Two Phase Solid Liquid Centrifuge

Two-phase solid-liquid separation is one of the most fundamental and widely used unit operations across virtually every industry, including chemical processing, pharmaceutical manufacturing, food and beverage production, mining and minerals, wastewater treatment, and biotechnology. The objective of two-phase separation is to separate a mixture of solid particles and liquid into two distinct streams: a clarified liquid phase (free of suspended solids) and a concentrated solid phase (dewatered cake). Traditional solid-liquid separation methods including filter presses, vacuum filters, settling tanks, and conventional centrifuges each present significant limitations. Filter presses and vacuum filters operate in batch mode, require labor-intensive cake discharge and filter media replacement, and are prone to blinding from fine particles. Settling tanks are extremely slow (hours to days) and produce only partial separation. Conventional centrifuges may not provide the high G-force required for fine particles or the continuous solids discharge needed for high-volume applications. Our Two Phase Solid Liquid Centrifuge has been specifically engineered to overcome these limitations through high-speed, continuous centrifugation that efficiently separates solids from liquids with high throughput, low product loss, and automated solids discharge. The decanter or disc stack design provides an exceptionally large effective settling area within a compact footprint, enabling processing of solid-liquid mixtures at flow rates from 100 to 100,000 liters per hour. The high-G design (up to 4,000 x g for decanter, up to 12,000 x g for disc stack) provides the driving force needed to separate fine particles (down to 0.5-5 micrometers). The continuous solids discharge mechanism (scroll conveyor for decanter, partial ejection for disc stack) removes solids without interrupting operation, enabling 24/7 unattended processing. The low-shear feed inlet and gentle solids handling prevent particle breakage, which is critical for preserving crystal size distribution and product value. All product-contact surfaces are manufactured from wear-resistant materials (Duplex stainless steel, high-chrome iron, tungsten carbide) for abrasive solids, or electro-polished SUS316L for pharmaceutical/food applications. The system is fully enclosed with CIP capability and available with inert gas purging for solvent applications. The two-phase centrifuge has been validated for a wide range of applications including chemical catalyst recovery, pharmaceutical intermediate isolation, mineral concentrate dewatering, pigment classification, starch dewatering, biological sludge dewatering, and fine chemical purification. For each application, the operating parameters including G-force, feed rate, differential speed (decanter), pool depth, and discharge interval can be optimized to achieve maximum solids recovery and liquid clarity. The control system continuously monitors key parameters including feed rate, bowl speed, torque, discharge cake solids, and centrate clarity, providing real-time feedback for process optimization. For the decanter configuration (horizontal scroll discharge centrifuge), the continuous screw conveyor transports settled solids to the conical discharge end, producing a dry, transportable cake (typically 20-50% solids depending on material). For the disc stack configuration (vertical disc centrifuge with partial ejection), the intermittent ejection mechanism removes concentrated solids (typically 15-30% solids) while the bowl continues rotating.

The decanter centrifuge design is typically preferred for applications with high solids content (5-50% solids by volume) where maximum cake dryness is required. The decanter consists of a rotating bowl with an internal scroll conveyor that rotates at a slightly different speed (differential speed of 5-30 rpm). As the solid-liquid mixture enters the bowl, centrifugal forces up to 4,000 x g drive solids to the bowl wall, where the scroll conveyor transports them to the conical discharge end for continuous discharge. The clarified liquid flows to the opposite end and discharges over adjustable weir plates. The differential speed and pool depth can be adjusted to optimize cake solids and liquid clarity. For applications with fine particles or low solids concentration (0.1-5% solids), the disc stack centrifuge is typically preferred. The disc stack design provides a much larger effective settling area, enabling higher throughput with fine particles. The partial ejection mechanism removes accumulated solids without stopping the machine. The two-phase centrifuge is available in both configurations, with the optimal choice depending on solids concentration, particle size distribution, and required cake dryness. For multi-product facilities, interchangeable disc stacks and adjustable decanter geometry allow a single centrifuge to handle a wide range of materials. The combination of high G-force, continuous solids discharge, and hygienic design makes our two-phase centrifuge the preferred choice for solid-liquid separation across all industries.

Our Two Phase Solid Liquid Centrifuge incorporates several advanced features specifically designed for solid-liquid separation. The feed system includes a low-shear inlet and variable-speed feed pump. The control system provides comprehensive monitoring and automation, built around a Siemens S7-1500 or Allen-Bradley ControlLogix PLC with a 15-inch full-color touchscreen HMI. The user interface presents key parameters including bowl speed, differential speed, feed rate, torque, cake solids, and centrate clarity. The system supports full recipe management for different products, remote monitoring, and data logging. The combination of robust mechanical design and advanced process control makes our centrifuge the preferred choice for solid-liquid separation worldwide.