摘要
新型干法水泥生产中,石灰石在分解炉内完成大部分的分解,分解产物进入回转窑,参与形成熟料矿物的固相反应。矿物相的形成速度与氧化钙活性密切相关,活性较高的氧化钙有助于加速矿物形成,降低烧成温度。然而,不同煅烧条件下形成的氧化钙活性具有较大差异,本文利用热导式量热仪测量不同反应条件(煅烧温度、升温速率及石灰石细度)下生成的氧化钙的水化活性。结果表明:新生成态氧化钙的活性随着温度的升高而逐渐增大;急速升温状态下石灰石的分解产物具有更高的化学反应活性;平均粒径24μm石灰石分解生成的新生氧化钙活性最高;在新型干法水泥生产中,如果能保证颗粒充分的分散程度,石灰石粒径的减小将有助于活性的提高。
In NSP cement production process,majority of limestone decomposition is completed in the calciner,and then decomposed product comes into the rotary kiln to participate in solid state reactions of minerals to form clinker.The activity of calcium oxide is closely related to the formation rate of mineral phases.Calcium oxide with a higher activity is helpful to accelerate the mineral formation and decrease the calcination temperature.However,there are larger differences in the activity of these calcium oxides under various calcination conditions.In this paper,the hydration activity of the generated calcium oxides under different reaction conditions（calcination temperature,heating rate and limestone fineness） was measured by a conductive microcalorimeter.Experimental results show that the activity of nascent state calcium oxide increases with calcining temperature increasing;the decomposition products of limestone under a rapid temperature rising have higher chemical activity;the nascent calcium oxide particles generated by the decomposition of limestone with an average diameter of 24 μm have highest activity.In NSP cement production process,if a sufficient dispersity of the particles can be guaranteed,the particle size reduction of limestone is benefit for the activity improvement.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2013年第5期829-832,共4页
Bulletin of the Chinese Ceramic Society
基金
国家重点基础研究发展(973)计划(2009CB623102)项目资助
关键词
石灰石分解
氧化钙活性
反应条件
limestone decomposition
activity of calcium oxide
reaction conditions
