JP2008049205A - Treatment method of chrysotile or chrysotile inclusion - Google Patents
Treatment method of chrysotile or chrysotile inclusion Download PDFInfo
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- 229910052620 chrysotile Inorganic materials 0.000 title claims abstract description 86
- CWBIFDGMOSWLRQ-UHFFFAOYSA-N trimagnesium;hydroxy(trioxido)silane;hydrate Chemical compound O.[Mg+2].[Mg+2].[Mg+2].O[Si]([O-])([O-])[O-].O[Si]([O-])([O-])[O-] CWBIFDGMOSWLRQ-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 30
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 20
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 13
- 239000011777 magnesium Substances 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 12
- 239000004568 cement Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000010304 firing Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 23
- 238000003672 processing method Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000002407 reforming Methods 0.000 abstract 1
- 239000010425 asbestos Substances 0.000 description 19
- 229910052895 riebeckite Inorganic materials 0.000 description 19
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000010169 landfilling Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 2
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 239000010784 textile waste Substances 0.000 description 2
- 238000002411 thermogravimetry Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- XYCWOLUUHSNDRX-UHFFFAOYSA-L [dioxido-[oxo(trioxidosilyloxy)silyl]oxysilyl]oxy-[[dioxido-[oxo(trioxidosilyloxy)silyl]oxysilyl]oxy-oxosilyl]oxy-dioxidosilane iron(2+) dihydroxide Chemical compound [OH-].[OH-].[Fe++].[Fe++].[Fe++].[Fe++].[Fe++].[Fe++].[Fe++].[O-][Si]([O-])([O-])O[Si](=O)O[Si]([O-])([O-])O[Si](=O)O[Si]([O-])([O-])O[Si]([O-])([O-])O[Si](=O)O[Si]([O-])([O-])[O-] XYCWOLUUHSNDRX-UHFFFAOYSA-L 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010454 slate Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- ULEFFCDROVNTRO-UHFFFAOYSA-N trimagnesium;disodium;dihydroxy(oxo)silane;iron(3+) Chemical compound [Na+].[Na+].[Mg+2].[Mg+2].[Mg+2].[Fe+3].[Fe+3].O[Si](O)=O.O[Si](O)=O.O[Si](O)=O.O[Si](O)=O.O[Si](O)=O.O[Si](O)=O.O[Si](O)=O.O[Si](O)=O ULEFFCDROVNTRO-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Processing Of Solid Wastes (AREA)
Abstract
Description
本発明は、クリソタイルまたはクリソタイル含有物に含まれるクリソタイルを非クリソタイルにする処理方法に関する。 The present invention relates to a processing method for converting a chrysotile contained in a chrysotile or a chrysotile-containing material into a non-chrysotile.
石綿は、クリソタイル（白石綿）、アモサイト（茶石綿）およびクロシドライト（青石綿）等があり、いずれも耐熱性や耐摩耗性等に優れているため、スレート板等の繊維強化セメント板、吹付け耐火被覆材、吹付け吸音材、自動車用ブレーキパッドおよび石綿紡織品等の製品として、広い分野で使用されてきた。ここで、日本において使用された石綿の殆どはクリソタイルである。
しかし、近年、人の健康に対する石綿の有害性が顕在化するに至り、石綿使用は原則として禁止されることになった。しかし、一方で既に石綿が使用された建築物や自動車等の石綿含有製品は、今後、改修や解体の時期を迎えることから、石綿廃材として大量に排出されることが確実視され、石綿廃材の処理が深刻な社会問題になりつつある。
Asbestos includes chrysotile (white asbestos), amosite (brown asbestos) and crocidolite (blue asbestos), all of which are excellent in heat resistance and wear resistance, so fiber reinforced cement boards such as slate boards, spraying It has been used in a wide range of fields as products such as fireproof coating materials, spray sound absorbing materials, automobile brake pads and asbestos textiles. Here, most of the asbestos used in Japan is chrysotile.
In recent years, however, the use of asbestos has been banned as a general rule, as the harmfulness of asbestos to human health has become apparent. However, on the other hand, asbestos-containing products such as buildings and automobiles that already use asbestos are expected to be discharged in large quantities as asbestos waste because it will be repaired and dismantled in the future. Processing is becoming a serious social problem.
ここで、現在実施されている石綿の処理方法としては、石綿廃材を飛散性石綿または非飛散性石綿に分けて、それぞれ特別管理産業廃棄物または安定型産業廃棄物として分別・回収し、それぞれの埋め立て処分場に運搬して埋め立て処理する方法がある。しかし、近年、処分場の残存容量が逼迫しているため、今後、埋め立て処理では対処できなくなると予想されている。処分場の延命のために、石綿を高温融解して減容化する処理技術が実施されているが、減容化しても結局のところ処分場に埋め立て処理することに変わりはなく、根本的な解決手段にはならない。そこで、石綿の処理物を埋め立てることなく他の用途に使用しうる物質に変換できる処理方法が望まれている。 Here, asbestos treatment methods currently being implemented, the asbestos waste is divided into scatterable asbestos or non-scatterable asbestos and separated and collected as specially controlled industrial waste or stable industrial waste, respectively. There is a method of transporting to landfill sites and landfilling. However, in recent years, because the remaining capacity of the disposal site is tight, it is expected that landfilling will not be able to cope with it in the future. In order to prolong the life of the disposal site, processing technology to melt and reduce the volume of asbestos has been implemented, but even if the volume is reduced, there is no change to landfill treatment at the disposal site, and the fundamental It is not a solution. Therefore, there is a demand for a treatment method that can convert a processed asbestos material into a material that can be used for other purposes without being reclaimed.
かかる石綿の処理方法の一つとして、クリソタイルを主成分とするクリソタイルおよびクリソタイル含有蛇紋岩を、硫酸、塩酸等の酸で分解してシリカ質フィラーを得る技術が提案されている（特許文献１）。当該技術において開示されている処理条件として、酸の使用量は蛇紋岩または石綿に含まれるＭｇＯに対して化学当量比で２．３倍以上必要であり、また、処理温度１００℃で処理時間１時間以上が必要とされている（特許文献１ ３頁右欄２〜６行参照）。その結果得られたシリカ質フィラーは混和材等として再利用できるため（特許文献１ ３頁右欄１９〜５０行参照）、前記の埋め立て処理が不要になるという利点がある。しかし、当該技術の処理条件内であっても、例えばクリソタイルに含まれるＭｇＯに対して化学当量比で硫酸を３倍使用して、処理温度１００℃、かつ、処理時間２時間で追試してみると、得られたシリカ質フィラーにはクリソタイルが２．０質量％も残存していることを確認した（後述する本願明細書 表２中の比較例３参照）。これでは当該シリカ質フィラーを混和材等として再利用した場合には、かえって残存するクリソタイルが広い範囲に拡散してしまう虞があり、当該技術によってもクリソタイルから非クリソタイルへの変成はまだ不十分なのである。
そこで、本発明は、クリソタイルまたはクリソタイル含有物（以下「クリソタイル等」という。）に含まれるクリソタイルをクリソタイルの検出限界未満にまで変成することができる処理方法を提供することを目的とする。また、本発明は、得られた処理物を有効利用できる処理方法をも提供することを目的とする。 Then, an object of this invention is to provide the processing method which can modify | regenerate the chrysotile contained in a chrysotile or a chrysotile containing material (henceforth "chrysotile etc.") to below the detection limit of chrysotile. Another object of the present invention is to provide a processing method that can effectively use the obtained processed product.
かかる実情に鑑みて、本発明者らは鋭意研究を行った結果、特定の圧力および温度の水蒸気によってクリソタイル等と酸の混合物を加圧および加熱処理することにより、クリソタイルをクリソタイルの検出限界未満にまで変成できること、また、該処理物（変成物）はセメントクリンカーの焼成用原料として好適に用いることができ、これによってクリソタイル等の処理物を埋め立てることなく有効利用できる処理方法を見出し、本発明を完成した。 In view of this situation, as a result of intensive studies, the inventors of the present invention have made chrysotile below the detection limit of chrysotile by pressurizing and heating a mixture of chrysotile and the like with steam at a specific pressure and temperature. In addition, the treated product (modified product) can be suitably used as a raw material for cement clinker firing, thereby finding a treatment method that can be effectively used without landfilling the treated product such as chrysotile. completed.
すなわち、本発明は、クリソタイル等と酸を混合して、圧力１．５〜１０気圧かつ温度１１０〜１８０℃の水蒸気により加圧および加熱処理する、クリソタイル等の処理方法を提供するものである。特に、かかる圧力をかけることにより、酸が処理対象物の深部にまで浸透し、温度が均質になり、反応が均質かつ円滑に進行して、クリソタイル残存量を格段に減少させることができる。 That is, this invention provides the processing method of chrysotile etc. which mixes chrysotile etc. and an acid, and pressurizes and heat-processes with the water vapor | steam of a pressure of 1.5-10 atmospheres and a temperature of 110-180 degreeC. In particular, by applying such pressure, the acid penetrates deep into the object to be treated, the temperature becomes uniform, the reaction proceeds homogeneously and smoothly, and the residual amount of chrysotile can be significantly reduced.
また、前記の酸は、好ましくは硫酸または塩酸であり、さらに、酸とクリソタイル等の混合比が、クリソタイルに含まれるマグネシウムに換算して、酸／マグネシウム＝１〜６（化学当量比）であるクリソタイル等の処理方法をも提供する。 The acid is preferably sulfuric acid or hydrochloric acid, and the mixing ratio of acid and chrysotile is acid / magnesium = 1 to 6 (chemical equivalent ratio) in terms of magnesium contained in chrysotile. A processing method such as chrysotile is also provided.
本発明によれば、クリソタイルをクリソタイルの検出限界未満に変成でき、また、該処理物（変成物）はセメントクリンカーの焼成用原料として好適に用いることができるため、埋め立て処理が不要になるとともにセメントクリンカーの焼成用原料である天然資源の節約にもなる。 According to the present invention, chrysotile can be modified below the detection limit of chrysotile, and the treated product (modified product) can be suitably used as a raw material for cement clinker firing. It also saves natural resources, which are raw materials for clinker firing.
以下に、本発明の実施の形態を詳細に説明する。
本発明の処理対象は、クリソタイルまたはクリソタイル含有物である。クリソタイル含有物とは、石綿紡織品、繊維強化セメント板、吹付け耐火被覆材、吹付け吸音材および自動車用ブレーキパッド等の製品およびその廃棄物である。かかる対象物は、板状物、塊状物または粉粒物等いずれの形態でも使用できるが、酸との混合効率を考慮すると粉粒物が好ましい。板状物や塊状物は必要に応じて粉砕し粉粒物にして使用するのが好ましい。ここで、板状物や塊状物を粉砕する際は、クリソタイルの飛散防止のため湿式粉砕機を使用するのが好ましい。
Hereinafter, embodiments of the present invention will be described in detail.
The processing object of the present invention is chrysotile or a chrysotile-containing material. The chrysotile-containing material includes products such as asbestos textiles, fiber reinforced cement boards, sprayed fireproof coating materials, sprayed sound absorbing materials, and brake pads for automobiles, and wastes thereof. Such an object can be used in any form such as a plate-like object, a lump-like object, or a granular material, but in consideration of the mixing efficiency with the acid, the granular material is preferable. It is preferable to use a plate-like material or a lump-like material by pulverizing it as necessary. Here, when pulverizing the plate-like material or the lump-like material, it is preferable to use a wet pulverizer to prevent chrysotile scattering.
本発明で用いる酸は、硫酸または塩酸である。クリソタイルが硫酸または塩酸と接触すると、クリソタイルの表層部に存在する水酸化マグネシウムと酸が反応して、それぞれ硫酸マグネシウムまたは塩化マグネシウムが生成し、一方、クリソタイルの内層部には主としてケイ酸塩が残存した非クリソタイル生成物が得られる。特に、硫酸マグネシウムはコンクリート中の鉄筋の発錆に影響を及ぼさないから用いる酸は硫酸が好ましい。 The acid used in the present invention is sulfuric acid or hydrochloric acid. When chrysotile comes into contact with sulfuric acid or hydrochloric acid, magnesium hydroxide and acid present in the surface layer of chrysotile react with each other to produce magnesium sulfate or magnesium chloride, respectively, while silicate remains mainly in the inner layer of chrysotile. A non-chrysotile product is obtained. In particular, since magnesium sulfate does not affect the rusting of reinforcing steel in concrete, the acid used is preferably sulfuric acid.
かかる反応を効果的に進めるために、クリソタイルに含まれるマグネシウムに換算して、酸／マグネシウム＝１〜６（化学当量比）が好ましく、酸／マグネシウム＝１〜３（化学当量比）が経済性（処理コスト）の観点からより好ましく、酸／マグネシウム＝１〜２（化学当量比）が同じ観点から更に好ましい。酸／マグネシウムの化学当量比が１未満では前記の反応が完結せずクリソタイルが未反応で残存することになり、また、酸／マグネシウムの化学当量比が６を超えると酸の濃度および使用量が増加するため、取り扱い上の安全性と経済性が低下する虞がある。 In order to advance the reaction effectively, acid / magnesium = 1 to 6 (chemical equivalent ratio) is preferable in terms of magnesium contained in chrysotile, and acid / magnesium = 1 to 3 (chemical equivalent ratio) is economical. From the viewpoint of (treatment cost), acid / magnesium = 1 to 2 (chemical equivalent ratio) is more preferable from the same viewpoint. If the chemical equivalent ratio of acid / magnesium is less than 1, the above reaction is not completed and chrysotile remains unreacted. If the chemical equivalent ratio of acid / magnesium exceeds 6, the concentration and amount of acid used Since it increases, there exists a possibility that the safety | security and economical efficiency in handling may fall.
また、本発明において処理圧力は１．５〜１０気圧であり、２．０〜１０気圧がより好ましい。水蒸気の圧力が１．５気圧未満では、酸が処理対象物の内部に十分浸透せず未反応のクリソタイルが残存する虞があり、また、水蒸気の圧力が１０気圧を超えると、高温・高圧に耐える処理装置が大がかりなものとなって、処理装置の製造コストが高くなる。本発明の処理方法においてクリソタイル残存量が検出限界未満になるのは、当該圧力を有する水蒸気が処理対象物の細孔の深部にまで浸透することにより、処理対象物がムラなく均質に加熱されて、クリソタイルの酸分解が全体として（局部的でなく）進行するからであると考える。
本発明において処理温度は１１０〜１８０℃であり、１２０〜１８０℃がより好ましい。水蒸気の温度が１１０℃未満では処理時間が長くなり、また、水蒸気の温度が１８０℃を超えても処理時間を短縮する効果は少ない。
In the present invention, the treatment pressure is 1.5 to 10 atm, and more preferably 2.0 to 10 atm. If the water vapor pressure is less than 1.5 atm, the acid may not sufficiently penetrate into the object to be processed and unreacted chrysotile may remain. The withstanding processing apparatus becomes a large scale, and the manufacturing cost of the processing apparatus increases. In the treatment method of the present invention, the remaining amount of chrysotile is less than the detection limit because the water vapor having the pressure penetrates to the deep part of the pores of the treatment object, so that the treatment object is heated evenly. This is thought to be because the acid degradation of chrysotile proceeds as a whole (not locally).
In this invention, process temperature is 110-180 degreeC, and 120-180 degreeC is more preferable. When the temperature of the water vapor is less than 110 ° C., the treatment time becomes long, and even when the temperature of the water vapor exceeds 180 ° C., the effect of shortening the treatment time is small.
本発明において使用する処理装置として、例えばオートクレーブを挙げることができる。オートクレーブによれば、前記の圧力および温度下で処理を容易に行うことができ、また、処理中にクリソタイルが周辺に飛散する虞もない。 An example of the processing apparatus used in the present invention is an autoclave. According to the autoclave, the treatment can be easily performed under the pressure and temperature, and there is no possibility that the chrysotile is scattered around during the treatment.
本発明の処理方法を用いて得られる処理物は、主にケイ酸塩を含むため、セメントクリンカーの焼成用原料（ケイ素成分の補充）として使用することができる。これにより、セメントクリンカーの焼成用原料として用いる天然原料の一部を当該処理物によって置き換えることができるから、本発明は処理物の有効利用のみならず天然資源の節約にも資することができる。 Since the treated product obtained using the treatment method of the present invention mainly contains silicate, it can be used as a raw material for firing cement clinker (replenishment of silicon component). As a result, a part of the natural raw material used as the raw material for firing the cement clinker can be replaced by the treated product, and the present invention can contribute not only to the effective use of the treated product but also to the saving of natural resources.
次に、実施例を挙げて本発明をさらに具体的に説明するが、本発明はこれらの例によってなんら限定されるものではない。 Next, although an Example is given and this invention is demonstrated further more concretely, this invention is not limited at all by these examples.
〔処理対象物〕
Ａ；クリソタイル
カリドリア産出 アスベストHPO（巴工業社販売）
Ｂ；クリソタイル含有物
クリソタイル紡織布廃材（クリソタイル：ポリエステル繊維：バインダー＝８５：１２：３ 重量比）
[Object to be treated]
A: Chrysotile
Kalydria production Asbestos HPO (sales of Sakai Industry)
B: Material containing chrysotile Chrysotile textile waste material (chrysotile: polyester fiber: binder = 85: 12: 3 weight ratio)
〔使用薬品および装置〕
・硫酸；試薬特級（関東化学社製）
・塩酸；試薬特級（関東化学社製）
・耐酸耐圧容器；内部をテフロン（登録商標）加工し、過熱蒸気および不活性ガスの挿入口および排気口、温度センサーおよび圧力センサーを設置したステンレス製の耐酸耐圧容器試作品
[Chemicals and equipment used]
・ Sulfuric acid; reagent special grade (Kanto Chemical Co., Ltd.)
・ Hydrochloric acid; reagent special grade (manufactured by Kanto Chemical)
・ An acid-resistant pressure-resistant container: Teflon (registered trademark) inside, stainless steel acid-resistant pressure-resistant container with superheated steam and inert gas insertion and exhaust ports, temperature sensor and pressure sensor installed
〔クリソタイルの定量方法〕
以下の熱分析装置および分析条件を用いて、微分熱重量法（厚生労働省
基発第０７０２００４号）によりクリソタイルを分析した。なお、当該微分熱重量法によるクリソタイル含有量の検出限界は１質量％である。
（１）
熱分析装置
示差熱天秤TAS200（理学電機社製）
（２）分析条件
・昇温速度；20℃／分
・分析温度；室温〜1000℃
・雰囲気ガス；空気
[Quantitative method of chrysotile]
Chrysotile was analyzed by differential thermogravimetry (Ministry of Health, Labor and Welfare No. 0702004) using the following thermal analyzer and analysis conditions. In addition, the detection limit of chrysotile content by the differential thermogravimetry is 1% by mass.
(1)
Thermal analyzer
Differential thermal balance TAS200 (manufactured by Rigaku Corporation)
(2) Analysis conditions / temperature increase rate: 20 ° C./min/analysis temperature: room temperature to 1000 ° C.
・ Atmospheric gas: Air
〔クリソタイル等の処理〕
クリソタイルまたはクリソタイル紡織布廃材（以下、「試料」という。）を乳鉢で粉砕後、１８メッシュの篩を通過した試料の所定量を耐酸耐圧容器に入れた後、所定の濃度の硫酸または塩酸を当該容器中に所定量流し込み十分に攪拌した。
次に、当該容器に密閉蓋をした後、所定の温度で安定している乾燥機に当該容器を設置し、所定時間加熱した。その後、乾燥機から圧力容器を取出し、室温になるまで冷却し、試料が室温となった後、試料をろ過して固形分を採り出し、クリソタイルの含有量を分析した。
以上の処理条件を表１に、また、処理後のクリソタイルの含有量の分析結果を表２に示す。
[Chrysotile processing]
After chrysotile or chrysotile textile waste material (hereinafter referred to as “sample”) is pulverized in a mortar, a predetermined amount of the sample that has passed through an 18-mesh sieve is placed in an acid-resistant pressure-resistant container, and sulfuric acid or hydrochloric acid with a predetermined concentration is then added A predetermined amount was poured into the container and sufficiently stirred.
Next, after sealing the container, the container was placed in a dryer stable at a predetermined temperature and heated for a predetermined time. Thereafter, the pressure vessel was taken out from the dryer and cooled to room temperature. After the sample reached room temperature, the sample was filtered to obtain a solid content, and the content of chrysotile was analyzed.
The above treatment conditions are shown in Table 1, and the analysis results of the chrysotile content after treatment are shown in Table 2.
表２から分かるように、実施例１〜１５では、処理後のクリソタイルの含有量がすべて検出限界（１質量％）未満になった。他方、比較例１〜３では、処理後のクリソタイルの含有量はそれぞれ２４質量％、４質量％および２質量％となっており、当該処理物を広範囲に再利用する上で決して少なくない量であった。 As can be seen from Table 2, in Examples 1 to 15, the content of chrysotile after treatment was less than the detection limit (1% by mass). On the other hand, in Comparative Examples 1 to 3, the content of chrysotile after the treatment is 24% by mass, 4% by mass, and 2% by mass, respectively, and it is not insignificant for reusing the treated product over a wide range. there were.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006095314A JP2008049205A (en) | 2006-03-30 | 2006-03-30 | Treatment method of chrysotile or chrysotile inclusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006095314A JP2008049205A (en) | 2006-03-30 | 2006-03-30 | Treatment method of chrysotile or chrysotile inclusion |
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| Publication Number | Publication Date |
|---|---|
| JP2008049205A true JP2008049205A (en) | 2008-03-06 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006095314A Pending JP2008049205A (en) | 2006-03-30 | 2006-03-30 | Treatment method of chrysotile or chrysotile inclusion |
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| Country | Link |
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| JP (1) | JP2008049205A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010147208A1 (en) * | 2009-06-19 | 2010-12-23 | 国立大学法人宇都宮大学 | Standard treatment sheet and method for determining treatment method for detoxification of asbestos-containing material |
| US20110101267A1 (en) * | 2008-04-30 | 2011-05-05 | Institut National Polytechnique De Toulouse | Acid treatment under low temperature and pressure of waste containing asbestos |
| JP2014161848A (en) * | 2013-02-26 | 2014-09-08 | Korea Institute Of Geoscience And Mineral Resources | Method for removing 99% of asbestos from asbestos-containing material using low temperature heat treatment |
-
2006
- 2006-03-30 JP JP2006095314A patent/JP2008049205A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110101267A1 (en) * | 2008-04-30 | 2011-05-05 | Institut National Polytechnique De Toulouse | Acid treatment under low temperature and pressure of waste containing asbestos |
| WO2010147208A1 (en) * | 2009-06-19 | 2010-12-23 | 国立大学法人宇都宮大学 | Standard treatment sheet and method for determining treatment method for detoxification of asbestos-containing material |
| JP4880800B2 (en) * | 2009-06-19 | 2012-02-22 | 国立大学法人宇都宮大学 | Standard processing sheet and method for determining processing method for detoxifying asbestos-containing material |
| JP2014161848A (en) * | 2013-02-26 | 2014-09-08 | Korea Institute Of Geoscience And Mineral Resources | Method for removing 99% of asbestos from asbestos-containing material using low temperature heat treatment |
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