【作者】 赵改菊；

【导师】 谢峻林；

【作者基本信息】 武汉理工大学 ， 材料学， 2004， 硕士

【摘要】 随着优质资源的日益稀少，水泥工业逐渐向利用低质燃料的方向发展，但局限于当前的水泥生产工艺水平，能够适应水泥生产的煤种范围比较窄，一般我国水泥工业中的大中型企业多使用优质烟煤，而在我国高硫煤储量丰富。为了拓宽水泥工业用煤的选择范围，本文结合干法水泥生产过程进行了水泥生料对高硫煤的燃烧脱硫理论研究，为高硫煤在干法水泥生产中应用提供理论依据。 本文通过固硫效率的测试、渣样的矿物组成分析及微观结构分析，对水泥生料的固硫行为进行了研究，结果表明，水泥生料本身具有很好的固硫效果，1300℃时固硫效率仍在86％以上。这是由于高温下形成了Ca₅（SiO₄）₂SO₄、3CaO·3Al₂O₃·CaSO₄以及抑制CaSO₄高温分解的熔融包裹物，使固硫产物不再以高温稳定性差的活性CaSO₄的形式存在。添加BaCO₃、SrCO₃后，虽在较低温度下使水泥生料的固硫效率降低，但是随着温度的升高，水泥生料的固硫效果改善。 另外，本文还借助X-射线衍射仪和扫描电镜对高温稳定脱硫产物硫铝酸盐的生成机理及影响因素进行了研究。结果表明，3CaO·3Al₂O₃·CaSO₄具有较好的高温稳定性，且较3CaO·3Al₂O₃·BaSO₄、3CaO·3Al₂O₃·SrSO₄更易形成控制，在1150～1450℃温度范围内都有3CaO·3Al₂O₃·CaSO₄生成，随温度的升高，反应生成增加，1450℃时3CaO·3Al₂O₃·CaSO₄开始分解；Al₂O₃的加入量对3CaO·3Al₂O₃·CaSO₄的生成量没有影响：MgO、Fe₂O₃的存在促进了3CaO·3Al₂O₃·CaSO₄在较低温度下形成，同时也使其分解温度提前；SiO₂、Fe₂O₃的加入提高了CaSO₄耐高温分解能力；BaO的替代对硫铝酸盐的生成不利；而SrO的替代，1400℃、1450℃时，有利于硫铝酸钙生成，随着SrO替代量增大，硫铝酸盐矿物形式为3CaO·3Al₂O₃·SrSO₄或它们与3CaO·3Al₂O₃·CaSO₄共存。更多还原

【Abstract】 With the reduction of high-quality resource day by day, low-quality fuel will gradually be utilized in cement industry. Confined to production technological level of present cement, the range of coal adapted is relatively narrower. The large and medium-sized cement enterprises in our country generally use high-quality bituminous coal. In order to widen selective range of coals in cement kiln, in this thesis, burning desulphurization theoretical research of cement raw material to high sulphur coal is carried on, which offer the foundation theoretical for the high sulphur coal used in New Dry Process kiln craft.The research to desulfurization behavior of the cement raw material is carried by evaluating desulfurization efficiency of cement raw materiaK the analysis of mineral composition and surface morphological on calcine sample. The results show. Within the range of test temperature, cement raw material has better desulfurizaion result. Desulfurizaion efficiency still is above 86% at 1300 C.This should due to the production of 3CaO-3Al2O3-CaSO4 , Ca5(SiO4)2SO4 and melted wrappage which prevent CaSO4 from thermal decomposition. Added BaCO3 and SrCO3, desulfurizaion efficiency of the cement raw material reduce at lower temperature. But with the rising of temperature, desulfurizaion result of raw material added additive become better.In addition, the formulation mechanism and influence factors of 3CaO3Al2O3-MSO4 are studied by XRD and SEM also. The result indicates that 3CaO3Al2O3-CaSO4 can produce within the range of 1150~1450 C, and, also, the response process increases with the rising of temperature gradually. 3CaO3Al2O3-CaSO4 begins to decompose until 1450 C . Amounts of Al2O3 have no effect on the formulation of 3CaO3Al2O3-CaSO4.The existence of MgO and Fe2O3 can promot 3CaO3Al2O3-CaSO4 to form under lower temperature , but the decomposition temperature of 3CaO3Al2O3CaSO4 is advanced too. Thejoining of SiO2 and Fe2O3 has improved the heat-resisting ability of CaSO4. 3CaO3Al2O3-SrSO4 and 3CaO3Al2O3-BaSO4 form at high temperature because the mixing of SrO and BaO .更多还原