碳热还原作用下烧结机机头灰中钾、钠、锌脱除规律
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张建松(1988—),男,讲师,从事冶金节能与资源优化方面的研究。

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TF046.4; X757

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国家自然科学基金区域创新发展联合基金资助项目(U20A20271);河北省自然科学基金资助项目(E2022209072)


Removal rules of potassium, sodium and zinc from sinterstrand head ash under carbon thermal reduction
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    摘要:

    烧结机机头灰中 Fe 和 K 具有较高的回收价值,两种金属的回收是机头灰资源化的主要目标。本文采用化学分析、X 射线衍射和扫描电镜对机头灰的化学组成、物相组成及微观形貌等理化性质进行研究,通过烧结试验探究焙烧温度、焙烧时间和 n(C)/n(O)(物质的量之比)三因素对机头灰金属元素率和 K、Na、Zn 脱除率的影响规律。结果表明:机头灰中 Fe、K 和 Cl 主要组成元素质量分数为 55.72%,灰中 K、Na、Zn 分别以 KCl、NaCl 和 ZnFe2O4 形式存在;含碳球团的金属元素率和 K、Na、Zn 脱除率随焙烧温度、焙烧时间和 n(C)/n(O) 的增加呈升高趋势;圆块中 Zn 的脱除比 K 容易,K、Na 的脱除相对困难;当焙烧温度为 1 150 ℃,焙烧时间为 10 min,n(C)/n(O) 为 0.9 时,团块的金属元素率和 Zn 脱除率分别为 93.97% 和 98.53%;当焙烧温度为 1 150 ℃,焙烧时间为 60 min,n(C)/n(O) 为 1.2 时,团块中 K、Na 的脱除率分别为 90.14% 和 81.37%。

    Abstract:

    Fe and K in sinterstrand head ash have high recovery value, and the recovery of these two metals is the main goal of head ash resource utilization. Chemical analysis, X-ray diffraction and scanning electron microscopy are used to study the physical and chemical properties of sinterstrand head ash, such as chemical composition, phase composition and microstructure. Roasting experiments are conducted to explore the influence of roasting temperature, roasting time and n(C)/n(O) (ratio of amount of substance) on the metallization rate and K, Na and Zn removal rate of sinterstrand head ash. The results show that the main components of Fe, K and Cl in the sinterstrand head ash account for 55.72% of the total mass, and K, Na and Zn in the ash exist in the form of KCl, NaCl and ZnFe2O4, respectively. The metallization rate and K, Na and Zn removal rates of carbon-containing agglomerates increase with the increase of roasting temperature, roasting time and n(C)/n(O). The removal of Zn in the agglomerates is relatively easy, while the removal of K and Na is relatively difficult. When the roasting temperature is 1 150 ℃, the roasting time is 10 min and the n(C)/n(O) is 0.9, the metallization rate and Zn removal rate of the carbon-containing agglomerates are 93.97% and 98.53%, respectively. When the roasting temperature is 1 150 ℃, the roasting time is 60 min and the n(C)/n(O) is 1.2, the removal rates of K and Na in the agglomerates are 90.14% and 81.37%, respectively.

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张建松,张玉柱,龙 跃,杜培培,任倩倩,刘 超.碳热还原作用下烧结机机头灰中钾、钠、锌脱除规律[J].烧结球团,2024,(6):111-119

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  • 最后修改日期:2024-10-23
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  • 在线发布日期: 2026-08-28
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