JP2007223841A - Method for producing artificial aggregate using waste slag as main raw material - Google Patents
Method for producing artificial aggregate using waste slag as main raw material Download PDFInfo
- Publication number
- JP2007223841A JP2007223841A JP2006046516A JP2006046516A JP2007223841A JP 2007223841 A JP2007223841 A JP 2007223841A JP 2006046516 A JP2006046516 A JP 2006046516A JP 2006046516 A JP2006046516 A JP 2006046516A JP 2007223841 A JP2007223841 A JP 2007223841A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- parts
- aggregate
- raw material
- waste
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
この発明は汚泥溶融スラグや焼却灰スラグの有効利用に関すると共に、天然骨材枯渇の現状に鑑み、代替可能な人工骨材とその製造方法を提供するものである。 The present invention relates to effective utilization of sludge molten slag and incinerated ash slag, and in view of the current situation of natural aggregate depletion, provides an alternative artificial bone and a method for producing the same.
特開平6−166579は石炭灰の有効利用に関するもので、石炭灰相互の結合に廃棄物スラグを使用し、廃棄物スラグの溶融物が石炭灰にふくまれる空気膨張により発泡させた軽量骨材に関するものであった。スラグ溶融物で石炭灰粒子間を充填させているにすぎないから、好ましい配合割合では石炭灰100部に対してスラグ溶融物の含有量は多くても40部を越えず、廃棄物スラグの消費観点からは必ずしも好ましい利用途のものではなく、また、石炭灰とスラグ溶融物のバインダーの間の膨張係数の相違などから微細なクラックが発生しやすく、製造した骨材は圧壊強度が高い軽量人工骨材とはなりえなかった。 JP-A-6-166579 relates to the effective use of coal ash, and relates to a lightweight aggregate in which waste slag is used for coal ash mutual bonding, and the melted waste slag is foamed by air expansion that is contained in coal ash. It was a thing. Since the slag melt is merely filled between the coal ash particles, the preferred blend ratio does not exceed 40 parts of slag melt per 100 parts of coal ash, and waste slag consumption. From the viewpoint, it is not necessarily a preferred application, and fine cracks are likely to occur due to the difference in expansion coefficient between the coal ash and slag melt binders, and the manufactured aggregate is a lightweight artificial with high crushing strength. It couldn't be aggregate.
従来、各地の下水処理場から発生する下水汚泥はそのまま埋立投棄すると衛生上あるいは悪臭公害上問題があるので焼却処分され、ごみ焼却場から発生する焼却灰などと同様、埋立投棄されているが、埋立用地確保が難しくなってきているうえに、焼却灰からの重金属の溶出など、その埋立処分にともなう二次公害が大きな社会問題となった。その後、これら焼却灰の多くは減溶化と安定化のためにさらに溶融スラグ化されているが、その多くは埋め立て処分に回されており、有効利用されているとは言えない現状がある。従って、下水汚泥、一般廃棄物もしくは産業廃棄物の有効利用として、枯渇化が叫ばれている川砂利などの天然骨材の代替品として提供することが本発明が解決しようとする課題であり、さらに言えば、圧潰強度で5KN 以上の性能をもつ人工骨材の提供が、本発明の解決しようとする課題である。 Conventionally, sewage sludge generated from various sewage treatment plants has been disposed of in landfills as it is disposed of in landfills because of sanitary or odor pollution problems. In addition to the difficulty in securing land for landfill, secondary pollution caused by landfill disposal, such as elution of heavy metals from incineration ash, has become a major social problem. Since then, most of these incineration ash has been further melted and slagged to reduce and stabilize it, but most of it has been sent to landfills and cannot be said to be used effectively. Therefore, as an effective use of sewage sludge, general waste or industrial waste, it is a problem to be solved by the present invention to provide as an alternative to natural aggregates such as river gravel that is being depleted. Furthermore, the provision of an artificial aggregate having a crushing strength of 5 KN or more is a problem to be solved by the present invention.
汚泥溶融スラグや焼却灰スラグを粘結剤を使って石炭灰等と共に混ぜ込み、造粒して焼結させた、いわゆる焼き物を造ることは容易に着想されるところである。しかしながら、この焼成物の強度で見ると、焼成温度1100℃では焼結による結合は弱く、1200℃以上では汚泥溶融スラグや焼却灰スラグ自体が溶融軟化して、焼き物としての形状を保持できなくなるなどの現象が生じるが、いずれにしてもその焼成物の強度は弱く、例えば、人工骨材として利用することはできなかった。 It is easily conceived to make a so-called pottery product in which sludge molten slag or incinerated ash slag is mixed with coal ash using a binder, granulated and sintered. However, when viewed from the strength of the fired product, bonding by sintering is weak at a firing temperature of 1100 ° C., and at 1200 ° C. or higher, sludge molten slag or incinerated ash slag itself melts and softens, making it impossible to maintain the shape of the fired product. However, in any case, the strength of the fired product was weak, and for example, it could not be used as an artificial aggregate.
しかし、本発明者は、これら焼却灰スラグや汚泥溶融スラグを石炭灰や廃粘土などと、一定の割合で混合し、20〜100μmの粒径に微粉砕したのち、造粒し、焼成スケジュールとして例えば、室温から焼成温度の1200℃迄を2時間、更に焼成温度域で2時間保持すれば、微粉砕した焼却灰スラグや汚泥溶融スラグの表面から灰長石の結晶生成があること、この灰長石が軟化するスラグの粘性を高め、軟化したスラグが石炭灰どうし、もしくは廃粘土どうしを結合させるバインダーの役割して、強度をもつ骨材ができることを発見した。 However, the inventor mixed these incineration ash slag and sludge molten slag with coal ash and waste clay at a certain ratio, pulverized to a particle size of 20 to 100 μm, granulated, and as a firing schedule For example, if the temperature is kept from room temperature to 1200 ° C. for 2 hours and further in the firing temperature range for 2 hours, anorthite crystals are generated from the surface of finely pulverized incinerated ash slag and sludge molten slag. Has increased the viscosity of softened slag, and it has been discovered that the softened slag can act as a binder that binds coal ash or waste clay together to form a strong aggregate.
X線回折測定に依れば、焼成スケジュール(熱処理)として、室温から1200℃まで2時間を掛け、1200℃に2時間保持した後に放冷した2mm角形状の廃棄物スラグ試料では、結晶のピークは少ししか見られないが、60μm中心粒径に粉砕した粉末を原料とした試料には結晶のピークが明確に見られる。即ち、粉末にした効果によって灰長石の結晶が析出したことが分かる。 According to the X-ray diffraction measurement, as a firing schedule (heat treatment), 2 hours from room temperature to 1200 ° C was held for 2 hours and then cooled for 2 hours. The crystal peak is clearly seen in a sample made from powder pulverized to a center particle size of 60 μm. That is, it can be seen that anorthite crystals were precipitated by the effect of powdering.
1200℃では、廃棄物スラグ単独を原料とすると試料は軟化変形を示し、いったん部分的に析出したアノルサイト結晶は消失するが、廃粘土、石炭灰などの粘土成分を含む材料と混練することによって廃棄物スラグのマトリック層の灰長石化が1200℃においても実質的に促進されていることが分かる。 At 1200 ° C, when the waste slag alone is used as a raw material, the sample shows softening deformation, and the anorthite crystals that have partially precipitated once disappear, but are discarded by kneading with materials containing clay components such as waste clay and coal ash. It can be seen that the anorthite formation of the matrix layer of material slag is substantially accelerated even at 1200 ° C.
汚泥溶融スラグの粉末に石炭灰を混ぜて行くと、1100℃程度で汚泥溶融スラグ成分が石炭灰と反応してアノルサイトを生成する。石炭灰の割合が増加すると、焼成温度が1200℃になっても焼成物は軟化することがなくなる。スラグマトリックスに介在するアノルサイト結晶の働きによって、汚泥溶融スラグや石炭灰単独では期待できない焼結強度が生まれ、強度のある焼成物、即ち高強度な人工骨材を造ることができる。 When coal ash is mixed with the sludge molten slag powder, the sludge molten slag component reacts with the coal ash at about 1100 ° C. to generate anorcite. When the proportion of coal ash increases, the fired product will not soften even when the firing temperature reaches 1200 ° C. Sintering strength that cannot be expected with sludge molten slag or coal ash alone is produced by the action of anorthite crystals intervening in the slag matrix, and a strong fired product, that is, a high-strength artificial bone can be produced.
表1は汚泥溶融スラグの混合割合と焼成温度が強度(圧潰強度)に及ぼす影響を表したものである。圧潰強度は原料割合の汚泥溶融スラグ量が増すほど、また、焼成温度が高いほど高い値を示すが、スラグが軟化溶融、発泡する熱処理条件になると強度は減少する。絶乾比重も強度と同じ傾向を示し、汚泥溶融スラグ量が増すほど、比重は大きくなる。汚泥溶融スラグが軟化溶融、発泡する条件になると比重は小さくなる。吸水率の傾向も比重の傾向に一致している。いずれにしても汚泥溶融スラグの含有量によって人工骨材の性状が変わることになる。 Table 1 shows the influence of the mixing ratio of the sludge molten slag and the firing temperature on the strength (crush strength). The crushing strength increases as the amount of sludge melted slag in the raw material ratio increases and the firing temperature increases. However, the strength decreases when the heat treatment conditions allow the slag to soften, melt and foam. The absolute dry specific gravity shows the same tendency as the strength, and the specific gravity increases as the sludge melt slag amount increases. When the sludge melt slag is softened, melted and foamed, the specific gravity is reduced. The trend of water absorption is consistent with the trend of specific gravity. In any case, the properties of the artificial aggregate change depending on the content of the sludge molten slag.
本発明の人工骨材の製造方法について記述する。 The manufacturing method of the artificial aggregate of this invention is described.
20〜100μmの粒径に微粉砕した汚泥溶融スラグと焼却灰スラグ及び石炭灰に粘結剤としてベントナイトを加え、水を加えて混練、造粒する。造粒物を乾燥し、焼成すれば、軽量かつ高強度の粒状骨材が得られる。実際の製造工程では、汚泥溶融スラグと焼却灰スラグ100部(重量割合)に対して石炭灰20〜100部、粘結剤としてベントナイトを5〜40部に水を加えて混練し、造粒機を通して直径5〜20mmの球状成形体を造る。この球状成形体を乾燥させた後、焼成窯に入れて、焼成温度域までに所定の時間をかけ、焼成温度1200℃に一定時間保持し、その後焼成品を放冷する。焼成品即ち圧潰強度 6〜10 KNの人工骨材を得た。 Bentonite is added as a binder to sludge molten slag, incinerated ash slag and coal ash finely pulverized to a particle size of 20 to 100 μm, and water is added to knead and granulate. If the granulated product is dried and fired, a lightweight and high-strength granular aggregate can be obtained. In an actual manufacturing process, 20-100 parts of coal ash is added to 100 parts (weight ratio) of sludge molten slag and incinerated ash slag, and 5-40 parts of bentonite as a binder is added and kneaded, and a granulator A spherical shaped body with a diameter of 5 to 20 mm is made through After the spherical shaped body is dried, it is put in a firing kiln, a predetermined time is taken until the firing temperature range, the firing temperature is maintained at 1200 ° C. for a certain time, and then the fired product is allowed to cool. A fired product, that is, an artificial aggregate having a crushing strength of 6 to 10 KN was obtained.
原料は廃棄物スラグ、粘土材及び粘結剤である。廃棄物スラグとは下水汚泥溶融スラグ、一般廃棄物焼却灰溶融スラグ、転炉スラグなどの比較的CaOの含有量が多い溶融スラグを言う。粘土材とは廃粘土、石炭灰など比較的SiO2とAl2O3の含有量が多いものを言いう。また、粘結剤とは廃棄物スラグ及び粘土材の調合粉体を造粒するのに必要な粘性を付与するものを言い、ベントナイトなどの粘土及びメチールセルローズなどの有機バインダーが用いられる。製造に際してはこれら原料が秤量され、縦ミル、ボールミルなど粉砕機で中心径で約30μm程度に混合粉砕される。 The raw materials are waste slag, clay material and binder. Waste slag refers to molten slag having a relatively high content of CaO, such as sewage sludge molten slag, general waste incinerated ash molten slag, and converter slag. The clay material is a material having a relatively large content of SiO2 and Al2O3 such as waste clay and coal ash. Further, the binder means a material that imparts a viscosity necessary for granulating the mixed powder of waste slag and clay, and clay such as bentonite and organic binders such as methyl cellulose are used. In production, these raw materials are weighed and mixed and pulverized to a center diameter of about 30 μm by a pulverizer such as a vertical mill or a ball mill.
前記3原料を造粒成形するために、加える水の量は約30%以下で、その量は混合、混練、造粒機の特性により決まるが、乾燥工程に要する時間を短縮するためには、できるだけ水分が少ない方がよい。造粒機としてはパン型も加圧押し出し型のものも利用できる。 In order to granulate and form the three raw materials, the amount of water to be added is about 30% or less, and the amount is determined by the characteristics of the mixing, kneading, and granulator, but in order to shorten the time required for the drying process, It is better to have as little moisture as possible. As the granulator, a pan type or a pressure extrusion type can be used.
球状成形体の焼成機としては、コスト面からロータリーキルンが望ましいが、シャトルキルン、トンネルキルンなどでもよい。焼成スケジュールでは室温から焼成温度迄に2時間を掛け、1000〜1200℃の焼成域で2時間を掛けた。その後放冷し、粒状の人工骨材を得た。この骨材の性能は絶乾比重2程度、吸水率1%以下、圧潰強度 6kN以上である。 A rotary kiln is desirable as a firing machine for the spherical molded body from the viewpoint of cost, but a shuttle kiln, a tunnel kiln or the like may also be used. In the firing schedule, it took 2 hours from room temperature to the firing temperature, and 2 hours in the firing zone of 1000 to 1200 ° C. Thereafter, the mixture was allowed to cool to obtain a granular artificial aggregate. This aggregate has an absolute dry specific gravity of about 2, a water absorption rate of 1% or less, and a crushing strength of 6 kN or more.
本発明者は上記の事実に基づき本発明を完成した。即ち、廃棄物スラグ100部(重量割合)に対して粘土成分20〜100部、粘結剤5〜40部からなる原料を粉砕し、混練し、造粒した後、1100℃〜1250℃で焼成する人工骨材の製造方法。 The present inventor completed the present invention based on the above facts. That is, after pulverizing, kneading and granulating a raw material consisting of 20 to 100 parts of a clay component and 5 to 40 parts of a binder with respect to 100 parts (weight ratio) of waste slag, firing is performed at 1100 to 1250 ° C. To manufacture artificial aggregate.
請求項1記載の原料に発泡剤0.5〜5部を添加した、請求項1記載の人工軽量骨材の製造方法。 The manufacturing method of the artificial lightweight aggregate of Claim 1 which added 0.5-5 parts of foaming agents to the raw material of Claim 1.
請求項1もしくは請求項2記載の製造法を用いて製造した焼成物のマトリックス層に主として灰長石を析出してなる人工骨材もしくは人工軽量骨材。 An artificial aggregate or an artificial lightweight aggregate obtained by mainly depositing anorthite on a matrix layer of a fired product produced by using the production method according to claim 1 or 2.
廃棄物スラグ100部(重量割合)に対して粘土成分が20〜100部に限定される理由は、20部に満たないと粘土成分を加える効果が少ない。100部を越えると強度ある人工骨材が得られない。 The reason why the clay component is limited to 20 to 100 parts with respect to 100 parts (weight ratio) of the waste slag is that the effect of adding the clay component is less than 20 parts. If it exceeds 100 parts, a strong artificial aggregate cannot be obtained.
廃棄物スラグ100部(重量割合)に対して粘結剤が5〜40部に限定される理由は、5部に満たないと造粒が難しく、20部を越えると人工骨材の強度を低下させる恐れがある。 The reason why the binder is limited to 5 to 40 parts with respect to 100 parts (weight ratio) of waste slag is that granulation is difficult if it is less than 5 parts, and if it exceeds 20 parts, the strength of the artificial aggregate is reduced. There is a fear.
本発明の上記の説明は粗骨材の製造を主としているが、成形体のサイズを変えることにより、土管などの大型形状の窯業製品或いは、焼成された人工骨材を粉砕することで細骨材の製造も可能であることは当然である。 Although the above description of the present invention is mainly for the production of coarse aggregates, fine aggregates can be obtained by crushing large-sized ceramic products such as clay pipes or fired artificial aggregates by changing the size of the compact. Of course, it is also possible to manufacture.
本発明の骨材は、市販の産業廃棄物を主成分とする軽量骨材ではなく、むしろ強度の大きい天然の砂利に類似しており、而もかなり軽量なので、コンクリート構造体の重量低減が可能となり、建築物のコストを低減させることができる。 The aggregate of the present invention is not a lightweight aggregate mainly composed of commercially available industrial waste, but rather resembles natural gravel with a high strength, and is quite lightweight, so that the weight of the concrete structure can be reduced. Thus, the cost of the building can be reduced.
本発明の骨材を実際に製造した。廃棄物スラグの下水汚泥スラグ100部(重量合)と粘土成分の石炭灰30部、粘結剤としてのベントナイト5部をボールミル混合機に入れ混合粉砕して、中心粒径50μm程度まで微粉砕したものに水を加えて混練して坏土とした。この坏土を造粒機で造粒して、直径約10mmの球状成形体を得た。この造粒物を乾燥機で乾燥させた後、ロータリーキルンに入れ、1200℃までを2時間、1200℃に2時間保持し、その後放冷した。 The aggregate of the present invention was actually manufactured. Waste slag, 100 parts (by weight) of sewage sludge slag, 30 parts of clay ash, and 5 parts of bentonite as a binder were mixed and ground in a ball mill mixer, and pulverized to a center particle size of about 50 μm. Water was added to the material and kneaded to make a clay. This kneaded material was granulated with a granulator to obtain a spherical molded body having a diameter of about 10 mm. After this granulated product was dried with a dryer, it was put in a rotary kiln, held at 1200 ° C. for 2 hours and 1200 ° C. for 2 hours, and then allowed to cool.
このようにして製造した人工骨材は、圧壊強度9N、比重1.9、吸水率0.3%の性状を示す球形の人工骨材であった。 The artificial aggregate thus produced was a spherical artificial aggregate exhibiting properties of a crushing strength of 9 N, a specific gravity of 1.9, and a water absorption rate of 0.3%.
この発明は大量の廃棄物スラグを有効に利用するので、それ自体が環境負荷低減に貢献することになるが、天然骨材枯渇の現状を見るとき、本発明によって、代替骨材の提供ができることは、地球環境の保全に資するところが大であると考えている。
Since the present invention effectively uses a large amount of waste slag, it itself contributes to reducing the environmental load. However, when looking at the current situation of natural aggregate depletion, the present invention can provide an alternative aggregate. Believes that it contributes greatly to the conservation of the global environment.
Claims (3)
An artificial aggregate or an artificial lightweight aggregate obtained by mainly depositing anorthite on a matrix layer of a fired product obtained by molding and firing the raw material according to claim 1 or 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006046516A JP2007223841A (en) | 2006-02-23 | 2006-02-23 | Method for producing artificial aggregate using waste slag as main raw material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006046516A JP2007223841A (en) | 2006-02-23 | 2006-02-23 | Method for producing artificial aggregate using waste slag as main raw material |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2007223841A true JP2007223841A (en) | 2007-09-06 |
Family
ID=38545993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2006046516A Pending JP2007223841A (en) | 2006-02-23 | 2006-02-23 | Method for producing artificial aggregate using waste slag as main raw material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2007223841A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100874887B1 (en) | 2007-12-27 | 2008-12-19 | 한국건설기술연구원 | Producing method carbonized lightweight aggregate using organic sludge |
KR100997136B1 (en) | 2010-04-26 | 2010-11-29 | 삼표이앤씨 주식회사 | Lightweight aggregate composite using industrial waste & lightweight aggregate manufacturing method |
CN109053145A (en) * | 2018-10-17 | 2018-12-21 | 沈阳航空航天大学 | A kind of sludge mixing lightweight aggregate and its preparation process |
CN109180151A (en) * | 2018-11-21 | 2019-01-11 | 苏州中材非金属矿工业设计研究院有限公司 | A method of ceramic raw material is prepared using graphite tailing |
CN111362668A (en) * | 2020-05-21 | 2020-07-03 | 江苏启坤循环经济产业技术开发有限公司 | Preparation method for producing stones by using industrial waste residues and sludge and application of stones in concrete |
-
2006
- 2006-02-23 JP JP2006046516A patent/JP2007223841A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100874887B1 (en) | 2007-12-27 | 2008-12-19 | 한국건설기술연구원 | Producing method carbonized lightweight aggregate using organic sludge |
KR100997136B1 (en) | 2010-04-26 | 2010-11-29 | 삼표이앤씨 주식회사 | Lightweight aggregate composite using industrial waste & lightweight aggregate manufacturing method |
CN109053145A (en) * | 2018-10-17 | 2018-12-21 | 沈阳航空航天大学 | A kind of sludge mixing lightweight aggregate and its preparation process |
CN109180151A (en) * | 2018-11-21 | 2019-01-11 | 苏州中材非金属矿工业设计研究院有限公司 | A method of ceramic raw material is prepared using graphite tailing |
CN111362668A (en) * | 2020-05-21 | 2020-07-03 | 江苏启坤循环经济产业技术开发有限公司 | Preparation method for producing stones by using industrial waste residues and sludge and application of stones in concrete |
CN111362668B (en) * | 2020-05-21 | 2022-08-23 | 寿光润城建材有限公司 | Preparation method for producing stones by using industrial waste residues and sludge and application of stones in concrete |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN108218272B (en) | Environment-friendly artificial aggregate (aggregate) derived from waste | |
KR101941328B1 (en) | Production method for cement composition | |
JP2008536781A5 (en) | ||
JP2008536781A (en) | Firing aggregate containing IBA and low-calcium silicon aluminum material and method for producing the aggregate | |
JP2008538347A (en) | Synthetic aggregates containing sewage sludge and other waste and methods for producing such aggregates | |
JP2008538347A5 (en) | ||
JP2008247728A (en) | Method for producing water-retentive block | |
JP2007223841A (en) | Method for producing artificial aggregate using waste slag as main raw material | |
JP2001163647A (en) | Producing method of artificial aggregate using waste incineration ash and artificial aggregate obtained by this method | |
KR100880587B1 (en) | Self leveling bottom mortar agent manufacturing method | |
JP5443010B2 (en) | Method for producing hydrothermal solidified body of paper sludge incineration ash | |
KR20150005019A (en) | Composition of artificial aggregate of geopolymer bind and making method using inorganic waste sludges | |
JP2010180094A (en) | Method for manufacturing water-retentive block | |
PL210921B1 (en) | The manner of obtaining of light aggregate of municipal and industrial wastes | |
KR101451501B1 (en) | Composition of artificial aggregate and making method using inorganic sludge particle | |
JPH1029841A (en) | Production of artificial aggregate | |
JP2001253740A (en) | Artificial aggregate and its production process | |
JP3165626U (en) | Foam glass spherical particles | |
JPH08301641A (en) | Production of artificial lightweight aggregate | |
JP3055899B1 (en) | Artificial aggregate and method for producing the same | |
JP2005313032A (en) | Manufacturing method for hydrothermally solidified material of paper sludge incineration ash | |
JP3552173B2 (en) | Manufacturing method of lightweight aggregate using sewage sludge incineration ash | |
JP4774089B2 (en) | Molten slag hardened material and method for producing a molten slag hardened body using the same | |
JP2008127249A (en) | Machinable ceramic using waste slag as essential raw material | |
JP2019151527A (en) | Method of manufacturing lightweight aggregate |