57results about How to "Improve detonation sensitivity" patented technology

The invention relates to high-safety emulsion explosive for a coal mine. The explosive comprises the following raw materials: ammonium nitrate, sodium nitrate, calcium nitrate, sensitizing agent, urea, compound flame inhibitor, water, compound emulsifier, a compound oil phase, foaming agent, foaming accelerating agent and expanded perlite; and the preparation steps of the high-safety emulsion explosive are as follows: preparing a water phase, preparing the oil phase, emulsifying, cooling, sensitizing and charging and packaging.The explosive performance accords with the GB18095-2000 standard, a mine-gas-safety test shows that the test reading is 250g, 0/5 when any flammable item is suspended, the mine gas does not ignite gas, and the safety level of the explosive is one grade higher than that of the explosive for three-grade coal mines with the highest grade in China; and on the premise of ensuring the safety of combustible gas, a new formula with the compound flame inhibitor, the compound foaming agent and ethanolamine nitrate or potassium nitrate added as the sensitizing agent is adopted, thus, the initiation sensitivity of the explosive is improved, the anti-deflagrability capability of the explosive is enhanced, and the safe production of the coal mine is better ensured.

The invention relates to the structure, charge and production process of a non-priming charge detonator. The invented non-priming charge detonator includes two types of instant detonators, electric igniter tip and non-electric plastic nonel, and a millisecond delay detonator with a lead core delay body. It stimulates the combustion of gunpowder in the steel pipe to generate high-pressure gas, which acts on the high explosive to make it burn in the steel pipe and develop into a high-speed detonation at the bottom of the steel pipe, thereby making a non-priming detonator. The design is optimized for reliable operation and simple fabrication.

The invention discloses a composite oil phase with nitromethane, in particular to the composite oil phase for powder type ammon explosives. The invention comprises the raw materials by weight proportions: 72 to 92 proportions of solid fuel oil, 5.0 to 20 proportions of liquid fuel oil, 2.0 to 5.0 proportions of nitromethane, and 1.0 to 3.0 proportions of condensation compounds of aromatic sulphonate and aldimine. The invention also discloses a preparation method thereof. The method comprises the steps as follow: the solid fuel oil is firstly melted, and liquid fuel oil, condensation compound of organic acid salt aldehydes and nitromethane are added in turn for being mixed fully, and then the mixture is cooled and packed. The invention is characterized in that the burning thermal value is high; the viscosity is small; and the dispersion on the surface of powder type ammonium nitrate grain to form a moisture proof anti-blocking water resistance oil membrane is easy, thus the detonation Sensitivity and the detonation energy of the powder type ammon explosives are improved. The utility model used for the powder type ammon explosives has the advantages that the oil phase with the nitromethane is simple and reliable, has low cost and facilitates the industrialization production and utilization.

In the prior art, the expanded ammonium nitrate explosive has disadvantages of low density, small volume power and easy agglomeration. For solving the disadvantages in the prior art, the present invention provides a modified expanded ammonium nitrate explosive with advantages of stable quality, simple production and low cost. The modified expanded ammonium nitrate explosive provided by the present invention has characteristics of good detonation sensitivity, stable detonation velocity, easy charging, no agglomeration, high charge density and large volume power. The technical scheme of the modified expanded ammonium nitrate explosive is that: the modified expanded ammonium nitrate explosive is prepared through mixing the following raw materials, wherein the raw materials comprise, by weight, 80-90% of expanded ammonium nitrate, 3-5% of hull, 2-3% of diesel fuel, 1-2% of % composite wax, 0.10-0.12% of qctadecyl amine, 0.2-0.5% of calcium fluoride and 2-12% of porous granular ammonium nitrate.

The invention discloses a powdery emulsion explosive for on-site mixed loading. The powdery emulsion explosive comprises powdery latex substrate and a sensitizer. The mass ratio of the powdery latex substrate to the sensitizer is 30: (1-1.5). The powdery latex substrate comprises sodium nitrate, crystal modifiers, flame inhibitors, water, compound additives, oil-phase materials, compound emulsifiers and emulsification assistants. The sensitizer comprises expanded perlite, carboxymethyl cellulose, polyvinyl alcohol, ammonium bicarbonate, phosphoric acid, water, urea and ammonium nitrate. The invention further discloses a preparation method of the powdery emulsion explosive for on-site mixed loading. The emulsion explosive has high detonation velocity, brisance and coupling degree and few fumes; cost is low, the state of the explosive is hard, and work capacity is high; less poisonous gas is generated during preparation, safety of operators can be improved, and environment protection can be realized; the preparation process is simple and easy to operate.

The invention discloses an emulsion explosive for high-stability smooth surface blasting. The emulsion explosive comprises the following components in parts by mass: solid ammonium nitrate: 30-40 parts, sodium nitrate: 7-9 parts, methylamine nitrate: 10‑13 parts, aluminum powder: 8‑10 parts, water: 7‑11 parts, density regulator: 7‑9 parts, stearic acid: 5‑7 parts, crosslinking agent: 4‑6 parts, foaming paste : 1-3 parts, composite emulsifier: 2-4 parts, sensitizer: 5-7 parts, pentaerythritol tetranitrate: 0.5-1 part; the present invention also designs a kind of emulsified explosive with high stability smooth blasting The preparation method is simple and easy, the preparation cost is low, and the prepared emulsion explosive has good detonation sensitivity and explosive performance, good stability and uniform quality.

The invention discloses a water-gel explosive which comprises a sensitizer, a density regulator, explosion enhancing metal powder, an oxidant, a reduction agent and a cross-linking agent. When explosives are subjected to explosion propagation roll by roll and the water-gel explosive bears the strong action of compression waves, a hot spot is provided by the existing density regulator, so that the explosive is detonated under pressure; by combining sensitization achieved through a sensitizer, sensitization achieved by absorbing micro bubbles through the explosion enhancing metal powder and sensitization achieved with the density regulator as a bubble carrier, the detonation sensitivity and explosion performance of the water-gel explosive in the environment with the water depth being 50 m or above are guaranteed. The detonation hot spot of the water-gel explosive is greatly increased by means of combined sensitization and material selection, the detonation sensitivity and explosion performance of the water-gel explosive are guaranteed when the explosive bears water static pressure at the water depth of 50 m or above, influences of deep water static pressure and permeation are effectively reduced, meanwhile the detonation sensitivity and explosion performance are guaranteed when the explosive bears strong compression waves in water, and an existing problem of deep water explosion is solved.

The invention discloses a method for preparing an anti-caking puffed ammonium nitrate explosive and relates to the technical field of puffed ammonium nitrate explosives. The method comprises the following steps: S1, adding 20-30% ammonium hydroxide into a 90-91% ammonium nitrate solution, adjusting the pH value of the ammonium nitrate solution, and keeping the pH value to 7.5-8.5; S2, adding 0.10-0.15 part by weight of a puffing agent into 100 parts by weight of the ammonium nitrate solution, and heating and puffing the ammonium nitrate solution into powdery ammonium nitrate; S3, adding the powdery ammonium nitrate into a mixing machine, and adding 4 parts by weight of dried wood meal, 4 parts by weight of an oil phase material and 0.1 part by weight of quicklime powder; and S4, performingcooling and dehumidification on the mixture, and performing uniform mixing, so as to obtain the puffed ammonium nitrate explosive.

The invention discloses a special water-gel explosive for an extremely-cold environment. In allusion to the reason for loss of detonator sensitivity during the use of the water-gel explosive in the extremely-cold environment, through a reasonable formula and a reasonable technology, the frost resistance and the detonator sensitivity of the water-gel explosive in the extremely-cold environment are improved, still good detonator sensitivity and explosive performance of the water-gel explosive in the extremely-cold environment of -25 DEG C are achieved, and using requirements are met. The special water-gel explosive for the extremely-cold environment overcomes the technical difficulties that a detonator of an ordinary water-gel explosive cannot be detonated smoothly in an extremely-cold environment of 25 DEG C below zero and the like, and meets the requirements when a user uses the water-gel explosive for blasting in the extremely-cold environment.

The invention discloses a heat-resistant porous granular ammonium nitrate fuel oil explosive. The heat-resistant porous granular ammonium nitrate fuel oil explosive is characterized by comprising, by weight, 92-98% of porous granular ammonium nitrate and 2-8% of oil-phase material, and the oil-phase material is base oil or is a mixture of the base oil and antioxidant. The invention further discloses a preparation method of the heat-resistant porous granular ammonium nitrate fuel oil explosive. The heat-resistant porous granular ammonium nitrate fuel oil explosive and the preparation method thereof have the advantages that by means of cooperation between the base oil and the porous granular ammonium nitrate, the base oil is adsorbed easily by the porous granular ammonium nitrate, and mixing is more uniform, so that detonation sensitivity of the explosive is improved; the prepared explosive can be used at the temperature above 120 DEG C, so that the problem of poor heat resistance of a porous granular ammonium nitrate fuel oil explosive at high temperature is solved.

The invention discloses an extrusion-resistant colloidal explosive for underwater explosion. The extrusion-resistant colloidal explosive comprises the following components: microcrystalline wax, a methylamine nitrate solution, methylamine nitrate, ammonium nitrate, sodium nitrate, perlite, a foaming agent, a foaming accelerant, sesbania powder, a stabilizer, a cross-linking agent, a surfactant, water, an oxidant, a sensitizer, an emulsification foaming adhesive and an emulsifier. The invention further designs a preparation process of the extrusion-resistant colloidal explosive for underwater explosion. The preparation process is simple and feasible, and the prepared explosive is high in extrusion resistance, high in bubble immobilization capability, long in preservation life and stable inquality, and bubbles are not liable to aggregate or overflow after being extruded.

The invention discloses a method for performing heat treatment on a sensitized explosive, which comprises the following steps: performing heat treatment on an explosive, keeping the temperature for a certain time, and cooling to room temperature, thus obtaining the porous sensitized explosive, wherein the heat treatment temperature is the initial decomposition temperature of the explosive +/- 10 DEG C. According to the invention, the explosive is subjected to heat treatment at the initial decomposition temperature, so that part of the explosive is decomposed and solvent is volatilized; and in the method, no sensitizer needs to be added, and micro/nano pores are increased in explosive crystals, so that the sensitivity to initiation of the explosive is enhanced, thus achieving self sensitization effect.

The invention relates to a formula technology of low-detonation-velocity seismic explosive columns. The technology adopts a low-detonation-velocity puffed ammonium nitrate explosive as a main charge to prepare the low-detonation-velocity seismic explosive columns. The formula of the low-detonation-velocity seismic explosive columns comprises 83.0-87.0% of puffed ammonium nitrate, 3.0-4.0% of wood powder, 2.0-3.0% of composite oil, 4.0-5.0% of a high-energy additive and 6-8% of a diluent.

The invention relates to a seismic charge with low detonation velocity. The process takes an expanded ammonium nitrate explosive with the low detonation velocity as a main charge to produce the seismic charge with the low detonation velocity. The invention provides an environmentally friendly formulation process for the seismic charge with the low detonation velocity, which can effectively improve the resolution of the obtained map data. The seismic charge with the low detonation velocity comprises the following components: 83.0% to 87.0% of expanded ammonium nitrate, 3.0% to 4.0% of wood flour, 2.0% to 3.0% of compound oil phase, 4.0% to 5.0% of high-energy additive and 6% to 8% of diluent.

The invention discloses a production process of powdery emulsion explosive without single-compound explosive. The production process comprises the following steps: (1) preparing an aqueous phase: dissolving ammonium nitrate and sodium nitrate into water, adding a dispersing agent and mixing uniformly; (2) preparing an oil phase: after melting a solid composite oil phase, pouring into a liquid composite oil phase and mixing uniformly; (3) preparing expanded oil ammonium nitrate: gathering and mixing the aqueous phase and the oil phase into a dynamic mixer according to the mass ratio of 1:1, discharging, feeding the materials mixed in the dynamic mixer into a tank, and performing negative pressure vacuum treatment to form the expanded oil ammonium nitrate; (4) preparing an adhesive: dissolving polyacrylamide into water; (5) preparing a finished product: adding porous particulate ammonium nitrate and light diesel oil into a mixing machine to obtain the finished product. The production process provided by the invention is simple and practical; the produced explosive has certain free-flowing property and cohesive property, excellent explosion property, high applicability, low pollutionand low cost.

The invention discloses an explosive recrystallization preparation method and a device for explosive crystallization. An explosive stock solution is poured into a grille crystallizing pan, and then the grille crystallizing pan is placed in a precise constant-temperature heating water tank, heated to 59-61 DEG C and kept at the constant temperature; a top-end air suction system is started, and the air suction speed is stabilized at 0.73-0.77 m/s, so that all explosives are crystallized. The device for explosive crystallization comprises the precise constant-temperature heating water tank, the grille crystallizing pan and the top-end air suction system, wherein the grille crystallizing pan is placed in constant-temperature water in the precise constant-temperature heating water tank, so that the periphery and the bottom of the grille crystallizing pan can be heated by the constant-temperature water, the top-end air suction system is arranged right above the grille crystallizing pan, and a grille of the grille crystallizing pan is arranged on the inner bottom surface of the grille crystallizing pan. The method and the device have a function of precisely controlling the temperature and the volatilization speed of the recrystallized stock solution, the initiation sensitivity of prepared explosives is obviously improved, the shock sensitivity is greatly reduced, and the production efficiency is substantially improved.