Who can tell me more about saltpeter?

1. Saltpeter, also called saltpeter, fire saltpeter, tooth saltpeter (also called Mangxiao or Beidi Xuanzhu, flame saltpeter, etc. in ancient books), is a natural mineral whose main component is potassium nitrate. . Potassium nitrate from other sources, as well as other nitrate minerals such as Chilean saltpeter (sodium nitrate) and Norwegian saltpeter (calcium nitrate), are sometimes called saltpeter. But note that Glauber's salt is not a nitrate, but sodium sulfate containing crystal water. Saltpeter is a transparent or white crystal belonging to the orthorhombic crystal system. Its Mohs hardness is close to that of gypsum, its specific gravity is 2.1, and its refractive index is nα=1.332, nβ=1.504, and nγ=1.504. Saltpeter is easily soluble in water. Natural saltpeter is mainly found in dry soil in alkaline soil areas, mineral springs, and cave walls. It is formed by perennial infiltration of water rich in potassium nitrate.

2. Production method of saltpeter:

1. Metathesis cycle method using ammonium nitrate and potassium chloride as raw materials developed by Anhui Chemical Industry Research Institute;

2. Ion exchange method using ammonium nitrate and potassium chloride as raw materials;

3. Metathesis cycle method using sodium nitrate and potassium chloride as raw materials;

4. Purification method using natural potassium nitrate ore as raw material;

5. American ion exchange method;

6. Israeli IMI method;

7. Southwest potash in the United States Company Law;

8. Chilean SQM sodium nitrate conversion method.