Obtaining of magnetite for the magnetic fluids using iron-chromium galvanic sludge

Abstract

Magnetic fluid is a promising material for wide application, which is constrained by the extremely high cost, as the magnetite — its basis is synthesized from the reactive raw materials. Search of cheaper sources for magnetite will extend its use for cleaning water and soil from oil petroleum product, separation of materials by density, reduction of vibratory activity of machines and a number of other areas. Studies have shown that the basis for the production of magnetite can be galvanostat resulting from electrocoagulation cleaning of wash wastewater after common operations of chrome plating. The simultaneous presence of ions of chromium and iron provides the flow of redox processes at temperature influence leading to the emergency of ions of three — and bivalent iron, necessary for the synthesis of magnetite (Fe2O3 · FeO). The results of X-ray and magnetometry studies of galvanic sludge decrepitation up to the 1000°C is shown in this article. It is shown that decrepitation of galvanic at the temperature 400°C and more leads to rise of iron containing in galvanic sludge and as a result grain formation of magnetic oxide of iron. The process is accompanied by the growth of magnetirability saturation of samples. The received material can be used for synthesis of magnetic fluid. Refs 6. Figs 4. Tables 1.