JP2003026247A - Storing tank for bulk slurried explosive or its intermediate substance and charging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storing tank or a charging device capable of safely heating or keeping heated state of a bulk slurried explosive or its intermediate substance. SOLUTION: There is provided a storing tank or a charging device having a heating means or a heated state keeping means in which hot water or steam is applied as heating medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosive storage tank and a charging device used at a blasting site in industrial blasting such as crushed stone, mining, tunnel excavation and the like.

[0002]

2. Description of the Related Art The explosive loading method at a blasting site in Japan is either manual loading by a worker if it is a cartridge type explosive, or manual loading or ANFO if it is a fluid ammonium nitrate oil explosive (hereinafter referred to as ANFO). Machine loading by loader has been performed. However, by manual work, the blast hole must be approached, which is dangerous and takes a long time to load, and ANFO has poor water resistance and poor reactivity, resulting in a crushing effect. However, many problems have been sought, such as the problem of post-gas when blasting inside the mine.

In order to respond to this, recently, premixed bulk emulsion explosives manufactured as explosives in explosives manufacturing plants have been used in some sites,
Due to its fluidity, it is mechanically loaded, and efforts are being made to shorten loading time, save labor, and improve safety. However, premixing bulk emulsion explosives contain hollow particles such as glass microballoons and resin balloons that impair fluidity in their components, and their high volume ratio makes them highly viscous, and the viscosity increases as the temperature decreases. However, mechanical loading becomes difficult. If the viscosity becomes high, the friction in the loading device will increase, and if the explosive is clogged in the loading machine, the temperature will rise and the explosive may burn, especially in the pump with a large share. . Also, if the charging pressure is forcibly increased, the hollow particles in the explosive will be destroyed, and in some cases the performance as an explosive will be impaired, resulting in incomplete blasting, recovery work of non-explosives, and the presence of unstable rock mass. Post-work may occur.

The use of bulk emulsion explosives has already been generally carried out overseas, but as an intermediate of bulk emulsion explosives, the emulsion phase (hereinafter referred to as "hazardous substance"), which is not explosive and is simply handled as a dangerous substance in many countries , EP) is manufactured in a factory and mixed with an aqueous foaming agent solution at the blasting site to generate fine air bubbles in the EP to be sensitized and developed into a site-mixing bulk emulsion explosive. Used in. However, the reaction between EP and the aqueous foaming agent solution is very slow at low temperature, and it is the current situation that EP must be used in a state of being kept at 20 to 40 ° C.

At the site where storage at the above temperature is currently impossible, an electric heater and a heat insulating agent are installed in the storage tank in order to keep the EP at a constant temperature. However, providing the electric heater directly on the EP tank is very dangerous, such as when the temperature controller fails. In addition, since the loading device used does not have a heating device or a heat retaining device, if it is moved from the storage tank to the loading device once, the loading must be completed before the temperature drops, and by any chance other If it cannot be loaded for some reason, it has to be returned to a storage tank.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a bulk hydrous explosive or its intermediate, and an object thereof is to provide a storage tank or a loading device capable of safely heating and retaining heat at the site of blasting.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a storage tank or a loading device tank for a bulk water-containing explosive or its intermediate used at the site of blasting. By providing a heating means using a liquid such as heated water or vapor as a heat medium, and further providing heat insulating means on the bottom and side surfaces of the storage tank or the loading device tank, the temperature is raised more than necessary. The present invention has been completed, and it was found that it can be safely stored without being charged and the bulk hydrous explosive or its intermediate can be safely loaded without an increase in viscosity at the time of loading, and thus completed the present invention.

The bulk water-containing explosive referred to in the present invention is a water-containing explosive such as an emulsion explosive or a slurry explosive, which is a explosive having a fluidity that can be mechanically loaded using power such as a pump at a site of consumption. In addition, the intermediate is EP
For example, a bubble is generated in the intermediate body by chemical foaming at the site of consumption, or hollow particles such as glass microballoons and resin balloons are added to the intermediate body to be sensitized and become an explosive. It also includes non-sensitized explosives.

The heating means supplies, for example, a heating portion provided with a pipe or a passage or a space for passing a heat medium at the tank bottom portion or the tank bottom portion and the side surface, and hot water or steam as the heat medium. It is composed of a heat source. The heat source section has a heat generating section that heats water using an electric heater, a boiler, or the like. In addition, a circulation pump unit is provided if necessary. Moreover, it is desirable to provide a control unit using a temperature controller, a limiter, a pressure release valve, or the like. The temperature controller detects the temperature of the heat generating part and the temperature inside the tank and controls the heat generating part. The position of the heat source unit is provided separately from the storage tank and the loading device for safety reasons. The heat source may be disconnected when the loading device is heading to the face, which is the final blast site.

The decomposition initiation temperature of the bulk hydrous explosive or its intermediate is about 200 ° C. or higher under pressure. It is much safer to use warm water or steam for heating as compared to using an electric heater. In particular, in the case of hot water, it is desirable to keep the heat generating portion open so that it does not exceed the boiling point of water. The space of the heating section is a space between the outer surface of the tank and the surface where the bulk hydrous explosive or its intermediate comes into contact,
The bulk water-containing explosive or its intermediate is heated by passing hot water or steam through this space. A suitable thickness of this space is 10 to 40 mm.

The position of the pipe may be on the inner surface of the tank or on the outer surface. The cross-sectional shape of the pipe may be circular, square or trapezoidal, but when it is installed on the inner surface of the tank, the square or trapezoidal shape is preferable in consideration of the cleaning property. Further, after installing the pipe, a plate having a groove corresponding to the pipe may be installed. The material of the pipe is preferably non-corrosive and durable. For example, stainless steel, aluminum, plastic,
Such as rubber. Since metal has good thermal conductivity, it can be heated quickly. Plastic and rubber are easy to install and easy to repair.

As the heat insulating means provided in the tank, a general heat insulating material used in buildings, vehicles, refrigerators / freezers, and tanks can be used. For example, there are foamed resin, rock wool, glass wool and the like. A vacuum layer formed of a stainless plate or the like may be used as the heat insulating means. The position of the heat insulating material is the outermost part of the tank, and a plate made of stainless steel, aluminum, plastic, rubber, waterproof coated wood, or the like may be installed on the outer side of the tank for corrosion or waterproofing.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Experiments for heating and heat retention will be described below.

[0014]

Example: A rectangular stainless steel tank having a length of 1 m, a width of 1 m, and a height of 0.8 m is provided on the outer side of the bottom and side surfaces (height: 0.3 m).
Inner diameter 15 mm, outer diameter 19 mm so that there is no gap as much as possible
Fitted with a plastic tube. Furthermore, a foamed resin plate having a thickness of 3 cm was attached to the bottom and side surfaces of the tank. Then, 500 kg of 20 ° C. EP consisting of ammonium nitrate and water, an oil agent and a surfactant was charged, and the aluminum plate with a foamed resin plate having a thickness of 3 cm was attached to the lid, and the temperature was changed to 70 ° C.
Was supplied from the constant temperature water circulation device at a supply rate of 5 liters per minute. Stir the EP on a wooden plate every 30 minutes for about 5
After the time, it was confirmed that the EP temperature had reached 40 ° C., and the supply of hot water was stopped. After standing for 10 hours, the temperature of EP was measured and found to be 32 ° C. The temperature is 10 when left unattended.
It was below ℃.

[0015]

COMPARATIVE EXAMPLE Until the EP reached 40 ° C., the same tank, apparatus, EP and experimental procedure as in the example were used. After confirming that the temperature reached 40 ° C, the plastic tube and the foamed resin plate were all removed. The temperature of EP after standing for 10 hours was 12 ° C. The temperature during standing was 10 ° C or lower. From the results of the examples, it can be seen that the EP can be safely heated to a temperature range where a sufficient foaming reaction occurs by installing the heating device in the tank. Further, from the results of the example and the comparative example, it can be seen that by installing the heat insulating material in the tank, the EP can be kept warm for a long time in a temperature range where a sufficient foaming reaction occurs.

[0016]

INDUSTRIAL APPLICABILITY The present invention makes it possible to safely heat and keep the bulk hydrous explosive or its intermediate by installing a heating device or a heat insulating material using hot water or steam. .

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Claims (6)

[Claims] 1. A storage tank for a bulk hydrous explosive or an intermediate thereof having a heating means using a heated liquid and / or steam as a heating medium. 2. A storage tank for a bulk hydrous explosive or an intermediate thereof, which has heat insulating means on the bottom surface and / or the side surface. 3. The storage tank for a bulk hydrous explosive or an intermediate thereof according to claim 1, which has a heat insulating means on a bottom surface and / or a side surface. 4. A bulk hydrous explosive charge device having a heating means and / or a heat retaining means. 5. The loading apparatus according to claim 4, wherein the heating means uses the heated liquid and / or steam as a heat medium. 6. The loading device according to claim 4, wherein the heat retaining means is a heat insulating means provided on the bottom surface and / or the side surface.