Method for preparing phosphate compounds

摘要

The invention relates to phosphate compounds obtained according to a method comprising reaction of a source of insoluble phosphate with an organic source, principally of vegetable origin, optionally in the presence of a mineral acid or an organic acid, said organic source having at least 10% of complexing functional groups.;The compounds of the invention are useful for preparing fertilizer.

主权项

1. A method for preparing phosphate compounds comprising the steps of:
a) activating raw organic matter selected from the group consisting of lignite, leonardite, peat, plant composts, lignosulfonates not containing monovalent cations, and algae, wherein the activation is carried out by reacting: (i) from about 70 wt % to about 98 wt % of an organic or inorganic acid, with (ii) from about 2 wt % to about 30 wt % of said raw organic matter, such that at least 10% of complexing functional groups present in the raw organic matter are freed, and b) reacting: (i) from about 30 wt % to about 50 wt % of a source of insoluble phosphate, with (ii) from about 50 wt % to about 70 wt % of the activated raw organic matter obtained in step a).