Abstract: The invention relates to cap or booster sensitive explosives for application in bulk or cartridge form in boreholes. The oxidizing salt of the explosive is ammonium nitrate, sodium nitrate and/or calcium nitrate having untamped bulk density of 0.3-0.7 g/cm.sup.3. The explosive can be a w-i-o emulsion explosive where the discontinuous phase is an aqueous solution of the oxidizing salts and where low density ammonium nitrate comprises 10-80 weight % of the total explosive. ANFO, HANFO and water-gel explosives comprising said oxidizing salts having untamped bulk density of 0.3-0.7 g/cm.sup.3 are examples of explosives according to the invention. The above types of explosives are especially suitable in small and medium size boreholes without using sensitizing or density reducing agents.

Abstract: A method for coating high energy explosive crystals is carried out in a fluidized bed apparatus, in which moist explosive crystals are predried and coated with a dispersion of flegmatizing and binding agents injected into said apparatus through nozzles, whereby said explosive crystals form agglomerates and said agglomerates form granules. Water from the dispersion is evaporated and the granules ready for use are discharged.The method is particularly suitable for coating HMX, RDX and pentrite and may be used on explosive crystals having a grain size of about 1 mm, as well as about 150 microns and even below 20 microns.The dispersion comprises, as a main ingredient, for instance plastic or wax.

Abstract: A castable high-energy explosive composition comprising trinitrotoluene (TNT) and crystalline explosives of the RDX or HMX type as well as aluminum powder, and, optionally, flegmatizing agents and stablizers consisting of wax, lecithin and nitrocellulose (NC), is prepared by dispersing crystals of RDX (or HMX) in water with wax, under heavy stirring and a temperature above the melting point of the wax, then adding aluminum powder, treated in order to tolerate water, to the dispersion, and then, optionally, cooling in order to separate the explosive as granules. A further step comprises melting and dispersing TNT in hot water under heavy stirring, optionally under the addition of wetted NC and lecithin, then reducing the temperature to below 80.degree. C., and separating the solidifying, dispersed explosive droplets in the form of granules.

Abstract: A building structure for recurrent detonation of explosive charges of up to several hundreds of kilos with the aim to obtain effective sound dampening and economical use of materials.The building comprises a tube shaped steel structure (2) with two gable walls (4,4) inside the tube and which defines an explosion chamber (6) in the center portion thereof. One or preferably both of said two gable walls are apertured by a plurality of through-going openings. A webbed wall or the like (20) is situated at least in one end portion of the tube which together with respective adjacent gable wall (4) defines one, respectively two, gable chambers (16) which are filled with a mass of stones (18) or the like. The tube shaped steel structure is positioned horizontally and freely resting on a sand bed (36) or the like and is covered along its entire length with sand (38). The building is effective to obtain a sound dampened gas discharge and a pressure relief.

Abstract: A cap-sensitive explosive composition in powder form contains, in addition to ammonium nitrate as its single oxygen releasing component, and optional components commonly used in explosive compositions, four components within specific weight ranges, calculated on the basis of the weight of the explosive composition:(a) 3 to 8% of a combustible liquid consisting of one or more completely water soluble components, having a boiling temperature of above 120.degree. C., and being capable of dissolving ammonium nitrate in amounts of between 20 grams and 100 grams per 100 grams of said liquid without reacting chemically with ammonium nitrate;(b) 0.5 to 2.5% of a water blocking agent consisting of a high molecular weight polysaccharide having the property of imparting high viscosity to an aqueous, saturated ammonium nitrate solution;(c) 0.

Abstract: A static mixer for continuously mixing powder or suspension materials with liquid materials, especially explosive components, includes a toroidal mixing chamber having a central pipe nozzle inlet for pressurized powder/suspension material and annular conical slit-nozzles for pressurized liquid material. A conical spreader body arranged coaxially downstream of the central pipe nozzle inlet forms the powder/suspension jet from the pipe nozzle into a thin conical high speed spray that hits the thin conical high speed liquid spray from the conical split nozzles in a common circular unsupported or "floating" mixing zone.

Abstract: The present invention relates to an aqueous explosive composition which consists of at least one inorganic oxygen-supplying substance, at least one combustible substance and at least one thickening agent, at least one of combustible substance being liquid and substantially water insoluble and the aqueous phase of the explosive composition having dissolved therein a lignosulphonate in an amount of up to 5% of the weight of the explosive composition.

Abstract: In preparing an explosive composition whose oxidizing components are a mixture of ammonium and calcium nitrate, the nitrate components are heated to temperatures where anhydrous double salts are formed together with some liquid phase. By subsequent cooling of the mixture under sustained mechanical agitation and the addition of a liquid fuel, a dry, free-flowing, cap sensitive particulate explosive composition is formed.

Abstract: Blasting oil contained in the effluent from the production of explosives containing nitroglycerine is recovered by extracting with nitroaromatics which make part of the final explosive, the resulting extract being used completely in the explosive production. Residues of nitroaromatics may be removed from the purified effluent by means of an extraction liquid being sparely water-soluble, such as toluene or xylene or a mixture thereof.

Abstract: Aqueous trinitrotoluene is dried by means of air which is passed through the melted trinitrotoluene by passing the melted trinitrotoluene over a porous area and forcing hot air from below through the porous area and the melted material. The porous area is preferably made of a material having a pore size of 20-50 m.mu..

Abstract: A method of continuously processing meal black powder in order to make it suitable for use in fuses, wherein a conventionally produced meal black powder is blended with about 20 % of water; said moist black powder is compressed to a coherent body in the form of sheets; said sheets are rubbed through a sieve; said sieved powder is agglomerated into spherical grains; said grains are dried to a moisture content of about 1 % and are sieved in order to provide a fraction having a grain size in the range of 0.3 and 1.0 mm.

Abstract: Apparatus for so-called "in-line" production of hollow articles of thermoplastic material, by blowing or vacuum moulding a sheet strip produced continuously from an extruder and subsequent stamping of the separate articles. The mould tool consists of at least two mould half portions, which is moved along a rectilinear guide and substantially synchronously with the plastic strip. The guide for the mould tool and the direction of the sheet strip extend obliquely downwardly from the extruder nozzle, preferably at an angle to the horizontal plane of 30.degree.-60.degree. . In the zone of the guide path where the mould half portions open, stationary gripping fingers are arranged on both sides of the sheet strip. The fingers are adapted to engage the longitudinal edges of the sheet strip immediately prior to the mould half portions, being separated and to absorb the sheet strip while the mould tool returns for enclosure of a new portion of sheet strip.