Addendum to the technology for extraction of scandium from matte of the Kadamzhai Antimony Plant

The article discusses methods for extracting rare earth elements from the waste (matte) of the Kadamzhai antimony plant. For this purpose, the quantitative determination of scandium was used by photocolorimetry of solutions of its complexes, which, compared to the known ones, will allow analysis within 25-30 minutes with sufficient accuracy and makes it possible to determine scandium in technogenic waste without preliminary separation of interfering impurities. To do this, add ascorbic acid to the solution, adjust the pH to 1-2, then add xylenol orange and colorimeter using the usual methods Photocolorimetry is not affected by alkaline earth elements (Ca, Ba, Sr, Mg), rare earth elements (La, Pr, Nd, Sm and others), as well as yttrium, zinc, cadmium, manganese, iron. The harmful effects of Fe are eliminated by the addition of ascorbic acid.