冷却介质对白色硅酸盐水泥显色特性的影响

Influence of Cooling Medium on Color Developing Characteristics of White Portland Cement

采用分光测色仪、XRD-Rietveld定量分析等手段研究了不同冷却介质对白色硅酸盐水泥熟料矿物组成和显色特性的影响.结果表明:与风冷熟料相比,水冷熟料的白度值显著提高,金属离子螯合剂EDTA-二钠溶液和二氧化硫脲溶液作为冷却介质相较于水具有更好的增白效果;溶液冷却能通过提高熟料的色品指数L值以及改变其b、a值来显著提高熟料的亨特白度;冷却介质对熟料的矿物组成、非晶相和硅酸三钙晶型都会产生一定的影响,从而影响熟料的显色特性.

The effects of different cooling media on mineral composition and color characteristics of white Portland cement clinker were studied by spectrophotometry and XRD-Rietveld quantitative analysis.The results show that compared with air cooling,the whiteness value of water cooling clinker is significantly increased,and metal ion chelating agent EDTA-disodium solution and sulfur dioxide urea solution cooling have better whitening effect than water cooling.Solution cooling can significantly improve the Hunter whiteness of clinker by increasing the clinker's L value and changing the value of b and a.The cooling medium also has a certain influence on the mineral composition,amorphous phase and calcium silicate crystal type of the clinker,thus affecting the color development characteristics of the clinker.