In the comprehensive development and utilization of high-magnesium brine resources, the extraction and removal of boric acid are critical steps for enhancing product value and purifying subsequent processes. However, challenges such as the high magnesium-to-boron ratio, low efficiency of traditional methods, and high operational costs have long troubled enterprises. Tiei Extraction's CWL-M series centrifugal extractor, combined with solvent extraction technology, provide a mature, efficient, and cost-effective full-process solution.

Efficient Boron Removal Process from High-Magnesium Brine

The core of this process lies in utilizing a specific extractant with selective complexation capability for boron, combined with the centrifugal extractor that enables rapid phase separation and efficient mass transfer. The entire system operates in a closed loop with a high degree of automation.

1.Pretreatment and Preparation
The boron-containing high-magnesium brine is filtered to remove suspended solids. Depending on the brine characteristics, the pH value is adjusted appropriately to optimize subsequent extraction efficiency.

2.Centrifugal Extraction
Mixing and Mass Transfer: The pretreated brine and a specially formulated boron-complexing extractant are fed proportionally into the centrifugal extractor.
Rapid Separation: Under centrifugal forces of several thousand Gs, even two phases with minimal density difference (the extract phase and raffinate phase) can be instantaneously and completely separated. The boron-enriched extract phase (organic phase) is discharged from the light-phase outlet, while the boron-depleted brine (aqueous phase) is discharged from the heavy-phase outlet.

3.Stripping and Regeneration
The boron-loaded organic phase enters the stripping stage, where it contacts a dilute acid (such as sulfuric acid) or pure water.
Inside the centrifugal extractor, boron is stripped into the aqueous phase, forming a boron-rich solution suitable for subsequent concentration and crystallization to produce high-purity boric acid.
The regenerated extractant is recycled back to the extraction stage, significantly reducing operating costs.

4.Downstream Processing
The boron-rich solution undergoes evaporation, cooling, crystallization, and drying to yield a high-purity boric acid product.
The boron-depleted brine can then be further utilized for the extraction of valuable elements such as magnesium and lithium.

The Core Advantages of Centrifugal Extraction

As the heart of the process, the CWL-M centrifugal extractor transforms its unique design advantages into a key source of competitiveness for production line:

1.Optimized for Difficult-to-Separate Systems
The CWL-M centrifugal extractor demonstrates exceptional adaptability to high-magnesium brine systems with small density differences and strong emulsification tendencies. It ensures complete phase separation and effectively eliminates issues such as leakage, carryover, and phase entrainment.
2.Continuous Operation with High Automation
The centrifugal extractor enables fully automatic, 24-hour continuous operation, greatly reducing manual intervention and significantly improving production efficiency.
3.Short Residence Time and Minimal Material Degradation
The contact time between the two phases inside the centrifugal extractor is extremely short (on the order of seconds), effectively minimizing extractant degradation and evaporation losses, and ensuring long-term system stability.
4.Compact Design with Small Footprint
A single centrifugal extractor is equivalent to multiple mixer-settler stages. Its compact, modular design allows for flexible on-site layout and easy capacity expansion.
5.Environmentally Friendly and Cost-Effective Operation
The extractant operates in a closed-loop cycle with minimal consumption. No solid waste is generated, and the burden of “three wastes” (waste gas, wastewater, and solid waste) treatment is greatly reduced, resulting in a more economically competitive overall operating cost.

“Solvent Extraction + Centrifugal Extractor” process provides a technologically advanced and economically feasible solution to the challenge of boron extraction from high-magnesium brine. It not only enhances resource recovery and product value, but also, with its continuous and automated operation, aligns perfectly with the modern chemical industry’s pursuit of green, efficient, and sustainable development.
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