Potassium nitrate does not explode at room temperature. It's okay to be exposed to the sun as long as you don't increase the heat. Potassium nitrate is not dangerous in general operation! But note that it is a strong oxidant and in principle cannot be mixed with combustibles! Otherwise, explosion may occur (the prescription is reasonable and the process meets the requirements) or deflagration (which is more likely to occur) is more dangerous than potassium nitrate, sodium nitrate and ammonium nitrate (especially when red phosphorus is added, the mixture will be very sensitive to impact). General operation can be assured that careful heating will make potassium nitrate decompose and release oxygen (combustion-supporting) to produce potassium oxide and other non-combustible materials will not explode unless a large number of potassium nitrate is heated together! Or other special circumstances! So what kind of things are prone to explosion?
Generally, chemical reagents with flash point below 25 C are included in flammable chemical reagents. They are mostly volatile liquids, which can be burned when exposed to open fire. The lower the flash point, the more flammable it is. Common flash points below - 4 C are petroleum, chloroethane, condensed ethane, ether, gasoline, carbon dioxide, propylene, benzene, ethyl acetate, methyl acetate. Open fire should never be used in the use of enamel chemical reagents. Heat can not be directly heated by heater, generally not by water bath heating, this kind of chemical reagent should be stored in a cool ventilated place, when placed in the refrigerator, must use explosion-proof refrigerator, once the ether stored in the ordinary refrigerator caused fire, burned the whole laboratory accident, in the use of such chemical reagents in large quantities. In order to maintain good ventilation, explosion-proof appliances must be used, and no open fire should be allowed on site. Flammable reagents can also cause explosion when they are burned intensely. Some solid chemical reagents, such as nitrocellulose, picric acid, trinitrotoluene, trinitrobenzene, azide or overlapping compounds, and horate, are themselves explosive, flammable or decomposed, and exploded when exposed to heat or open fire. These chemical reagents are used. When using these chemical reagents, we should also pay attention to the surrounding fire. There is also a class of solid chemical reagents, which can react violently with water, emit a lot of heat, and can also produce explosions. These chemical reagents include potassium, sodium, lithium, calcium, aluminium hydride, calcium carbide and so on. When using these chemical reagents, it is necessary to avoid their direct contact with water. Some solid chemical reagents can be strongly oxidized by contact with them. For example, yellow phosphorus; some contact with oxidants or heat in the air, shock or friction can cause rapid combustion, or even explosion. For example, phosphorus sulfide, magnesium red phosphorus powder, zinc powder, aluminium powder, rong, wrestling brain and so on, when using these chemical reagents, we must pay attention to the ambient temperature should not be too high (generally not more than 30 degrees, preferably below 20 degrees Celsius) and do not contact with strong oxidants.
Potassium nitrate does not dehydrate in air. It is soluble in water, liquid ammonia and glycerol, but insoluble in absolute ethanol and ether. Oxygen is released from decomposition at 334 and oxygen is released at 400 to form potassium nitrite, and potassium oxide is produced by continuous heating. It is a strong oxidant. Contact with flammable substances and organic substances can cause combustion and explosion, and produce toxic and irritating gases. When heated with carbon or sulphur, it can emit strong light and burn, so although potassium nitrate will not explode in general, we can not take it lightly. We should be cautious in the process of operation and strictly follow the various operating procedures to avoid unnecessary accidents.
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