JP2007268511A - Iron ion eluting body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive iron ion eluate which can efficiently elute iron ions sustainably at a given rate for a long period of time. <P>SOLUTION: Upon immersion in water, the iron ion eluate produces divalent iron ions in water. The iron ion eluate is produced by mixing powdery iron and carbon with a water-soluble binder such as starch glue, hardening the mixture to prepare a number of small masses, forming the small masses into a solid plate with the aid of a nonaqueous binder such as clay powder. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an iron ion eluent that generates iron ions in water by being immersed in water, and is applied to water used in water tanks, rivers, ponds, lakes, seas, baths, water pipes, and the like. Related to the iron ion eluate.

As a conventional iron ion eluent of this type, the hollow portion of the cellular concrete reef body is filled with a mixture of iron and a metal having a higher electric potential than iron, for example, graphite, charcoal such as activated carbon, and submerged in seawater. For example, a technique in which iron ions are eluted is disclosed (see, for example, Patent Document 1).
Japanese Patent Application No. 6-20804 (Specification (3), FIG. 1)

  However, in the above-described conventional example, the structure in which the mixture of iron and carbon is simply filled in the hollow part of the cellular reef body made of aerated concrete, the first inner part is in the part where the iron and carbon are in contact. The iron ions are eluted, but when the iron becomes smaller due to the elution of iron ions, the contact with the carbon is released. Then, a hard oxide film is formed on the surface of the iron, and the iron ions are efficiently used thereafter. As the elution is stopped, the separated iron flows out of the hollow portion by an ocean current or the like and becomes a state of iron alone. Thus, there is a problem that efficient elution of iron ions cannot be continued.

  The present invention has been made in order to solve such conventional problems, and an object of the present invention is to provide inexpensive iron ions that can maintain elution of iron ions constantly over a long period of time. It is to provide an eluate.

As a means for achieving the above object, the iron ion eluting body according to claim 1 is an iron ion eluting body that generates iron ions in water by being immersed in water, wherein iron and charcoal are dissolved in water. A large number of small lumps mixed and hardened together with a water-soluble binder are hardened with a water-insoluble binder and formed into a predetermined shape.
As a means.

  The iron ion eluting body according to claim 4, wherein the iron ion eluting body according to any one of claims 1 to 3, wherein the iron ion eluting body has a plate shape. .

  In the iron ion eluate according to claim 1 of the present invention, as described above, a large number of small lumps obtained by mixing iron and charcoal with a water-soluble binder and solidifying them are solidified with a water-insoluble binder and formed into a predetermined shape. As a result, when the water is immersed in water, iron and charcoal come into contact with the small particles that come into contact with water due to the gradual dissolution of the water-soluble binder. Iron, which is a metal with a lower degree and / or lower potential, is oxidized and elutes iron ions.

  And since the contact state of charcoal and iron is maintained, a local battery is made, and since an oxide film is not formed on the surface of iron, iron ions are continuously eluted until iron is not oxidized. be able to.

  Further, as the water-soluble binder dissolves, the charcoal and iron come into contact with each other and the iron ions are eluted, so that the iron ions can be eluted continuously until all the iron is used up.

Iron ions not only serve as food for phytoplankton at the top of the food chain in the water, but also consume carbon dioxide (CO ₂ ) in the photosynthesis of phytoplankton, and at the same time, reduce the sludge by the growth and activity of aquatic organisms. I discovered that it works to purify.

In addition, when all water-soluble binders are dissolved, all small lumps of the iron ion eluate become a hollow porous state, which becomes a hotbed for underwater microorganisms and a breeding ground for plant roots. It will be used effectively without waste until the end.
The remaining charcoal is useful for water purification.

  In the iron ion eluting body according to claim 4, as described above, the shape of the iron ion eluting body is plate-like, so that the iron ion eluting body sinks into the mud and sludge accumulated on the bottom of the sea or river. In addition to being able to suppress this, it is possible to improve the placement property without being influenced by ocean currents, tides, water currents, and the like.

Hereinafter, embodiments of the present invention will be described in detail.

  First, the structure of the iron ion eluting body of this embodiment will be described.

  That is, the iron ion eluting body of this embodiment is an iron ion eluting body that generates iron ions in water by being immersed in water, and is in the form of powder or granular iron (Fe) and charcoal (C). A large number of small lumps obtained by mixing and solidifying with a water-soluble binder are hardened with a water-insoluble binder and formed into a plate shape.

More specifically, as the powdered iron, fine powdered iron powder, crushed alloyed iron powder, iron casting powder, or the like is used.
Further, as the pulverized coal, coke powder, graphite powder, charcoal powder, bamboo charcoal powder, coal powder, or the like is used.

As the water-soluble binder, powders such as glue, corn, dextrin, rice bran and rice are used in addition to PVA and starch paste.
In addition, as the water-insoluble binder, inorganic binders such as clay powder and cement powder are used.

Next, an example of the manufacturing method of the iron ion eluting body of an Example is demonstrated.
First, a thin solution in which starch paste is dissolved in iron powder and charcoal powder is added little by little to humidify, and this is mixed well and granulated into a large number of small chunks.

  Next, after adding clay powder to this granulated small lump and kneading and mixing, the clay powder is coated on the surface of the small lump by gradually adding water and kneading well. This is put into a press mold and formed into a plate shape.

  Next, the iron ion eluate formed into a plate shape is dried by sun drying or heat and solidified.

  Next, the operation and effect of this embodiment will be described.

As described above, the iron ion eluting body of this example is formed into a plate shape by solidifying a large number of small lumps obtained by mixing iron and charcoal with a water-soluble binder and solidifying with a water-insoluble binder. As a result, when this is immersed in water, the water-soluble binder gradually dissolves in the small lump in contact with water, so that iron and charcoal come into contact with each other to form a local battery. Iron (Fe), which is a metal having a lower electronegativity and / or a lower electric potential than that, is oxidized, and iron ions (Fe ²⁺ ) are eluted.

And since an oxide film is not formed in the iron surface by maintaining the contact state of charcoal and iron, iron ions can be continuously eluted until iron is not oxidized.
At that time, carbon dioxide and iron dissolved in water can be immobilized as metal carbonate by using water as a reaction medium. The chemical formula is
M (metal) + nH ⁺ → M ^{n +} + (n / 2) H ₂ ↑
CO ₂ + H ₂ O → H ₂ CO ₃ → H ⁺ + HCO ₃ ⁻ → 2H ⁺ + CO ₃ ²⁻ →
H ⁺ + HCO ₃ ⁻ → H ₂ CO ₃ → CO ₂ + H ₂ O
M + (n / 2) CO ₂ + (n / 2) H ₂ O → M (CO ₃ ) _{N / 2} + (n / 2) H ₂
Therefore, Fe + CO ₂ + H ₂ O → FeCO ₃ + H ₂ ↑...

  Further, as the water-soluble binder dissolves, the charcoal and iron come into contact with each other and the iron ions are eluted, so that the iron ions can be eluted continuously until all the iron is used up.

In addition, iron ions not only feed on phytoplankton at the top of the food chain in the water, but also consume carbon dioxide (CO ₂ ) in the photosynthesis of phytoplankton, while at the same time reducing the sludge by the growth and activity of aquatic organisms. I discovered that it works to purify.

In addition, when all water-soluble binders are dissolved, all small lumps of the iron ion eluate become a hollow porous state, which becomes a hotbed for underwater microorganisms and a breeding ground for plant roots. It will be used effectively without waste until the end.
The remaining charcoal is useful for water purification.

  In addition, the shape of the iron ion eluting body is plate-shaped, so that it can be prevented from sinking and being buried in mud and sludge accumulated on the bottom of the sea and rivers, and the flow of ocean currents and tides can be suppressed. It is possible to improve the placement property without being influenced by pulling, water flow or the like.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and design changes and the like within a scope not departing from the gist of the invention are also included in the present invention.
For example, in the embodiment, it is formed into a plate shape, but the shape is arbitrary.

Moreover, as iron and charcoal, in addition to powder, those having a predetermined shape such as particles can be used.

Claims (4)

An iron ion eluent that generates iron ions in water by being immersed in water,
An iron ion eluent characterized in that a large number of small blocks obtained by mixing iron and charcoal together with a water-soluble binder and solidifying them with a water-insoluble binder are molded into a predetermined shape.   The iron ion eluting body according to claim 1, wherein the iron is powdery or granular.   The iron ion eluate according to claim 1 or 2, wherein the charcoal is powdery or granular. The iron ion eluting body according to any one of claims 1 to 3, wherein the iron ion eluting body is formed in a plate shape.