When aluminum carbide is on fire, it cannot be extinguished with water
What is aluminum carbide?
Aluminum carbide is an inorganic compound with the molecular formula Al4C3. Yellow or greenish-gray crystal block or powder, hygroscopic. be made of.
The chemical properties of aluminum carbide
Decomposes above 2200℃. Decomposes in cold water to produce aluminum hydroxide.
1. It is a stable substance.
2. It is forbidden to match with water and acids.
3. Avoid contact with air.
4. Decomposition to produce carbonic acid and aluminum hydroxide
What happens when water vapor passes through aluminum carbide?
Hydrolysis is a reaction between a substance and water. As a result, the substance and water decompose to form new compounds. Al3C4 is a salt-like carbide, which is basically a product in which the hydrogen atoms in methane are replaced by metal atoms.
How to prepare aluminum carbide
It is obtained by heating alumina and coke in an electric furnace.
Aluminum carbide Al4C3 is prepared by direct combination of two elements at high temperature.
First prepare a mixture consisting of 1 part heavy smoke black and 6 parts heavy aluminum powder, moisten the mixture with pine essential oil, put a tight layer in a clay crucible, and spread a layer of carbon powder on it. The crucible should be covered with a lid, and all the gaps should be smeared with refractory soil mixed with asbestos fibers. Then, after placing the crucible with the mixture in an oven for pre-drying, the mixture is fired at a temperature not lower than 1200°C for 30 minutes. Higher temperature can make the reaction proceed better. After cooling, the product is treated with dilute hydrochloric acid (or alkaline solution) under cooling to remove excess aluminum. The aluminum carbide obtained as a fine crystalline powder is washed with water to remove aluminum chloride, then the water is quickly washed away with alcohol, and the product is placed in a drying box at a temperature of 80-90°C for drying. The product contains a large amount of aluminum nitride.
Pure aluminum carbide is colorless, but the products made by the above method often have different colors due to impurities in the raw materials.
When the calculated amount of the mixture of aluminum and soot is calcined in hydrogen, a pure product without aluminum nitride can be obtained. This calcination should be carried out at a temperature of 1800 to 1900°C for 2 to 3 hours. The resultant product is ground and calcined again at the above-mentioned temperature.
Pay attention to during operation
Airtight operation, local exhaust. Operators must undergo special training and strictly abide by the operating procedures. It is recommended that operators wear self-priming filter dust masks, chemical safety glasses, chemical protective clothing, and rubber gloves. Avoid generating dust. Avoid contact with acids. Particular attention should be paid to avoid contact with water. When handling, load and unload with care to keep the package intact and prevent spills. Equipped with leakage emergency treatment equipment. Empty containers may be harmful residues.
How to store aluminum carbide
Store in a cool, ventilated warehouse. Keep away from fire and heat sources. The relative humidity is kept below 75%. The package is sealed. It should be stored separately from acids, etc., and should not be mixed. The storage area should be equipped with suitable materials to contain the leakage.
Which fires cannot be extinguished with water
Water is a natural fire extinguishing agent, rich in resources, easy to obtain and store. Water mainly relies on cooling and suffocation to extinguish fires, and it has no harmful effect on the ecological environment during the fire extinguishing process. However, water is not a universal fire extinguishing agent. If a fire occurs with a substance that can react with water, it cannot be extinguished with water, otherwise it will be counterproductive.
Potassium, sodium, calcium, magnesium and other peroxides; light metals (such as metallic sodium, potassium, sodium carbide, potassium carbide, calcium carbide, aluminum carbide, etc.); high-temperature viscous combustible liquid, lighter than water and insoluble in water Flammable liquids; sulfuric acid, nitric acid, hydrochloric acid and other corrosive substances; high-voltage electrical devices, etc.
Substances such as aluminum carbide decompose the water when it meets with water, take the oxygen in the water and combine with it, and at the same time release heat and combustible gas, causing the consequences of intensifying combustion or explosion.
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