Assertion: calcium hydride | /r/AtLocation | amount suilcient
Facets:
value: in the production of titanium hydride
type: OTHER
Source sentences:
text: In the production of titanium hydride, the4 improvement which comprises placing a charge of titanium dioxide pigment and calcium hydride in a reaction zone, placing an absorbing layer of titanium dioxide pigment on top of the charge, evacuating the reduction zone to remove air and moisture, gradually heating the charge to a temperature suoiently high gradually to dissociate the alkaline earth metal hydride into calcium and hydrogen gas to reduce the titanium dioxide in the charge with the calcium thus released to form metallic titanium and calcium oxide, the calcium hydride being present in amount suilcient to yield on dissociation reducing calcium metal in excess of the amount required to effect reduction of the titanium dioxide, evacuating the reaction zone while at a temperature sufficiently high to dissociate the excess calcium hydride to remove hydrogen gas and gaseous products of reaction therefrom and to distill and pass the excess calcium thus released from the underlying charge into the overlying layer of titanium dioxide pigment, introducing hydrogen gas into the heated reaction zone in amount suillcient to convert the reduced titanium to titanium hydride, cooling the resulting charge containing the titaniumhydride and the calcium oxide, separating the overlying layer of absorbing material from the underlying charge, and separately recovering the ,v l 12 titanium hydride by leaching the charge solvent for the calcium oxide.
text: In the production of titanium hydride, the improvement which comprises placinga charge of titanium dioxide pigment and calcium hydride in a reaction zone, placing an absorbing layer of metal oxide on top ofthe charge, gradually heating the charge toa temperature suiiiciently high gradually to dissociate the calcium hydride into calcium'and hydrogen gas to reduce the titanium dioxide in the chargev with the calcium thus released to form metallic titanium and calcium voxide, the calcium hydride being present in amount suiilcient to yield on dissociation-'reducing calcium metal in excess ofthe amount required to effect reduction of the titanium dioxide, evacu-