中国水泥工业消纳社会废弃物与发达国家的差距

Gaps between China and developed countries for disposal of social wastes in cement industry

预分解水泥窑消纳各种含有可燃质的废物,既可充分利用其残留的热值,还能彻底干净地处置其燃烧后的残渣,消除二次污染隐患;加之水泥窑适应范围广,可以消纳各种状态的废料,处置能力很大。此法比新建垃圾填埋场或焚烧厂等办法经济得多,收效更快。水泥工业还可以将各种工业废渣用作混合材掺于水泥熟料中一并粉磨成水泥;有的工业废料还可以用作水泥原料以替代天然的石灰石、粘上或铁矿石等。在水泥工业消纳社会废弃物方面,我国与德日美等发达国家,在理念和技术上还有差距:我国看似消纳混合材不少,实为部分超掺滥掺所致;我国原料和石膏的替代率尚有较大提升空间;我国替代燃料的应用十分滞后,须急起直追。

PC kiln systems can digest various wastes which contain combustible matters. It can not only make full use of their surplus calorie, but also can absolutely dispose their residuals after combustion to eliminate the possibility of secondary contamination. Because of the extensive adaptability of cement kiln, which can dispose various wastes in great quantity, it is more economical,convenient and effective to use cement kiln than to build new waste land-filling deposits or new incinerators for waste disposal. Also, cement industry can utilize various industrial slags as admixture to be blended into clinker for cement grinding; and even some of the industrial wastes can be used as substitutions of natural raw materials like limestone, clay or pyrites etc. Gaps still exist between China and developed countries like Germany, Japan and U.S. in both ideology and technology for disposal of social wastes in cement industry. In China, although admixtures are widely used to outward seeming, but indeed, this is resulted by over-intermingled or indiscriminately-intermingled. There are still big rooms for raising the substitution rate for raw materials and gypsum in China,and also, application of alternative fuels is in backward position, with which we must rouse ourselves to catch up.