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Open AccessArticle

Preparation of Potassium Dichromate Crystals from the Chromite Concentrate by Microwave Assisted Leaching

by Hua Liu 1,2,3,4, Shenghui Guo 1,2,3,4,*, Jinhui Peng 1,2,3, Duan Yu 1,2,3,4, Libo Zhang 1,2,3,4 and Linqing Dai 1,2,3,*
1
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China
2
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
3
Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming 650093, China
4
National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming 650093, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Shujun Zhang
Crystals 2017, 7(10), 312; https://doi.org/10.3390/cryst7100312
Received: 28 August 2017 / Revised: 10 October 2017 / Accepted: 11 October 2017 / Published: 18 October 2017
(This article belongs to the Section Crystalline Materials)
In the present investigation, the oxidizing roasting process of chromite with sodium carbonate to prepare potassium dichromate crystals was studied in the microwave field with air, by heating the chromite and sodium carbonate. The chromite and sodium carbonate heated separately at 1000 °C in the microwave oven (frequency: 2.45 GHz; power 1.5 kW) in order to study the microwave absorption properties. The dielectric constant and dielectric loss factor of the chromite and sodium carbonate examined. Then, chromite with sodium carbonate taken in (1:2) ratio and heated at 750 °C. Thus obtained samples were characterized using various techniques includes Powder-XRD (XRD), Scanning Electron Microscopy (SEM), and X-ray fluorescence (XRF). The XRD pattern reveals the existence of Fe3O4, Fe2O3, NaAlO2, and Na2CrO4. The iron and aluminum were leached out as Fe2O3 and Al(OH)3 respectively. The resulting sample treated with the KCl to prepare potassium dichromate crystals. Finally, potassium dichromate crystals formed. View Full-Text
Keywords: chromite; microwave; dielectric; ultrasonic extraction; potassium dichromate chromite; microwave; dielectric; ultrasonic extraction; potassium dichromate
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MDPI and ACS Style

Liu, H.; Guo, S.; Peng, J.; Yu, D.; Zhang, L.; Dai, L. Preparation of Potassium Dichromate Crystals from the Chromite Concentrate by Microwave Assisted Leaching. Crystals 2017, 7, 312.

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