JPS6025171B2 - Manufacturing method of filter media - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a furnace material, particularly a furnace material in which spherical, block-like, and linear voids are formed in a molded body.

Generally, when Daisenjo etc. is fired, bisque sintered material having water absorbing properties is produced, and this is because the fired product is porous.

Although bricks and the like are porous, it is already known that refractory bricks can be obtained by further increasing the pores and increasing the heat insulation properties. For example, a method is known in which a combustible material such as sawdust, coke, or expanded polystyrene particles is kneaded into a clay raw material, the mixture is formed into a certain shape, and then the combustible material is burned to generate voids. However, even if the molded products obtained by these methods are porous, the voids are isolated from the outside world, so properties such as air permeability and liquid permeability are not necessarily good. That was difficult. As a result of research, the present inventors aimed to improve air permeability and liquid permeability to obtain a highly rutted porous molded product useful as monkey wood.
If an attempt is made to improve air permeability and liquid permeability by forming only spherical or block-shaped voids inside the molded body as in the past, the molded body becomes brittle and it is not possible to obtain a strong molded body. The present invention was completed based on the discovery that when spherical or block-shaped voids and linear voids coexist, air permeability and liquid permeability are improved without reducing the strength of the molded article. In the present invention, 0.5 to 3 parts by volume of a mixture of paper sludge, walnut powder (particle size 0.1 to 5) and thermoplastic resin particles (particle size 0.1 to 5) are added to clay, and water is added to the clay. After adding and kneading and forming into a certain shape, 800 to 15
Production of a furnace material characterized in that the papermaking sludge, walnut powder, and thermoplastic resin particles are burned and removed by heating to 0 picoC to form spherical or lump-like and linear voids in the molded product. The gist is the method.

The clay used in the present invention is an inorganic clay raw material commonly used for making pottery, bricks, etc.

For example, Frog's eye clay, Kibushi clay, Katsuraite, Feldspar, or a mixture thereof are generally used. Paper manufacturing sludge is a variety of waste products generated in the paper manufacturing process, such as park generated when pulp is produced from wood, ND dust generated when pulp is beaten, bush mud sludge generated when pulp is washed or concentrated, Examples include lees-like substances produced when paper is made. These papermaking sludges retain wood fibers. Walnut flour is a powder obtained by crushing walnut grains, and those having a grain size of 0.1 to 5 ribs, preferably 0.1 to 2 ribs are used.

Thermoplastic resin particles are particles of polyethylene, polypropylene, polystyrene, etc., or particles obtained by pulverizing these foams that have been further heated to lose their foaming capacity.
Particles having a particle diameter of 0.1 to 5, preferably 1 to 3 ribs are used. If the thermoplastic resin foam is used as is, it is not preferable because the molded product may crack or become deformed due to secondary foaming. However, the presence of a small amount of air bubbles is acceptable as long as it does not cause deformation of the molded product. In the method of the present invention, papermaking sludge (dried), walnut flour, and thermoplastic resin particles are mixed with 1 part by volume of clay (dry).
．． 5 to 3 parts by volume are mixed.

In order to facilitate mixing, the above components are preferably dried beforehand. If paper sludge, walnut powder, and thermoplastic resin particles are used in less than the above amounts relative to the clay, a sufficient member will not be obtained, and if more than the above amounts are used, the resulting molded product will become brittle, which is not desirable. do not have. Paper sludge, walnut flour and thermoplastic resin particles are used in a ratio (volume ratio) of 1:9 and 9:1. Mix each of the above ingredients, add water and mix thoroughly to mix uniformly.

After molding this into a certain shape, 800 to 1500 qo
heat treated. Since the walnut flour and thermoplastic resin particles do not absorb moisture from the clay, there is no risk of deformation that would cause cracks in the molded article. If there is a relatively large amount of papermaking sludge, there is a risk of deformation and cracking of the finished product.
In this case, it is preferable to bake at a relatively low temperature (800 to 900 oo), and if the papermaking sludge is a little, it may be baked at a higher temperature (1,100 to 1,500 qo).
By firing, organic components such as papermaking sludge, walnut flour, and thermoplastic resin particles are burnt out, and a furnace material with voids formed in those areas is obtained. The voids created by firing the walnut powder or thermoplastic resin particles have a spherical or block shape depending on the shape of the walnut powder or thermoplastic resin particles, and the diameter thereof is 0.1
~5 skin, and by mixing particles with different particle sizes, voids with different diameters can be formed. The voids formed by baking the papermaking sludge are linear and form dovetail-like voids, the diameter of which is smaller than the diameter of the voids created by the particles. The furnace village obtained by the method of the present invention is extremely porous, with spherical or block-shaped voids and bran-like voids coexisting inside it, and the linear voids promote conduction of the liquid or gas. However, the spherical or block-shaped voids can fully exhibit the filtering or adsorption function. Therefore, compared to conventional oak wood, clogging is less likely to occur, and transfer or adsorption can be carried out effectively. The present invention may be used for purposes such as purification of industrial wastewater or sewage, adsorption of oil, and blast pipes. Conventionally, papermaking sludge has few uses and has been treated as waste, and it is desired that thermoplastic resin moldings after use be effectively disposed of as industrial waste.

The present invention makes it possible to effectively recycle these industrial wastes, and is extremely useful. Examples of the present invention will be shown below.

Example 1 1 volume part of paper sludge (ND dust), 2 parts by volume of walnut flour, and polystyrene foam were heated and compressed to destroy air bubbles, and 3 parts by volume of resin particles obtained by crushing were mixed, and this mixture was mixed. Mix well with 1 part volume of clay (dry) used for making pottery, add water, knead, and then form into a pipe.

This is dried and fired at a temperature of 1,000 to 130 degrees. The internal structure of the obtained furnace material, as shown in Fig. 1, consists of linear voids 1 created by firing the papermaking sludge, and relatively large voids 2 created by firing the resin particles (diameter 1 to 3 side). And relatively small voids 3 created by walnut powder (diameter 0.1 to 1 skin) are dispersed in the fired clay 4. Example 2 The same furnace material as in Example 1 was obtained as a result of the same treatment as in Example 1 except that 3 parts by volume of walnut powder and 5 parts by volume of resin particles were used.

Reference Example 1 To 4 parts of clay (dry) used in the manufacture of pottery, 1 part of papermaking sludge and 4 parts of walnut powder were added and treated in the same manner as in Example 1. As a result, Example 1 was obtained. A similar furnace material was obtained.

Reference Example 2 As a result of processing in the same manner as in Example 3 using 6 parts by volume of paper sludge and 5 parts by volume of walnut powder, a furnace material with many linear voids and few spherical and lump-like voids was obtained. Ta.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view schematically showing the inside of a furnace material obtained by the method of the present invention.

In the drawing, 1 is a linear gap, 2 is a relatively large gap,
3 is a relatively small void, and 4 is fired clay. Figure 1

Claims (1)

[Claims] 1. Paper sludge, walnut powder (particle size 0.1
~5 mm) and thermoplastic resin particles (particle size 0.1~5 m)
Add 0.5 to 3 volumes of the mixture of step m), add water, knead it, mold it into a certain shape, and then heat it to 800 to 1500°C to burn the paper sludge, walnut powder, and thermoplastic resin particles. 1. A method for producing a filter medium, which comprises removing the filter medium to form spherical or block-like and linear voids in the molded body. 2. The method according to item 1, wherein the walnut powder has a particle size of 0.1 to 1 mm, and the thermoplastic resin particles have a particle size of 1 to 5 mm.