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Chloride extraction for quality improvement of municipal solid waste incinerator ash for the concrete industry

机译:氯化物萃取可改善混凝土行业市政固体废物焚烧炉灰的质量

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Coal ash from power stations has long been used successfully in the cement industry as binders in several Portland formulations. This is not the case for municipal solid waste (MSW) ash as chloride concentrations, ranging from 10 to 200 g kg~(-1) dry weight in the bottom and fly ash, respectively, exceed the maximum allowable concentration in most cement mixtures. To reduce chloride content in MSW bottom ash, a laboratory investigation was carried out based on the exhaustive washing in tap water. The influence of operative parameters such as temperature, granulometric properties and solid/liquid ratio of extraction was evaluated. In addition to optimization of the mentioned operative parameters for full-scale application, the paper gives preliminary indications on mechanistic aspects of the washing operation.
机译:长期以来,来自发电厂的煤灰已在水泥行业中成功用作几种波特兰配方的粘合剂。对于城市固体废物(MSW)灰不是这种情况,因为底部和粉煤灰中的氯化物浓度分别为10至200 g kg〜(-1)干重,超过了大多数水泥混合物中的最大允许浓度。为了减少城市生活垃圾底灰中的氯化物含量,根据自来水的彻底洗涤进行了实验室研究。评估了操作参数的影响,例如温度,粒度性质和萃取的固液比。除了针对全规模应用优化上述操作参数外,本文还对清洗操作的机械方面提供了初步指示。

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