Alkali metal faujasite having a silica to alumina ratio in excess of about 3 is rate earth exchanged in an acid media at a pH of about 3.0 to 3.5, calcined, and washed to reduce the alkali metal oxide content thereof to a low level. The exchanged faujasite contains 6 to 14 percent by weight rare earth oxide and a concentration of hydrogen ions which imparts the desired catalytic activity. The present rare earth-hydrogen faujasite finds utility as a hydrocarbon conversion catalyst, and particular...

A phosphor is prepared by conversion of a rare earth oxide, the rare earth element appearing in its normal trivalent state in the oxide but in its bivalent state in the phosphor. The conversion is achieved by initially mixing, in their dry solid states, the oxide with a reducing agent and then heating the mixture in a vacuum. The composition of the agent is such that it is oxidized and forms part of the phosphor. An appropriate reducing agent, by way of example, is silicon monoxide, in which cas...

A process and an apparatus for recovering a noble gas, which can recover a noble gas exhausted from a noble gas employing system efficiently and also can supply the noble gas of a predetermined purity to the noble gas employing system and which can reduce consumption of the noble gas. In the process and apparatus for recovering a noble gas, when a noble gas contained in an exhaust gas exhausted from a noble gas employing system operated under reduced pressure is recovered, switching between intr...

A process is described to reclaim a variety of rare-earth phosphors that have been contaminated by combination with other phosphors used in the manufacture of color television cathode ray tubes. The process also removes the organic binder used in such manufacture so that a reclaimed phosphor has physical and behavior characteristics substantially equivalent to the original phosphor material and without rebuilding or other complicated processing steps being needed. The essential steps in the pres...

A method of recovering a rare earth phosphor from a mixture which contains this phosphor and at least one sulphide and/or selenide of zinc and/or cadmium. The mixture is treated in an aqueous alkaline solution which contains a hypohalogenite and whose pH is larger than 12. The rare earth phosphor is subsequently separated from the liquid and washed with water, optionally after rinsing with a diluted acid.

Lubricating compositions are disclosed which comprise a major amount of an oil of lubricating viscosity, thickened to a grease consistency with an oil thickener and a minor amount of a rare earth halide.

A cobalt-rare earth intermetallic permanent magnet having a high intrinsic coercive force is substantially or completely demagnetized by low energy means. The magnet is heated to an elevated temperature ranging from 40 to 75 percent of its Curie temperature. At such temperature it is demagnetized and the extent of this demagnetization depends largely on the specific temperature to which the magnet is heated and its self-demagnetizing field. If necessary, an external demagnetizing field, which is...

Rare earth metals are adsorbed on an ion exchange fiber comprising an ion exchanger having a strong cation exchange group and a weak cation exchange group, and the adsorbed metals are fractionally eluted with an aqueous solution of a chelating agent, whereby the respective rare earth metals can be separated at high efficiency in a short time. According to this method, elution can be accomplished at an elution rate of 5.0 or above in terms of space velocity.

A rare earth-cobalt supermagnetostrictive alloy having a composition represented by the general formula, in atomic fraction: R (Co.sub.1-x Fe.sub.x).sub.x, wherein 0.001.ltoreq.x.ltoreq.0.8, 0.2.ltoreq.z.ltoreq.15, and R is at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu and is consisting essentially of a cubic system whose easy axis of magnetization is generally <100> or <110> oriented; or R (Co.sub.1-x...

A pyrochemical process is utilized to recover 99% of the remaining transuranium materials from plutonium-uranium extraction waste. One step of the overall pyrochemical process involves the electrochemical separation of the waste components. A solid anode and a solid cathode are used in this electrochemical separation step to electrorefine in single or multiple steps. The solid anode and solid cathode are selected from certain preferred anodic and cathodic materials. Where multiple electrorefinin...