Method for recleaning of vanadium-titanium magnetite concentrate by using alkaline leaching, grading and magnetic separation

Abstract

The invention discloses a method for recleaning of a vanadium-titanium magnetite concentrate by using alkaline leaching, grading and magnetic separation. The method comprises the following steps of placing the vanadium-titanium magnetite concentrate into alkali solution with the mass concentration of 5-52%, reacting for 0.5-5 hours in an alkaline leaching mode at 280-370 DEG C, and filtering to obtain filtrate and an alkaline leaching filter cake A; adding water into A to make mine pulp with the mass concentration of 20-25% and feeding into a swirler for grading to obtain overflows and setting sand B; adding water into B to make mine pulp with the mass concentration of 30-36% and performing magnetic separation to obtain final iron ore concentrate with the TFe content range being 63-68% and final titanium concentrate with the TiO2 content range being 35-50%. The method has the advantages that the efficient separation for the vanadium-titanium magnetite concentrate is realized, the alkaline consumption is low, the contents of impurities such as Al and Si, particularly harmful impurities of TiO2 and S, which enter a blast furnace are reduced, the use coefficient of the blast furnace is improved, the discharge of blast furnace slag is reduced, the puddling cost is reduced, and the problems of high S content and severe pollution in the smelting process are solved; the comprehensive use rate of the titanium resources is improved.

Description

technical field

[0001] The invention relates to a beneficiation process of vanadium-titanium magnetite concentrate, in particular to a method for re-selecting vanadium-titanium magnetite concentrate by alkali leaching, classification and magnetic separation. Background technique

[0002] Vanadium-titanium magnetite is a compound ore of multi-metal elements, which is a symbiotic magnetite mainly containing iron, vanadium and titanium. The vanadium-titanium magnetite concentrate is one of the products obtained from vanadium-titanium magnetite through ore dressing, in which vanadium exists in the titanium magnetite in the same quality and isomorphism to replace high-valent iron ions. Titanomagnetite is the main crystal mineral (Fe 3 o 4 ) and guest crystal ore [titanium iron spar 2FeO·TiO 2 , Ilmenite FeO TiO 2 , Al-Mg spinel (Mg, Fe) (Al, Fe) 2 o 4 ] The complex formed. For example, the chemical multi-element analysis results of vanadium-titanium magnetite raw ore and v...

Images