JPH0483531A - Air purifying composition and molded product - Google Patents

Abstract

PURPOSE:To obtain a composition having excellent air purifying effect by adding a polybasic oxyacid to a raw material based on FeO and Fe2O3 in a specific ratio to sufficiently react the same with the raw material. CONSTITUTION:A magnetite substance based on FeO and Fe2O3 is used as a raw material. A polybasic oxyacid such as ascorbic acid or citric acid is added to the magnetite substance in an amount of 0.5-10% by wt. of the total iron component of the magnetite substance and both of them are sufficiently reacted. The air purifying molded body thus obtained has excellent purifying effect and can be inexpensively prepared by utilizing blast furnace dust or sintered dust.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to harmful gases such as NOx, SOx, O, gas,
Purifies contaminated air containing nitrogen compound gases such as NH, sulfur compound gases such as H2S, carboxyl group gases such as acetaldehyde, carboxylic acid gases such as acetic acid, etc. The present invention relates to a composition that can be used as an air cleaning material or as a cleaning material for combustion exhaust gas and harmful gases. The composition of the present invention can also be used as a food freshness preserving agent.

[Prior art] NOx gas, SOx gas, and 03 gas in the air cause respiratory diseases, so it is desirable to reduce them, and various combustion devices, gas cleaning devices, and chemical systems are used to prevent or reduce their occurrence. A processing device is used. However, there is no method for efficiently removing these toxic gases from contaminated air using simple equipment.

Nitrogen compound gases and sulfur compound gases in the air are accompanied by bad odors, so they can be removed using adsorption methods using activated carbon, masking methods using other fragrances, and chemical methods that chemically react odor gases.
Odors are being treated. However, traditional deodorizers
There is a problem that the deodorizing power deteriorates in a short period of time.

The present inventors have invented a composition in which metals such as iron and manganese are brought into contact with ascorbic acid, etc., and the reaction products are made to coexist with unreacted iron, manganese, etc.
A patent application was filed under No. 76. This composition can be easily manufactured at low cost, and its air purifying power does not easily deteriorate even when used for a long period of time.

[Problems to be Solved by the Invention] The present inventors have further extensively studied the composition of Japanese Patent Application No. 1-280776 and have completed the present invention. That is, an object of the present invention is to provide a new air-purifying composition and a new air-purifying molded product that have an air-purifying effect equivalent to or even superior to the composition of Japanese Patent Application No. 1-280776.

[Means and effects for solving the problems] The air cleaning composition and air cleaning molded article of the present invention contain FeO and Fe2O.
3 as a main component. A raw material containing FeO and Fe2O3 as main components and further containing metallic iron is also used as a raw material in the present invention. In the present invention, these materials are collectively referred to as magnetite-based materials. Magnetite-based substances can also be used without problems even if they contain CaO, 5i02, etc. as impurities. Therefore, as the magnetite-based substance, artificial magnetite, magnetite, ferrite, etc. can be used. In addition, blast furnace dust, steelmaking dust, steelmaking slag, rolling scale, etc. are generated in a steelmaking factory, and these byproducts generated in a steelmaking factory can also be used as the magnetite-based material of the present invention. For example, converter dust generated when molten steel is oxygen-blown in a converter contains FeO: 40-70%, F
e2O,: 4-30%, metallic iron: 4-7%, CaO
: Although it has a composition of 1 to 8%, it is a preferable magnetite-based substance that has excellent reactivity with oxypolybasic acids, which will be described later, because it is in the form of a fine powder.

In the present invention, oxypolybasic acids are added to the magnetite-based material in an amount of 0.5 to 10% by weight based on the total iron content of the magnetite-based material, and the magnetite-based material and the oxypolybasic acids are reacted. The above 0.5 to 10% by weight of the oxypolybasic acids is an insufficient amount to chemically react the entire amount of the magnetite-based material. Therefore, the composition obtained by the above treatment is a composition in which the reaction product of iron oxide and oxypolybasic acids coexists with unreacted Fed, Fe2O, or even metallic iron. However, if the content of oxypolybasic acids is less than 0.5% by weight, the amount of the composition obtained by the reaction is small, and the air purifying power of the composition is low. Moreover, if the oxypolybasic acid content exceeds 10%, the composition obtained by the reaction will be covered by the excess oxypolybasic acid, and the air purifying power of the composition will be reduced.

In the present invention, the term oxypolybasic acids refers to ascorbic acid, an acid similar to ascorbic acid having an OH group and a COOH group, or a mixture of two or more of these acids. Examples of acids similar to ascorbic acid having an OH group and a COOH group include citric acid, gluconic acid, tartaric acid, tannic acid, gallic acid, and phthalocyanine.

The reaction between the magnetite-based substance and the oxypolybasic acid is achieved by mixing the magnetite-based substance with an aqueous solution of the oxypolybasic acid and stirring the mixture.

If the magnetite-based material contains an excess amount of CaO as an impurity, the magnetite-based material will exhibit alkalinity with a pH of 7 or higher; It is preferable to carry out a neutralization treatment using HCfl or )l, So, or the like.

In patent application No. 1-280776, Fe, Mn, AQ
, reaction products of metals such as Zn and oxypolybasic acids, and Fe, Mn.

Compositions in which metals such as Afl and Zn coexist, or compositions in which this composition is molded into a solid molded product and a base is further impregnated on this solid molded product are used as air purifiers. It is said that it has magical powers.

According to the new findings of the present inventors, as will be described later, the air purifying composition of the present invention obtained by reacting a magnetite-based substance with an oxypolybasic acid is
It has an air purifying power equal to or higher than that of the composition of No. 0776.

The air cleaning composition of the present invention contains unreacted Fed.

Contains Fe2O, Fe, etc. For example, if the air purifying composition of the present invention is continuously used in an air purifying device containing a large amount of odor gas, the air purifying power of the air purifying composition of the present invention will deteriorate; Since the air cleaning composition contains unreacted FeO, Fe, O, Fe, etc., the air cleaning composition of the present invention does not deteriorate, for example, by leaving it in the atmosphere or by heating and humidifying it. The air purifying power will be restored in a short time, and strong air purifying power will be restored.

The present inventors kneaded iron powder of 10μ or less and ascorbic acid of 2% by weight of the iron powder with water, and mixed this mixture into a urethane foam (100 mm x 10
A deodorizing filter of Japanese Patent Application No. 1-280776, which does not use iron oxide, was prepared by attaching the deodorizing filter to a filter (0 mm x loam) and using no iron oxide.

The present inventors also investigated dust generated during converter oxygen blowing (Fe
O: 6Qwt% $ Fe2O3,: 30wt%,
Fe: 6 wt%) and ascorbic acid of 2 wt% of the total iron powder of the generated dust are kneaded with water, and this mixed mixture is attached to the above urethane foam to form the filter-like air purifier of the present invention. Created.

Using the air cleaning external force test device shown in FIG. 1, using the above-mentioned product as a deodorizing filter, a gas containing 350 ppm of NH as a constant concentration gas was passed through the deodorizing filter in 5 QI minutes. The concentration of NH on the outlet side of the filter was measured. The results are shown in Figure 2.

As shown in FIG. 2, the air purifying body of the present invention is disclosed in Japanese Patent Application No.
It has 3 to 5 times more NH and cleaning power than No.-280776.

The reason why the air cleaning composition of the present invention has better NH and cleaning power than that of Japanese Patent Application No. 280776 is not clear, but the presence of FeO prevents the iron/ascorbic acid complex from drying out. This is thought to be due to the change from the conventional example described below to the example of the present invention, where more Fe terms, which serve as the core of coordination bonds, are created, and the number of Fe++ atoms to which Ni13 coordinates is increased.

The air freshening composition of the present invention also includes: It also exhibits stronger cleaning power against sulfur compound gases such as 11□S than the one disclosed in Japanese Patent Application No. 1-280776. Although the reason for this is not clear, one reason for this is that Fe2O contained in the air purifying composition of the present invention acts as a catalyst to decompose 11□S as described below. Minutes more l(
It is assumed that this is due to the addition of an action as a catalyst for decomposing S.

Fe2O3・3 TI, O+3H, 5-) Fe, S, +
6H,0Fe20.・3H,O+3H2S-+2FeS
+S +6H,0Fe25.・3H, O+3/20.
−+Fe2O,・3H,○+3S2FeS +3H20
+3/202→Fe2O! -3H20+2S As mentioned above, the air purifying composition of the present invention has superior air purifying power compared to that of Japanese Patent Application No. 1-280776 in the following points.

Since it contains FeO, it has a large absorption capacity for NH, etc.

ii, Fe2O, so it has a high ability to decompose sulfur compounds such as H and S.

iii, Fed, Fe2O3 or Fed,
Fe2O. The raw material containing Fe as a main component is a by-product of a steel mill, and can be easily and inexpensively obtained in the form of a fine powder. Therefore, the air cleaning composition can be produced at low cost.

The air purifying composition according to claim (3) of the present invention includes a magnetite-based substance containing 2% of the total iron powder of the magnetite-based substance.
O. After 5 to 10% by weight of oxypolybasic acids are added and the magnetite-based material and oxypolybasic acids are sufficiently reacted, a base is further allowed to coexist for production. C as a base
a(O)I)2. NaOH.

A commonly used base such as OH is added to Mg(OH)z + in an amount of, for example, 0.5 to 3% by weight based on the total iron content of the magnetite-based material. When a magnetite-based substance and an oxypolybasic acid are sufficiently reacted, the oxypolybasic acid is fully used up, so even if a base is present, the reaction will not occur actively.

According to the findings of the present inventors, by coexisting a base, the air purifying power against sulfur compound gases, acetaldehyde, etc. is further strengthened. It is assumed that this is because the coexistence of a base creates a reaction field that facilitates the decomposition reaction of these gases.

The air purifying compositions of claims (1) to (6) mentioned above are generally in the form of a slurry and may be used as they are, and when dried, they become powdered air purifying compositions. Become.

The air-cleaning molded article according to claim (7) is obtained by applying a slurry or powdered air-cleaning composition to an organic or inorganic carrier. Examples of carriers include urethane foam with three-dimensional communicating pores, foam beads, shirasu balloons, filter-like materials, zeolite,
Various shapes and materials such as non-woven fabrics, cloth-like materials, paper-like materials, etc. can be used. The air purifying composition can be applied to these carriers by immersing the carrier in a slurry of the air purifying composition or by spraying the air purifying composition. can.

If necessary, CMC,
Adding a binder such as ceramisol or PVA, or adding such a binder to a powdered air cleaning composition and applying it to a carrier together with the binder will make the application of the air cleaning composition stronger. I can do that.

In the air cleaning molded article according to claim 1 (8) of the present invention, Fe,
A carrier of one or more metals selected from Mn, ^Q, and Zn is used. The air cleaning power of the air cleaning composition of the present invention also decreases when a large amount of air is cleaned.

At this time, if Fe, Mn, AQ, and Zn are made to coexist with the air purifying composition, even if the air purifying power of the air purifying composition once decreases, the air purifying power will be restored in a short time, resulting in a strong air purifying composition. power is reproduced. Therefore, Fe, Mn, A I2,
When Zn is made to coexist with an air purifying composition as a carrier, recovery of air purifying power is promoted. As these metal carriers, metal molded products, metal secondary processed products, molded products made of hardened metal powder, sintered metal, etc. can be used. In addition, these metal carriers are non-metallic carriers, such as urethane foam having three-dimensional communicating holes, organic or inorganic nonwoven fabrics, paper-like materials, etc., which are plated or sprayed with these metals. You can.

[Example] The present inventors used the iron oxide byproducts generated in steel mills shown in B, C, and D in Table 1 as raw materials containing FeO, Fe2O3, and Fe as main components, and produced Basic acid was added at a weight ratio of (■) to the iron content of the raw material, water was added, and after kneading for 1 hour, it was applied to a urethane foam (100 mm x 100 mm x 10 nm) having three-dimensional communicating pores and dried to form a filter. An air purifying molded article of the present invention was prepared.

In Table 1, A is patent application No. 1-280 using iron powder as the raw material.
This is described in No. 776 and is a comparative example. Using the apparatus shown in Figure 1, these filters were fed with 350 ppm NH gas at 5Q/min, and after 10 minutes and 30 minutes from the filter outlet side
The concentration of NH was measured after 60 minutes and 100 minutes.

The results are shown in the NH3 deodorization test column of Table 1.

In addition, in Table 1, the NH3 deodorization retest column indicates the NH3 deodorization retest column for 100 minutes.
The filter used for deodorization was then left in the atmosphere for 2 hours, and the NH3 gas deodorization test was performed again, and the NH on the filter outlet side after 30 minutes was 9 degrees.

As seen in Table 1, air cleaning composition B of the present invention,
C has stronger deodorizing power against NH3 than Comparative Example A.

Furthermore, as shown in the deodorizing retest column, filters B and C of the present invention recover their deodorizing power and regenerate their strong deodorizing power when left in the atmosphere, similar to Comparative Example A. In Table 1, D is an example in which converter slag is used as a raw material, but converter slag has a total content of FeO, Fe2O3, and Fe of 23%, so its absorption capacity for NH and gas is not large.

We also used filters A-D in the same manner as above.
Then, spray a mixture of ethyl alcohol and Ca(OH)2 onto these filters to remove Ca(OH).
z coexisted. Using these filters, the first
With the equipment shown in the figure, H2S: 100pp+w gas is added to 5Q.
/ A similar test was conducted with separate flow. Filters B and C of the present invention have better H and S than filter A of the comparative example.
Shows gas removal performance.

[Effects of the Invention] The air cleaning composition and air cleaning molded product of the present invention have the following effects:
Compared to the product disclosed in Japanese Patent Application No. 1-280776, it can be manufactured at a lower cost and exhibits an air purifying power equal to or greater than that of the product disclosed in Japanese Patent Application No. 1-280776.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the 11 air purification test device, Figure 2 is
The figure which shows the example of NH3 gas cleaning power of the present invention example and a comparative example. It is. 1: Constant concentration gas, 2: Flow meter, 3: Deodorizing filter, 4: Filter outlet gas sample sampling port. Spinning convex 11 minutes (minutes)

Claims (1)

[Scope of Claims] (1) A raw material containing FeO and Fe_2O_3 as main components, 0.5 to 10% by weight based on the total iron content of the raw material.
1. An air purifying composition characterized in that it is produced by adding an oxypolybasic acid such as oxypolybasic acid and sufficiently reacting the raw material with the oxypolybasic acid. (2) Add 0.5 to 10% of the total iron content to the raw material containing FeO, Fe_2O_3, and Fe as main components
An air purifying composition produced by adding % by weight of an oxypolybasic acid and sufficiently reacting the raw material with the oxypolybasic acid. (3) For a raw material whose main components are FeO and Fe_2O_3, or a raw material whose main components are FeO, Fe_2O_3, and Fe, 0.5% of the total iron content of the raw material is added.
An air purifying composition characterized in that ~10% by weight of an oxypolybasic acid is added, the raw material and the oxypolybasic acid are sufficiently reacted, and then a base is allowed to coexist. (4) Blast furnace dust, sintering dust, steelmaking dust, rolling scale, etc., which are generated in a steel factory, are raw materials whose main components are FeO and Fe_2O_3, or whose main components are FeO, Fe_2O_3, and Fe. The air cleaning composition according to claim (1), (2), or (3), which is one or more selected from the group consisting of: , and steelmaking slag. (5) Claim (1) or (2), wherein the raw material whose main components are FeO and Fe_2O_3 is one or more selected from magnetite, artificial magnetite, and ferrite.
Or the air purifying composition described in (3). (6) Claim (1) or (2) wherein the oxypolybasic acid is one or a mixture of two or more selected from ascorbic acid, citric acid, gluconic acid, tartaric acid, tannic acid, gallic acid, and phthalocyanine. or (3) or (4
) or the air purifying composition according to (5). (7) The air purifying composition according to claim (1) or (2) or (3) or (4) or (5) or (6) is applied to an organic or inorganic carrier. An air purifying molded product featuring: (8) The air purifying molded article according to claim (7), wherein the carrier is a carrier of one or more metals selected from Fe, Mn, Al, and Zn.