Abstract: The present invention relates to a method for production of alkylhalosilanes by reaction between elemental silicon and an alkylhalide at elevated temperatures in the presence of a copper-based catalyst and optionally promotors. Aluminium in the form of metallic aluminium, or an aluminium alloy, or an aluminium containing silicon alloy or an aluminium containing compound or mixtures thereof are added to the reactor in an amount between 0.01 and 1% by weight calculated as aluminium based on the weight of silicon supplied to the reactor.

Abstract: The present invention relates to method for treatment of residues originating from organochlorosilanes- and/or chlorosilane syntheses. The residues are, optionally together with an oxidation agent, supplied to a smelting furnace where the residues are melted in order to form a molten metallic phase comprising at least of silicon and copper and a slag phase, tapping of the metallic melt and an inert slag from the smelting furnace. Copper is dissolved from the solidified silicon-copper containing metallic phase by leaching with a mineral acid in order to produce a solid product substantially containing silicon, whereafter copper is recovered from the leach solution.

Abstract: The invention relates to a method for quantitative analysis of one or more elements in a molten metal bath. Light from one or more light sources are focused against the surface of the molten bath and is reflected from the surface of the metal bath to a monochromator or a polychromator connected to detectors for detecting absorbed light in a gas layer associated with the melt of a wavelength or wavelengths corresponding to the element or elements to be analyzed. The absorption signals are proportional to the atom- or molecular density of the components to be analyzed and a function of the thickness of the gas layer and the concentration of the element or elements in the molten metal bath. The concentration of the elements to be analyzed is the calculated based or known relations between absorption signal, the thickness of the gas layer and the temperature of the metal bath.

Abstract: The process feeds a mixture of scrap metal, quartzite, carbonaceous material and wood chips to a submerged arc furnace to make a base iron suitable for iron foundry purposes. The mixture contains 1 to 20% quartzite, 5 to 15% carbonaceous material, 0 to 10% wood chips, all based on the weight of scrap in the mixture. By maintaining the charge in the furnace, good efficiencies are obtained.

Abstract: The present invention relates to a method for recovering iron chloride, aluminum chloride and calcium chloride from silicon and ferrosilicon or from residues which contain silicon and/or ferrosilicon and metal chlorides and optionally copper and/or copper compounds, which materials are leached with HCl or HCl+FeCl.sub.3 /FeCl.sub.2 solutions, whereafter the solid silicon or ferrosilicon residue is removed from the leach solution and where any copper is removed from the leach solution. Fe.sup.2+ in the leach solution is oxidized to Fe.sup.3+ whereafter the leach solution is subjected to a liquid-liquid extraction by means of an organic phase containing n-tributyl phosphate dissolved in a hydrocarbon solvent in order to extract FeCl.sub.3 and at least a part of CaCl.sub.2 from the leach solution, stripping FeCl.sub.3 and any CaCl.sub.2 from the organic phase by water, concentrating the remaining solution by evaporation and adding HCl gas to the solution in order to selectively precipitate AlCl.sub.3.6H.sub.

Abstract: The method is accomplished by having a casing affixed about the area of the equipment component or part subject to the abrasive wear. A wear-resistant concrete material is cast into the spacing between the casing and the surface of the equipment. A wear-resistant ceramic plate or steel plate can also be affixed to the surface of the equipment prior to casting the concrete in place.

Abstract: The present invention relates to a method for granulating a stream of molten metal which falls from a launder or the like, down into a liquid cooling bath contained in a tank. The metal stream divides into droplets in the liquid cooling bath and the droplets solidify and form solid granules. The cooling liquid has substantially uniform flow across the tank in a direction that is substantially perpendicular to the falling metal stream. The flow of cooling liquid has a velocity of less than 0.1 m/sec. The distance from the outlets of the launder to the surface of the liquid cooling bath is kept less than 100 times the diameter of the metal stream measured as the metal stream leaves the launder.

Abstract: The invention relates to a method for continuous production of silicon powder comprising the combination of the following steps:a) continuous production of silicon in an electric smelting furnace,b) refining and alloying of the molten silicon in a metal treatment vessel,c) continuous supply of modern silicon from the metal treatment vessel to a holding furnace,d) continuous supply of molten silicon to a closed atomizing apparatus wherein the molten silicon is atomized by means of an inert gas supplied from a pressure vessel or a compressor unit,e) continuous removal of atomized silicon powder from the atomizing apparatus,f) separation of atomized silicon powder and inert gas in a solid/gas separator,g) screening of the silicon powder into preset particle size fractions,h) supply of the different particle size fractions of silicon powder to closed product silos,i) filtration of the inert gas from step f) for removing any remaining solid particles from the inert gas,cooling and compressing the inert gas from st

Abstract: The present invention relates to a silicon powder, which is characterized in that it is produced by gas atomizing of molten silicon and having a particle size between 0,1 and 1000 .mu.m, a specific surface area between 0.001 and 1 m.sup.2 /g, and the following chemical composition in percent by weight:0.1-1% iron, 0.01-1% aluminium, 0-8% copper, 0-1% calcium, 0-1% zinc, 0-1% tin, 0-5% boron, 0-0.5% phosphorus, 0-0.5% sodium, 0-0.5% lithium, 0-0.5% potassium, 0-0.5% magnesium, 0-0.5% strontium, 0-0.5% barium, 0-0.5% beryllium, the rest being silicon and less than 0.3% impurities such as Ti, V, Cr, Mo, W and Zr.

Abstract: The present invention relates to a self-cleaning dosing pump system for delivering a slurry of solid particles and water. The dosing pump system comprises a membrane metering pump 10 and at least one sieve 11-13, arranged at the delivery end of the pump 10.

Abstract: A process for producing a polysiloxane oil with aryl groups and oxygen atoms as co-substituents on the silicon atoms. Silicon monoxide gas is reacted under a vacumm with iodine and an aromatic compound such as toluene in solution at a low temperature in the region of -75.degree. C. to -95.degree. C.

Abstract: The present invention relates to the use of manganomanganic oxide particles containing at least 90% by weight of manganomanganic oxide, said particles having a density of 4.50 to 4.75 g/cm.sup.3 and a particle size of at least 98% below 10 .mu.m, as a weight material for drilling mud fluids and for cement slurries for cementing oil wells.The manganomanganic oxide particles which are used are preferably recovered from off-gases which evolves during refining of ferro-manganese melts.

Abstract: A spray nozzle for dry shotcreting is disclosed. The spray nozzle has a first member through which dry concrete mix is passed, a second member attached to the first member through which water is passed, and a spray nozzle head. The spray nozzle head has a plurality of openings for water inlet from the second member into the dry concrete mix which passes into the spray nozzle head from the first member. The openings are arranged either circularly or helically about the circumference of the spray nozzle head. The number of openings available for water inlet can be adjusted by axial movement of the spray nozzle head.

Abstract: The method for treating the dust entails the following steps:(a) supplying a combination of dust, a reducing agent and flux to a gastight electrothermic smelting furnace,(b) smelting, reducing and volatilizing certain metals in the smelting furnace,(c) tapping of an inert slag phase and a liquid metal phase from the smelting furnace,(d) continuous removal from the smelting furnace of a gas phase containing chiefly CO-gas, metal fumes, sulphur, chlorides and fluorides together with entrained unreacted dust,(e) further treatment of the gas phase.The process produces an inert slag phase which can be safely deposited in a landfill. The process also allows for recovery of valuable metal components from the dust.

Abstract: The present invention relates to a dispensing equipment for adding inoculants to the stream of molten iron flowing from the spout of a tilting ladle. The dispensing equipment comprises a hopper (4) for the inoculant which hopper has an outlet opening (5) which extends through the wall of a first pipe 6. Means (9) is arranged for continuously and adjustably transportation of inoculant from the hopper (4) through the first pipe (6) and a second pipe 8 into the spout (1) of the ladle. The second pipe (8) is rotatably connected to the first pipe (6). A mounting frame (18) is suspended from the first pipe (6) by means of at least two bearings (16, 17), which bearings (16, 17) are rotatably arranged about the first pipe (6). The mounting frame (18) is firmly affixed to the second pipe (8), and a mounting arm (21) is fixed to the mounting frame (18), said mounting arm being intended to cooperate with a mounting bracket (3) on the ladle spout (1).

Abstract: The present application relates to a method for production of trichloromonosilane in a fluidized bed reactor by reaction of silicon powder and HCl at a temperature between 280.degree. and 300.degree. C. wherein silicon powder which has been produced by gas atomization of molten silicon is used. The gas atomized silicon powder has a preferred particle size between 1 and 1000 .mu.m.

Abstract: The method for treating the dust entails the following steps:(a) supplying a combination of dust, a reducing agent and flux to a gastight electrothermic smelting furnace,(b) smelting, reducing and volatilizing certain metals in the smelting furnace,(c) tapping of an inert slag phase and a liquid metal phase from the smelting furnace,(d) continuous removal from the smelting furnace of a gas phase containing chiefly CO-gas, metal fumes, sulphur, chlorides and fluorides together with entrained unreacted dust,(e) further treatment of the gas phase.The process produces an inert slag phase which can be safely deposited in a landfill. The process also allows for recovery of valuable metal components from the dust.

Abstract: The present invention relates to a cover for a tiltable ladle said cover having a pouring basin with at least one opening in its bottom communicating with the ladle. The cover is suspended in the horizontal beam of a ladle support frame by springs, said springs being intended to lift the cover away from the top of the ladle when the pouring basin is empty.

Abstract: The cement slurry of the present invention is gas tight, very low strength retrogression at high temperature, and substantially no tendency to settle or segregate. The cement slurry is made with a hydraulic cement, 5-85% microsilica based on the weight of the cement, 5-250% of a high density filler material based on the weight of the cement, 0-5% of a retarder (dry weight) based on the weight of the cement, 0-12% of a thinner (dry weight) based on the weight of the cement, 0-8% of a fluid loss additive (dry weight) based on the weight of the cement, 0-30% silica flour and/or silica sand based on the weight of the cement and water in such an amount that the cement slurry has a density between 1.95 and 2.40 g/cm.sup.3.

Abstract: Hydraulic cement slurry for use in cementation of oil wells containing hydraulic cement, 5-100% microsilica based on the weight of cement, 2-200% light weight aggregate with a real particle density between 0.1 and 1.5 g/cm.sup.3 based on the weight of the cement, 0-5% thinner (dry weight) based on the weight of the cement, 0-10% fluid loss additive (dry weight) based on the weight of the cement, and water in such an amount that the cement slurry has a density between 0.8 and 2.0 g/cm.sup.3.The cement slurry according to the present invention is gas tight and can thereby be used for cementation of oil well in fields having gas containing formations.