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本文着重论述不同的灰份吸收率对熟料的显微结构、控制参数和最终产品(OPC)的特性的影响。由于矿物来源不同,试验采用了印度水泥厂中具有代表性的干法生产工艺的生料配比。生料配比Ⅰ由粗晶石灰岩组成,相应的熟料中的阿利特的粒径特别大(75μm)。该生料配比烧制的熟料游离钙平均值在2％以上,反映了易烧性不好。生料Ⅱ的组份是以中粒径石灰岩为基础。对两种生料设计了各自的试验装置。灰份吸收率在5％～10％,并分析了烧成熟料的矿物差别和显微结构差别。生料Ⅰ烧成的熟料中,组份的变化与矿物相变化呈现非线性的趋势。通过熟料的显微镜测定表明,随着灰粉吸收率的增加,阿利特相从40％增加到52％。还观察到,由生料Ⅱ中得到的熟料的组份和显微结构呈周期变化。随着灰粉吸收率从5％增加到10％,阿利特含量从48％降至21％。当工厂生产水平达最佳状态,即灰粉吸收率达5％～6％时,熟料相的形成与期望值相适应。经过粒度规定,发现阿利特晶粒随灰粉水准的提高而改善。对生料Ⅰ进行调整,以使灰粉吸收率达最佳状态,从而使水泥质量提高。生料的变性使熟料达到所需要的C_(35)/C_(25)比率和高早期强度,3天龄期为36.0N/mm~2,28天龄期超过60N/mm~2。
This article focuses on the effect of different ash absorption rates on the clinker microstructure, control parameters, and the characteristics of the final product (OPC). Because of the different sources of minerals, the tests used the raw material ratio of a representative dry process in Indian cement plants. The raw material ratio I is composed of coarse-grained limestone, and the particle size of Alite in the corresponding clinker is particularly large (75 μm). The average free calcium content of the clinker calcined by the raw material ratio is more than 2%, reflecting the poor burnability. The raw material II component is based on medium particle size limestone. Separate test devices were designed for both raw materials. The ash absorption rate is between 5% and 10%, and the mineral difference and microstructure of the burned clinker are analyzed. In the clinker produced from raw material I, the change of the composition and the mineral phase show a nonlinear trend. Microscopic measurements of the clinker showed that the Alite phase increased from 40% to 52% as the ash absorption rate increased. It is also observed that the composition and microstructure of the clinker obtained from the raw material II are periodically changed. As the absorptivity of ash increased from 5% to 10%, the Alit content decreased from 48% to 21%. When the production level of the factory reaches the best state, ie, the ash powder absorption rate reaches 5% to 6%, the formation of the clinker phase is compatible with the expected value. After particle size regulations, it was found that Alite crystallites improved with the level of gray powder. The raw material I is adjusted so that the absorptivity of the ash can be optimized, thereby improving the cement quality. The denaturalization of the raw material resulted in the C_(35)/C_(25) ratio and high early strength required for the clinker, 36.0N/mm~2 at 3 days of age, and more than 60N/mm~2 at 28 days of age.