KR101191963B1 - Method for producing carbon composite metal oxide briquette - Google Patents

Abstract

By simplifying the manufacturing process, it is possible to sufficiently secure the room temperature strength and the hot strength of the briquette, and to mix the binder with the mixed raw material of the ore raw material and the coal raw material to produce high quality compacted ore regardless of the type of coal. And preparing a compacted light by molding the mixture, and calcining the prepared compacted light at low temperature. The low temperature calcining step of the compacted light is performed by checking the type of coal and raising the temperature according to the type of coal. It provides a method for manufacturing carbon steel embedded compacted minerals having a different speed structure.

Description

Production method of carbon material-incorporated compacted minerals {METHOD FOR PRODUCING CARBON COMPOSITE METAL OXIDE BRIQUETTE}

The present invention relates to a method for producing blast furnace raw materials in a steelmaking process. More specifically, the present invention relates to a method for producing carbonaceous-containing compacted ore which compacts ore 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. .

In addition, when using expensive coal having excellent caking properties in the production of carbonaceous agglomerated ore can improve the quality of the agglomerated ore, in this case there is a problem that the cost increases.

Therefore, it is important to use low-cost coal in the manufacture of carbonaceous agglomerated ore. For this purpose, it is required to select a coal and develop a manufacturing process that can improve the quality of the agglomerated ore when using low-cost coal.

Accordingly, the present invention provides a method for producing carbonaceous agglomerated ore which is capable of sufficiently securing the room temperature strength and the hot strength of the briquette while simplifying the manufacturing process.

In addition, the present invention provides a method for manufacturing carbon material-containing agglomerated minerals, which enables to manufacture a high quality agglomerated mineral regardless of the type of coal.

To this end, the present manufacturing method includes the steps of preparing a mixture by mixing a binder with a mixed raw material of ore raw material and coal raw material, forming the mixed light to prepare compacted light, and baking the prepared compacted light at low temperature; The low-temperature firing step of the compacted light may be a structure in which a temperature rise rate is changed according to the type of coal by checking the type of coal.

The low temperature firing step of the compacted ore is the step of checking whether the particle size of the coal raw material is less than the reference particle size, if the particle size of the coal raw material is less than the reference particle size, checking whether the flow rate of the coal raw material is more than the reference flow rate, coal raw material Heating the compacted minerals by setting the temperature increase rate for the compacted minerals at 4 to 10 ° C./min during the low temperature firing, when the flow rate of the coal is less than the standard fluidity; It may include the step of heating the compacted light by setting the temperature increase rate for the compacted light at 10 ~ 25 ℃ / min.

The reference particle size may be set to 0.1mm.

The reference flow rate may be set to three.

When the particle size of the coal raw material exceeds the reference particle size to determine whether the flow rate of the coal raw material is more than the reference value, if the flow rate of the coal raw material is more than the reference value the temperature increase rate for the compacted light during the low temperature firing 4 ~ 10 ℃ Heating the compacted light by setting it to / min, and heating the compacted light by setting a temperature increase rate for the compacted light at 10 to 25 ° C./minute when the flow rate of the coal raw material is less than the reference value. Can be.

The reference particle size may be set to 0.1mm.

The reference value may be set to 2.3.

The manufacturing method may further include a screen step of removing powdery or debris from the compacted light produced after low temperature firing.

The compacted light manufacturing step may be performed at room temperature.

The low temperature firing step may be made in the range of 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 easy to manufacture, minimize the manufacturing cost, it is possible to reduce the reducing agent ratio when applying the blast furnace.

In addition, by applying a suitable process according to the type of coal, it is possible to produce a high quality compacted ore using low-cost coal.

1 is a schematic flowchart illustrating a method of manufacturing carbon material-containing compacted light according to the present embodiment.
2 and 3 are graphs showing the results of experiments on the strength of the heating rate according to the type of coal of the carbonaceous-containing agglomerated 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. Wherever possible, the same or similar parts are denoted using 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.

First, referring to a facility for manufacturing carbonaceous agglomerated minerals, for example, a mixer for mixing coal raw materials, ore raw materials and a binder, a molding machine for molding a mixed mixture in a mixer and a compacted compacted mineral It may include a furnace for low temperature firing.

Accordingly, the raw materials conveyed from the hopper for storing coal raw materials, ore raw materials and binders are mixed in a mixer, and the mixture is compacted through a molding machine. After the molding machine, the compacted compacted ore is calcined at low temperature through a heating furnace to produce carbonaceous compacted compacted ore.

1 is a flowchart illustrating a process of manufacturing carbon material-containing agglomerated mineral according to an embodiment of the present invention.

The manufacturing method comprises the step of preparing a mixture by mixing a binder in a mixed raw material of the ore raw material and coal raw material (S100), and forming the compacted light by forming the mixture (S110), low-temperature firing the prepared agglomerated light Step S120 is included.

In addition, the present production method further includes a screen step (S200) for removing powdery or debris from the compacted light produced by low-temperature baking.

Each process is described in detail as follows.

First, the ore raw material 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 raw material of the selected set size is stored and prepared in an ore hopper, for example.

If the particle size of the ore raw material exceeds 5mm, the formability of the compacted light is inferior.

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, for example, a coal ash hopper.

When the particle size of the coal raw material is more than 5mm, also the formability of the compacted light falls.

In addition, the coal raw material may be included in the range of 5 to 30% by weight based on the mixture of the ore raw material and the coal raw material and the binder. If the mixing amount of the coal raw material is out of the above range, there is a problem that the moldability is lowered.

In addition, the coal raw material may be selected to have a flow rate (log M.F) of 0.5 or more. The higher the flow rate of the coal raw material, the higher the cohesiveness, and when the flow rate of the coal raw material is 0.5 or less, the cohesiveness decreases, making it difficult to serve as a binder.

The ore raw material and coal raw material are mixed together with the binder in a mixer. Here, before the raw material mixing, the ore raw material and the coal raw material may be dried.

The coal raw material in particulate form having the above-described structure is transferred to the mixer after drying is completed. In addition, the ore raw material in particulate form is dried and then transferred to a mixer. Moreover, a binder is sent out from a binder tank at a predetermined ratio and supplied to a mixer.

In this way, the coal raw material and the ore raw material and the binder are transferred to the next process to be evenly mixed to prepare a mixture (S100).

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.

In addition, the binder may be included in 3 to 10% by weight of the mixed raw material by extrapolation to the mixed raw material. Since the binder contains water, the moldability of the mixture deteriorates when the binder is out of the above range.

The process for preparing the mixture is here at room temperature. In this embodiment, a separate heating process is unnecessary for preparing the mixture.

The mixture is transferred to a molding machine, which is the next process, and compression molded to produce compacted light of a predetermined form.

Here, the process of compression compacting the mixture to produce compacted light is performed at room temperature. In this embodiment, a separate heating step is not necessary in the process of compression molding the mixture into compacted light.

The compacted light produced through the molding process is secured through a low temperature baking process (S120).

The low temperature firing process may be carried out, for example, by means of a heating furnace such as a rotary 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. The low temperature firing process may be performed through various apparatuses in addition to the rotary kiln, and is not particularly limited.

In the present production method, the low temperature baking step has a structure in which the compacted light is heated to a temperature of 300 to 700 ° C.

As the low temperature calcination process passes, the flow rate of coal mixed in the compacted ore can be secured, and the coal serves as a binder to increase the binding force of the compacted ore.

When the compacted light heating temperature is 300 ° C. or lower, there is a problem in 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 manufacturing method has a structure in which the temperature increase rate is varied according to the type of coal raw material in the process of calcining the compacted light at low temperature.

That is, the low-temperature firing step of the compacted ore is a coal raw material particle size checking step (S130) to determine whether the particle size of the coal raw material is 0.1mm or less, the coal raw material when the particle size of the coal raw material in the coal raw material particle size checking step is 0.1mm or less Step (S140) of checking whether the flow rate is at least 3, when the flow rate of the coal raw material is at least 3 step of heating the compacted light by setting the temperature increase rate for the compacted light at 4 ~ 10 ℃ / min during the low temperature firing (S150), when the flow rate of the coal raw material is 3 or less comprises the step of heating the compacted light by setting the temperature increase rate for the compacted light at 10 ~ 25 ℃ / min during the low-temperature firing (S160).

In addition, the low-temperature firing step is a step of checking whether the flow rate of the coal raw material is 2.3 or more when the particle size of the coal raw material exceeds 0.1mm (S170), when the flow rate of the coal raw material is 2.3 or more agglomerated mineral at the low temperature firing Step to heat the compacted light by setting the temperature increase rate for 4 ~ 10 ℃ / min (S180), when the flow rate of coal raw material is less than 2.3, the temperature increase rate for the compacted light during the low temperature firing 10 ~ 25 ℃ / min It is set to include the step of heating the compacted light (S190).

The temperature increase rate refers to a rate of temperature rise with respect to the time of compacted baking at low temperature.

Here, the kind of coal raw material may be classified according to the particle size of the coal raw material, or may be classified according to the flow rate of the coal raw material.

In this embodiment, since the coal raw material has fine powder having a particle size of 5 mm or less, the coal raw material particle size checking step (S130) confirms whether the particle size of the coal raw material is in the range of 0.1 mm or less or in the range of 5 mm or less and more than 0.1 mm. Done. That is, the manufacturing method of the present embodiment can be classified into two types according to the particle size of the coal raw material.

In addition, according to the present manufacturing method, the type of coal raw material may be classified according to the flow rate of coal. In this embodiment, coal raw materials may be classified as shown in Table 1 below according to the flow rate.

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

According to the present method, the heating rate of the compacted ore is changed depending on the type of coal raw materials classified as described above.

First, when the particle size of the coal raw material is 0.1mm or less, the present manufacturing method will vary the temperature increase rate at low temperature firing for the compacted light by type according to the flow rate of the coal raw material. As a result of experiments according to the flow rate of coal raw materials, it was confirmed that varying the heating rate based on the flow rate 3 can increase the intensity of all the agglomerated minerals regardless of the flow rate.

Figure 2 shows the results of the intensity test of the compacted light according to the temperature increase rate according to the flow rate of the coal raw material when the particle size of the coal raw material is 0.1mm or less.

The compacted ore used in this experiment was prepared by mixing the coal raw materials, ore raw materials and binders of each type, compression compacting the compacted ore and then calcining at low temperature. As a coal raw material, a raw material having a particle size of 0.1 mm was used, 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.

A strength test was made for each of the compacted minerals according to the flow rate of the coal raw material. The size of the prepared compacted light is 40 x 20 x 11 mm.

During the strength test, the strength test was performed through a compressive strength measuring device which measures the strength when the prepared compacted light is compressed and crushed.

As shown in FIG. 2, when the particle size of the coal raw material is 0.1 mm or less as a result of the experiment, when the flow rate of the coal raw material is 3 or less, the temperature increase rate at low temperature firing of the compacted ore is set in a range of 10 to 25 ° C./min. By baking at low temperature, it can be seen that the intensity of the compacted light can be further increased.

In addition, it can be seen that when the flow rate of the coal raw material exceeds 3, the strength of the compacted light can be further increased by setting the temperature increase rate during the low temperature firing of the compacted light at 4 to 10 ° C./minute and baking at a low temperature.

On the other hand, in the case where the particle size of the coal raw material exceeds 0.1mm, varying the heating rate based on the flow rate 2.3 based on the flow rate of the coal raw material can increase the intensity of all the compacted light regardless of the flow rate It was confirmed.

FIG. 3 shows the results of the test of the intensity of the agglomerated minerals at different heating rates according to the flow rate of the coal raw material when the particle size of the coal raw material is 5 mm.

The agglomerated light used in this experiment has the same particle size as that of the above-mentioned components except for the particle size of 5mm. The strength test was also done with a compressive strength measuring instrument.

As shown in FIG. 3, when the particle size of the coal raw material exceeds 0.1 mm, when the flow rate of the coal raw material is 2.3 or less, the temperature increase rate at low temperature firing of the compacted ore is in the range of 10 to 25 ° C./min. It can be seen that the intensity of the compacted light can be further increased when set to.

In addition, it can be seen that when the flow rate of the coal raw material exceeds 2.3, the intensity of the compacted light can be further increased when the temperature increase rate during the low temperature firing of the compacted light is set to 4 to 10 ° C./minute.

As described above, by varying the temperature increase rate during the low temperature firing of the compacted minerals according to the type and particle size of the coal raw materials, the intensity of the compacted minerals produced regardless of the type of coal raw materials can be increased.

On the other hand, the compacted light produced through the low-temperature firing process is removed through the screen in the next step to remove the powder and debris, etc. (S200) The powdered powder and debris of the compacted light is not preferable as a fuel, it needs to be removed. Accordingly, the compacted light having undergone the low temperature firing process can be made into carbonaceous compacted compacted light by removing the powder component through a screen having an eye size of a predetermined dimension.

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.

Claims (9)

Preparing a mixture by mixing a binder with a mixed raw material of an ore raw material and a coal raw material, molding the mixture to produce a compacted light, and performing low temperature firing of the prepared compacted light;
The low temperature firing step of the compacted ore is the step of checking whether the particle size of the coal raw material is less than the reference particle size, if the particle size of the coal raw material is less than the reference particle size, checking whether the flow rate of the coal raw material is more than the reference flow rate, coal raw material Heating the compacted minerals by setting the temperature increase rate for the compacted minerals at 4 to 10 ° C./min during the low temperature firing, when the flow rate of the coal is less than the standard fluidity; A method of manufacturing carbon steel-containing agglomerated minerals having different heating rates depending on the type of coal by checking the type of coal, including heating the agglomerated mineral by setting a temperature raising rate for the agglomerated mineral at 10 to 25 ° C / min. The method of claim 1,
The low-temperature firing step is a method for producing carbon steel embedded compacted mineral made in the range of 300 ~ 700 ℃. delete The method of claim 1,
The reference particle size is 0.1mm carbonaceous material embedded compact manufacturing method. The method of claim 4, wherein
The reference flow rate is a carbon material built-in compacted ore manufacturing method of three. The method of claim 1,
When the particle size of the coal raw material exceeds the reference particle size to determine whether the flow rate of the coal raw material is more than the reference value, if the flow rate of the coal raw material is more than the reference value the temperature increase rate for the compacted light during the low temperature firing 4 ~ 10 ℃ Heating the compacted light by setting it to / min, and heating the compacted light by setting a temperature increase rate for the compacted light at 10 to 25 ° C./minute when the flow rate of coal raw material is lower than a reference value. Method for producing carbonized viscera compacted ore. The method according to claim 6,
The reference particle size is 0.1mm carbonaceous material embedded compact manufacturing method. The method of claim 7, wherein
And the reference value is 2.3. The method according to claim 6,
And a screen step of removing powdery or debris from the compacted light produced after the low-temperature firing.

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