Abstract: A molybdenum carbide compound is formed by reacting a molybdate with a mixture of hydrogen and carbon monoxide. By heating the molybdate powder from a temperature below 300° C. to maximum temperature 850° C., a controlled reaction can be conducted wherein molybdenum carbide is formed. A high surface area, nanograin, metastable molybdenum carbide can be formed when the reaction temperature is below 750° C. The metastable molybdenum carbide is particularly suitable for use as a catalyst for the methane dry reforming reaction and the water gas shift reaction.

Abstract: A molybdenum carbide compound is formed by reacting a molybdate with a mixture of hydrogen and carbon monoxide. By heating the molybdate powder from a temperature below 300° C. to maximum temperature 850° C., a controlled reaction can be conducted wherein molybdenum carbide is formed. A high surface area, nanograin, metastable molybdenum carbide can be formed when the reaction temperature is below 750° C. The metastable molybdenum carbide is particularly suitable for use as a catalyst for the methane dry reforming reaction and the water gas shift reaction.

Abstract: Tungsten carbide is formed from a tungsten material which is preferably tungsten carbide scrap. If scrap material is used, this is oxidized and acid leached to remove impurities and any binder material. This is then dissolved in a solution of sodium hydroxide and spray dried to form a precursor compound. A carbon compound such as citric acid can be added to the solution prior to spray drying to provide a carbon source for the tungsten carbide. The powder formed from the spray dried solution is calcined and carburized to form tungsten carbide.

Abstract: A molybdenum carbide compound is formed by reacting a molybdate with a mixture of hydrogen and carbon monoxide. By heating the molybdate powder from a temperature below 300° C. to maximum temperature 850° C., a controlled reaction can be conducted wherein molybdenum carbide is formed. A high surface area, nanograin, metastable molybdenum carbide can be formed when the reaction temperature is below 750° C. The metastable molybdenum carbide is particularly suitable for use as a catalyst for the methane dry reforming reaction and the water gas shift reaction.

Abstract: A powder for sintering to manufacture a diamond tool has an average particle size of less than 8 &mgr;m and a loss of mass by reduction in hydrogen of less than 3% and contains 10-80% Fe, up to 40% Co, up to 60% Ni and up to 15% M. M is present, at least partially, in the oxidized state and representing one or more of the elements Mn, Cr, V., Al, Mo and Ti, the balance being unavoidable impurities. This powder may be sintered at 650-1000° C. to give a matrix having a high hardness.

Abstract: The present invention relates to the use of a pre-alloyed powder as a binder in the manufacture of diamond tools by hot sintering. This powder is characterized in that it has an average particle size of less than 10 &mgr;m as measured with the Fisher SSS and loss of mass by reduction in hydrogen of less than 2% as measured according to the standard ISO 4491-2:1989 and in that it contains, in % by weight, up to 40% of cobalt, up to 50% of nickel, from 5 to 80% of iron and from 5 to 80% of copper; the other components in the powder consist of unavoidable impurities.

Abstract: A process for the conversion of iron bearing residues from the non-ferrous process industry into a synthetic rock, comprising the following steps: 1 part of the wet residue is mixed with at least 0.1 parts by weight of crushed blast furnace slags and with at least 0.1 parts by weight of crushed converter slags; water is added to the mixture to obtain a stiff paste; and the paste is allowed to harden, while kept wet, to such an extent that the resulting rock is usable for construction purposes.

Abstract: A preformed roof cover element consisting essentially of a quadrilateral panel (1) with the shape of an isosceles trapezium whereof the two non-parallel sides (2 and 3) have rims (4 and 5) extending substantially over the whole length of the sides. The rims (4 and 5) are raised on the same panel (1) side. The length of one of the trapezium bases (6) is substantially equal to that of the other base (7) increased by twice the thickness of the rim (4 and 5) wall so as to enable the rim (4 and 5) ends (8) to be engaged on the shortest base (7) side with the panel part bordered by the ends with a predetermined element between the ends (9) located at the longest base (6) side of another element extending in a projection of the predetermined element and parallel to the rims (4 and 5).

Abstract: A molybdenum carbide compound is formed by reacting a molybdate with a mixture of hydrogen and carbon monoxide. By heating the molybdate powder from a temperature below 300° C. to maximum temperature 850° C., a controlled reaction can be conducted wherein molybdenum carbide is formed. A high surface area, nanograin, metastable molybdenum carbide can be formed when the reaction temperature is below 750° C. The metastable molybdenum carbide is particularly suitable for use as a catalyst for the methane dry reforming reaction.

Abstract: A process for recovery of zinc from sphalerite containing ores or concentrates, whereby, in a first step, these ores or concentrates are submitted to a thermal treatment consisting essentially of a heating cycle performed under non-oxidizing conditions above 900.degree. C. thereby at least partly transforming the sphalerite to wurtzite, and subsequently the wurtzite is quenched in such conditions as to retain at least partly the wurtzite after quenching. In a second step zinc is leached out of the converted ore or concentrate, and in a third step zinc is recovered from the leaching solution by electrolysis.

Abstract: A zinc bath, which is particularly useful for batch-wise galvanizing of steel articles, of which the silicon content is not certain, contains 1-5 wt % of tin, 0.01-0.1 wt % of nickel, lead at a concentration up to saturation, and at least one of aluminum, calcium and magnesium, with the rest being zinc of any quality going from remelted scrap to SHG zinc.

Abstract: A process for the preparation of silver coated particles useful as polymer fillers is provided. Copper coated, or copper particles are dispersed in an alkaline ammoniacal solution to remove impurities and activate the surfaces thereof. A combined completing and reducing agent is added. Finally, a solution containing silver ions is used to coat the particles with a uniform layer of silver.

Abstract: Process for continuously galvanizing steel sheet by passing the sheet through a bath consisting of zinc, aluminium and silicon, the aluminium content ranging from 0.05% to 0.5% by weight and the silicon content from 0.005% by weight up to saturation.There is neither formation of aluminiferous floating dross nor formation of bottom dross in such a bath.

Abstract: A portion of the concentrates is roasted and a portion of the resulting calcine is subjected to a neutral leaching step. Another portion of the concentrates is directly leached in an acidic medium in the presence of oxygen and under atmospheric conditions together with at least a portion of the neutral leaching residue. The zinc- and iron-rich solution resulting from acid leaching is neutralised with another portion of the calcine, the iron is removed and the solution is reused in the neutral leaching step. The method enables a gradual increase in the capacity of an existing zinc plant in accordance with demand, while capital costs may advantageously be spread out over time.

Abstract: The alloy is free from cadmium and it contains 0.001-1% In, 0.005-1% Mn and possibly up to 1% Pb, 0.005-1% Al and/or 0.0005-0.1% REM, REM being a rare earth metal or a mixture of rare earth metals. These alloys have a sufficient mechanical strength and resistance to corrosion and are easy to be processed.

Abstract: Process for extracting Ge, Ga, In, As, Sb, Bi, Pt, Pd, Ni, and/or Co from an acid aqueous solution, wherein use is made of a resin with 8-hydroxyquinoline groups, resulting from the reaction of an aminated resin with an aldehyde and 8-hydroxyquinoline, characterized in that the aminated resin itself is obtained by imidoalkylation of a cross-linked styrene-copolymer and an ester or an ether of an N-hydroxyalkylimide and by hydrolysis of the imidoalkylation product.

Abstract: A germanium bearing sulphate solution containing indium and/or gallium is brought at pH 1-2.5 into contact with an organic phase, containing a substituted 8-hydroxyquinoline and an acid organophosphorus compound. So, in addition to germanium, indium and gallium are also extracted from the sulphate solution.

Abstract: A zinc base powder for alkaline batteries consisting of 0.005-2% aluminum, 0.005-2% lead, 0.003-2% bismuth and 0.001-2% indium, the rest being zinc and unavoidable impurities.

Abstract: Nodule dredge comprising one or more of the following: convergent wall device, e.g., "horn member", for accelerating liquid flow through the apparatus; comb or grid-like collecting or lifting device that can lift nodules into accelerated flow without necessarily lifting an entire layer of silt, especially where silt is relatively loose; inclined surface to receive and raise nodules driven down stream by accelerated flow, while silt is removed; and collection chamber below nodule path defined by inclined surface, to receive nodules from inclined surface.

Abstract: Process for extraction of germanium from aqueous acid solution by contacting with an organic liquid containing a hydroxy-oxime and recovering the extracted germanium from the organic phase.