KR960011328B1 - Process for preparing lightweight aggregate material using fly-ash - Google Patents

Process for preparing lightweight aggregate material using fly-ash Download PDF

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Publication number
KR960011328B1
KR960011328B1 KR1019930014309A KR930014309A KR960011328B1 KR 960011328 B1 KR960011328 B1 KR 960011328B1 KR 1019930014309 A KR1019930014309 A KR 1019930014309A KR 930014309 A KR930014309 A KR 930014309A KR 960011328 B1 KR960011328 B1 KR 960011328B1
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parts
ash
weight
lightweight aggregate
mixture
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KR1019930014309A
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KR950003212A (en
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차두삼
박병욱
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차두삼
박병욱
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/009—Porous or hollow ceramic granular materials, e.g. microballoons
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/027—Lightweight materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/06—Oxides, Hydroxides
    • C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
    • C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/068—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases from burning wood
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Thermal Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

A lightweight aggregate is prepared by treating flyash as a major component. The process comprises mixing 75-90 wt. parts flyash, 5-15 wt. parts lime powder and 5-10 wt. parts coal powder; adding and blending 20-25 wt. parts water with the mixture; introducing 15-40 vol.% of bubbles by means of a foaming agent with respect to said mixture into the resulting mixture; blending them again for 10-15 mins; pressing and cutting to prepare a spheroidal body; passing through a rotary drying machine; and firing the dried spheroidal body in a rotary kiln at a temperature of 1,180-1,250 deg.C for 3-5 hours, and then cooling.

Description

후라이 애쉬(FLY-ASH)를 주재로 한 고감도 경량골재의 제조방법Manufacturing Method of High Sensitivity Lightweight Aggregate Based on FLY-ASH

본 발명은 석탄을 연소시킨 후 발생되는 SiO2와 Al2O3가 주성분인 후라이 애쉬(FLY-ASH)를 주성분으로 이용하여 고강도의 경량 골재를 제조하는 방법에 관한 것이다.The present invention relates to a method for producing a high-strength lightweight aggregate by using the FRY-ASH (FLY-ASH) is the main component of SiO 2 and Al 2 O 3 generated after burning coal.

주로 국내화력발전소에서 연료로 사용되는 선탄이나 무연탄을 연소시킨 후 발생되는 후라이 애쉬는 산업페기물로서 그대로 방치할 경우 환경오염의 원인이 된다.Fry ash produced after burning coal or anthracite coal used as fuel in domestic thermal power plants is an industrial waste product and causes environmental pollution if left untreated.

이러한 후라이 애쉬를 이용하여 인공골재를 제조하는 방법으로는 영국의 경우 후라이 애쉬 90~95%와 석탄분 5~10%를 이용하여 제조 사용되고 있으나 이 방법에 의해 제조된 인공골재는 밀도가 크고 압축강도가 작기 때문에 고강도의 토목건축재로 적용하기에는 적합하지 않다.As a method of manufacturing artificial aggregate using the frying ash, in the UK, the frying ash is manufactured and used using 90-95% of frying ash and 5-10% of coal powder. However, the artificial aggregate produced by this method has a high density and high compressive strength. Because of its small size, it is not suitable for high-strength civil building materials.

따라서 본 발명은 후라이 애쉬를 주재로하여 고강도 경량 골재를 제조하는 방법을 제공하는 것을 과제로 한다.Therefore, an object of the present invention is to provide a method for producing a high-strength lightweight aggregate based on a frying ash.

상기한 과제를 해결하기 위한 본 발명에 의하면, 후라이 애쉬 75~90중량부, 석회석분 5~15중량부, 석탄분 5~10중량부를 혼합한 후 물을 20~25중량부 첨가하여 혼련시키고, 기포제를 이용하여 발포된 기포를 상기 혼합물에 대해 15~40부피비가 되도록 투입하여 10~15분간 다시 혼련시킨 다음, 압출성형하고 절단하여 연속회전 소성로(Rotary kiln)에서 3~5시간 소성한 다음 냉각시키는 공정들을 포함하는 것을 특징으로 하는 후라이 애쉬를 주재로 한 인공골재의 제조방법이 제공된다.According to the present invention for solving the above problems, 75 to 90 parts by weight of frying ash, 5 to 15 parts by weight of limestone powder, 5 to 10 parts by weight of coal powder are mixed and kneaded by adding 20 to 25 parts by weight of water, The foamed foam using the foaming agent was added to a volume ratio of 15 to 40 to the mixture, kneaded again for 10 to 15 minutes, extruded and cut, and then calcined in a rotary kiln for 3 to 5 hours and then cooled. Provided is a method of manufacturing artificial aggregate based on a frying ash, characterized in that it comprises a process to make.

이하, 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail.

본 발명에서는 석회석 첨가량을 5~15중량부로 하고 소성온도 1180~1250℃에서 3~5시간 소성하므로써 압축강도 280~450㎏/㎤인 고강도의 제품을 얻을 수가 있다.In the present invention, the amount of limestone added is 5 to 15 parts by weight and calcined for 3 to 5 hours at a firing temperature of 1180 to 1250 ° C. to obtain a high strength product having a compressive strength of 280 to 450 kg / cm 3.

또한 석탄분은 구상체로 성형 건조시에 점력(粘力)에 의한 접착성형을 용이하게 하며, 소성시에 연소되어 연소가스의 방출에 의한 공극을 구상체 내에 형성시켜 경량화를 더욱 향상시키며 또한 연소열은 구상체의 소성을 촉진시키는 작용을 한다.In addition, coal powder is spherical body, which facilitates adhesive molding by viscous force during molding and drying, and burns during firing to form voids in the spherical body due to the release of combustion gas, further improving the weight reduction. It acts to promote plasticity of the globular body.

기포는 구상체내에 공극을 형성시켜 경량화하기 위하여 배합한 것으로서, 기포를 형성시키기 위하여 사용되는 기포제는 기포생성후 후라이애쉬-석회석분-석탄분 혼련물의 초결이 이루어질 때까지 3~6시간 동안 장시간 기포를 유지시키므로써 성형 및 건조시에 제품속에서 기포에 의한 공극(空隙)을 유지시킬 수가 있도록 하는 것이 바람직하다. 이러한 효과가 있는 기포제의 시중구입 가능한 예로는 동물성 단백질계 기포제인 NEOPOR-400(NEOPOR SYSTEM GMBH사 제품)을 들 수 있다.Bubbles are formulated to reduce voids by forming voids in the globular body, and the foaming agent used to form bubbles is bubbled for a long time for 3 to 6 hours until foaming of frying ash-limestone powder-coal powder mixture is made after foaming. It is desirable to maintain the voids caused by bubbles in the product during molding and drying. Commercially available examples of foaming agents having such an effect include NEOPOR-400 (product of NEOPOR SYSTEM GMBH), an animal protein foaming agent.

본 제조방법에 있어서, 기포량을 15~40부피비로 조절하는 것이 요구되는데, 그 이유는 상기한 범위내에서 기포량을 조절하면 제품의 밀도를 0.6~1.2G/㎤ 범위에서 조절할 수 있기 때문이다.In the present manufacturing method, it is required to adjust the bubble amount to 15 to 40 volume ratio, because if the bubble amount is adjusted within the above range, the density of the product can be adjusted in the range of 0.6 ~ 1.2G / cm3. .

이와 같은 본 발명의 인공골재는 일반적으로 사용되어온 자연 혹은 파쇄골재나 종래 제조되어온 외국산 인공골재에 비하여 밀도가 작고 압축강도가 크기 때문에, 고강도 경량시멘트 콘크리트를 제조할 수 있으며, 콘크리트 구조물, 철구조물 등을 대폭적으로 절약 간소화시킬 수 있다. 또한, 산업폐기물을 재활용하여 환경오염을 방지할 수 있기 때문에 일석이조의 효과가 있는 것이다.Such artificial aggregate of the present invention has a low density and high compressive strength as compared with natural or crushed aggregates or foreign-made aggregates that have been conventionally manufactured, and thus can produce high strength lightweight cement concrete, concrete structures, steel structures, etc. This greatly simplifies savings. In addition, because it is possible to prevent the environmental pollution by recycling industrial waste, there is an effect of two stone trillion.

이하 본 발명을 실시예를 통하여 더욱 구체적으로 설명하겠는 바, 실시예에 의해 본 발명이 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by Examples.

실시예Example

후라이 애쉬 85중량부, 석회석분 10중량부, 석탄분 5중량부를 혼합기에서 균일하게 혼합한 후에, 물 20중량부를 첨가하여 혼련기에서 혼련시킨 다음, 기포제로 발포시킨 기포량이 25부피비가 되도록 기포제를 첨가하여 15분간 혼련시킨 후, 압출기에 넣어서 압출성형을 하여 일정한 크기로 절단하여 회전건조기를 통과시키면서 구상체로 만들었다.After mixing 85 parts by weight of frying ash, 10 parts by weight of limestone powder and 5 parts by weight of coal in a mixer, add 20 parts by weight of water and knead them in a kneader, and then foam the foaming agent so that the amount of bubbles foamed with the foaming agent becomes 25 volume ratio. The mixture was added and kneaded for 15 minutes, then extruded into an extruder, cut into a predetermined size, and spherical through a rotary dryer.

이후에 연속회전 소성로에서 1200℃정도의 온도에서 4시간 정도 소성한 다음 냉각시켜 고강도의 후라이 애쉬 경량 골재를 제조하였다.After the firing for about 4 hours at a temperature of about 1200 ℃ in a continuous rotary kiln and then cooled to prepare a high strength fried ash lightweight aggregate.

상기 실시예에서 제조된 고강도 후라이 애쉬 인공 경량 골재의 물성을 자연골재와 시판되고 있는 영국산 후라이 애쉬 인공골재의 물성과 비교하여 다음 표 1에 나타내었다.The physical properties of the high-strength fried ash artificial lightweight aggregate manufactured in the above embodiment is shown in Table 1 below in comparison with the physical properties of natural aggregates and British fried ash artificial aggregates.

※밀도 및 압축강도값은 무작위 추출한 시험품 100개를 완전 건조한 상태에서 측정한 평균치임.※ Density and compressive strength values are the average values of 100 randomly sampled specimens in a completely dry condition.

상기 표 1에 나타난 바와같이 본 발명제품은 자연골재나 영국산 인공골재에 비하여 밀도가 매우 작으면서도 압축강도는 높기 때문에 경량 및 고강도 콘크리트의 충전재로서 매우 적합하여서 고층 건물의 구조 콘크리트, 경량단열재 및 패널재료 등으로 매우 유용하다.As shown in Table 1, the present invention is very suitable as a filler for lightweight and high-strength concrete because the density is very low and the compressive strength is high compared to natural aggregate or artificial artificial aggregate from the United Kingdom, so the structural concrete, lightweight insulation and panels of high-rise buildings Very useful as a material.

Claims (2)

후라이 애쉬를 주재로 한 인공골재를 제조함에 있어서, 후라이 애쉬 75~90중량부, 석회석분 5~15중량부, 석탄분 5~10중량부를 혼합한 후 물을 20~25중량부 첨가하여 혼련시키고, 기포제를 이용하여 발포된 기포를 상기 혼합물에 대해 15~40부피비가 되도록 투입하여 10~15분간 다시 혼련시킨 다음, 압출성형하고 절단하여 회전건조기를 통과시키면서 구상체로 만들어서 1180~1250℃에서 3~5시간 연속회전 소성로에서 소성한 다음 냉각시키는 공정을 포함하는 것을 특징으로 하는 후라이 애쉬를 주재로 한 고강도 경량 골재의 제조방법.In the manufacture of artificial aggregates based on frying ash, 75 to 90 parts by weight of frying ash, 5 to 15 parts by weight of limestone powder and 5 to 10 parts by weight of coal powder are mixed and kneaded by adding 20 to 25 parts by weight of water. Using foaming agent, the foamed foam is added to the mixture at a volume ratio of 15 to 40, and then kneaded again for 10 to 15 minutes, and then extruded and cut into spherical bodies while passing through a rotary dryer. A method for producing a high strength lightweight aggregate based on a frying ash, characterized in that it comprises a step of firing in a continuous rotary kiln for 5 hours and then cooling. 제1항에 있어서, 상기 기포제가 기포생성후 후라이애쉬-석회석분-석탄분 혼련물의 초결이 이루어질 때까지 3~6시간 동안 장시간 기포를 유지시킬 수 있는 것임을 특징으로 하는 후라이 애쉬를 주재로 한 고강도 경량 골재의 제조방법.According to claim 1, wherein the foaming agent is a high-strength predominantly based on the fry ash, characterized in that the foam can be maintained for a long time for 3 to 6 hours until the foaming of the frying ash-limestone powder-coal powder mixture is formed Method for producing lightweight aggregate.
KR1019930014309A 1993-07-27 1993-07-27 Process for preparing lightweight aggregate material using fly-ash KR960011328B1 (en)

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KR960011328B1 true KR960011328B1 (en) 1996-08-22

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Cited By (1)

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KR100799238B1 (en) * 2006-04-28 2008-01-29 (주)쎄라그린 Method for Manufacturing an Artificial Lightweight Aggregate Containing Bottom Ash

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KR20040000818A (en) * 2002-06-25 2004-01-07 김현영 Method of removing unburnt coal powder in flyash and apparatus of the same
US8961684B2 (en) 2009-09-24 2015-02-24 Ash Improvement Technology Inc. Production of coal combustion products for use in cementitious materials
EP2480513A1 (en) * 2009-09-24 2012-08-01 ASH Improvement Technology, Inc. Production of cement additives from combustion products of hydrocarbon fuels and strength enhancing metal oxides
US9365451B2 (en) 2009-09-24 2016-06-14 Ash Improvement Technology Inc. Cement additives produced by combustion of coal with clay and slag

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100799238B1 (en) * 2006-04-28 2008-01-29 (주)쎄라그린 Method for Manufacturing an Artificial Lightweight Aggregate Containing Bottom Ash

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