根据实验室试验结果,1975年在某厂0.2米~3竖炉上进行了用转化天然气还原钒钛磁铁矿球团的扩大试验。国外用天然气转化的还原气在竖炉中还原金属化球团,虽已在七十年代初期有了工业性生产,但他们都对所用球团的成份有极苛刻的要求,如表1所示。0.2米~3竖炉所用的钒钛磁铁矿球团成份如表2所示。 According to the laboratory test results, an expansion test of reducing vanadium-titanium magnetite pellets with converted natural gas was conducted on a shaft of 0.2 to 3 shaft furnaces in a factory in 1975. Although the reduction of metallized pellets by natural gas-converted reducing gas in a shaft furnace has been industrially produced in the early 1970s, they all have very strict requirements on the composition of the pellets used, as shown in Table 1 . Table 2 shows the composition of vanadium-titanium magnetite pellets used in a shaft furnace of 0.2 m ~ 3.