SOP Production Methods

There are two methods used in the production of SOP. Primary production methods include directly extracting SOP from mineral ores containing both potassium and sulphate. This method is currently rare and may yield by-products, which can contribute additional revenue. Potash Ridge plans to use this method of production at the Blawn Mountain Project.

The most common secondary production method is referred to as the Mannheim Process and involves the reaction of KCI with sulphuric acid. This method for producing SOP accounts for 50% to 60% of the global. The Mannheim Process is the most expensive method of producing SOP due to energy requirements and high cost of purchasing MOP and sulphuric acid. Secondary production is also possible through the reaction of KCI with sulphate salts.

Cash Cost by Production Method

 Process Method and Cost Comparisons

Products Avg
Cost /
Mannheim 60%
  • MOP
  • Sulfuric Acid
  • Energy
  • SOP
  • HCI
MOP and Kieserite 25%
  • MO
  • Kieserite
  • Energy
  • SOP
  • Magnesium Chloride
Salt Lakes 15%
  • Lake Brines
  • Energy
  • SOP
  • Magnesium Chloride
  • NaCI

 The cost is converted from $92 per short ton. Excludes sulphuric acid and bauxite-substitute credits.