Experimental Study on Direct Reduction of Vanadium and Titanium-bearing Sea Sand Ore Pellets in Gas-based Shaft Furnace
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摘要: 为了探索含钒钛海滨砂矿用于气基竖炉还原的可行性,以该砂矿为原料造球,在1 250℃焙烧20 min制得氧化球团的抗压强度为2 099 N/个,还原性指数77.8%,低温还原粉化指数(+3.15 mm)92%,还原膨胀指数7.5%,还原粘结性指数10.4%。氧化球团950℃还原180 min,H2/CO为1.5时球团还原率89.4%,H2/CO为6时球团还原率92%,100%H2时球团还原率96%。氧化球团各项性能指标良好,能够满足气基竖炉工艺的要求。Abstract: To explore the feasibility of direct reduction of vanadium and titanium bearing sea sand ore in gas-based shaft furnace,the oxidized pellets of the ore were obtained by roasting at 1 250 ℃ for 20 min,with compressive strength of 2 099 N,reduction index（RI） of 77.8%,reduction dusting index（RDI） at low temperatures of 92%,reduction swell index（RSI） of 7.5% and reduction cementation index of 10.4%,respectively.The reduction rate of the pellets at 950 ℃ for 180 min is 89.4% with H2/CO=1.5,92% with H2/CO=6 and 96% with pure H2 as the atmosphere,respectively.All the indexes of the pellets are excellent and can satisfy the requirements of the gas-based shaft furnace.
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