How to distinguish potassium nitrate from its mineral position?

Colorless and transparent prismatic or white particles or crystalline powder. It tastes hot, salty and cold. Slightly hygroscopic, less hygroscopic than sodium nitrate. It gives off oxygen at 400℃. Production method Synthesis method Potassium chloride reacts in 65% nitric acid at 75℃ to generate potassium nitrate, chlorine gas and nitrosyl chloride. When nitrosyl chloride is oxidized by nitric acid, chlorine and nitrogen dioxide escape, and the latter is oxidized by air and absorbed by water to obtain nitric acid. 3k cl+4 HNO 3─→3k NO3+Cl2+NOCl+2H2O NOCl+2 HNO 3 ─→? Cl2+3NO2+H2O 2NO2+H2O+？ O2-→ 2HNO3 solvent extraction method: dissolve potassium chloride in 60% ~ 70% nitric acid at 5 ~ 10℃, and then extract with organic solvent to separate potassium nitrate from hydrochloric acid. Double decomposition potassium nitrate and sodium chloride are obtained by double decomposition reaction of sodium nitrate and potassium chloride. They can be separated by different solubility. This method is widely used in industry. Firstly, sodium nitrate is dissolved in hot water, and potassium chloride is gradually added with stirring according to the ratio of sodium nitrate to potassium chloride = 100: 85. After evaporation and concentration, when the temperature is119 C, sodium chloride crystals are precipitated. Slowly cooling the mother liquor after separation of sodium chloride, potassium nitrate will crystallize out. Filtering, washing and drying to obtain the product. Neutralizing nitric acid with potassium hydroxide or potassium carbonate, and evaporating and crystallizing to prepare potassium nitrate; Or use potassium hydroxide or potassium carbonate solution to absorb the tail gas in nitric acid production and process it into potassium nitrate. It is not necessary to extract potassium nitrate from nitrite mine, and the mud walls of old houses in rural areas can also be used.

Methods: The ore (or wall soil) was crushed, boiled with water, and the aqueous solution was boiled until it was dry, and two layers of crystals appeared, the square crystal was sodium, and the long crystal layer was potassium nitrate.