PROCESS FOR PREPARING CALCIUM NITRATE AND PHOSPHORIC ACID SOLUTIONS FREE FROM SOLID PARTICLES IN SUSPENSION

摘要

A process for preparing solutions consisting mainly of calcium nitrate and phosphoric acid, substantially free of solid particles in suspension, characterized in that: by attacking the mineral phosphate with nitric acid, a dispersion is prepared containing mainly calcium nitrate and phosphoric acid and in which the silica that comes from the silicate solution is present in an amount between 12 and 27 grams per kg of mineral phosphate; A flocculating agent of a known type is added to the dispersion in an amount of between 10 and 150 mg per kg of mineral phosphate, thereby obtaining the formation of an upper layer consisting of the thickened solid and a lower layer consisting of the solution. substantially free of solid particles in suspension; and the clarified solution is separated from the thickened solid. (Machine-translation by Google Translate, not legally binding)