Thermal Instability of Weathering Crust Elution-Deposited Rare Earth Ore
LI Xue-bia · 2015
The adsorption type rare earth ion is adsorbed on the clay minerals aggregate surface consisting of halloysite,illite,kaolinite and montmorillonite,the heating and grinding treatment to the ore is actually the treatment to the clay minerals aggregate. After heating and grinding the raw ore,the total ion phase of the rare earth oxide tends to a decrease,the ion loss rate relative to the total rare earth oxides is increased with the heating temperature increases,the change is a gradual process,and in there is not a conversion of ion phase to the whole phase in the high temperature heating process. The total loss amount of rare earth oxide ion phase tends to a decrease with the increase of the grinding particle size,the average loss rate is 21. 8%,and the decreased extent is larger than that in heating process,the average loss rate is 11. 43% in heating process. The cation exchange capacity is changed in the ore heating and grinding process,it reflects that a change in the thermal instability of the original ore is irreversible.