Purpose. Reuse of waste sludge from alumina production as composite coagulants for purification (post-treatment) of natural and waste water. The resulting reagents can be used to solve environmental problems.
Application area. Environmental protection.
Advantages. Unlike the existing production of iron and aluminum coagulants, this technology allows you to immediately obtain composite iron-aluminum coagulants, moreover, not from high-quality raw materials, but from waste. The use of such coagulants provides the best indicators of turbidity and oxidizability of water with traditional aluminum sulfate.
Description. As a result of acid neutralization of alumina production wastes (red mud) and subsequent decanting and filtering of the resulting solutions, reagents are formed that act as coagulants when displaced by natural and waste waters, forming flakes from iron and aluminum compounds, which are adsorbed and obtained. .