DE418138C - Method of making steel by wind refining - Google Patents

Description

Process for the production of steel by wind freshening, The. The invention relates to a new method for the production of steel with simultaneous ger formation of nitrogen compounds. especially especially of cyanogen compounds. It is known (-in bath of gescliniolzciieni Metal, e.g. ß. Iron, to be seeded with 1,7-olilene and at the same time-- nitrogen together tillt metallic steaming. - e.g. ß. Sodium- steam to be introduced into the molten mass ren. This is nitrogen through its Affinity for carbon in the presence of a catalyst, such as. B. an alkali metal bound.

The present process uses this reaction to produce Steel, whereby cyano compounds are formed and obtained as valuable by-products will. The process is valuable for the extraction of iron from ores, which have a larger percentage of sulfur or phosphorus, which is usually the Production of steel by the Bessemer process was not permitted.

In one embodiment of the method, the usual Bessemer pear rotatably mounted on pegs with a refractory lining is used. The bottom of the pear contains, as usual, the air hammer, which communicates with the pear interior through a large number of nozzles. The molten pig iron is introduced into the pear in a known manner and exposed to a sharp stream of air therein, which removes the foreign constituents, such as. B. silicon, completely or substantially completely removed. Since, as is well known, the reaction between the silicon and the oxygen in the air is highly esothermic. thus a significant degree of heat is generated during the oxidation of the silicon. which the 'T - further increased mperature of #re molten iron and the II - encourages incoming reactions. The air flow is only turned on for a short time in order to remove the silicon: then the further flow of compressed air is shut off, while the air chamber in the bottom of the pear is filled with nitrogen kept under sufficient pressure, which is similar to the Compressed air enters the molten iron mass through the nozzles at the bottom of the pear. At the same time, an alkali metal, such as -z. B. sodium, incorporated into the iron bath, the alkali supporting the action of the nitrogen blown into the pear. Here, the alkali also combines with the sulfur and phosphorus still in the iron bath, and compounds with these elements which can easily be removed from the iron bath.

The Alkalinictall also serves to. the reaction between carbon and stickstop to accelerate the formation of the cyan bonds.

The 'asfoi'illigcil I: rzeu-nisac 11' @ rclcn formed in the reaction of the Sickstottes are transferred from the pear through cooled pipes or chambers to washing doors. 11'o they are treated finitely with water or other solvents. to win the greatest cyam connections. To facilitate the separation and the gains in the reaction of the nitrogen obtained in the form of I: rzcu7ni5; e zti. is either the binia with provided with a hood, which with the lZülil- Katnnlern is connected,. and the so is shaped that during the first B1as- periodr 1111t gases generated by compressed air to be able to work while it is being closed, when nitrogen blowing starts. to The pear can also be rotated for the same purpose so anl; rordnot. that during the air gas-filled products blow easily can fall apart, while the next following 131aseti with nitrogen the pear so it is pressed that she is doing this with her upper End under a hood or the like. Which the formed cyano compounds in the cooling chambers directs, where they in itself l) ckailnte'r Way can be obtained. - To introduce the alkali metal into the pear ren, you can z. B. use a container, 11-elchcr is attached to the side of the pear and with the blower or the nozzles in the floor connected to the pear. The heat iti the I3ii'nc # prevails. is sufficient to remove the alkali to liquefy metal and through the nozzles with the iron bath of tunen in connection zti brinycn. whereupon it immediately in Datnpfforincn transforms. . For the preliminary procedure, it is nu äßie, - pure nitrogen. as he did at the ilU @ Signn "v an Luft crlialtcn is used. The nitrogen combines quickly with your graphite carbon and with the to the iron-bound carbon below Formation of ('yativebindingcti. A second execution of the procedure is in it. dal2) min not nitrogen alone, but ü; @cnclcm used. whose Ingredients- sticks: off and '\ @' are asserstoli, and welc'lics in the second I ';: riode in the Besscmcr-13ii'nc cin "is introduced. which the "- (, formed gaseous ores also cooled and through '\ @' asclitürnie durcligelcitct, uni the cyan or the cyan connections in the manner described above to inherit. however, an alkali in metal to support the reaction beef-just ii-earth: n, since the alkali y connects I) ci high temperature in the near future of carbon monoxide and oleic acid decompose put tnld kc) form llensic acid salts. Will however, a gas mixture is used in which no liolilc # iinionoxvd and no: carbonic acid are released. so can the alkaline; all to It supports! N @ the Cvan cr @ cl) cndcn reaction uses %% - earth. In the Iwilirgend drawing, there is an illustration of the device 11'iedergc # geli;: n, which is used to carry out the procedure; each- but the individual parts, like the I3esse- incr-Ilii'nc, the gas pipeline and the ZVasch- tnrnl. s (eg.eben me -lienlatisch to g. 1) ic 13e @ scnlcr-Birnc i consists of the \ fe- tall jacket 2 internally provided with a refractory coating 3 and externally provided with pivot pins 4 and 5 capable of rotating in the bearings 6 and 7 of the frame, each of which is supported by a suitable frame 8.

The pear is provided with the usual mouth, while the Nozzles r i at the bottom of the bulb are in communication with the gas line 12. The warehouse 6 has a bore 14, which on the one hand with the gas line, on the other hand with the Hole in the pin of the pear connected; the tube 16 is directly on the bearing 6 connected and is connected to the bore i ¢ and the channel i 5 in the pin ¢.

A pipe 17 connects the channel 1 5 of the pin 4 with the line i :! in the bottom of the pear. A container 18 can be brought into connection with the bottom of the pear or with the line 17. The container i8 is used to hold the alkali metal and is provided with a removable lid i9; on the ground it receives a short pipe socket 2o which connects it to the pipe 17. If necessary, pressure means can be provided by means of which the alkali metal is forced out of the container 18 into the connecting line 17. The bearing 7 is provided with a bore 2i which is in communication with the interior thereof, but also a pin 5 with a channel 22, while the nitrogen or air is supplied through the line 24 which opens into the bearing 7 . The parts and lines mentioned are completely -leidli to those on the other side of the pear. The line 26 connects the channel 22- finite the line 12 in the bottom of the pear. Suitable stuffing boxes can be provided in the bearings 6 and 7 in order to seal the lines 16, 17 and the lines z4 and 26.

A hood 27 is connected to the tube 28, which by means of a joint 29 is connected to the fixed pipe 3o, so that thereby the hood can be brought over the mouthpiece io of the pear to the emerging from the pear absorb gaseous products.

The line 3o enters the bottom of the washing tower 31 to the gases to feed from_ the pear into the washing tower, where it meets with reagents, which are introduced through the line 32 from above into the washroom and one To effect washing of the gases, while the reagents through line 33 again exit the tower. The line 33 serves to discharge the gaseous products after treatment in the - \ V ash tower and for transfer to a second tower or for further processing elsewhere.

After the pear is filled with melted Lisen, it becomes air introduced through line 24 and blowing continued until the silicon of the iron has completely or largely disappeared. During this treatment by means of compressed air, the hood 27 is raised to allow the gases emanating from the bulb rise to secure the exit. After this period of blowing is over. will the further air supply through the line 24 is shut off and instead of air now Introduced nitrogen under pressure. Immediately at the start of the nitrogen supply or soon afterwards there will be the products of the combination of nitrogen emerge with the carbon content of the metal. and then the hood 27 lowered so that the bulb is closed, and the new gaseous products are through the line 3o, after they are sufficiently cooled, at the bottom of the tower 31 introduced. If nitrogen is used alone, the required Amount of alkali in the container 18 through the nozzle 2o, the pipeline 17 and 12 as well as the nozzles i i inserted into the bulb.

Claims (2)

PATCNT CLAIMS: r method of producing steel by wind freshening finite air and towards the end of the blowing with nitrogen, characterized in that the molten iron is exposed to the action of a current of air for so long until the silicon is completely or substantially removed, and that then the Air flow is interrupted and nitrogen is passed through, which with the carbon Cyan and cyano compounds, which form in a manner known per se from the withdrawing Gases can be obtained. 2. The method according to claim i, characterized in that that basic substances are introduced during the sparging of nitrogen.