High temperature agitated slurry nickel ore mixtures & solvent extractions (SX) - Case Study
High Temperature Agitated Slurry Nickel Ore Mixtures & Solvent Extractions (SX)
- Agitated heavy slurry mixtures are endured by the sensor by use of a strong break resistant thick-wall pH glass element (nearly unbreakable in most mining slurries)
- Build up on reference element is minimized by solid state reference system, which also allows for aggressive chemical and mechanical cleaning
- Retrofit sensor can connect to almost any existing pH Transmitter
- Advanced waterproofing assembly allows for continuous submersible installation with little or no solution intrusion onto cable from back of probe
- Unique sealing technology that is custom built and engineered for mining applications allows for continuous and aggressive dissolved ammonia gas exposure
- Unique organic solvent & hydrocarbon resistant reference systems and sealing technology allow for continuous submersed sensor use with little degradation
The Problems
A nickel mining company wanted to perform pH measurement for sulfide removal by ammonia injection (leaching) and solvent extraction (SX) portions of their nickel extraction operations. The high temperature, heavy agitated slurry mixtures with the presence of dissolved hydrogen sulfide and ammonia gas is quite similar to that which is described in far greater detail in ASTI’s case study # 5 problem section. The solvent extraction process utilizes significant amounts of kerosene, other hydrocarbons and solvents. These extraction agents in combination with the complex slurry ore mixture present a corrosive and aggressive process media for measurement. Previously used sensors required frequent cleaning and recalibration due to organic coating on the sensors. The need for frequent maintenance accelerated the previously used sensor’s demise because the frequent removal from the process resulted in performance degradation due to repeated temperature cycling.
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