Measurement of Caustic Soda Concentration in Sodium Aluminate Solution

Based on the chemical characteristics of sodium aluminate solutions and integrating technologies such as optics and electrochemistry, we have developed a proprietary model for sodium aluminate solutions. This model enables precise measurement of alkali liquor concentrations throughout the entire Bayer process for alumina production. Tailored to the specific application requirements of different process stages—such as scale formation and slurry erosion—we have custom-designed alkali liquor line measurement systems equipped with automatic cleaning mechanisms, as well as specialized ceramic and hydrodynamic sensors for slurry monitoring. Accurate, real-time, and continuous measurements significantly reduce reliance on laboratory sampling analyses and mitigate delays and control shortcomings associated with traditional methods. Prolisen offers comprehensive solutions leveraging these sensors to automate both leaching and evaporation processes. To date, our solutions have been installed in over 1,000 facilities across countries including Australia, China, Brazil, Indonesia, Dubai, Saudi Arabia, Vietnam, and India.

Measurement of Caustic Soda Concentration in Sodium Aluminate Solution Slurry

Based on the chemical characteristics of sodium aluminate solutions and integrating technologies such as optics and electrochemistry, we have developed a proprietary model for sodium aluminate solutions. This model enables real-time measurement of alkali liquor concentrations throughout the entire Bayer process for alumina production. Tailored to the specific application requirements of different process stages—such as scale formation and slurry erosion—we have custom-designed alkali liquor measurement systems equipped with automatic cleaning mechanisms, as well as specialized ceramic and hydrodynamic sensors for slurry applications. These precise, real-time, and continuous measurements significantly reduce reliance on laboratory sampling analyses and mitigate the drawbacks associated with delayed control. Praisen offers solutions that leverage these sensors to automate both digestion and evaporation processes. We have installed our systems in over 1,000 facilities across countries including Australia, China, Brazil, Indonesia, Dubai, Saudi Arabia, Vietnam, and India.

RP/αK measurement of sodium aluminate solution

Based on the chemical characteristics of sodium aluminate solutions and leveraging optical, electrochemical, and other advanced techniques, a dedicated modeling framework has been developed to enable real-time measurement of RP and αK concentrations throughout the entire Bayer‑process alumina production cycle. Tailored ceramic and fluid‑mechanics‑optimized slurry sensors have been custom‑designed to address the specific operational challenges of each process stage, such as scale formation and slurry erosion. Accurate, real‑time, continuous measurements reduce reliance on laboratory sampling and analysis while mitigating the drawbacks of delayed control. Plasen offers comprehensive solutions that integrate these sensors to automate digestion and evaporation processes. Over 500 installations have been deployed in countries including Australia, China, Brazil, Indonesia, Dubai, Saudi Arabia, Vietnam, and India.

Mud Layer Interface Meter

The Praisson Sludge Layer Interface Instrument is an intelligent measurement system integrating multiple measurement functions. The measurement parameters include: The Praisson Sludge Layer and Tank Profile Measurement System provides the following measurement indicators for the alumina separation and washing process: liquid level height, clear liquid layer height, turbidity of the clear liquid layer, caustic soda concentration in the clear liquid layer, settling layer height, and sludge layer height. By delivering precise measurements and outputs, this system also enables the implementation of an automatic control system for sedimentation using the Praisson Sludge Layer Interface Instrument. Unlike non-contact methods (which rely on temperature measurements to determine sludge levels), the contact-based method uses the turbidity of the clear liquid layer to monitor the turbidity of the overflow liquid in real time online. Additionally, by measuring the height of the settling layer and the clear liquid layer and setting alarm thresholds, this method effectively prevents the tank from becoming cloudy due to overflow. Real-time measurement of the settling layer height allows for automated adjustment of the flocculant dosage, significantly optimizing the amount of flocculant added. Measurement of the caustic soda concentration in the clear liquid layer enables real-time monitoring of the caustic soda concentration in the overflow liquid, which is crucial for controlling the efficiency of subsequent decomposition processes.