Abstract: An improved process for the production of mechanically strong shaped crystalline zeolitic aluminosilicate bodies from precursor bodies composed of kaolin clay calcined at elevated temperature, the crystallized bodies having essentially the same size and shape as the precursor bodies. Conversion of the calcined clay contained in the precursor bodies to a mixture of crystalline zeolitic alluminosilicate component and a porous amorphous silica-alumina component takes place as a result of reaction between the calcined clay and an aqueous alkaline liquid in which the bodies are immersed. The improved process features the presence of a solution of aluminosilicate nucleation centers during such reaction.

Abstract: Cis-diammineplatinum(II) organophosphate complexes where the organophosphate moiety is a glycerophosphate or a monosaccharide phosphate moiety are prepared by reaction of cis-diaquodiammineplatinum(II) salts with alkali metal organophosphates. The resulting complexes possess pronounced anti-tumor activity in mice and low toxicity; consequently, they have high therapeutic indices.

Abstract: Ethylenediamine platinum(II) and 1,2-diaminocyclohexane platinum(II) pyrophosphate complexes are prepared by reaction of the appropriate diaquo platinum(II) salt with a pyrophosphate salt. These complexes possess pronounced anti-tumor activity and low toxicity and thus have high therapeutic indices.

Abstract: A corrosion-resistant dental alloy is disclosed which has improved handling characteristics during the filling of a dental cavity. The alloy is a substantially uniform blend of three types of particles having the same chemical components, but differing in morphology and, optionally, in proportions of components. One type of particle is spherical or spheroidal in form. The second type of particle is a randomly-shaped microcrystalline form. The third type of particle is a flake-like particle. Handling characteristics of an amalgam prepared from such three particles can be adjusted to suit the requirements of the user by varying the relative proportions of the three types of particles while still retaining the corrosion resistance of the particles.

Abstract: A process for preparing a rare earth nitrate solution in which rare earth hydroxides containing quadrivalent cerium are dissolved in nitric acid with the addition of hydrogen peroxide. The change in oxidation-reduction E.M.F. may be used to control the addition of peroxide to prevent formation of quadrivalent cerium ions in the nitrate solution.

Abstract: Tin values in the form of cassiterite (SnO.sub.2) are recovered from aqueous pulps of finely divided cassiterite-bearing ore, preconcentrate or concentrate by froth flotation. The ore pulps are deslimed thoroughly, partially or not at all. Slimes, gangue or waste minerals in the pulps are selectively depressed by use of a metal salt/silicate reagent combination. The cassiterite is floated at a mildly acidic to neutral pH, generally in the range of about 5 to 6, by one and/or more highly selective tin collectors such as sulfosuccinamates, aspartates, phosphonates, etc., at environmental or, preferably, elevated pulp temperature. Flotation machine impeller speeds are within conventional range or higher, preferably the latter. The cleaning of the thus-produced cassiterite rougher flotation concentrate is performed after an additional (secondary) conditioning step whereby an additional depressant, such as tannic acid, sulfuric acid, sodium fluosilicate, sodium lignin sulfonate or activated charcoal is used.

Abstract: A corrosion-resistant dental alloy is disclosed which has improved handling characteristics during the filling of a dental cavity. The alloy is a substantially uniform blend of two types of particles having the same chemical components, but differing in morphology and, optionally, in proportions of components. One type of particle is spherical or spheroidal in form and the second type of particle is a randomly-shaped microcrystalline form. Handling characteristics of an amalgam prepared from such alloys can be adjusted to suit the requirements of the user by varying the relative proportions of the two types of particles while still retaining the corrosion resistance of the particles.

Abstract: Catalysts having good high temperature stability which are particularly useful for carrying out high temperature reactions, such as combustion reactions at temperatures of the order of 1000.degree.-1400.degree. C., are disclosed. The catalytically active materials include precious metals, base metals or their oxides, or precious metals in combinstion with base metals, deposited on a catalyst slip or composite which contains alumina in admixture with a metal oxide component. The metal oxide component consists of a mixture of strontia or barium oxide with either molybdenum trioxide, zirconia, silica, or stannous oxide, or of a mixture of lanthana with either silica or stannous oxide. The slips or carrier compositions are calcined at a temperature of at least 500.degree. C. before deposition of the precious metal or base metal material, and are characterized by having a surface area of at least 20 m.sup.2 /g after calcination at a temperature of 1200.degree. C. for 4 hours.

Abstract: A process for exchanging isotopes of hydrogen, particularly tritium, between gaseous hydrogen and water is provided whereby gaseous hydrogen depeleted in tritium and liquid or gaseous water containing tritium are reacted in the presence of a metallic catalyst.

Abstract: A novel particulate material for promoting combustion of carbon monoxide to carbon dioxide in the regeneration zone of a cyclic fluid cracking process without substantially affecting the ability of separate fluid cracking catalyst particles containing an active crystalline zeolitic aluminosilicate component to catalyze the hydrocarbon conversion reaction in the conversion zone. The novel promoter particles comprise coherent, catalytically inert microspheres of calcined kaolin clay having a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of about 2/1, a surface area (B.E.T.) in the range of about 10 to 15 m.sup.2 /g., a pore volume (as determined by nitrogen absorption) in the range of about 0.02 to 0.04 cc./g., the calcined microspheres being impregnated with a trace amount of a platinum compound and being free from a component capable of cracking hydrocarbons in the absence of added hydrogen.

Abstract: A reagent schedule useful for the froth flotation of undeslimed cassiterite ore pulps comprises a metal salt/silicate hydrosol dispersant/depressant and a N-alkyl sulfosuccinamate collector, the sulfosuccinamate preferably being emulsified with a heavy neutral petroleum hydrocarbon oil such as mineral oil. In flotation of cassiterite from an undeslimed ore pulp, the collector is used along with a metal salt/silicate hydrosol dispersant/depressant at a pH in the range of about 4 to 7.

Abstract: Gold electroplating solutions, particularly useful for plating onto nickel-iron substrates, are prepared utilizing electrolytes of relatively low conductivity, such as boric acid, alkali metal and ammonium acetates, nitrates, sulfates and orthophosphates. The gold is plated onto substrates using a current density ranging from about 1 to about 2000 amperes/square foot at a temperature of about 20.degree. to about 90.degree. C.

Abstract: Ethylenediamineplatinum(II) 2,4-dioxopyrimidine complexes are characterized by high anti-tumor activity and low mammalian toxicity.

Abstract: Macrosized catalysts suitable for promoting chemical reactions, especially to reduce pollutants in waste gas streams such as automobile exhaust, are described. The catalysts have one or more metal components, especially a platinum group metal component, as a catalytic promoter combined with a high surface area, refractory oxide support. Alumina is added to the macrosize catalyst to provide protection against poisoning by extraneous materials such as lead, zinc, other metals, sulfur or phosphorus with which the catalysts may come in contact during use. These catalysts may have a relatively catalytically-inactive carrier, especially a monolithic carrier which may be of the honeycomb type.

Abstract: An air-to-fuel ratio control mechanism in an internal combustion engine operates in partial response to the output of a control circuit, which circuit in turn is responsive to the output of an oxygen sensor mounted in the exhaust of the engine. The control circuit biases the control mechanism toward a predetermined desired air-to-fuel ratio, normally at or near stoichiometric. When the sensor output deviates above a first predetermined value or below a second predetermined value for longer than a predetermined time period, a comparator circuit provides a disabling signal which disconnects the control circuit from the air-to-fuel ratio control mechanism. At the same time, the disabling signal connects a predetermined signal to the air-to-fuel ratio control mechanism. This predetermined signal simulates a nominal control circuit output to maintain the air-to-fuel ratio close to stoichiometric or some other preferred setting such as a air/fuel ratio which is lean.

Abstract: A process for the preparation of magnesium compounds from breunnerite or from mineral concentrates or tailings containing breunnerite in which the mineral is calcined and treated with an acid and the magnesium salt solution so formed is separated from insoluble matter.

Abstract: An improved method of preparing magnesium chloride in which magnesium oxide, hydroxide or carbonate or a material containing magnesium oxide is caused to react with waste chlorides produced in the manufacture of titanium tetrachloride and the solution of magnesium chloride so formed is separated from insoluble matter.

Abstract: A first mixture of carbonaceous fuel and air is passed into the presence of a catalyst for essentially adiabatic combustion at a temperature above the instantaneous auto-ignition temperature of the mixture but below about 3,000.degree. F., thus avoiding nitrogen-oxide-forming temperatures. The gaseous effluent of this combustion is mixed with an additional fuel-containing component, which differs from the first mixture and which may utilize a different fuel, and the resulting mixture is homogeneously combusted at a temperature above the catalyst temperature, and above about 2,500.degree. F., to produce a gaseous effluent for use as a source of heat or power.

Abstract: Anhydrous alumina powder, preferably powdered alpha-alumina, is formed into a high solids slurry in water containing one or more soluble compounds that yield Na.sub.2 O when heated in air, preferably a mixture of sodium carbonate and sodium nitrate, and optionally containing one or more soluble compounds that will yield lithium oxide, magnesium oxide or mixtures thereof, when heated in air. The slurry is rapidly dried, preferably by spraying in air, to precipitate the metal oxide precursor(s) and form an intimate substantially homogeneous mixture with the anhydrous alumina particles. This precursor powder is pressed into a shaped article, and heated to decompose the source(s) of metal oxide, react the components to form the desired beta-alumina phase, and sinter the article to produce the dense polycrystalline beta-alumina.

Abstract: Macrosized catalysts suitable for promoting chemical reactions, especially to reduce pollutants in waste gas streams such as automobile exhaust, are described. The catalysts have one or more metal components, especially a platinum group metal component, as a catalytic promoter combined with a high surface area, refractory oxide support on a relatively catalytically-inactive carrier, especially a monolithic carrier which may be of the honeycomb type. An aqueous solution of an alumina precursor is added to the macrosize catalyst to provide protection against poisoning by extraneous materials such as lead, zinc, other metals, sulfur or phosphorus with which the catalysts may come in contact during use.