风化壳淋积型稀土矿矿石热不稳定性研究

Thermal Instability of Weathering Crust Elution-Deposited Rare Earth Ore

离子吸附型稀土吸附在由埃洛石、伊利石、高岭石和蒙脱石等黏土矿物集合体的表面,对该类矿石的加热和研磨实质是对黏土矿物的加热和研磨。对原矿石加热和研磨后,矿石中离子相稀土氧化物总量均呈减少趋势,离子相稀土氧化物总量损失率随加热温度增加而增加,这种变化是一个渐变过程,且中高温加热过程中不存在离子相稀土转换为全相稀土。随研磨粒度的增加,离子相稀土氧化物总量呈减少趋势(平均损失率21.8%),其减少程度比加热过程大(平均损失率11.43%)。加热和研磨都改变矿石中阳离子交换容量,该变化体现了原矿石的一种热不稳定性具有不可逆性。

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.