Stop metal losses in processes with Sulphide, Cyanide, Ammonia and Pressure Fluctuations

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Courtesy of IC Controls Ltd.

Abstract
Losses of metal are often traced to incorrect pH/ORP signals in floatation, leaching, extraction, electrolysis, and precipitation processes, aggravated by pressure changes. IC Controls a Canadian mining sensor manufacturer developed a new superior pH/ORP sensor that stops metal losses, reduces environmental footprint and contributes to sustainability. The cause of incorrect pH/ORP signal is rooted in the reference junction. Reference Junctions are designed to allow diffusion of reference chloride ions into the process to complete the electric circuit for measurement. Unfortunately, it also allows process ions to diffuse into the reference. These ions react with reference electrolyte components causing the signal to change, drifting from the desired process value. With fluctuating process pressure, ion in migration also dilutes the electrolyte producing similar signal drifts. If process ion diffusion could be stopped, the pH/ORP signal would be accurate. IC Controls new pH/ORP sensor stops process ion diffusion, and remains accurate over long periods. Similar to IC Controls proven model 642 Mining pH sensor, it is designated model 647. Model 647 contributes to sustainability through reducing disposal costs from waste reagents, lost metal, and fewer used sensors. Conclusions: 1. This development will be important to Mines and Hydro-metallurgists where Sulfide, Cyanide, Ammonia and other poisoning ions are present in the process, as stable pH reading and better metal recovery become possible. 2. Model 647 contributes to sustainability through reducing disposal costs from waste reagents, lost metal, and fewer used sensors. 3. New processes using higher pressure and fluctuating pressurized reactors will greatly benefit from stable pH readings.

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