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微波加熱內配碳酸鈣高碳鉻鐵粉固相脫碳

Solid-phase decarburization of high-carbon ferrochrome powders containing calcium carbonate by microwave heating

  • 摘要: 高碳鉻鐵無渣脫碳法可避免有毒鉻渣的排放,利用微波場可快速加熱粉狀物料的特性,在高碳鉻鐵粉中配加一定比例的碳酸鈣粉,可實現高碳鉻鐵粉快速固相脫碳.實驗結果表明:配加一定比例的碳酸鈣粉,不會影響內配碳酸鈣高碳鉻鐵粉混合物料的微波加熱特性;提高混合物料的脫碳摩爾比、微波加熱溫度和保溫時間,有利于高碳鉻鐵粉的深度脫碳,但相應加劇脫碳鉻鐵粉的氧化程度.合適的固相脫碳條件為:脫碳摩爾比1∶1.0~1∶1.4,微波加熱溫度1100℃,保溫脫碳時間60 min.在上述條件下可使碳質量分數為8.16%的高碳鉻鐵粉脫碳至3.91%~1.71%,脫碳率為52.08%~79.04%.

     

    Abstract: Non-slag decarburization of high-carbon ferrochrome can avoid toxic chromium slag emissions. Solid phase decarburization of high-carbon ferrochrome powder containing a certain proportion of calcium carbonate powder can be achieved using the characteristics of rapid heating powder materials in a microwave field. Experimental results show that adding a certain proportion of calcium carbonate powder does not affect the microwave heating characteristics of high-carbon ferrochrome powder. Deep decarburization of high-carbon ferrochrome powder is realized at a higher decarburization molar ratio of the mixed materials,a higher decarburization temperature,and a longer decarburization time,but the oxidation degree of decarburized ferrochrome powder is also increased accordingly. Under the suitable solid-phase decarburization conditions of the carburization molar ratio of 1:1.0-1:1.4,the microwave heating temperature of 1100℃ and the decarburization time of 60 min,the mass content of carbon in the decarburized materials is 3.91% to 1.71%,and the decarburization rate is 52.08% to 79.04%.

     

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