Generally the heating pack of self-heating hot pot is made of sodium carbonate, roasted diatomaceous earth, iron powder, aluminum powder, coke powder, activated carbon, salt, quicklime and so on, and the main reactant is quicklime.

Heating packs before heating are hazardous waste, and the quicklime contained in them has the risk of exothermic.

The heated packets after heating are dry garbage, i.e., other garbage, which refers to domestic waste other than recyclables, hazardous garbage and wet garbage.

Extended information:

Lime is added to water to produce slaked lime, which emits a large amount of heat, and can raise the temperature of 1L of water by 13.78°C . General self-heating hot pot into the amount of water for a bottle of mineral water, water encountered 20 seconds after the temperature can rise over 90 ° C, the process also produces a lot of gas, improper operation is likely to cause an explosion.

Main reaction principle: CaO + H2O = Ca(OH)2 + heat (mainly)

Primary battery electrochemistry: activated charcoal + metal powder + electrolyte - & gt; heat

Angry reaction principle: aluminum powder + strong alkali - ->Sodium meta-aluminate + hydrogen

Self-heating convenient hot pot products of the heating package has the danger of flammable gases released in contact with water, the product is also a dangerous goods in transport. Even, even when you throw it away after eating it, you have to be quite careful. The heating pack has a long heating time, and may continue to heat up for some time after it is eaten and thrown away, which is a potential hazard to scavengers and garbage-sorting workers.

Baidu Encyclopedia - Self-heating rice