Preparing granular calcareous soil conditioner, useful for e.g. increasing soil pH and nutrient availability, by granulating dolomite with strong acid and ammonium nitrate solution

摘要

Preparation of granular mixed calcareous soil conditioner (A) comprises granulating a dolomite-based material (B) by blending it with: (i) an aqueous solution of phosphoric, sulfuric or nitric acid; and (ii) liquid concentrate of ammonium nitrate (AN). (B) contains, by weight, 5-15% magnesium and 30-45% calcium, as oxides. Independent claims are also included for the following: (1) (A) produced this way; and (2) (A) having diameter 2.5-4 mm, good disintegration in water and hardness over 1 kg.