanical fixation, which not only ensures assembly accuracy but also avoids the risk of adhesive aging and failure

    Ceramic spraying process: For components that require the strength of a metal substrate, Viti employs advanced ceramic spraying technology to form a dense ceramic coating on the metal surface, which combines the toughness of metal with the hardness and corrosion resistance of ceramics

    Clamping valve core ring design: The unique clamping structure does not require cage or threaded connections, avoiding possible jamming when in contact with process fluids. Disassembly is simple and convenient. Just unscrew the valve from the pipeline and replace the valve core ring

    Selection of anti-corrosion materials

Vitel offers comprehensive material solutions for chloride and fluoride ion corrosion in acidic pulp:

    Metal materials: 316L stainless steel, duplex stainless steel (2205/2507), titanium, Hastelloy, etc.

    Non-metallic linings such as PTFE and PFA, in combination with ceramic spraying technology, effectively prevent full-state corrosion caused by chloride ions and hydrofluoric acid.

    W&T has always adhered to the principle of "quality as the root and service as the foundation", forging outstanding product performance with strict standards and empowering industry development with full-cycle customized services. The product has undergone full-process quality inspection and extreme working condition tests. In the nickel-cobalt pressurized leaching project, its service life is several times longer than that of traditional valves (3-6 months). It operates stably and reliably continuously, significantly reducing the frequency of unplanned shutdowns and maintenance.

Abandoning the standardized model, we offer one-on-one full life-cycle customized services: precise on-site survey of working conditions in the early stage and in-depth matching of process requirements. Mid-term customized design and production, modular assembly and debugging; Post-sale full-process operation and maintenance support, and rapid response to spare parts demands. From the successful breakthrough in the Russian gold mine project to the stable application in multiple large-scale hydrometallurgical projects in China, Viti products have gained high recognition from customers with their hard-core qualities of long service life, high efficiency and low maintenance.

Deeply engaged in the field of fluid control, W&T drives product upgrades through technological innovation, builds a solid industry reputation with meticulous quality, and empowers customer development with customized services. In the future, Viti will continue to focus on the hydrometallurgy field, constantly break through the technical bottlenecks of harsh working conditions, provide more efficient, reliable and intelligent fluid control solutions for the extraction industry of non-ferrous metals and rare metals, and help China's hydrometallurgy industry embark on a new journey of higher-quality development.