DEP0017801DA - Extraction of pure iron oxides or of iron and steel - Google Patents

Description

DR. ING. F. WESTHOFF
DB. F. WUESTtIOFF
PATENT LAWYERS
^ Munich 9 ^

Besohreibuftg xu the Pal; ent aniaeldung Kara von Haken _$ Mwcmu

"concerning

^c T * ^ q * aPM yo »pure ,, ^ senoxides or from Elsen and 3tahl

It is already known that Kireeke extraction of clay, steel and sintered iron, pre-crushed sieves such as mmatite, la * iron iron or brown iron ^ e at temperatures around 400 °, the products obtained in the racing furnace laagnetieoh © neureichem and here? at high temperatures of 1000 ° with constant movement to convert them into metallic sieves. Ee is also known, sis carbide in powder form he adds finely divided waiassunder at temperatures around 900 ° · with the release of CO, etc. Convert CO ₂ into irelohen iron pigeon. These known processes, applied to low-iron ores, have the disadvantage that, at the high temperatures required for the material reduction, certain sintered products are formed, as well as iron oxide compounds formed during the reduction of the iron and silicates present in the iron.

1® has now been found that high (up to 9 ?? S) yields of pure magnetite are obtained when crushed «* Erss

In Biehrerea StTtfea Torrediaziert _f thus RoBtf treatment - and Hediafcttoa Tsei Semperatxiren below 500 ° a with subsequent grinding and magnetic separation repeated * where- "C - FgO ^ present in the Sre first in the magnetic γ -modification and subsequently in a mixture This is followed by the use of high-quality fuel (gas or coke) at temperatures below 1000 °, preferably at temperatures of 600 to 720 °, to iron or iron carbide. As the last phase of treatment This is followed by the low oxygenation of the iron carbide obtained by means of iron oxides to iron in the manner indicated as known. ”During the course of the process, quantities of phosphoric acid and sulfur set free are bound by the addition of lime, the amount of lime to be added in each individual case Case must be determined »

Example 1 . 3 to crushed to about 1 mm grain size Brauneis enerz with a © ehalt of about 33 iron are heated using waste heat with sawdust to about 400 ° C, finely crushed become brittle by the treatment "ore and magnetic separation that by this pre-reduction gained - magnetic - Pe ^ separated from the gait. The separated magnetic components are heated to a temperature which is about 50 ° higher than the first time, with additional small amounts of wood chips added, then ground again (with a particle size of 0.2 to 0 being given) and separated. The one after the first treatment

The remaining residue was also subjected to repeated ESst and Eediaktionsbeliandlwig at a higher temperature than the first reduction, so _long until an iron oxy dust of high unity was obtained. Me Eieenoxyde obtained _f SiOg their content is less than 0.3 $ is to be naohreduziert with coke breeze or generator gas at from 750 to 900 ° increasing temperature in a very short time to Pe. The resulting iron carbides are processed into metallic iron in the well-known catfish.

Example 2 . 40 kg of iron-poor β ore (20 to 2% iron) is ground to a grain size of 1.5 ram, 0.65 kg of lignite dust is added and treated at temperatures around 450 ° in the Helzgaeetrom for about 3 minutes, as higher temperatures cause the feldspar-containing mountains to become slippery can "lead" The Behandlungegut is then cooled in air exclusion under IOO ^0, crushed and magnetically separated under constant turbulence. The remaining, dark red colored residues still contain up to 10 $ eggs, which is why it is carefully reduced further at 450 ° and separated again magnetically. The color of the mountains ¹¹ is yellow after the deposition. Analysis of the magnetic concentrate, according to Reduktioa, shows about 67 $ Elsen.

A sample of it sinters at approx. 630 ° and becomes completely non-magnetic due _{to the excessively high SiO 2 content.}

The magnetic Eona eitrat is mixed with large quartz lirooks and with pure Isei fuel approx. 500 ° further reduced. Btr Fe ^ O ^ -content rises to about 98 Isis 99 ## while the gel-colored residues are coarse on the dome Collect silicate * The concentrate can be reduced to about half a level at approx. 720 ° with CO-containing gas reduce to iron. The carbon remaining at the end of this "cold" reduction must have been caused by oxidation, for example with the admixture of enough Fe ^ and, if necessary, with the help of this reaction accelerating agent Hydrogen.

The method of the invention allows the obtainment of very pure iron in a high yield under stress by little time and low (about ^2/6 of the far in the blast furnace

e grain size dee

its use in the manufacture of magnetograms.

Claims

Claims (1)

Pateatansiaraoiie I _e method of obtaining clay from pure egg powder or sintered iron Ijsw ₄ pure iron oxides from ores or outline bisene oxides' by gate reduction of the earth "at low temperatures, for example of 520 ° C and Kaehreduktioa of the magnetically separated pure iron oxides obtained in the Yorreduction, characterized in that the gate reduction together with the magnetic separation carried out several times and the reduction to pure bending powder or sintered iron is carried out with detaperatures below about 1,000 °. 2 * Method according to claim 1, characterized in that that both in the pre-reduction and in the Kachreduktion hydrogen passed through the heated mass wlrä. 3. The method according to claims 1 and 2, characterized in that in the pre-reduction and optionally Small amounts of alkaline earths, e.g. lime, are added to the laughing reduction. 4. The method according to claims 1 to 3, characterized in that some of the iron oxides in the ITachreduction is converted into sis carbide by excess carbon and then the carbide with the pure magnetic Iron oxide is converted to iron or steel.