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> Even though all minerals contain impurities, NPK fertilizer is processed to reduce them to acceptable levels for agriculture Source? What process exactly?
by chabska 2y ago
> Even though all minerals contain impurities, NPK fertilizer is processed to reduce them to acceptable levels for agriculture
Source? What process exactly?
- hello_computer 2y agoSo many types of mining have loads of fluoride or heavy metals to discard. Since we’re dealing with minerals, in some cases visual inspection & sorting is sufficient. In other cases where high purity is required, may need to dissolve/melt them and process a series of precipitates & evaporates (i.e. expensive). Here’s a fertilizer example: https://pubmed.ncbi.nlm.nih.gov/21681395/ https://pubmed.ncbi.nlm.nih.gov/21681395/ You can find similar articles just about everywhere there’s an NPK plant. I know gypsum, aluminum, uranium are faced with similar obstacles. Google if you want details. (I do control systems if that helps.)