材料期刊网

高铝铁矿在高炉中用量的逐年增加，带来了高炉炉渣变稠、脱硫困难等一系列问题。生产高MgO烧结矿成为解决高炉炉渣性质的有效途径之一。但是，烧结料中MgO质量分数过高会导致烧结过程中黏结液相量减少，带来烧结矿强度降低的新问题。主要尝试向烧结料中配加少量的低熔点添加剂，以促进烧结过程中铁酸钙生成，拓宽改善烧结矿强度的思路。试验选择了B2O3、CaCl2和Na2SiO3为添加剂，配入高MgO、高Al2O3烧结料进行烧结，通过对试样的XRD衍射分析、观察矿相结构等，研究添加剂对烧结过程的影响。结果表明，加入这3种低熔点添加剂，均能促进铁酸钙形成，但是影响程度不同。当MgO质量分数为4%时，B2O3、CaCl2和Na2SiO3配入量（质量分数）分别为0.094%、0.470%和0.470%，可形成最多的铁酸钙，较少的加入量有利于铁酸钙形态向针状发展。MgO质量分数较高时，液相生成有助于赤铁矿向磁铁矿转变。

Production of rich-containing MgO sinters has become one of the effective ways to solve the problems,such as high viscosity and low desulfurization ability of the slag which was brought by large use of high-alumina iron ores in blast furnace. However,rich-containing MgO raw materials decrease the quantity of binding phase during sintering process to make the strength of sinter worse. This study aims to increase the amount of calcium ferrite(SFCA) by adding additives with low melting point into iron ore fines to improve the quality of sinters. The B2O3,CaCl2 and Na2SiO3 were used as addi-tives to add into high-alumina iron ore fines with rich-containing MgO. The effect of additives on sintering process was in-vestigated according to the results of patterns and optical microstructure of sintered samples from XRD. The results showed that the three kinds of additives have a promotion to form SFCA,but the effects are different. When the mass percent of MgO is 4%,the appropriate amount(mass percent)of B2O3,CaCl2 or Na2SiO is 0.094%,0.470%and 0.470%respectively. It can promote SFCA formation with more amount,and little additive is good for acicular morphology. Anoth-er result indicates that increase of binding phase helps to generate more magnetite under the high content of MgO.