37results about How to "Large difference in specific gravity" patented technology

The invention discloses a method for recleaning of vanadium-titanium magnetite concentrates through calcination, alkaline leaching, classification and combination of magnetic separation and gravity concentration. The method comprises the following steps that CaO is added to the vanadium-titanium magnetite concentrates, the mixture is calcined for 20 to 60 minutes at the temperature ranging from 800 DEG C to 1400 DEG C, and therefore a calcined product A is formed; the product A is placed in an alkaline solution with the mass concentration ranging from 5% to 52%, an alkaline leaching reaction is conducted for 0.5 to 5 hours, and filtrate and an alkaline leaching filter cake B are obtained through filtration; water is added to the alkaline leaching filter cake B, so that ore pulp is prepared and fed into a hydrocyclone for classification, and settling sand C and overflow Y are obtained through classification; water is added to the settling sand C, and ore pulp with the mass concentration ranging from 30% to 41% is prepared for magnetic separation and gravity concentration. The method has the advantages that consumption of NaOH or KOH is reduced, the vanadium-titanium magnetite concentrates are efficiently screened, alkali consumption is low, the content of impurities such as Al and Si which enter a blast furnace is reduced, the blast furnace use coefficient is increased, emission of blast furnace slag is reduced, iron manufacture cost is reduced, the problems of the high S content and serious pollution in the smelting process are solved, and meanwhile the comprehensive use rate of titanium resources is improved.