Effect of Ca-Fe oxides additives on NOx reduction in iron ore sintering

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-12-01 DOI:10.1016/S1006-706X(18)30016-5
Zhi-yuan Yu , Xiao-hui Fan , Min Gan , Xu-ling Chen
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引用次数: 15

Abstract

As the emission control regulations get stricter, the NOx reduction in the sintering process becomes an important environmental concern owing to its role in the formation of photochemical smog and acid rain. The NOx emissions from the sintering machine account for 48% of total amount from the iron and steel industry. Thus, it is essential to reduce NOx emissions from the sintering machine, for the achievement of clean production of sinter. Ca-Fe oxides, serving as the main binding phase in the sinter, are therefore used as additives into the sintering mixture to reduce NOx emissions. The results show that the NOx reduction ratio achieves 27.76% with 8% Ca-Fe oxides additives since the Ca-Fe oxides can advance the ignition and inhibit the nitrogen oxidation compared with the conventional condition. Meanwhile, the existence of Ca-Fe oxides was beneficial to the sinter quality since they were typical low melting point compounds. The optimal mass fraction of Ca-Fe oxides additives should be less than 8% since the permeability of sintering bed was significantly decreased with a further increase of the Ca-Fe oxides fines, inhibiting the mineralization reaction of sintering mixture. Additionally, the appropriate particle size can be obtained when mixing an equal amount of Ca-Fe oxides additives of −0. 5 mm and 0. 5−3. 0 mm in size.

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钙铁氧化物添加剂对铁矿石烧结过程中NOx还原的影响
随着排放控制法规的日益严格,烧结过程中氮氧化物的减少因其在光化学烟雾和酸雨的形成中起着重要的作用而成为一个重要的环境问题。烧结机的氮氧化物排放量占钢铁工业总排放量的48%。因此,减少烧结机的NOx排放,实现烧结矿的清洁生产至关重要。钙铁氧化物作为烧结矿中的主要结合相,因此被用作烧结混合物的添加剂,以减少NOx的排放。结果表明,与常规条件相比,添加8%的Ca-Fe氧化物可以促进着火,抑制氮氧化,因此NOx的还原率达到27.76%。同时,钙铁氧化物是典型的低熔点化合物,有利于烧结矿质量的提高。Ca-Fe氧化物的最佳质量分数应小于8%,因为随着Ca-Fe氧化物细粒的进一步增加,烧结床的渗透率显著降低,抑制了烧结混合物的矿化反应。此外,当混合等量的- 0 Ca-Fe氧化物添加剂时,可以获得合适的粒径。5毫米和0。5−3。尺寸为0毫米。
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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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