Abstract: The invention concerns a novel fuel with high octane index and reduced lead content. Said fuel has a lead content not more than 0.56 gram per liter of fuel, containing at least a first hydrocarbon base (B1) consisting essentially of isoparaffins including 4 or 5 carbon atoms, and a second hydrocarbon base (B2) consisting essentially of isoparaffins including 6 to 9 carbon atoms, and optionally at least a complement (B3) consisting essentially of alkylaromatic hydrocarbons including 6 to 11 carbon atoms, and wherein: the base B2 content in the fuel ranges between 45 vol. % and 85 vol. % and preferably between 50 vol. % and 82 vol. %, and the ratio B1/B2 of amounts in volume % ranges between 0.10 and 0.60 and preferably between 0.15 and 0.45. The invention also concerns a method for preparing said fuel and uses thereof.

Abstract: The invention concerns a jet engine fuel having the following characteristics:i) distilling range from 140 to 300.degree. C.;ii) cis-decalin/trans-decalin ratio greater than 0.2;iii) aromatics content less than 22% by volume;iv) sulfur content less than 100 ppm, andv) lower heating value per unit volume greater than 34.65 Mj/liter.Also process for making the same wherein for example a cut from catalytic cracking distilling between 140 and 300.degree.0 C. is subjected to a hydrotreatment step and then to a dearomatization step.

Abstract: The device for charging metalliferous materials 7 into a furnace 3 compri a charging tube 1, inside which are arranged supports 8 distributed over an entire non-straight section of this, for example similarly to the stairs of a flight of stairs descending towards the furnace. Passages are provided between the supports 8, and means 10 for the vibration of the supports are provided.The materials progressively descend on the supports 8 towards the furnace and are simultaneously preheated by the hot gases introduced into the tube, circulating through the materials and via the passages 9 and extracted via the outlet orifice 5.

Abstract: The metallurgical vessel, such as a direct-current arc furnace, comprises a metal housing (1) lined on its inside with refractory material (2), at least one electrode (3) passing through the bottom of the vessel and connected to a terminal of an electrical power supply, the electrode being fastened to the metal housing by a mechanical fastening arrangement and insulated electrically from the housing. A leaktight wall (20) surrounding the fastening zone of the electrode prevents a liquid flowing over the inner surface of the housing from coming into contact with the electrode fastening arrangement, and orifices (26) are provided for discharging the liquid collected out of the housing. The invention is particularly applicable to direct-current arc furnaces and prevents the molten lead originating from the scrap metal of the charge and infiltrating through the refractory from damaging the electrical insulation of the fastening of the electrode.

Abstract: Novel products of the copper dihydrocarbyl dithiophosphyl dithiophosphate type, their preparation and their use are described.These products can be represented by the general formula: ##STR1## in which R particularly represents a substantially hydrocarbon monovalent radical with 1 to 30 carbon atoms, X and Y each represent a hydrogen atom or a substantially hydrocarbon monovalent radical with 1 to 30 carbon atoms, M represents copper in one of its two ordinary degrees of oxidation and n the degree of oxidation. The products according to the invention are usable as additives for lubricants in which they provide an effective protection against wear.