Recirculation Slurry (Blowdown) Parameters




Method Overview

  • Typically a grab sample from the recycle slurry
  • Sampled in accordance with EPRI Method A1.

Target Compounds

  • pH - on-site;
  • Density - on-site;
  • Suspended Solids content;
  • Dissolved Solids content;
  • Liquid content;
  • Calcium/Magnesium;
  • Carbonate content;
  • Sulfate content;
  • Sulfite content;
  • Alkalinity;
  • Inerts;
  • Slurry Particle Size Distribuiton.

Performance Tips

Parameter Suggested Method of Analysis Description of Method Suggested Frequency Use of data
pH EPRI Method C1 On-site using 2-Buffer Method calibration with pH meter Start and finish of each performance test run. Troubleshoot pH and maintain process efficiency
Density EPRI Method D2 On-site using pre-calibrated pycnometer. Start and finish of each performance test run. Calibrate density meter and maintain process efficiency
Slurry suspended solids content EPRI Method F1 Gravimetric Start and finish of each performance test run. Calibrate density meter and maintain process efficiency
Carbonate EPRI Method N1 CO2 evolution, Ba(OH)2 absorption, Acid-base titration Start and finish of each performance test run. Measuere alkali loss in filter cake of mag-lime process; important for mag-lime or sodium systems.
Alkalinity EPRI Method N3 Titrimetric Start and finish of each performance test run. Measuere alkali loss in filter cake of mag-lime process; important for mag-lime or sodium systems.
Calcium and Magnesium EPRI Method J3 EDTA Titration Start and finish of each performance test run. To determine stoichiometry and monitor process chemistry
Inerts EPRI Method J1 Acid Dissolution Start and finish of each performance test run. Quality indicator. Important for gypsum systems.
Dissolved solids content (TDS) EPRI Method E1 Gravimetric Start and finish of each performance test run. Calibrate density meter for dissolved solids
Sulfate (SO4=) EPRI Method L2 Wet chemistry methods Start and finish of each performance test run. To calculate stoichiometry and monitor process chemistry.
Sulfite (SO3= or CaSO3.1/2H2O) EPRI Method M1 Iodometric titration Start and finish of each performance test run. To calculate stoichiometry and monitor process chemistry.
Lime slurry particle size distribution EPRI Method G1 Wet Sieve Start and finish of each performance test run. Troubleshooting problems in milling circuit or process such as low utilization or poor gypsum quality

Shipping

  • Acetone must be shipped as a hazardous material. Please call for IATA codes if you need them.
  • Samples may be shipped at ambient temperatures (or at preservations temperatures specified by individual parameter);
  • It may prove more economical to keep acetone rinses separate, ship other samples normally, and the acetone as hazardous.
  • Be sure to include a chain of custody for each shipping container.

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