含碳球团生产珠铁的试验研究

Production of Iron Nuggets Using Carbon-Bearing Pellets at Laboratory Scale

采用以铁精粉、煤粉和石灰石为主要原料制成含碳球团,在1 573、1 623、1 673K下进行了不同加热时间的还原试验研究,并分析计算了炉料带入硫的去向。试验结果表明:在温度为1 673K、12min时,渣铁已经能够很好的分离。所得珠铁中碳、硫的质量分数分别为3.53%和0.17%,珠铁的内部组织结构主要由珠光体和渗碳体组成。渣中以硅酸钙(CaSiO3)和硅酸二钙(Ca2SiO4)为主,含有少量的钙镁橄榄石(CaMgSiO4)和玻璃体。计算得知:炉料带入的硫中24.61%进入渣、61.91%进入铁、13.48%进入空气。

The reduction experiment was carried out, using carbon-bearing pellets which were mainly made of iron concentrate, pulverized coal and limestone, at 1 573 K, 1 623 K, 1 673 K with different heating time. The distribution of sulfur was also calculated. The results show that： at 1673K, 12min, iron nuggets and slag can separate well. The carbon and sulfur content of nuggets is 3.53 % and 0.17 %, the internal organizational structure of nuggets con- sists mainly of pearlite and cementite. The slag mainly contains calcium silicate （CaSiOa） and dicalcium silicate （Ca2 SiO4 ）, and the others are monticellite （CaMgSi04） and vitreous. About 24.61% of sulfur is entering the slag, and 61.91% into the iron, 13.48%get into the air.