KR20090126129A - Carbon dioxide fixing equipment using steel making slag - Google Patents

Abstract

PURPOSE: An apparatus for fixing carbon dioxide using steelmaking slag is provided to secure the cerussite disposal raw materials, and to produce calcium carbonate of high purity capable of recycling energy without additional energy consumption. CONSTITUTION: An apparatus for fixing carbon dioxide using steelmaking slag includes a carbon dioxide dissolver(10), a reaction bath(20), and a settling tank(30). A carbon dioxide inlet pipe(13) has a carbon dioxide valve(13a). A water inlet pipe(14) has a water valve(14a). The reaction bath is connected with the carbon dioxide dissolver. The settling tank is connected with the reaction bath by a water discharge pipe(21). The settling tank has a calcium carbonate collecting pipe(34) and a settling tank discharge pipe(33). The carbon dioxide discharging pipe(16) is installed between the carbon dioxide dissolver and the settling tank.

Description

Carbon dioxide fixing equipment using steel making slag

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon dioxide fixing device, and more particularly, to a carbon dioxide fixing device using steel slag, which can reduce costs by fixing / treating carbon dioxide using steel slag which is a huge amount of waste generated in the steelmaking process.

It is well known that the main cause of global warming is carbon dioxide, which is contained in human activities such as automobile smoke, household emissions and factory emissions. Therefore, various carbon dioxide treatment technologies are being developed to meet the increasing demand for global warming prevention.

The treatment technology of carbon dioxide is largely divided into marine disposal, underground disposal, and carbonate mineralization disposal.

Ocean disposal is a method of injecting and disposing gaseous carbon dioxide into deep seabed in high pressure environment, but the most realistic carbon dioxide treatment technology, but dissolved carbon dioxide can be released back to the atmosphere according to the flow of seawater, so the disposal period is short. There are disadvantages that can affect marine ecosystems.

Underground disposal is a treatment technology that injects carbon dioxide into a gaseous or dissolved state in oil, coal, and aquifers.It can dispose of carbon dioxide semi-permanently, but it is difficult to find the geological target for disposal. There is a disadvantage that can be discharged.

Carbonate mineralization disposes carbon dioxide and magnesium carbonate (serpentine, etc.) at high temperature and high pressure to produce and disperse calcium carbonate and magnesium carbonate. Although there is an advantage that can be, a lot of energy is consumed in the production of carbonate minerals, there is not a substantial carbon dioxide reduction effect, and it is difficult to secure enough silicate minerals as a raw material for carbonate mineralization.

The present invention has been made to solve the above-mentioned problems of the prior art, the steel slag which can secure a large amount of carbonate mineralization disposal raw material by fixing the carbon dioxide using the steel slag which is a huge amount of waste generated in the steelmaking process The purpose is to provide a carbon dioxide fixing device used.

In addition, by operating the process at room temperature, the purpose is to provide a carbon dioxide fixing device using a steel slag that can produce a high-purity calcium carbonate that can be reused without additional energy.

)과 탄산염이온(

)의 반응에 의하여 탄산칼슘이 생성되고, 생성된 탄산칼슘을 배출하기 위한 탄산칼슘 회수관과 탄산칼슘이 생성된 후 잔류한 용수를 배출하기 위한 침전조 배출관이 설치된 침전조;로 구성된다.Carbon dioxide fixing device using a steel slag according to the present invention for solving the above problems is a carbon dioxide inlet pipe with a carbon dioxide valve and a water inlet pipe with a water valve is installed on one side carbon dioxide is dissolved in the water inside the carbon dioxide A dissolution tank; A reaction tank connected to the carbon dioxide dissolution tank by a water outlet pipe and containing a steel slag to react with the water in which carbon dioxide is dissolved and the steel slag; Connected to the reaction tank by a water discharge pipe, the water containing dissolved carbon dioxide reacted with the steel slag flows into the calcium ion (

) And carbonate ions (

Calcium carbonate is produced by the reaction of), and a precipitation tank is provided with a calcium carbonate recovery tube for discharging the produced calcium carbonate and a sedimentation tank discharge tube for discharging the remaining water after the calcium carbonate is produced.

Here, a carbon dioxide discharge pipe is installed between the dissolution tank and the settling tank so that carbon dioxide not dissolved in the dissolution tank is introduced into the settling tank.

In addition, the carbon dioxide inlet pipe is provided at the end thereof with a first bubble generating device so that carbon dioxide is dissolved in water in a bubble state inside the carbon dioxide dissolution tank, and the carbon dioxide discharge pipe is provided with a second bubble generating device at the end thereof in the settling tank. In a bubbled state, carbon dioxide is dissolved in the water.

The carbon dioxide fixing device using the steel slag according to the present invention configured as described above is able to dispose of carbon dioxide semi-permanently by fixing carbon dioxide to a solid called calcium carbonate using the steel slag as waste, and thus recovered calcium carbonate is recycled. There is an advantage to improve the economics possible.

Hereinafter, an embodiment of a carbon dioxide fixing device using a steel slag according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a schematic configuration of a carbon dioxide fixing device using a steel slag according to the present invention, Figure 2 is a cross-sectional view of the carbon dioxide fixing device using a steel slag shown in FIG.

In addition, Figure 3 is a graph showing the change in the concentration of calcium ions as a result of the reaction of the steel slag 2g and distilled water, Figure 4 is a graph showing the pH change result of the reaction of the steel slag 2g and distilled water.

5 is a graph for predicting the amount of precipitated calcium carbonate and pH change according to the amount of carbon dioxide dissolved in the solution reacted with the steel slag for 24 hours, and FIG. 6 is the carbon dioxide dissolved in the solution reacted with the steel slag for 384 hours. It is a graph predicting the amount of calcium carbonate that can be precipitated and the pH change according to the amount of.

The carbon dioxide fixing device using the steel slag according to the present invention is a carbon dioxide dissolution tank 10, the reaction tank 20 is installed in connection with the carbon dioxide dissolution tank 10, and the precipitation tank 30 is installed in connection with the reaction tank (20). It consists of.

The carbon dioxide dissolution tank 10 is composed of a dissolution body portion 11 and a head portion 12 integrally formed at the upper end of the dissolution body portion 11.

The dissolution main body 11 has a cylindrical shape, the lower side of the carbon dioxide inlet pipe 13 and the water inlet pipe 14 is connected. Carbon dioxide and water are introduced into the dissolution main body 11 through the carbon dioxide inflow pipe 13 and the water inflow pipe 14, and considering that carbon dioxide must be dissolved in the water, a certain amount of water is first dissolved in the main body ( 11) flowed in and then supplied with carbon dioxide to cause the carbon dioxide to be ejected from the water. In addition, the dissolution body portion 11 is provided with a water outlet pipe 15 connected to the reaction tank 20 on the upper side.

The carbon dioxide inlet pipe 13 is provided with a carbon dioxide valve 13a on its line, and the water inlet pipe 14 has a water valve 14a on its line.

The head portion 12 is configured in a solid form in order to capture carbon dioxide not dissolved in water in the dissolution body portion 11. A carbon dioxide discharge pipe 16 is installed at an upper end of the head part 12, and the carbon dioxide discharge pipe 16 is connected to the settling tank 30 to transfer the carbon dioxide collected from the head part 12 to the settling tank 30. .

Meanwhile, a dissolution main body 11 electrically connected to the carbon dioxide valve 13a and the water valve 14a and connected to the water outlet pipe 15 at an upper side inside the dissolution main body 11 of the carbon dioxide dissolution tank 10. The first level sensor S1 is installed at the same height as the point. Therefore, when the pressure of the carbon dioxide collected in the head part 12 is increased and the water level in the dissolution body part 11 is lower than the point at which the water outlet pipe 15 is connected, the first water level sensor S1 detects this. By blocking the carbon dioxide valve 13a so that carbon dioxide is no longer introduced into the dissolving body portion 11.

In addition, the carbon dioxide inlet pipe 13 has a first bubble generating device (B1) at the end thereof, the first bubble generating device (B1) is a bubble state of the carbon dioxide introduced through the carbon dioxide inlet pipe 13 in a bubble state By ejecting, more carbon dioxide in the carbon dioxide dissolution tank 10 can be dissolved in more water.

The process of dissolving carbon dioxide in water is simply as follows.

+

=

=

+

+

=

=

+

That is, carbon dioxide reacts with water to form carbonic acid, and some of the carbonic acid dissociates to release hydrogen ions, thereby lowering the pH.

The reactor 20 is connected to the carbon dioxide dissolution tank 10 by the water outlet pipe 15, and the steel slag is accommodated therein. Therefore, the water in which carbon dioxide is dissolved is introduced into the reaction tank 20 through the water outlet pipe 15, and the water reacts with the steel slag.

In general, steel slag contains a large amount of various elements, and among these various elements, calcium oxide (CaO) reacts with dissolved water of carbon dioxide introduced through the water outlet pipe (15).

The process of reacting water with carbon dioxide dissolved calcium oxide is as follows.

=

+

CaO +

=

+

)과 수산화이온(

)을 내어놓는다.That is, when water in which carbon dioxide is dissolved reaches the reaction tank 20, the reaction tank 20 reacts with calcium oxide (CaO) contained in a large amount of steel slag and water to react with calcium ions (

) And hydroxide ions (

).

) 함량변화를 나타낸 도 3을 참조로 하여 위 반응을 살펴보면 칼슘이온(

)은 최대 236mg/l까지 증가한다. Calcium ion when 2g of steel slag and 40ml of water were reacted at 25 ℃

Looking at the above reaction with reference to Figure 3 showing the change in content of calcium ions (

) Increases up to 236 mg / l.

)과 pH는 급격히 증가한 후 대체로 일정하게 유지되는 양상을 나타낸다.In addition, referring to FIG. 4, which shows a change in pH when 2 g of steel slag and 40 ml of water are reacted at 25 ° C., the pH increases up to 12.08. Usually up to 24 hours

) And pH are generally constant after a sharp increase.

)과 탄산염이온(

)의 반응에 의하여 탄산칼슘이 생성된다.The settling tank 30 is connected to the reaction tank 20 by the water discharge pipe 21, the calcium is introduced into the water by the inflow of the dissolved carbon dioxide reacted with the steel slag (

) And carbonate ions (

Calcium carbonate is produced by the reaction.

The settling tank 30 is formed of a cylindrical settling body portion 31 connected to the carbon dioxide discharge pipe 16, and integrally formed at the lower end of the settling body portion 31, the calcium carbonate recovery pipe 34 is connected to the bottom Consists of a solid bottom 32.

The settling body portion 31 is connected to the carbon dioxide discharge pipe 16 installed in the head portion 12 of the carbon dioxide dissolving tank 10, the settling tank discharge pipe 33 is formed on one side and the calcium carbonate is produced after the settling tank 30 The water remaining in the inside is discharged through the sedimentation tank discharge pipe 33.

Calcium carbonate recovery valve 34a is installed in the calcium carbonate recovery pipe 34 installed at the bottom 32 to periodically recover the sludge calcium carbonate.

The process of forming calcium carbonate in the precipitation tank 30 is as follows.

+

+

+

=

+

+

+

+

=

+

)은 이산화탄소의 용해로 인해 발생된 수소이온(

)과 반응하여 중화되고, 칼슘이온(

)은 탄산염이온(

)과 반응한다.That is, hydroxide ions (

) Is the hydrogen ion (

Neutralized by reaction with calcium ions (

) Is a carbonate ion (

React).

)의 양은 4.0mmol이다. 따라서 제 철슬래그 2g당 이산화탄소 0.3g이 처분될 수 있으며 탄산칼슘은 0.4g 침전될 수 있다.Looking at the above reaction with reference to Figure 5 showing the amount of carbon dioxide that the steel slag can be dissolved in the water reacted for 24 hours, when the amount of carbon dioxide injected is 7mmol, the maximum possible precipitation of calcium carbonate, which is the solution of This is because the pH is maintained above 10. At this time, the precipitated calcium carbonate (

) Is 4.0 mmol. Therefore, 0.3 g of carbon dioxide may be disposed of per 2 g of steel slag, and 0.4 g of calcium carbonate may be precipitated.

)의 양은 5.1mmol이다. 따라서 제철슬래그 2g당 이산화탄소 0.3g이 처분될 수 있으며 탄산칼슘은 0.5g 침전될 수 있다. 따라서, 이산화탄소가 용해된 물이 제철슬래그와 약 24시간동안 반응하는 것이 이산화탄소의 처분을 최적화할 것으로 예상된다.In addition, referring to FIG. 6, which shows the amount of carbon dioxide that can be dissolved in water reacted with steel slag for 384 hours (16 days), when the injection amount of carbon dioxide is 7 mmol, as in FIG. The maximum amount of precipitation possible is attained because the pH of the solution is kept above 10. At this time, the precipitated calcium carbonate (

) Is 5.1 mmol. Therefore, 0.3 g of carbon dioxide may be disposed of per 2 g of steel slag, and 0.5 g of calcium carbonate may be precipitated. Therefore, the reaction of carbon dioxide-dissolved water with steel slag for about 24 hours is expected to optimize the disposal of carbon dioxide.

On the other hand, the carbon dioxide discharge pipe 16 has a second bubble generating device (B2) at its end, the second bubble generating device (B2) is the carbon dioxide introduced into the settling tank 30 through the carbon dioxide discharge pipe (16). By blowing in a bubble state, the carbon dioxide in the settling tank 30 to be more dissolved in water.

In addition, the upper part of the sedimentation body part 31 of the sedimentation tank 30 inside the sedimentation body part 31 which is electrically connected to the carbon dioxide valve 13a and the water valve 14a and connected to the sedimentation tank discharge pipe 33. The second water level sensor S2 is installed at the same height. Therefore, even in the sedimentation tank 30, the carbon dioxide not dissolved in the water is collected on the sedimentation tank 30, and the pressure of the collected carbon dioxide is increased so that the water level inside the sedimentation tank 30 is lower than the point where the sedimentation tank discharge pipe 33 is connected. The second water level sensor S2 detects this to block the water flowing out to the sedimentation tank discharge pipe 33, and at the same time, adjusts the amount of carbon dioxide and water by adjusting the carbon dioxide valve 13a and the water valve 14a.

On the other hand, the calcium carbonate discharged from the settling tank 30 is dried in the form of sludge, and the water discharged through the settling tank discharge pipe 33 contains a large amount of calcium ions and calcium carbonate ions and is discarded in the sea because the pH is high. It is preferable. In general, since seawater has a chemical condition in which calcium carbonate can be precipitated, calcium carbonate that is not precipitated in the precipitation tank 30 is precipitated at the ocean floor.

1 is a perspective view showing a schematic configuration of a carbon dioxide fixing device using a steel slag according to the present invention.

Figure 2 is a cross-sectional view of the carbon dioxide fixing device using the steel slag shown in FIG.

Figure 3 is a graph showing a change in the concentration of calcium ions as a result of the reaction of the steel slag 2g and distilled water.

Figure 4 is a graph showing the pH change result of the reaction of the steel slag 2g and distilled water.

5 is a graph predicting the amount of precipitated calcium carbonate and pH change according to the amount of carbon dioxide dissolved in the solution reacted with the steel slag for 24 hours.

Figure 6 is a graph predicting the amount of precipitated calcium carbonate and pH change according to the amount of carbon dioxide dissolved in the solution reacted with steel slag for 384 hours.

<Explanation of symbols on main parts of the drawings>

10: carbon dioxide dissolution tank 11: melting body part

12: head portion 13: carbon dioxide inlet pipe

14: water inlet pipe 15: water outlet pipe

16: carbon dioxide discharge pipe 20: reactor

21: water discharge pipe 30: sedimentation tank

31: sedimentation main body portion 32: bottom portion

33: sedimentation tank discharge pipe 34: calcium carbonate recovery pipe

B1: first bubble generator B2: second bubble generator

S1: first level sensor S2: second level sensor

Claims (6)

A carbon dioxide dissolution tank 10 having a carbon dioxide inlet pipe 13 having a carbon dioxide valve 13a and a water inlet pipe 14 having a water valve 14a installed at one side thereof to dissolve carbon dioxide in the water therein; A reaction tank 20 connected to the carbon dioxide dissolution tank 10 by a water outlet pipe 15 to accommodate the steel slag and reacting the water with the carbon dioxide dissolved therein with the steel slag; It is connected to the reaction tank 20 by a water discharge pipe 21 so that the water containing carbon dioxide dissolved in the steel slag is dissolved, thereby introducing calcium ions (

) And carbonate ions (

Calcium carbonate is produced by the reaction of the reaction mixture, and the precipitation tank 30 is provided with a calcium carbonate recovery tube 34 for discharging the produced calcium carbonate and a sedimentation tank discharge tube 33 for discharging the remaining water after the calcium carbonate is produced. Carbon dioxide fixing device using a steel slag, characterized in that consisting of. The method according to claim 1, The carbon dioxide discharge pipe 16 is installed between the carbon dioxide dissolution tank 10 and the precipitation tank 30, and carbon dioxide not dissolved in the carbon dioxide dissolution tank 10 is introduced into the precipitation tank 30. Device. The method according to claim 2, The carbon dioxide dissolution tank 10 includes a cylindrical dissolution body portion 11 to which a carbon dioxide inflow pipe 13 and a water inflow pipe 14 are connected; Solid that is formed integrally with the upper end of the dissolution body portion 11 to collect the carbon dioxide not dissolved in water and the carbon dioxide discharge pipe 16 is connected to the upper end to transfer the collected carbon dioxide to the settling tank 30 Carbon dioxide fixing device using a steel slag, characterized in that consisting of; The method according to claim 2, The settling tank 30 has a cylindrical settling body portion 31 connected to the carbon dioxide discharge pipe 16; The carbon dioxide fixing device using the steel slag, characterized in that consisting of; integrally formed at the bottom of the settling body portion 31, the calcium carbonate recovery pipe 34 is connected to the bottom bottom 32. The method according to claim 1, The carbon dioxide inlet pipe 13 is provided with a first bubble generating device (B1) at the end of the carbon dioxide fixing device using a steel slag, characterized in that carbon dioxide is dissolved in water in a bubble state inside the carbon dioxide dissolution tank (10). The method according to claim 1, The carbon dioxide discharge pipe (16) is provided with a second bubble generating device (B2) at the end of the carbon dioxide fixing device using the steel slag, characterized in that the carbon dioxide is dissolved in the water in the bubble state inside the settling tank (30).

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