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Chlorination roasting-coupled water leaching process for potash recovery from waste mica scrap using dry marble sludge powder and sodium chloride
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-09-05 , DOI: 10.1007/s12613-020-1994-3
Sandeep Kumar Jena , Jogeshwar Sahu , Geetikamayee Padhy , Swagatika Mohanty , Ajit Dash

The present paper reports the effective utilization of marble sludge powder (MSP) for the recovery of potash values from waste mica scrap using chlorination roasting-water leaching method. Characterization studies indicated the presence of dolomite as the major mineral phase in MSP, whereas muscovite and quartz were observed in the mica sample. The acid leaching studies suggest a maximum of 22% potash recovery under conditions: 4 M H2SO4 acid, particle size of ∼100 µm, stirring speed of 600 r/min, leaching temperature of 75°C, and leaching time of 90 min. The chlorination roasting-water leaching process was adopted to achieve the lowest level of 80%–90% potash recovery. The optimum conditions for the recovery of ∼93% potash from mica (∼8.6wt% K2O) requires 900°C roasting temperature, 30 min roasting time, and 1:1:0.75 mass ratio of mica: MSP: NaCl. The roasting temperature and amount of NaCl are found to be the most important factors for the recovery process. The reaction mechanism suggests the formation of different mineral phases, including sylvite (KCl), wollastonite, kyanite, and enstatite, during roasting, which were confirmed by X-ray diffraction (XRD) analyses and scanning electron microscopy (SEM) morphologies. The MSP-blended NaCl additive is more effective for potash recovery compared with the other reported commercial roasting additives.



中文翻译:

使用干燥的大理石污泥粉和氯化钠的氯化焙烧耦合水浸工艺从废云母废料中回收钾

本文报道了氯化污泥-水浸法有效利用大理石污泥粉(MSP)从废云母废料中回收钾盐的价值。表征研究表明,白云石是MSP中主要的矿物相,而在云母样品中观察到白云母和石英。酸浸研究表明,在以下条件下钾的最大回收率为22%:4 MH 2 SO 4酸,粒径约100 µm,搅拌速度为600 r / min,浸出温度为75°C,浸出时间为90分钟。采用氯化焙烧-水浸出工艺以使钾的最低回收率达到80%-90%。从云母中回收约93%钾肥的最佳条件(〜8.6wt%K 2O)需要900°C的烘烤温度,30分钟的烘烤时间,以及云母:MSP:NaCl的质量比为1:1:0.75。发现焙烧温度和NaCl量是回收过程中最重要的因素。反应机理表明在焙烧过程中形成了不同的矿物相,包括钾盐(KCl),硅灰石,蓝晶石和顽辉石,这通过X射线衍射(XRD)分析和扫描电子显微镜(SEM)形态得以证实。与其他报道的商业焙烧添加剂相比,MSP混合的NaCl添加剂对钾的回收更为有效。

更新日期:2020-09-06
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