KR970001041B1 - Process for the preparation of light weight aggregate material - Google Patents

Process for the preparation of light weight aggregate material Download PDF

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KR970001041B1
KR970001041B1 KR1019940014730A KR19940014730A KR970001041B1 KR 970001041 B1 KR970001041 B1 KR 970001041B1 KR 1019940014730 A KR1019940014730 A KR 1019940014730A KR 19940014730 A KR19940014730 A KR 19940014730A KR 970001041 B1 KR970001041 B1 KR 970001041B1
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sludge
borax
light weight
aggregate
mixture
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KR1019940014730A
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Korean (ko)
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KR960000803A (en
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김양일
김량
김필수
김영한
서동수
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한국수자원공사
이윤식
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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
    • 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
    • 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
    • C04B18/0418—Wet materials, e.g. slurries
    • 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
    • C04B18/0481—Other specific industrial waste materials not provided for elsewhere in C04B18/00
    • 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)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Sludge (AREA)

Abstract

A sludge from alum of water purifying plant containing 40- 55 wt.% of silicone oxide of the total amount and having an Al2O3/SiO2 ratio less than 1.0 was sintered at a high temperature in the presence of a flux containing a mixture of 32 % of waste glass and 2 % of borax, or a mixture of 15 % of amphibole and 8 % of vorax with 2 % of carbon silicate as a foam generating agent to give the light weight aggregate material.

Description

정수장(淨水場) Alum 슬러지를 주재로한 인공경량(人工輕量)골재의 제조방법Manufacturing method of artificial light weight aggregate based on Alum sludge of water purification plant

제1도는 팽창에 적합한 범위와 정수장 슬러지의 화학 조성 비교표.1 is a comparison table of chemical composition of water treatment sludge with a range suitable for expansion.

제2도는 본 발명의 제조공정 계통도.2 is a manufacturing process flow diagram of the present invention.

본 발명은 정수장(淨水場) 슬러지를 주재로 한 인공경량(人工輕量)골재의 제조방법에 관한 것으로서, 보다 구체적으로는 정수처리공정에서 침전지 및 역세척수(逆洗滌水)의 침전물(沈澱物)을 탈수(脫水) 또는 건조(乾燥)한 슬러지(이하 슬러지라고 한다)를 주재료로 한 인공경량골재의 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing artificial light aggregates based on water purification sludge, and more specifically, sediments of sedimentation basins and backwash water in a water purification process. The present invention relates to a method for producing artificial light aggregate, which is composed mainly of dewatered or dried sludge (hereinafter referred to as sludge).

최근 음용수 및 공업용수 공급의 확대로 인하여 정수처리과정에서 필수적으로 발생되는 정수장 폐기물인 슬러지의 량이 급속히 증가하고 있어 이의 처리문제가 심각한 공해문제로 대두되고 있으며 국내에서 발생되는 정수장 슬러지의 총량은 년간 약 500,000m3이고 폐기물 관리법에서 일반 폐기물로 분류되어 광역관리매립장 또는, 지자체 쓰레기매립장에 매립처분되고 있다.Recently, due to the expansion of drinking water and industrial water supply, the amount of sludge, which is an essential part of water treatment plant waste, is rapidly increasing. 500,000m 3 and are classified as general waste in landfill disposal waste management has become a wide-area managing landfills or municipal landfill.

그러나 매립에 의한 처분은 침출수(浸出水) 및 토양오염에 의한 2차 환경오염을 유발시킬 우려가 있고 또, 현재 매립장의 수명이 다되고 새로운 매립적지의 확보가 어려우며 매립비용의 증가도 예상되므로 이의 재활용이 시급한 실정이다.However, disposal by landfill may cause secondary environmental pollution due to leachate and soil pollution. Also, it is difficult to secure new landfill sites and increase landfill costs. Recycling is urgent.

국내의 정수장에서 상용되는 원수의 오탁물질의 기본을 이루는 화학조성은 실리카(SiO2)가 대부분이고, 이런 오탁물질은 혼화응집공정을 거쳐 침전기의 바닥에 침전되어 기게식 탈수장치시설 또는 자연건조상에 배출되어 슬러지로서 최종 발생된다. 이런 슬러지는 오탁의 기본물질인 실리카(SiO2)와 혼합응집제로서 사용하는 황산알루미늄(Aluminum Sulphate) 또는 폴리염화알루미늄(Poly Aluminum Chloride)의 주성분인 알루미나(Al2O3)로 이루어져 있다.Most of the chemical composition of the raw water pollutants used in domestic water purification plants is silica (SiO 2 ), which is precipitated at the bottom of the precipitator through a mixed agglomeration process. It is discharged to the tank and finally generated as sludge. Such sludge is composed of silica (SiO 2 ), which is a basic substance of soil, and alumina (Al 2 O 3 ), which is a main component of aluminum sulfate or poly aluminum chloride used as a mixed flocculant.

한편, 천연의 골재자원이 점차 고갈되고 있고 특히, 최근에는 콘크리트의 개념이 강하고 무거운 것에서 강하고도 가벼운 콘크리트의 개념으로 변하고 있는 점을 감안하면 경량골재를 사용한 콘크리트는 비중을 감소시킬 뿐만 아니라 경량골재 내부에 무수한 기공들로 인하여 단열, 방음의 효과도 동시에 얻을 수 있는 장점이 있다.On the other hand, natural aggregate resources are gradually being depleted, especially considering that the concept of concrete is changing from the strong and heavy to the strong and light concrete concept. Due to the myriad of pores, there is an advantage that the effect of insulation and sound insulation can be obtained at the same time.

이런 경광골재의 원료로는 천연적으로 산출되는 것으로 팽창점도, 혈암, 진주암, 질석, 화산재등이 있으며, 고로슬래그, 플라이애쉬와 같은 산업폐기물을 이용하는 경우도 있다. 우리나라의 경우는 천연적인 재료가 없고 산업부산물이나 산업폐기물을 이용하여 인공경량골재를 제조하지 않고 있기 때문에 경량골재의 완제품을 수입하여 사용하고 있다. 본 발명자들은 국내에서 발생되는 정수장 슬러지내에 실리카(SiO2)가 다량 함유되어 있다는 사실에 착안하여 정수장 슬러지에 약간의 재료를 혼합사용하므로서 인공경량골재의 제조가 가능한 것을 발견하였다.Raw materials of such hard aggregates are naturally produced, such as expansion viscosity, shale, pearl rock, vermiculite, volcanic ash, and industrial waste such as blast furnace slag and fly ash. In Korea, since there are no natural materials and no artificial lightweight aggregate is manufactured using industrial by-products or industrial waste, finished products of lightweight aggregate are imported and used. The present inventors noticed that a large amount of silica (SiO 2 ) is contained in domestic water purification plant sludge, and found that artificial light aggregate can be manufactured by mixing some materials in the water purification plant sludge.

인공경량골재의 팽창원리(膨脹原理)는 재료가 고온에서 유리화(Glass)되어 점성이 있는 상태로 되고 내부에 존재하는 성분이 분해되어 가스화될 때 이 가스압에 의하여 팽창이 되고 재료의 점성에 의하여 가스가 내부에 구속된다는 것이다. C.M.Riley가 제시한 경량골재의 재료로 한 적합한 조성범위를 나타내는 제1도 도표에서 보면 실리카(SiO2)가 55%에서 75%, 알루미나(Al2O3)가 12%에서 35%, 기타 CaO, MgO, K2O, Na2O, Fe2O3의 총량이 7%에서 22% 범위에 속한다. 한편, 정수장 슬러지는 표 1의 화학조성의 예와 같이 실리카(SiO2)가 42.4% 알루미나(Al2O3)가 34.6%, 기타 CaO, MgO, K2O, Na2O, Fe2O3의 총량이 23.2%로서 실리카의 함량이 약간 부족하나 나머지는 최적 범위에 들고 있다는 것을 알 수 있다.The principle of expansion of artificial lightweight aggregate is that when the material is vitrified at high temperature and becomes viscous, and the components present inside are decomposed and gasified, it is expanded by this gas pressure and the gas is released by the viscosity of the material. Is bound inside. Figure 1 shows a suitable composition range for the lightweight aggregate material presented by CMRiley, showing 55% to 75% silica (SiO 2 ), 12% to 35% alumina (Al 2 O 3 ), and other CaO, The total amount of MgO, K 2 O, Na 2 O, Fe 2 O 3 is in the range of 7% to 22%. Meanwhile, the water treatment plant sludge by silica, as in the examples of the chemical compositions shown in Table 1 (SiO 2) is 42.4% alumina (Al 2 O 3) is 34.6%, other CaO, MgO, K 2 O, Na 2 O, Fe 2 O 3 The total amount of is 23.2%, which shows a slight lack of silica, but the rest is in the optimum range.

따라서 정수장 슬러지는 실리카(SiO)의 함량이 부족하기 때문에 슬러지 자체의 유리화 및 점성이 용이하지 않으나 여기에 페유리, 봉사(Borax), Boric Anhydride (BO), 각섬석(角閃石)등의 융제(融劑)나 SiC 등의 기포발생제를 첨가하여 승온속도 20 내지 40℃/min으로 소성하면, 1000℃보다 유리화가 시작되고 발포하면서 1,050℃에서 거의 유리화가 극대화도어 비중 1.8 이하의 초경량(超輕量)골재의 제조가 가능하여 상기 원리를 만족할 수 있다는 것이 확인되었다. 또, Rotary Kiln에 의한 소성과정(燒成科程)중에 용제의 사용으로 고온에서 유리화된 골재 상호간에 혹은 골재와 로벽간에 서로 달라붙는 현상은 성형된 골재의 표면에 AlO또는, MgO를 코팅제로 사용하면 붙음현상을 방지할 수 있다.Therefore, the sludge itself is not easily vitrified and viscous due to the lack of silica (SiO) content, but it is a flux of pe glass, Borax, Boric Anhydride (BO), and hornblende. Iii) and adding foaming agents such as SiC and firing at a heating rate of 20 to 40 ° C./min, vitrification starts above 1000 ° C., and vitrification is maximized at 1,050 ° C. while the foaming is extremely light. It was confirmed that the production of aggregate is possible to satisfy the above principle. In addition, the sticking of aggregates between vitrified aggregates at high temperatures or between aggregates and furnace walls due to the use of solvents during the firing process by rotary kiln is performed by coating AlO or MgO on the surface of the molded aggregate. Use can prevent sticking.

이하 본 발명을 실시에에 의하여 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the following.

실시예 1Example 1

슬러지의 건조 및 분쇄Sludge Drying and Crushing

슬러지의 물리성을 개선하기 위하여 건조장치로 함수율 20 내지 30%까지 건조시킨후 Disk Mill을 이용하여 100mesh(0.1mm) 이하로 분쇄한다.In order to improve the physical properties of the sludge, the water content is dried to 20 to 30% by a drying apparatus and then pulverized to 100 mesh (0.1 mm) or less using a disk mill.

실시예 2Example 2

혼합재료의 선정 및 혼합비율Selection of mixed materials and mixing ratio

슬러지의 부족한 실리카성분을 보충하고 혼합물의 용융을 촉진하는 물질로서 폐유리를 사용하였으며 또, 우리나라에서 흔하게 부존되어 있는 광물인 각섬석이 융점이 낮은 것에 착안하여 융제로 사용하였다. 표 2는 각섬석의 화학조성 분석결과이다.Waste glass was used as a material to replenish the sludge lack of silica and to promote the melting of the mixture. Also, the hornblende, a mineral commonly present in Korea, was used as a flux due to the low melting point. Table 2 shows the chemical composition analysis of the biotite.

소성온도가 상승하면 에너지면에서 불리하므로 보조 용제로서 붕사(Borax,NaBO.10HO) 또는 Boric Anhydride(BO)를 사용하고 기포발생제로서는 SiC 분말을 사용하였다. 일반적으로 SiC는 안정한 화합물로서 분해온도가 매우 높지만 다른 성분들과 반응하여 낮은 온도에서도 분해되는 것으로 알려져 있다. 본 발명에서는 다음의 혼합비율(건조무게 비율)로 배합하고 적당량의 수분을 첨가하여 슬러지상태로 한 후 계면활성제(界面活性劑)와 Binder(Caboxymetyl Cellulose)를 첨가하여 교반하였다.As the firing temperature increases, borax (Borax, NaBO.10HO) or Boric Anhydride (BO) is used as an auxiliary solvent, and SiC powder is used as a bubble generator. In general, SiC is a stable compound, which has a high decomposition temperature but is known to decompose even at low temperatures by reacting with other components. In the present invention, the mixture was blended in the following mixing ratio (dry weight ratio), and an appropriate amount of water was added to make the sludge, followed by addition of a surfactant and Binder (Caboxymetyl Cellulose).

이하 본 발명의 제조 방법에 사용되는 재료의 혼합 비율은 다음과 같다.Hereinafter, the mixing ratio of the material used in the production method of the present invention is as follows.

1) 실시예 2-11) Example 2-1

2) 실시에 2-22) Implementation 2-2

3) 실시예 2-33) Example 2-3

실시예 3Example 3

성구(成球)A globular

상시에서 혼합된 재료를 골재형태의 Pellet으로 만드는 과정을 성구라 하는데, 본 발명에서는 함수율 25-30%의 혼합물을 드럼식 성구장치에서 성구시킨다.The process of making the material mixed at all times into aggregate pellets is called a script. In the present invention, the mixture having a water content of 25-30% is scripted in a drum-type script apparatus.

실시에 44 to implementation

건조(乾燥)Drying

성구된 상태를 직접 로내에 투입하면 급격한 수분의 증발에 의한 균열이 발생되므로 소성로의 폐열을 이용한 건조로에서 최고 건조온도 150℃ 정도로 충분히 건조를 시킨다.If the spherical state is put directly into the furnace, cracks are generated by rapid evaporation of moisture. So, dry it enough to the maximum drying temperature of 150 ℃ in the drying furnace using waste heat of the kiln.

실시예 5Example 5

소성(燒成)Calcining

소성온도 상승율 20 내지 40℃/min의 속도로 소성온도 1,000℃ 내지 1,075℃에서 3-4시간 소성한다.The firing temperature is fired for 3-4 hours at a firing temperature of 1,000 ° C to 1,075 ° C at a rate of 20 to 40 ° C / min.

상시 실시예 2-1에서 실시예 2-3까지의 결과에서 비중 0.8 이하의 조건을 요약하면 다음과 같다.Summarizing the conditions of specific gravity 0.8 or less in the results of Example 2-1 to Example 2-3 as follows.

상술한 바와 같이 정수처리 폐기물인 슬러지를 이용한 인공경량골재의 제조방법에 의하여 제조된 제품은 점차 천연골재의 고갈이 예상되고, 더구나 경량골재는 전량 수입에 의존하고 있는 점을 감안한다면 획기적인 자원 재활용 방안으로 큰 기대가 되며 본 발명의 효과로는As described above, products manufactured by the method of manufacturing artificial lightweight aggregate using sludge, which is a wastewater treatment waste, are expected to be gradually depleted of natural aggregate, and moreover, light weight aggregate is dependent on imports. It is a great expectation that the effects of the present invention

폐기물의 재활용으로 인한 환경오염 방지 Prevention of environmental pollution by recycling waste

매립장 부족난의 해소 Relief of landfill shortages

정수처리 공정의 원활화 Water Purification Process

정수장 폐기물인 슬러지의 처리비용절감 Reduction of treatment cost of sludge which is a wastewater treatment plant

인공경량골재의 수입대체효과 Import Substitution Effect of Artificial Lightweight Aggregate

토목건축재료로 활용 Used as civil engineering building material

단열벽돌등 건축재료로 활용할 수 있는등의 우수한 효과가 있는 것이다. It can be used as a building material such as insulation bricks, etc.

Claims (2)

정수처리과정에서 폐기물로 발생되는 슬러지 중에서 SiO2의 함량이 전체의 40%∼55%, 화학조성중 Al2O3/SiO2의 비가 1.0 이하인 슬러지를 고온소성하여 인공경량골재를 제조함을 특징으로 하는 정수장 Alum 슬러지를 주재로 한 인공경량골재의 제조방법.The artificial lightweight aggregate is manufactured by high temperature firing of sludge having 40% to 55% of the total SiO 2 content and Al 2 O 3 / SiO 2 ratio in the chemical composition of 1.0 or less. A method for producing artificial light aggregates based on Alum sludge in water purification plants. 제1항에 있어서, 융제로서 폐유리 32%와 Borax 2% 또는 각섬석 15%와 Borax 8%의 비율로 혼합하고, 동 혼합물에 각각 2%의 SiC를 기포발생제로 첨가시켜 제조함을 특징으로 하는 정수장 Alum 슬러지를 주재로 한 인공경량골재의 제조방법.The method according to claim 1, wherein the flux is prepared by mixing 32% of waste glass and 2% of Borax or 15% of hornblende and 8% of Borax, and adding 2% of SiC to the mixture as a foaming agent. Manufacturing method of artificial light aggregate mainly based on Alum sludge of water treatment plant.
KR1019940014730A 1994-06-23 1994-06-23 Process for the preparation of light weight aggregate material KR970001041B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100803513B1 (en) * 2005-11-02 2008-02-14 주식회사 엘지화학 Super light weight ceramic panel and process for preparing the same
KR101123278B1 (en) * 2009-04-08 2012-03-20 이강선 Method of producing lightweight aggregate material with sludge and glass powder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH714443B1 (en) * 2017-12-15 2020-10-15 Reishauer Ag Method and device for measuring a rolling machining tool.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100803513B1 (en) * 2005-11-02 2008-02-14 주식회사 엘지화학 Super light weight ceramic panel and process for preparing the same
KR101123278B1 (en) * 2009-04-08 2012-03-20 이강선 Method of producing lightweight aggregate material with sludge and glass powder

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