磨细循环流化床飞灰对水泥性能的影响

本文用球磨机将循环流化床飞灰磨细，通过测试细度、安定性、需水量比、砂浆流动度、活性指数、胶砂强度等指标，分析粉磨前后飞灰的物理性能变化和对水泥性能的影响。结果表明：随着磨细时间的增加，可有效降低掺入飞灰后水泥的需水量，使流动度提升；粉磨可明显提高飞灰活性，使飞灰自硬性与干缩性能也有所改善；粉磨30 min和50 min的飞灰掺入水泥后均未发现安定性问题；10%飞灰掺量可以使水泥胶砂强度提升，继续增加飞灰掺量则会降低水泥胶砂强度。将循环流化床飞灰磨细可有效改善原状飞灰需水量大、活性低的问题，可作为辅助胶凝材料用于水泥或混凝土中。

Pilot test of MSWI fly ash treatment with cement kiln

A rotary kiln of 100t/d capacity used for MSWI fly ash treatment pilot test was built to explore the process parameters of water washing unit, incineration unit and lavage fluid water treatment. The optimum parameter was that the ratio of liquid to solid should be 3：1 and once concurrent plus twice counterflow washing system. The pollutant in flue gas emission were increased with the addition of fly ash, and the acidic gas and dioxin increased most, but all of them meet the requirements of GB4915-2004. The water requirement of normal consistency and chlorine content of clinker increased when adding fly ash, and the 28d compressive strength, 28d flexural strength and initial setting and final setting time were reduced slightly. Ca and heavy metal was main target to be removed in lavage fluid water treatment. By treating with CO2, Na2CO3, Na2S and FeSO4, Ca and heavy metal could he removed in principle.