Description

Project Overview

With the rapid development of new energy industries, various types of waste batteries, including lithium-ion batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, are generated in increasing quantities. During waste battery recycling, the wastewater streams usually contain various sulfate compounds, such as nickel sulfate, cobalt sulfate, and manganese sulfate, resulting in complex water compositions and high treatment difficulties.

To address these challenges, evaporation and crystallization technology provides an effective solution by concentrating the sulfate-containing wastewater, recovering valuable salts, and minimizing wastewater discharge.

Process Technology   

A triple-effect forced circulation evaporator is applied to concentrate the desulfurization liquor containing nickel sulfate until an oversaturated condition is reached.

After concentration, the supersaturated slurry is transferred to a centrifuge for solid-liquid separation. The recovered nickel sulfate crystals are discharged as a valuable by-product or recycled for further utilization, while the separated mother liquor is returned to the evaporator system for further concentration, forming a continuous recycling process.

This closed-loop process improves resource utilization efficiency, minimizes wastewater discharge, and enhances overall economic benefits.

Key Features

• High-concentration operation 

Concentrating nickel sulfate solution to an oversaturated state, enabling efficient crystallization and recovery of valuable salts.

• Anti-scaling and anti-blocking design

Forced circulation evaporation technology effectively reduces the risk of heat transfer tube blockage caused by high-concentration nickel sulfate slurry. Meanwhile, the high circulation velocity minimizes scaling on heat transfer surfaces, improves heat transfer performance, extends continuous operation time, and reduces cleaning frequency.

• Mutiple-effect evaporation design

Significantly reduces steam consumption and improves energy efficiency.

• Integrated crystallization and mother liquor recycling system

Maximizes salt recovery and minimizes material loss.

• Automatic PLC control system

Ensures stable, safe, and continuous operation.

Main System Configuration

The complete system mainly consist of:

•  A triple-effect forced circulation evaporator system with titanium wetted parts for excellent corrosion resistance;

•  A centrifuge system integrated with mother liquor return circulation;

•  A condensate heat recovery system for improved energy efficiency and water utilization;

•  A PLC-based automatic control system for stable and reliable operation.

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