JPS58153537A - Adsorbent - Google Patents

Abstract

PURPOSE:To provide an adsorbent having improved moldability, heat resistance, strength, etc. in the stage of molding active carbon by using a binder consisting of powder of granulated balst furnace slag and alkali metal hydroxide. CONSTITUTION:An adsorbent which is produced by kneading active carbon and a binder consisting of granulated blast furnace slag of about 3,000mm.<2>/g Blaine specific surface area and alkali metal hydroxide sch as NaOH with water, molding the mixture to desired shapes and hardening the moldings and is suited for deodorants, etc. The alkali metal hydroxide is used in this binder usually at about 0.5-15pts.wt. based on 100pts.wt. the granulated blast furnace slag. The adsorbent is compounded at ratios of about 100 parts the granulated blast furnace slag, about 5-50 parts the binder, and about 50-200 parts water. If necessary, water reducing agents for cement and molding assistants are added to provide adequate moldability with less water to be used, whereby the adsorbent having high strength is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adsorbent using finely powdered granulated blast furnace slag and an alkali metal hydroxide as a binder when molding activated carbon.

Traditionally, adsorbents made by molding active materials into desired shapes using organic binders such as polyester and epoxy or inorganic binders such as Portland cement and alumina cement have been widely used as deodorizing agents. has been done.

However, products using these binders have a negative effect on adsorption capacity, lose their shape when recycled at 6oo~1000'c, and lose strength, making them difficult to reuse. There was a problem.

In other words, using an organic binder can improve the finish of the activated carbon powder by flaking off from the adsorbent surface, but since it covers the surface of the activated carbon, the adsorption capacity decreases and the heat resistance decreases. small. On the other hand, inorganic binders do not have a large negative effect on the adsorption capacity, but the finish is poor and the heat resistance is low.

As a result of various studies to solve these drawbacks, the present inventor found that granulated blast furnace slag powder and alkali metal hydroxide could be used as the binder, and completed the present invention. .

That is, the present invention is an adsorbent formed by molding activated carbon into a desired shape using a binder made of granulated blast furnace slag powder and an alkaline earth metal hydroxide.

The present invention will be described in detail below. Activated carbon can be used regardless of whether it is powdered activated carbon or granulated activated carbon.

As for the granulated blast furnace slag powder, it is sufficient to use a very ordinary one discharged as a by-product during steel manufacturing, and it is desirable to make the powder fine according to the fineness of the activated carbon, but it is important to reduce the strength development. Considering the Blaine specific surface area 3,
000 cm5/l is sufficient.0 Alkali metal hydroxide is a necessary component to stimulate the hydration activity of granulated blast furnace slag powder and form an adsorbent in a short time, and its use is The amount is 0.5 per 100 parts by weight of granulated blast furnace slag.
It is preferable to have a depth of about 15 to 15. If the amount is significantly less than 0.5 parts by weight, the strength development will be small, and if the amount is more than 15 parts by weight, there will be no increase in the strength development, and there is a risk that the alkali will elute. It is preferably 3 to 10 parts by weight. Alkali metal hydrates also have the effect of activating activated carbon and have a positive effect on adsorption capacity. Examples of the alkali metal hydroxide include LiOH, NaOH, and KOH, but NaOH is industrially preferred.

Further, the alkali metal hydroxide is, for example, Na2CO3
By using it in combination with an alkali metal carbonate or alkali metal hydrogen carbonate such as NaHCO3, K2Co, or IG(Co), an adsorbent with even greater strength can be obtained. slag 100
The amount may be 10 parts by weight or less, particularly 5 to 8 parts by weight, or it may be in powder form.

The adsorbent of the present invention can be obtained by kneading the above activated carbon and binder with water, shaping it into a desired shape, and then curing it. An example of these blending ratios is: 100% granulated blast furnace slag by weight
part, 5 to 50 parts of binder, and 50 to 200 parts of water.

At that time, it is desirable to add a cement-based water reducing agent or a molding aid in order to provide appropriate moldability with less water usage and to obtain a strong adsorbent.

Examples of cement water reducing agents include alkylaryl sulfonate, aromatic polycyclic condensate sulfonate, water-soluble melamine formalin sulfonate, lignin sulforate, oxyorganic acid salt, and polyol. One or two or more selected from the group consisting of polyoxyethylene alkyl ether, higher polyhydric a)lecole, etc. are used. Among these, compounds having a sulfone group in the molecule and oxyorganic acid salts are particularly preferred. The amount of these used is about 0.01 to 3 parts by weight per 100 parts by weight of the binder.

In addition, molding aids include water-soluble polymer substances such as starch, carboxymethyl cellulose, methyl cellulose, Avicel, polyvinyl alcohol, and lignin;
Ray-based materials such as bentonite, kaolin, activated clay, acid clay, and diatomaceous earth; inorganic materials such as colloidal silica, alumina sol, aluminum phosphate, alkali silicate, and silicate fluorides; Examples include □bentonite grafted with an organic group, organic polymer latex, etc. Among these, clay-based and inorganic-based materials are particularly preferred. The amount used is 200 parts by weight or less per 100 parts by weight of activated carbon.

As described above, the adsorbent of the present invention is made by molding activated carbon with granulated blast furnace slag powder and alkali metal hydroxide as a binder, and as a result, the powdered activated carbon does not flake off (it has a good finish). ), it does not affect the adsorption capacity at all, has high heat resistance, and shows almost no decrease in strength even after regeneration treatment at 600 to 1000 C, making it possible to create an adsorbent with excellent performance.

The present invention will be further explained below with reference to Examples.

Example 1 Granular metallurgical coal was manufactured by the following steps.

First, on a weight basis, Blaine specific surface area 6 for 100 parts of powdered activated carbon (coconut shell charcoal activated with steam),
000 cm”/l 65 parts of granulated blast furnace slag powder, Na
While mixing 2 parts of OH, 0.03 parts of sodium gluconate, 15 parts of pen tonite, 1 part of activated clay, 2 parts of alumina sol and polyvinyl alcohol, 170 parts of water was gradually added, and the resulting wet kneaded product was mixed. Pour into pelletizer,
It was formed into cylindrical granules. Note that a mortar mixer was used as the mixer. In the next step G), the wet pellets were spheroidized using a Marumerizer, which is a rotating granulator, and dried at 100C. 1 to 5 wm of the obtained molded product
These were selected and used as the adsorbent of the present invention. As a comparative product, an adsorbent was manufactured in the same process using ordinary Portland cement and a polyester-based binder.

In order to evaluate the performance of these adsorbents, the strength and adsorption amount of phenol were measured after drying at 100C and after regeneration treatment at 700C. The results are shown in Table 1.

The strength is measured by placing a grain of activated carbon on the stand, placing a flat plate on top of it, and applying force to it to break it.
was read and measured. In addition, the amount of adsorption is 1 p of phenol solution.
1? granulated activated carbon was added and passed through the mouth, and the amount of phenol remaining in the liquid was determined to determine the amount of adsorption.

The following is a margin: Table 1 Example 2 A prismatic (-
A test was conducted on an adsorption amount of 2 cm x 2 cm x 8 m). The results are shown in Table 2.

The compressive strength was measured according to JISR52 (11) Table 2

Claims (1)

[Claims] An adsorbent made by molding activated carbon into a desired shape using a binder consisting of granulated blast furnace slag powder and an alkali metal hydroxide.