Explain:
Zone refining
Column chromatography .
Explain:
Zone refining
Column chromatography .
This is a method of refining impure metals. The Principle is that impurities are more soluble in the melt than in the solid state of the metal.
A circular mobile heater is fixed at one end of a rod of impure metal. The molten zone moves along with the heater in the forward direction. The pure metal left behind the heater solidifies and impurities pass into the adjacent molten zone. The process is repeated many times in he same direction. At The last end of the rod, impurities are collected which are cut off and removed. This method is very useful for producing semiconductor and other metals of very high purity, e.g., germanium, silicon, boron, gallium and indium.
This method is bease on the fact that different components of a mixture are differently adsorbed on an medium which is moved through the adsorbent. Different components are adsorbed at different levels on (eluted) by using suitable solvents (eluant) In one of these methods, the column of Al2O3 is prepared in the glass tube and the moving medium containing a solution of components is in liquid from.
This method is employed for the purification of elements which are available in minute quantities and the impurities are not very different in chemical properties from the element to be purified.
This is a method of refining impure metals. The Principle is that impurities are more soluble in the melt than in the solid state of the metal.
A circular mobile heater is fixed at one end of a rod of impure metal. The molten zone moves along with the heater in the forward direction. The pure metal left behind the heater solidifies and impurities pass into the adjacent molten zone. The process is repeated many times in he same direction. At The last end of the rod, impurities are collected which are cut off and removed. This method is very useful for producing semiconductor and other metals of very high purity, e.g., germanium, silicon, boron, gallium and indium.
This method is bease on the fact that different components of a mixture are differently adsorbed on an medium which is moved through the adsorbent. Different components are adsorbed at different levels on (eluted) by using suitable solvents (eluant) In one of these methods, the column of Al2O3 is prepared in the glass tube and the moving medium containing a solution of components is in liquid from.
This method is employed for the purification of elements which are available in minute quantities and the impurities are not very different in chemical properties from the element to be purified.
