Article: Minimizing Heavy Metals in Superphosphate Manufacturing

The cadmium and heavy metal content of sedimentary phosphates are of great concern. This has seen industry raw material consumption shift towards igneous phosphates or the blending of phosphate rocks from different sources. While rock blending can successfully reduce the heavy metal content of superphosphates, it needs to be accompanied by careful process adjustments including:

• Environmental considerations
• Rock blending
• Determining the ideal rock blend
• In-line process optimization