JPS5820918B2 - How to separate dust and solvent from gunpowder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes excess graphite and pretreatment (surfa).
ce treatment) and residues of alcohols, other solvents partially or completely soluble in water, from gunpowder dust and/or graphite present on surfaces treated with means for regulating the combustion rate. Regarding the method.

In this connection, after filling the bag with gunpowder, the gunpowder is placed on a wooden grate in a large plate vat sealed with a lid while open, the drained water is added, and the gunpowder is placed in steam or heated. It has previously been proposed to first remove the alcohol from heated, alcohol-moistened pretreated gunpowder by circulating it through an exchanger.

Such water treatment uses three different humidity levels (
50, 60 and 70 °C), at each temperature 6 to 24
Time is usually done.

The facility becomes very hot and humid, especially when large vats are open, and the environment becomes even more unpleasant when handling explosives containing nitroglycerin.

After water treatment, the gunpowder is dried at about 50°C in a special drying room, and the gunpowder bags are transferred from the drying room for sieving.

Such sieving is carried out on flat sieves or other sieves to remove unclogged graphite, gunpowder grinding agents and oversized and undersized gunpowder particles.

This is a very dangerous method when the gunpowder is dry at this stage, and this type of sieve contains some form of moving parts.

The sieved gunpowder is transported for final blending.

The purpose of the invention is primarily to simplify the above-mentioned method and make it safer and more legal for the operator.

The method according to the invention is particularly used for gunpowder that has been prescreened more than once during the process in such a way that there is still some solvent in the gunpowder, which burns gradually when ignited;
Including facilitating fire extinguishing.

Oversized and undersized gunpowder particles are then removed.

This leaves only the gunpowder dust resulting from the pretreatment and the separation of graphite and alcohol.

A feature of the method according to the invention is that the gunpowder is transferred in a suitable manner, for example by pumping it in the form of an aqueous suspension to the top of the container, where it is brought into contact with an upwardly directed stream of water; Through which the gunpowder falls and is washed, at the same time the impurities separated by it are carried upwards by the water stream and carried away through the discharge channel, where the washed particles of the fallen gunpowder go into the water treatment vessel. The remaining alcohol, solvent, etc. is then leached from the powder by circulation of water in a water treatment vessel and heating.

If this occurs, the water may need to be changed more than once.

The apparatus for carrying out the above method comprises at least one container connected at the bottom to at least one water inlet and provided with a drainage channel at the top to create an upward flow of water; It can be considered that the container is connected to a water treatment container through which the cleaned particles of gunpowder can be transferred.

A specific example of an apparatus for carrying out the method of the present invention will be explained below with reference to the drawings. FIG. 1 shows the apparatus, and FIGS. 2a and 2b each show a part of the container included in FIG. 1. FIG.

The apparatus shown in FIG. 1 is used to process explosives from which oversized and undersized particles have been removed by pre-sieving.

In FIG. 1, pretreated gunpowder is placed in a container 1.

The powder is pumped via an ejector 2 at the bottom of the container 1 into a container 3 contained in the device.

The above device also includes a water treatment container 4 located directly below the container 3.
The two containers 3 and 4 are joined by a connector in the form of a tapered pipe 5.

The container 3 is provided with an inlet 6 located at its upper part.
It is connected via a pipe 7 to the emitter 2 and to the container 1.

Further, the container 3 is provided with a discharge passage 8.

The water treatment vessel 4 is provided with a water intake 9 in its upper part, which is connected to a supply valve 10 for water.

The water treatment vessel 4 is also connected to a pump 11 and to a heat exchanger 12.

The heat exchanger 12 heats the water by means of steam in an inlet pipe 13 and an outlet pipe 14, respectively; the water is circulated by means of a pump in a pipe 15 from the lower part of the vessel 4 through the heat exchanger and back to the upper part of the vessel.

The container 4 is also provided with a drain pipe 16 at its bottom for discharging the water-treated gunpowder.

The container 4 is provided with a strainer (not shown in detail) at its lower portion, which prevents gunpowder from entering the pipe to the pump 11.

Water intake pipe 17 for clean water, connected to pipe 5
and 18, water is introduced by valve 19.

In the example shown in the figure, water intake pipe 1 with one above the other
With the water taken in by 7 and 18, an upward water flow is created by the pipe 5 and the spillway 8, and a vortex of the upward water flow thus obtained is created.

A drainage channel 8 of the container 3 is connected to a sludge trap 20.

The illustrated device functions in the following manner.

Containers 3 and 4 are filled with water and water intake pipes 17 and 1
When valve 19 for 8 is opened, an upward flow of water and the desired overflow is obtained.

The gunpowder is then discharged into the container 3, where it comes into contact with the water stream through which it falls, while at the same time the water stream separates excess graphite and gunpowder dust from the gunpowder particles.

The force of the water flow is therefore selected by means of the valve 19, so that impurities can be carried from above into the drain, while relatively heavy particles of gunpowder fall downwards through the pipe 5 into the water treatment vessel 4. You can enter.

When all the washed gunpowder has settled in the container 4, a water treatment is started with water in said container 4 to remove alcohols and other solvents that are partially or completely soluble in water. is circulated by a pump 11 via a heat exchanger 12.

The treated water can be carried out at different temperatures, for example 50.60 and 70 DEG C., and the treatment time can be selected between 6 and 24 hours at each temperature.

The water is exchanged when increasing the temperature respectively.

In special cases, other times and temperatures can be used, as well as water changes.

For example, for particularly thick-walled explosives, longer times and higher temperatures are recommended.

When the water treatment is finished, gunpowder, for example, is filled into a bag and transported for drying.

According to FIGS. 2a and 2b, the container 3 shown in FIG. A circular ring 21 comprising a bent plate is provided with four guide fins 22 extending from the outside of the ring, which are located on the extension of the diameter of the moving ring according to the recesses in the wall of the container; The insert is positioned to occupy the desired position.

In this case there are two inserts located on top of each other.

The purpose of the insert is to allow the ejected powder to settle rapidly in the container and to prevent the ejected powder from discharging directly into the discharge channel.

Separation of solvents partially or fully soluble in water, alcohol residues in the gunpowder, from the pretreated gunpowder by means of reducing burning rate and/or graphite as well as excess graphite and gunpowder dust resulting from the pretreatment. A method using the above-described apparatus for this purpose is to place the gunpowder in a container 3, where it is brought into contact with an upwardly directed stream of water, through which the gunpowder settles and is washed, while at the same time the separated impurities are carried upwards by the water stream. removal via conveyance drains, transfer of settled and washed gunpowder particles into water treatment vessels;
After that, remaining alcohol, solvent, etc. are removed from the gunpowder by circulating and heating water in a water treatment container.

Examples of the above method include in particular injecting the water and gunpowder together into the container 3 through an inlet placed in the upper part of the container 3, and in which the upwardly directed water stream is located between the containers 3 and 4. This involves conveying the water through a tapered passageway that causes the water to flow upwardly into a vortex.

The invention is not limited to the specific examples described above by way of example, but can be modified within the scope of the claims.

For example, the container 3 can be used next to a water treatment container, so that the cleaned gunpowder in the first-mentioned container can be transferred to the latter container by means of a pump or the like.

Similarly, a large number of water treatment containers are made separated from each other and the same container 3
A tapered portion 5 may also be provided.

[Brief explanation of drawings]

FIG. 1 shows an apparatus for carrying out the method of the invention; FIG. 2a
Figures 2b and 2b are a side view and a top view of a portion of the container included in Figure 1. 1 is a container, 2 is a discharger, 3 is a container, 4 is a water treatment container, 5
is a tapered pipe, 6 is an inlet, 7 is a pipe, 8 is a drain, 9 is a water intake, 10 is a valve, 11 is a pump, 12
16 is a heat exchanger, 16 is a valve, 19 is a valve, 20 is a sludge trap, 21 is a circular ring, and 22 is a guide fin.

Claims (1)

[Claims] 1 placing gunpowder in the upper part of the first container and directing a flow of water upwardly in the first container from an inlet in the lower part of the first container to a water outlet adjacent to the upper part; The upward flow rate of water in the container is controlled to cause undesired dust to flow upwardly and be discharged through the water outlet, while the desired explosive powder moves downwardly in the first container and exit. and transferring the gunpowder from the outlet of the first container to a second container, and keeping the gunpowder particles in the second container for a predetermined period of time, during which time the heated water passing through the second container is changed a plurality of times. A method for separating completely or partially water-soluble solvents and dust from gunpowder, characterized in that the gunpowder is treated with a gunpowder, the gunpowder is removed from the second container, and it is dried.