DE1508423B2 - Process for the production of protective gas for metallurgical purposes - Google Patents

Description

1 sheet of drawings

Claims (1)

1 2 The invention relates to a method for pressurized argon or nitrogen Position of protective gas for metallurgical purposes, the gases then being introduced into the liquid from argon and / or nitrogen and reducing argon or in which nitrogen goes into solution. It Gases, in particular to prevent acid, it has been shown that, for example, with a pressure substance access to liquid metal melts or high 5 of 15 atmospheres approx. 3% hydrogen in liquid argon heated metals. The protective gas comes out mainly soluble. Mainly when annealing sheet metal, strips, pipes, when removing the protective gas from the liquid zone Semi-finished products and the like, as well as during welding and soldering of the pressure vessel, the pressure drops accordingly of metallic workpieces for use. Removal from, and thereby also the solubility For this purpose, a so-called ίο of hydrogen, carbon monoxide or the like is already used. "Forming gas" is used, which is made up of a mixture of fluctuations in the pressure above the liquid consists of nitrogen and hydrogen. The water lead to segregation analogous to the distillate material has the task of dealing with the processes possibly known in the tion of two-substance mixtures, Surroundings of the heated or liquid metal, if they consist of components with very different hands To bind oxygen and the emergence of 15 borrowed boiling points exist. Forcing one out of it To oppose oxides in the slag or in the metal, as it is in an advantageous further development of the hinder. The well-known forming gas is provided in steel, the pressure is constant over a bottle delivered, which is a reducing valve placed at higher consumption, to which a small high line Relatively high transport costs, which are associated with the lower-boiling Eompo and because of the ballast weight of the high pressure 20 nent, z. B. hydrogen is filled, connected Steel cylinders requires significant investment. is, the content of hydrogen remains in the The object of the invention is therefore to keep an inert gas mixture almost constant, and you have almost to create that in the aggregate state of highest density all phases of the extraction one for reducing can be fed to the consumer, so that the annealing can be used argon or usable Transport problem not a decisive role 25 Nitrogen. It is still a good idea to keep the container plays. To solve this problem, according to the with the high pressure gas bottle as a transportable Invention to form a liquid protective gas constant together- unit so that the empty container in the Composition by mixing and dissolving the redu- Oxygen plant filled up and; then to the consumer ornamental gases can be transported in liquid argon and / or liquid, .., Nitrogen is formed, temporarily stored and used. The drawing shows a "" system for generating it steams. The protective gas according to the invention, composed of several components, is shown schematically . The protective gas that has been set is thus presented to the consumer in liquid form. sigem condition and delivered with this in a The transportable pressure tank 1 with the liquid Evaporator converted into a gaseous state. Mixture, e.g. B. argon / hydrogen, is available over the As reducing gases, hydrogen, carbon shut-off valve 2 can be connected to the evaporator 3, monoxide or low-boiling hydrocarbons or at 4 the gaseous protective gas is used Mixtures of these gases come into consideration. taken during metallurgical processes. At the It is already known to reduce the transport costs because the pressure tank 1 is the high pressure gas bottle 5 by bringing a protective gas from the ammonia which is liquefied through a reducing valve 6 and wins hydrogen. This method is neither for the entry at the bottom of the tank 1 into the liquid argon for regulating the mixture con-S in the magazine "Gas — Wärme", 1957, Issue 9. 287 to 297, on p. 292. In the case of this centration, or through entry into the process known from steam, only the outlet dome of the tank 1 is present to maintain a constoff ammonia in liquid form. In the case of ammo-stant pressure in the same, depending on the niac acid, it is a chemical disposition, however, whether the valve 7 or 8 is opened,
bond that is unusable as a protective gas. It is " ...
therefore an extensive chemical-physical patent claims:
Process necessary to obtain the actual protective gas. 1. Process for the production of protective gas, which is then present as a gas and can also be stored in this form for metallurgical purposes, from argon and / or stick. The 50 substance and reducing gases, characterized by chemical-physical process, consists in the fact that the characterizes that a liquid protective gas, liquid starting material ammonia, first evaporates by mixing and catalytically in nitrogen and hydrogen in the dissolving and dissolving of the reducing gases in the liquid container 25 : 75 must be split. Then argon and / or liquid nitrogen is formed, during a partial combustion, around which the large amount of water is stored and evaporated,
to degrade the proportion of substance. The resulting water 2. device for carrying out the evaporation must be removed by deep freezing or absorption driving according to claim%, consisting of a drying. Such a large storage container for liquid argon and / or process can only be carried out in a stationary system through liquid nitrogen, a pressure bottle for the. On the other hand, it is an advantage of the invention reducing gases and an evaporator, that the production of the protective gas is characterized in that the pressure bottle (5) is liquid phase in a transportable system via a valve (8) with the vapor space which can follow. A storage of the finished protective storage container (1) and a further gas in liquid form is not possible with the known valve (7) with the liquid gas of the storage method. 65 container (1) is connected. For the production of the liquid protective gas according to 3. Device according to claim 2, characterized in of the invention are expediently the redu- denotes that the storage container (1) with the ornamental gases in a container with liquefied pressure bottle (5) forms a transportable unit.