Aluminum pellets for self-heating hot pot heating bag
What is the role of the aluminum pellets in the self-heating hot pot heating pack?
The heating packs of self-cooking hot pot have different formulas, but they are mainly composed of quicklime, activated carbon, iron powder, aluminum particles and other ingredients. When quicklime contacts water, it will release a lot of heat, which is the main source of heat for the heating pack. Activated carbon is an adsorbent, which is conducive to the attachment of various effective ingredients, full contact and chemical reactions. Iron powder and aluminum powder can release a small amount of heat by reacting with oxygen. The heating pack is packaged with high-density non-woven fabric. If there is no flame, it will basically not reach the self-igniting state. Self-heating hot pot uses food self-heating technology, which is also used for self-heating rice. The self-heating hot pot is a sandwich structure, in which the upper lunch box is used to hold food and water, and the lower layer is used to hold the heating pack. First put the ingredients on the upper layer and add water, then take the heating pack out of the sealed plastic bag, put it on the lower layer and add some water. Then quickly put the upper lunch box and close the lid, open the vent, and wait for the lower heating pack to work, and you can eat it in 10-15 minutes.
Generally, the heating package of self-heating hot pot is composed of sodium carbonate, roasted diatomaceous earth, iron powder, aluminum powder, coke powder, activated carbon, salt, quicklime, etc. The main reactant is quicklime. Quicklime is added with water to produce slaked lime, which emits a lot of heat, which can raise the temperature of 1L of water by 13.78℃. Generally, the amount of water in a self-heating hot pot is a bottle of mineral water. It can heat up to more than 90°C in 20 seconds after encountering water, and a large amount of gas will be generated during the process. Improper operation may cause an explosion. Main reaction principle: CaO + H2O = Ca(OH)2 + heat (main) galvanic electrochemistry: activated carbon + metal powder + electrolyte -> thermal generation reaction principle: aluminum powder + strong alkali -> sodium metaaluminate + The hydrogen aluminum powder strengthens the alkali to release combustible gas and promotes the heating effect.
Quicklime (calcium oxide) generates a lot of heat during the process of adding water, so that the rice can be heated. Reaction equation: cao+h2o=(caoh)2. The main component of quicklime is calcium oxide, and the usual preparation method is to calcinate natural rocks whose main component is calcium carbonate at high temperature to decompose to produce carbon dioxide and calcium oxide. use. Quicklime is a common desiccant that uses chemical absorption to remove water vapor. It is also used in steel, pesticides, medicine, desiccants, tanning, and alcohol dehydration. It is especially suitable for local products such as puffed food, mushrooms, fungus, etc., as well as products in industries such as instrumentation, medicine, clothing, electronic telecommunications, leather, and textiles. Traits. Quicklime generally contains overfire lime, and overfire lime slaked slowly. If the lime slurry hardens and then slakes, it will cause swelling and cracking due to the expansion caused by sintering. In order to eliminate the hazard of overfired lime, the lime should be "aged" for about 2 weeks after it has been slaked. The appearance is white (or gray, brown and white), amorphous, and it absorbs water and carbon dioxide in the air. Calcium oxide reacts with water to generate calcium hydroxide and release heat. Soluble in acid and water, insoluble in alcohol. It is an inorganic alkaline corrosive article, and the national emergency code number is 95006. The quicklime reacts chemically with water, and then it is immediately heated to a high temperature of over 100°C.
