JP2898189B2 - Method for producing hydrogen and high-purity iron using waste metal processing materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing hydrogen and high-purity electrolytic iron from waste iron generated when cutting or polishing metal.

[0002]

2. Description of the Related Art It is said that iron accounts for 90% or more of metals used in various fields. As long as machining is continued, scrap iron waste is generated. On the other hand, in recent years, a recycling law has been enacted, and attention has been paid to resource reuse. However, the drop in iron scrap prices has made it increasingly difficult for recyclers to recycle waste iron. Also in companies, the disposal cost of waste iron has increased, which has become a major problem.

[0003] Under such circumstances, conventional waste iron has been pressed together to produce solid waste iron, which has been melted in a furnace to re-produce iron. Also in recent years, iron alloys obtained by adding various metals to steel materials have increased in recent years, and phenomena that cannot be dealt with due to types, mass costs, etc. have occurred, and recycling has become difficult year by year. As described above, the conventional technology alone has many disadvantages in terms of social needs, profitability, throughput, and the like.

[0004]

SUMMARY OF THE INVENTION The present inventor has paid attention to the fact that waste iron is electrolyzed into high-purity electrolytic iron and effectively reused as a high-value-added metal. A technique for electrolyzing metal to obtain high-purity iron is described in Japanese Patent Publication No. 3-53394. The method of producing electrolytic iron described in this publication is to connect iron of a predetermined shape to an anode and deposit high-purity electrolytic iron on a cathode. However, in the production method described in this publication, it is difficult to rapidly dissolve the raw material iron to be connected to the anode in the acid solution, and it is not possible to increase the production per hour. When a high current is applied in a state in which the raw material iron cannot be sufficiently dissolved, ferrous ions contained in the solution become ferric ions. In order to produce high-purity electrolytic iron, the solution must be ferrous ion. This is because, when the ferric ion is used, the solution becomes turbid in reddish brown and high-purity iron cannot be precipitated.

[0005] Waste iron, which is a waste material of metal working, is huge. Therefore, even in the case of high value-added electrolytic iron, it is not actually used in a method with a small processing capacity.
Further, the method for producing electrolytic iron described in this publication has a drawback that the raw material iron has a predetermined shape, so that the raw material cost is high and the production price of the electrolytic iron to be produced is high.

Further, Japanese Patent Publication No. 53-28156 discloses a method of recovering iron by electrolyzing waste acid obtained by pickling iron and steel. Iron ions contained in large amounts in waste acid,
It is a method to recover by electrolysis. According to this method, iron contained in waste acid can be recovered and used effectively, but waste iron which is a waste material of metal processing cannot be made into high-purity electrolytic iron.

Further, a technique for dissolving iron in an acid solution to generate hydrogen has been developed. However, in order to dissolve a large amount of iron in an acid solution in a short time, it is necessary to cut iron into small pieces. This is because it takes time to dissolve large massive iron. For this reason, this method has the drawbacks that the processing is troublesome and the material cost is high.

Further, as a method of producing hydrogen, there is a method of electrolyzing water. This method requires a very large amount of electricity. This is because electricity is supplied to water to turn positive hydrogen ions into hydrogen gas. Producing 22.4 liters (1 atm) of hydrogen gas requires as much as 96500 coulombs of electricity. Therefore, it is difficult for this method to reduce the production cost of hydrogen.

The present invention has been developed to solve the various problems of these conventional methods. An important object of the present invention is to dispose of waste iron that has no value other than discarding until now. In addition to the production of hydrogen as a raw material, a metal processing solution that can efficiently use and efficiently process enormous amounts of waste iron by producing high-purity electrolytic iron by electrolyzing a solution in which waste iron is dissolved. An object of the present invention is to provide a method for producing hydrogen and high-purity iron using waste materials.

[0010]

DISCLOSURE OF THE INVENTION Waste material for metal working according to the present invention
The method for producing hydrogen and high-purity iron using
To achieve this, hydrogen and high-purity iron are
To manufacture. That is, in the present invention, a metal as a raw material is converted into an acid solution.
Improved method for producing hydrogen by dissolving in water
Is a waste material of metal processing,Powder or linear
Waste iron 2BAnd block waste iron2AUsepowder
Or linear waste iron 2BIs a separate bath from the electrolytic bath
Hydrogen generated by dissolving in an acid solution in a tank is recovered.Powder or
Is a linear waste iron 2BIs dissolved in the dissolution tank1
From electrolyzer4Is transferred to Block-shaped waste iron2A
Is the anode anode6ATo the solution 3 of the electrolytic cell 4
Replenish with iron ionsLysis solution 3Electrolyze
To deposit electrolytic iron on the negative electrode 5.

[0011]

The method for producing hydrogen and high-purity iron of the present invention comprises:
In this method, waste iron from metal processing, which is difficult to recycle, is used as a raw material and is dissolved in an acid solution. Waste iron, which is a waste material of metal processing, includes powdered or linear waste iron and block-shaped waste iron. Powdered or linear waste iron
Since is a scrap of metal, it is quickly dissolved in an acid solution in the form of a powder or an elongated line. When the waste iron is dissolved in the acid solution, hydrogen and metal salts are formed. For example, if the acid solution is sulfuric acid with respect to waste iron, it reacts according to the following reaction formula to generate hydrogen. _{Fe + H 2 S0 4 → H} 2 + F
eSO ₄ As shown in this reaction formula, when 1 mol of iron is dissolved in sulfuric acid, 1 mol of hydrogen is generated.

The method according to the present invention uses waste iron, which is a waste material of metal processing, as a raw material, and effectively reuses low-quality waste iron that has been conventionally discarded as high-purity electrolytic iron. To recover the hydrogen generated in Waste metal processing
Has ideal physical properties as a raw material for electrolytic iron. Although it contains various impurities, it becomes high-purity electrolytic iron when electrolyzed. Furthermore, it has an ideal shape that is easily dissolved in an acid solution without special processing. In order to efficiently produce high-purity electrolytic iron, it is important to rapidly dissolve the raw metal. In the conventional method, in order to rapidly dissolve the raw material metal, it is necessary to cut the raw material metal to increase the surface area with respect to the weight. This leads to high pre-processing costs. Advantageously, the waste iron used in the process of the present invention is a waste material already processed from metal, and thus has a shape that is easily dissolved in an acid solution without special cutting treatment.

[0013] The conventional method of discarding metal waste material has a drawback that the waste iron has such a shape, that is, a bulky shape, and increases the cost of disposal. This is because special processing such as pressing to harden the sheet is required. The bulkiness of the waste iron is an extremely excellent feature in the production method according to the present invention in that the iron is rapidly dissolved in an acid solution to increase the processing capacity. As described above, the method according to the present invention makes effective use of the drawbacks that have been detrimental to the conventional waste treatment method, and makes it possible to use high value-added hydrogen and Is effectively reused.

The reason why it is important to rapidly dissolve the raw material metal in the acid solution is to efficiently treat a huge amount of waste iron. Furthermore, this is important in order to make the iron ions contained in the solution into ferrous ions instead of ferric ions. As waste iron is dissolved and electrolysis is promoted, useful divalent ferrous ions in the solution become trivalent ferric ions harmful to electrolytic iron production by air oxidation or anodic oxidation. . In addition, the first
When iron ions decrease, the quality of electrolytic iron deteriorates. This adverse effect can be prevented by using an iron material for the anode. This is because oxidation can be prevented by dissolving the anodic iron and supplying ferrous ions. However, in the method of dissolving anodic iron, replenishment of ferrous ions is very small. For this reason, in order to keep the ferrous ion concentration of the solution constant, it is necessary to reduce the current density and to reduce the amount of electrolytic iron deposited. This means that large amounts of waste iron cannot be treated efficiently.

The method according to the present invention prevents this problem by connecting the block-shaped waste iron to the anode and dissolving it in the solution. The block-shaped waste iron is not immediately dissolved in the dissolving solution as it is, but is quickly dissolved in the dissolving solution by being connected to the anode and energized, and ferrous ions are converted to ferric ions. Prevent from becoming. Therefore, a large amount of electrolytic iron can be efficiently produced by electrolysis with a large current.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate a method for embodying the technical idea of the present invention, and the present invention does not specify a method for producing hydrogen and high-purity iron as follows.

Hereinafter, a specific example of treating the largest amount of waste iron as metal processing waste will be described in detail.

FIG. 1 shows an apparatus for producing a high-purity metal used in an embodiment of the present invention. The apparatus of this figure, a dissolving tank 1 for collecting the hydrogen with dissolving the powdered or linear waste iron 2B is a scrap metalworking acid solution, powder or the dissolving tank 1
A supply means 8 for supplying the linear waste iron 2B, the recovery means 14 for recovering the hydrogen generated in the dissolution tank 1, the powder in the dissolution tank 1
Or a transfer means 9 for transferring the solution 3 in which the linear waste iron 2B is dissolved to the electrolytic cell 4, and electrolysis of the solution 3 supplied from the transfer means 9 to deposit metal on the surface of the negative electrode 5. An electrolytic cell 4, a reflux means 7 for refluxing the solution 3 in the electrolytic tank 4 to the dissolving tank 1, and an acid liquid for supplying an acid solution to the dissolving tank 1 and the electrolytic tank 4 to maintain the pH at a predetermined value. Supply means 15 .

The supply means 8 comprises powdered or linear waste iron 2B
8A storing powder and powder or linear hopper 8A
And a rotary feeder 8B for transferring the waste iron 2B to the melting tank 1. The rotary feeder 8B is controlled by the control means 10 for measuring the metal ion concentration in the melting tank 1 to control the metal ion concentration in the melting tank 1 to a set value.
Rotary feeder 8B is powdered or linear waste iron 2B
Is supplied to the dissolving tank 1, the metal ion concentration of the dissolving solution 3 increases.

The control means 10 operates the rotary feeder 8B when the concentration of metal ions in the melting tank 1 becomes lower than the set value. When the metal ion concentration becomes higher than the set value, the operation of the rotary feeder 8B is stopped. Control means 1
0 is connected to a sensor (not shown) for detecting the metal ion concentration of the solution 3. A sensor for measuring the conductivity of the solution 3 can be used as the metal ion concentration sensor. This is because the higher the metal ion concentration, the higher the conductivity of the solution 3. The control means 10 shown in FIG. 1 also controls the heater 11A for heating the solution 3. The heater 11A heats the dissolving solution 3 to remove the powdered or linear waste iron 2
B is easily melted. However, powdered or linear waste iron 2B
When dissolved in sulfuric acid, heat is generated, so that the heater 11A does not need to constantly heat the solution 3. When the temperature of the solution 3 reaches the set value, the control means 10 stops the energization of the heater 11A.

The dissolving tank 1 is used for defatted powder or linear waste.
A tank for dissolving iron 2B in an acid solution and recovering hydrogen and dissolving powdered or linear waste iron 2B.
And a filtration tank 1B is connected to the main body tank 1A.
A strong acid such as sulfuric acid, hydrochloric acid or nitric acid can be used as the acid solution to be put into the main tank 1A, but sulfuric acid is most suitable. This is because hydrochloric acid generates chlorine and nitric acid generates nitric oxide. Main unit tank 1
A is hermetically sealed in order to recover generated hydrogen.

The filtration tank 1B filters the solution 3 of the main body layer 1A with a filter 12, and stores the solution 3 that has passed through the filter 12. The filter 12 is connected to the suction side of the supply pump 16. The filter 12 is a porous tube built in a watertightly closed casing and removes carbon, silicon, and the like that are not dissolved in the acid solution, and removes solid matter mixed in the solution 3.

The recovering means 14 recovers and stores hydrogen generated in the dissolving tank. The recovering means 14 includes a pressurizing pump 14A connected to the main body tank having a closed structure, and a hydrogen storing pressurized hydrogen supplied from the pressurizing pump 14A. And a tank 14B.

The transfer means 9 is a pump for transferring the solution 3 stored in the filtration tank 1B to the electrolytic tank 4. The pump supplies the solution 3 having a high metal ion concentration from the filtration tank 1B to the electrolytic tank 4B.
To maintain the metal ion concentration in the electrolytic cell 4 at a high concentration.

The electrolytic cell 4 has a negative electrode 5 in the center and positive electrodes on both sides thereof. -The electrode 5 is a conductive metal plate. The electrode 5, which is a metal plate, has a mirror-finished surface so that high-purity iron deposited on the surface can be easily peeled off.
-A stainless plate is used for the electrode 5. Instead of a stainless steel plate, a titanium plate or a copper plate can also be used. The dissolving solution 3 is supplied by the transfer means 9 to the vicinity of the stainless steel plate which is the electrode 5. The positive electrode 6 is an anode anode made of a conductive metal in the form of a cage and is filled with waste iron. Anode The anode 6A is electrically connected to the waste iron. The waste iron energized via the anode 6A replenishes the solution 3 with ferrous ions. The waste iron put into the anode 6A is a block of waste iron 2A. Anode anode 6
This is because electric contact with A is good.

The electrolytic cell 4 has a built-in heater 11B. The heater 11B heats the solution 3 in the electrolytic cell 4 to a predetermined temperature. In the heated solution 3, the mobility of ions is improved and the electric resistance is reduced. Therefore, a large current can be made to flow by lowering the electrode voltage, and power can be used effectively.

The concentration of metal ions in the solution 3 in the electrolytic cell 4 decreases as the electrolysis proceeds. The reflux means 7
With the transfer pump to the dissolving tank 1, the dissolving solution 3 having the reduced metal ion concentration is transferred to the dissolving tank 1. In the apparatus shown in FIG. 1, the pump of the reflux means 7 and the pump of the transfer means 9 are continuously operated, and the solution 3 having a high metal ion concentration is electrolyzed from the dissolving tank 1 to the electrolytic tank 4, and the solution 3 having a low metal ion concentration is electrolyzed. Dissolution tank 1 from tank 4
Circulates.

The acid solution supply means 15 includes the electrolytic tank 4 and the main tank 1.
A is supplied with sulfuric acid to maintain the pH at the set value. A pH sensor for detecting pH is provided in the electrolytic cell 4 and the main tank 1A. The pH is set to a set value by detecting the pH with a pH sensor and adjusting the amount of sulfuric acid to be supplied.

A method for collecting high-purity electrolytic iron from waste metal processing using the apparatus shown in FIG. 1 will be described with reference to the flowchart of FIG. Waste iron is a waste of metalworking, comprising a linear cuttings in powdered abrasive debris iron powder or flakes
Powder or linear waste iron 2B and block-shaped waste iron 2A
Use Degreasing Step ((1) in FIG. 2) When depositing a metal on the cathode using the electrolysis method, it is not preferable that the solution 3 is stained with oil. In order to prevent the dissolution solution 3 from being stained, the waste iron as a raw material is washed in advance. If the waste iron is water-soluble, wash the waste iron with water. Waste iron of non-water-soluble dirt is alkaline degreasing,
Or clean with acetone. Step of recovering hydrogen by chemically dissolving in acid solution ((2) in FIG. 2) The acid solution (sulfuric acid or hydrochloric acid) in main tank 1A of dissolution tank 1 may be at room temperature,
Preferably, it is heated to 60C to 70C. This is to increase the solubility of waste iron. When the powdered or linear waste iron 2B is dissolved in the acid solution, hydrogen is generated and a high concentration solution 3 containing ferrous ions is obtained. Hydrogen is stored in the hydrogen tank 14B by the recovery means 14. The solution 3 containing a high concentration of ferrous ions is electrolyzed at a large current density to efficiently turn into electrolytic iron. The powdered or linear waste iron 2B is dissolved by the acid solution contained in the main body tank 1A of the melting tank 1. In the main body tank 1A, powder or linear waste iron powder or flake waste iron is supplied by the supply means 8.
Abandoned iron 2B is charged . Injected powder or linear waste
The iron 2B is dissolved in the acid solution to increase the metal ion concentration of the solution 3. The hydrogen generated in this step is stored in the hydrogen tank 14
Collected by B. In our experiments, about 300 liters of hydrogen could be recovered with 1 kg of waste iron. The gas generated in this step was analyzed by gas chromatography, and the results are as shown in Table 1.

[0030]

[Table 1] │ │ gas component │ hydrogen │ oxygen │ nitrogen │ carbon dioxide │ methane │ ├──── │ │Concentration (%) │97.5│0.22│0.74│ 0.61 │ 0.96 │ └─────┴──┴──┴ ──┴─────┴───┘

The solution 3 having a high metal ion concentration is filtered by the filter 12 and then sent to the electrolytic cell 4 by the transfer means 9. The solution 3 sent to the electrolytic cell 4 is electrolyzed to reduce metal ions. The solution 3 having a reduced metal ion concentration is returned to the main tank 1A by the reflux means 7. The circulating solution 3 is powdered or linear in the main tank 1A.
The waste iron 2B is dissolved and transferred to the electrolytic cell 4, and the dissolving solution 3 having a reduced metal ion concentration in the electrolytic tank 4 is circulated to the dissolving tank 1 so that the powdered or linear waste iron 2B is easily dissolved. Therefore, the dissolving solution 3 can be used efficiently, and the transfer means 9 and the reflux means 7 are continuously operated, so that the electrolytic cell 4 is always filled with high-concentration ferrous ions, so that electrolytic iron can be efficiently manufactured.

When the pH of the solution increases due to the progress of electrolysis in the electrolytic cell 4, the acid solution supply means 15 replenishes sulfuric acid to maintain the pH at a set value. The acid solution supply means 15 is provided with the p
H is preferably kept in the range 1.8 to 2.5.

Powder or linear waste supplied to the main tank 1A
棄鉄2B is machined iron powder debris, the surface area scrap such as chips increases, dissolved very rapidly to the acid solution in the main tank 1A. This is very important for rapidly dissolving a huge amount of waste iron . This is because the processing capacity per time can be increased. The powder or the linear waste iron 2B that is rapidly dissolved in the main body tank 1A generates a large amount of hydrogen and replenishes the electrolytic tank 4 with high-concentration ferrous ions.
This is an important point in the present invention in which a large amount of waste iron can be quickly processed.

Filtration Step (Step (3) in FIG. 2) The solution 3 in which the powdered or linear waste iron 2B is dissolved in the main tank 1A is filtered by the filter 12. This is for removing impurities such as insoluble carbon and silicon. The filter 12 can also remove the oxidized precipitate contained in the solution 3 sent from the electrolytic cell 4 by the reflux means 7. Further, the oxidized precipitate deposited on the filter 12 is redissolved in the dissolving solution 3 flowing down, reduced, and transferred to the electrolytic cell 4. The filtered solution 3 becomes a high-concentration iron sulfate solution. Filtration can be performed by primary and secondary filtration as required. Further, the solution 3 containing only ferrous ions can be obtained by ion exchange.

Step of Electrolyzing Dissolved Solution in Electrolyzer (Step (4) in FIG. 2) The electrodes of electrolyzer 4 are energized to electrolyze solution 3.
As the electrolysis proceeds, ferrous ions contained in the solution 3 precipitate on the surface of the negative electrode 5. The amount of iron deposited on the electrode 5 is proportional to the magnitude and time of the current flow; Theoretically, when 96500 coulombs of electricity are supplied,-
One gram equivalent of iron is deposited on the electrode 5.

As the electrolysis proceeds, ferrous iron, which is a useful divalent iron ion contained in the solution 3, becomes trivalent iron harmful to the production of electrolytic iron by air oxidation or anodic oxidation. It becomes ferric ion which is an ion. Furthermore, the ferrous ion contained in the solution 3 decreases, and the speed of producing electrolytic iron decreases. In order to replenish the electrolytic tank 4 with ferrous ions, solid iron scraps, which are block-shaped waste irons 2A, are put into the anode anode 6A of the positive electrode 6 and electrolyzed. The block-shaped waste iron 2A is brought into contact with the anode 6A and is energized, gradually dissolves in the solution 3 to replenish the ferrous ions, and prevents oxidation of the ferrous ions into ferric ions. I do.

The anode anode 6A is covered with an anode bag 13 in order to prevent carbon and the like contained in the block-shaped waste iron 2A put in the anode anode 6A from being mixed into the solution 3 to form slag. ing. As described above, the method of putting the block-shaped waste iron 2A into the anode 6A and performing the electrolysis has a feature that the block-shaped waste iron 2A can be effectively used. As the cathode, stainless steel is disposed between the anode and the anode on both sides, and electrolytic iron is deposited on both sides.

When the electrolytic cell 4 electrolyzes the solution 3,
When the temperature of the solution 3 is increased, the conductivity of the solution is improved, and the solubility of ferrous ions is also increased, so that a large amount of electrolytic iron can be deposited by electrolysis at a high current density. In particular,
The solution 3 is heated to about 50 to 90 ° C. by the heater 11B.

The step of transferring the low-concentration iron ion solution to the dissolving tank (see FIG. 2)
(Step (5)) This step is a step of treating while performing electrolysis in the electrolytic cell 4. As the electrolysis continues, the ferrous ion concentration decreases. The reflux means 7 sucks the solution 3 at the bottom of the electrolytic cell 4 and circulates the solution 3 in the solution tank 1. The waste iron is dissolved in the dissolving tank 1, and the iron sulfate solution sent from the electrolytic tank 4 to the dissolving tank 1 is regenerated. When the pH of the main body tank 1A increases in this step,
Acid solution supply means 15 replenishes sulfuric acid to maintain the pH at a set value.

Washing and Drying Steps (Steps (6) and (7) in FIG. 2) The obtained electrolytic iron is washed and dried to complete the production of the desired high-purity electrolytic iron.

When the waste iron was electrolyzed under the conditions shown in Table 2, high-purity electrolytic iron having the components shown in Table 3 could be produced.

[0042]

[Table 2]

[0043]

[Table 3]

In the above method, a solution containing high concentration metal ions obtained by dissolving waste iron is transferred from a dissolving tank to an electrolytic tank and electrolyzed. This method has a feature that the solution can be easily transferred to the electrolytic cell by a pump. However, it is also possible to dissolve waste iron in a dissolving solution, set the dissolving solution in a supersaturated state, precipitate a metal salt, and supply the metal salt to an electrolytic cell for electrolysis.

[0045]

The method of the present invention for producing hydrogen and high-purity iron using waste materials for metal processing realizes the following excellent features. The method of the present invention realizes the effective reuse of waste iron, which has been considered difficult to reuse in terms of cost, as extremely high value-added hydrogen and high-purity electrolytic iron. Despite the enactment of the Recycling Law, a huge amount of metal processing waste material is not being effectively used, and has become a major social problem. The production method of the present invention realizes an epoch-making feature that promotes recycling of waste iron, which was considered difficult to recycle economically, as high-use-value hydrogen and high-purity iron. By effectively using waste iron that was previously discarded,
The production method of the present invention, which uses highly valuable hydrogen and high-purity iron, makes it possible to save resources on a global scale, and is effective in realizing effective use of resources that will become increasingly important in the future. is there.

Furthermore, a remarkable feature of the present invention is that hydrogen and high-purity iron can be efficiently produced by effectively utilizing the physical properties of waste iron, which has been a drawback in the conventional disposal method. Waste materials generated when metal is processed are often bulky, such as powders such as polishing swarf, and flakes such as cutting chips, and are very bulky. This shape is an ideal shape for use as a raw material metal in the production method of the present invention. Powder of this shape or
This is because the linear waste iron is easily dissolved in the acid solution and can be rapidly dissolved without special processing. For efficient production of electrolytic iron, it is important to dissolve the raw material metal promptly. The raw material metal can be quickly melted by increasing the surface area with respect to the weight by reducing the size. In order to realize this, it is necessary to cut the raw material metal by the conventional method, and the pre-treatment is troublesome. However, the waste iron used in the production method of the present invention is a waste material obtained by processing a metal, and thus is processed into a shape that is easily dissolved in an acid solution without performing a special cutting process. The conventional method of discarding waste iron has a drawback in that the processing cost is increased due to the need for special treatment such as bulking due to this shape, pressing and compacting to harden. It is very preferable that the waste iron is bulky in the production method of the present invention because it can be rapidly dissolved in an acid solution. The production method of the present invention can efficiently produce high value-added hydrogen and electrolytic iron by effectively utilizing the conventional disadvantages.

Further, in the method for producing high-purity iron of the present invention, waste metal processing materials that have been discarded up to now are used as raw materials. Therefore, the cost of raw materials is significantly reduced, and hydrogen and high-purity iron are produced at low cost. Has the feature that it can be mass-produced. In particular, since the production method of the present invention uses waste iron as a raw material, it is possible to efficiently dissolve a large amount of waste iron, produce high-purity iron at a high current density, and increase the production amount per hour. The product cost can be reduced.

Further, the method for producing hydrogen and high-purity iron according to the present invention is characterized in that an enormous amount of powder,
In addition to being able to efficiently process linear waste iron to produce hydrogen and electrolytic iron, it has the feature that the purity of the produced electrolytic iron can be made extremely high. That is, when the production method of the present invention is powder or linear scrap iron which is easily dissolved in an acid solution .
The waste iron is dissolved in a dissolving tank that is a separate tank from the electrolytic tank, the solution dissolved in the dissolving tank is transferred to the electrolytic tank, and a block-shaped waste iron is connected to the anode of the electrolytic tank. This is because electrolytic iron is manufactured. A method of dissolving iron scraps in a dissolving tank that is a separate tank from the electrolytic tank and transferring the dissolving solution to the electrolytic tank is such that foreign substances other than iron, such as carbon and silicon, that are not dissolved in the acid solution are supplied to the electrolytic tank. Can be prevented. From the dissolving tank, a dissolving solution with less foreign substances is supplied to the electrolytic tank, and furthermore, since the electrolytic tank has a block-shaped waste iron connected to the anode anode, iron ions are supplied from the anode anode during electrolysis. In addition, it is possible to effectively prevent ferrous ions from becoming ferric ions. Furthermore, since the block-shaped waste iron is connected to the anode, the block-shaped waste iron can be effectively used as a raw material to produce high-purity electrolytic iron.

Therefore, the production method of the present invention can provide inexpensively hydrogen used as a fuel for clean energy and high-purity iron used as a research material and a raw material of products in the high-purity era, and can be used for research of advanced technology. It also contributes greatly to the development of products using clean energy and high-purity iron.

[Brief description of the drawings]

FIG. 1 is a schematic process diagram of an apparatus used in a manufacturing method of the present invention.

FIG. 2 is a flowchart of a process for producing hydrogen and high-purity iron by the production method of the present invention.

[Explanation of symbols]

1 ... Dissolution tank 1A ... Main body tank 1B ... Filtration tank 2A ... Block-shaped waste iron 2B ... Powder
Or linear waste iron 3 ... solution 4 ... electrolytic cell 5 ...-electrode 6 ... + electrode 6A ... anode anode 7 ... reflux means 8 ... supply means 8A ... hopper 8B ... rotary feeder 9 ... transfer means 10 ... control means 11A ... heater 11B ... heater 12 ... filter 13 ... anode bag 14 ... collection means 14A ... pressurizing pump 14B ...
Hydrogen tank 15 ... Acid solution supply means 16 ... Supply pump

Continuation of the front page (56) References JP-A-59-67326 (JP, A) JP-A-58-174531 (JP, A) JP-A-4-9490 (JP, A)

Claims (1)

(57) [Claims] 1. A by dissolving metal as a raw material in the acid solution in the method of manufacturing the electrolytic iron of hydrogen and high purity, the metal as a raw material, a scrap metal working, powder or
Both the linear waste iron (2B) and the block waste iron (2A) are used, and the powder or the linear waste iron (2B ) is separated from the electrolytic cell (4) by a closed structure that is a separate tank. Hydrogen generated by dissolving in the acid solution in the dissolving tank (1) is recovered, and the dissolving solution (3) in which powder or linear waste iron (2B) is dissolved is transferred from the dissolving tank (1) to the electrolytic tank. (4), and block-shaped waste iron (2A) is transferred to the anode (6) of the electrolytic cell (4).
Supplemented with iron ions in solution (3) of the electrolytic cell is electrically connected to A) (4), lysate (3) by electrolyzing an electrolytic cell (4), - the electrodes (5) A method for producing hydrogen and high-purity iron using waste metal processing, characterized by depositing electrolytic iron.