Síntesis de la sal sulfato de potasio y cromo (III) KCr(SO4)2 para el estudio del proceso de nucleación y cristalización a diferentes condiciones de operación

Abstract

Thanks to the commercial value of crystals in jewelry, it was proposed to study the necessary conditions to crystallize the double salt of potassium sulfate and chromium (III), which is a violet substance of octahedral shape. To understand the process of obtaining nuclei, it was planned to study the initial relationship of the reactants and the presence of Fe, Na in the mother water, in the shape or size of the obtained nuclei. Some of the nuclei obtained were grown in the mother liquors at 5 ° C, 25 ° C and 35 ° C, seeking to know the operating temperature of the crystallization process. After obtaining cores and crystals of different sizes; Between 200μm and 5cm in length, and different geometries, scratch tests were carried out, which allowed to classify them between 2-3 according to the Mohs scale, the solid samples were observed through a 10x, 40x and 100x optical microscope, and the scanning electron microscope (SEM) between 20-200 μm, the Fourier transform infrared transmission spectroscopy (FTIR) was read between 930-800cm-1 with the presence of chromates and sulphates close to 1200cm-1 and in atomic absorption spectroscopy (EAA)) higher chromium and potassium dissolved in solution than those with the presence of iron or sodium chloride are recognized. With this study it was possible to obtain a methodology that allows crystals of potassium sulphate and chromium (III) to be used in jewelry.