JP2008150481A - Solidification material - Google Patents

Solidification material Download PDF

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JP2008150481A
JP2008150481A JP2006339280A JP2006339280A JP2008150481A JP 2008150481 A JP2008150481 A JP 2008150481A JP 2006339280 A JP2006339280 A JP 2006339280A JP 2006339280 A JP2006339280 A JP 2006339280A JP 2008150481 A JP2008150481 A JP 2008150481A
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solidified
weight
cement
waste
gypsum
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Kenji Yamamoto
健次 山本
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DAIEI KOGYO CO Ltd
DAIEI KOGYO KK
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DAIEI KOGYO CO Ltd
DAIEI KOGYO KK
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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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
    • C04B2111/1075—Chromium-free or very low chromium-content materials
    • C04B2111/1081—Chromium VI, e.g. for avoiding chromium eczema
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solidification material capable of solidifying an object to be solidified such as soft ground to a sufficient strength at a low cost, and to suppress hexavalent chromium contained in the object to be solidified such as cement and soil of the solidification material from being eluted from the object to be solidified after solidification. <P>SOLUTION: The solidification material contains cement, a waste plaster and a roast ash of an industrial waste produced by performing roasting under an atmosphere of a low concentration of oxygen at a temperature of 1,000-1,100°C. The cement is made to 25-45 wt.%, the waste plaster is made to 10-50 wt.% and the roast ash is made to 10-50 wt.%. More preferably, the cement is made to 30-40 wt.%, the waste plaster is made to 15-40 wt.% and the roast ash is made to 20-45 wt.%. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、廃材を利用し、道路や盛土における軟弱地盤など固化対象物を固化処理して補強するために用いられる固化材に関し、より詳しくは、上記固化処理後の固化対象物から六価クロムが溶出することを抑制するようにした固化材に関するものである。   The present invention relates to a solidified material that is used to solidify and reinforce a solidified object such as soft ground on roads and embankments using waste material, and more specifically, hexavalent chromium from the solidified object after the solidification process. It is related with the solidification material which suppressed that it elutes.

土壌の固化材には、従来、下記特許文献１に示されるものがある。この公報のものによれば、上記固化材は、セメント、石膏、および焼却灰を含有している。そして、この固化材は、軟弱土やヘドロ状汚泥を、植物の植生に好ましい土壌に改良するよう用いられる。   Conventionally, there exist some which are shown by following patent document 1 in the solidification material of soil. According to the publication, the solidifying material contains cement, gypsum, and incinerated ash. And this solidification material is used so that a soft soil and sludge-like sludge may be improved to the soil preferable for a plant vegetation.

特開２００２−３６３５６０号公報JP 2002-363560 A

ところで、上記固化材を用いて道路や盛土における軟弱地盤を固化処理する場合、この固化処理後の地盤が大きな負荷に耐え得る十分な強度になるよう、この地盤を固化する必要がある。   By the way, when solidifying a soft ground on a road or embankment using the solidifying material, it is necessary to solidify the ground so that the ground after the solidifying treatment has sufficient strength to withstand a large load.

このため、上記固化材の含有物質のうち、水硬性（水和により硬化する性質）があるセメントや石膏の含有重量比を、より増加させることが考えられる。   For this reason, it is possible to further increase the content weight ratio of cement or gypsum having hydraulic properties (properties that harden by hydration) among the materials contained in the solidifying material.

しかし、上記セメントや石膏の含有重量比を単に増加させると、これらは高価なものであるため、その分、上記固化材が高価になるという問題点がある。   However, if the content ratio of the cement or gypsum is simply increased, these are expensive, and there is a problem that the solidifying material becomes expensive accordingly.

一方、上記セメントには、通常、重金属である六価クロムが含有されている。このため、上記のように、地盤の固化処理として、上記セメントを含有する固化材を用いたとすると、この固化処理後の土壌から六価クロムが徐々に溶出してくるおそれがある。そして、これは土壌自体や、その周辺の水質などを汚染させる原因となって、好ましくない。   On the other hand, the cement usually contains hexavalent chromium which is a heavy metal. For this reason, if the solidification material containing the cement is used as the solidification treatment of the ground as described above, hexavalent chromium may be gradually eluted from the soil after the solidification treatment. This is not preferable because it contaminates the soil itself and the water quality around it.

本発明は、上記のような事情に注目してなされたもので、本発明の目的は、軟弱地盤などの固化対象物を十分な強度に固化可能とする固化材を安価に提供し、かつ、この固化材のセメントや土壌などの固化対象物に含有されている六価クロムが、固化後の固化対象物から溶出することを抑制することである。   The present invention has been made paying attention to the above situation, and the object of the present invention is to provide a solidified material that can solidify a solidified object such as soft ground with sufficient strength at a low cost, and This is to suppress the hexavalent chromium contained in the solidification object such as cement and soil of the solidification material from being eluted from the solidification target after solidification.

請求項１の発明は、セメント、廃材石膏、および低い酸素濃度の雰囲気下で、かつ、１０００−１１００℃の温度により焙焼することにより生成された産業廃棄物の焙焼灰を含有するものである。   The invention of claim 1 contains cement, waste gypsum, and roasted ash of industrial waste produced by roasting at a temperature of 1000-1100 ° C. in a low oxygen concentration atmosphere. is there.

請求項２の発明は、請求項１の発明に加えて、上記セメントを２５−４５重量％、上記廃材石膏を１０−５０重量％、上記焙焼灰を１０−５０重量％としたものである。   In addition to the invention of claim 1, the invention of claim 2 is such that the cement is 25-45 wt%, the waste gypsum is 10-50 wt%, and the roasted ash is 10-50 wt%. .

請求項３の発明は、請求項１の発明に加えて、上記セメントを３０−４０重量％、上記廃材石膏を１５−４０重量％、上記焙焼灰を２０−４５重量％としたものである。   In addition to the invention of claim 1, the invention of claim 3 is such that the cement is 30-40% by weight, the waste gypsum is 15-40% by weight, and the roasted ash is 20-45% by weight. .

本発明による効果は、次の如くである。   The effects of the present invention are as follows.

請求項１の発明は、セメント、廃材石膏、および低い酸素濃度の雰囲気下で、かつ、１０００−１１００℃の温度により焙焼することにより生成された産業廃棄物の焙焼灰を含有している。   The invention of claim 1 contains cement, waste gypsum, and roasted ash of industrial waste produced by roasting at a temperature of 1000-1100 ° C. in a low oxygen concentration atmosphere. .

即ち、上記固化材は、石膏として廃材石膏を含有しており、つまり、別途に新たに製造される石膏を用いることに代えて、安価な廃材石膏が利用されている。また、石膏は水硬性があるため、上記廃材石膏の重量％を、多少、多くする一方、セメントの重量％を少なくしても、軟弱地盤などの固化対象物を十分な強度に固化させることができ、これを例えば道路などに用いることができる。   That is, the solidification material contains waste material gypsum as gypsum, that is, inexpensive waste material gypsum is used in place of newly produced gypsum. In addition, since gypsum is hydraulic, the weight percent of the above-mentioned waste gypsum is slightly increased, and even if the weight percent of cement is decreased, solidified objects such as soft ground can be solidified to a sufficient strength. This can be used for roads, for example.

また、上記産業廃棄物は、単なる焼却灰ではなく、焙焼灰である。この焙焼灰は、焙焼炉などで焙焼された後、冷却されて粉粒状物質とされたものであって、上記セメントおよび廃材石膏との混合が容易にでき、かつ、上記焼却灰とは異なり、水硬性を有している。このため、この焙焼灰を含有させることにより、セメントの重量％を少なくしても、固化対象物を十分な強度に固化させることができる。   Moreover, the industrial waste is not simply incinerated ash but roasted ash. This roasted ash is roasted in a roasting furnace or the like and then cooled to a powdery substance, which can be easily mixed with the cement and waste gypsum, and the incinerated ash and Is different and has hydraulic properties. For this reason, by including this roasted ash, the solidification target can be solidified to a sufficient strength even if the weight percent of cement is reduced.

よって、上記固化材によれば、いずれも水硬性を有するセメント、廃材石膏、および焙焼灰によって、固化対象物を十分な強度に固化できる。また、上記したようにセメントの重量％を少なくでき、また、廃材である石膏を利用したことにより、上記固化材を安価に提供できる。   Therefore, according to the said solidification material, all can solidify a solidification object with sufficient intensity | strength with cement, waste material gypsum, and roasted ash which have hydraulic property. Moreover, as mentioned above, the weight% of cement can be reduced, and the above-mentioned solidifying material can be provided at low cost by using gypsum which is a waste material.

また、上記したように焙焼灰は、低い酸素濃度の雰囲気下で、かつ、１０００−１１００℃の温度により焙焼することにより生成されたものである。   In addition, as described above, the roasted ash is generated by roasting at a temperature of 1000 to 1100 ° C. in an atmosphere having a low oxygen concentration.

このため、上記焙焼灰は還元剤としての機能を有する。よって、上記固化対象物の固化処理として上記固化材を用いると、この固化材のセメントに含有されている六価クロムは、上記焙焼灰に吸着されるなどして、上記固化材により固化された後の固化対象物内に固定される。この結果、上記固化された後の地盤など固化対象物から六価クロムが溶出する、ということは防止され、これは環境汚染防止上、極めて有益である。   For this reason, the roasted ash has a function as a reducing agent. Therefore, when the solidification material is used as the solidification treatment of the solidification object, hexavalent chromium contained in the cement of the solidification material is solidified by the solidification material by being adsorbed by the roasted ash. After that, it is fixed in the solidified object. As a result, it is prevented that hexavalent chromium is eluted from the solidified object such as the ground after the solidification, which is extremely useful for preventing environmental pollution.

しかも、上記した固化対象物からの六価クロムの溶出の防止は、産業廃棄物の焙焼灰を利用したことから、上記した六価クロムの溶出の防止は安価に達成される。   In addition, the prevention of elution of hexavalent chromium from the solidification target is achieved by using roasted ash of industrial waste, so that the prevention of elution of hexavalent chromium is achieved at low cost.

請求項２の発明は、上記セメントを２５−４５重量％、上記廃材石膏を１０−５０重量％、上記焙焼灰を１０−５０重量％としている。   In the invention of claim 2, the cement is 25-45% by weight, the waste gypsum is 10-50% by weight, and the roasted ash is 10-50% by weight.

つまり、セメントと廃材石膏とを互いにほぼ同重量％にすることにより、前記従来の技術に比べ廃材石膏の重量％を全体的に多くして、セメントの重量％を少なくし、安価な固化材の提供ができるようにしている。また、上記焙焼灰の重量％を少なく抑えることにより、上記セメントと廃材石膏との各重量％をそれぞれ多くさせ、固化対象物を十分な強度に固化できるようにしている。   That is, by making the cement and the waste material gypsum substantially the same weight%, the weight percentage of the waste material gypsum is increased as a whole compared with the conventional technology, the weight percentage of the cement is reduced, and an inexpensive solidifying material is obtained. It is possible to provide. Further, by suppressing the weight% of the roasted ash to be small, each weight% of the cement and the waste material gypsum is increased so that the solidified object can be solidified with sufficient strength.

ここで、上記セメントを、２５重量％未満とすれば、固化対象物の強度が不足しがちとなり、４５重量％を越えると、固化材が高価となる。また、上記廃材石膏を１０重量％未満にすると、この廃材石膏の利用率が低下して、この廃材石膏の残り分の処理作業が煩雑となり、５０重量％を越えると、固化対象物の強度が不足しがちとなる。また、上記焙焼灰を１０重量％未満にすると、この産業廃棄物の利用率が低下して、この産業廃棄物の残り分の処理作業が煩雑となり、５０重量％を越えると、固化対象物の強度が不足しがちとなる。   Here, if the cement is less than 25% by weight, the strength of the object to be solidified tends to be insufficient, and if it exceeds 45% by weight, the solidified material becomes expensive. Also, if the waste gypsum is less than 10% by weight, the utilization rate of the waste gypsum is reduced, and the processing of the remaining waste gypsum becomes complicated, and if it exceeds 50% by weight, the strength of the solidified object is increased. It tends to be short. Further, if the roasted ash is less than 10% by weight, the utilization rate of this industrial waste is reduced, and the processing work for the remainder of this industrial waste becomes complicated. Tends to be insufficient.

よって、上記固化材によれば、固化対象物を十分な強度に固化できると共に、上記固化材を安価に提供できる、という「効果」が生じる。   Therefore, according to the above-mentioned solidifying material, there is an “effect” that the solidified object can be solidified with sufficient strength and the solidified material can be provided at low cost.

請求項３の発明は、上記セメントを３０−４０重量％、上記廃材石膏を１５−４０重量％、上記焙焼灰を２０−４５重量％としている。   According to a third aspect of the present invention, the cement is 30-40% by weight, the waste gypsum is 15-40% by weight, and the roasted ash is 20-45% by weight.

これによれば、上記請求項２による「効果」がより確実とされる。つまり、この固化材によれば、固化対象物を更に十分な強度に固化できると共に、上記固化対象物を安価に提供できる。   According to this, the “effect” according to the second aspect is further ensured. That is, according to this solidifying material, the solidified object can be further solidified with sufficient strength, and the solidified object can be provided at low cost.

本発明の固化材に関し、軟弱地盤などの固化対象物を十分な強度に固化可能とする固化材を安価に提供し、かつ、この固化材のセメントに含有されている六価クロムが、固化後の固化対象物から溶出しないようにする、という目的を実現するため、本発明を実施するための最良の形態は、次の如くである。   Regarding the solidified material of the present invention, a solidified material that can solidify a solidified object such as soft ground with sufficient strength is provided at a low cost, and the hexavalent chromium contained in the cement of the solidified material is solidified. The best mode for carrying out the present invention is as follows in order to realize the object of preventing elution from the solidified object.

固化材は、ポルトランドセメントを２５−４５重量％、廃材石膏を１０−５０重量％、および産業廃棄物の焙焼灰を１０−５０重量％含有している。   The solidified material contains 25-45% by weight Portland cement, 10-50% by weight gypsum waste, and 10-50% by weight roasted ash of industrial waste.

上記廃材石膏は、主に建築物の廃材中における耐火ボードの石膏（ＣaＳＯ４・２Ｈ２Ｏ）粉である。この廃材石膏は、上記セメントよりも劣るが水硬性を有している。 The waste material gypsum is mainly refractory board gypsum (CaSO 4 .2H 2 O) powder in the waste material of buildings. This waste gypsum is inferior to the cement, but has hydraulic properties.

また、上記産業廃棄物は一般産業廃棄物といわれるもので、この産業廃棄物を焙焼炉を用いて空気における体積％で１０％未満という低い酸素濃度の還元雰囲気下で、かつ、１０００−１１００℃の温度により焙焼する。そして、これを冷却すれば、粉粒状の焙焼灰が生成される。この焙焼灰も、上記セメントよりも劣るが水硬性を有している。   The industrial waste is called general industrial waste. This industrial waste is used in a reducing atmosphere having a low oxygen concentration of less than 10% by volume in air using a roasting furnace, and 1000-1100. Roast at a temperature of ° C. And if this is cooled, granular roasted ash will be produced | generated. This roasted ash is also inferior to the cement, but has hydraulic properties.

ここで、上記産業廃棄物を焙焼する際、１０％以上に酸素濃度が高いと、その焙焼灰は還元剤として機能し難くなる。また、焙焼温度が１０００℃未満であると、その生成物の性質は、焼却灰のそれに近くなって十分な水硬性を得ることが困難となる。また、焙焼温度が１１００℃を越えると、その生成物はガラス状に溶融しがちとなって、この場合も還元剤として機能し難くなる。そこで、上記のように産業廃棄物を１０％未満という低い酸素濃度の雰囲気下で、かつ、１０００−１１００℃の温度により焙焼することにより、焙焼灰を得るようにしている。なお、上記酸素濃度は、７％未満であることが、より好ましい。   Here, when the industrial waste is roasted, if the oxygen concentration is 10% or more, the roasted ash hardly functions as a reducing agent. If the roasting temperature is less than 1000 ° C., the properties of the product are close to those of incinerated ash, making it difficult to obtain sufficient hydraulic properties. When the roasting temperature exceeds 1100 ° C., the product tends to be melted into a glass, and in this case, it is difficult to function as a reducing agent. Therefore, roasted ash is obtained by roasting industrial waste in an atmosphere having a low oxygen concentration of less than 10% and at a temperature of 1000 to 1100 ° C. as described above. The oxygen concentration is more preferably less than 7%.

上記焙焼灰は、ＳiＯが１８−１９重量％、ＣaＯが２８−３０重量％、Ａｌ２Ｏ３が７−１２重量％、Ｆe２Ｏ３が３−５重量％、Ｃｌが５−７重量％、Ｐ２Ｏ５が３−４重量％、ＳＯ３が７−１１重量％、その他、ＰbＯ，Ｃr２Ｏ３、Ｍ２Ｏ、Ｃdなどが含有されている。上記産業廃棄物には、一般に、六価クロムが含有されるが、上記した還元雰囲気下での焙焼により、上記六価クロムは、そのほとんどが化学的に安定した三価クロムになると考えられる。 The roasted ash is composed of 18-19% by weight of SiO, 28-30% by weight of CaO, 7-12% by weight of Al 2 O 3 , 3-5% by weight of Fe 2 O 3 and 5-7% by weight of Cl. %, P 2 O 5 is 3-4% by weight, SO 3 is 7-11% by weight, and PbO, Cr 2 O 3 , M 2 O, Cd and the like are contained. The industrial waste generally contains hexavalent chromium, but it is considered that most of the hexavalent chromium becomes chemically stable trivalent chromium by roasting in the reducing atmosphere described above. .

上記固化材を用いて固化させようとする固化対象物は、主に、道路、盛土、建築物の設置基盤などの軟弱地盤であり、固化後の地盤には、大きい外力が負荷されるため、この固化後の地盤には、十分に大きい強度が要求される。   The solidified object to be solidified using the above solidified material is mainly soft ground such as roads, banking, building installation bases, etc., because a large external force is applied to the ground after solidification, The solidified ground is required to have a sufficiently large strength.

産業上、上記廃材石膏と焙焼灰とが生じてくる割合は、一般に、上記固化材における廃材石膏１０−５０重量％と、焙焼灰の１０−５０重量％との比にほぼ合致している。つまり、産業界に生じてくる廃材石膏と焙焼灰とが、より残り少なく、上記固化材に用いられるよう企図されている。   Industrially, the ratio of the waste material gypsum and the roasted ash is generally almost equal to the ratio of the waste material gypsum 10-50% by weight and the roasted ash 10-50% by weight in the solidified material. Yes. That is, it is intended that the waste material gypsum and roasted ash generated in the industrial world are used in the solidified material with less remaining.

ここで、上記セメントを、２５重量％未満とすれば、固化対象物の強度が不足しがちとなり、４５重量％を越えると、固化材が高価となる。また、上記廃材石膏を１０重量％未満にすると、この廃材石膏の利用率が低下して、この廃材石膏の残り分の処理作業が煩雑となり、５０重量％を越えると、固化対象物の強度が不足しがちとなる。また、上記焙焼灰を１０重量％未満にすると、この産業廃棄物の利用率が低下して、この産業廃棄物の残り分の処理作業が煩雑となり、５０重量％を越えると、固化対象物の強度が不足しがちとなる。   Here, if the cement is less than 25% by weight, the strength of the object to be solidified tends to be insufficient, and if it exceeds 45% by weight, the solidified material becomes expensive. Also, if the waste gypsum is less than 10% by weight, the utilization rate of the waste gypsum is reduced, and the processing of the remaining waste gypsum becomes complicated, and if it exceeds 50% by weight, the strength of the solidified object is increased. It tends to be short. Further, if the roasted ash is less than 10% by weight, the utilization rate of this industrial waste is reduced, and the processing work for the remainder of this industrial waste becomes complicated. Tends to be insufficient.

なお、上記セメントを３０−４０重量％、上記廃材石膏を１５−４０重量％、上記焙焼灰を２０−４５重量％にすれば、特に、固化対象物の強度を向上させる上で、より好ましい。また、上記廃材石膏は、廃材のみで構成されていてもよいが、全てが廃材でなくてもよく、別途製造した石膏が含有されていてもよい。   In addition, it is more preferable to improve the strength of the solidified object, particularly when the cement is 30-40% by weight, the waste gypsum is 15-40% by weight, and the roasted ash is 20-45% by weight. . Moreover, although the said waste material gypsum may be comprised only with the waste material, not all may be a waste material and the gypsum manufactured separately may be contained.

また、上記セメントをポルトランドセメントとし、上記固化材が、アルミナ（Ａｌ２Ｏ３）を２−８重量％含有するようにしてもよい。なお、上記アルミナの含有量は４−６重量％であることが、より好ましい。 The cement may be Portland cement, and the solidified material may contain 2-8% by weight of alumina (Al 2 O 3 ). In addition, it is more preferable that content of the said alumina is 4-6 weight%.

本発明をより詳細に説明するために、その実施例１を添付の図１に従って説明する。   In order to explain the present invention in more detail, the first embodiment will be described with reference to FIG.

ここで、環告４６号（環境庁告示４６号による溶出試験）に従い、各種濃度の六価クロムの溶媒に上記焙焼灰を加えた場合の六価クロムの溶出量（安全性）を実験により求めた。   Here, according to notification 46 (dissolution test according to Environment Agency Notification 46), the amount of hexavalent chromium dissolved (safety) when the above-mentioned roasted ash was added to a solvent of hexavalent chromium of various concentrations was tested. Asked.

下記［表１］は、上記実験の実験結果である。   [Table 1] below shows the experimental results of the above experiment.

Figure 2008150481
上記焙焼灰は、還元雰囲気下で焙焼されたものであるため、この焙焼灰に六価クロムが吸着されたり、固定されたりして、この六価クロムの溶出が抑制される、と考えられる。そして、上記［表１］によれば、六価クロムの溶出量は極めて効果的に抑制されていることがわかる。
Figure 2008150481
 Since the roasted ash is roasted in a reducing atmosphere, hexavalent chromium is adsorbed or fixed to the roasted ash, and elution of the hexavalent chromium is suppressed. Conceivable. And according to said [Table 1], it turns out that the elution amount of hexavalent chromium is suppressed very effectively.

この実施例１では、固化材におけるポルトランドセメントを４０重量％、廃材石膏（ＣaＳＯ４・２Ｈ２Ｏ）を２０重量％、および産業廃棄物の上記焙焼灰を４０重量％とした。そして、砂質土による軟弱地盤の一部を構成する資料土に、上記固化材を添加して、試験機により、その強度（一軸圧縮強さ：ＫＮ／ｍ２）を測定した。なお、この強度は７日材齢として判定したものであり、以下同じとする。また、上記資料土の元の性状は、湿潤密度が１．８７８ｋｇ／ｃｍ２、含水比が１９−４０％である。 In Example 1, 40% by weight of Portland cement in the solidified material, 20% by weight of waste gypsum (CaSO 4 .2H 2 O), and 40% by weight of the roasted ash of industrial waste. And the said solidification material was added to the data soil which comprises a part of soft ground by sandy soil, and the intensity | strength (uniaxial compressive strength: KN / m < 2 >) was measured with the testing machine. In addition, this intensity | strength was determined as a 7-day age, and it is the same hereafter. In addition, the original properties of the material soil are a wet density of 1.878 kg / cm 2 and a moisture content of 19-40%.

図１は、上記資料土に対し、上記固化材を種々の添加量（固化材ｋｇ／資料土ｍ３）にて添加した場合に、資料土の強度がそれぞれどのように変化するかをグラフで示した実験結果である。この図１において、上記固化材の実験結果については○線で示してある。また、この固化材と他社製品の固化材とを比較するため、この他社製品についても上記固化材と同様に実験し、この実験結果を△線で示した。 FIG. 1 is a graph showing how the strength of the material soil changes when the solidification material is added to the material soil at various addition amounts (solidification material kg / material soil m 3 ). It is the experimental result shown. In FIG. 1, the experimental result of the solidified material is indicated by a circle. In addition, in order to compare this solidified material with the solidified material of another company's product, this other company's product was also experimented in the same manner as the above-mentioned solidified material, and the result of this experiment is indicated by a triangle.

図１において、上記固化材と他社製品とを比較すれば、添加量１５０ｋｇ／ｍ３付近では、上記固化材は、他社製品に比べ強度は若干劣るが、通常の使用範囲１００ｋｇ／ｍ３付近では、実験誤差程度の範囲内であり、上記固化材の固化性能は、上記他社製品と比べて遜色のないことがわかる。 In FIG. 1, if the above solidified material is compared with the other company's product, the solidified material is slightly inferior to the other company's product when the addition amount is around 150 kg / m 3 , but in the normal use range near 100 kg / m 3. It is within the range of the experimental error, and it can be seen that the solidification performance of the solidified material is comparable to the products of other companies.

上記環告４６号に従い、上記資料土についての六価クロムの溶出量（ｍｇ／ｌ）を実験により求めた。図２は、この実験の実験結果である。この図２において、上記固化材についての実験結果については○線で示している。また、この固化材と、他社製品の一般固化材、および他社製品の六価クロム溶出低減用固化材とを比較するため、これら他社製品についても上記固化材と同様に実験し、この実験結果を◆、■で示した。   According to the above notice 46, the elution amount (mg / l) of hexavalent chromium with respect to the material soil was determined by experiment. FIG. 2 shows the experimental results of this experiment. In FIG. 2, the experimental results for the solidified material are indicated by circles. In addition, in order to compare this solidified material with the general solidified material of other company's products and the solidified material for reducing hexavalent chromium elution of other company's products, we also experimented with these other companies' products in the same way as the above solidified material, Indicated by ◆ and ■.

図２において、上記固化材と各他社製品とを比較すれば、上記固化材についての溶出量は、溶出低減用固化材のそれと同様に土壌汚染の環境基準（０．０５ｍｇ／ｌ）を下回っていることがわかる。つまり、上記焙焼灰を用いることにより、土壌は効率的に無害化される。   In FIG. 2, if the above solidified material is compared with the products of other companies, the amount of elution from the above solidified material is below the environmental standard for soil contamination (0.05 mg / l), similar to that of the solidified material for elution reduction. I understand that. That is, by using the roasted ash, the soil is made harmless efficiently.

本発明をより詳細に説明するために、その実施例２を添付の図３に従って説明する。   In order to describe the present invention in more detail, the second embodiment will be described with reference to FIG.

この実施例２では、粘性土による軟弱地盤の一部を構成する資料土に、上記固化材を添加して、強度を測定するよう実験した。上記資料土の元の性状は、湿潤密度が１．７５３ｋｇ／ｃｍ２、含水比が２３−５３％である。 In this Example 2, an experiment was conducted to measure the strength by adding the above-mentioned solidifying material to the material soil that constitutes a part of the soft ground by the viscous soil. The original properties of the material soil have a wet density of 1.753 kg / cm 2 and a moisture content of 23-53%.

他の実験条件は、前記実施例１のものと同様であり、図３はその実験結果である。この図３において、上記固化材の実験結果については○線で示してある。また、この固化材と他社製品の固化材とを比較するために、この他社製品についても、上記固化材と同様に実験し、この実験結果を△線で示した。   Other experimental conditions are the same as those in Example 1, and FIG. 3 shows the experimental results. In FIG. 3, the experimental result of the solidified material is indicated by a circle. In addition, in order to compare this solidified material with the solidified material of another company's product, this other company's product was also tested in the same manner as the above-mentioned solidified material, and the result of this experiment is indicated by a triangle.

図３において、上記固化材と他社製品とを比較すれば、添加量１５０ｋｇ／ｍ３付近では、上記固化材は、他社製品に比べ強度は若干劣るが、通常の使用範囲１００ｋｇ／ｍ３付近では、実験誤差程度の範囲内であり、上記固化材の固化性能は、上記他社製品と比べて遜色のないことがわかる。 In FIG. 3, if the above solidified material is compared with the product of another company, the strength of the above solidified material is slightly inferior to that of the other company when the addition amount is around 150 kg / m 3 , but in the normal use range near 100 kg / m 3. It is within the range of the experimental error, and it can be seen that the solidification performance of the solidified material is comparable to the products of other companies.

実施例１を示し、砂質土を資料とした強度の実験結果である。It is Example 1 and shows the experimental results of strength using sandy soil as a data. 実施例１を示し、資料土の強度と六価クロムの溶出量との関係を示す図である。FIG. 5 is a diagram showing Example 1 and showing the relationship between the strength of the material soil and the elution amount of hexavalent chromium. 実施例２を示し、粘性土を資料とした強度の実験結果である。It is Example 2 and shows the experimental result of strength using viscous soil as a data.

Claims (3)

セメント、廃材石膏、および低い酸素濃度の雰囲気下で、かつ、１０００−１１００℃の温度により焙焼することにより生成された産業廃棄物の焙焼灰を含有することを特徴とする固化材。   Cement, waste material gypsum, and solidified material characterized by containing industrial waste roasted ash produced by roasting at a temperature of 1000-1100 ° C. in an atmosphere of low oxygen concentration. 上記セメントを２５−４５重量％、上記廃材石膏を１０−５０重量％、上記焙焼灰を１０−５０重量％としたことを特徴とする請求項１に記載の固化材。   The solidified material according to claim 1, wherein the cement is 25 to 45% by weight, the waste material gypsum is 10 to 50% by weight, and the roasted ash is 10 to 50% by weight. 上記セメントを３０−４０重量％、上記廃材石膏を１５−４０重量％、上記焙焼灰を２０−４５重量％としたことを特徴とする請求項１に記載の固化材。   The solidified material according to claim 1, wherein the cement is 30-40% by weight, the waste material gypsum is 15-40% by weight, and the roasted ash is 20-45% by weight.
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JP2021151947A (en) * 2020-03-18 2021-09-30 昌敏 遠藤 Method for producing inorganic industrial waste recycled product

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JPS61218684A (en) * 1985-03-25 1986-09-29 Jiyouban Kogyo Kk Ground-reinforcing material utilizing factory wastes
JPH07157761A (en) * 1993-12-08 1995-06-20 Chichibu Onoda Cement Corp Soil stabilization treating material and method for soil stabilization treatment
JP2002241166A (en) * 2000-12-11 2002-08-28 Taiheiyo Cement Corp Hydraulic composition
JP2004067399A (en) * 2002-08-01 2004-03-04 Kochi Recycle Center:Kk Method of producing regenerated sand from construction sludge

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JPS61218684A (en) * 1985-03-25 1986-09-29 Jiyouban Kogyo Kk Ground-reinforcing material utilizing factory wastes
JPH07157761A (en) * 1993-12-08 1995-06-20 Chichibu Onoda Cement Corp Soil stabilization treating material and method for soil stabilization treatment
JP2002241166A (en) * 2000-12-11 2002-08-28 Taiheiyo Cement Corp Hydraulic composition
JP2004067399A (en) * 2002-08-01 2004-03-04 Kochi Recycle Center:Kk Method of producing regenerated sand from construction sludge

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021151947A (en) * 2020-03-18 2021-09-30 昌敏 遠藤 Method for producing inorganic industrial waste recycled product
JP7306658B2 (en) 2020-03-18 2023-07-11 昌敏 遠藤 Manufacturing method for recycled inorganic industrial waste

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