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Chloride Chemical Form in Various Types of Fly Ash

机译：各种类型的粉煤灰中的氯化物化学形式

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摘要

Chloride content is a critical problem for the reuse of fly ash as a raw material in cement and the method used by recyclers to reduce the fly ash chloride content depends on the chemical form of the chlorides. However, limited information is available on the quantitative distribution of chlorides and the identity of some chlorides such as Friedel's salt. We examined chloride forms and percentages using X-ray absorption near edge structure and X-ray diffraction analyses, as well as corresponding washing experiments. Approximately 15% of the chlorine in raw fly ash was estimated to be in the form of NaCI, 10% in KCI, 50% in CaCI_2, and the remainder in the form of Friedel's salt. Fly ash collected in a bag filter with the injection of calcium hydroxide for acid gas removal (CaFA) contained 35% chlorine as NaCI, 11% as KCI, 37% as CaCI_2,13% as Friedel's salt, and the remaining 4% as CaCIOH. In fly ash collected in a bag filter with the injection of sodium bicarbonate for acid gas removal (NaFA), approximately 79% of chlorine was in NaCI, 12% was in KCI, and 9% was in Friedel's salt.
机译：氯含量是将粉煤灰作为水泥中的原料再利用的一个关键问题，回收商减少粉煤灰氯化物含量的方法取决于氯化物的化学形式。但是，关于氯化物的定量分布和某些氯​​化物（例如弗里德盐）的身份的信息很少。我们使用边缘结构附近的X射线吸收和X射线衍射分析以及相应的洗涤实验检查了氯化物的形式和百分比。估计粉煤灰中约15％的氯为NaCl形式，KCI为10％，CaCl_2为50％，其余为弗里德尔盐形式。用袋式除尘器收集的粉煤灰中注入氢氧化钙以去除酸性气体（CaFA），其中含35％的氯为NaCl，11％的KCI，37％的CaCl_2、13％的弗里德尔盐，其余4％为CaClOH 。在用袋式除尘器收集的粉煤灰中，注入碳酸氢钠以去除酸性气体（NaFA）时，NaCl中的氯含量约为79％，KCI中的氯含量为12％，Friedel盐中的含量为9％。

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