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区域精炼原理(区域提炼)

时间:2018-11-04 浏览次数:724

Zone Refiner Theory区域精炼原理(区域提炼)

During zone refining or zone melting short molten zones move slowly through an elongated sample of crystalline material.   A molten zone traversing a solid sample has two liquid-solid interfaces; a melting interface and a freezing interface. At the melting interface the sample is merely melted and mixed with the contents of the molten zone. At the freezing interface the crystals tend to be higher in purity than the liquid phase.

在区域精炼或区域熔化期间,短的熔融区域缓慢地移动通过细长的结晶材料样品。 穿过固体样品的熔融区具有两个液 - 固界面; 熔化界面和冷冻界面。 在熔化界面处,样品仅熔化并与熔融区的内容物混合。 在冷冻界面处,晶体的纯度往往高于液相。

zone movement

Extraordinarily high purification of chemicals can be obtained by repeatedly passing the molten zone or zones through the sample. The impurities are concentrated at the end of the sample, generally in the direction of the movement of the molten zone.

通过使熔融区域重复通过样品,可以获得非常高的化学品净化。 杂质在样品的末端浓缩,通常在熔融区的移动方向上。

Mathematically this can be expressed as a constant, K, known as the distribution coefficient.  If the concentration of impurity in the solid (crystalline) phase is Cs and the concentration of impurity in the liquid phase is Cl then K is Cs/Cl.  If K is less than 1 (the usual case), the impurities will follow the movement of the liquid zone; if K is greater than 1, the impurities will travel in the opposing direction.

在数学上,这可以表示为常数K,称为分布系数。 如果固体(结晶)相中的杂质浓度是Cs并且液相中的杂质浓度是Cl,则K是Cs / Cl。 如果K小于1(通常情况下),杂质将跟随液体区的运动; 如果K大于1,则杂质将沿相反方向行进。

 

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