An Experimental Study on the Preparation of Battery Grade Iron Phosphate from the Recovery of Phosphorus Iron Slag Using Sulfuric Acid Ammonia Water System
A sulfuric acid ammonia water system was used to investigate the effects of n(H2SO4)∶n(Fe),reaction temperature and reaction time on the recovery rate of iron and phosphorus during the leaching reaction stage.And the effects of ammonia addition time and system pH on the iron phosphate index during the synthesis reaction stage.The experimental results showed that iron and phosphorus were first leached under the conditions of n(H2SO4)∶n(Fe)=1.5,reaction temperature of 80℃and reaction time of 2 hours.Subsequently,by adding10%ammonia water continuously for 50 minutes to form basic iron phosphate at pH 1.5,the synthesis reaction was conducted.This method yields battery-grade iron phosphate with superior physical,chemical,and electrical performance metrics.
Sulfuric acid ammonia water systemPhosphorus iron slagLeaching reactionSynthesis reactionIron phosphate
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