JP3769569B2 - Asbestos detoxification treatment method - Google Patents
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Description
本発明は、フロン分解無害化処理によって生成されたフロン分解物を利用したアスベスト無害化処理方法に関する。 The present invention relates to an asbestos detoxification treatment method using a fluorocarbon degradation product generated by the detoxification treatment of freon.
アスベスト（石綿）は、天然の鉱物繊維で、種類としては蛇紋岩系のクリソタイル（白石綿、Mg6Si4O10(OH)8）や角閃石系のアモサイト（茶石綿、(Fe,Mg)7Si8O22(OH)2）などがある。アスベストは、耐熱性、耐薬品性、絶縁性などの諸特性に優れているため、建設資材、電気製品、自動車および家庭用品などの分野で幅広く利用されている。我が国で１９３０年から２００２年の間に消費されたアスベストは１０００万トンにも及び、その９割以上は建築資材（スレート板，屋根瓦，耐火被覆材等）として使用されたと言われている。 Asbestos (natural asbestos) is a natural mineral fiber, the types of which are serpentine chrysotile (white asbestos, Mg 6 Si 4 O 10 (OH) 8 ) and amphibolite amosite (tea asbestos, (Fe, Mg)) 7 Si 8 O 22 (OH) 2 ). Asbestos is excellent in various properties such as heat resistance, chemical resistance, and insulation, and is widely used in fields such as construction materials, electrical products, automobiles and household products. In Japan, asbestos consumed between 1930 and 2002 reached 10 million tons, more than 90% of which was said to have been used as building materials (slate boards, roof tiles, fireproof coverings, etc.).
上記したように、アスベストは優れた特性を有するものの、疾病との因果関係が指摘されている。すなわち、アスベストは、太さが人間の髪の毛の１／５０００という非常に微細なガラス状繊維であり、アスベストの粉塵を人が吸い込むと、いわゆる「ミクロの針」が肺細胞に刺さる。このような事態が続くことにより、石綿肺、肺癌、悪性中皮腫などの重大な疾病が引き起こされる。 As described above, although asbestos has excellent characteristics, a causal relationship with disease has been pointed out. That is, asbestos is a very fine glassy fiber with a thickness of 1/5000 that of human hair, and when a person inhales asbestos dust, so-called “micro needles” pierce lung cells. Such a situation continues to cause serious illnesses such as asbestosis, lung cancer, and malignant mesothelioma.
因みに、ＷＨＯ（世界保健機関）では、アスベストを発ガン物質と断定し、例えばアメリカではＥＰＡ（環境保護局）が建築資材のアスベストの全面禁止を打ち出し、ドイツでは１９９４年からアスベストの輸入・生産・使用を全面禁止するにいたっている。我が国でも大気汚染防止法でアスベスト粉塵を特定粉塵と定め発生施設に規制を課しているが、その輸入量はアメリカの約８倍で世界一アスベストを使用する国といわれている。 By the way, the WHO (World Health Organization) has determined that asbestos is a carcinogen. For example, in the United States, the EPA (Environmental Protection Agency) has banned asbestos as a building material. It leads to a total ban on use. In Japan, asbestos dust is specified as specified dust under the Air Pollution Control Law and regulations are imposed on the facility where it is generated. The amount of imports is about eight times that of the United States, and it is said to be the country that uses the best asbestos in the world.
日本における輸入アスベストの約９割は建築資材に使用されているが、含アスベスト建材が用いられている建造物の解体は今後ピークを迎えることから、アスベスト暴露とアスベスト処理の問題が深刻化することは避けられないものと思われる。 About 90% of imported asbestos in Japan is used for building materials, but the demolition of buildings that use asbestos-containing building materials will peak in the future, and asbestos exposure and asbestos disposal problems will become serious. Seems inevitable.
現在、アスベストおよびアスベスト含有物質は産業廃棄物として最終処分場に埋め立てられているが、これにも限度がある。そのため、従来より種々のアスベストの分解無害化処理技術が提案されている。その代表的なものとしては、密閉型電気炉溶解法とスラグ浴融解法とが挙げられる（例えば、特許文献１，特許文献２参照）。
Currently, asbestos and asbestos-containing materials are landfilled as industrial waste in final disposal sites, but this also has limitations. For this reason, various asbestos decomposition and detoxification treatment techniques have been proposed. Typical examples thereof include a closed electric furnace melting method and a slag bath melting method (see, for example,
ここで、特許文献１には、密閉型電気炉によりシュートを介して袋中に収容されたアスベストを高温（１５００℃）で溶解する無害化処理方法が開示されている。また、特許文献２には、ＳｉＯ２よりもＣａＯの含有量が多い水処理汚泥を塩基度調整剤兼バインダーとしてアスベストに混合して成形した混合物を、炭素系可燃物質を燃料とする高温炉床に供給して高温加熱溶融する無害化処理方法が開示されている。この特許文献２中には、アスベストを１０８０〜１１４０℃で溶融してスラグを生成することが記載されている。
ところで、上記したアスベストの無害化処理方法は、いずれも１０００℃以上の処理温度を要し、膨大なエネルギー消費問題を抱えていることから実用化には至っていないのが現状である。 By the way, the above-mentioned asbestos detoxification methods all require a treatment temperature of 1000 ° C. or more and have a huge energy consumption problem, so that they have not been put into practical use.
本発明の目的は、低エネルギでアスベストを確実に無害化できるアスベスト無害化処理方法を提供することにある。 An object of the present invention is to provide an asbestos detoxification method that can reliably detoxify asbestos with low energy.
本発明者は、環境汚染の原因となる有害物質の無害化に鋭意努力している。本発明者は、平成１０年７月に群馬県自動車販売店協会から委託を受け、廃棄自動車のカーエアコンに入っているフロンを回収し、分解無害化処理を行っている。このフロン無害化処理技術は一定の成果を上げており、今回はアスベストの無害化処理に取り組むこととした。 The inventor has made intensive efforts to detoxify harmful substances that cause environmental pollution. The present inventor was commissioned by the Gunma Prefectural Automobile Dealers Association in July 1998 to collect the chlorofluorocarbon contained in the car air conditioner of a discarded car and perform a detoxification process. This fluorocarbon detoxification technology has achieved certain results, and this time we decided to work on detoxification of asbestos.
ここに、本発明者は、アスベストを低エネルギで無害化するには、できる限り低温でアスベストを融解させる融解剤を見つけ出すことが必要であるとの考えのもとに研究を進めてきたが、上記したフロン無害化処理によって生成される物質（フロン分解物）がフッ化カルシウムを含むことに着目し、このフロン分解物を融解剤として各種実験を行った結果、本発明を創成したものである。 Here, the present inventor has carried out research based on the idea that it is necessary to find a melting agent that melts asbestos at as low a temperature as possible to make asbestos harmless with low energy. The present invention was created as a result of various experiments using the fluorocarbon degradation product as a melting agent, focusing on the fact that the substance (fluorocarbon degradation product) produced by the above-mentioned fluorocarbon detoxification treatment contains calcium fluoride. .
すなわち、本発明は、アスベストとフロン分解無害化処理によって生成されたフロン分解物とを混合し、次いで当該混合物を６００℃以下（例えば、５７５℃）の低温で所定時間（例えば、２時間）加熱処理して成る。ここで、アスベストとしては、現在日本で使用が認められているクリソタイルはもとより、クロシドライト、アモサイト、アンソフィライト、トレモライト、アクチノライト等を無害化できる。また、フロン分解物は、粉末状、半ナマ状、スラリー状のいずれの形態のものも使用できる。また、本発明は、アスベストを含んだ物質（アスベストを含んだスレート板、屋根瓦、水道管、自動車のブレーキ、アセチレンボンベの充填材、耐火被覆材等）の無害化にも適用できる。また、アスベスト含有物質が多孔質の場合には、スラリー状のフロン分解物を含浸させた後に低温加熱処理しても無害化でき、アスベスト含有物質を破壊又は粉砕する手間が省ける。 That is, according to the present invention, asbestos and a chlorofluorocarbon decomposition product produced by detoxification treatment of chlorofluorocarbon are mixed, and then the mixture is heated at a low temperature of 600 ° C. or lower (for example, 575 ° C.) for a predetermined time (for example, two hours). Processed. Here, asbestos, crocidolite, amosite, anthophyllite, tremolite, actinolite, etc. can be rendered harmless, as well as chrysotile, which is currently approved for use in Japan. In addition, the chlorofluorocarbon decomposition product can be used in any form of powder, semi-feed, and slurry. The present invention can also be applied to detoxify substances containing asbestos (slate plates containing asbestos, roof tiles, water pipes, automobile brakes, acetylene cylinder fillers, fireproof coatings, etc.). In addition, when the asbestos-containing substance is porous, it can be rendered harmless even by low-temperature heat treatment after impregnating the slurry-like fluorocarbon decomposition product, and the time and labor for breaking or crushing the asbestos-containing substance can be saved.
本発明によれば、低エネルギ（加熱温度６００℃以下）でアスベストを確実に分解することができる。すなわち、アスベストの繊維形態の消滅、結晶構造の崩壊などを引き起こして無害化できる。これにより、フロン分解物の有効利用を図りつつアスベストを無害化処理することができ、環境汚染防止に多いに役立つ。 According to the present invention, asbestos can be reliably decomposed with low energy (heating temperature of 600 ° C. or less). That is, it can be rendered harmless by causing the disappearance of the fiber form of asbestos, the collapse of the crystal structure, and the like. As a result, asbestos can be detoxified while effectively utilizing the CFC decomposition product, which is useful for preventing environmental pollution.
以下、本発明の実施形態を図面等を用いて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
本発明に係るアスベストの無害化処理方法は、アスベスト（又はアスベスト含有物質）とフロン分解無害化処理によって生成されたフロン分解物とを混合（混練）し、次いで当該混合物を６００℃以下の低温で所定時間（例えば２時間）加熱処理して成る。 The asbestos detoxification treatment method according to the present invention comprises mixing (kneading) asbestos (or an asbestos-containing substance) and a fluorocarbon decomposition product produced by detoxification treatment with fluorocarbons, and then mixing the mixture at a low temperature of 600 ° C. or lower. Heat treatment is performed for a predetermined time (for example, 2 hours).
アスベストは、クリソタイル、クロシドライト、アモサイト、アンソフィライト、トレモライト、アクチノライト等と種々あるが、上記無害化処理方法はいずれの種類でも適用可能である。また、フロン分解物とは、フロンの分解無害化処理によって生成された物質（フッ化カルシウムと炭酸カルシウムの混合物）であり、粉末状、半ナマ状、スラリー状のいずれの形態のものも使用できる。なお、粉末状のフロン分解物は、保管や運搬が一段と便利である。また、スラリー状および半ナマ状のフロン分解物は、アスベストとの混合（混練）を一段と容易に行えるとともに、乾燥する必要がないのでエネルギ消費量が一段と少なくなる。 There are various types of asbestos such as chrysotile, crocidolite, amosite, anthophyllite, tremolite, actinolite, etc., but any of the above detoxification methods can be applied. The chlorofluorocarbon decomposition product is a substance (mixture of calcium fluoride and calcium carbonate) generated by the detoxification treatment of chlorofluorocarbon and can be used in any form of powder, semi-feed, and slurry. . In addition, storage and transportation of powdered CFC decomposition products are more convenient. In addition, the slurry-like and semi-lived CFC-decomposed products can be more easily mixed (kneaded) with asbestos, and the energy consumption is further reduced because there is no need for drying.
アスベストに対するフロン分解物の混合割合が増えるほどアスベストの分解は容易になるが、下記の実施例１ではフロン分解物：アスベストを７：３（質量比）とした。 Asbestos decomposition becomes easier as the mixing ratio of the CFC decomposition product to asbestos increases, but in Example 1 below, CFC decomposition product: asbestos was set to 7: 3 (mass ratio).
本無害化処理方法の効果を確認するため、フロン分解物を用いない分解実験（以下、実験Ａと称する）とフロン分解物を用いた分解実験（以下、実験Ｂと称する）とを行った。 In order to confirm the effect of this detoxification treatment method, a decomposition experiment using no CFC decomposition product (hereinafter referred to as Experiment A) and a decomposition experiment using CFC decomposition product (hereinafter referred to as Experiment B) were performed.
アスベストとしては、関東化学株式会社製造のクリソタイルを使用した。また、フロン分解物としては、アークプラズマ方式（特開平１０−２４９１６１号等）のフロン分解無害化装置を用いて生成されたものを使用した。 As asbestos, Chrysotile manufactured by Kanto Chemical Co., Ltd. was used. Further, as the chlorodecomposed product, a chlorofluorocarbon-decomposed product produced by using an arc plasma type (JP-A-10-249161, etc.) chlorofluorocarbon decomposition detoxification device was used.
なお、上記フロン分解無害化装置は、放電によって空気をプラズマ化して超高温（約１０，０００℃）のアークを発生させ、そこにフロン〔例えば、フロン１２（ＣＣｌ２Ｆ２）〕と水蒸気（Ｈ２Ｏ）とを送り込んで瞬時に分解処理する。 The chlorofluorocarbon decomposition and detoxification device converts air into plasma by electric discharge to generate an arc of extremely high temperature (about 10,000 ° C.), and chlorofluorocarbon (for example, chlorofluorocarbon 12 (CCl 2 F 2 )) and water vapor (for example, H 2 O) and is instantaneously decomposed.
ＣＣｌ２Ｆ２＋２Ｈ２Ｏ → ２ＨＣｌ ＋ ２ＨＦ ＋ ＣＯ２ CCl 2 F 2 + 2H 2 O → 2HCl + 2HF + CO 2
分解ガスは、消石灰〔Ｃａ（ＯＨ）２〕で急冷されながら中和して、下記反応式で示すように、塩化カルシウムＣａＣｌ２とフッ化カルシウム（ＣａＦ２）と炭酸カルシウム（ＣａＣＯ３）とからなる無害化物質（フロン分解物）となる。塩化カルシウムは、場合によっては水洗処理を数回行って取り除くことがある。なお、この実施例では、水洗処理にかかるエネルギと時間と労力とを省くために、塩化カルシウムは除去しなかった。 The cracked gas is neutralized while being quenched with slaked lime [Ca (OH) 2 ] and, as shown in the following reaction formula, from calcium chloride CaCl 2 , calcium fluoride (CaF 2 ), and calcium carbonate (CaCO 3 ). It becomes a detoxifying substance (CFC decomposition product). In some cases, calcium chloride may be removed by washing with water several times. In this example, calcium chloride was not removed in order to save energy, time, and labor required for the washing process.
２ＨＣｌ ＋ Ｃａ（ＯＨ）2 → ＣａＣｌ2＋２Ｈ２Ｏ
２ＨＦ ＋ Ｃａ（ＯＨ）2 → ＣａＦ2＋２Ｈ２Ｏ
ＣＯ2 ＋ Ｃａ（ＯＨ）2 → ＣａＣＯ3＋Ｈ２Ｏ
2HCl + Ca (OH) 2 → CaCl 2 + 2H 2 O
2HF + Ca (OH) 2 → CaF 2 + 2H 2 O
CO 2 + Ca (OH) 2 → CaCO 3 + H 2 O
なお、プラズマアーク方式以外のフロン分解無害化装置（高周波プラズマ方式、化学的熱分解方式、触媒方式、液中分解方式等）でも、上記したのと同様なフロン分解物が生成される。 In addition, chlorofluorocarbon decomposition products similar to those described above are also produced by chlorofluorocarbon detoxification devices other than the plasma arc method (high-frequency plasma method, chemical thermal decomposition method, catalyst method, submerged decomposition method, etc.).
〔実験Ａ〕 上記アスベスト約５．０ｇをルツボに入れ、所定温度（３００，４００，５００，６００，７００，８００，９００，１０００℃）に保持された電気炉内で２時間加熱した後、目視と光学顕微鏡、ＳＥＭおよびＸ線回折による試料の評価を行った。 [Experiment A] Approximately 5.0 g of the asbestos was placed in a crucible, heated in an electric furnace maintained at a predetermined temperature (300, 400, 500, 600, 700, 800, 900, 1000 ° C.) for 2 hours, and then visually observed. And samples were evaluated by optical microscope, SEM and X-ray diffraction.
〔実験Ｂ〕 上記フロン分解物（脱水ケーキ，CaCO3・CaF2混合物）約1１．７ｇとアスベスト約５．０ｇとを混合し、７：３（質量比）の試料を調製した。この試料をルツボに入れ、所定温度（３００，４００，５００，６００，７００，８００，９００，１０００℃）に保持された電気炉内で２時間加熱した後、目視と光学顕微鏡、ＳＥＭおよびＸ線回折による試料の評価を行った。 [Experiment B] About 11.7 g of the above-mentioned CFC decomposition product (dehydrated cake, CaCO 3 · CaF 2 mixture) and about 5.0 g of asbestos were mixed to prepare a sample of 7: 3 (mass ratio). This sample was put in a crucible and heated in an electric furnace maintained at a predetermined temperature (300, 400, 500, 600, 700, 800, 900, 1000 ° C.) for 2 hours, and then visually, optical microscope, SEM and X-ray The sample was evaluated by diffraction.
〔実験Ａ，Ｂの結果〕 [Results of Experiments A and B]
（１）分解物の観察
加熱前のアスベストは明るい灰色であった。実験Ａで得られた試料は、加熱温度５００℃から淡褐色に変化し、加熱温度が上昇するにつれてその色味が増していた。また、加熱温度の上昇と共にアスベストの繊維組織が脆弱になった。実験Ｂで得られた試料にも実験Ａの試料と同じ傾向が見られた。なお、アスベストのみを１０００℃に加熱すると、繊維としての形態は肉眼的にも顕微鏡の視野でも見られない。パサパサの小さな粒の集合体にしか見えなかった。一方、アスベストをフロン分解物と混合した場合には、物質の一割が溶けガラス状になる。塊となっているから捨てるのも簡単である。
(1) Observation of decomposition product Asbestos before heating was light gray. The sample obtained in Experiment A changed from a heating temperature of 500 ° C. to a light brown color, and the color increased as the heating temperature increased. In addition, the asbestos fiber structure became brittle as the heating temperature increased. The same tendency as the sample of Experiment A was observed in the sample obtained in Experiment B. In addition, when only asbestos is heated at 1000 degreeC, the form as a fiber is not seen with the visual field of a microscope or a microscope. It seemed only as an aggregate of small grains of papasa. On the other hand, when asbestos is mixed with chlorofluorocarbon decomposition products, 10% of the substance melts and becomes glassy. It is easy to throw away because it is a lump.
（２）光学顕微鏡による試料の観察
実験Ａ，Ｂで得られた試料を光学顕微鏡（×１００）で観察したところ、加熱温度５００℃以上の試料で繊維質物質の減少が見られた。しかし、実験Ａでは加熱温度１０００℃の試料においても繊維質は分解されずに残っていたのに対し、実験Ｂでは加熱温度７００℃の試料で繊維質は全く確認されなかった。これらの結果より、フロン分解物にはアスベストの分解を促進させる作用があることが判明した。
(2) Observation of sample with optical microscope When the samples obtained in Experiments A and B were observed with an optical microscope (× 100), a decrease in fibrous material was observed in samples with a heating temperature of 500 ° C. or higher. However, in Experiment A, the fiber remained in the sample at a heating temperature of 1000 ° C. without being decomposed, whereas in Experiment B, no fiber was confirmed in the sample at a heating temperature of 700 ° C. From these results, it was found that the CFC decomposition product has an action of promoting the decomposition of asbestos.
（３）走査型電子顕微鏡による試料の観察
実験Ｂで得られた加熱温度５００℃の試料のＳＥＭ写真を図２に、加熱温度６００℃の試料を図３に示した。図３から繊維質の存在が確認されたものの、その絶対量は減少し繊維が短く、太くなっていることが図２との比較により分かった。繊維長と生体影響の関連性は多くの論文で述べられており、長くて細い繊維ほど生体に対して毒性があると言われている。
(3) Observation of the sample with a scanning electron microscope The SEM photograph of the sample with the heating temperature of 500 ° C. obtained in Experiment B is shown in FIG. 2, and the sample with the heating temperature of 600 ° C. is shown in FIG. Although the presence of the fiber was confirmed from FIG. 3, it was found by comparison with FIG. 2 that the absolute amount was decreased and the fiber was short and thick. The relationship between fiber length and biological effects has been described in many papers, and longer and thinner fibers are said to be more toxic to the body.
（４）Ｘ線回折測定
実験Ａで得られた加熱温度６００℃の試料のＸ線回折測定結果では、アスベストのピークが観測された。実験Ｂで得られた加熱温度５００℃の試料のＸ線回折測定結果を図４に示す。
(4) X-ray diffraction measurement As a result of X-ray diffraction measurement of the sample having a heating temperature of 600 ° C. obtained in Experiment A, an asbestos peak was observed. FIG. 4 shows the result of X-ray diffraction measurement of the sample having a heating temperature of 500 ° C. obtained in Experiment B.
2θが約５°の位置に見られるピークはアスベストの特徴的なピークである。そのピークの強度［cps］は、加熱温度の上昇と共に低下し、５７５℃ではピークが略消滅し、６００℃以上ではピークが完全に消滅した（なお、図５は５７５℃の場合、図６は６００℃の場合を示す）。これらの事実は、加熱温度６００℃でアスベストが完全に分解されていることを示唆している。その後の解析で、フロン分解物との共存下では加熱温度５７５℃でアスベストのピークが完全に消滅することが判明した。 The peak seen at a position where 2θ is about 5 ° is a characteristic peak of asbestos. The intensity [cps] of the peak decreases with increasing heating temperature, the peak is almost disappeared at 575 ° C., and the peak is completely disappeared at 600 ° C. or higher (FIG. 5 shows the case of 575 ° C., FIG. (The case of 600 ° C. is shown). These facts suggest that asbestos is completely decomposed at a heating temperature of 600 ° C. Subsequent analysis revealed that the asbestos peak disappeared completely at a heating temperature of 575 ° C. in the presence of a CFC decomposition product.
（５）結論
これまでに行った種々の試料評価を表１にまとめた。表の各セルの左側がＸ線回折測定結果による評価であり、右側が光学顕微鏡での観察による評価である。この表からフロン分解物の存在は非存在下に比べ１５０℃程低温（５７５℃）でのアスベスト無害化を可能にすることが見て取れる。
本発明は、アスベストを含有する物質の無害化にも適用可能である。すなわち、破壊又は粉砕されたアスベスト含有物質とフロン分解無害化処理によって生成されたフロン分解物とを混合し、次いで当該混合物を６００℃以下の低温で所定時間（例えば、２時間）加熱処理することによりアスベストを分解して無害化できる。 The present invention can also be applied to detoxify substances containing asbestos. That is, the asbestos-containing substance destroyed or pulverized and the chlorofluorocarbon decomposition product produced by the chlorofluorocarbon decomposition detoxification treatment are mixed, and then the mixture is heated at a low temperature of 600 ° C. or lower for a predetermined time (for example, 2 hours). Can be detoxified by decomposing asbestos.
ここで、アスベスト含有物質としては、アスベストを含んだスレート板、屋根瓦、水道管、自動車のブレーキ、アセチレンボンベのマトリックス、耐火被覆材等が挙げられる。例えば、屋根瓦を破壊又は粉砕した後、フロン分解物と混合（又は混練）し、次いで６００℃以下（例えば５７５℃程度）の低温で所定時間（例えば２時間）加熱処理すれば、アスベストは分解される。すなわち、繊維形態の消滅、結晶構造の崩壊などを引き起こし、アスベスト含有物質を無害化できる。 Here, examples of the asbestos-containing substance include slate plates containing asbestos, roof tiles, water pipes, automobile brakes, acetylene cylinder matrices, fireproof coating materials, and the like. For example, after assembling or crushing roof tiles, mixing (or kneading) with chlorofluorocarbon decomposition products, and then heat-treating at a low temperature of 600 ° C. or lower (for example, about 575 ° C.) for a predetermined time (for example, 2 hours), asbestos is decomposed. Is done. That is, the asbestos-containing substance can be rendered harmless by causing the disappearance of the fiber form, the collapse of the crystal structure, and the like.
特に、アスベスト含有物質が多孔質の場合には、スラリー状のフロン分解物を含浸させた後に６００℃以下（例えば５７５℃程度）の低温で所定時間（例えば２時間）加熱処理すれば、アスベストは分解されて無害化される。この方法によれば、アスベスト含有物質を破壊又は粉砕する手間が省ける。また、破壊・粉砕し難い多孔質アスベスト含有物質の無害化も容易に行える。 In particular, when the asbestos-containing substance is porous, asbestos can be obtained by impregnating a slurry-like fluorocarbon decomposition product and then heat-treating at a low temperature of 600 ° C. or less (eg, about 575 ° C.) for a predetermined time (eg, 2 hours). Decomposed and detoxified. According to this method, the trouble of destroying or pulverizing the asbestos-containing substance can be saved. In addition, it is possible to easily detoxify porous asbestos-containing materials that are difficult to break and pulverize.
例えば、アセチレンガスボンベの中身はケイ酸カルシウムの多孔質体（内部に多数の空隙のある物質）であるが、この多孔体には強度を保持するためにアスベストが含有されている。かかる多孔質体にアセトンがしみ込ませてあり、そのアセトンにアセチレンを溶解させる構造となっている。現在、使用済みアセチレンボンベは、アスベストの無害化処理法が確立されていないために産業廃棄物となっている。しかし、本発明を適用してアセチレンガスボンベのマトリックス多孔質体にスラリー状フロン分解物を充填し上記低温加熱処理することで、アスベストの無害化が可能となり、マトリックスのケイ酸カルシウムも資源として再利用が可能となる。同様に、スレートにスラリー状のフロン分解物をしみ込ませ、上記低温加熱処理することで、堅いスレートを破壊する手間が省け一段と簡単に無害化処理できる。 For example, the content of the acetylene gas cylinder is a porous body of calcium silicate (a substance having a large number of voids inside), and this porous body contains asbestos in order to maintain strength. Acetone is impregnated in the porous body, and acetylene is dissolved in the acetone. Currently, used acetylene cylinders are industrial waste because no detoxification treatment method for asbestos has been established. However, by applying the present invention, the matrix porous body of acetylene gas cylinder is filled with the slurry-like fluorocarbon decomposition product and subjected to the above-mentioned low-temperature heat treatment, so that asbestos can be rendered harmless, and the matrix calcium silicate is also reused as a resource Is possible. Similarly, by impregnating the slate with a slurry-like CFC decomposition product and subjecting it to the low temperature heat treatment, it is possible to make the detoxification treatment easier and more easy without the trouble of destroying the hard slate.
なお、上記実施例１では、クリソタイル型のアスベストを使用したが、他の種類のアスベストでも本発明は適用可能である。また、フロン１２以外のフロンを使用することも可能である。 In the first embodiment, chrysotile asbestos is used, but the present invention is applicable to other types of asbestos. It is also possible to use chlorofluorocarbon other than chlorofluorocarbon 12 .
ＳＴ１，ＳＴ２，ＳＴ３ 実験の各ステップ ST1, ST2, ST3 Experiment steps
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| JP5277598B2 (en) * | 2006-09-28 | 2013-08-28 | 三菱マテリアル株式会社 | Method for detoxifying asbestos-containing material using cement production process and method for producing cement |
| JP4985277B2 (en) * | 2006-09-28 | 2012-07-25 | 三菱マテリアル株式会社 | Method for treating asbestos-containing material using cement production process and method for producing cement |
| JP5023927B2 (en) * | 2006-09-28 | 2012-09-12 | 三菱マテリアル株式会社 | Method for treating asbestos-containing material and fluoride sludge, and method for producing cement |
| JP2008132479A (en) * | 2006-10-23 | 2008-06-12 | Sumitomo Osaka Cement Co Ltd | Treatment method of asbestos-containing waste material |
| JP5317459B2 (en) * | 2006-10-23 | 2013-10-16 | 住友大阪セメント株式会社 | Processing method for waste materials containing asbestos |
| JP2008132478A (en) * | 2006-10-23 | 2008-06-12 | Sumitomo Osaka Cement Co Ltd | Treatment method of asbestos-containing waste material |
| JP2009005822A (en) * | 2007-06-27 | 2009-01-15 | Matsumura Sogo Kagaku Kenkyusho:Kk | Treatment method of asbestos-containing substance |
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| JP4968141B2 (en) * | 2008-03-31 | 2012-07-04 | 三菱マテリアル株式会社 | Method for detoxifying asbestos-containing material and method for producing cement |
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