JPH05192567A - Filter medium and production thereof - Google Patents

Abstract

PURPOSE:To make it possible to perform filtration at a high rate and to reuse it when used as a filter medium by forming a porous granules with a mixture of magnesium oxide and powdering org. waste material. CONSTITUTION:Magnesium, a powdering org. waste material, (e.g. a plastic waste material) and a granulating agent (e.g. bentonite) are mixed, granulated and fired to make it porous. As the result, it is used as a filter medium for removing inclusions, oils etc., in a liq. to make it possible to perform filtration at a high rate and to use it again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter material for filtering oil or the like (hereinafter referred to as "oil or the like") as foreign matter contained in a liquid and a method for producing the same.

[0002]

2. Description of the Related Art Wastewater from aquaculture fisheries and fisheries processing plants contains a large amount of organic impurities and fats. If left untreated, microorganisms will be generated and give off a foul odor.

Further, although the oils contained in the drains of machine tool manufacturers, various factories, gas stations, and car washes have taken preventive measures against their inflow into rivers, they have not been completely removed. ..

It is expected that these will flow out of the river into the sea and cause environmental pollution of the sea in the future.

Further, the cutting oil (coolant) used in the cutting process by the machine tool manufacturer is mixed with the lubricating oil and the metal powder adhered to the surface of the metal member (workpiece) to be processed in the process of cutting the metal. It is collected in the recycling tank in the state of being. If this is left for a long time, bacteria will grow in the fatty acid of the lubricating oil, and it will give off a bad odor and cannot be reused.Therefore, in order to reuse it as cutting oil, it is necessary to remove the lubricating oil as well as damage to the cutting process. It is also necessary to remove the metal powder that becomes

On the other hand, the amount of organic wastes such as plastic products and styrofoam products has been increasing year by year, and it is difficult to dispose of them at the waste treatment plant.

Recently, it has been attempted to export or remanufacture these wastes to foreign countries for the purpose of recovering, crushing, melting, shaping, and reusing them, but the amount of waste is too large. Due to the excessive supply of recycled raw materials, development of applications is required.

[0008] Further, the demand for coal has been declining steadily with the increase in the import amount of oil, and now a small number of coal mines are continuing to collect coal while seeking to develop the demand. However, the current situation is that pulverized coal containing impurities and low in calories discharged in the process of a coal preparation plant has no use and is discarded as industrial waste.

[0009]

Conventionally, an adsorbent for removing oil mixed in a liquid has been obtained by crushing bark and subjecting it to oil absorption processing. After mixing and burning silica stone and clay, crushing is performed. Hydrophobized ones (Japanese Patent Laid-Open No. 55-7549) and the like are known, but the former is a fine powder and is difficult to handle, and the purpose is to adsorb oil diffused on the surface of water or the surface of the ground rather than being used as a filter medium. After oil absorption, do you throw it as garbage,
Or it must be incinerated and the adsorbent itself cannot be reused.

Since the latter is crushed after firing, a large amount of powder is generated during the handling of the product, and when the cutting oil is filtered, the powder of the filter material is mixed and it interferes with the machine work and cannot be reused as the cutting oil. .. After the oil is absorbed, this filter material becomes dust like the former case, and when left unattended, it gives off a bad odor due to the bacteria generated in the lubricating oil. As a result, it is necessary to outsource the treatment to a waste treatment company, and treatment costs are required even after use, resulting in a high-cost filter material.

The present invention solves such a problem, and by effectively utilizing waste, it is possible to filter a liquid containing all impurities, and a filter material that can be reused by incinerating the impurities after use is provided. It is intended to be provided.

[0012]

According to the present invention, the above-mentioned object is achieved by forming a porous granular material with a mixture of magnesium oxide and powdery organic waste material as to the filtering material. It

Further, regarding the method for producing the above-mentioned filter material,
This is accomplished by mixing magnesium oxide with a granular organic waste material together with a granulating agent, granulating and granulating, and then firing to make it porous.

[0014]

The filter material of the present invention is porous because the organic waste material burns or volatilizes when it is fired after granulation in the manufacturing process.

Therefore, when this is used as a filtering material, it is possible to secure a large adsorption space and a contact area for oil and the like in the liquid because it is porous, so that the oil adheres during filtration.

In order to reuse the filter medium, oil or the like is burned to be removed, and the filter medium can be repeatedly used.

When the filter material of the present invention is subjected to a water repellent treatment, it does not absorb or attach water during filtration, so that the effect of filtering oil or the like is improved. This water repellent treatment is performed by coating silicon or the like.

In the present invention, the shape of the granular material is not particularly limited, and may be spherical in the field where the breaking strength is important, and granular in the field where the adsorptive property is important. Also, the granulating agent is not particularly limited, and papermaking wastewater concentrate, alcoholic fermentation wastewater concentrate, and bentonite can also be used.

[0019]

EXAMPLES Examples of the present invention will be described below.

<Example 1> With 4 kg of magnesium oxide,
1 kg of a plastic waste material pulverized to have an average particle diameter of 0.6 mm or less was mixed, and 1,300 cc of a papermaking waste water concentrate diluted with water as a granulating agent was added thereto and sufficiently mixed.

This mixed mixture was put into a rolling granulator and granulated. The granulated mixture was dried in a drier until the water content disappeared, and the mixture was calcined in an atmosphere of 1,300 ° C for 1 hour. The prototype obtained here was designated as "Prototype 1".

<Example 2> With 4 kg of magnesium oxide,
1 kg of a plastic waste material pulverized to have an average particle diameter of 0.6 mm or less was mixed, and 1,300 cc of a papermaking waste water concentrate diluted with water as a granulating agent was added thereto and sufficiently mixed.

Further, the mixed mixture was extruded and put into a granulator to obtain a columnar and irregularly shaped granulated product. The obtained granulated product is dried in a dryer until the water content disappears,
It was fired in an atmosphere of 0 ° C for 1 hour. The prototype obtained here is referred to as "Prototype 2".

<Example 3> 2.5 kg of magnesium oxide
Then, 2.5 kg of coal powder pulverized to have an average particle size of 0.6 mm or less was mixed, and 1,300 cc of a papermaking wastewater concentrate diluted with water as a granulating agent was added thereto and sufficiently mixed.

The further mixed mixture was put into a rolling granulator and granulated. The granulated mixture was dried in a drier until the water content disappeared, and the mixture was calcined in an atmosphere of 1,300 ° C for 1 hour. The prototype obtained here is referred to as "Prototype 3".

<Example 4> 2.5 kg of magnesium oxide
2.5 kg of coal powder pulverized to have an average particle size of 0.6 mm or less was mixed, and 1,300 cc of a papermaking waste water concentrate diluted with water as a granulating agent was added thereto and sufficiently mixed.

Further, the mixed mixture was extruded and put into a granulator to obtain a columnar and irregularly shaped granulated product. The granulated mixture is dried in a dryer until the water content disappears, and this is mixed with 1,3
It was fired in an atmosphere of 00 ° C for 1 hour. The prototype obtained here was designated as "Prototype 4".

Next, the prototypes thus obtained were subjected to various tests, and the results will be described.

Table 1 shows a physical property test of each of the obtained prototypes. It can be seen that the sample has excellent water absorption and oil absorption because it is lightweight, has sufficient hardness, and has a large open area ratio. In addition,
In Table 1, the definitions of the main characteristics are as follows.

True Specific Gravity: Specific Gravity of Filter Material itself without Porous Openings for One Granule Bulk Specific Gravity: Average Value of Specific Gravity of One Granule with Porous Openings for Multiple Granules Packing density: Density when a plurality of granules are packed in a container with a fixed volume Hardness: Pressure of the external pressure when the granules are broken by applying external pressure Porosity: Opening with respect to the volume of the filter medium including pores Pore volume ratio

[0031]

[Table 1] Table 2 shows the results of the filtration test in which the water-repellent treated prototype 1 and the water-repellent treated prototypes 1 to 4 were placed in the funnel and the test solution was poured from above and passed once. The oil analysis was determined by n-hexane extract material. In Table 2, the filtration rate indicates the ratio of the amount of oil or the like in the mixed water to the amount of oil or the like removed by the filtering material.

Even with the prototype 1 which has not been subjected to the water-repellent treatment, it is possible to filter about 70% of the lubricating oil or the waste oil by passing the solution once, and it is possible to completely remove it by repeatedly filtering. For example, if it is performed twice, the filtration rate will be about 90%.

It was confirmed that each of the water-repellent prototypes had a remarkable effect on the removal of lubricating oil and waste oil.

[0034]

[Table 2]

[0035]

Industrial Applicability As described above, according to the present invention, even when water-repellent treatment is not applied, the effect of filtering oil and the like at a high rate can be obtained, and mineral fat as well as animal fat can be removed. became. Furthermore, since magnesia oxide having a high melting point is used, it is possible to repeatedly use it as a filter medium by incinerating the filtered material attached to the used filter medium.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Tanaka 60, 173 Nishiki-cho, Kitami-shi, Hokkaido (72) Inventor Tatsuo Ono 439-1, Miwa, Kitami-shi, Hokkaido

Claims (4)

[Claims] 1. A filter medium comprising a mixture of magnesium oxide and a powdery organic waste material, and forming a porous granular material. 2. The filtering material according to claim 1, wherein the organic waste material is a plastic waste material. 3. The filtering material according to claim 1, wherein the organic waste material is pulverized coal. 4. A method for producing a filter medium, which comprises mixing magnesium oxide with a powdery organic waste material together with a granulating agent, granulating and granulating, and then firing to make the material porous.