Analysis of the characteristics of calcium carbide

Calcium carbide is commonly known as calcium carbide. Industrial products are dark gray, brown or black gray in color, while those with higher levels of calcium carbide are blue purple in color. Its original cross-section has glossiness and absorbs moisture in gas, appearing dark gray or gray white. It can conduct heat, and the higher the purity, the better the heat conductivity. It can absorb moisture in gas. Add water to convert into acetylene and calcium hydroxide. Transformed into calcium cyanamide by reacting with nitrogen gas. Calcium carbide is one of the basic raw materials in the chemical synthesis industry. It is a key raw material for acetylene chemical plants. Acetylene produced from calcium carbide is widely used in metal welding and cutting.

Although calcium carbide has only appeared in high school curriculum, it is particularly favored by test takers due to its diverse structure and properties, making it a hot topic and one of the famous star substances in chemistry test setting for the college entrance examination in recent years. Its perspective on test setting is both novel and exhibits some regularity or characteristics. The solid state of calcium carbide reacts with water to convert into acetylene and calcium hydroxide, which is the only chemical reaction learned in middle school to produce acetylene through solid state and water chemical reactions.

In addition to producing a bright flame, acetylene is also accompanied by a large amount of thick smoke. Calcium hydroxide is a slightly soluble substance that easily forms a milky white suspension. The solid state chemical reaction of calcium carbonate with water is a very strong chemical reaction, and the converted Ca (OH) 2 is prone to forming a paste, which can block the plastic plate holes. Therefore, this chemical reaction cannot be carried out in a starter generator, but can be carried out in a simple device without a pore plate.

Calcium carbide, the main component of calcium carbide, is an inorganic compound with white crystals. Industrial products are black gray blocks with a cross-section of blue purple or dark gray. Upon encountering water, a violent chemical reaction occurs immediately, converting it into acetylene and releasing heat. Calcium carbide is a key basic chemical raw material, mainly used for producing acetylene gas. Also used in chemical synthesis, oxyacetylene welding, etc.

Store in a cool, dry, and well ventilated warehouse. Eliminate sparks and heat sources. The air humidity is maintained below 75%. The packaging must be sealed and not damp. It should be stored separately from acids, alcohols, etc., and should not be mixed for storage. The storage area should be equipped with suitable materials to contain leaked materials.

In industry, the heating furnace smelting method and oxygen heating method are generally used. The heating furnace smelting method is to place coke and calcium oxide (molecular formula CaO) in a heating furnace at around 2200 ℃ for smelting, and convert them into calcium carbide (molecular formula CaC2). Oxygen heating method: that is, the blast furnace oxygen rich oxygen heating method is used to smelt CaC2 (calcium carbide), obtain carbon from limestone, and produce high-temperature bottom pressure gas in the furnace.