Some alkaline oxides, such as calcium oxide (CaO), magnesium oxide (MgO), etc., can react with water. For example, adding an appropriate amount or excess of quicklime to a certain amount of water results in calcium oxide (.CaO), the following chemical reaction will occur:
< p>CaO + H2O = Ca(OH)2This reaction will consume water, and there will be no water left after the reaction is completed. completed.
Outside the forest, some acidic oxides also react with water to form oxygen-containing acids, such as carbon dioxide, sulfur dioxide, etc.
CO2 + H2O =H2CO3< /p>
SO2 + H2O =H2SO3
Carbide is calcium carbide, which is produced by heating quicklime and coke in an electric oven at 2000°C because it is made in an electric oven. oven, it’s not very scientific. The name is calcium carbide.
The preparation method is as follows:
Thereaction equation is: CaO + 3C → CaC2?+ CO , ΔH = +465.7kJ/mol
This This is a strong endothermic reaction, so it must be carried out in an electric furnace at 2100- 2500K. ,
Electric furnace melting method and oxythermal method are generally used in industry. The electric furnace smelting method involves melting coke and calcium oxide (molecular formula CaO) in an electric furnace at approximately 2,200°C to generate calcium. carbide (molecular formula CaC2). Oxygen thermal method: namely: oxygen-enriched thermal method in blast furnaces to melt CaC2 (carbide), extract carbon from limestone and generate gas at high temperature and low pressure.
This furnace and three furnaces use processing technology for CaC2 production to comprehensively utilize waste heat and coal ash in the coal gasification process. Coal ash is melted with ingredients to generate CaC2 and ferrosilicon (during CaC2 purification). ; "The high temperature low pressure gas generator makes gas production natural.
For every ton of CaC2 melted to 80%, about 168 kg of pure carbon is extracted from the limestone, 6,000 to 2,600 m3 of gas are produced and about 4.5 tons of methanol can be produced. Oxygen enrichment not only increases the furnace temperature, but also improves the quality of coal gas CO. Oxygen is particularly dual-purpose. After using the thermal energy of coal, it can be used in coal chemical industry or clean energy production. This process is energy-free and pollution-free CaC2 and gas production.
Closed operation, full ventilation Operators must be specially trained and strictly follow operating procedures./p>
Detailed information:
Calcium carbide, the main component of calcium carbide, is an inorganic compound. White crystals, industrial products are gray-black blocks, and the cross section is purple or gray. Upon encountering water, a violent reaction immediately occurs to generate acetylene and release heat. Calcium carbide is an important basic chemical raw material, mainly used to produce acetylene gas. Also used in organic synthesis, oxy-acetylene welding, etc.
On October 27, 2017, the World Health Organization International CancerThe list of carcinogens published by the research institute is a preliminary reference. The production of calcium carbide is listed as a category 3 carcinogen.
Reference materials:
Baidu Encyclopedia_Calcium Carbide