Method for complex utilization of phosphogypsum

摘要

The method of total phospholipid elimination consists of the fractionation of phospholipids, followed by the rinsing of them with a sulphuric acid solution of 2-15% concentration and mixing at a temperature of 50-80-C, after which the resulting mixture is separated into a liquid fraction and a residue mainly containing calcium sulphate. The method is characterised by the precipitation from the liquid fraction of metals, mainly lanthanes, phosphates and sulphates of soluble metals in diluted sulphuric acid, and the residue containing mostly calcium sulphates is converted into ammonia water and carbon dioxide into ammonium sulphate and calcium carbonate,after which the filtered and dried calcium sediment in the form of carbonate is dissolved in a solution of nitric acid with a concentration of 15-30% constantly stirring and then produced during the reaction CO2 is reversed and used in the conversion process of the first phase of sediment, and the resulting mixture is separated into a solution of calcium nitrate with dissolved metals and into a fluoride and silicate deposit with embedded metals.