NOVELTY - The filtration apparatus comprises a quartz chamber fixed with stainless steel flange (2) with an O-ring (3) located on one side with an inlet pipe (1) for gas passage, a conical joint that is adapted for a socket fused at the other side and sits vertically on a T-shaped borosil glass tube with a gas outlet through a glass blubber for neutralization of the gas before venting out, a filtration column positioned vertically in the quartz chamber, and a resistive type heating furnace surrounding the filtration column. The filtration column contains a quartz tube.    USE - The filtration apparatus is useful for removing oxides during the purification of cadmium (claimed), which is useful as electronic materials for optoelectronic and nonlinear optic applications such as radiation detectors, electro-optics modulators, solar cells and semiconductor devices.    ADVANTAGE - The filtration apparatus allows easy, economical and effective removal of the oxides form cadmium thus providing ultra pure cadmium with high yield to enhance performance of the semiconductor devices.    DETAILED DESCRIPTION - The filtration apparatus comprises a quartz chamber fixed with stainless steel flange (2) with an O-ring (3) located on one side with an inlet pipe (1) for gas passage, a conical joint that is adapted for a socket fused at the other side and sits vertically on a T-shaped borosil glass tube with a gas outlet through a glass blubber for neutralization of the gas before venting out, a filtration column positioned vertically in the quartz chamber, and a resistive type heating furnace surrounding the filtration column. The filtration column contains a quartz tube that is lined with a high purity carbon foil (7) or graphite sheet for avoiding the quartz and cadmium oxide interaction to eliminate chances of breakage of the quartz tube and has a circular quartz disc (9) with holes, a cone with an orifice fused on the other end of the quartz tube, and a long quartz collection tube, along with quartz wool, placed beneath the quartz tube for collection and easy removal of high purity filtered cadmium ingots at the bottom. The holes are uniformly distributed to secure high yield and purity for allowing easy passage of melted cadmium and for easy removal of left-over oxide deposit at a bottom of the quartz tube. The resistive type heating furnace is controlled by a proportional-integral-derivative temperature controller for reliable control and operation of temperature to maintain the material in liquid form by maintaining a uniform temperature profile from a top to bottom in the filtration column. The circular quartz disc has a diameter of 30 mm, and the holes have diameter of 7 mm.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic vertical sectional view of a filtration apparatus.    Inlet pipe (1)    Flange (2)    O-ring (3)    Carbon foil (7)    Quartz disc. (9)