Metering/Dispensing System — Caustics/Bases
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LibertyCES has documented Metering/Dispensing System in Caustics/Bases service, including Sodium Hydroxide. Wetted materials to confirm: PVC/PP dosing skid. Documented models include GF Signet precision dosing systems. Compatibility depends on exact concentration, temperature and duty cycle, so confirm with a free spec review.
Notes from the vendor documentation
Cyanide destruction batch process explicitly doses NaOH via precision dosing pump/system to reach pH 11.5 setpoint.
Materials documented for this service
- PVC/PP dosing skid
Products cited for this service
Real Specifications
| Spec | Value | Source document |
|---|---|---|
| Cyanide destruction Stage 1 pH setpoint | pH 11.5, held via small NaOH adjustments | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Stage 1 ORP oxidation target | ORP raised to +450mV via chlorine addition | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Two-Step process oxidation target | Oxidation to below 0.1 ppm (cyanide → cyanate) | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Two-Step Stage 2 detention time | Up to 4-hour detention time in modern systems, pH lowered with sulfuric acid | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Post-neutralization bath monitoring target | 9.5 pH, 450 mV oxidation level maintained | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
GF Signet's own process documentation warns that acid injection must be manually locked out during Stage 1 of batch cyanide destruction — letting pH drop below 11 risks releasing toxic cyanogen chloride gas and stops the cyanide-to-cyanate oxidation from completing properly.
A NaOH dosing skid quoted for cyanide destruction isn't just about hitting a pH number — GF Signet ties the pH 11.5 setpoint directly to a gas-release safety threshold, which means the acid-injection interlock logic matters as much as the pump's turndown ratio.
Every material and product claim on this page traces to real, vendor-published documentation on file with LibertyCES. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm current specifications with the manufacturer and request a spec review before final specification.
FAQ
Can Metering/Dispensing System handle Caustics/Bases?
Cyanide destruction batch process explicitly doses NaOH via precision dosing pump/system to reach pH 11.5 setpoint.
What wetted materials should Metering/Dispensing System use in Caustics/Bases service?
Materials documented for this service: PVC/PP dosing skid. Compatibility depends on exact concentration, temperature and duty cycle, so confirm with a spec review before final specification.
Which Caustics/Bases chemicals does this cover?
Named chemicals in this documentation: Sodium Hydroxide.
Which Metering/Dispensing System models are documented for Caustics/Bases?
Documented examples include GF Signet precision dosing systems (cyanide destruction NaOH+chlorine).
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Reviewed by James Riggins, 30+ years specifying water and chemical process equipment · Updated