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单词 Bessemer process
释义
Bessemer process

Physics
  • A process for converting pig iron from a blast furnace into steel. The molten pig iron is loaded into a refractory-lined tilting furnace (Bessemer converter) at about 1250°C. Air is blown into the furnace from the base and spiegel is added to introduce the correct amount of carbon. Impurities (especially silicon, phosphorus, and manganese) are removed by the converter lining to form a slag. Finally the furnace is tilted so that the molten steel can be poured off. In the modern VLN (very low nitrogen) version of this process, oxygen and steam are blown into the furnace in place of air to minimize the absorption of nitrogen from the air by the steel. The process is named after the British engineer Sir Henry Bessemer (1813–98), who announced it in 1856.


Chemistry
  • A process for converting pig iron from a blast furnace into steel. The molten pig iron is loaded into a refractory-lined tilting furnace (Bessemer converter) at about 1250°C. Air is blown into the furnace from the base and spiegel is added to introduce the correct amount of carbon. Impurities (especially silicon, phosphorus, and manganese) are removed by the converter lining to form a slag. Finally the furnace is tilted so that the molten steel can be poured off. In the modern VLN (very low nitrogen) version of this process, oxygen and steam are blown into the furnace in place of air to minimize the absorption of nitrogen from the air by the steel. The process is named after the British engineer Sir Henry Bessemer (1813–98), who announced it in 1856. See also basic-oxygen process.


Chemical Engineering
  • A process first used for the mass production of steel from pig iron. Named after British engineer Sir Henry Bessemer (1813–98) who in 1856 took a patent on the process; it operates at around 1,250°C in a tilting vessel known as a Bessemer converter. The process involves the removal of impurities from iron by oxidation with air blown in at the base through the molten iron. The product is then converted into steel by the addition of spiegeleisen, which is iron containing a high proportion of manganese and carbon. The oxidation process is exothermic and helps to keep the mass molten in which oxides of silicon and manganese are skimmed off while other oxides are either in the form of gas or solid slag. The furnace is tilted and the molten steel poured off.


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