Preparation of Potassium Dichromate Crystals from the Chromite Concentrate by Microwave Assisted Leaching
نویسندگان
چکیده
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.
منابع مشابه
A Tandem Scalable Microwave-Assisted Williamson Alkyl Aryl Ether Synthesis under Mild Conditions
An efficient tandem synthesis of alkyl aryl ethers, including valuable building blocks of dialdehyde and dinitro groups under microwave irradiation and solvent free conditions on potassium carbonate as a mild solid base has been developed. A series of alkyl aryl ethers were obtained from alcohols in excellent yields by following the Williamson ether synthesis protocol under practical mild condi...
متن کاملHigh Speed Preparation of GdCaAl3O7:Eu Nano-Phosphors by Microwave-Assisted Combustion Approach
GdCaAl3O7:Eu red nano-phosphors were synthesized by solution combustion using urea as fuel. Fourier-transform infrared, X-ray diffraction, scanning electron microscope, transmission electron microscope and photoluminescence spectrophotometer were used to characterize the obtained samples. XRD patterns revealed that GdCaAl3O7:Eu pure phase was formed by combustion of metal nitrate solution in th...
متن کاملOpen focused microwave-assisted sample preparation for rapid total and mercury species determination in environmental solid samples
This paper describes rapid, simple microwave-assisted leaching/ digestion procedures for total and mercury species determination in sediment samples and biomaterials. An open focused microwave system allowed the sample preparation time to be dramatically reduced to only 24 min when a power of 40-80 W was applied. Quantitative leaching of methylmercury from sediments by HNO(3) solution and compl...
متن کاملNovel Method for the Preparation of Copper Phthalocyanin Blue Nanoparticles in an Electrochemical Cell Irradiated by Microwave (RESEARCH NOTE)
Combined electrochemical and hydrothermal assisted by microwave was used for the preparation of copper phthalocyanin blue (Cu Pc) nanoparticles with sizes ranging from 5 to 35 nm. Phthalic anhydride, urea and ammonium molybdate catalyst were dissolved in aqueous solution of 1 M NH4Cl containing a small amount of lauric acid as capping agent to suppress the flocculation of pigment. Electrodes we...
متن کاملUsing Taguchi Experimental Design to Develop an Optimized Synthesis Procedure of Sodalite Prepared by Microwave and Ultrasonic Assisted Aging
Perlite or pearl stone is a natural glass which has formed by rapid cooling of viscous lava or magma. Perlite is mainly composed of silica, aluminum, potassium and sodium. In this experiment, perlite was used as a low-cost source of Si and Al to synthesis of sodalite zeolite using the alkaline hydrothermal treatment. A statistical Taguchi design of experiments was employed to evaluate the effec...
متن کامل