KR101357829B1 - Recycling material of industrial sludge for use of fill material, cover material and subbase material and method for producing the same - Google Patents

Abstract

The present invention relates to a recycling material of industrial sludge for usage as a fill material, a cover material, a subbase course material, and a manufacturing method thereof and more specifically, to a recycling material of industrial sludge and a manufacturing method which are capable of using an industrial sludge which is generated from industrial settings as a fill material, a cover material, and a subbase course material by adjusting the particle size, the percentage of water content, the hygroscopicity, and the porosity. The recycling material is manufactured from the industrial sludge which has less than 40 wt% of organic content; and comprises 5-10 wt% of admixture which includes inorganic cement and a pH neutralizing agent; 7-15 wt% of soil and loess; 75-88 wt% of industrial sludge; and has 1-15 % of specific moisture absorption rate and 90-250 of resilient modulus (MR). [Reference numerals] (S11) Preparing the industrial sludge and measuring the water content; (S12) Adjusting the water content and adding the first solidification agent; (S13) A first crushing and deodorizing; (S14) Adding soil and mixing; (S15) Adding a second solidification agent; (S16) Mulling; (S17) Adjusting the particle size

Description

Recycling Material of Industrial Sludge for Use of Fill Material, Cover Material and Subbase Material and Method for Producing the Same}

The present invention relates to a recycling material of industrial waste sludge for fill, cover, and auxiliary base material, and a method of manufacturing the same, and specifically, to control industrial moisture sludge generated at an industrial site by adjusting water content, hygroscopicity, porosity, or particle size, The present invention relates to a recycling material for industrial waste sludge that can be used for base material and a method of manufacturing the same.

Generally sludge or sludge refers to sediments from sewage or water treatment. Sludge may be present in the form of mud or sediment deposits in sewers or from sedimentation in streams or lakes. Sludge may also occur in sedimentary solids from sewage or in sedimentation basins in sewage treatment plants. On the other hand, sludge can be generated in the form of waste on industrial sites and various forms of industrial waste can be generated, causing environmental problems. Sludge generated in various forms as described above contains a large amount of organic matter and has a problem that it is difficult to process a high moisture content. Sludge can be classified into organic sludge and inorganic sludge based on the content of organic substance in solids, and can be classified into organic sludge if the content of organic matter is 40% or more and inorganic sludge if less than 40%. Organic sludge was treated by stabilization by base treatment and by dehydration and landfilling. Inorganic sludge, however, is difficult to process in this way, and can be generated in large quantities and cause environmental problems, and thus need to be treated in other ways. And if it is recyclable, it is advantageous to be made of recyclable materials.

Prior art related to the treatment of inorganic sludges or industrial wastes is disclosed in Korean Patent Publication No. 2010-0099988, 'Solid-free and road paving materials for non-machined liquid ceramics and construction sludges, and a method of manufacturing the same'. The prior art is an inorganic liquid ceramic prepared by compression molding or laying and wet curing by mixing the inorganic liquid ceramic to improve the bonding strength of the mixed red soil and construction sludge powder after mixing the red soil and construction sludge powder and Disclosed is a solid material using a construction sludge.

Another prior art related to the treatment of inorganic sludge or industrial waste is Patent Publication No. 2009-0083971, 'Environmentally Friendly Landfill Material Using Industrial Waste and Its Manufacturing Method.' The prior art is obtained by homogeneously mixing 100 to 300 parts by weight of phosphate gypsum, 20 to 100 parts by weight of bypass dust to obtain a binder and 100 parts by weight of the slag fine powder and mud sludge, waste foundry sand And it discloses a method for producing environmentally friendly fill material including the step of mixing 100 to 1000 parts by weight of at least one selected from construction wastes.

The method proposed in the prior art has a problem in that it is difficult to treat various types of industrial waste, for example, different sizes of particles and difficult to treat industrial wastes having different water contents. In addition, the various types of landfills produced in various industrial sites have a problem in that industrial wastes are difficult to be processed in large quantities and the stability of the manufactured landfills is difficult to be guaranteed.

The present invention is to solve the problems of the prior art has the following object.

An object of the present invention is to recycle industrial waste sludge for fill, cover and subbase materials by mixing the appropriate amount of solidifying agent and soil according to the water content of the industrial waste sludge, so that the industrial waste sludge can be recycled as a fill material, cover material or auxiliary base material. It is to provide a material and a method of manufacturing the same.

According to a suitable embodiment of the present invention, the recycling material is made from industrial wastes with an organic content of less than 40 wt%; 5 to 10 wt% of an admixture comprising an inorganic solidifying agent and a pH neutralizing agent; Soil or ocher 7-15 wt%; And 75 to 88 wt% of sludge for industrial waste; And a specific moisture absorption of 1 to 15% and a recovery modulus of elasticity (MR) of 90 to 250.

According to another suitable embodiment of the present invention, the average particle size is 0.1 to 30 mm and the expansion ratio is 0.80 to 1.05%.

According to another suitable embodiment of the present invention, a method for producing a recycling material for landfill, cover material and auxiliary base material from inorganic industrial waste sludge is to add a primary solidifying agent while controlling the feed rate according to the moisture content of the industrial waste sludge. step; Deodorizing while grinding the solidified inorganic sludge; Adding earth or ocher to the deodorized inorganic sludge; Adding a secondary solidifying agent to the mixed inorganic sludge; And kneading the inorganic sludge with the addition of a secondary solidifier, wherein the primary solidifier is at least one selected from, for example, calcium, bentonite, slug powder, anhydrous gypsum, fly ash and cement clinker raw materials. And the secondary hardener is at least one selected from the group consisting of silica, clay, fly ash, slaked lime, quicklime, carbide ash, stainless slag, sodium sulfide and magnesium.

Since the recycling material according to the present invention has an appropriate moisture absorption rate, the physical or chemical properties of the material may be maintained during storage or transport so that the recycling material may be easily applied to a construction site of a fill, cover, or auxiliary base material. In addition, the recycling material according to the present invention has the advantage that it has a suitable condition for the environment of the construction site by appropriately adjusting the size of the particles or the size of the pores. In addition, the recycling material according to the present invention has an advantage of being environmentally friendly because it can be produced from industrial waste generated in various industrial sites and does not generate environmental pollutants. In addition, by enabling the recycling of industrial waste generated in large quantities due to the recycling material according to the present invention has the advantage of reducing the social cost due to environmental problems while reducing the construction cost of various construction sites.

1 schematically illustrates an embodiment of a manufacturing process of a recycling material according to the present invention.
2 shows an embodiment of a device for the manufacture of a recycling material according to the invention.
Figure 3 shows an embodiment of a kneading apparatus that can be applied to the production of the recycling material according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, so that they will not be described repeatedly unless necessary for an understanding of the invention, and the known components will be briefly described or omitted. However, It should not be understood as being excluded from the embodiment of Fig.

The recycling material of industrial waste sludge according to the present invention is produced from industrial wastes in which the organic content is less than 40 wt%; 5 to 10 wt% of an admixture comprising an inorganic solidifying agent and a pH neutralizing agent; Soil or ocher 7-15 wt%; And 75 to 88 wt% of sludge for industrial waste; And a specific moisture absorption of 1 to 15% and a recovery modulus of elasticity (MR) of 90 to 250. In addition, the recycling material of the industrial waste sludge according to the present invention has an average particle size of 0.1 to 30 mm and an expansion ratio of 0.80 to 1.05%.

Hereinafter, an embodiment of a method of manufacturing a recycling material according to the present invention will be described.

1 schematically illustrates an embodiment of a manufacturing process of a recycling material according to the present invention.

Recycling material according to the present invention comprises the steps of measuring the water content by classifying according to the causes caused by the collection of industrial waste sludge in the industrial site (S11); Adding a primary solidifying agent while adjusting the water content of the sludge (S12); Solidifying agent is added to deodorize while grinding the cured sludge (S13); Injecting the earth and sand mixing step (S14); Adding a second solidifying agent to the sludge mixed with the earth and sand (S15); Mixing the sludge while the second solidifying agent is added (S16); And adjusting the particle size according to the use of the recycling material (S17).

The recycling material according to the present invention may be made from industrial waste generated at any industrial site and may be, for example, an inorganic sludge generated at a construction site, a manufacturing site or a general workplace. In general, industrial waste sludge from industrial sites meets heavy metal content or pollutant emission standards. The recycling material according to the invention can be produced from any industrial waste sludge but can be applied specifically for industrial waste sludge that meets emission standards.

The sludge for the recycling material according to the present invention becomes an inorganic sludge which is less than 40% of the content of organic matter, and the moisture content is not particularly limited and can be controlled in the manufacturing process of the recycling material.

When the mineral sludge is prepared, the water content can be measured (S11). If the water content is, for example, 70 or 85 wt% or more, the water content can be adjusted (S12). The moisture content control can be adjusted in the process of being transported through a device such as a conveyor, for example. As the moisture content is properly adjusted during the transfer process, the first solidifying agent may be added. The primary hardener may be at least one selected from, for example, calcium, bentonite, slug powder, anhydrous gypsum, fly ash and cement clinker raw materials. Primary solidifying agent may be added in an amount of 0.5 to 10 wt% of the total weight (S12).

When the inorganic sludge solidifies by the addition of the first solidifying agent, it may be crushed again. The size of the particles to be ground is not particularly limited and may be ground, for example, to have an average diameter of 0.5 to 30 mm. Deodorization process may proceed in the grinding process. The deodorization process may be made by, for example, a method of introducing air into the crushing device or the grinding device.

When the primary crushing and deodorization process is completed (S13) may be mixed while the soil or ocher is added (S14). Soil or loess may be introduced in an amount of 5 to 20 wt% of the total weight, but may be appropriately adjusted depending on the type of industrial waste or the use of the recycling material. Addition and mixing of soil or loess may be carried out using a device such as a stirrer. Soil or loess is intended to control the elastic repulsion coefficient while reducing porosity. Soil or loess, on the other hand, affects the specific moisture absorption rate of the recycled material. Therefore, the amount of soil or loess can be appropriately adjusted in consideration of the use of the recycling material. On the other hand the soil or loess may be added in the form of a powder having an average diameter of 0.1 to 10 mm and advantageously at least 20 wt% or less of the moisture content. The adjustment of the average diameter of the soil or loess is to ensure that the loess and the soil are mixed uniformly.

When the addition and mixing of the earth or sand is completed (S14), a secondary hardener may be added (S15). The secondary hardener may be at least one selected from the group consisting of silica, clay, fly ash, limestone, slaked lime, quicklime, carbide ash, stainless slag, sodium sulfide and magnesium and may be added in an amount of 0.5 to 10 wt%. have. The secondary solidifying agent may have both the function of the solidifying agent and the pH neutralizing agent. Secondary hardeners may be added in constant amounts with stirring, for example by means of devices such as silos. By adding a secondary solidifying agent, the inorganic sludge may be made into a crystalline or bulk form again, and the hygroscopicity and particle size may need to be adjusted according to the use of the recycling material.

According to the present invention, the hygroscopicity can be adjusted by a kneading process (S16). The kneading process can take place in a rotary screw stirrer. Specifically, kneading may be performed for 30 to 60 minutes in a rotary screw stirrer maintaining a temperature of 25 to 50 ℃. In this kneading process, the particles may be sufficiently mixed and solidified. And this can be adjusted to the specific moisture absorption rate (Specific Moisture Absorption Rate) described below.

When the kneading process is completed (S16) may be a particle size control. Particle size control can be carried out in conjunction with the training process or through a separate grinding device. Particle size control may be adjusted to an average diameter of 0.1 to 30 mm in consideration of the use of recycling materials such as fill material, cover material or auxiliary base material.

The embodiment shown in FIG. 1 is exemplary and a recycling material according to the present invention may be produced by various methods or apparatuses, and the present invention is not limited to the present embodiment.

In the following the apparatus for the production of a recycling material according to the invention will be described.

2 shows an embodiment of a device for the manufacture of a recycling material according to the invention.

2, the apparatus for the production of recycled material according to the present invention comprises a control room 21 for measuring the moisture content and controlling the feed rate of industrial waste; At least one hopper 22 into which industrial waste sludge is introduced; A first silo 23 for input of a first solidifying agent; A grinder 24 for grinding and deodorizing industrial waste sludge; A conveying device 25 for conveying the industrial waste sludge treated in the grinder 24; A mixing device 26 for inputting and mixing soil or ocher in the transferred industrial waste sludge; a second silo 27 for inputting a second solidifying agent to the industrial waste sludge transferred from the mixing device 26; And a kneading apparatus 28 for adjusting the particle size while kneading the industrial waste sludge transferred from the second silo 27. It may further comprise a conveyor device for the transfer of industrial waste sludge between different devices.

The industrial waste sludge can be introduced through the hopper 22, and the industrial waste sludge injected is inorganic sludge. The hopper 12 may be at least one, and industrial waste sludge having different moisture contents may be introduced through different hoppers 12. The water content of the industrial waste sludge transferred to the hopper 12 may be measured in advance, and the hopper 12 to be introduced may be determined according to the water content. Alternatively, the moisture content may be pre-adjusted and introduced into the hopper 12 and the pre-adjusted moisture content may be transmitted to the control room 21. The control chamber 21 can determine the transfer rate of the industrial waste sludge or the amount of hardening agent or soil to be added according to the water content.

Through the first silo 23, the primary solidifying agent may be added to the industrial waste sludge to be transported by the conveyor, and the industrial waste sludge may be introduced into the grinder 24 while being solidified. The industrial waste sludge solidified in the grinder 24 may be mixed while being crushed to an appropriate size and transferred to the transfer device 25 through a conveyor.

The industrial waste sludge crushed by the transfer device 25 may be introduced into the mixing device 26 to be mixed with the injection of soil or loess. And industrial waste sludge mixed with soil or loess may be moved using a conveyor, and then a second solidifying agent may be input from the second silo 27. Industrial waste sludge into which the second solidifying agent is added may be kneaded by being fed into the kneading apparatus 28. As described above, the kneading apparatus 28 may be in a rotating manner and may have a mixing function or a drying function. Afterwards, the industrial waste sludge having a particle size control through an appropriate grinder may be converted into a recycling material and used as a fill material, cover material or auxiliary base material.

Hereinafter, a kneading apparatus that can be applied to the production of the recycling material according to the present invention is described.

Figure 3 shows an embodiment of a kneading apparatus that can be applied to the production of the recycling material according to the present invention.

Referring to FIG. 3, the kneading apparatus 30 includes a kneading blade 33a disposed on the frame 31, two rotation shafts 32a and 32b installed inside the frame 31 and the rotation shafts 32a and 32b. 33b), rotational rollers 38a, 38b such as gears or sprockets disposed at one end of the rotary shafts 32a, 32b, power transmission means such as belts or chains connecting the two rotary rollers 38a, 38b ( 39), the drive motor 35 for generating the power required by the rotation shafts 32a, 32b, the speed reducer 36 for reducing the rotational speed of the drive motor 35, and for transmitting the rotational force of the drive motor 35 It may include a drive gear 37.

The kneading blades 33a and 33b may be arranged in a spiral form around the rotation shafts 32a and 32b, and may have a band formed along a circumference and an empty structure inside. Such a kneading blade (33a, 33b) structure has the advantage that the mixing is made inside the kneading blade (33a, 33b) around the rotation axis (32a, 32b) and at the same time facilitate the movement of the mixture. The rotating shafts 32a and 32b may be, for example, 50 to 200 rmp, and the industrial waste sludge may be solidified while being sufficiently mixed with the solidifying agent by the rotation of the kneading blades 33a and 33b. If necessary, a heating device may be installed in the kneading apparatus 30. However, the temperature inside the kneading apparatus 30 may be adjusted by the rotation speeds of the rotation shafts 32a and 32b.

2 and 3 are exemplary and the recycling material according to the present invention may be produced from various industrial waste treatment devices.

Resilient Modulus, Specific Moisture Absorption Rate, and Expansion Rate were measured for recycled materials made from industrial wastes from various industrial sites. The recovery modulus, specific moisture absorption rate and expansion ratio were measured by drying the recycled material so that the water content was 10 wt% or less. The recovery modulus (MR) was determined by repeated loading according to the AASHTO T294-92I test method and the expansion ratio was measured after aging in natural state for 3 months. And the specific moisture absorption rate was measured after drying the rotating recycled material in a rotary heat dryer and made into a granular form to a volume of 1 cm 3 through an extruder and left for 24 hours at a humidity condition of 80% or more. The specific moisture absorption can be expressed as (increase weight / initial weight) × 100. If the specific moisture uptake is high, storage and transportation will be difficult and ground subsidence is likely to occur. Therefore, it was considered advantageous to maintain a low specific moisture absorption rate and thus the specific moisture absorption rate was measured instead of the porosity or moisture absorption rate.

A recycling material was prepared from industrial waste sludge having a water content of 76.3 wt% and an organic content of 16.42 wt% in an industrial A meeting the industrial waste emission standards.

Anhydrous gypsum and fly ash, which is 5 wt% of the total weight, is used as the primary hardener, earth and sand, which is 10 wt% of the total weight, is added, and silica and quicklime, which is 5 wt% of the total weight, are the secondary solidifiers. And a pH neutralizing agent was added to prepare a recycling material. The recovery elastic ratio, the specific moisture absorption rate, and the expansion ratio of the manufactured recycled material were 120, 5, and 0.9%.

A recycling material was prepared from industrial waste sludge having 75.87 wt% of water content and 2.39 wt% of organic matter generated in industrial B site that meet the industrial waste emission standard.

Anhydrous gypsum and slug powder, which is 7 wt% of the total weight, is used as the first hardener, and 8 wt% of the total weight of earth and 2 wt% of loess is added, and 5 wt% of the total weight of silica and Carbide ash was added as a secondary solidifier and a pH neutralizer to prepare a recycling material. The recovery elastic ratio, the specific moisture absorption rate, and the expansion ratio of the manufactured recycled material were 130, 6, and 0.91%.

Recycling materials were prepared from industrial waste sludge with a water content of 68.22 wt% and an organic content of 10.39 wt% generated at the industrial site C that meets industrial waste emission standards.

Bentonite and cement clinker raw material, which is 6 wt% of the total weight, is used as the first solidifying agent, and soil sand, which is 7 wt% of the total weight, is added, and quicklime and stainless steel slag, which is 6 wt% of the total weight, are added. A recycled material was prepared by addition of solidifying material and pH neutralizing agent. The recovery elasticity ratio, specific moisture absorption rate, and expansion ratio of the recycled material thus obtained were 110, 4, and 1.0%.

The recycled material produced has the advantage that it can be used as a cover material, a fill material and an auxiliary base material despite long-term neglect, and does not emit heavy metal components or soil pollutants, so it does not cause a problem of environmental pollution.

Since the recycling material according to the present invention has an appropriate moisture absorption rate, the physical or chemical properties of the material may be maintained during storage or transport so that the recycling material may be easily applied to a construction site of a fill, cover, or auxiliary base material. In addition, the recycling material according to the present invention has the advantage that it has a suitable condition for the environment of the construction site by appropriately adjusting the size of the particles or the size of the pores. In addition, the recycling material according to the present invention has an advantage of being environmentally friendly because it can be produced from industrial waste generated in various industrial sites and does not generate environmental pollutants. In addition, by enabling the recycling of industrial waste generated in large quantities due to the recycling material according to the present invention has the advantage of reducing the social cost due to environmental problems while reducing the construction cost of various construction sites.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention . The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

21: control room 22: hopper
23: first silo 24: grinder
25: conveying device 26: mixing device
27: second silo 28: kneading apparatus
30: kneading apparatus 31: frame
32a, 32b: axis of rotation 33a, 33b: kneading blade
35: drive motor 37: drive gear
38a, 38b: rotary roller 39: power transmission means

Claims (3)

delete delete In the method for producing recycling material for fill material, cover material and auxiliary base material from inorganic industrial waste sludge,
Adding a primary solidifying agent while controlling the feed rate according to the water content of the industrial waste sludge;
Deodorizing while grinding the solidified inorganic sludge;
Adding earth or ocher to the deodorized inorganic sludge;
Adding a secondary solidifying agent to the mixed inorganic sludge; And
Kneading the inorganic sludge with the addition of a secondary hardener,
The primary hardener is at least one selected from calcium, bentonite, slug powder, anhydrous gypsum, fly ash and cement clinker raw materials and the secondary hardener is silica, clay, fly ash, limestone, slaked lime, quicklime, carbide ash, At least one selected from the group consisting of stainless steel slag, sodium sulfide and magnesium.

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