PROCESS FOR PRODUCING AN ORGANO-MINERAL FERTILIZER

摘要

The invention relates to a process for producing an organo-mineral fertilizer from vinasse, filter cake and generally boiler ashes, as byproducts of the sugar and/or alcohol manufacture and, optionally, complemented with fertilizer sources composed of macronutrients (primary and secondary) and micronutrients. The process comprises, in a preferred form of the invention, the steps of : concentrating the vinasse until about 65% of solids (p/p); mixing and dissolving the fertilizer elements in the concentrated vinasse; mixing and drying the filter cake and ashes in a hot gas stream obtained by burning bagasse or fine straw; impregnating this dry mixture with the concentrated vinasse mixture and the added fertilizer agents; and, finally, drying and granulating the final formulated mixture. The end product is a granular solid containing N, P, K, Ca, S, Mg and micronutrients, according to the previously programmed formulation. In the other form of the invention, the same process is effected, but without adding the fertilizer elements.