低温水热法回收霞石正长岩烤浸渣中的铝

IF 2.3 4区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY
Jayashree Samantray, Amit Anand, Barsha Dash, Malay K. Ghosh
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引用次数: 0

摘要

摘要霞石正长岩主要是含钾、铝的铝硅酸盐岩。采用氯化焙烧法回收钾后再进行水浸,考虑霞石正长岩的焙烧浸出渣含铝量较大,可用于提铝工艺。选择硫酸而不是其他酸是因为它能防止钙的浸出。采用2^3全因子设计研究酸浓度、时间和温度的影响。此外,为了提高回收率和防止硅的浸出,首选蒸釜浸出。在酸浸过程中,铁通常与铝一起浸出,通过调整pH值可以有效地去除铁。提纯后得到的浸出液用热水浴蒸发。液体集中缓慢蒸发,直至硫酸铝开始沉淀。然后,将浓缩后的液体在8°C的冷却培养箱中保存过夜。生产的硫酸铝纯度为99.80%。关键词:霞石正长岩;水热法;硫酸铝。其中一位作者(JS)对CSIR在第十二计划期项目中提供奖学金表示感谢。披露声明作者未报告潜在的利益冲突。通过氯化焙烧回收钾,然后对硅酸盐矿物和岩石(如长石、霞石正长岩等)进行水浸得到的残留物富含硅、铝、钙和铁,因此可以以各种方式加以利用。因此,通过增加产品的数量,这些残留物的处理将是钾回收过程的一个附加价值。本文尝试用酸浸法从含铝21.43%的霞石正长岩焙烧浸渣中回收铝。在各种酸中,硫酸浸出对铝的下游处理效果较好。为两个[Citation3]全因子设计选择的三个参数是时间、温度和酸浓度。将设计条件下得到的浸出程度输入Minitab 17,生成回归方程。此外,为了提高回收率和防止硅的浸出,采用模型方程进行蒸釜浸出。由于液中含有铁和铝,因此通过调整pH除去,得到富铝液,进一步处理得到硫酸铝结晶。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Low temperature hydrothermal processing to recover aluminum from nepheline syenite roast-leach residue
ABSTRACTNepheline syenite is primarily an alumino-silicate rock which contains a major amount of potassium and aluminum. After potassium recovery through chloridizing roasting followed by water leaching method, the roast leach residue of nepheline syenite was considered for the aluminum extraction process due to its ample aluminum content. Sulfuric acid is chosen over other acids as it prevents the leaching of calcium. A 2^3 full factorial design was employed to study the effects of acid concentration, time, and temperature. Furthermore, to enhance the recovery and to forbid the leaching of silicon, autoclave leaching was preferred.Iron is generally leached with aluminum in the acid leaching process which could be removed effectively by pH adjustment. The leached liquor obtained after purification is evaporated by using a hot water bath. The liquor concentrated on slow evaporation to a point where aluminum sulfate started precipitating. Then, the concentrated liquor was kept overnight at 8°C in a cooling incubator. Aluminum sulfate was produced with 99.80% purity.KEYWORDS: Nepheline syenitealuminumhydrothermal process, aluminum sulfate AcknowledgmentsThe authors also appreciatively recognize the technical assistance provided by the institute staff for the characterization studies. One of the authors (JS) expresses her gratitude to CSIR for providing the fellowship under XII plan period projects.Disclosure statementNo potential conflict of interest was reported by the author(s).Statement of noveltyThe residues obtained after potassium recovery by chloridizing roasting followed by water leaching of silicate minerals and rocks such as feldspar, nepheline syenite etc. are rich in silicon, aluminum, calcium, and iron due to which these can be utilized in various ways. Hence, processing of these residues would be a value addition to the potassium recovery process by increasing the number of products.In our present work, we have tried to recover aluminum from the roast leach residue of nepheline syenite containing 21.43% aluminum as its oxide employing the acid leaching method. Among various acids, leaching with sulfuric acid was better for downstream processing for aluminum recovery. Three parameters chosen for a two[Citation3] full factorial design were time, temperature, and acid concentration. The leaching extent obtained at the design conditions was fed to Minitab 17, and regression equations were generated. Furthermore, to enhance the recovery and to forbid the leaching of silicon, model equations were utilized for autoclave leaching. As the liquor constitutes iron along with aluminum, hence it was removed by pH adjustment to get aluminum-rich liquor which was further processed to get aluminum sulfate crystals.
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来源期刊
Separation Science and Technology
Separation Science and Technology 工程技术-工程:化工
CiteScore
6.10
自引率
3.60%
发文量
131
审稿时长
5.7 months
期刊介绍: This international journal deals with fundamental and applied aspects of separation processes related to a number of fields. A wide range of topics are covered in the journal including  adsorption, membranes, extraction, distillation, absorption, centrifugation, crystallization, precipitation, reactive separations, hybrid processes, continuous separations, carbon capture,  flocculation and  magnetic separations. The journal focuses on state of the art preparative separations and theoretical contributions to the field of separation science. Applications include environmental, energy, water, and biotechnology. The journal does not publish analytical separation papers unless they contain new fundamental contributions to the field of separation science.
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