Decomposition Mechanism and Calcination Properties of Small-Sized Limestone at Steelmaking Temperature
Decomposition Mechanism and Calcination Properties of Small-Sized Limestone at Steelmaking Temperature
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DOI：
10.3390/pr11041008
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发表时间：
2023-03
期刊：
影响因子：
3.5
通讯作者：
Kaixuan Zhang;Shuhuan Wang;Chenxiao Li;Huakang Sun;Yun Zhang
中科院分区：
文献类型：
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作者：
Kaixuan Zhang;Shuhuan Wang;Chenxiao Li;Huakang Sun;Yun Zhang
在1623 K高温电阻炉中对粒度小于5 mm的石灰石进行快速煅烧，模拟转炉超高温快速煅烧石灰石的条件。研究了小颗粒石灰石在炼钢温度下的分解机理和煅烧特性。研究表明，考虑相边界反应的收缩球或圆柱模型是石灰石动力学数据的最佳代表，其机理函数方程为G（α）= 1 −（1 − α）n，n = 1/2或1/3。粒度为0.18-1.0 mm的石灰石颗粒可以快速煅烧，获得典型的活性石灰微观结构和350 mL以上的高活性，这是石灰石粉喷入转炉炼钢过程中的首选石灰石粒度范围。
Limestone with a particle size of less than 5 mm was rapidly calcined in a high-temperature resistance furnace at 1623 K to simulate the conditions of rapid calcination of limestone at ultra-high temperature in a converter. In this study, the decomposition mechanism and calcination characteristics of small-sized limestone at steelmaking temperature were investigated. The study shows that the shrinking sphere or cylinder models with phase boundary reaction were found to be the best representation of limestone kinetic data, and the mechanism function equation is G(α) = 1 − (1 − α)n, n = 1/2 or 1/3. Limestone particles with a size of 0.18–1.0 mm can be quickly calcined to obtain a typical active lime microstructure and a high activity of more than 350 mL, which is the preferred limestone particle size range in the steelmaking process in which limestone powder is injected into the converter.