DE24105C - Dephosphorization process for iron stones - Google Patents

Description

IMPERIAL

PATENT OFFICE

The equipment required for the process is shown in longitudinal section in the drawing and basic riffs.

R is a cylindrical iron-stone roasting furnace of well-known construction, which stands on the four cast-iron pillars P in the middle of the round plate Pl . Above the edge of Pl is about the edge of the oven an acid line, which is made of earthenware or tubes from inside enamelled iron tubes sealed. Of this acid line four well-crafted Einleitsröhren lead s inside the roaster. A clay or enameled iron connecting pipe TT leads to the hydrochloric acid boiling apparatus Ka, which is set up under a roof next to the roasting furnace, through the nozzle 5 into the lid D of the hydrochloric acid kettle K. The hydrochloric acid kettle K is made of wrought iron, its inside is exquisitely enamelled and has a removable lid D. . This is beaded on the edge and engages in the angular, watertight riveted edge χ . This edge χ is filled with dry ash, whereby an airtight seal between the lid D and the kettle K is achieved; y are lid handles for easier removal of the lid when unscrewing 6 ¹ . Tv is the boiler fill valve; Sa ν is the acid drain valve. The hydrochloric acid boiling apparatus is walled in in a simple way, Z 'Z "Z'" indicates the direction of the fire to the chimney fox, which is also provided with a smoke slide; rr are cleaning openings for the furnace pulls. Tv is the inflow shut-off valve of the pipeline ro; all parts of the pipeline must be made of hard clay pipes or of well-enamelled iron. The valves or metal parts which come into contact with the acid are to be covered with enamel in an extremely solid manner, as otherwise the metal would be completely decomposed.

The new process is now as follows: After the roasting furnace R has been charged from above with iron stone and fuel containing phosphoric acid in layers and put into operation, the lower contents of the furnace will soon get red-hot. As soon as this condition is noted below, the hydrochloric acid-cooking apparatus comes into operation. The boiler K is tightly closed by the cover D , filled with hydrochloric acid through the filling valve Fv and the valve is closed; on the other hand, the shut-off valve Tv is opened and the furnace for the boiler K is put into operation. Because of the coals burning on the grate, the contents of the kettle will soon boil and hydrogen chloride gas will develop; the same rises and runs through T, Tv into the roasting furnace tube r ο and through its inlet tubes s into the glowing, roasted iron stone of R.

The chemical process can now be carried out as follows explain:

The one made in the roasting furnace with coals in a glowing state, containing phosphoric acid Iron stone is broken down by the glowing heat, while the carbon gives the phosphoric acid the oxygen takes and herewith forms carbon oxide gas.

The phosphorus remaining in the ores is released as soon as the Hydrogen chloride gas is carried out from the heated hydrochloric acid, through the chlorine, which as halogen has a predisposing effect, lifted from its connections. In the moment of becoming free the phosphorus combines with the hydrogen gas to form hydrogen phosphide gas, which from the upper opening of the roasting oven escapes and burns in the atmospheric air.

The chlorine combines with the iron to form chlorine iron.

Claims (1)

Patent claim: Process to dephosphorize iron stones during roasting with hydrochloric acid, whose in one Boilers produced vapors by means of nozzles or pipes in the lower part of a roasting shaft furnace inserted from the side or through the floor. For this purpose I sheet drawings.