KR101191964B1 - Apparatus for producing carbon composite metal oxide briquette - Google Patents

Abstract

The carbonaceous material hopper for storing coal raw materials, the ore hopper for storing ore raw materials, the binder tank for storing binders, the carbonaceous material hopper and ore hopper, A mixer connected to the binder tank to mix the conveyed coal with the ore and the binder, a molding machine connected to the mixer to agglomerate the mixture mixed in the mixer to produce a compacted light, and heating to fire the compacted light connected to the molding machine Provided is a carbon material-embedded compacted light manufacturing apparatus including a furnace.

Description

Coal materials built-in compacted minerals manufacturing equipment {APPARATUS FOR PRODUCING CARBON COMPOSITE METAL OXIDE BRIQUETTE}

The present invention relates to an apparatus for producing blast furnace raw materials in a steelmaking process. More specifically, the present invention relates to a carbonaceous material-containing compacted light manufacturing apparatus for compacting ores and coal together.

In general, a number of methods for simultaneously compacting ore and coal have been proposed in order to improve reaction efficiency of raw materials in a blast furnace raw material manufacturing process.

In order to manufacture coal-bearing compacted ore, coal and ore containing a large amount of fine particles are mixed with a binder in a mixer to make a mixture, and the mixture is compacted by compression molding with a briquette machine.

Recently, a technique for producing briquettes using coal as a binder in the manufacture of compacted ore has been developed and used.

However, conventionally, when coal is used as a binder, there is a problem in that a process of manufacturing carbonaceous agglomerated ore is very complicated. That is, in order to use conventional coal as a binder, the fluidity of the coal must be secured, and for this purpose, the coal is heated to 300 to 400 ° C. to ensure fluidity. As described above, the conventional structure is manufactured as a briquette through the hot forming process after the raw material is primarily heated and mixed. And the manufactured briquette is subjected to a heat treatment process which is reheated to 600 ℃ again.

Therefore, in the conventional structure, the heating process is performed several times, which makes the process very complicated. When the initial heating of coal and ore, which is a raw material, becomes difficult, mixing of ore and coal becomes difficult due to softening and melting characteristics of coal. .

Accordingly, there is provided an apparatus for manufacturing a carbon material-containing agglomerated mineral which is capable of sufficiently securing the room temperature strength and the hot strength of the briquette while simplifying the manufacturing process.

To this end, the present apparatus comprises a coal ash hopper for storing coal raw materials, an ore hopper for storing ore raw materials, a binder tank for storing a binder, and coal and ore and binders connected to the coal ash hopper and ore hopper and a binder tank. And a molding machine connected to the mixer to agglomerate the mixture mixed in the mixer to produce compacted light, and a heating furnace for firing the compacted light connected to the molding machine.

The dryer may further include a dryer installed between the carbon material hopper and the mixer to dry coal transferred to the mixer.

The dryer may further include a dryer installed between the ore hopper and the mixer to dry the ore transferred to the mixer.

The display unit may further include a screen unit connected to the heating furnace to remove powder components from the compacted light discharged from the heating furnace.

Is installed in the heating furnace may further include an air supply for supplying air into the heating furnace.

The binder may be an organic binder.

The heating furnace may be made of a rotary kiln.

The heating furnace may be a structure for heating the compacted light to 300 ~ 700 ℃.

As described above, according to the present embodiment, it is possible to manufacture carbonaceous agglomerated ore having excellent quality.

In addition, by simplifying the process it is possible to easily minimize the manufacturing cost and to reduce the reducing agent ratio when the blast furnace is applied.

1 is a schematic configuration diagram showing an apparatus for manufacturing carbon material-embedded compacted light according to the present embodiment.
Figure 2 is a graph showing the experimental results of the room temperature intensity of the carbonaceous material-containing compacted light produced by the manufacturing apparatus according to this embodiment.
3 and 4 are graphs showing the experimental results of the hot strength of the carbonaceous-containing compacted ore manufactured through the manufacturing process according to the present embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. As can be easily understood by those skilled in the art, the embodiments described below may be modified in various forms without departing from the concept and scope of the present invention. Where possible the same or similar parts are represented with the same reference numerals in the drawings.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

1 shows a carbonaceous material-containing compacted light manufacturing apparatus according to the present embodiment.

As shown, the apparatus includes a coal ash hopper 10 for storing coal raw material, an ore hopper 12 for storing ore raw material, a binder tank 14 for storing a binder, the coal ash hopper 10 and an ore hopper. (12) and a mixer 20 connected to the binder tank 14 to mix coal, ore and binder, and a molding machine connected to the mixer 20 to form a mixed light by molding the mixture mixed in the mixer 20 ( 30) and a heating furnace 40 for firing the compacted light is connected to the molding machine 30.

The ore is pretreated to a particle size of 5 mm or less. For example, the ore is separated by particle using a crusher and a particle size separator. The ore of the selected set size is stored and prepared in the ore hopper 12.

The coal raw material is also crushed using a crusher to sort the pulverized coal having a particle size of 5 mm or more through a particle size separator, and the pulverized coal having a particle size of 5 mm or less is stored and prepared in the coal ash hopper 10.

In addition, a dryer 16 is installed between the carbonaceous material hopper 10 and the mixer 20 to dry the coal raw material transferred to the mixer 20. In addition, a dryer 18 is installed between the ore hopper 12 and the mixer 20 to dry the ore raw material transferred to the mixer 20. The dryers 16 and 18 are not particularly limited in terms of the structure for drying the moisture of the coal raw material or the ore raw material.

As shown in FIG. 1, the coal raw material in the form of particulates from the carbonaceous material hopper 10 is dried via a dryer 16 and then transferred to the mixer 20. In addition, the ore raw material in the form of particulates from the ore hopper 12 is dried via a dryer 18 and then transferred to the mixer 20. In addition, the binder is fed from the binder tank 14 at a predetermined ratio and supplied to the mixer 20.

The mixer 20 evenly mixes the coal raw material, the ore raw material and the binder to produce a mixture.

In the present embodiment, the binder is composed of an organic-based binder such as tar, pitch, or the like in order to secure formability of the compacted light.

The molding machine 30 has a twin roll type structure as shown in FIG. 1. For example, the molding machine 30 may include two rolls disposed to face each other, a driving motor for rotating the rolls, a compound hopper disposed above the roll, and a press-fit screw installed in the compound hopper. The specific structure of the said molding machine 30 is not specifically limited.

Accordingly, the mixture introduced from the mixer 20 to the molding machine 30 is press-molded while passing between the rolls of the molding machine 30 to produce a compacted light of a predetermined form.

Here, the mixing and molding of the coal raw material and the ore raw material is performed at room temperature.

In this embodiment, the heating furnace 40 is for low-temperature firing the compacted light produced through the molding machine 30, it may be made of a rotary kiln (ratary kiln). The rotary kiln is a cylindrical rotary body lined with refractory material, and is a device for injecting raw materials into the kiln and firing the same. Detailed description of the rotary kiln will be omitted below.

The heating furnace 40 has a structure of low-temperature firing the compacted light charged into the interior at a temperature of 300 to 700 ℃.

The compacted light manufactured through the molding machine 30 may secure the flow rate of coal mixed in the compacted light as it undergoes a low temperature baking process through the heating furnace 40, and the coal acts as a binder so that the compacted light It will increase the bonding force.

When the compacted light heating temperature by the heating furnace 40 is 300 ° C. or less, there is a problem that the heating temperature of the coal is low to obtain fluidity. In addition, when the compacted light heating temperature exceeds 700 ° C., a reduction reaction of the ore occurs, resulting in a problem of deteriorated quality of the compacted light.

Here, the low-temperature firing time of the compacted light through the heating furnace 40 may take about 30 minutes or more and is not particularly limited.

As described above, the mixture is compression molded at room temperature to produce compacted light, and then the compacted light is calcined at low temperature to increase the bonding strength by coal, thereby making it possible to produce carbonaceous embedded compacted light having excellent room temperature strength and hot strength.

Here, the heating furnace 40 includes an air supply part 42 for supplying outside air into the heating furnace 40 in the process of baking the compacted light at low temperature.

The air supply part 42 supplies predetermined air into the heating furnace 40 to burn volatile components. In the process of low-temperature firing the compacted light in the heating furnace 40, the volatile component in the compacted coal is evaporated.

Thus, by supplying predetermined air into the heating furnace 40 through the air supply unit 42 as described above, the volatiles evaporated from the compacted light can be burned and used as a heat supply source in the heating furnace 40.

The compacted light fired at a low temperature by the heating furnace 40 is discharged to the outside of the heating furnace 40 to remove powder or debris through the screen. Particulates and debris in the compacted light are not preferable as fuels and need to be removed. Accordingly, the compacted light having passed through the heating furnace 40 is finally made of carbonaceous embedded compacted light after passing through the screen 50 having an eye size of a predetermined dimension.

2 to 4 show the results of experiments on the strength of the carbonaceous material-containing agglomerated light produced through the present production apparatus as described above.

Strength tests were conducted for each type of coal selected by flow rate.

The classification of coal according to flow rate is shown in Table 1 below.

division Type of shot Flow rate (Log M.F) High flow A 4.14 B 3.17 Heavy oil C 3.57 D 2.62 Low flow E 2.38 F 2.35 Coal Coal G 1.98 H 1.67

Coal raw materials were mixed by mixing the coal raw materials, ore raw materials, and binders of the above types, and then compacted and compacted. Coal raw materials were used as raw materials having a particle size of 0.125 mm, and 6 parts by weight of tar was mixed with 100 parts by weight of tar as a binder to a mixed raw material of 20% of the various coal raw materials and 80% of the ore raw materials. . Then, the compacted compacted compact with a molding pressure of 1.5 t / cm was calcined at 600 ° C. using a coke oven to produce carbon-coated compacted compact.

The strength test was carried out using agglomerated minerals prepared for eight kinds of coals according to the flow rate. The size of the prepared compacted light is 40 x 20 x 11 mm.

The room temperature intensity test of the strength test was carried out through the drop strength measuring device to measure the drop strength by dropping the prepared compacted light.

As shown in FIG. 2, in the case of the compacted minerals of the comparative example which did not undergo the low-temperature firing process after the compacted minerals were manufactured, the strength was about 20 kgf / p for each type of coal according to the flow rate. However, the compacted ore of the present embodiment subjected to low temperature calcining through the present manufacturing apparatus was all measured in comparison with the strength of the comparative example for the coal having the same flow rate, especially in the case of the compacted ore manufactured with coal having a flow rate of 2 or more. It can be seen that more than 100kgf / p can be secured.

3 and 4 show the results of the hot strength test of the carbonaceous-containing compacted ore prepared according to the present embodiment.

Hot strength test was measured by reducing the compressive strength and generation rate after reducing the compacted light prepared as described above to 1000 ℃ under blast furnace simulation conditions. Compressive strength was achieved by means of a compressive strength measuring instrument that measures the strength at compression fracture.

As shown in FIG. 3, it can be seen that the compacted light of the embodiment subjected to the low temperature firing has a high hot strength for all kinds of coals according to the flow rate, compared to the compacted light of the comparative example without undergoing the low temperature calcining process.

In addition, Figure 4 shows the generation rate after reducing the compacted light to 1000 ℃. The experiment on the generation rate was evaluated by measuring the weight mass ratio of the pulverized product having a particle size of 2.8 mm or less after adding the nebulized light reduced to 1000 ° C. in a drum and rotating it 900 times to apply grinding conditions. The hot strength is excellent as the numerical value of the incidence rate of 2.8 mm or less after applying the grinding conditions as described above.

As shown in FIG. 4, in the case of the compacted fired at low temperature according to the present embodiment, the fire firing rate is 14% by weight or less, which is very high even when compared to 25% by weight of the firing rate of sintered ore.

Therefore, it can be seen that in the case of the compacted light produced by low temperature calcining through the present manufacturing apparatus, the room temperature intensity is significantly improved as compared with the compacted light without low temperature calcined treatment.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

10 charcoal hopper 12 ore hopper
14 binder tank 16,18 dryer
20: mixer 30: molding machine
40: heating furnace 42: air supply
50: screen

Claims (7)

Charcoal hopper to store coal raw materials,
Ore hopper to store ore raw materials,
Binder tank for storing binders,
A mixer which is connected to the carbon hopper and the ore hopper and the binder tank and mixes the conveyed coal and the ore and the binder,
A molding machine connected to the mixer to agglomerate the mixture mixed in the mixer at room temperature to produce a compacted light,
Heating furnace for low temperature firing the compacted light produced by connecting to the molding machine at 300 ~ 700 ℃
Charcoal built-in agglomerated mineral manufacturing apparatus comprising a. delete The method of claim 1,
And a dryer provided between the carbon material hopper and the mixer to dry coal transferred to the mixer. The method of claim 1,
And a drier installed between the ore hopper and the mixer to dry the ore transferred to the mixer. The method according to claim 1 or 3 or 4,
Installed in the heating furnace further comprises an air supply unit for supplying air into the heating furnace carbon material-containing agglomerated mineral manufacturing apparatus. The method of claim 5, wherein
And a screen part connected to the heating furnace to remove powder components from the compacted light discharged from the heating furnace. The method of claim 5, wherein
The heating furnace carbon steel built-in compacted light manufacturing apparatus consisting of a rotary kiln.

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