The objective of brine purification is to remove impurities such as calcium, magnesium, and sulfate from raw salt, providing high-quality primary brine for ion-exchange membrane electrolysis. Precise control of brine chemistry is critical to prevent membrane fouling, extend operational life, and optimize electrolysis efficiency.
1. Key Process Control Points
Effective purification relies on continuous monitoring of chemical and physical properties throughout the pretreatment stages.
Item | Process Location | Parameter | MZD Analytical Strategy |
1 | Raw Salt | Moisture | Moisture Analyzer (control ≤3%) |
2 | Dissolved Salt Brine | pH | Solid-State Reference pH/ORP Analyzers (range 9–11) |
3 | Dissolved Salt Brine | Turbidity | Turbidity Analyzer (range 0–100 NTU) |
4 | Dissolved Salt Brine | ORP | Solid-State Reference pH/ORP Analyzers (reflects reducing substances) |
5 | Clarification Tank | Turbidity | Turbidity Analyzer (evaluating clarification performance) |
6 | Sand Filter Outlet | Turbidity | Turbidity Analyzer (ensure ≤5 mg/L) |
8 | Gore Membrane Filter | Turbidity | Turbidity Analyzer (ensure ≤1 mg/L for high purity) |
10 | Reaction Tank | pH | Solid-State Reference pH/ORP Analyzers for magnesium removal optimization |
Process Navigation: To review the entire plant workflow from raw brine to final environmental compliance, return to the Chlor-Alkali Process: Analytical Measurement Solutions Overview.
2. Advanced MZD Instrumentation for Brine Applications
MZD Analytik provides specialized sensors designed to withstand the harsh, high-salinity environments characteristic of brine processing.
Solid-State Reference pH/ORP Analyzers
Traditional pH electrodes often suffer from KCl diffusion and junction contamination in high-salinity brine. MZD's solid-state reference technology utilizes an electrochemically active, non-porous polymer junction that eliminates electrolyte leakage and clogging.
Performance: <5-second response time and <1 mV monthly drift.
Benefit: 3–5 times longer service life than conventional electrodes, maintaining ±0.05 pH control accuracy in high-salinity media.
Corrosion-Resistant Turbidity Analyzers
Our turbidity solutions utilize a corrosion-resistant optical structure to provide high accuracy in measuring suspended solids in brine, even after filtration processes. This is essential for monitoring the health of Gore membrane filters and protecting downstream chelating resin towers.
For raw salt feed, our non-contact electromagnetic moisture analyzer monitors moisture on the conveyor belt. By maintaining moisture levels ≤3%, plants can significantly reduce steam consumption during the dissolution process, optimizing overall energy efficiency.
3. Operational Benefits
Membrane Longevity: By strictly controlling brine purity, MZD instrumentation directly protects the expensive ion-exchange membranes from scaling and poisoning.
Reduced Maintenance: The maintenance-free nature of our solid-state reference electrodes reduces manual intervention in high-salinity and strongly corrosive areas.
Process Optimization: Precise pH and ORP monitoring allows for tighter control of chemical dosing, reducing chemical consumption by 15–20%.
4. Related Process & Technical Sections
Continue exploring our specialized chlor-alkali application segments and underlying measurement technologies:
Electrolysis & Dechlorination Process ( incl. Hydrogen Safety )
Core Analytical Technologies & Instrument Profiling (Technical Column)
For detailed technical datasheets or site-specific application consultation, please contact our support team at sales@mzdd.de.