Description

Project Overview

Smelting wastewater typically contains high concentrations of dissolved salts, primarily sodium chloride and sodium sulfate, making conventional wastewater treatment both energy-intensive and challenging. Our Mechanical Vapor Recompression (MVR) evaporation system provides an efficient solution for concentrating high-salinity wastewater while recovering valuable salt crystals and significantly reducing wastewater volume.

By recycling the secondary vapor generated during evaporation, the MVR system minimizes fresh steam consumption, resulting in lower operating costs and improved energy efficiency.

Process Solution    

Our solution combines MVR technology with a forced circulation evaporator, ensuring stable and reliable operation when treating high-salinity smelting wastewater.

The wastewater is continuously concentrated to a supersaturated condition within the forced circulation evaporator. The concentrated slurry is then transferred to a centrifuge for solid-liquid separation, where salt crystals are recovered for disposal or potential reuse. The separated mother liquor is returned to the evaporator for further concentration, forming a continuous closed-loop process.

The secondary vapor generated during evaporation is compressed by the MVR compressor and reused as the heating source for the evaporator, significantly reducing external steam demand and overall energy consumption.

System Features

•  High Energy Efficiency

The MVR system fully recovers and reuses secondary vapor as the heating medium, greatly reducing steam consumption and lowering operating costs compared with conventional evaporation technologies.

•  Reliable Treatment of High-Salinity Wastewater

The forced circulation design effectively handles wastewater with high concentrations of dissolved salts while minimizing the risks of scaling and heat exchanger tube blockage. This ensures stable long-term operation with reduced maintenance requirements.

•  Continuous Salt Recovery

The system concentrates wastewater to a supersaturated state, allowing salt crystals to be separated by centrifugation. The mother liquor is recycled back to the evaporator for continuous concentration, maximizing salt recovery and minimizing wastewater discharge.

•  Intelligent Automatic Control

A DCS (Distributed Control System) provides automatic operation, real-time monitoring, and stable process control, ensuring safe and reliable plant operation.

Typical System Configuration

Our MVR Evaporator system for smelting wastewater treatment typically includes:

•  One set of forced circulation evaporator

•  One set of Mechanical Vapor Recompression (MVR) unit

•  One set of Preheater system 

•  One set of vapor-liquid separator with high-efficiency demister

•  One set of centrifuge for crystal separation

•  One set of DCS automatic control system

Key Advantages

•  Low energy consumption through MVR technology

•  Suitable for high-salinity smelting wastewater

•  Continuous salt crystallization and recovery

•  Reduced scaling and fouling

•  Stable and reliable continuous operation

•  Lower maintenance requirements

•  Automated process control

•  Reduced operating costs and environmental impact

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