Abstract: The use of a single phase aqueous hydrogen peroxide composition, comprising from 5 to 75% by weight of hydrogen peroxide and from 3 to 150 mg/kg of at least one alkyl phosphate, the composition having a total organic carbon content from organic compounds other than alkyl phosphates of less than 200 mg/kg, reduces foam formation in a method for producing chlorine dioxide by reacting an alkali chlorate with hydrogen peroxide composition in an acidic aqueous medium boiling at sub-atmospheric pressure.

Abstract: The present invention is directed to methods that can be used in the enrichment of metal sulfide ores in desired minerals in cases where the ores have sulfide-containing gangues. The method involves adding an oxidant to slurries prepared from the ores during, or immediately prior to froth flotation.

Abstract: In a method for recovering a copper sulfide concentrate by froth flotation from an ore containing an iron sulfide, wet grinding of the ore with grinding media made of high chromium cast iron alloy having a chromium content of from 10 to 35% by weight is combined with an addition of hydrogen peroxide to the conditioned mineral pulp before or during flotation in order to improve concentrate grade and recovery of copper sulfides.

Abstract: In a method for recovering a copper sulfide concentrate by froth flotation from an ore containing an iron sulfide, hydrogen peroxide is added to the conditioned mineral pulp before or during flotation, a concentration of dissolved oxygen is determined in the mineral pulp after addition of hydrogen peroxide and the amount of hydrogen peroxide added is adjusted to maintain a concentration of dissolved oxygen of from 1 to 5 times a predetermined target concentration, in order to adjust the amount of hydrogen peroxide to changes in ore composition.

Abstract: In a method for recovering a copper sulfide concentrate by froth flotation from an ore containing an iron sulfide, hydrogen peroxide is added to the conditioned mineral pulp before or during flotation in an amount effective to lower the redox potential of the conditioned mineral pulp in order to improve concentrate grade and recovery of copper sulfides.

Abstract: In a method for recovering a copper sulfide concentrate by froth flotation from an ore containing an iron sulfide, wet grinding of the ore with grinding media made of high chromium cast iron alloy having a chromium content of from 10 to 35% by weight is combined with an addition of hydrogen peroxide to the conditioned mineral pulp before or during flotation in order to improve concentrate grade and recovery of copper sulfides.

Abstract: The present invention is directed to methods that can be used in the enrichment of metal sulfide ores in desired minerals in cases where the ores have sulfide-containing gangues. The method involves adding an oxidant to slurries prepared from the ores during, or immediately prior to froth flotation.

Abstract: Disclosed is an apparatus for shaping food into a cylindrical roll, comprising a flexible band that has an internal side on which the food to be shaped can be placed. In order to be able to reliably and reproducibly shape the food, said apparatus is designed such that a frame is provided to which one end of the band can be or is attached in such a way that the internal side of the free end of the band can be placed on the external side of the attachable or attached end of the band in order to form a tube.

Abstract: A roll-up leash which comprises a casing (1) containing a winding drum (3), pivoting around an axis (2), biased in the direction of winding. This winding drum (3) has at least one catch (5) which, when the leash (4) unwinds, automatically extends outwards towards a catch stop (8). This catch stop (8) can be moved back, by means of a manually operated button (14), out of the direction of travel of the extended catch (5). The catch (5) is positioned swivel-mounted on an end face of the winding drum (3). To turn the catch (5) there is a rotating actuator (19) revolving with the winding drum (3) but limited relative to the same and having, to synchronise the rotating actuator after passing an idle clearance of the rotating actuator relative to the winding drum (3), two stops, and with the rotating actuator featuring means to extend and retract the catch (5) in the case of rotation relative to the winding drum (3).

Abstract: A retracting leash which supports, in a housing, a cable drum, which is under tension in the winding up direction and is connected coaxially with a gear wheel and for which a pawl stop, having a stop at the housing, is provided for blocking the gear wheel in one direction of rotation. The pawl stop is formed by a pinion, which meshes with the gear wheel and has a shaft, which is mounted displaceably in a guide of the housing, extending at least approximately coaxially to the axis of rotation of the gear wheel. The pinion or a pawl, connected with the pinion, in an end position of the shaft, lies against a stop at the housing, yet is held freely rotatable when the shaft is shifted in the opposite direction. An element for separating the stop from the pinion, acting counter to the force of a spring, is provided.

Abstract: A laminated composite material, and a method of improving the surface hardness of laminated composite materials, wherein selected regions of the carrier material of the laminated composite system are treated with high-energy beams, and the temperature control is designed in such a manner that the rays penetrate into a maximum a 0.1-fold the entire thickness of the carrier material. The temperature increase in the region of the sliding material is a maximum of 80% of the melting temperature of the lowest melting constituent of said material. The laminated composite material with a rear steel substrate surface can be post-hardened. The steel substrate has at least in one part of the surface facing away from the function layer a level of hardness increased by a factor of 1.5 or more than at a depth which corresponds substantially to 0.1-fold of the thickness of the steel substrate.

Abstract: A plain bearing shell (2a', 2b') exhibits a reduction in oil carbon formation on the plain bearing backing and an improvement in plain bearing interference fit during operation through a decrease in the relative movement between bearing backing and receiving bore. The ratio of the effective wall thickness W.sub.eff to the external bearing diameter D is defined by 0.012.ltoreq.W.sub.eff /D.ltoreq.0.02. The ratio of the installation free spread S to the external bearing diameter D is defined by: 0.025.ltoreq.S/D .ltoreq.0.05.

Abstract: Copolymers of ethylene with acrylates or acrylic acid are prepared by copolymerizing 100 parts by weight of ethylene with from 1.0 to 20.0 parts by weight of tert-butyl acrylate or tert-butyl methacrylate or acrylic acid or solutions of acrylic acid in acrylates in a continuously operated, tubular polymerization system at above 800 bar and at from 130.degree. to 320.degree. C. in the presence of a free radical polymerization initiator by feeding two gas streams into the polymerization system, by a process in which the first gas stream contains exclusively ethylene with a polymerization initiator and, if required, a polymerization regulator and the second gas stream contains a mixture of ethylene and tert-butyl acrylate or tert-butyl methacrylate or a mixture of ethylene with a solution of acrylic acid in acrylates and polymerization initiators and, if required, polymerization regulators.

Abstract: A process for preparing copolymers of ethylene with acrylic esters by copolymerizing 100 parts by weight of ethylene with from 0.1 to 25.0 parts by weight of acrylic ester in a continuous tubular polymerization system at from 500 to 4000 bar and from 100.degree. to 400.degree. C. in the presence of free radical polymerization initiators, comprises controlling the temperature for the reaction mixture, comprising ethylene, the acrylic ester, the polymerization initiator and optionally a regulator, after entry into the reaction zone in such a way that the ratio dT/dt (temperature increase per unit time) is kept constant at a value within the range from 1.5.degree. to 2.5.degree. C. per second.

Abstract: Delignification and bleaching of lignocellulosic material is enhanced after the pulp has been treated with peroxomonosulfuric acid.

Abstract: A kitchen appliance for slicing food has a slicing cylinder arranged rotatably in a housing. Material to be sliced is pressed against the slicing cylinder by means of a pusher which can be moved into a feeding chamber. The wall of the feeding chamber located at the rear in the direction of rotation of the slicing is fixed. The pusher is guided pivotably and displaceably in its vicinity. To the front it has a terminating wall which, during pressing, slides on the outside beyond the housing and completely seals the feeding chamber.

Abstract: A process and an apparatus are described for the production of peroxyacids from concentrated solutions of hydrogen peroxide and an oxyacid. The total amount of concentrated hydrogen peroxide is divided into at least two portions which are added separately in series to the concentrated oxyacid.

Abstract: Delignification and bleaching of lignocellulosic material is enhanced after the pulp has been treated with peroxomonosulfuric acid. The starting pH of the reaction with peroxomonosulfuric acid is between 7 and 11, and the reaction is continued until a final pH of 3 to 5 obtained. Subsequently the pulp is delignified and bleached with peroxide and/or oxygen.