JP2009058442A - Eluted element sampling device from rock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an eluted element sampling device from a rock capable of making an acidic solution react with the rock in conformity to the state of an actual environment. <P>SOLUTION: A heater 50 is provided to a housing container 10 in which a test piece 20 is housed and the test piece 20 is set to the temperature corresponding to the actual environment by the heater 50. The test piece 20 set to the temperature corresponding to the actual environment is immersed in a saturated CO<SB>2</SB>dissolved solution, so that the saturated CO<SB>2</SB>dissolved solution, in which the element from the test piece 20 is dissolved, is sampled by a syringe 70. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a device for collecting elution elements from rocks composed of various kinds of minerals or rocks that are obtained by immersing powdered rocks in a solution, and particularly includes a saturated solution of carbon dioxide and carbon dioxide. In order to evaluate the environmental impact on the real environment in carbon dioxide geological storage, we verify the elements that elute due to the presence of a saturated solution of carbon dioxide by reacting rocks immersed in undissolved rocks or powdered rocks. It is suitable for use.

In recent years, various efforts have been made to mitigate global warming. For example, energy saving and emission of carbon dioxide (hereinafter referred to as CO ₂ ) have been carried out. As one of such efforts, technology that reduces CO ₂ emissions by storing CO ₂ emitted from factories, power plants, etc. in the ground is considered to be an effective method for reducing CO ₂ emissions. (For example, refer to Patent Document 1).

In the practice of the CO ₂ geological storage is, CO ₂ is pressed into underground aquifers, and changes to acidic CO ₂ saturation solubility solution by ground water influence of CO ₂ stored included in the aquifer Will do. The stored CO ₂ is stored underground for a long period of time and is dissolved in the ground water even after the CO ₂ injection stop. The groundwater in which the CO ₂ is stored underground and the surrounding groundwater are more acidic than the natural state, and the surrounding rocks undergo chemical reactions, affecting the groundwater used by humans, and the daily lives of humans. Therefore, it is an urgent task to identify elements that can be easily eluted only by reaction with CO ₂ and to elucidate the mechanism of element elution.

Such study actually tentatively pressed the CO ₂ underground, groundwater collected from stop pressed after a certain period of time, to analyze the composition of the collected groundwater, CO in geological storage ₂ Can be evaluated. However, even though it is experimental, CO ₂ is stored several hundred meters below ground, and in order to clarify the effects of CO ₂ by collecting ground water and rocks for a long time after storage, it is very expensive and ground water and rocks are used in the actual environment. A lot of problems occur because of the need for techniques to collect the raw materials.

Further, the depth for storing location and CO ₂ to perform CO ₂ sequestration, vary in temperature and pressure of the underground, be reacted with CO ₂ saturated dissolved solution rock of the same type, the temperature environment different locations The rock condition cannot be reproduced. For this reason, it is currently impossible to accurately grasp what harmful elements elute from underground rocks according to various actual environments with different temperature and pressure conditions during CO ₂ underground storage .

JP 2004-237167 A (Claim 7 etc.)

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a device for collecting eluted elements from a rock, which can collect a solution from which elements constituting the rock are eluted by a chemical reaction.

  According to a first aspect of the present invention, there is provided a device for collecting elements eluted from a rock according to the first aspect of the present invention, a storage container storing a solution for immersing the rock, and a solution stored in the storage container outside the storage container. And a collecting means for collecting the reaction solution in which the rock is immersed from the storage container.

  In the present invention according to claim 1, the elution of elements from the rock into the solution is reproduced in the storage container, and the reaction solution can be collected without contact with the atmosphere in order to analyze the dissolved elements. The rock described in the present specification and claims is a collective term for solid rocks and powders obtained by pulverizing rocks, and the reaction solution is a solution in which rock elements are eluted.

  The device for collecting elements from rocks of the present invention according to claim 2 is the device for collecting elements from rocks according to claim 1, in which the temperature of the rock stored in the storage container and the temperature of the solution is set. The temperature control means optionally sets the temperature of the solution for immersing the rock stored in the storage container according to the environment.

  In the present invention according to claim 2, the rock and the solution stored in the storage container are automatically changed and maintained by the program at a temperature corresponding to the actual environment by this temperature control means. As a result, the rock stored in the storage container reacts by being immersed in the solution under conditions equivalent to the temperature of the actual environment, so the collected reaction solution contains elements that elute from the rock in the actual environment It becomes.

  The device for collecting elements from rocks of the present invention according to claim 3 is the device for collecting elements from rocks according to claim 1 or 2, wherein the rocks store carbon dioxide in the ground. In order to investigate the impact on the human living environment, it is characterized by carbon dioxide collected from the geological formation planned to be stored in the ground and its surrounding geological formations.

With the present invention according to claim 3, you can investigate an element eluted into ground water due to the effect of CO ₂ geological storage of CO ₂ from the formation of underground storage.

  The device for collecting elements eluted from rocks of the present invention is a method in which elements constituting rocks are eluted into a solution according to the actual environment, and a reaction solution formed by reaction with this solution is collected without contact with the atmosphere. This is a device for collecting elements from rocks that can be stored.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall configuration of a device for collecting elements eluted from rocks according to an embodiment of the present invention, and FIG. 2 shows a schematic cross section of CO ₂ stored underground. The illustrated embodiment is an exemplification, and the present invention is not limited to the following description.

  The overall configuration of the sampling device will be described with reference to FIG.

  As shown in FIG. 1, the storage container 10 is a cylindrical container formed so that a rock of an arbitrary shape or a powder obtained by pulverizing a rock (hereinafter referred to as a specimen 20) is stored therein. The specimen 20 is arbitrarily shaped into a shape that can be stored in the storage container 10 and stored in the storage container 10. The storage container 10 is provided with an O-ring 13 and a lid 11 as blocking means. The O-ring 13 is attached to the opening of the storage container 10, and the lid 11 is locked in a state where the opening of the storage container 10 is closed. A ring-shaped fixing member 12 is fitted to the outer periphery of the storage container 10 and the lid 11 locked to the storage container 10. The storage container 10 and the lid 11 are made of a heat and acid resistant corrosion alloy, for example, Hastelloy (registered trademark) whose main component is nickel. The O-ring 13 is made of Viton rubber (registered trademark) that can withstand temperatures up to 200 ° C.

A stirrer 15 is disposed at the bottom of the storage container 10, and the stirrer 15 is rotated by the magnetic force of a magnetic stirrer (not shown) to store a solution stored in the storage container 10 or a CO ₂ saturated solution 41. (Reaction solution) is stirred.

  The mesh base 16 supports the specimen 20. Specifically, the mesh base 16 includes a pedestal portion that is a flat plate member and a plurality of leg portions attached to the pedestal portion.

The specimen 20 is placed on the upper surface of the pedestal portion of the mesh base 16, and a space that does not hinder the rotation of the stirrer 15 is formed below the pedestal portion. Further, the pedestal portion is provided with a plurality of through holes penetrating in the thickness direction, and serves as a passage for the solution stirred by the stirrer 15 or the CO ₂ saturated solution 41. This through hole is provided to facilitate stirring of the solution or the CO ₂ saturated solution 41.

A pipe 31 is inserted into the lid 11, a CO ₂ gas tank 30 is connected to the storage container 10 via the pipe 31, and a valve 32 is interposed in the pipe 31. The CO ₂ gas tank 30 CO ₂ gas 40 CO ₂ gas 40 is filled is pressed into the interior of the container 10 through the pipe 31. A valve 32 is interposed in the pipe 31.

A solution in accordance with the actual environment prepared in advance is stored in the storage container 10. When the valve 32 is opened, CO ₂ gas is injected into the storage container 10, and the CO ₂ gas is dissolved in the solution. Thus, a CO ₂ saturated solution 41 is prepared. After a predetermined CO ₂ gas is injected, the valve 32 is closed. As a result, a closed environment in which the CO ₂ saturated solution 41 cannot enter and exit unless the valve 32 is opened is constructed inside the storage container 10. Incidentally, the amount of dissolved CO ₂ gas is calculated by gage transducer strain diameter and displacement of the piston of the piston attached to the CO ₂ gas tank 30.

The pressure of the container 10 is controlled to a pressure corresponding to the actual environment using the pressure of the CO ₂ gas 40 pressurized with CO ₂ gas tank 30. In addition, a pressure gauge 14 is attached to the storage container 10, and the pressure gauge 14 measures, displays, and records the pressure value of the CO ₂ gas 40.

Further, a pipe 71 is inserted into the lid 11, and a syringe 70 as a collecting means is connected to the storage container 10 through the pipe 71. A sampling valve 72 is interposed between the syringe 70 and the lid 11 in the pipe 71. When the collection valve 72 is opened while the lid 11 is fixed to the storage container 10, a predetermined amount of CO ₂ gas 40 in the storage container 10 is collected by the syringe 70. Further, when the collection valve 72 is closed, the specimen 20 and the CO ₂ gas 40 in the storage container 10 are maintained in a state of being cut off from the outside of the storage container 10.

  The storage container 10 is provided with a temperature control device 51 as temperature control means for setting the temperature of the specimen 20 accommodated therein to a temperature corresponding to the actual environment. The temperature is controlled by a heater 50 on the outer periphery of the storage container 10. The heater 50 is set to an arbitrary temperature based on a control signal from the temperature control device 51, and the temperature of the specimen 20 of the storage container 10 is set to a predetermined temperature. Is set. As the predetermined temperature of the specimen 20 set by the temperature control device 51, a temperature corresponding to the actual environment and an arbitrary temperature before and after the actual environment are used. The temperature according to the actual environment is, for example, an actual measurement value of the specimen 20 before mining at the location where the specimen 20 is mined, and in order to clarify the influence of the temperature, the temperature is higher and lower than the actual measurement value Use temperature.

Elution element sampling device from rocks above structure, in order to analyze the elements of the specimen 20 was eluted in CO ₂ saturation solubility solution 41, the CO ₂ saturation solubility solution 41 immersing the specimen 20 in the container 10. Collected. When collecting the CO ₂ saturated solution 41, the drain valve 34 is closed and the collection valve 72 is opened, so that the CO ₂ saturated solution 41 in which the specimen 20 is immersed is collected by the syringe 70. When removing the lid 11 from the storage container 10 and collecting the CO ₂ gas 40, there is a possibility that impurities or the like may be mixed into the CO ₂ saturated solution 41, but there is no such mixing in the sampling device. Therefore, it is possible to collect the CO ₂ saturated solution 41 (reaction solution) in which only the elements eluted from the specimen 20 in the storage container 10 are dissolved.

Thus, since the test piece 20 is immersed in the CO ₂ saturated solution 41 while being cut off from the outside of the storage container 10, the CO ₂ is caused by factors other than the chemical reaction between the test sample 20 and the CO ₂ saturated solution 41. ₂ The state of the saturated solution 41, such as pH and pressure, is not affected. Assuming the CO ₂ sequestration, the situation where the specimen 20 at a position that is assumed CO ₂ geological storage even after the finished implement CO ₂ geological storage continues to be immersed in the CO ₂ saturation solubility solution 41 The CO ₂ saturated solution 41 can be collected by reproducing in the storage container 10.

Further, the heater 50 is adjusted to a desired temperature under the control of the temperature control device 51, and the temperature of the specimen 20 stored in the storage container 10 is maintained at a temperature according to the actual environment. For example, when CO ₂ underground storage is assumed, the temperature of the specimen 20 is maintained at a temperature corresponding to the temperature environment at a desired depth in the assumed location. As a result, the reaction state in which the element of the specimen 20 elutes into the CO ₂ saturated solution 41 is reproduced in the storage container 10 in a temperature environment where CO ₂ underground storage is assumed, and this CO ₂ saturated solution is obtained. 41 can be collected.

The state of CO ₂ underground storage will be described based on FIG.

As shown in FIG. 2, a vertical hole 101 (boring hole) that penetrates the impermeable layer 102 from the ground surface and reaches the aquifer 100 is excavated, and a pumping device 103 that pumps CO ₂ into the vertical hole 101 is installed on the ground. Has been. The aquifer 100 is a formation in which groundwater exists, and a CO ₂ saturated solution is pumped and stored in the aquifer 100 by the pumping device 103, and outflow to the ground is prevented by the impermeable layer 102.

For example, when CO ₂ discharged from a factory or a power plant is pumped from the vertical hole 101 to the aquifer 100 by the pumping device 103, the CO ₂ is dissolved in the groundwater to generate a CO ₂ solution that is an acidic solution. Then, after stopping the pumping of CO _2, CO ₂ saturation solubility solution gradually penetrates the aquifer 100, for example, it affects the rock 104 over a wide range around the vertical hole 101 of the aquifer 100. Specifically, typical elements constituting rocks such as sodium (Na) and calcium (Ca), cadmium (Cd), boron (B), lead (Pb), arsenic (As), selenium (Se), fluorine Elements other than rare gases, such as transition metals such as (F), elute from the rock 104 into the CO ₂ solution (reaction solution).

The temperature of the rock 104 varies depending on the location where CO ₂ is stored underground, and the pressure applied to the rock 104 varies depending on the depth of the aquifer 100. The above-described apparatus for collecting elements eluted from rock reproduces the temperature and pressure that vary depending on the actual environment and immerses the CO ₂ saturated solution in the specimen 20 (see FIG. 1). The chemical reaction that elutes into the CO ₂ saturated solution is accurately reproduced by the specimen 20 of the storage container 10 according to the actual environment, and the CO ₂ saturated solution in which the elements are dissolved is collected.

Elution element sampling device from rocks according to the present embodiment, after immersing for a period of time CO ₂ saturation solubility solution specimen 20, CO ₂ saturation solubility solution taken from the container 10, CO in a variety of analytical methods the elements are eluted into ₂ saturation solubility solution can be measured. For example, by analyzing over the ions dissolved in the CO ₂ saturated lysis solution after immersion of CO ₂ saturated dissolved solution at a predetermined temperature and pressure conditions over a period of time to determine the elution ease and extent of the elements be able to.

Furthermore, such examination can also confirm that the above-mentioned elements were eluted by collecting groundwater by drilling into the aquifer 100 actually stored and analyzing the collected groundwater. However, such boring excavation also causes the release of CO ₂ stored underground, which is not appropriate. By using the device for collecting elements eluted from rocks of the present invention, it is possible to know what elements may be eluted under the influence of CO ₂ before CO ₂ underground storage. It is possible to study the method of retaining elements and to identify elements to be monitored with particular care, leading to significant cost reductions.

In the embodiment example described above, the CO ₂ assuming real environment for storing underground, but was immersed specimens 20 to CO ₂ saturation solubility solution, only to assume an environment of CO ₂ geological storage However, it is also useful to find the source of contamination by immersing an actual solution in the rock that is actually a problem as one of the methods for investigating the cause of groundwater contamination.

Although the elution element collection device from the rock having the above-described configuration has been described with an example in which a CO ₂ dissolving solution is assumed as a solution, the solution for dissolving CO ₂ should be ground water having the same quality as the ground water contained in the actual formation. Can do. In other words, the device for collecting elements eluted from rocks can also reproduce the environment corresponding to the actual environment in which CO ₂ is stored in a formation filled with a salt solution such as under the seabed. Furthermore, it is possible to target an actual natural phenomenon such as a chemical weathering environment in which acid rain is assumed as a solution and elements are eluted from rocks by acid rain. In this case, in accordance with the real environment, for setting the pressure on the temperature and the specimen 20 has been specimen 20 housed in the reaction vessel 10, in consideration of the influence of vigorous changes temperature and CO ₂ concentration at the surface It is possible to collect elements that elute from rocks, and to reproduce natural phenomena with high accuracy according to the actual environment.

This has a mechanism in which the temperature control device 51 does not always keep the temperature constant but arbitrarily increases or decreases by program control, and varies depending on the period during which the specimen 20 is immersed in the CO ₂ saturated solution. It is possible to make it. For example, by reducing the temperature and reproducing the domestic winter temperature, and increasing the temperature and reproducing the domestic summer temperature, it simulates repeated temperature changes that are heated by sunlight in the day and decrease in temperature at night. It is possible to reproduce the year-round underground environment on the surface. In various regions, it is possible to reproduce the elution of an element from the specimen 20 in accordance with a more realistic underground environment and collect a CO ₂ saturated solution in which this element is dissolved.

Furthermore, CO ₂ gas tank 30, the temperature of CO ₂ saturated dissolved solution container 10 may be heated alone to be set in advance to a temperature of CO ₂ saturation solubility solution present in the underground environment. Even in this case, the elution of the element from the specimen 20 in accordance with the actual underground environment is reproduced, and a CO ₂ saturated solution in which this element is dissolved can be collected.

<Another embodiment>
In the above-described embodiment, the single storage container 10 is used to immerse the rock in the CO ₂ solution, but the present invention is not limited to such a form. FIG. 3 is an overall configuration diagram of a device for collecting eluted elements from rocks according to another embodiment. In addition, the same code | symbol is attached | subjected to the same thing as the above-mentioned embodiment example, and the overlapping description is abbreviate | omitted.

As shown in FIG. 3, the specimen 20 is accommodated in each of the two storage containers 10 and 10A. A CO ₂ gas tank 30 is connected to one storage container 10 as in the first embodiment, and a distilled water tank 30A is connected to the other storage container 10A. Distilled water is stored in the distilled water tank 30A, and the distilled water 41A can be supplied into the storage container 10A.

In the eluting element collection device having such a configuration, the storage containers 10 and 10A are both controlled to the same temperature by the temperature control device 51, and a predetermined pressure is applied. Therefore, the specimen 20 stored in the storage container 10 is immersed in the CO ₂ saturated solution 41, and the specimen 20A stored in the storage container 10A is immersed in distilled water 41A. That is, a change with a solution containing a CO _2, can be compared with a solution containing no CO _2, CO ₂ solution can be evaluated the effect on the rock.

As described above, the rock elution element collection apparatus of the present invention includes a plurality of storage containers, one of which contains the specimen immersed in a solution containing carbon dioxide, and the other storage container contains carbon dioxide. By immersing the specimen in a solution that does not, the influence of carbon dioxide on the specimen can be investigated in more detail. In particular, in order to estimate the toxic elements eluted from the rock 104 under the influence of CO ₂ saturated lysis solution, experiments relating to the dissolution element sampling device from the rock, to prepare a solution containing no CO ₂ for comparison, the same conditions In the same experiment, the specimen 20 is immersed in the solution. By performing such comparison, experiment and analysis, it can be clarified by directly comparing whether or not the storage of CO ₂ has an effect on the elements eluted in the groundwater.

  In addition, you may set different temperature to each storage container 10 * 10A. For example, the storage container 10 can be set to a relatively low temperature, and the storage container 10A can be set to a relatively high temperature. Thereby, various underground temperature environments can be simulated more flexibly.

  INDUSTRIAL APPLICATION This invention can be utilized in the industrial field | area of the sampling device which verifies reaction when an acidic solution is immersed in a rock.

It is a whole block diagram of the elution element extraction device from the rock concerning one example of the present invention. CO ₂ is a schematic cross-sectional view of a state of being stored in the basement. It is a whole block diagram of the eluting element extraction apparatus from the rock which concerns on the other embodiment of this invention.

Explanation of symbols

10 container 11 lid 12 fixed member 13 the ring 14 a pressure gauge 15 stirrer 16 mesh stand 20 specimen 30 carbon dioxide (CO ₂₎ gas tank 31 the pipe 32 valves 40 carbon dioxide (CO ₂₎ gas 41 carbon dioxide (CO ₂₎ saturated Dissolved solution 50 Heater 51 Temperature control device 100 Aquifer 101 Vertical hole 102 Impermeable layer 103 Pumping device 104 Rock

Claims (3)

A storage container in which a solution for immersing rocks is stored;
A blocking means for blocking the solution stored in the storage container from the outside of the storage container;
A device for collecting eluted elements from rock, comprising: a collecting means for collecting the reaction solution in which the rock is immersed from the storage container. In the elution element collection device from the rock according to claim 1,
A temperature control means for setting a temperature of a solution for immersing the rock stored in the storage container;
The temperature control means arbitrarily sets the temperature of a solution for immersing the rock stored in the storage container according to the environment, and a device for collecting eluted elements from rock. In the eluting element collection device from the rock according to claim 1 or 2,
The rocks were collected from the strata where carbon dioxide is planned to be stored underground and the surrounding strata to investigate the effects of carbon dioxide stored on the ground on the human living environment. A device for collecting eluted elements from rocks.

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