JP2008105897A - Molten slag-treating facility, and molten slag treatment method using the facility - Google Patents
Molten slag-treating facility, and molten slag treatment method using the facility Download PDFInfo
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- JP2008105897A JP2008105897A JP2006290170A JP2006290170A JP2008105897A JP 2008105897 A JP2008105897 A JP 2008105897A JP 2006290170 A JP2006290170 A JP 2006290170A JP 2006290170 A JP2006290170 A JP 2006290170A JP 2008105897 A JP2008105897 A JP 2008105897A
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- 239000002893 slag Substances 0.000 title claims abstract description 174
- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 90
- 230000002378 acidificating effect Effects 0.000 claims abstract description 33
- 238000002844 melting Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 7
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 239000007864 aqueous solution Substances 0.000 claims description 42
- 230000006641 stabilisation Effects 0.000 claims description 17
- 238000011105 stabilization Methods 0.000 claims description 17
- 239000000725 suspension Substances 0.000 claims description 15
- 239000002351 wastewater Substances 0.000 claims description 6
- 238000003672 processing method Methods 0.000 claims description 4
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 21
- 239000004568 cement Substances 0.000 abstract description 12
- 238000010828 elution Methods 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 11
- 229910052782 aluminium Inorganic materials 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 239000003513 alkali Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 229910052718 tin Inorganic materials 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000004692 metal hydroxides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002013 dioxins Chemical class 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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Classifications
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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
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
- C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Gasification And Melting Of Waste (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Furnace Details (AREA)
Abstract
Description
本発明は溶融スラグ処理設備とこの設備を用いた溶融スラグ処理方法に関し、詳しくは、溶融処理設備から発生する溶融スラグを受け入れ水冷して水砕スラグを形成する水砕スラグ槽と、この水砕スラグ槽に配置され水砕スラグを搬出する搬送装置と、この搬送装置により搬出された水砕スラグを受け入れる貯槽とを有する溶融スラグ処理設備とこの設備を用いた溶融スラグ処理方法に関する。 The present invention relates to a molten slag treatment facility and a molten slag treatment method using the facility, and more specifically, a granulated slag tank that receives the molten slag generated from the melt treatment facility and forms a granulated slag by water cooling, and the granulated slag tank. The present invention relates to a molten slag treatment facility having a conveying device arranged in a slag tank and carrying out the granulated slag, and a storage tank for receiving the granulated slag carried out by the conveying device, and a molten slag treatment method using this facility.
各種ゴミなどの廃棄物を焼却する焼却設備から排出される残渣物である焼却灰や飛灰には、ダイオキシン類や有害重金属類などの有害物質が含まれている。このような有害物質を無害化すると共に、焼却残渣物を減容化し、更に溶融固化物（スラグ）としてリサイクル可能にする有効な方法として、残渣物を溶融固化する処理方法が用いられている。 Incineration ash and fly ash, which are residues from incineration equipment that incinerates various types of waste and other waste, contain harmful substances such as dioxins and toxic heavy metals. As an effective method for detoxifying such harmful substances, reducing the volume of the incineration residue, and further allowing it to be recycled as a melt-solidified product (slag), a treatment method for melting and solidifying the residue is used.
スラグをリサイクルする際には、道路用骨材やコンクリート用骨材のような土木建築資材として利用することが多いが、スラグ中に含まれているアルミニウム等が、下記反応によりセメント中のアルカリと反応して水素を発生するため、コンクリート内部に気泡を生じて、初期硬化時に膨張が起こることがある。コンクリートに膨張が生じると、強度が低下するという問題がある。 When recycling slag, it is often used as civil engineering and building materials such as road aggregate and concrete aggregate. However, aluminum contained in slag is mixed with alkali in cement by the following reaction. Since it reacts to generate hydrogen, bubbles may be generated inside the concrete and expansion may occur during initial curing. When expansion occurs in concrete, there is a problem that strength decreases.
２Ａｌ＋Ｃａ（ＯＨ）2 ＋２Ｈ2 Ｏ→ＣａＯ・Ａｌ2 Ｏ3 ＋３Ｈ2 ↑
そこで、スラグ中に含まれているアルミニウムを除去あるいは無害化する処理方法が提案されている（特許文献１）。更には、スラグ水砕水中のｐＨを９〜１２に保持することにより水砕水中の重金属類を水酸化物として懸濁させてＳＳ化する処理方法が提案されている（特許文献２）。
2Al + Ca (OH) 2 + 2H 2 O → CaO · Al 2 O 3 + 3H 2 ↑
Then, the processing method which removes or detoxifies the aluminum contained in slag is proposed (patent document 1). Furthermore, the processing method which suspends the heavy metals in granulated water as a hydroxide by hold | maintaining pH in slag granulated water at 9-12 is proposed (patent document 2).
しかしながら、上記従来技術の内、前者の方法では、スラグ中のアルミニウムの形状や大きさによって分離することが困難な場合が多いだけでなく、アルミニウム等の分離のために、磁選機、破砕機、振動篩を設置するなど、設備構成が大かがりとなり、処理コストが多くならざるを得ないという問題がある。しかも、アルカリ性の水溶液で注水操作をした後、中和工程を採用していないため、スラグに付着したアルカリ成分に起因する重金属類が溶出する可能性がある。例えば、重金属類のＰｂは両性金属であり、アルカリ性が強いほど溶解度が上昇するため、溶出量が増大するという問題がある。 However, among the above conventional techniques, the former method is often difficult to separate depending on the shape and size of aluminum in the slag, but also for separation of aluminum and the like, a magnetic separator, crusher, There is a problem that the equipment configuration becomes heavy, such as installing a vibration sieve, and the processing cost must be increased. And since the neutralization process is not employ | adopted after water injection operation with alkaline aqueous solution, the heavy metals resulting from the alkali component adhering to slag may elute. For example, the heavy metal Pb is an amphoteric metal, and the higher the alkalinity, the higher the solubility, which increases the amount of elution.
また、後者の場合、重金属類の水酸化物（懸濁物）がスラグコンベアによって排出されるスラグと共に系外に持ち出されるため、スラグに重金属類の水酸化物が混入した状態となり、例えば、これが自然環境中に晒された場合、酸性雨などの影響を受けて再度、重金属類が溶出する可能性があるという問題がある。のみならず、特許文献１と同様に、この技術も後段に中和工程あるいは水洗浄工程がないため、スラグに付着したアルカリ成分に起因する重金属類が溶出するという問題がある。更に、スラグコンベア内のスラグ水砕水をアルカリ性に保持することにより、スラグ水砕水の塩濃度が増加し、スラグ水砕水と接触する機器が腐食したり、機器へスケールが固着したりするという問題もある。
In the latter case, since the heavy metal hydroxide (suspension) is taken out of the system together with the slag discharged by the slag conveyor, the slag is mixed with the heavy metal hydroxide. When exposed to the natural environment, there is a problem that heavy metals may be eluted again under the influence of acid rain. As well as
そこで、本発明の目的は、上記従来技術の問題点に鑑みて、大掛かりな設備構成を要することなく、水砕スラグをセメントと混合してコンクリート用骨材として使用したとしても、セメントのアルカリ成分と反応して水素を発生させることを抑制して、コンクリート内部に気泡を生じさせることを防止可能にすると共に、自然環境下においても重金属類の溶出を抑制可能な溶融スラグ処理設備とこの設備を用いた溶融スラグ処理方法を提供することにある。 Therefore, in view of the above-mentioned problems of the prior art, the object of the present invention is not to require a large equipment configuration, and even if granulated slag is mixed with cement and used as an aggregate for concrete, the alkaline component of cement It is possible to prevent the generation of hydrogen by reacting with the molten slag, and to prevent the generation of bubbles inside the concrete, and to provide a molten slag treatment facility capable of suppressing elution of heavy metals even in the natural environment and this facility. The object is to provide a molten slag treatment method used.
上記課題は、各請求項記載の発明により達成される。すなわち、本発明に係る溶融スラグ処理設備の特徴構成は、溶融処理設備から発生する溶融スラグを受け入れ水冷して水砕スラグを形成する水砕スラグ槽と、この水砕スラグ槽に配置され水砕スラグを搬出する搬送装置と、この搬送装置により搬出された水砕スラグを受け入れる貯槽とを有する溶融スラグ処理設備において、前記水砕スラグ槽と貯槽との間に、前記搬送装置により搬送された水砕スラグを安定化処理する安定化処理機構が設けられていて、この安定化処理機構はアルカリ水供給手段と酸性水供給手段とがこの順で設けられて構成されていることにある。 The above-mentioned subject is achieved by the invention described in each claim. That is, the characteristic configuration of the molten slag treatment facility according to the present invention includes a granulated slag tank that receives the molten slag generated from the melt treatment facility and water-cools to form a granulated slag, and the granulated slag tank disposed in the granulated slag tank. In a molten slag treatment facility having a transport device for transporting slag and a storage tank for receiving the granulated slag transported by the transport device, the water transported by the transport device between the granulated slag tank and the storage tank A stabilization processing mechanism for stabilizing the crushed slag is provided, and this stabilization processing mechanism is constituted by an alkaline water supply means and an acidic water supply means provided in this order.
この構成によれば、水砕スラグ槽に受け入れられた水砕スラグを、まずアルカリ水により十分に反応させて水砕スラグ中に含まれるＡｌ、Ｚｎ、Ｓｎ粒子などの両性金属を不活性化して安定化させると共に、酸性水供給手段により、水砕スラグに付着しているアルカリ性水溶液を除去あるいは中和して、Ｐｂなどの重金属類の溶出を防止することができるので、水砕スラグをコンクリート用骨材などに使用しても、セメントのアルカリ成分と反応して水素が発生するのを効果的に抑制できる。また、酸性水あるいは水で除去をできるのは、アルカリ性水溶液のみでなく、水砕スラグに付着している溶出リスクの高い重金属も含まれるため、自然環境下に晒されたとしても重金属類の溶出を確実に防止できるものとなる。 According to this configuration, the granulated slag received in the granulated slag tank is first sufficiently reacted with alkaline water to inactivate amphoteric metals such as Al, Zn, and Sn particles contained in the granulated slag. In addition to stabilization, the acidic water supply means can remove or neutralize the alkaline aqueous solution adhering to the granulated slag to prevent the elution of heavy metals such as Pb. Even when used as an aggregate, it is possible to effectively suppress the generation of hydrogen by reacting with an alkali component of cement. In addition, acidic water or water can be removed not only in alkaline aqueous solution but also heavy metals attached to granulated slag, which has a high risk of elution, so that even if exposed to the natural environment, the elution of heavy metals Can be surely prevented.
その結果、大掛かりな設備構成を要することなく、水砕スラグをセメントと混合してコンクリート用骨材として使用したとしても、セメントのアルカリ成分と反応して水素を発生させることを抑制して、コンクリート内部に気泡を生じさせることを防止可能にすると共に、自然環境下においても重金属類の溶出を抑制可能な溶融スラグ処理設備を提供することができた。 As a result, even if granulated slag is mixed with cement and used as a concrete aggregate without requiring a large-scale equipment configuration, it suppresses generation of hydrogen by reacting with the alkali components of cement, It was possible to provide a molten slag treatment facility capable of preventing bubbles from being generated inside and suppressing elution of heavy metals even in a natural environment.
前記安定化処理機構が前記水砕スラグ槽に配置されていて、前記アルカリ水供給手段が、前記搬送装置により搬送された水砕スラグにｐＨ１０〜１４のアルカリ性水溶液を供給する装置であり、前記酸性水供給手段がアルカリ性水溶液を供給された水砕スラグに対してｐＨ５〜７の弱酸性水溶液あるいは水を供給する装置であることが好ましい。 The stabilization treatment mechanism is disposed in the granulated slag tank, and the alkaline water supply means is an apparatus that supplies an alkaline aqueous solution having a pH of 10 to 14 to the granulated slag transported by the transport device. It is preferable that the water supply means is a device for supplying a weakly acidic aqueous solution having a pH of 5 to 7 or water to the granulated slag supplied with the alkaline aqueous solution.
この構成によれば、水砕スラグ中に含まれる両性金属を一層効果的に不活性化して安定化できると共に、重金属類の溶出を一層確実に防止できるものとなる。ｐＨが７以上１０未満のアルカリ性水溶液を水砕スラグに供給するだけでは、両性金属粒子の表面に形成される被膜が、例えば、強アルカリ性であるセメントと混合した際には破れるため、内部に残存する両性金属から水素が発生する可能性がある。従って、両性金属を充分安定化するために、ｐＨが１０〜１４の強アルカリ性水溶液を供給する必要がある。一方、その後供給する弱酸性水溶液のｐＨが５未満では、設備機器の腐食の進行が促進されるおそれがあって好ましくない。 According to this configuration, the amphoteric metal contained in the granulated slag can be more effectively deactivated and stabilized, and elution of heavy metals can be prevented more reliably. By simply supplying an alkaline aqueous solution having a pH of 7 or more and less than 10 to the granulated slag, the coating formed on the surface of the amphoteric metal particles is broken when mixed with, for example, a strong alkaline cement, and therefore remains inside. Hydrogen may be generated from the amphoteric metal. Therefore, in order to sufficiently stabilize the amphoteric metal, it is necessary to supply a strong alkaline aqueous solution having a pH of 10 to 14. On the other hand, if the pH of the weakly acidic aqueous solution to be supplied thereafter is less than 5, it is not preferable because the progress of corrosion of the equipment may be accelerated.
前記スラグ水砕水が、前記水砕スラグ槽から排出されるようになっていると共に、排出されたスラグ水砕水に含まれる懸濁物を除く懸濁物除去装置が設けられていて、この懸濁物除去装置より懸濁物を除去された排水を前記水砕スラグ槽に送給・循環するようになっていることが好ましい。 The slag granulated water is discharged from the granulated slag tank, and a suspension removing device for removing a suspension contained in the discharged slag granulated water is provided. It is preferable that the waste water from which the suspended matter is removed by the suspended matter removing device is fed and circulated to the granulated slag tank.
この構成によれば、水砕スラグに対するアルカリ水溶液や酸性水溶液の供給によって生じる、重金属類を含む懸濁物（ＳＳ）が発生したスラグ水砕水から懸濁物を除去した排水をスラグ水砕水として再利用でき、それだけ処理コストを低減できる。 According to this configuration, slag granulated water is obtained by removing suspended matter from slag granulated water in which a suspension (SS) containing heavy metals generated by supplying an alkaline aqueous solution or an acidic aqueous solution to the granulated slag. As a result, the processing cost can be reduced accordingly.
また、本発明に係る溶融スラグ処理方法の特徴構成は、溶融処理設備から発生する溶融スラグを水砕スラグ槽に受け入れ水冷して水砕スラグを形成し、この水砕スラグを前記水砕スラグ槽から搬送装置により搬出し、この搬送装置により搬出された水砕スラグを貯槽に受け入れる溶融スラグ処理方法において、前記水砕スラグ槽と貯槽との間に設けられた安定化処理機構により、前記搬送装置により搬送された水砕スラグを安定化処理するにあたり、前記安定化処理機構を構成するアルカリ水供給手段により前記水砕スラグにアルカリ水溶液を供給し、次いで前記安定化処理機構を構成する酸性水供給手段により弱酸性水溶液あるいは水を供給することにある。 The molten slag treatment method according to the present invention is characterized in that the molten slag generated from the melt treatment facility is received in a granulated slag tank and cooled with water to form a granulated slag, and the granulated slag is converted into the granulated slag tank. In the molten slag processing method for carrying out the granulated slag carried out by the conveying device into the storage tank, the stabilizing device provided between the granulated slag tank and the storage tank allows the conveying device to When the granulated slag transported by is stabilized, an alkaline aqueous solution is supplied to the granulated slag by the alkaline water supply means constituting the stabilization treatment mechanism, and then the acidic water supply constituting the stabilization treatment mechanism It is to supply a weakly acidic aqueous solution or water by means.
この構成によれば、大掛かりな設備構成を要することなく、水砕スラグをセメントと混合してコンクリート用骨材として使用したとしても、セメントのアルカリ成分と反応して水素を発生させることを抑制して、コンクリート内部に気泡を生じさせることを防止可能にすると共に、自然環境下においても重金属類の溶出を抑制可能な溶融スラグ処理設備を用いた溶融スラグ処理方法を提供することができる。 According to this configuration, even if granulated slag is mixed with cement and used as a concrete aggregate without requiring a large-scale equipment configuration, it is possible to suppress generation of hydrogen by reacting with the alkali component of cement. Thus, it is possible to provide a molten slag treatment method using a molten slag treatment facility that can prevent bubbles from being generated in the concrete and can suppress elution of heavy metals even in a natural environment.
前記アルカリ性水溶液がｐＨ１０〜１４のアルカリ性水溶液であり、弱酸性水溶液あるいは水がｐＨ５〜７の弱酸性水溶液あるいは水であることが好ましい。 The alkaline aqueous solution is preferably an alkaline aqueous solution having a pH of 10 to 14, and the weakly acidic aqueous solution or water is preferably a weakly acidic aqueous solution having a pH of 5 to 7 or water.
この構成によれば、水砕スラグ中に含まれる両性金属を一層効果的に不活性化して安定化できると共に、重金属類の溶出を一層確実に防止できる。 According to this configuration, the amphoteric metal contained in the granulated slag can be more effectively deactivated and stabilized, and elution of heavy metals can be more reliably prevented.
前記スラグ水砕水を、前記水砕スラグ槽から排出すると共に、排出されたスラグ水砕水に含まれる懸濁物を懸濁物除去装置により除去し、この懸濁物除去装置より懸濁物を除去された排水を前記水砕スラグ槽に送給・循環することが好ましい。 The slag crushed water is discharged from the pulverized slag tank, and the suspension contained in the discharged slag crushed water is removed by a suspension removing device, and the suspended matter is removed from the suspension removing device. It is preferable to feed and circulate the waste water from which water has been removed to the granulated slag tank.
この構成によれば、排水を再利用できて、処理コストを低減できる。 According to this configuration, waste water can be reused, and processing costs can be reduced.
本発明の実施形態を、図面を参照して詳細に説明する。図１は、本実施形態に係る溶融スラグ処理設備の概略全体構成を示す。 Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic overall configuration of a molten slag treatment facility according to the present embodiment.
この溶融スラグの処理設備は、各種ごみなどの廃棄物である被溶融物が投入されて処理される溶融処理設備である溶融炉１から排出されたスラグＳを、急冷するスラグ水砕水２ａで満たされた水砕スラグ槽２を有していると共に、この水砕スラグ槽２に水砕スラグを受け入れて搬送するスラグコンベア装置３が配置されて構成されている。スラグＳは、水砕スラグ槽２に落下して固化すると共に、固化され水砕されたスラグはスラグコンベア装置３によって搬送され、大気中に引き上げられる。
This molten slag processing facility is a slag granulated
引き上げられた水砕スラグに対して、水砕スラグをコンクリートに混在させた場合に、強アルカリ成分であるセメントと反応してコンクリート中に気泡を発生させないように安定化処理するための安定化処理機構が、水砕スラグ槽２に配置され設けられている。この安定化処理機構は、アルカリ水溶液をノズルから散水するアルカリ水供給手段４と、酸性水溶液あるいは水をノズルから散水する酸性水供給手段５とを備えて構成されている。
Stabilization treatment for the granulated slag that has been lifted so that when granulated slag is mixed with concrete, it reacts with cement, which is a strong alkali component, so that bubbles are not generated in the concrete. A mechanism is disposed and provided in the granulated
安定化処理された水砕スラグは、更に、貯槽であるスラグピット６に投入されて一旦貯蔵され、適宜運び出されて骨材などとしての利用に供される。 The stabilized granulated slag is further put into the slag pit 6 which is a storage tank, temporarily stored, transported appropriately, and used as an aggregate or the like.
アルカリ水溶液としては、例えば、水酸化カルシウム溶液や水酸化ナトリウム溶液などを使用できる。酸性水溶液としては、塩酸、硝酸、硫酸などを使用することができる。 As the alkaline aqueous solution, for example, a calcium hydroxide solution or a sodium hydroxide solution can be used. As the acidic aqueous solution, hydrochloric acid, nitric acid, sulfuric acid and the like can be used.
一方、スラグ水砕水２ａは、アルカリ水溶液や酸性水溶液の供給によって、重金属類を含有する懸濁物（ＳＳ）が発生するので、適宜排出すると共に、懸濁物除去装置７によって懸濁物を除去し、この排水をスラグ冷却水槽８に貯槽して、ポンプＰによりスラグコンベア装置３を備えるスラグ水砕水２ａに加えて、再利用するようになっている。
On the other hand, the slag crushed
安定化処理機構を構成するアルカリ水供給手段４と酸性水供給手段５について、以下に説明する。アルカリ水供給手段４は、スラグコンベア装置３により引き上げられてきた水砕スラグに対して、ｐＨ１０〜１４の強アルカリ性水溶液を散水するようになっている。この散水により、水砕スラグ中に含まれるＡｌ、Ｚｎ、Ｓｎ粒子などの両性金属が不活性となり、安定化する。
The alkaline water supply means 4 and the acidic water supply means 5 constituting the stabilization processing mechanism will be described below. The alkaline water supply means 4 sprays a strongly alkaline aqueous solution having a pH of 10 to 14 on the granulated slag that has been pulled up by the
次いで、酸性水供給手段５からｐＨ５〜７の弱酸性水溶液あるいは水を水砕スラグに散水・洗浄することにより、水砕スラグに付着しているアルカリ性水溶液を除去あるいは中和して、Ｐｂなどの重金属類の溶出を防止する。 Next, the acidic water supply means 5 removes or neutralizes the alkaline aqueous solution adhering to the granulated slag by sprinkling / washing the weakly acidic aqueous solution having a pH of 5 to 7 or water into the granulated slag to remove Pb or the like. Prevent elution of heavy metals.
この場合、アルカリ性水溶液の散水による反応を、水砕スラグ中に含まれているＡｌを例に挙げて、以下に説明する。 In this case, the reaction by water spraying of the alkaline aqueous solution will be described below by taking Al contained in the granulated slag as an example.
アルカリ性水溶液が弱アルカリ性（ｐＨ７以上１０未満）の場合、下記（１）式の反応が生じる。
When the alkaline aqueous solution is weakly alkaline (
Ａｌ＋３ＯＨ−＋３Ｈ2Ｏ→Ａｌ（ＯＨ）3＋３ＯＨ−＋３／２Ｈ2 （１）
ここで生成するＡｌ（ＯＨ）3は、水への溶解度積が１０-32 と極めて小さいため、Ａｌ粒子の表面にＡｌ（ＯＨ）3の被膜が形成され、反応が進まなくなる。しかし、Ａｌ粒子内部では活性な金属Ａｌが残存することになるため、水砕スラグをこのような弱アルカリ性水溶液で処理しても、強アルカリ性のセメントと混合すると、下記反応式（２）により、Ａｌ（ＯＨ）3の被膜が溶解する。
Al + 3OH − + 3H 2 O → Al (OH) 3 + 3OH − + 3 / 2H 2 (1)
The Al (OH) 3 produced here has an extremely low solubility product in water of 10 −32 , so that a coating of Al (OH) 3 is formed on the surface of the Al particles, and the reaction does not proceed. However, since active metal Al remains inside the Al particles, even when the granulated slag is treated with such a weak alkaline aqueous solution and mixed with strong alkaline cement, the following reaction formula (2): The Al (OH) 3 coating dissolves.
Ａｌ（ＯＨ）3＋ＯＨ−＋２Ｈ2Ｏ→［Ａｌ（ＯＨ）4（Ｈ2Ｏ）2］− （２）
強アルカリ性（ｐＨ１０以上）の下で、Ａｌ（ＯＨ）3の被膜が溶解すると、内部に残存するＡｌに反応式（３）の反応が生じることによってＨ2 が発生し、コンクリートを膨張させることになる。
Al (OH) 3 + OH − + 2H 2 O → [Al (OH) 4 (H 2 O) 2 ] − (2)
Under the strong alkalinity (pH of 10 or more), when the Al (OH) 3 coating is dissolved, the reaction of the reaction formula (3) occurs in the Al remaining inside, thereby generating H 2 and expanding the concrete. Become.
Ａｌ＋ＯＨ−＋５Ｈ2Ｏ→［Ａｌ（ＯＨ）4（Ｈ2Ｏ）2］−＋３／２Ｈ2 （３）
従って、スラグ中のＡｌを安定化するためには、ｐＨが１０以上である強アルカリ性水溶液を用いて、予め反応式（３）の反応を完了させ、Ｈ2を十分に発生させてしまうことが必要である。反応式（３）の反応を完了させるためには、より高いｐＨの水溶液を用いたり、固液の接触を長時間保ったりすることが好ましい。この場合、アルカリ塩の発生により機器に腐食が発生することなどが考えられるため、そのｐＨは設備機器の材質、スラグの排出量、水温などを考慮して選択される。
Al + OH − + 5H 2 O → [Al (OH) 4 (H 2 O) 2 ] − + 3 / 2H 2 (3)
Therefore, in order to stabilize Al in the slag, the reaction of the reaction formula (3) is completed in advance using a strong alkaline aqueous solution having a pH of 10 or more, and H 2 is sufficiently generated. is necessary. In order to complete the reaction of the reaction formula (3), it is preferable to use an aqueous solution having a higher pH or keep the solid-liquid contact for a long time. In this case, since it is considered that corrosion occurs in the equipment due to the generation of alkali salt, the pH is selected in consideration of the material of the equipment, the amount of slag discharged, the water temperature, and the like.
アルカリ性水溶液がスラグに付着したままでは、スラグ中のＰｂ等の重金属類が後に溶出する可能性がある。そこで、スラグに付着しているアルカリ性水溶液を除去したり、中和したりするため、水や弱酸性水で散水洗浄を行う。弱酸性水のｐＨは、５未満であると、設備機器が腐食するおそれがあるため、５〜７程度であることが好ましい。スラグ水砕水のｐＨを中性に保つために、水を散水するより、弱酸性水で散水することが好ましい。 If the alkaline aqueous solution remains attached to the slag, heavy metals such as Pb in the slag may be eluted later. Therefore, in order to remove or neutralize the alkaline aqueous solution adhering to the slag, water washing with water or weakly acidic water is performed. If the pH of the weakly acidic water is less than 5, the equipment may be corroded, so it is preferably about 5 to 7. In order to keep the pH of the slag granulated water neutral, it is preferable to sprinkle with weakly acidic water rather than water.
上記したアルカリ水供給手段４と酸性水供給手段５は、いずれもコンベア搬送過程において搬送される水砕スラグに散水するように構成したが、これは、コンクリート膨張の原因である水素の発生が、水砕スラグに含まれる微粒のＡｌ、Ｚｎ、Ｓｎ粒子によるためである。粗粒のものは比表面積が小さいため水素発生が少なく、コンクリート膨張に与える影響は少ない。また、Ａｌには延性があるため、スラグコンベア装置３の後段に設置される粒度調整のためのスラグ破砕機で破砕できず、ふるい等で除去可能なため問題とならない。従って、微粒のＡｌ、Ｚｎ、Ｓｎ粒子などを安定化させるためだけでなく、コンベア搬送過程で搬送される短い時間で十分安定化できる。
Both the alkaline water supply means 4 and the acidic water supply means 5 are configured to sprinkle the granulated slag that is transported in the conveyor transport process. This is because the generation of hydrogen that causes the concrete expansion, This is because fine Al, Zn, and Sn particles contained in the granulated slag. Coarse particles have a small specific surface area, so there is little hydrogen generation and little influence on concrete expansion. Moreover, since Al has ductility, it cannot be crushed by a slag crusher for adjusting the particle size installed at the subsequent stage of the
〔別実施の形態〕
（１）上記実施形態において、水砕スラグを安定化処理するアルカリ水供給手段と酸性水供給手段とにより水砕スラグに安定化処理を施す際、アルカリ水供給手段と酸性水供給手段とを水砕スラグ槽の後段側に配置し、引き上げられた水砕スラグに対してアルカリ水と酸性水を散水するようにしたが、アルカリ水供給手段と酸性水供給手段とを水砕スラグ槽とは別の槽として設けて配置し、順次水砕スラグに散水して安定化処理を施すようにしてもよい。
[Another embodiment]
(1) In the above embodiment, when the stabilization treatment is performed on the granulated slag by the alkaline water supply means and the acidic water supply means for stabilizing the granulated slag, the alkaline water supply means and the acidic water supply means are treated with water. It was arranged on the rear side of the crushed slag tank, and alkaline water and acidic water were sprinkled on the raised granulated slag, but the alkaline water supply means and acidic water supply means were separated from the granulated slag tank. It may be provided and arranged as a tank, and may be subjected to stabilization treatment by watering the granulated slag sequentially.
１ 溶融処理設備
２ 水砕スラグ槽
３ 搬送装置（スラグコンベア装置）
４ アルカリ水供給手段
５ 酸性水供給手段
６ 貯槽
1
4 Alkaline water supply means 5 Acidic water supply means 6 Storage tank
Claims (6)
前記水砕スラグ槽と貯槽との間に、前記搬送装置により搬送された水砕スラグを安定化処理する安定化処理機構が設けられていて、この安定化処理機構はアルカリ水供給手段と酸性水供給手段とがこの順で設けられて構成されていることを特徴とする溶融スラグ処理設備。 A granulated slag tank that receives the molten slag generated from the melting treatment facility and forms water granulated slag by water cooling, a transport device that is disposed in the granulated slag tank and carries out the granulated slag, and is transported by the transport device In a molten slag treatment facility having a storage tank for receiving granulated slag,
Between the granulated slag tank and the storage tank, a stabilization processing mechanism for stabilizing the granulated slag transported by the transport device is provided, and the stabilization processing mechanism includes alkaline water supply means and acidic water. A molten slag treatment facility characterized in that a supply means is provided in this order.
前記水砕スラグ槽と貯槽との間に設けられた安定化処理機構により、前記搬送装置により搬送された水砕スラグを安定化処理するにあたり、前記安定化処理機構を構成するアルカリ水供給手段により前記水砕スラグにアルカリ水溶液を供給し、次いで前記安定化処理機構を構成する酸性水供給手段により弱酸性水溶液あるいは水を供給することを特徴とする溶融スラグ処理方法。 The molten slag generated from the melting treatment facility is received in a granulated slag tank and cooled with water to form a granulated slag. The granulated slag is transported from the granulated slag tank by a transport device, and the water transported by the transport device In the molten slag processing method for receiving crushed slag in a storage tank,
When stabilizing the granulated slag transported by the transport device by the stabilization processing mechanism provided between the granulated slag tank and the storage tank, by the alkaline water supply means constituting the stabilization processing mechanism A molten slag treatment method, wherein an alkaline aqueous solution is supplied to the granulated slag, and then a weak acidic aqueous solution or water is supplied by an acidic water supply means constituting the stabilization treatment mechanism.
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