METHOD FOR PRODUCING LITHIUM PRODUCTS IN COMPLEX PROCESSING OF SPODUMEN ORES

摘要

1. A method of obtaining lithium products in the integrated processing of spodumene ores, including obtaining monohydrate of lithium hydroxide and roasting a raw mixture with limestone, characterized in that the raw mixture consists of unrefined spodumene ore and limestone at a pier. rel. CaO: SiO2 equal to 2.0-2.2 and soda at mol. rel. Na2O: Al2O3 = 1, the mixture is fired at a temperature of 1200-1250 ° C; leaching of the mixture is carried out with a solution of sodium hydroxide, the resulting solution of aluminates of alkali metals and lithium hydroxide is subjected to decomposition with carbon dioxide with the precipitation of a carbonate variety of double aluminum hydroxide, lithium, followed by obtaining lithium products: lithium hydroxide monohydrate by causticizing the precipitate with lime (milk of lime) and obtaining a solution lithium hydroxide and a precipitate of tricalcium hydroaluminate and / or a mixture of anhydrous lithium aluminates by calcining the carbonate variety of double lithium aluminum hydroxide at a temperature of 600-800 ° C; in the raw mixture of sludge and tricalcium hydroaluminate formed in stage I, lime (limestone) is dosed to a mol. rel. CaO: SiO2 equal to 2.6-3.0, and heat treatment (roasting) of the raw mixture is carried out at a temperature of 600-1400 ° C. ! 2. The method according to claim 1, characterized in that the raw mixture containing sludge and tricalcium hydroaluminate is subjected to heat treatment at 600 ± 50 ° C and joint grinding with lime to obtain slag cement. ! 3. The method according to claim 1, characterized in that the raw mixture containing slurry, tricalcium hydroaluminate and limestone is subjected to roasting at 1300-1400 ° C to obtain Portland cement; ! 4. The method according to claim 1, characterized in that