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A novel application of waste cement clinker dust in the extraction of potash from mica scraps
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2020-09-11 , DOI: 10.1016/j.resconrec.2020.105161
Sandeep K. Jena , Nilima Dash , Swagat S. Rath

The prospect of using cement clinker dust (CKD) as an additive in recovering potash values from an Indian mica scrap sample, containing 7.64% potash, is explored. It is found that the clinker dust, mostly treated as solid waste in the cement industry, can act as the calcium source in the chloridizing roasting of mica. The experiments have been carried out as per the central composite design. Factors such as the dosage of mica, clinker dust, NaCl along with roasting parameters such as temperature and time have been optimized. At a roasting temperature of 950 °C, time of 40 min, and the dosages of clinker dust and NaCl to the tune of 70–75% of the mica weight, the process is found to recover 99% of the potash values. With lowered process conditions such as a temperature of 900 °C and time of 10 min, it is possible to recover 89% of the potash values with clinker dust and NaCl each at a dosage of 50% of the weight of mica. Characterization studies like X-ray diffraction and field-emission scanning electron microscopy coupled with energy dispersive spectroscopy have been carried out to identify the different phases of the feed and processed products, and thereby propose the reaction sequence.



中文翻译:

废水泥熟料粉尘在云母废料中提取钾的新应用

探索了使用水泥熟料粉尘(CKD)作为添加剂从含7.64%钾盐的印度云母废料样品中回收钾盐价值的前景。已经发现,熟料粉尘在水泥工业中通常被视为固体废物,可以作为云母氯化焙烧中的钙源。实验已按照中央复合设计进行。云母,熟料粉尘,NaCl的用量以及焙烧参数(例如温度和时间)已得到优化。在950°C的焙烧温度,40分钟的时间以及熟料粉尘和NaCl的用量达到云母重量的70–75%时,发现该工艺可回收99%的钾肥值。在较低的工艺条件(例如900°C的温度和10分钟的时间)下,用熟料粉尘和NaCl分别以云母重量的50%的剂量回收钾盐含量的89%。已经进行了表征研究,如X射线衍射和场发射扫描电子显微镜以及能量色散光谱学,以鉴定进料和加工产物的不同相,从而提出反应顺序。

更新日期:2020-09-12
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