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The granules of the high-tower nitro compound fertilizer turn red

2016-04-19View Original

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For the high-tower nitro compound fertilizer, **ammonium phosphate potassium sulfate** is used; after the machine stopped functioning and granulation was halted, the slurry was left to stay and mix for two hours before granulation resumed. The particles turned red, which is likely due to the presence of iron in the raw materials. But why do they turn red only after such a long mixing time?

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