| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to methods of purifying potassium nitrate to obtain a highly pure product which can be used in modern science and engineering fields (fibre optics, optical glass manufacturing, monocrystallites etc). Aqueous potassium nitrate solution is purified by treating, while stirring, a starting aluminium nitrate product taken in an amount of 1.5-2.5% of the mass of potassium nitrate, and diluted aqueous potassium hydroxide solution to pH 7.5-8.2, followed by filtering the precipitate, evaporating the purified potassium nitrate solution to density of not more than 1.3-5 g/cm, cooling to 20-25°C, separating the precipitated crystallites, preferably by centrifuging at 500-2000 rpm and drying at 100-110°C.EFFECT: obtaining potassium nitrate with higher purity.4 cl, 3 ex |
