ABSTRACT
Hydrochloric acid waste etching solutions are formed as a result of metals pickling. The article suggests perspective directions for processing these wastes into iron oxide nanopowders. The proposed waste recycling technology has the potential to solve certain environmental problems and be economically more efficient than the current ones. High-temperature hydrolysishas been utilized (in the proposed technology). Results of microprobe, microscopic and X-ray analysis of the hydrolysis products show that the material represented by soot particles of less than 100 nm in size is composed of magnetite and hematite; magnetite—hematite ratio varies depending on the conditions of high temperature hydrolysis. The iron oxide nanopowders obtained by sol-gel method have been studied as well.
