Can Recycled Fire Extinguisher Powder be used as Fertiliser?

The powder from some fire extinguishers can be used as a fertiliser, but it needs to be refined after it is recycled to make it available to plants in the soil.

REGYP a sister company knows how to do this and accepts bulk recycled extinguisher powder from the major disposal points and then refines it to be reused. See the following link.