Societe Nationale Des Poudres Et Explosifs

Snpe Materiaux Energetiques

Snpe

Centre National De La Recherche Scientifique

Herakles

Arianegroup Sas

Jean-Michel Tauzia

Marie Gaudre

Jean R Grignon

Bruno F Gonthier

Andre E Lelu

François Cansell

Eric Giraud

Alain Le Floc'h

Eric Marchand

Marie Gaudre-Longerinas

Andre Hiss

Jean-Louis Trichard

Herv E Austruy

Marc Ferrari

Eric-Serge Giraud

The main subject of the present invention is a process for processing a paste () containing a solid charge (C) with a view to extracting at least one part of said solid charge (C). Said process comprises continuously:

Method for extracting solid soluble charges contained in a paste

The invention relates to a method for processing an aqueous effluent (E) containing in solution at least one type of metal (M) nitrite or nitrate whose oxide is stable in an aqueous medium consisting (I) in introducing cations NH+ in aqueous solution, generally in the form of an aqueous ammonia solution, into the aqueous effluent and, subsequently (II) in processing the obtainable medium at a temperature ranging from 100 to 700&#xb0; C. and a pressure of 1-50 MPa (i.e. from 10 to 500 bar), thereby converting the metal (M) nitrite or nitrate into metal (M) oxide, nitrogen and water.

Method for processing aqueous effluents containing metal nitrate or nitrite salts

Described is a process and a plant for destroying rocket motors, including in particular the following steps and stations: cutting of the motor into sections; cooling of the sections containing propellant by immersion in a cryogenic liquid; and fragmenting and extraction of the cooled propellant by elastic deformation of the casing of the section. The propellant fragments are recovered for subsequent treatment and the casings are deactivated before being scrapped.

Process and plant for destroying solid-propellant rocket motors

The invention concerns the field of ammunitions equipped with their fuze, found on the battlefield. Such ammunitions represent a major pyrotechnic risk. The problem consists in destroying the fuze so as to be able to dismantle said ammunition. The method consists in placing said ammunition () in a closed chamber () to carry out at least once the following cycle: depressurizing the chamber (), dissolving the fuze () of the ammunition () with a liquid corrosive agent, drawing off the gaseous effluents towards an auxiliary chamber (), reopening the chamber () after dissolving the fuze (), removing the ammunition (), recovering the mixture resulting from the attack of the fuze () by the liquid corrosive agent () and treating it by pyrolysis.

Method and plant for the destruction of a fuze mounted on a munition

A process for casting propellant paste into a mould to manufacture a block of solid propellant includes first mixing two groups of components briefly at low pressure, mixing the two groups of components at high pressure, and casting the mixture in a mould. The first group of components represents about 80% to about 99% of the finished product and essentially comprises a liquid prepolymer, at least one pulverulent solid charge and some of the various additives of the propellant paste. The second group of components represents about 20% to about 1% of the finished product and comprises the crosslinking agent and the rest of the additives.

Semi-continuous two-pack process for casting solid propergol paste

The subject of the invention is a particularly simple and inexpensive process for manufacturing tin/tungsten composite elements having a thickness of between 1 mm and 6 mm, such as spherical shot for hunting cartridges or fishing sinkers, from a tin/tungsten powder blend. The powder blend is extruded, in the solid state, directly into a wire whose thickness is between 1 mm and 6 mm with an extrusion rate&lE;80 mm/s. Next, the wire is cut into pieces which are then forged to the desired shape, especially into spheres. The subject of the invention is also the aforementioned process for obtaining the wire.

Process for manufacturing thin tin/tungsten composite elements

Process for the biological purification of a water containing ammonium perchlorate

The invention relates to a process for continuous manufacture of pyrotechnic charges containing a silicone binder and to the compositions capable of being used by this process. The following are introduced continuously into an extruder (1):

Process for continuous manufacture of pyrotechnic charges containing a

Destructible cores useful particularly for shaping the internal channels of cast propellant blocks. The cores include at least one elongated element which is shaped, for example by winding, the cohesion of which is ensured by way of a joining material and a portion of which is accessible from the exterior of the component to be cast. In order to obtain quickly cores having a high rigidity, the shaped element is a band which includes interlaced wires having free spaces, the joining material filling the free spaces.

Destructible core for undercut casting

The invention relates to a combustion inhibitor composition intended to cover partly the surface of blocks of double-base propellant. The inhibitor composition of the invention includes an aliphatic polyurethane obtained by the reaction of at least one polyisocyanate with a mixture of at least one polyetherpolyol containing at least three hydroxy groups per molecule and at least one polymer containing two hydroxy groups per molecule. This difunctional polymer is chosen from lactone polymers, such as poly-.epsilon.-caprolactone and polytetrahydrofuran. The inhibitor composition may also contain gasifiable fillers and an aliphatic plasticizer. The composition has good discreteness properties, while retaining excellent mechanical properties. The present invention has particular application in the field of solid weapon propulsion.

Combustion inhibitor based on an aliphatic polyurethane elastomer for a

A combustion inhibitor for a double base propellant is described which comprises a polyurethane elastomer having in chemically combined form a compound which is an aliphatic polyester polyol or an aliphatic polyether polyol, or a mixture thereof, which compound contains 2-6 hydroxyl groups per molecule, and an aliphatic polyisocyanate. The inhibitor also contains 0.1-10 parts by weight of mineral fibers or thermostable organic fibers of length between 0.1 mm and 15 mm per 100 parts inhibitor. The inhibitor may contain an organic gasifiable charge and an aliphatic plasticizer.

Growing community of inventors

Blanquefort, France

Jean-Michel Tauzia