JP2003117532A - Solidifying material and solidifying method for suppressing elution of heavy metal - Google Patents

Solidifying material and solidifying method for suppressing elution of heavy metal

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Publication number
JP2003117532A
JP2003117532A JP2001311630A JP2001311630A JP2003117532A JP 2003117532 A JP2003117532 A JP 2003117532A JP 2001311630 A JP2001311630 A JP 2001311630A JP 2001311630 A JP2001311630 A JP 2001311630A JP 2003117532 A JP2003117532 A JP 2003117532A
Authority
JP
Japan
Prior art keywords
solidifying
heavy metal
elution
weight
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001311630A
Other languages
Japanese (ja)
Inventor
Masahiko Moriya
政彦 守屋
Koichi Uchida
晃一 内田
Kota Sasaki
宏太 佐々木
Keiji Omori
啓至 大森
Original Assignee
Taiheiyo Cement Corp
太平洋セメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Taiheiyo Cement Corp, 太平洋セメント株式会社 filed Critical Taiheiyo Cement Corp
Priority to JP2001311630A priority Critical patent/JP2003117532A/en
Publication of JP2003117532A publication Critical patent/JP2003117532A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a solidifying material for suppressing the elution of heavy metals which suppresses the elution of an object polluted with the heavy metals and performs the solidification treatment thereof and is further capable of stably treating amphoteric metals, such as lead and zinc, as well. SOLUTION: The solidifying material for suppressing the elution of the heavy metals consists essentially of a magnesium oxide. Gypsum, a reaction accelerator, a phosphate, a setting delaying material may also be used in combination.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【発明の属する技術分野】本発明は、重金属の不溶化処
理を行うとともに固化強度を発現させることを可能にし
た固化材および固化処理方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solidifying material and a solidifying method which are capable of insolubilizing a heavy metal and exhibiting solidifying strength.
【0002】[0002]
【従来の技術】重金属を含んだ有害廃棄物や重金属で汚
染された地盤の処理に関しては、溶融法、キレート剤等
の薬剤を用いる方法、酸化還元法及びポルトランドセメ
ント系セメントによる溶出対策が実施されている。特に
ポルトランドセメント系セメントによる処理は、当該セ
メントが安価であること、また、その水硬性により、処
理後の対象物を硬化体としたり、水分を多く含む対象物
や粉粒状の対象物を取り扱い易い性状にすることが可能
であり、運搬や管理上の優位性等から汎用的な方法とし
て実施されている。
2. Description of the Related Art Regarding the treatment of hazardous waste containing heavy metals and the ground contaminated with heavy metals, melting methods, methods using chemical agents such as chelating agents, redox methods and elution measures using Portland cement cement are implemented. ing. In particular, the treatment with Portland cement-based cement is that the cement is inexpensive and its hydraulic property makes the treated object a hardened body, and it is easy to handle an object containing a large amount of water or a granular object. It can be used as a property, and is used as a general-purpose method because of its superiority in transportation and management.
【0003】このポルトランドセメント系セメントは、
水と接触することによりケイ酸カルシウムやアルミン酸
カルシウム等の水和物とCa(OH)2を生成する。こ
のCa(OH)2は、飽和状態でpH12以上の高いア
ルカリ性を示す。しかし、生成した水和物やCa(O
H)2の作用により対象重金属を有効に溶出抑制可能な
反面、その高いアルカリ性が問題となり重金属種によっ
ては溶出抑制効果が十分に発揮しない場合がある。特
に、鉛や亜鉛等に代表されるような両性金属は、ある値
を超えたアルカリ性及び酸性条件下において溶解度の高
い塩類となる性質から、高いアルカリ性を示すポルトラ
ンドセメント系セメントによる溶出抑制が十分に発揮し
ないとされている。また、その他の方法に関しても、溶
融法は処理施設の設置、処理能力及びコストの問題、キ
レート剤による方法や酸化還元法の安定性や薬剤コスト
面及び水分の多い対象物への適用性等に多くの問題を含
んでいる。
This Portland cement-based cement is
Upon contact with water, hydrates such as calcium silicate and calcium aluminate and Ca (OH) 2 are produced. This Ca (OH) 2 shows a high alkalinity of pH 12 or higher in a saturated state. However, the generated hydrate and Ca (O
Although the action of H) 2 can effectively suppress the elution of the target heavy metal, its high alkalinity causes a problem, and depending on the heavy metal species, the elution suppressing effect may not be sufficiently exerted. In particular, amphoteric metals such as lead and zinc are salts that have high solubility under alkaline and acidic conditions exceeding a certain value, and therefore the elution suppression by the Portland cement-based cement exhibiting high alkalinity is sufficient. It is said that it will not work. In addition, regarding other methods, the melting method is related to the installation of processing facilities, the problem of processing capacity and cost, the stability of the chelating agent method and the redox method, the cost of chemicals, and the applicability to objects with high water content. It contains many problems.
【0004】[0004]
【発明が解決しようとする課題】本発明の目的は、ポル
トランドセメント系セメントよりも低いpHを示す酸化
マグネシウムを主体とした材料を用いることによって、
重金属で汚染された対象物の溶出抑制および固化処理を
行い、さらには鉛や亜鉛等の両性金属も安定的に処理す
ることが可能な重金属溶出抑制固化材を提供することに
ある。
The object of the present invention is to provide a magnesium oxide-based material having a pH lower than that of Portland cement-based cement.
An object of the present invention is to provide a heavy metal elution suppressive solidifying material capable of suppressing elution of an object contaminated with heavy metals and solidifying the same, and further stably processing amphoteric metals such as lead and zinc.
【0005】[0005]
【課題を解決するための手段】本発明の重金属溶出抑制
固化材は、材料自体がポルトランドセメント系セメント
のpHよりも低い酸化マグネシウムを主成分とし、各種
重金属の溶出を抑制するとともに、鉛や亜鉛等の両性金
属も安定的に処理するものである。(請求項1)
The solidifying material for suppressing heavy metal elution according to the present invention is composed mainly of magnesium oxide whose pH is lower than the pH of Portland cement-based cement, and suppresses elution of various heavy metals, and lead and zinc. The amphoteric metals such as the above are also stably treated. (Claim 1)
【0006】また、当該重金属溶出抑制固化材は、初期
材齢での強度発現性を改善することを目的に、無水セッ
コウ、2水セッコウや半水セッコウ等の各種セッコウを
酸化マグネシウム100重量部に対して1〜50重量部
添加するものである。(請求項2) なお、各種セッコウは天然産出品以外にも様々な副産セ
ッコウ(リン酸セッコウ、フッ酸セッコウ、排煙脱硫セ
ッコウ、セッコウボード廃材、セッコウボード用の半水
セッコウ屑等)を利用することが可能である。
[0006] Further, the heavy metal elution suppressing solidifying material is used to add various kinds of gypsum such as anhydrous gypsum, dihydrate gypsum and hemihydrate gypsum to 100 parts by weight of magnesium oxide for the purpose of improving strength development at an early age. On the other hand, 1 to 50 parts by weight is added. (Claim 2) Various gypsum products other than natural products include various by-product gypsum (phosphate gypsum, hydrofluoric acid gypsum, flue gas desulfurization gypsum, gypsum board waste materials, gypsum board waste semi-water gypsum waste, etc.). It is possible to use.
【0007】さらに、当該重金属溶出抑制固化材は、初
期材齢での強度発現性を改善することを目的に、酸化マ
グネシウムの反応促進材としてアルカリ、アルカリ土類
金属およびアルミニウムなどの水酸化マグネシウムより
も溶解度の高い各種硫酸塩、炭酸塩、硝酸塩、塩化物、
有機酸類などを、酸化マグネシウム100重量部に対し
て0.5〜30重量部添加するものである。(請求項
3)
Further, the heavy metal elution-preventing solidifying material is used as a reaction promoting agent for magnesium oxide in comparison with alkali hydroxides, alkaline earth metals, and magnesium hydroxide such as aluminum for the purpose of improving strength development at an early age. Highly soluble various sulfates, carbonates, nitrates, chlorides,
0.5 to 30 parts by weight of organic acids and the like are added to 100 parts by weight of magnesium oxide. (Claim 3)
【0008】さらに、当該重金属溶出抑制固化材は、初
期材齢での強度発現性を改善することを目的に、酸化マ
グネシウムの反応促進材として重過リン酸石灰、重焼リ
ンや熔リン等のリン酸塩を酸化マグネシウム100重量
部に対して1〜30重量部添加するものである。(請求
項4)
Further, the heavy metal elution-suppressing solidifying material is used as a reaction promoting agent for magnesium oxide, such as lime heavy superphosphate, heavy baking phosphorus and molten phosphorus, for the purpose of improving strength development at an early age. 1 to 30 parts by weight of phosphate is added to 100 parts by weight of magnesium oxide. (Claim 4)
【0009】さらに、当該重金属溶出抑制固化材は、ス
ラリー状(懸濁液状態)での使用を可能にすることを目
的に、各種遅延材(酒石酸、クエン酸等のカルボキシル
基を有するもの等)を酸化マグネシウム100重量部に
対して0.1〜10重量部添加するものである。(請求
項5)
Further, the heavy metal elution suppressing solidifying material is used for the purpose of enabling use in a slurry state (suspension state), and various retarding materials (such as those having a carboxyl group such as tartaric acid and citric acid). 0.1 to 10 parts by weight is added to 100 parts by weight of magnesium oxide. (Claim 5)
【0010】さらに、これらの重金属溶出抑制固化材
を、重金属で汚染された対象物に粉体もしくはスラリー
状で添加・混合することにより重金属の不溶化を施すと
ともに固化強度の発現性を付与するものである。(請求
項6)
Further, by adding and mixing these heavy metal elution suppressing solidifying materials in the form of powder or slurry to an object contaminated with heavy metals, the heavy metals are insolubilized and the solidifying strength is exhibited. is there. (Claim 6)
【0011】[0011]
【発明の実施の形態】通常、ポルトランドセメント系の
材料を使用した場合、その構成鉱物であるC 3Sおよび
2S等が水和反応することによってCa(OH)2が生
成しpHが上昇する。これに対して、本発明の重金属溶
出抑制固化材はpHの上昇を抑制するために、 Ca(OH)2を生成せず、OHイオンの生成の少な
い材料を使用する。 生成したOHイオンを何らかの方法で消費し、その発
生を抑制する。 すなわち、酸化マグネシウムを主体とした材料とするこ
とでCa(OH)2を生成せず、OHイオンの生成を少
なくし、生成したOHイオンもその反応の中で消費する
ものである。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
When a material is used, its constituent mineral is C 3S and
C2Ca (OH) due to hydration reaction of S etc.2Raw
And the pH rises. On the other hand, the heavy metal solution of the present invention
In order to suppress the rise in pH, the solidification suppressor Ca (OH)2Is not generated, and the generation of OH ions is small.
Use the wrong material. The generated OH ion is consumed in some way,
Suppress life. That is, a material mainly composed of magnesium oxide should be used.
And Ca (OH)2Generated less OH ions
Lost and the generated OH ions are also consumed in the reaction
It is a thing.
【0012】なお、本発明の重金属溶出抑制固化材の処
理対象は、重金属を含む廃液、重金属で汚染された土
壌、ゴミ焼却灰や下水汚泥焼却灰のように重金属を含ん
だ各種の有害廃棄物等、不溶化処理を必要とする重金属
で汚染された様々な対象物に使用することができ、さら
には鉛や亜鉛等に代表される両性金属に汚染された対象
物にも使用することが可能である。また、本発明の重金
属溶出抑制固化材の使用にあたっては、処理対象物に粉
体もしくは加水したスラリー状態で混合し該当重金属を
不溶化処理し、併せて固化処理を行うものである。
The heavy metal elution-suppressing solidifying material of the present invention is applied to waste liquid containing heavy metals, soil contaminated with heavy metals, various hazardous wastes containing heavy metals such as refuse incineration ash and sewage sludge incineration ash. It can be used for various objects that are contaminated with heavy metals that require insolubilization, and can also be used for objects that are contaminated with amphoteric metals such as lead and zinc. is there. When the solidifying material for suppressing heavy metal elution according to the present invention is used, it is mixed with the object to be treated in the form of powder or hydrated slurry to insolubilize the heavy metal in question and also to perform the solidifying treatment.
【0013】[0013]
【実施例】本発明の実施例を示す。なお、実施例は本発
明の範囲を限定するものではない。 (1)重金属溶出抑制 表1に示した材料に表2の各種重金属溶液を、水/粉体
比0.5(重量比)で混合し、ポリ袋に入れ密封状態に
した試料を温度20℃、湿度80%以上の恒温・恒湿室
にて材齢3日まで湿空養生を行った。養生後の試料を環
境庁告示第46号法に従い溶出試験を行った。なお、溶
出検液については、各重金属の溶出量以外に、ガラス電
極式のpHメーターを用いてpHの測定も行った。
EXAMPLES Examples of the present invention will be shown. The examples do not limit the scope of the present invention. (1) Suppression of heavy metal elution Various heavy metal solutions of Table 2 were mixed with the materials shown in Table 1 at a water / powder ratio of 0.5 (weight ratio), and the sample was sealed in a plastic bag at a temperature of 20 ° C. The material was aged in a constant temperature / humidity room with a humidity of 80% or more until the material was aged for 3 days. The cured sample was subjected to a dissolution test according to the Environmental Agency Notification No. 46 method. Regarding the elution test solution, pH was measured using a glass electrode type pH meter in addition to the elution amount of each heavy metal.
【0014】[0014]
【表1】 [Table 1]
【0015】[0015]
【表2】 [Table 2]
【0016】[0016]
【表3】 [Table 3]
【0017】表3で示したように、本発明品による重金
属の不溶化効果は普通ポルトランドセメントのそれと同
等以上であり、特に六価クロム、鉛及び水銀については
その能力が高いことが分かった。
As shown in Table 3, it was found that the insolubilizing effect of the heavy metal by the product of the present invention is equal to or higher than that of ordinary Portland cement, and particularly the ability of hexavalent chromium, lead and mercury is high.
【0018】(2)強度発現性 表4に示すそれぞれの対象土400cm3に、表5に示
す本発明品および普通ポルトランドセメントを、粉体で
200kg/m3の割合で添加、ハンドミキサーにて混合し
た。混合後の試料をφ3.5×h7cmのアクリル製の型枠に
て強度試験用の供試体を作成し、材齢7日、28日にて地
盤工学会基準に準拠して一軸圧縮試験を行った。
(2) Strength development property To each target soil 400 cm 3 shown in Table 4, the product of the present invention and ordinary Portland cement shown in Table 5 were added as powder at a rate of 200 kg / m 3 , and they were mixed with a hand mixer. Mixed. The mixed sample is made into a specimen for strength test with a φ3.5 × h7cm acrylic formwork, and a uniaxial compression test is carried out on the 7th and 28th days of age in accordance with the Geotechnical Society Standards. It was
【0019】[0019]
【表4】 [Table 4]
【0020】[0020]
【表5】 [Table 5]
【0021】[0021]
【表6】 [Table 6]
【0022】表6に示したように、本発明品は実用上、
十分な固化強度を発現していた。
As shown in Table 6, the product of the present invention is practically
It exhibited a sufficient solidification strength.
【0023】[0023]
【発明の効果】以上のように、本発明の重金属溶出抑制
固化材は、重金属を不溶化するだけでなく鉛等の両性金
属も不溶化可能であり、且つ実用上十分な固化強度を発
現する。
As described above, the solidifying material for suppressing heavy metal elution according to the present invention can not only insolubilize heavy metals but also insolubilize amphoteric metals such as lead, and exhibits practically sufficient solidifying strength.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) C09K 3/00 (72)発明者 大森 啓至 千葉県佐倉市大作二丁目4番2号 太平洋 セメント株式会社中央研究所内 Fターム(参考) 4D004 AA36 AA41 AB03 CA45 CC06 CC20 DA03 DA10 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) C09K 3/00 (72) Inventor Keiji Omori 2-4 Daisaku, Sakura-shi, Chiba Taiheiyo Cement Co., Ltd. Central Research Institute F-term (reference) 4D004 AA36 AA41 AB03 CA45 CC06 CC20 DA03 DA10

Claims (6)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 酸化マグネシウムを含んで成ることを特
    徴とする重金属溶出抑制固化材。
    1. A solidification material for suppressing elution of heavy metals, which comprises magnesium oxide.
  2. 【請求項2】 酸化マグネシウム100重量部に対し
    て、セッコウを1〜50重量部添加する請求項1に記載
    の重金属溶出抑制固化材。
    2. The solidification inhibitor for heavy metal elution according to claim 1, wherein 1 to 50 parts by weight of gypsum is added to 100 parts by weight of magnesium oxide.
  3. 【請求項3】 酸化マグネシウム100重量部に対し
    て、反応促進材を0.5〜30重量部添加する請求項1
    または2に記載の重金属溶出抑制固化材。
    3. A reaction accelerator is added in an amount of 0.5 to 30 parts by weight with respect to 100 parts by weight of magnesium oxide.
    Alternatively, the heavy metal elution suppressing solidifying material according to 2.
  4. 【請求項4】 酸化マグネシウム100重量部に対し
    て、リン酸塩1〜30重量部添加する請求項1〜3のい
    ずれかに記載の重金属溶出抑制固化材。
    4. The heavy metal elution suppressive solidifying material according to claim 1, wherein 1 to 30 parts by weight of a phosphate is added to 100 parts by weight of magnesium oxide.
  5. 【請求項5】 酸化マグネシウム100重量部に対し
    て、凝結遅延剤を0.1〜10重量部添加する請求項1
    〜4のいずれかに記載の重金属溶出抑制固化材。
    5. A setting retarder is added in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of magnesium oxide.
    The heavy metal elution suppressive solidifying material according to any one of to 4.
  6. 【請求項6】 請求項1〜5のいずれかに記載の重金属
    溶出抑制固化材を、重金属で汚染された対象物に粉体も
    しくはスラリー状で添加・混合することを特徴とする重
    金属溶出抑制および固化処理方法。
    6. A heavy metal elution suppression solidifying material according to any one of claims 1 to 5, which is added to and mixed with an object contaminated with heavy metal in the form of powder or slurry, and Solidification treatment method.
JP2001311630A 2001-10-09 2001-10-09 Solidifying material and solidifying method for suppressing elution of heavy metal Pending JP2003117532A (en)

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JP2003334526A (en) * 2002-05-21 2003-11-25 Konoike Constr Ltd Method for solidifying and insolubilizing polluted soil, or the like
JP2004337677A (en) * 2003-05-13 2004-12-02 Ube Ind Ltd Method of producing heavy metal elution suppression material
JP2005007256A (en) * 2003-06-18 2005-01-13 Matsuda Giken Kogyo Kk Contaminated soil insolubilization solidification agent
JP2005113065A (en) * 2003-10-10 2005-04-28 Kajima Corp Consolidating agent for ground improvement and ground improvement method of construction
JP2006297285A (en) * 2005-04-20 2006-11-02 Ube Ind Ltd Low alkali hardner for water-containing soil and hardening treatment method
JP2008155101A (en) * 2006-12-22 2008-07-10 Taiheiyo Cement Corp Elution restraining material of hexavalent chromium
JP2009013427A (en) * 2001-11-30 2009-01-22 Matsuda Giken Kogyo Kk Agent for solidifying and insolubilizing soil and soil treating method
WO2010052986A1 (en) * 2008-11-07 2010-05-14 太平洋セメント株式会社 Insolubilizing agent
JP4481360B1 (en) * 2009-10-05 2010-06-16 太平洋セメント株式会社 Insolubilizing material
JP2010131517A (en) * 2008-12-04 2010-06-17 Taiheiyo Cement Corp Insolubilizing agent
JP2012254433A (en) * 2011-06-10 2012-12-27 Oji Holdings Corp Method for treating incineration ash containing fluorine and heavy metals
WO2014068796A1 (en) * 2012-11-02 2014-05-08 株式会社フジコーポレーション System for manufacturing embankment material, and method for manufacturing embankment material
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