KR100769954B1 - Manufacturing method lightweight aggregate using organic and inorganic waste complexly - Google Patents

Abstract

The present invention relates to a manufacturing method capable of producing lightweight aggregates having excellent physical properties using organic and inorganic wastes that have been treated indiscriminately by conventional landfill and ocean dumping, and more specifically, organic sludge, caking additives and necessity. According to the method for uniformly mixing the physical property enhancer to form a uniform shape and then fire the molded product at high temperature to produce a lightweight aggregate, the firing process until the foam is formed inside the molten film is formed on the outer peripheral surface It relates to a light aggregate production method using a combination of organic and inorganic waste, characterized in that sintering at 1200 to 1350 ℃.

Such lightweight aggregate manufacturing method can convert the inefficient treatment method of organic / inorganic waste that is currently being discharged as industrial waste into an eco-friendly way to recycle it as a raw material of high value-added lightweight aggregate, and has a low defect rate in manufacturing. But there is an advantage that can produce a lightweight aggregate having excellent properties such as low specific gravity, low water absorption, high strength.

Sewage / wastewater sludge, organic and inorganic sludge, calcined, lightweight aggregate.

Description

Manufacturing method of lightweight aggregate using organic and inorganic wastes {MANUFACTURING METHOD LIGHTWEIGHT AGGREGATE USING ORGANIC AND INORGANIC WASTE COMPLEXLY}

The present invention relates to a manufacturing method capable of producing lightweight aggregates having excellent physical properties using organic and inorganic wastes that have been treated indiscriminately by conventional landfill and ocean dumping, and more specifically, organic sludge, caking additives and necessity. According to the method for uniformly mixing the physical property enhancer to form a uniform shape and then fire the molded product at high temperature to produce a lightweight aggregate, the firing process until the foam is formed inside the molten film is formed on the outer peripheral surface It relates to a light aggregate production method using a combination of organic and inorganic waste, characterized in that sintering at 1200 to 1350 ℃.

Currently, organic sludge has been banned from landfilling since July 1, 2003, and most of it is disposed of by ocean dumping. This is different from the basic purpose of converting sewage sludge from direct landfill to recycling and intermediate treatment. Is turning to cheap ocean dumping. However, when the 96 Protocol related to the London Anti-Dumping Convention enters into force, marine dumping will be banned, so that efficient measures are needed.

Among the current treatment methods, the largest proportion of the treatments is at sea dumping recently, and it is sprayed onto the sea by loading barges on the high seas of two East Sea and one West Sea in Korea. The landfill is disposed of after the dumping of sea, and the sewage treatment facilities of each municipality are taken to landfill sites in each region, and industrial waste is disposed of at landfill sites created by waste companies.

Problems that occur in landfills include high moisture content, which leads to problems in ground compaction due to inadequate landfill operations, and leachate and odors do not like to be carried in landfill sites. It is stated in the law. Many treatment methods have been proposed as a solution to the problems of such dumping and landfilling, and the technologies practically used in Korea are incineration, drying and composting.

Incineration started with small capacity in the early 90's, and incineration methods are mostly considered in fluidized and rotary phases. Organic sludge has high water content of more than about 70%, low organic matter content, low heat generation, and the initially installed treatment facility required a lot of energy in operation, and the treatment cost reached 90,000 won / ton.

This problem was developed until the mid-90s, and after the mid-90s, a dry-incineration linkage system was installed under the premise that a drying-incineration linkage system was required, and the waste wood generated in the city at the drying stage was used as an energy source. As a result, it is possible to maintain the treatment costs up to 37,000 ~ 40,000 won / ton.

Most municipalities currently planning incineration are focusing on dry-incineration fluidized bed incineration systems in the case of large-scale treatment.

Recently, another point of view is incineration ash remaining after incineration, and in the case of fly ash, the method of separate treatment is considered in that the hazardous waste is not ignored by designated waste and floor ash.

As yet, there are not many treatment plants based on incineration, and as of the end of 2002, about 550 tons / day of wastewater is treated with 10 incineration systems, including dedicated incineration and municipal waste-linked incineration.

Although there have been many studies on the recycling of organic sludge for agricultural use, promotion has been hindered by various regulations. This is because the fertilizer process standard of the Ministry of Agriculture, Forestry and Fisheries regulates raw materials. Although the actual status is not calculated, some farms and composting companies export organic sludges in small amounts and use them directly on farmland or sell them after composting. In legal terms, it is illegal use.

The composting technology has traditionally been developed based on the composting technology used in the agricultural field, and has been successfully operated as a pilot facility by developing a composting device of siro and multi-stage cylinders suitable for the characteristics of organic sludge. In response to the prohibition of dumping at sea, some local governments are actively reviewing in areas with relatively low concentrations of heavy metals, and small- and medium-sized composting facilities around 30 tons / day are expected to increase.

In the present invention, at least one material selected from the group consisting of clay, mud sludge, waste tailings, and fly ash as a material is used as a material to express strength during molding and firing, and as a physical property enhancer, glass abrasive sludge, waste lime, silica fine powder, Used as incinerators, waste oils, waste cutting oils, and waste paints, they are used as subsidiary materials and physical enhancers. They are very inexpensive and most of the above are classified as wastes and do not have proper treatment. Their effective and stable recycling plan is urgently needed.

The present invention is a technology that can be used as a high value-added lightweight aggregate by using them in combination with the effective treatment of organic-inorganic waste, the lightweight aggregate molded body is sintered at 1200 to 1350 ℃ to form a molten coating on the outer circumferential surface, low absorption rate and easily foam It is possible to manufacture lightweight aggregate with low specific gravity.

Artificial lightweight aggregate is a high value-added construction material that can reduce dead weight, insulation and sound insulation of buildings. When manufacturing lightweight concrete using it, it is possible to reduce the expansion of the member section due to the high-rise structure to light weight, thereby reducing the basic cost. In the case of buildings, it is known that energy savings can be realized due to the improvement of insulation performance. In addition, it is possible to reduce the dependence of the natural aggregates lacking by using lightweight aggregate can be prepared for future aggregate supply.

Recognizing the advantages of lightweight concrete using such lightweight aggregates, developed countries are widely used for housing exterior walls to reduce heating costs and improve sound insulation performance.Wide concrete is widely used not only for general structures but also for special structures such as marine structures. It's happening.

In general, raw materials that can be manufactured from artificial lightweight aggregate include expanded clay, sail, slate, and the like, and the chemical composition of these raw materials is within an easy expansion range during firing.

However, as the raw material that satisfies the conditions for easy expansion in Korea, expanded clay is present in some areas of the budget, Seongro in Gangwon and some areas in Chungbuk, but the amount of chemicals in the same mine area is not only low, It is very difficult to commercialize. On the other hand, due to the limitation of raw material extraction, there have been some plans to add blowing agents to organic or inorganic raw materials for non-expandable ceramic raw materials. It was.

Moreover, in Korea, the market for lightweight aggregates is not properly formed, and most of them are used as foam cement, but are not used in various ways because they are not excellent in physical properties. In the current situation of high fuel and labor costs, it is almost impossible to manufacture lightweight aggregate with mineral resources, so it is very urgent to develop alternative raw materials.

Therefore, in recent years, as the issue of environmental preservation has emerged as a big concern, waste recycling methods have been studied in various ways. By producing light weight aggregates using various wastes such as paper sludge incineration ash, fly ash or slag, and red mud, red mud has been proposed to reduce waste generation and secure economic feasibility. In Korea, about 70 patents on artificial light aggregate using waste have been disclosed and announced by various research institutes and individuals.

However, in Korea, commercial production is difficult due to difficulties in pretreatment of raw materials, lack of demand source, difficulty in controlling specific gravity, and lack of smooth molding technology.In the case of domestic lightweight aggregates, the quality of the aggregate itself is higher than that of foreign countries. It tends to fall off. In particular, due to the difficulty in controlling specific gravity and particle size, poor shape, and high manufacturing cost, the shortage of demand source is emerging.

However, the demand for lightweight aggregates continues to increase in Korea, but currently it is not possible to produce them. Therefore, European aggregates such as Spain and Portugal are being used.

The present invention for improving such a problem is to convert the inefficient treatment method of organic and inorganic waste that is currently discharged as industrial waste into an environmentally friendly method of recycling as a raw material of high value-added lightweight aggregate, in particular the defect rate during manufacturing It is an object of the present invention to provide a lightweight aggregate manufacturing method capable of producing a lightweight aggregate having excellent properties such as low, low specific gravity, low water absorption and high strength.

In order to achieve the above object, the present invention is a method for producing a lightweight aggregate by firing the molded article at a high temperature after molding the organic sludge, caking additives and physical property enhancer uniformly as needed to form a uniform shape, The firing process provides a light aggregate production method using a combination of organic and inorganic waste, characterized in that the molded product is sintered at 1200 to 1350 ℃ until foaming occurs inside and a molten film is formed on the outer peripheral surface.

In particular, the firing step is preferably sintered at 1220 to 1330 ℃.

And it provides a lightweight aggregate manufacturing method using a combination of organic and inorganic waste, characterized in that the step of coating the surface of the molding with an inorganic material after the molding process is added.

In addition, it is preferable to uniformly mix 10 to 90% by weight of organic sludge and at least one binder selected from the group consisting of clay, mud sludge, fly ash and waste tailings.

3 to 20% by weight of at least one physical property enhancer selected from the group consisting of free abrasive sludge, waste lime, silica fine powder, incineration ash, waste oil, waste cutting oil and waste paint, based on the sum of the sewage sludge and the binder. It is preferable to include and mix uniformly.

Hereinafter will be described in detail with respect to the production method of lightweight aggregate using a combination of organic and inorganic waste of the present invention.

Light weight aggregate manufacturing method using the organic and inorganic waste of the present invention comprises a paste manufacturing process, a molding process, a firing process.

First, the paste manufacturing process is a process of uniformly mixing organic and inorganic waste such as organic sludge and caking additives. At this time, the method of mixing the organic sludge, caking additives, etc. is not limited to a large, but it is good to uniformly mix using a mixing apparatus such as a circular extrusion roller mixer, screw.

The organic sludge may use any one selected from sewage sludge, purified sludge, paper sludge, dyed sludge, sugar sludge, leather sludge, or a mixture of two or more selected.

And the binder is to maintain the caking, it may be used by mixing any one selected from clay, mud sludge, fly ash, waste tailings or two or more.

The clay is not particularly limited, and of course, general low-grade clays scattered throughout the country may be used.

In addition, mud sludge refers to by-products such as turbid water, stone dust, etc. generated in construction sludge, dredged soil treated turbidity, stone and aggregate plants, and in this case, by using mud sludge containing approximately 40% or more of silica, aggregates having excellent physical properties are produced. It is preferable.

Above the turbid water is removed by using the washing water to remove the mud powder, unnecessary micro stone powder, etc. attached to the spinning equipment in order to improve the product quality in the production equipment for producing fine aggregates for concrete, and at this time, the fine stone of 75㎛ or less Refers to washing water after washing that contains particles or mud. In the turbid water, mud separated from water by a mechanical equipment for concentrated dehydration such as a concentrator and a filter press, or sedimentation knowledge equipment is concentrated and dewatered to become a mud sludge containing silica and containing water. Such mud sludge does not have a stable mass demand at all times, so it is not possible to expect an increase in the amount of use.

In addition, the crushed stone is classified into a crusher having a particle size of 5 mm or less in a crushing plant of a crushed stone plant by a dry classifier such as an air separator to remove fine particles of 75 μm or less, and collected by a dust collector. It refers to the fine stone particles that are μm. Although the development is progressing to use this as a substitute for limestone powder, which is a mixture of high-flow concrete, the amount of lime powder is insufficient compared to the amount of lime line powder. It is true.

In addition, the dredged soil treated turbidity is a turbid water generated when the dredged soil, which has a high water content, generated when dredging lakes, swamps, rivers, and dam lakes is separated into large and small stones and sand using a sieve classifier. The construction sludge has high water content and high level of moisture generated by civil construction such as underground continuous wall method, water shielding method and high pressure spray stirring method. Say. Most of such dredged soil treated sewage and construction sludge are not only mud cakes due to reduction of water, but also a useful process that leads to reduction of waste from an environmental health point of view is required.

Fly ash used as a caking agent is to secure moldability, reduce moisture content and improve strength, but both bituminous coal fly ash and anthracite fly ash can be used. Anthracite fly ash with a high combustion carbon content is recommended.

In detail, it is possible to use as much as 10 ~ 20% by weight of ignition loss due to unburned carbon generated after coal combustion in thermal power plants or cogeneration plants. Bituminous coal fly ash generated in thermal power plants is almost concrete mixed material. Due to the fact that it is being recycled and the price continues to rise and is sold at a very high price of 20,000 ~ 30,000 won, bituminous coal fly ash generated from thermal power plants is not suitable as a raw material for lightweight aggregate.

The anthracite fly ash has an unburned carbon content of about 15% due to the characteristics of the raw coal, and thus has little effect on adsorbing entrained air bubbles in concrete to reduce the air volume. Fly ash generated from coal is not a coal-only boiler, but the boiler is designed considering the mixed combustion of coal and bunker C oil, so even if the same bituminous coal is used, such as coal-fired power plants, the unburned carbon content is very high as about 15%. Likewise, practical use is rarely achieved.

As such, fly ash, which has a high content of unburned carbon, which is difficult to be used as a mixed material, has a favorable effect on foaming by oxidizing carbon during firing of aggregates, and a reducing atmosphere that is favorable for foaming the atmosphere in the kiln by burning carbon. It is preferable to use fly ash having an unburned carbon content of about 15% or more since it significantly reduces the firing energy.

Waste tailings, which are a by-product of mines, are particulates in the process of crushing, pulverizing, and screening to separate and select useful minerals, and can be used with a specific surface area of 2,000 cm2 / g or more.

At this time, the mixing ratio of the organic sludge and the binder is not particularly limited, but it is preferable to mix 10 to 90% by weight of the organic sludge and 10 to 90% by weight of the binder.

If the organic sludge is less than 10% by weight and the binder is more than 90% by weight, it is difficult to cause foaming due to the lack of organic content in the organic sludge, and the organic sludge is more than 90% by weight and the binder is less than 10% by weight. If it is difficult to form the aggregate itself, even if the molding is difficult to express strength during sintering, it is preferable to mix the organic sludge 10 to 90% by weight, the binder 10 to 90% by weight.

The organic sludge and the binder may be mixed to have a water content of 30 to 45% by weight, or the mixed paste may be dried to have a water content of 30 to 45% by weight. For example, if the amount of organic sludge is small, the water can be used as it is in a dehydrated cake with a water content of 80 to 90% by weight.In the case of a large amount of organic sludge, it is partially dried with a water content of 30 to 60% by weight or completely dried. After crushing and mixing with the dehydrated cake state of water content of 80 to 90% by weight, the total light weight aggregate composition may be used as 30 to 45% by weight.

The reason for mixing or drying the water content of the mixed paste at 30 to 45% by weight is to minimize the energy and drying time consumed during drying by not completely drying the paste as in the prior art, and also as in the molding process. Molding can be performed smoothly without adding water such as water, which simplifies the process, greatly improves the productivity, and allows the mixing amount of organic sludge to be relatively high, thereby maximizing foaming and low specific gravity. This is because the aggregate having excellent physical properties such as low water absorption can be produced.

At this time, the method of drying the paste may be dried using a hot air drum type dryer, etc. At this time, the heat energy of the hot air drum type dryer is preferably minimized by using waste heat generated during the firing process or the cooling process. Do.

On the other hand, in order to improve the formability during the paste manufacturing process, and to produce a lightweight aggregate having excellent physical properties, it is preferable to prepare a paste by mixing a physical property enhancer with an organic sludge and a caking agent.

Examples of the material that can be used as the physical property enhancer include glass abrasive sludge, waste lime, silica fine powder, incineration ash, waste oil, waste cutting oil, and waste paint, and one or two or more selected from them can be mixed and used.

Among them, glass abrasive sludge is waste discharged in the form of inorganic sludge during polishing of plate glass, CRT and optical glass. When mixing glass abrasive sludge during paste manufacturing, melting point is lowered inside the lightweight aggregate and the absorption rate is reduced. It is possible to obtain a lightweight aggregate excellent in physical properties.

Waste lime is an inorganic sludge produced during soda ash manufacturing process, and its main component is CaCO _3, which is separated into CaO and CO ₂ during light aggregate firing, CaO acts as an alkali flux, and the generated CO ₂ gas promotes foaming. It is possible to obtain a lightweight aggregate having excellent physical properties such as reducing specific gravity and water absorption.

The silica fine powder is a source of SiO ₂ to collect the dust generated during the production of silica sand, when used in the manufacture of the paste mixed with the glass of the lightweight aggregate is properly formed to obtain a lightweight aggregate having excellent strength and low absorption rate.

As the incineration ash, various sludge incineration ashes remaining after incineration of organic sludge and the like, and various incineration ashes remaining after incineration of urban industrial waste, etc. may be used. These are currently classified as waste, and most of them are treated by landfill after landfill and solidification treatment, and an appropriate treatment plan is urgently needed. When the incineration material is mixed and used during the paste process, the relative moisture content of organic sludge and the like can be reduced, and the strength of the light weight aggregate can be increased by compact sintering during firing.

And when waste oil, waste cutting oil, and waste paint are mixed and used during the paste process, they provide viscosity and fluidity during molding of the aggregate, and the molding is performed smoothly. In addition, by releasing a large amount of heat to promote internal melting can lower the specific gravity of the lightweight aggregate and increase the strength.

It is preferable to mix the physical property enhancer within the range of 3 to 20% by weight based on the sum of the organic sludge and the caking agent, and when the mixing is less than 3% by weight, it is difficult to expect the effect of improving the physical properties, and 20% by weight. This is because if the mixing exceeds the following problems.

When the glass abrasive sludge is mixed in excess of 20% by weight, the coking force decreases, so that it is not easy to assemble into the aggregate shape, and even when assembled, the glass is fused to each other during firing and the strength of the aggregate decreases.

In addition, when the waste lime is mixed in excess of 20% by weight, the amount of CO ₂ is excessively released to cause foaming and cracks on the surface of the aggregate. Can be.

In the case of mixing more than 20% by weight of silica, the content of SiO ₂ is increased and the foaming of aggregate is not performed properly. This is because in order to cause the foam to foam, the content ratio of Al ₂ O ₃ / SiO ₂ is 0.2 to 0.4, which is because when Al ₂ O ₃ / SiO ₂ is mixed in excess of 20% by weight.

In addition, when the incineration material is mixed in excess of 20% by weight, the density of the aggregate is increased by causing dense sintering during firing of the aggregate, but there is a problem in that the specific gravity of the aggregate is increased due to difficult formation of pores.

When waste oil, waste cutting oil, and waste paint are mixed in excess of 20% by weight, they are excessively burned in the aggregate during firing, causing the gas to escape, causing cracks on the surface of the aggregate, which lowers the strength and increases the specific gravity. There is.

Next, the molding step is a step of molding into a certain shape using a paste, and the molded article can be produced by molding the paste by a usual molding step, but is not limited to any specific molding step.

The paste prepared by the paste manufacturing process is extruded through a vacuum grinder to be molded into a cylindrical shape of a noodle shape, and then, the noodle-shaped molded product is put into a rotating disk to form a spherical pellet, which is uniform. To get pellets of one size.

Specifically, when the noodle-shaped molding is inserted into the disk and rotated at a high speed, the noodle-shaped molding hits the protruding part of the disk outlet and is broken into granules. The broken granule is spherical shaped by high-speed rotation. Is manufactured. At this time, the size of the aggregate can be adjusted by adjusting the nozzle or the mold size when pulling out the noodle-shaped molding through the extruder.

On the other hand, it is preferable to coat the spherical shaped pellets with an inorganic powder having excellent fire resistance. This is to prevent the phenomenon of fusion between the aggregates and the inside of the kiln during the high temperature firing due to the use of a large amount of organic waste.

At this time, the inorganic powder is coated with a thickness of 100 ~ 200㎛ on the surface of the pellet when the pellet is formed by using the inorganic powder and the compact is compacted by the continuous rolling operation.

The pelletized molded body is preferably dried at a temperature of 200 ° C. or lower so that the total moisture content is 20% by weight or less, and more preferably 10% by weight or less. On the other hand, the molded body may be dried using a hot air drum type dryer, and the drying method of the molded body is not limited thereto.

At this time, the heat energy of the hot air drum type dryer is preferably minimized by using waste heat generated during the firing process or the cooling process.

Next, the firing step is a step for firing the molded body at a high temperature so that foaming occurs inside the molded body and a molten film is formed on the outer circumferential surface thereof, and the molded body is preferably molded at 1200 to 1350 ° C.

At this time, when the sintering temperature is less than 1200 ℃, the light aggregate shows unreacted in the kiln, so that the specific gravity, high absorption rate and low strength aggregate are produced, and when it exceeds 1350 ℃, the consumption of fuel cost rises and the manufacturing cost increases. Grain, over-foaming and partial melting phenomenon appear to obtain aggregates with poor physical properties, making it difficult to use as lightweight aggregates.

More preferably, it is preferable to mold the molded body within 1220 to 1330 ° C., because it is possible to obtain aggregate having excellent physical properties.

And the kiln which can be used at the time of the said baking process is not limited to any specific kiln, A rotary kiln, a tunnel type kiln, etc. can be used.

Moreover, a cooling process can be performed after a baking process. Aggregate cooling increases the strength of the aggregate as the speed is slower, but is directly related to productivity, so it passes through the air-cooled chiller and is discharged under 500 ℃ for easy handling.

Hereinafter, the lightweight aggregate manufacturing method using the organic-inorganic waste of the present invention will be described in more detail with reference to the following Examples, the scope of the present invention is not limited to the following examples, the technical features of the present invention Various modifications can be made by those skilled in the art without departing from the scope of the present invention.

Example 1

To 70% by weight of sewage sludge (based on dry weight), 30% by weight of clay was mixed using a circulating compression roller mixer, in which the total moisture content was dried to 34 ± 2% to secure the formability of the aggregate.

The mixture was compressed through a vacuum drill and then prepared in the form of a noodle through extrusion molding and then put into a rotating disk to prepare spherical pellets of 5 mm size, and the formed pellets were dried to have a water content of 10% or less. The dried pellets were then cooled by thermal expansion at 1200 ° C. for 10 minutes.

As a result of testing the obtained artificial lightweight aggregate, specific gravity was 1.34, water absorption was 18.2%, and 10% fine grain fracture test was 7.4 tons.

Example 2

Aggregates were mixed and molded in the same manner as in Example 1, and the formed pellets were thermally expanded at 1210 ° C. for 10 minutes.

As a result of testing the obtained artificial light aggregate, the specific gravity was 1.06, the absorption rate was 13.4%, and the result of 10% fine grain crushing test was 6.7 tons.

Example 3

Aggregates were mixed and molded in the same manner as in Example 1, and the formed pellets were thermally expanded at 1220 ° C. for 10 minutes.

As a result of testing the obtained artificial lightweight aggregate, the specific gravity was 0.68, the absorption rate was 8.3%, and the result of 10% fine grain crushing test was 4.8 tons.

Example 4

Aggregates were mixed and molded in the same manner as in Example 1, and the formed pellets were thermally expanded at 1240 ° C. for 10 minutes.

As a result of testing the obtained artificial lightweight aggregate, the specific gravity was 0.56, the absorption rate was 6.3%, and the result of 10% fine grain fracture test was 4.4ton.

Example 5

Aggregates were mixed and molded in the same manner as in Example 1, and the formed pellets were thermally expanded at 1260 ° C. for 10 minutes.

As a result of testing the obtained light weight aggregate, the specific gravity was 0.48, the absorption rate was 6.6%, and the result of 10% fine grain crushing test was 3.8tons.

Example 6

Aggregates were mixed and molded in the same manner as in Example 1, and the formed pellets were thermally expanded at 1280 ° C. for 10 minutes.

As a result of testing the obtained light weight aggregate, the specific gravity was 0.52, the absorption rate was 7.8%, and the result of 10% fine grain crushing test was 4.0ton.

Example 7

Aggregates were mixed and molded in the same manner as in Example 1, and the formed pellets were subjected to expansion heat treatment at 1300 ° C. for 8 minutes.

As a result of testing the obtained artificial light weight aggregate, specific gravity was 0.65, water absorption was 8.32%, and 10% fine grain crushing test was 4.8ton.

Example 8

Aggregates were mixed and molded in the same manner as in Example 1, and the formed pellets were subjected to expansion heat treatment at 1320 ° C. for 8 minutes.

As a result of testing the obtained artificial lightweight aggregate, specific gravity was 0.79, water absorption was 11.2%, and 10% fine grain fracture test was 5.1 tons.

Example 9

Aggregates were mixed and molded in the same manner as in Example 1, and the formed pellets were subjected to expansion heat treatment at 1330 ° C. for 8 minutes.

As a result of testing the obtained light weight aggregate, the specific gravity was 0.86, the absorption rate was 7.8%, and the result of 10% fine grain crushing test was 6.2ton.

Example 10

Aggregates were mixed and molded in the same manner as in Example 1, and the formed pellets were subjected to expansion heat treatment at 1340 ° C. for 8 minutes.

As a result of testing the obtained artificial lightweight aggregate, the specific gravity was 1.26, the absorption rate was 14.6%, and the result of 10% fine grain crushing test was 7.4ton.

Example 11

Aggregates were mixed and molded in the same manner as in Example 1, and the formed pellets were subjected to expansion heat treatment at 1360 ° C. for 8 minutes.

As a result of testing the obtained light weight aggregate, the specific gravity was 1.37, the absorption rate was 17.3%, and the result of 10% fine grain crushing test was 5.3tons.

Example 12

Unlike Example 1, the pellets were continuously rolled, coated with fly ash, dried, and fired to prepare aggregates.

As a result of testing the obtained artificial lightweight aggregate, the specific gravity was 0.92, the absorption rate was 8.4%, and the result of 10% fine grain crushing test was 6.3ton.

Example 13

Unlike Example 3, the aggregate was prepared by mixing 10% by weight of glass-polishing sludge as a physical property increasing agent with respect to the sum of sewage sludge and clay, followed by molding and calcining.

As a result of testing the obtained artificial light weight aggregate, specific gravity was 0.48, water absorption was 5.8%, and 10% fine grain crushing test was 5.3tons.

Example 14

Unlike Example 3, 5% by weight of waste lime was mixed as a physical property enhancer with respect to the sum of sewage sludge and clay, and then aggregated and manufactured.

As a result of testing the obtained artificial light aggregate, specific gravity was 0.45, water absorption was 7.2%, and the result of 10% fine grain crushing test was 4.9 tons.

Example 15

Unlike Example 3, 5% by weight of silica sand fine powder was mixed as a physical property enhancer with respect to the sum of sewage sludge and clay, and then aggregated and manufactured.

As a result of testing the obtained artificial light aggregate, specific gravity was 0.70, water absorption was 6.7%, and 10% fine grain fracture test was 6.8ton.

Example 16

Unlike Example 3, 10% by weight of the paper sludge incineration material was mixed as a physical property increasing agent with respect to the sum of sewage sludge and clay, and then aggregated and manufactured.

As a result of testing the obtained artificial lightweight aggregate, specific gravity was 0.81, water absorption was 6.3%, and 10% fine grain fracture test was 6.4ton.

Example 17

Unlike Example 3, 10% by weight of waste paint was mixed as a physical enhancer with respect to the sum of sewage sludge and clay, and then aggregated and manufactured.

As a result of testing the obtained light weight aggregate, specific gravity was 0.42, water absorption was 6.9%, and 10% fine grain fracture test was 3.9tons.

Table 1 shows the results of the quality characteristics of the lightweight aggregate obtained by the above example.

Comparative Example 1

Unlike Example 1, the molded pellet was expanded heat-treated at 1140 ° C. for 18 minutes to prepare aggregate.

As a result of testing the obtained artificial lightweight aggregate, the specific gravity was 1.93, the absorption rate was 25.6%, and the result of 10% fine grain fracture test was 1.4 tons.

Comparative Example 2

Unlike Example 1, the molded pellet was expanded heat-treated at 1160 ° C. for 18 minutes to prepare aggregate.

As a result of testing the obtained artificial lightweight aggregate, specific gravity was 1.67, water absorption was 22.3%, and 10% fine grain fracture test was 2.1 tons.

Comparative Example 3

Unlike Example 1, the molded pellet was expanded heat-treated at 1180 ° C. for 15 minutes to prepare aggregate.

As a result of testing the obtained artificial lightweight aggregate, the specific gravity was 1.57, the absorption rate was 19.4%, and the result of 10% fine grain fracture test was 2.4 tons.

[Comparative Example 4]

Unlike Example 1, the molded pellet was expanded and thermally treated at 1190 ° C. for 10 minutes to produce aggregate.

As a result of testing the obtained artificial lightweight aggregate, the specific gravity was 1.73, the absorption rate was 10.3%, and the result of 10% fine grain fracture test was 4.9 tons.

[Comparative Example 5]

Unlike Example 1, the molded pellets were expanded and thermally treated at 1360 ° C. for 8 minutes to prepare aggregates.

As a result of testing the obtained light weight aggregate, the specific gravity was 1.76, the absorption rate was 11.3%, and the result of 10% fine grain fracture test was 6.7tons.

Comparative Example 6

Unlike in Example 1, the molded pellet was expanded and thermally treated at 1380 ° C. for 8 minutes to prepare aggregate.

As a result of testing the obtained artificial lightweight aggregate, specific gravity was 1.89, water absorption was 5.6%, and 10% fine grain fracture test was 7.2 tons.

Comparative Example 7

Unlike Example 1, the molded pellets were expanded and thermally treated at 1400 ° C. for 6 minutes to prepare aggregates.

In this case, the fusion phenomenon was so severe that the quality test of the lightweight aggregate was difficult.

[Comparative Example 8 ~ 10]

In order to grasp the degree of quality characteristics of the lightweight aggregate obtained in the above example, the quality test of the non-structural lightweight aggregate imported from Germany (Liaipor), Spain (Arita), Japan (Mesalite) was carried out. The test results of German lightweight lightweight aggregates showed specific gravity of 0.52, water absorption rate of 24.4%, and 10% fine grain crushing test of 2.1ton. The comparative test of Spanish lightweight aggregates of Comparative Example 9 showed specific gravity of 0.58, water absorption rate of 25.8%, and 10% fine grain value. As a result of the crushing test, the test result of the light weight aggregate of Japan, which is Comparative Example 10, was 0.56, specific absorption rate of 18.8%, and 10% fine grain crushing load of 3.2ton.

Table 2 shows the results of the quality characteristics of the lightweight aggregate obtained by the comparative example.

As confirmed in Examples 1 to 11 and Comparative Examples 1 to 10, when the molded body is subjected to expansion heat treatment in the range of 1200 to 1350 ° C., the aggregate has a specific gravity of 1.34 or less, an absorption rate of 18.2% or less, and a strength of 3.8 or more. Can be obtained.

In particular, it was confirmed in Example 3 to Example 9 that the aggregate can be obtained more excellent aggregate properties when the heat treatment is expanded within the range of 1220 ~ 1330 ℃.

In addition, when the surface of the molded body was coated with an inorganic material as in Example 12 and then subjected to the sintering process, the aggregates did not generate fusion, and lightweight aggregates having low specific gravity, low water absorption, and high strength physical properties could be manufactured.

In the paste manufacturing process, as in Examples 13 to 17, additionally, physical additives such as glass polishing sludge, waste lime, silica fine powder, paper sludge incineration ash, and waste paint are added and mixed, followed by molding and baking to produce lightweight aggregate. In this case, it is confirmed that aggregates having excellent physical properties can be obtained as compared with Examples 1 to 12 without adding a physical property enhancer.

In the case of further mixing of glass polishing sludge, the strength is increased and the specific gravity and the absorption rate are reduced by the melting promotion effect, and when the waste lime is further mixed, the foaming is promoted, the specific gravity is decreased, and the flux component is increased, thereby reducing the absorption rate. Seems to have done.

In addition, when the silica sand powder is further mixed, the amount of glass generated by the increase of the SiO2 component increases, and the strength is increased with the decrease of the absorption rate. When the waste paint is further mixed, it is burned inside the lightweight aggregate to discharge a large amount of gas. In addition to acting as a blowing agent, it is thought to promote the internal melting by releasing a large amount of heat.

As described above, the present invention enables eco-friendly mass treatment of organic and inorganic wastes that have been indiscriminately treated by landfilling and ocean dumping, and is economically and technically more efficient than incineration and melting methods. It can be discharged into aggregate to gain an advantage. By sintering and partially melting and fixing various harmful substances, it is expected to contribute to the development of complex treatment and recycling of organic and inorganic wastes by solving environmental technical difficulties such as environmental harm.

In particular, the method for manufacturing lightweight aggregate using the organic / inorganic waste of the present invention is mixed with organic sludge, caking agent, paste, and then molded and then sintered at 1200 ~ 1350 ℃ to further lower specific gravity, water absorption, and excellent strength. As it is possible to obtain lightweight aggregates, there is an alternative effect of importing lightweight aggregates, which currently rely on imports of foreign imported aggregates.

In addition, by further providing a step of coating the surface of the molded body with an inorganic material, the aggregates can be prevented from occurring due to severe fusion between aggregates during the firing process, as well as preventing the increase of the defect rate, as well as excellent aggregate properties such as low specific gravity, low absorption rate, and high strength. There is an effect that can be obtained.

In addition, by further mixing the physical property enhancer during the paste process to produce a lightweight aggregate through the molding and firing process, by promoting the foaming to reduce the specific gravity and absorption rate, the lightweight aggregate having excellent physical properties, such as the strength is increased by the melt promoting effect There is an effect that can be obtained.

Therefore, in addition to the complex treatment of organic / inorganic wastes, they are used as raw materials for high value-added lightweight aggregates, and the light aggregates discharged as final products are made of lightweight concrete (structural lightweight concrete, lightweight concrete secondary products, deck plate concrete, etc.). , Roof pressed concrete), load reducing materials (roofing for rooftop, roof of underground parking lot, retaining wall filling material) and environmental products (eg ecological block, water treatment carrier, grass green structure, water purification material, pollen stool, roof greening drainage, etc.) The range is available widely.

Claims (5)

10 ~ 90% by weight of organic sludge, 10 ~ 90% by weight of binder, 3 ~ 20% by weight of organic sludge and one or more of waste oil, waste cutting oil, waste paint and glass polishing sludge Mixing a% to prepare a paste having a water content of 30 to 45% by weight; Forming the paste into a constant shape; Drying the molded body with a water content of 20% by weight or less; Sintering the dried molded body at 1200 to 1350 ° C. until foaming occurs inside and a molten film is formed on an outer circumferential surface thereof; And a step of cooling the sintered molded body through an air-cooled cooler to 500 ° C. or less. Light weight aggregate manufacturing method using a combination of organic and inorganic waste, characterized in that it comprises a. The method of claim 1, wherein the process of coating the surface of the molded product with an inorganic material after the molding process is added. delete delete delete