It is an important way to realize low carbon in China’s iron and steel industry by hydrogen-rich blast furnace smelting process.Sinter is the main blast furnace burden,and its reduction characteristics have a signifi...It is an important way to realize low carbon in China’s iron and steel industry by hydrogen-rich blast furnace smelting process.Sinter is the main blast furnace burden,and its reduction characteristics have a significant influence on ironmaking.The reduction behaviors,including reduction index(RI)and low-temperature reduction disintegration index(RDI),and the reduction mechanism of sinter in hydrogen-rich blast furnace were investigated.The results show that RI increased from 82.85 to 95.53 wt.%with an increase in H_(2)content from 0 to 30 vol.%,and the main phase of the reduction product was metallic iron.In the research of RDI,when the H_(2)content was increased from 0 to 20 vol.%,RDI+3.15 increased from 69.61 to 75.38 wt.%,and the main reaction was the reduction of hematite to magnetite.At 600-950℃,the reduction of sinter in CO and hydrogen-rich atmospheres(H_(2):CO=2)was both controlled by the first-order reaction model,and the apparent activation energy was 33.64 and 44.57 kJ/mol,respectively.展开更多
Hydrogen-enrich iron making process is certainly to be an effective method to reduce greenhouse gases emission.However,the effect of hydrogen addition on the low temperature metallurgical property of sinter is still u...Hydrogen-enrich iron making process is certainly to be an effective method to reduce greenhouse gases emission.However,the effect of hydrogen addition on the low temperature metallurgical property of sinter is still unclear.A detailed investigation was performed on the above topic.The results are as follows.When CO is partially replaced by H2,the RDI〈3.15（RDI〈2.8） of sinter decreases with the increase of the H2 content;when the content of H2 increases,the CO,CO2 and N2 decrease proportionally,in this case,RDI〈3.15（RDI〈2.8） of sinter increases with the increase of H2 content;the value of RDI〈3.15（RDI〈2.8） basically depends on the reduction index（Ri）.The experimental data of RDI〈2.8 based on Japanese industrial standard（JIS） are a little higher than the data of RDI〈3.15 based on Chinese industrial standard（CIS） in the same condition.In addition,for part of CO is replaced by H2：RDI〈2.8=3.38394＋1.1585 RDI〈3.15;for other gases,except H2,are decreased proportionally：RDI〈2.8=17.39678＋0.42922 RDI〈3.15展开更多
基金supported by National Natural Science Foundation of China(Nos.52274343 and 52474370)the China Baowu Low Carbon Metallurgy Innovation Foundation(BWLCF202102).
文摘It is an important way to realize low carbon in China’s iron and steel industry by hydrogen-rich blast furnace smelting process.Sinter is the main blast furnace burden,and its reduction characteristics have a significant influence on ironmaking.The reduction behaviors,including reduction index(RI)and low-temperature reduction disintegration index(RDI),and the reduction mechanism of sinter in hydrogen-rich blast furnace were investigated.The results show that RI increased from 82.85 to 95.53 wt.%with an increase in H_(2)content from 0 to 30 vol.%,and the main phase of the reduction product was metallic iron.In the research of RDI,when the H_(2)content was increased from 0 to 20 vol.%,RDI+3.15 increased from 69.61 to 75.38 wt.%,and the main reaction was the reduction of hematite to magnetite.At 600-950℃,the reduction of sinter in CO and hydrogen-rich atmospheres(H_(2):CO=2)was both controlled by the first-order reaction model,and the apparent activation energy was 33.64 and 44.57 kJ/mol,respectively.
文摘Hydrogen-enrich iron making process is certainly to be an effective method to reduce greenhouse gases emission.However,the effect of hydrogen addition on the low temperature metallurgical property of sinter is still unclear.A detailed investigation was performed on the above topic.The results are as follows.When CO is partially replaced by H2,the RDI〈3.15（RDI〈2.8） of sinter decreases with the increase of the H2 content;when the content of H2 increases,the CO,CO2 and N2 decrease proportionally,in this case,RDI〈3.15（RDI〈2.8） of sinter increases with the increase of H2 content;the value of RDI〈3.15（RDI〈2.8） basically depends on the reduction index（Ri）.The experimental data of RDI〈2.8 based on Japanese industrial standard（JIS） are a little higher than the data of RDI〈3.15 based on Chinese industrial standard（CIS） in the same condition.In addition,for part of CO is replaced by H2：RDI〈2.8=3.38394＋1.1585 RDI〈3.15;for other gases,except H2,are decreased proportionally：RDI〈2.8=17.39678＋0.42922 RDI〈3.15
