烧结矿中复合铁酸钙形成影响因素

doi:10.13228/j.boyuan.issn0449-749x.20170520

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摘要以现场烧结矿成分为基础，在实验室条件下，应用干粉压块、焙烧方法，并结合X射线衍射、光学显微镜和扫描电子显微镜来分析烧结温度、二元碱度及Al2O3质量分数对铁酸钙组成和结构的影响。结果表明，烧结矿中铁酸钙组成多为多元系复合形式。烧结温度升高，复合铁酸钙结构由板片状逐渐向针状发展，在1 260 ℃时，针状复合铁酸钙及总铁酸钙质量分数最高，分别达到24.15%、44.21%，烧结矿矿相结构呈明显熔蚀状。二元碱度主要决定了针状复合铁酸钙的生成量，其质量分数随着碱度的升高而增大，高碱度下硅酸盐相增多。Al2O3主要影响板状复合铁酸钙的生成量，适当提高Al2O3的配比有利于形成针状复合铁酸钙。[w(Al2O3)]为3%和4%条件下，复合铁酸钙呈现板片状，强度降低。最佳烧结温度为1 260 ℃，二元碱度为2.0，[w(Al2O3)]为2%。

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	孟凡俭
	孙长余
	李廷乐
	汪琦

关键词 ：关键词：复合铁酸钙, 烧结温度, 二元碱度, Al2O3含量, 矿相结构

Abstract：Based on in-situ sinter composition， the effects of sintering temperature， binary basicity and[w(Al2O3)]on the structure and formation of silico-ferrite of calcium and aluminum were investigated using X-ray diffraction（XRD）， optical microscope and scanning electron microscope， and the samples were prepared under laboratory conditions by adopting the method of dry powder briquetting and roasting. The results show that multi component system is the main existence of calcium ferrite in sinter. The structure of silico-ferrite of calcium and aluminum transforms from plate-like state to acicular state gradually with the increase of temperature. At 1 260 ℃， the content of SFCA-I and total SFCA reach the maximum value， reaching the amount of 24.15% and 44.21% respectively， and the mineral phase structure is obviously corroded. Binary basicity mainly determines the forming amount of SFCA-I， and its content increases with the increase of basicity. The silicate phase increases under the condition of high basicity. The[w(Al2O3)]in the sample mainly affects the accumulation of SFCA. The proper increase of the ratio of[w(Al2O3)]is beneficial to the formation of SFCA-I. With 3% and 4% of[w(Al2O3)，]the silico-ferrite of calcium and aluminum is plate-like state and has low strength under high Al conditions . The optimum sintering temperature， binary basicity and[w(Al2O3)]are 1 260 ℃， 2.0 and 2% respectively.

Key words： Key words: silico-ferrite of calcium and aluminum sintering temperature binary basicity Al2O3 content mineral structure

收稿日期: 2017-10-25 出版日期: 2018-07-24

PACS:

TF046.4

引用本文:

孟凡俭，孙长余，李廷乐，汪琦，. 烧结矿中复合铁酸钙形成影响因素[J]. , 2018, 53(7): 16-23. MENG Fan-jian，，SUN Chang-yu，，LI Ting-le，，WANG Qi，. Formation and influencing factors of silico-ferrite of calcium and aluminum in sinter. Iron and Steel, 2018, 53(7): 16-23.

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