Gypsum Parameters




Method Overview

  • Typically a grab sample from the solids drying belt.
  • Sampled in accordance with EPRI Method A1.

Target Compounds

  • Solids content;
  • Liquid content;
  • Calcium/Magnesium;
  • Carbonate content;
  • Alkalinity;
  • Sulfate content;
  • Sulfite content;
  • Combined water;
  • Total water soluble salts;
  • Inerts;
  • pH;
  • Slurry Particle Size Distribuiton.

Performance Tips

Parameter Suggested Method of Analysis Description of Method Suggested Frequency Use of data
Combined Water Moisture Balance Constant mass at 482oF (250oC) Start and finish of each performance test run. Product purity and properties
Carbonate EPRI Method N1 CO2 evolution, Ba(OH)2absorption, 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 J1 EDTA Titration Start and finish of each performance test run. Check for reagent quality - Product Purity.
Sulfate (SO4=) EPRI Method L2 Wet Chemistry Method Start and finish of each performance test run. Product purity and properties
Sulfite (SO3= or CaSO3.1/2H2O) EPRI Method M1 Iodometric titration Start and finish of each performance test run. Product purity and properties
Inerts EPRI Method J1 Acid Dissolution Start and finish of each performance test run. Quality indicator. Important for gypsum systems.
Solids content EPRI Method F1 Gravimetric Start and finish of each performance test run. Check density meter and indicate problems in milling circuit
Particle size distribution Light Scattering Method Malvern 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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