FI61466C - ANORDING FOER ATT FRAON KRUTKORN AVLAEGSNA OEVERSKOTTSGRAFIT OCH VID YTBEHANDLINGEN UPPKOMMET KRUTDAMM - Google Patents

Description

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Patent- och rafiatorstyralaan 7 Anattku uttetd och utUkriftwi pubik «r * d. uu. oä (32) (33) (31) W «y Äuelkeu * —Begird prtorttat 20.09.73 Sweden-Sweden (SE) 7312798-7 (71) AB Bofors, S-69O 20 Bofors, Sweden-Sweden (SE) (72) ) Lars-Erik Björn, Karlskoga, Mats Jurgen Martin Olsson, Karlskoga, Sweden-Sverige (SE) (7U) Berggren Oy Ab (5U) Device for the removal of excess graphite and gunpowder from surface treatment vid ytbehandlingen uppkommet krutdamm

The present invention relates to an apparatus for removing excess graphite and surface-generated gunpowder from rate-of-burning agents and / or graphite-treated gunpowder and for dissolving (washing out) residues of alcohol and / or other fully or partially water-soluble solvents.

In this context, it has previously been proposed e.g. that the alcohol be removed from the moist, surface-treated powder by first placing it after bagging in wooden, open or covered tin vats and then filling these with water which is heated by steam or recirculated through a heat exchanger. Such treatment with water is usually carried out at three different temperatures (50, 60 and 70 ° C) and at intervals of six to 2 hours for each temperature, depending on the type of powder. Especially when the large vats are open, the study becomes very humid and warm, and if, moreover, nitroglycerin-containing powder is treated, the study becomes even more uncomfortable.

After treatment with water, the powder is dried in special drying rooms at about 50 ° C, and 2,61466 of the powder bags are transported from the drying rooms for further sieving. Post-sieving is performed with flat sieves or other sieves in which graphite, powder grinding powder and oversized and undersized granules are removed. This is a very dangerous process because the powder at this stage is dry and the sieve in question always includes some sort of moving parts. The post-sieved powder is then transferred for further mixing.

The object of the present invention is to provide a device by means of which said method can be simplified and handling made safer and more pleasant for personnel. The device according to the invention is characterized in that it consists of an upper water-filled tank for feeding powder and a lower water-filled tank for soaking solvent from the powder in a manner known per se, and a narrower connection connecting these tanks provided with one or more water inlets for supplying upstream water. the tank being provided with an overflow channel to remove excess water and fine particles detached from the powder grains, while the lower tank is provided not only with a pre-treated powder outlet but also with a soaking water inlet and an outlet line for circulating a predetermined temperature of soaking water.

The device according to the invention preferably treats powder which has been pre-treated once or more at that stage of the process in which there is still solvents left in the powder, so that the powder, when possibly ignited, burns slowly and goes out easily. In this case, the oversized and undersized granules are removed, leaving only the separation of powder dust and excess graphite and alcohol due to the surface treatment.

When using the device according to the invention, the gunpowder is suitably transferred to a tank (vessel), for example as an aqueous suspension, which is pumped to the top of the tank where it is brought into contact with an upward water stream through which the gunpowder falls and is cleaned, while separated contaminants pass upwards , the falling, cleaned powder granules enter or are transferred to the water treatment tank, and the remaining alcohol, solvent, etc. are then soaked out of the powder by recycling and heating the water in the water treatment tank. In certain cases, it may be necessary to change this water once or several times.

An embodiment of a device with the features of the invention will now be described with reference to the accompanying drawing, in which Figure 1 shows the device in question in a vertical view and Figures 2a and 2b in Figure 61466 show a horizontal and vertical view and a partial section of the container of Figure 1.

According to the above, the device according to Fig. 1 is intended for the treatment of pre-screened powder, from which the oversized and under-large granules have been removed during pre-screening. In Figure 1, the surface-treated powder is loaded into a container 1. This powder is intended to be pumped by an ejector 2 at the bottom of the container 1 into a tank 3 according to the invention. The device also includes a water treatment tank 4 located directly below the tank 3, and the tanks 3 and 4 The tank 3 is provided on the one hand with an inlet pipe 6 arranged at its top, which communicates with said ejector 2 and the container 1 along the line 7, on the other hand with an overflow 8. The water treatment tank 4 has a water inlet pipe 9 with a water filling valve 10. 11 and heat exchangers 12, which, by means of steam passing through the inlet pipe 13 and the outlet pipe 14, heats the water circulated by the pump 11 down the pipe 15 from the lower part of the tank 4 through the heat exchanger and back to the upper part of the tank. The tank 4 is also provided with a bottom drain valve 16 for discharging the water-treated powder. The lower part of the tank 4 has a screen (not shown) which prevents gunpowder from entering the air pipe of the pump 11.

Connected to the pipe 5 are two inlet pipes 17 and 18 for clean water, which is discharged through the valve 19. By introducing water along the inlet pipes 17 and 18, which in this embodiment are superimposed, both an upward flow of water through the pipe 5 and the overflow 8 and a turbulence in the upward flow of water thus obtained are obtained.

The overflow 8 of the tank 3 communicates with the sludge trap 20.

The device shown works as follows. Tanks 3 and 4 are required to be filled with water and likewise the valve 19 of the inlet lines 17 and 18 is required to be open so that the desired upward, turbulent flow of water is in progress. The powder is now ejected into a tank 3, where it comes into contact with said water stream and falls through it, while the water stream separates the excess graphite and powder dust from the powder granules. The intensity of the water flow is then selected by means of the valve 19 in such a way that it is able to convey the pollutants in question upwards overflow 1 * 3 * :. f 4 f, 1 Δ 6 6 per mouth, but allowing the relatively heavy powder granules to fall down the pipe 5 into the water treatment tank;

When all the powder has thus been washed into the tank 4, the water treatment is started to remove alcohol and other solvents completely or partially soluble in water by circulating the water in the tank 4 through a heat exchanger 12 by means of a pump 11. The water treatment can be carried out at several different temperatures, e.g. 50, 60 and 70 ° C, whereby the treatment time at each temperature can be selected between 6 and 2 hours. When raising the temperature, always change the water. In special cases, other durations, temperatures and either fewer or more water changes can be used. In the case of a particularly thick-walled powder, for example, it may be appropriate to extend the relevant time and increase the relevant temperature. At the end of the aqueous treatment, the powder can, for example, be bagged and transported for further drying.

! According to Figures 2a and 2b, the container 3 of Figure 1 is provided with additional inserts 6 arranged inside the container, at the inlet opening 6, each extension comprising a plate bent into a circular ring 21 and provided with four guide vanes 22 projecting from the outside of the ring into the radius so that the attachments remain in the desired position. The number of add-ons in this case is two and they are superimposed. The purpose of the attachments is to make the injected powder quickly sink into the tank and to prevent the injected powder from escaping immediately through the upper stream 8.

The invention is not limited to the embodiments exemplified above, but may be modified within the scope of the appended claims. Thus, for example, the tank 3 can be arranged next to the pretreatment tank, whereby the powder washed clean in the former tank is transferred to the latter tank by a pump or the like. Likewise, several water treatment tanks can be arranged next to each other and to the same tank 3 with a narrower part 5.