Controller — Acids
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What LibertyCES's vendor documentation shows
Chrome reduction: pH lowered to 2.0-2.5 via acid dosing, ORP setpoint -300mV, explicit SO2 gas-release hazard if overdosed.
Materials documented for this service
- N/A
Products cited for this service
Real Specifications
| Chrome reduction optimum pH range | pH 2.0-2.5 | gf-signet-application-solutions.md |
| Chrome reduction minimum detention time | 15 minutes | gf-signet-application-solutions.md |
| Chrome reduction ORP setpoint | -300mV (-400mV max) | gf-signet-application-solutions.md |
| Cyanide destruction stage 2 (sulfuric acid) detention time | Up to 4 hours (modern systems) | gf-signet-application-solutions.md |
| Cyanide destruction stage 1 oxidation target | Below 0.1 ppm | gf-signet-application-solutions.md |
GF Signet warns explicitly that lowering pH further than the 2.0-2.5 optimum on chrome reduction risks releasing hazardous sulfur dioxide gas — the reaction only needs to reach pH 3.0 before it slows significantly, so overshooting low doesn't buy faster reduction, it buys a gas hazard.
Chrome reduction is regulatorily strict for a reason — hexavalent chromium is roughly a thousand times more toxic than trivalent chromium per GF Signet's own literature, and it won't form a settleable hydroxide precipitate until it's reduced. Getting the pH/ORP control loop right (2.0-2.5 pH, -300mV ORP, 15-minute minimum detention) is the difference between a compliant discharge and a violation, which is why Liberty CES treats this controller spec as safety-critical rather than a tuning nicety.
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
Is Controller compatible with Acids?
Chrome reduction: pH lowered to 2.0-2.5 via acid dosing, ORP setpoint -300mV, explicit SO2 gas-release hazard if overdosed. This is strong evidence.
What materials are documented for Controller in Acids service?
Materials documented for this service: N/A. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm with a spec review before final specification.
What specific Acids chemicals does this cover?
Named chemicals in this documentation: Sulfuric Acid (chrome reduction/cyanide destruction stage 2).
What products are cited for Controller in Acids service?
Documented examples include GF Signet controller.
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