JPS61164658A - Recovery of water absorbing molded article - Google Patents

Abstract

PURPOSE:To efficiently recover water absorbing molded articles, by containing a magnetizable substance such as an iron powder in each of the water absorbing molded articles and attaching said molded articles by the magnetic force of a metal removing device above a belt conveyor on the way of the transport of a deposit on which said molded articles were scattered. CONSTITUTION:Each of a water absorbing molded articles 1 is formed by allowing an iron powder or iron fiber to be present in a kneaded substance of a high-molecular resin such as polyurethane or butyl rubber and a water absorbable resin. These molded particles are scattered on the surface of a bulk stock material deposit 5 piled on an open-air storage yard or mixed in said deposit 5 to absorb moisture contained in said deposit 5 by rainwater. Next, on the way of the transport of the deposit 5, on which the water absorbing molded articles 1 were absorbing molded articles 1 are separated and recovered from the deposit 5 by the magnetic force of the metal removing device 8 arranged above a belt conveyor 4. After recovery, the molded articles are dried and reutilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for recovering a water-absorbent molded article used for reducing the water content of open piles made of bulk storage materials stored in outdoor yards.

[Conventional technology]

In departments where bulk storage materials are stored as open piles and heated or burned in subsequent processes, the moisture contained in the open piles must be evaporated using excess water. Requires heat.

For example, in the case of coking coal used for coke production, there is a problem that rainwater permeates and increases the moisture content when the coal is stored in an outdoor yard. The increase in water content due to rainwater infiltration of coal, which is an open deposit, requires extra heat as mentioned above for water evaporation, leading to large economic losses, and in the case of coking coal, it is necessary to increase the water content during the coking process. Therefore, simply suppressing the increase in moisture content of coal due to rainwater, which has various adverse effects on coal, will bring about great benefits, and if this can be further reduced, the effect will be significant.

Conventionally, efforts have been made to solve the above-mentioned moisture content problem by lowering the moisture content of open deposits at the time of arrival and at the same time suppressing the increase in moisture content due to rainfall. In order to lower the moisture content, we request suppliers to take measures to reduce the moisture content, and in order to prevent moisture content from increasing due to rain during open piling, we may install drainage ditches or apply polymer resin or cement coatings to the surface of the piles. Methods are being used to prevent rain from seeping into the interior of the deposit by causing it to form. In addition, when using open deposits with high moisture content, there is a method of adding a drying process as a pre-processing treatment.

The above-mentioned method has the drawback of requiring complicated equipment and laborious work, and in order to improve these drawbacks, the applicant has proposed a method for easily reducing water content using a water-absorbent molded product. No. 182568 was proposed. In this method, in order to reduce the moisture content of the open piles, a water-absorbent molded product made of a water-absorbing resin with extremely high water-absorbing performance is sprinkled on the surface of the bulk materials or mixed inside them, and the Water is absorbed in the process of discharging the material to the next process, and 250 to 2
In this method, the water-absorbent molded product swollen to 00 times was recovered by sieving.

In this case, the mesh size of the sieve used must be set so that the entire amount of open deposits passes through and the swollen water absorbent molded product (after water absorption) is retained on the sieve.

In the conventional method described above, when the amount of transportation is small, the recovery rate of the water absorbent molded material is good, but when the amount of transportation increases, the amount of open deposits thrown into the sieve increases, so the load must be reduced. As a result, a large amount of water passes through the sieve, resulting in a poor recovery rate of the water absorbent molded product.

In addition, since clogging of the sieve occurs, it is necessary to perform work to eliminate the clogging or take countermeasures to prevent clogging.

[Problem that the invention seeks to solve]

The present invention is a further improvement of the above-mentioned proposal, and aims to provide a recovery method that can reliably recover water-absorbing molded articles that have absorbed water, and to improve the effectiveness of the above-mentioned proposal.

[Means for solving problems]

In order to achieve the above object, the present invention mainly includes the following technical means.

■ Incorporate a magnetized substance such as iron powder or iron fiber inside the water absorbent molded product.

(2) The water-absorbent molded product (2) above is sprinkled and mixed onto the surface or inside of the bulk material deposits piled up in the storage yard to absorb water.

(2) While the deposit on which the water-absorbent molded material has been scattered is transported from the storage yard to the next process, the water-absorbent molded material is separated and recovered from the deposit by the magnetic force of a metal remover installed on a belt conveyor.

■ The collected water-absorbent molded products are dried in the sun or in a dryer and reused for circulation.

The water absorbent molded product used in the present invention contains iron powder or iron fibers during kneading and molding of a polymer resin and a water absorbent resin.

Water-absorbing resin becomes gelatin-like when it absorbs water.
It is located between a water-soluble substance and a gel-like substance.

It looks like a white powder and when water is poured into it, it absorbs water, swells and turns the water metal into a gel.

The water-absorbing power of the water-absorbing resin itself reaches hundreds to thousands of times.

When water-absorbing resin absorbs water, it becomes gelatin-like.

If it remains as it is, it will be difficult to separate it from the sediment even if it is mixed or sprayed into the piled-up sediment. For this reason, a polymer resin and a water-absorbing resin are kneaded and used. Polyurethane, butyl rubber, vinyl resin, etc. are used as the polymer resin.

The present invention uses a water-absorbent molded product formed as described above that further contains iron powder or something that is attracted by magnetic force, such as iron fiber. Powdered materials can be mixed during kneading, and sheet-like materials such as iron fibers can be made into a sandwich during molding. Since the iron powder or iron fiber contained therein may rust due to contact with water during water absorption, it is better to coat the surface with paint or the like to an extent that does not reduce the magnetizing ability.

The shape and dimensions of the above-mentioned water-absorbent molded material when mixing and dispersing it into open piles are not regulated by the size of the sieves as in conventional methods, so it is possible to adjust the shape and size within the range that does not pose a problem to the transportation of open piles. You can choose any shape or size.

The collection of the water-absorbent molded material that has been mixed and sprinkled on open piles to absorb water is carried out during the process of discharging the open piles from the storage yard to the next process using a belt conveyor. This is done by taking advantage of the fact that iron powder and iron fibers are magnetized and attracted by the magnetic force of the vessel. In this case, it is not limited to iron powder or iron fibers, but any material that exhibits the property of being magnetized and attracted by a magnet can be mixed and used in the water absorbent molded product.

[Effect]

The present invention involves mixing a water-absorbent molded article with magnetizability and high water-absorbing performance into the bulk material or scattering it on the surface of the bulk material, absorbing moisture attached to the bulk material or rain water, and absorbing water when discharging the bulk material. This method uses magnetic force to reliably separate the particles, making it possible to reduce the moisture content of loose materials by using a water-absorbent molded product at a lower cost and more easily.

〔Example〕

FIG. 2 shows an example of a water-absorbent molded product 1 containing iron powder 2, and FIG. 3 shows an example of a water-absorbent molded product 1 containing iron fibers #I3 in a sandwich-like manner.

The flow of mixing, dispersing, and collecting the water-absorbent molded material into open deposits is as shown in Figure 4. A metal remover is installed between discharging and use, which separates the water-absorbing material from the deposit. , perform collection.

FIG. 1 shows a state in which bulk materials (open piles) 5 containing a water-absorbent molded product 1 are transported by a belt conveyor 4 and are passing through a position where a metal remover 8 is installed. The water-absorbing molded product 1 contained in the bulk material 5 is attracted by the electromagnet of the metal remover 8, adheres to the endless belt 7, is carried by the endless belt 7 to a place where there is no electromagnet, and reaches a part where the magnetic force does not reach. , falling due to gravity. The fallen water absorbent molded product 1 is guided to a collection box 10 by a chute 9 and collected.

Regarding the content ratio of iron powder or iron fiber in the water absorbent molded product, the higher the content ratio, the more it will be attracted to the electromagnet,
Although the recovery rate is high, since the content ratio of the water-absorbing resin is relatively reduced, the effect of reducing the moisture content of open deposits is reduced.

The results of experiments using iron powder are shown in Table 1. From the recovery rate, it is good if the iron powder ratio is 30% by weight or more, but from the water absorption capacity, it is better than 40% by weight. When the iron powder ratio becomes 30 to 40% by weight, the iron powder ratio decreases considerably.

Table 1 Note ■Water absorption capacity is based on the following formula.

(2) The recovery rate is expressed as % by weight after drying after recovery, assuming that the subacid mixed into the open sediment is 100%.

〔Effect of the invention〕

(1) In the conventional sieving method, the shape of the water absorbent molded product,
Although the dimensions were determined by the size of the sieve mesh used, in the present invention, the dimensions can be arbitrarily selected within a range that does not pose a problem to the transportation of open deposits.

(2) Compared to conventional methods, recovery from open piles has become more reliable and the recovery rate has improved. In other words, the conventional recovery rate 6
The recovery rate of the present invention was 80-90%, whereas the recovery rate was 0-70%.

(3) In the conventional method, work to clear the clogging of the sieving machine is inevitable, but in the present invention.

Such work does not occur.

(4) Therefore, it has become possible to reduce the moisture content of bulk materials using a water-absorbent molded product at a lower cost and more easily.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the operating state of an example of a device for suitably carrying out the present invention, FIGS. 2 and 3 are partially cutaway perspective views of an example of a water absorbent molded product, and FIG. 4 is a process of the present invention. FIG. ■...Water absorbent molded product, 2...Iron powder, 3...Iron fiber (SeeItA:), 4...Belt conveyor, 5...
Loose items, 7...Endless belt, 8...Metal remover. 9...Chute, lO...collection box.

Claims (1)

[Claims] A magnetizable water absorbent molded product is formed by mixing iron powder or iron fibers into a water absorbent resin, and the water absorbent molded product is applied to the surface of an open pile of bulk materials stored in an outdoor yard. Alternatively, after scattering the loose materials in the open deposits and making the water absorbent molded product absorb the water adhering to the loose materials, the water absorbent molded products are placed in a metal remover disposed on a belt conveyor that transports the open deposits. A method for recovering a water-absorbent molded article, which is characterized by adsorbing and recovering objects.