DE278780C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 278780 CLASS 18 «. GROUP

Production of a special ore for pig iron production.

Patented in the German Empire on May 11, 1912.

When smelting powdery, pebbly ores with lumpy, chalky ores or from lumpy, pebbly ores with powdery, chalky ores or even when smelting Both ores in powdery form result in very unpleasant ones. Disturbances affecting the oven gear and have a very unfavorable effect on the iron yield and also on the coke consumption.

In the first and second cases mentioned,

ίο the falling cinder very irregular; A large part of the iron of the Ideseligen ore is slagged and forms something that is difficult to reduce Iron silicate, whereby the desired singular slag does not arise .. To the reduction of the Iron from the slag will require a new charge of fuel, and it will this makes it very difficult to achieve the correct iron quality. In most cases this slagged iron silicate is lost for pig iron production and migrates with the slag on the dump.

The untimely and irregular

- The formation of the singulosilicate slag reduces the efficiency of the furnace, and partly Slag that is too calcareous or too gravelly causes slopes and eruptions. The dust formation becomes irregular, high and, in addition to large iron losses, causes relocation of the ovens.

If calcareous and pebbly ores are smelted in powder form, the dust will still be formed much greater, and the abuses just mentioned are shown to be even greater, because it is very difficult for the furnace gases to get through the dust.

The present process aims to produce an artificial special ore for the Pig iron production, the smelting of which eliminates the abuses mentioned above. Inferior materials such as inferior minette, fine ore, Gout dust, iron sludge and the like, some known, some not yet described Process partially or completely processed and after removal of the excess part of the Lime of the chalky minette mixed, briquetted or agglomerated in such a ratio, that the end product forms an artificial ore, the composition of the gangue, in particular the ratio of lime and silica in the mixture is chosen so that when the ore is melted down, a singulosilicate slag is formed without further addition. It is known and has already proposed several times to burn inferior ores and then to be processed magnetically. Also the enrichment of inferior minettes with such Procedure has been proposed; but the practical exercise of this procedure is prohibited because of the high cost.

These disadvantages are eliminated by the following procedure:

The minettes consist of small, ferrous ones that can only be seen with the naked eye Oolites, connected by a calcareous, also clayey binder, sometimes with pebbly Admixtures are interspersed. Most of the phosphorus is bound to the Eisenoolith.

Tests have shown that the correct

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Roasting or burning of calcareous ores the binder naturally in oxide, mostly Lime oxide, is converted and quickly disintegrates into powder in the air.

The iron oliths, to which most of the phosphorus is bound, are exposed and can be separated from the binding agent by any method.
According to the present procedure, the

ίο chalky minettes either in pieces or burned in powder form and the burned material extinguished in water. This will Milk of lime is formed, and the granules of iron-olite, which are heavier, sink to the bottom.

The milk of lime can easily be decanted or removed in some other way and the Eisenoolith so for itself can be won alone.

On the other hand, you can remove hydrated lime from the burned and slaked mass and the remainder of the latter directly to incorporate the oolite so enriched Use alone or with the addition of gout dust, fine ore, etc. This is how it serves enriched ore at the same time beneficial for binding gout dust, ore mole, etc. With Advantageously, pebbly and calcareous, burnt, enriched ore are mixed in the ratio, that the end product gives the desired Möller.

The integration can be accelerated by the fact that the product with the exhaust gases of the Roasting ovens treated and dried, or that there is a short time under the action of the tensioned Exposed to steam.

The fine binders that easily react with hydrated lime play here as binders Silicic acid and alumina frameworks of the iron hydroxyoolithe bound to the iron Phosphoric acid and the iron silicocarbonate finely dispersed in raw ore play the main roles.

It is known to use hydrated lime as a binder

for ores to be installed and already proposed

■ to use some of the ores to incorporate other ferrous substances. According to the present Process should not be given an addition of more hydrated lime than that which the burned ore itself contains are, however, further burned or natural ore with the hydrated lime of the burned ore are incorporated, in the proportion that the incorporated mixture when remelted without any other additive, it produces a singulosilicate. Next is after this Procedure to remove part of its lime content from this highly calcareous ore, and indeed as much is withdrawn as there is more than that which is necessary for the formation of the desired singulosilicate slag is required.

Fuel and manganese ores and phosphorus-containing materials can be used at the same time the burned and extinguished ores are integrated. If you want a very rich end product, 'which one is special appears suitable for further shipment, the burned and quenched ores, after they are completely or partially separated from the milk of lime, on their own or with The substances to be used are converted into solid form by high temperature.

A large part of the iron compound is already formed by burning the calcareous minettes converted into metallic iron by reducing gases in the fuel.

The: burned product already contains around 30 percent of the iron in metallic form. If this mass, freed from most of its lime content, becomes a pebbly one Minette mixed together in such proportions that the gait of both was a singulosilicate slag can form, and this mixture is sintered in a reduction zone, this occurs even at a relatively low temperature (between 600 and 800 ° C) rapid reduction of the easily reducible ferrous oliths, which is almost complete before the sintering temperature of the silicate slag has been reached.

It is. to observe that the reducing gases are as hot as possible, that oxidizing agents are kept away, and that free air does not come into direct contact with the sintered material. This is already achieved by adding coal dust to the ore mixture. The very solid clinker obtained in this way contains the reduced iron grains sprinkled in as such. Such sintered mass contains at a total iron content of 40 percent up to ^{_2/3 of} metallic iron; The metallic iron content is rarely below 15 percent.

Claims (3)

Patent-to sayings: 1. Production of a special ore for pig iron production, characterized in that that calcareous minette or calcareous ores containing eisenoolite are burned and possibly after previous removal of part of the resulting hydrated lime with siliceous Minette or other pebbly ores 0. mixed in such a ratio and briquetted according to known methods, that the remaining gangue creates a singulosilicate slag, with manganese ore and fuel if necessary can be added to the ore mixture. 2. Production of a special ore according to claim 1, characterized in that part of the excess lime content of the raw ore after roasting with water washed out and siliceous and the enriched chalky minette can be incorporated at the same time. 3. Production of a special ore according to claims 1 and 2, characterized in that that the ores mentioned there after that described there. Preparation by heating be converted with carbon or other reducing agents into a mass that contains a lot of reduced iron, avoiding slagging of the iron.