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Fundamental Study on the Re-utilization of Waste Magnesia-Carbon Bricks as MgO Additive for Iron Ore Sintering
Journal of Sustainable Metallurgy ( IF 2.4 ) Pub Date : 2021-04-23 , DOI: 10.1007/s40831-021-00366-y
Chengzhi Li , Hao Yan , Wei Zhang , Zhengliang Xue

Abstract

Waste magnesia-carbon bricks (MCB) exhibit great potential for being reutilized as MgO additive for iron ore sintering due to their main composition of high activity magnesia and extra carbon content. In this paper, the combustion characteristics of the carbon component of waste MCB were first studied by thermogravimetric, derivative thermogravimetric and differential scanning calorimetry thermal analysis. The influence of waste MCB utilization as MgO additive on the mineralization of sinter raw materials was also systematically investigated. The main conclusions are shown as below: (1) Compared with anthracite, the carbon component of waste MCB has relatively worse flammability and combustibility, and its combustion heat per unit mass is less; (2) As the MgO content of sinter increases from 2.0 to 3.0 wt%, the advantage of using waste MCB, compared with dolomite, as MgO additive in the crystallinity degree of sinter gradually appears; (3) At the MgO content of 3.0 wt%, the sinter using the combination of waste MCB and dolomite as MgO additive has higher content of calcium ferrite, and the distributions of main mineral compositions and pores are more uniform than the sinter totally using dolomite or waste MCB as MgO additive.

Graphical Abstract



中文翻译:

废镁碳砖作为氧化镁铁矿石烧结再利用的基础研究

摘要

废镁碳砖(MCB)的主要成分是高活性氧化镁,而且碳含量较高,因此具有很大的潜力被重新用作铁矿石烧结的MgO添加剂。本文首先通过热重分析,导数热重分析和差示扫描量热法对废MCB中碳组分的燃烧特性进行了研究。还系统地研究了废MCB作为MgO添加剂的利用对烧结矿原料矿化的影响。主要结论如下:(1)垃圾无烟煤的碳成分与无烟煤相比,可燃性和可燃性相对较差,单位质量的燃烧热较小;(2)随着烧结矿中MgO含量从2.0 wt%增加到3.0 wt%,使用废MCB的优势在于,与白云石相比,随着MgO添加剂的出现,结晶度逐渐在烧结矿中出现。(3)在MgO含量为3.0 wt%的情况下,使用废MCB和白云石的组合作为MgO添加剂的烧结矿具有较高的铁素体钙含量,并且主要矿物成分和孔隙的分布比完全使用白云石的烧结矿更为均匀。或废弃MCB作为MgO添加剂。

图形概要

更新日期:2021-04-23
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