DE246082C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 246082 CLASS 18 «. GROUP

in HAREN B. BRUSSELS.

ore already heated.

Patented in the German Empire on October 23, 1910.

The invention relates to a method for agglomerating powdery iron and manganese ores at high temperature in a rotary kiln, with the ores in the Form of porous masses are transferred, which then form an ore, its physical and chemical properties of the later transformation into metal after the ordinary metallurgical processes are particularly favorable

ίο are. ;

The previously known methods for agglomerating these ores in rotary kilns bring with them evils which have resulted in their being rejected by experts. Since the agglomeration was achieved by softening the load to the consistency of the pond, the result was a glazed, dense product that was impermeable to the gases that are to serve as reducing agents in further metallurgical processing. In addition, the high temperature has the consequence that the treated oxides are all converted into the oxyduloxides (Fe ₃ O ₄ , Mn ₃ O ₄ ) , which are the most stable and the most difficult to reduce.

On the other hand, the doughy state of the Oxydic masses makes them very reactive, so that they can easily attack the refractory lining of the stove. From this follows a lot quickly an approach that clogs the furnace after a short period of operation and leads to an interruption of the company.

The method described below is free from these various inconveniences. It aims in the individual pieces of the clumped together. Ore has a porous structure caused by the development of gas within the mass that is being agglomerated is caused, which just emanates from the points that the center points .for the Form agglomeration of the particles.

In the process, the oxyduloxides generated by the high temperature are in oxygen-poor compounds transferred, which are in the later metallurgical treatment can be reduced more easily.

Finally, the process avoids the formation of one approach by removing the last Increase in temperature, which is necessary to cause sintering, in points inside the mass itself rather than the whole.

This purpose is achieved by regulating the heating of the charge that this is brought to a temperature slightly below that at which the sintering begins, what exactly is the point where the charging the highest temperature reached, coal in

(2nd edition », issued on February 26th igi4->

Claims (2)

the feed flings which coal is incorporated into the feed as a result of the rotation of the furnace. The combustion of these coal particles causes a local increase in temperature, which agglomerates the oxides around the melting centers, at the same time reducing the oxidation level and generating gas development, which entails the penetration of pores or bubbles in the pieces thus formed. Since the centers of sintering are immediately enveloped by the ore and therefore there is no contact between the refractory furnace lining and the melting particles, and since the chemical reaction between oxides and fuel causes a cooling at the expense of the heat content of the mass, a Baking of the sintered mass on the furnace lining avoided. In contrast to other processes in which the ores treated in the rotary kiln are acted on with solid or gaseous fuel, the present process requires, if the effects described are to occur, that the fuel be in solid form at a point precisely determined by the temperature of the charge is thrown into this, a point that can change during operation depending on the irregularities inherent in the heater and depending on the displacement of the feed. For if the fuel reaches the ore at a point where it is not yet hot enough, it will be consumed before the temperature necessary for sintering has been reached; it will have no effect on the structure of the pieces, and the agglomeration will be as with the usual. Procedure must be done by sintering the entire mass. When the fuel reaches the ore after the agglomeration has begun, the approach has already had an opportunity to form, and the gases evolved by the fuel, which develop in the midst of the already large pieces, can affect them with respect to the structure have no effect. Subsequent treatment of ores in the rotary kiln, i. H. after the ore has already passed through part of the furnace to add fuel is known per se. Such a method is e.g. B. has been used in the representation of sponge iron in the rotary kiln, where the addition of coal had the purpose of promoting dephosphorization. The drawing shows in the form of an exemplary embodiment a device for carrying out the process. Α is the rotary kiln, b a burner for pulverized coal or any other fuel, c a device that throws fuel at the point where the temperature of the charge contains this additive makes necessary. The throwing distance can be regulated as required by changing the rotational speed of the device c. Apparently the device shown can be replaced by any other device that fulfills the same purpose. Patent-Α ν proverbs: 1. Process for agglomeration of powdered ores, in particular iron and Manganese ores, in the rotary kiln with the addition of coal to the already heated one Ore, characterized in that at the point where the sintering temperature is almost reached, a fuel is introduced, for the purpose of a sintering center with each fuel grain to build. 2. embodiment of the method according to claim 1, characterized in that the fuel is introduced through the lower end of the rotary kiln. 1 sheet of drawings.