What is the difference between metallurgy and smelting?
Metallurgy and smelting are two different concepts. Although both are related to the processing and refining of ores, there are still some differences between them. This article will introduce the definition, history, basic principles, main equipment and application fields of metallurgy and smelting respectively, and compare the similarities and differences between them.
1. Metallurgy and smelting
Metallurgy refers to the process of extracting metals or metal compounds from ores and processing them into metallic materials with desired properties. It includes a series of production links such as metal mining, mineral processing, smelting, casting, processing and heat treatment.
Smelting refers to the process of decarburizing carbon-containing metal materials such as pig iron or crude steel through oxidation reactions, and then melting and refining to obtain steel products with the required chemical composition, metallographic structure and properties. It mainly includes three stages: preparation, smelting and refining.
2.Development
Metallurgy originated in ancient times and has a history of thousands of years. The earliest metal used by humans was copper. With the development of technology, smelting methods for iron, zinc, tin, lead and other metals were gradually discovered. By the Middle Ages, European metallurgical technology developed rapidly, especially the development of the steel industry, which promoted the progress of metallurgy.
The development of smelting technology began with the production of steel. As early as the second millennium BC, people began to use iron to make tools and weapons. In the mid-19th century, European countries began to adopt modern steelmaking methods. With the development of technology, smelting technology continues to advance, and steelmaking methods have also been widely used.
3. Principles of metallurgy and smelting
The basic principles of metallurgy include physical and chemical principles and thermodynamic principles. The principles of physical chemistry mainly study the properties, structure, phase changes and reactions of metals and their compounds; the principles of thermodynamics mainly study the directions and limits of various chemical reactions, as well as their relationship with variables such as temperature and pressure. The application of these principles can help people understand the properties of metals and their compounds and guide various operations in the production process.
The basic principle of smelting is to oxidize the carbon in pig iron or crude steel into carbon dioxide gas through a high-temperature oxidation reaction to achieve the purpose of decarbonization. At high temperatures, impurities in molten iron will also undergo oxidation reactions to generate various oxides and enter the slag. These oxides can be reduced to form sponge-like metals or alloys that can be further processed into the desired steel products.
4. Differences in equipment used
The main metallurgical equipment includes mining equipment, mineral processing equipment, smelting equipment, casting equipment and heat treatment equipment. Among them, smelting equipment mainly includes electric arc furnaces, induction furnaces and reverberatory furnaces; casting equipment mainly includes various casting machines; heat treatment equipment mainly includes various heating furnaces and cooling devices.
The main equipment of refining includes preparation equipment, smelting equipment and refining equipment. Among them, preparation equipment mainly includes loaders, pushers and cranes; smelting equipment mainly includes converters and blast furnaces; refining equipment mainly includes open hearth furnaces, electric arc furnaces and vacuum refining devices.
5. The application fields of the two are different.
The application fields of metallurgy are very wide, including the production and processing of non-ferrous metals, the production and processing of steel, the production and processing of rare metals, the chemical industry and other fields. In the production and processing of steel, metallurgical technology continues to develop, which also puts forward higher requirements for the performance and quality of steel. Steel materials are used in machinery manufacturing, automobile manufacturing, bridge construction and other fields
Mainly used in construction, smelting and other fields, it has a wide range of uses. Product production and processing involves the steel industry, machinery manufacturing, automobile manufacturing and other fields. With the development of technology and the continuous expansion of demand in application fields, smelting technology is also constantly improving and developing, and new varieties of steel are constantly being developed to meet the needs of different fields.
Metallurgy and smelting both extract metals or metal compounds from ores but do not process them into other processing operations. Equipment with the original needs and capabilities of metal fabrics exists in the process. At the same time, their application fields are also different.
To sum up, metallurgy and smelting are both processes of extracting metals or metal compounds from ores and processing them into metallic materials with desired properties.
