| 摘要 |
<p>1,178,281. Purifying metals. E . F . HILL . May, 23, 1967 [May 23, 1966], No.23892/67. Heading C7D. Hydrogen is removed from liquid metal by bringing the metal at a temperature of 260‹ -760‹ C . into contact with the Fe, Ni, Ta or Nb (or alloy thereof) layer of a hydrogen permeable bi-metallic barrier, the other layer, consisting of Pd or Pt or alloy thereof, being in contact with an oxidizing atmosphere. Hydrogen diffuses through the barrier and reacts with the oxidizing atmosphere (e.g. air or oxygen) to produce water, the effect providing a "pumping" action to promote the diffusion. Metals which may be treated are alkali metals used as coolants or heat-transfer agents in nuclear reactor systems and power plants. According to two specified embodiments (a) liquid metal is caused to flow through tubing consisting of Fe &c. coated on its external periphery with Pd &c. which is in contact with an oxidizing atmosphere and (b) an oxidizing atmosphere is conducted through tubing immersed in liquid metal, the Pd &c. layer being present on the interior of the tubing.</p> |
