Process for complex processing of bauxite

摘要

Complex processing of bauxite, comprises: grinding the bauxite using a circulating chelate solution; heating the resulting suspension for the extraction of iron to form an iron chelate and a small amount of aluminum chelate; processing the suspension to alumina, and separating into a liquid phase; re-extracting aluminum under precipitation of a precipitate of sodium aluminum hydroxy carbonate which is separated from the solution; and re-extracting iron at a pH of the solution of 12 to precipitate iron hydroxide, which is separated in the form of a commercial iron ore concentrate. Complex processing of bauxite, comprises: grinding the bauxite using a circulating chelate solution; heating the resulting suspension for the extraction of iron to form an iron chelate and a small amount of aluminum chelate; processing the suspension to alumina, and separating into a liquid phase, which is decomposed by double modification of the pH of the solution, performing the neutralization up to a pH of 7-8 using circulating sodium bicarbonate; re-extracting aluminum under precipitation of a precipitate of sodium aluminum hydroxy carbonate which is separated from the solution; and re-extracting iron at a pH of the solution of 12 to precipitate iron hydroxide, which is separated in the form of a commercial iron ore concentrate. The suspension represents enriched bauxite after the extraction of iron in a solid phase. The liquid phase, which is the mother liquor of the chelate, is evaporated, cooled, and carbonized under pressure with carbon dioxide gas for crystallization of the sodium bicarbonate, which is then separated from the chelate solution. The chelate solution and the sodium bicarbonate represent circulation products.