Determination of the Total Amount of Rare Earth in Zirconium Ore by Oxalate Gravimetric Method
Accurately determining the total amount of rare earth in zircon ore is of great significance for making full use of the value of zircon sand.Because there is a big difference between the elemental composition of zircon ore and that of ordinary rare earth ore,it is necessary to explore the inherent determination method of the total amount of rare earth,so as to obtain better test conditions.At 700 ℃,zirconium ore is molten with sodium peroxide.After extraction and filtering,zirconium in the precipitation is removed with hydrochloric acid,hydrofluoric acid,ammonium fluoride,nitric acid and perchloric acid;silicon element is removed with hydrochloric acid;thorium is removed with six methyltetraamine solution;calcium is removed with excessive ammonia.At the acidity of pH 1.7,rare earth is precipitated with 25 mL oxalic acid solution for 6 hours,and filtered.At 950 ℃,rare earth oxalate sediments are burned into rare earth oxides.After constant weight,the total amount of rare earths in zirconium ore is calculated.The standard recovery rate of this method is 97.8％to 100.4％,the relative standard deviation is less than 2.0％.This test for the determination of the total amount of rare earths in zircon ore by oxalate gravimetric method fully tested the precipitant,pH value,oxalic acid solution dosage and insulation time that affect the determination of the total amount of rare earths.The advantages of this method are that the interference elements are less affected,the detection range is large,the accuracy is good,and the precision is high.
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