Abstract

The weathering behavior of highly fluxed and reduced iron ore pellet (DRI-Direct Reduced Iron) having 4, 6, and 8 basicity and 65–98% R (R-reduction) are given in this paper. The primary objective has been to solve weathering issues related to DRI and fresh lime used in the secondary steelmaking process. Experimental studies indicated that the addition of lime during pellet making and its subsequent reduction in coal bed yielded weather-resistant fluxed DRI with lime present in combined state. Such fluxed DRI exposed to 10 days open air (85% humidity) resulted in only 2 wt% moisture adsorption. The 30 days of air exposure caused 6 wt% moisture adsorption within acceptable limits for industrial acceptance. This low moisture adsorption by fluxed DRI was perhaps due to the presence of lime in combined form.

Graphical Abstract

中文翻译：

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新开发的高通量DRI的耐候性

摘要

本文给出了具有4、6、8的碱度和65-98％R（R还原）的高通量和还原铁矿石球团（DRI-直接还原铁）的风化行为。主要目标是解决与二次炼钢过程中使用的DRI和新鲜石灰有关的风化问题。实验研究表明，在制粒过程中加入石灰及其在煤层中的减少会产生耐候通量DRI，且石灰以混合状态存在。暴露于空气中10天（85％湿度）的这种DRI助焊剂仅吸收2 wt％的水分。暴露在空气中30天导致6 wt％的水分吸附在工业可接受的可接受限度内。助熔DRI吸收的水分很低，可能是由于存在混合形式的石灰。

图形概要