JP3706618B2 - Solidification / insolubilizer and solidification / insolubilization method for soil, incineration ash, coal ash, and gypsum board waste - Google Patents

Description

【００３６】
水分を含んだ土壌に、軽焼マグネサイト又は軽焼ブルーサイトと、軽焼ドロマイトを混練させると、これらの鉱石中の酸化マグネシウム（ＭｇＯ）が前記式（１）及び式（２）の反応を起こすと考えられ、強度の高い固化物を形成する。
【００３７】
このとき、並行して、軽焼ドロマイトの主成分であるＣａＯが土壌中の水分と反応して水酸化カルシウムＣａ（ＯＨ）₂ を生成し、電離したＣａイオンが粘土粒子表面の帯電を中和し、粘土粒子を固化する（ポラゾン反応）と考えられる。また、軽焼ドロマイトは、土壌と混合し水と接触することで水和反応が進行し、土壌中の硫酸イオンと反応し、速やかにエトリンガイド（３ＣａＯ・Ａｌ₂ Ｏ₃ ・３ＣａＳＯ₄ ・３２Ｈ₂ Ｏ）を生成し、その針状結晶が粘土粒子を架橋すると考えられ、前記軽焼マグネシウムの反応による強度の高い固化物の形成と相まって、高強度の固化物が得られる。
【００３８】
これらの反応に加えて、固化・不溶化剤の成分が被処理物中に含まれる、無機性炭酸化合物、水溶性有機物、珪酸塩、鉄塩、原油の主生物である炭素と水素から出来た炭化水素等の種々の成分と反応するため、様々な土壌中の成分と固化物を形成し、溶出しない高強度のものとなると考えられる。
【００３９】
これらの反応に加えて、固化・不溶化剤の成分中に含まれる、ガラス粉末、カキ殻粉末は、固化物にさらに強度を付加する。即ち、ガラス中に含まれるシリカ（ＳｉＯ₂ ）や、カキ殻粉末中に含まれるカルシウムは、固化物となる成分系におけるカルシウムイオン、シリカ（ＳｉＯ₂ ）及び／又はアルミニウムと反応することで、カルシウムシリケート水和物やカルシウムアルミネート水和物等を生成して、土壌粒子を固化し、強度発現を増進させる。なお、本発明の固化・不溶化剤において、ガラス粉末の一部又は全部をカキ殻粉末に置き換えて使用することができる。
【００４０】
さらにこのとき、熔成燐肥等の添加によりリン酸が存在している場合、次式（３）に示す反応によりリン酸マグネシウムが生成すると考えられる。
【００４１】
【化２】

【００４２】
熔成燐肥中の酸化マグネシウム及び酸化カルシウムがダイオキシン類の有機塩素と反応し、塩化マグネシウム及び塩化カルシウムとなり、無害の化合物を生成を促進する。
【００４３】
一般的な軽焼マグネサイトの成分分析値（重量％）の１例を示す。
ＭｇＯ ９０．７９％
ＣａＯ ２．５８％
ＳｉＯ₂ １．９９％
Ｆｅ₂ Ｏ₃ ０．６３％
Ａｌ₂ Ｏ₃ ０．２１％
灰分 残余
【００４４】
一般的な軽焼ドロマイトの成分分析値（重量％）の１例を示す。
ＳｉＯ₂ １．７０４％
Ｆｅ₂ Ｏ₃ ０．４７１％
Ａｌ₂ Ｏ₃ ０．１６３％
ＣａＯ ５６．３８％
ＭｇＯ ３９．２７％
Ｐ₂ Ｏ₅ ０．０１８％
灰分 残余
【００４５】
一般的な軽焼ブルーサイトの成分分析値（重量％）の１例を示す。
ＭｇＯ ９１．１５％
ＣａＯ ３．１７％
ＳｉＯ₂ １．４０％
Ｆｅ₂ Ｏ₃ ０．８８％
Ａｌ₂ Ｏ₃ ３．１７％
灰分 残余
【００４６】
一般的なガラス粉末（発砲ガラスビーズ用原料）の成分分析値（重量％）の１例を示す。
ＳｉＯ₂ ７８．１６％
Ａｌ₂ Ｏ₃ ４．２６％
Ｆｅ₂ Ｏ₃ ０．７７％
ＴｉＯ₂ ０．３０％
ＣａＯ ９．３６％
ＭｇＯ １．７３％
Ｋ₂ Ｏ ０．５２％
Ｎａ₂ Ｏ ４．３３％
【００４７】
一般的な２０．０熔成燐肥の成分分析値（重量％）の１例を示す。
苦溶性リン酸 ２０％
酸化カルシウム ３５．８５％
酸化マグネウシム ２０％
苦溶性苦土 １５％
可溶性珪酸 ２０％
【００４８】
【発明の実施の形態】
各種被処理物の処理の好ましい実施の形態の例を示すが、本発明は以下の例に限定されない。
【００４９】
無機性汚泥（下水汚泥）の固化・不溶化処理（再生砕砂を得る場合）
下水汚泥を含水率８５％程度に水分量を調整したもの１００重量部に、軽焼ブルーサイト又は軽焼マグネサイトに対するガラス粉末又はかき殻粉末の重量比が１：０．０１〜０．６からなる固化・不溶化剤を１０〜２０重量部添加し、ミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始については常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結する。更に凝結物を放置しておくと３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級機等により、路床材（５ｍｍアンダー細骨材）等の製品を作ることができる。
【００５０】
無機性汚泥（下水汚泥）の固化・不溶化処理（再生砕石を得る場合）
下水汚泥を含水率８５％程度に水分量を調整したもの１００重量部に、次の固化不溶化剤を１０〜２０重量部混合する。即ち、固化不溶化剤には、軽焼マグネサイト及び／又は軽焼ブルーサイトと、軽焼ドロマイトとの重量比が、１：５〜５：１であり、この混合物１００重量部に対しさらにガラス粉末及び／またはカキ殻粉末を１〜６０重量部を混合した混合物を用いる。
【００５１】
下水汚泥と固化不溶化剤はミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始については常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結する。更に凝結物を放置しておくと３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級機等により、路盤材（ＲＣ−４０）を作ることができる。
【００５２】
無機性土壌として建設系汚泥（ベントナイト等を含有する土壌も含む）の固化・不溶化処理
建設現場で発生した汚泥を含水率８５％程度に水分量を調整したもの１００重量部に、軽焼マグネサイト（又は軽焼ブルーサイト）及び軽焼ドロマイト（重量比１：５〜５：１）（主剤成分と呼ぶ）と、ガラス粉末（主剤成分１００重量部に対し１〜６０重量部）を基本成分にして含む固化・不溶化剤を１０〜２０重量部添加し、ミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始については常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結する。更に凝結物を放置しておくと３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級機等により、路盤材（ＲＣ−４０）、路床材（５ｍｍアンダー細骨材）等の製品を作ることができる。
【００５３】
無機性土壌として浚渫系汚泥の固化・不溶化処理
浚渫により発生した汚泥を含水率８５％程度に水分量を調整したもの１００重量部に、軽焼マグネサイト（又は軽焼ブルーサイト）及び軽焼ドロマイト（重量比１：５〜５：１）（主剤成分と呼ぶ）と、ガラス粉末（主剤成分１００重量部に対し１〜６０重量部）を基本成分にして含む固化・不溶化剤を１０〜３０重量部（河川浚渫系汚泥に対しては１０〜３０重量部、港湾浚渫系塩分含有汚泥に対しては１０〜１５重量％）添加し、ミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始については常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結する。更に凝結物を放置しておくと３〜６日後に高強度の耐久性のある粒状の固化物が得られる。３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級機械等により路盤材（ＲＣ−４０）、路床材（５ｍｍアンダー細骨材）等の製品を作ることができる。
【００５４】
無機性土壌として浄水発生汚泥（高分子凝縮剤含む）の固化・不溶化処理
浄水発生汚泥を含水率８５％程度に水分量を調整したもの１００重量部に、軽焼マグネサイト（又は軽焼ブルーサイト）及び軽焼ドロマイト（重量比が１：５〜５：１）（主剤成分と呼ぶ）と、ガラス粉末（主剤成分１００重量部に対し１〜６０重量部）を基本成分にした固化・ 不溶化剤を１０〜２０重量部添加し、ミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始については常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結する。更に凝結物を放置しておくと３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級機械等により路盤材（ＲＣ−４０）、路床材（５ｍｍアンダー細骨材）等の製品を作ることができる。
【００５５】
無機性土壌として砕石粉末土砂（高分子凝集剤を含む）の固化・不溶化処理
高分子凝集剤を含む砕石粉末土砂を含水率８５％程度に水分量を調整したもの１００重量部に、軽焼マグネサイト（又は軽焼ブルーサイト）及び軽焼ドロマイト（重量比が１：５〜５：１）（主剤成分と呼ぶ）と、ガラス粉末（主剤成分１００重量部に対し１〜６０重量部）を基本成分にした固化・ 不溶化剤を１０〜２０重量部添加し、ミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始については常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結する。更に凝結物を放置しておくと３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級機等により路盤材（ＲＣ−４０）、路床材（５ｍｍアンダー細骨材）等の製品を作ることができる。
【００５６】
有機性土壌として食品加工による有機性食物油を５％以上含んだ有機性汚泥等の固化・不溶化処理
有機性食物油を１０重量％を含んだ汚泥を含水率８５％程度に水分量を調整したもの１００重量部に、軽焼マグネサイト（又は軽焼ブルーサイト）及び軽焼ドロマイト（重量比が１：５〜５：１）（主剤成分と呼ぶ）と、ガラス粉末（主剤成分１００重量部に対し１〜６０重量部）を基本成分にした固化・ 不溶化剤を１０〜２０重量部添加し、ミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始については常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結する。更に凝結物を放置しておくと３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級機等により路盤材（ＲＣ−４０）路床材（５ｍｍアンダー細骨材）等の製品を作ることができる。
【００５７】
なお、有機性食物油を５％未満含む有機性汚泥の場合には、軽焼ドロマイトの量を減じることができ、また、ガラス粉末及び／またはカキ殻粉末の使用を省略することができる。
る。
【００５８】
鉱物油汚染土壌（鉱物油５重量％以上含有する土壌）の固化・不溶化処理
鉱物油１０重量％含有する汚染土壌を含水率８５％程度に水分量を調整したもの１００重量部に、軽焼マグネサイト（又は軽焼ブルーサイト）及び軽焼ドロマイト（重量比が１：５〜５：１）（主剤成分と呼ぶ）と、ガラス粉末（主剤成分１００重量部に対し１〜６０重量部）を基本成分にした固化・ 不溶化剤を１０〜２０重量部添加し、ミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始については常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結する。更に凝結物を放置しておくと３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級機械等により路盤材（ＲＣ−４０）、路床材（５ｍｍアンダー細骨材）等の製品を作ることができる。また、現場に埋め戻すことも可能である。
【００５９】
なお、鉱物油有機性食物油を５重量％未満含む有機性汚泥の場合には、軽焼ドロマイトの量を減じることができ、また、ガラス粉末及び／またはカキ殻粉末の使用を省略することができる。
【００６０】
油汚染土壌（油５重量％未満含有する土壌）の固化・不溶化処理
有機性植物油或いは鉱物油を５％未満含む油汚染土壌を含水率８５％程度に水分量を調整したもの１００重量部に、軽焼マグネサイト（又は軽焼ブルーサイト）及び軽焼ドロマイト（重量比が１：５〜５：１）からなる固化・不溶化剤を１０〜２０重量部添加し、ミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始については常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結する。更に凝結物を放置しておくと３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級機械等により路床材（５ｍｍアンダー細骨材）等の製品を作ることができる。また、現場に埋め戻度すことも可能である。
【００６１】
ダイオキシン類含有焼却灰の固化・不溶化処理
ダイオキシン含有焼却灰を含水率８０〜９９重量％に調整し、次の組成の固化・不溶化剤を、該被処理物の乾燥物１ｍ³ 当たり５０〜２００ｋｇ混合する。ダイオキシン含有焼却灰に適用する固化・不溶化剤の組成は、軽焼マグネサイト及び／又は軽焼ブルーサイトと、軽焼ドロマイトと、ガラス粉末及び／またはカキ殻粉末と、熔成燐肥とを含み、軽焼マグネサイト（又は軽焼ブルーサイト）及び軽焼ドロマイト（重量比が１：５〜５：１）（主剤成分と呼ぶ）と、ガラス粉末（主剤成分１００重量部に対し１〜６０重量部）と、前記各成分の合計１００重量部に対し、熔成燐肥が６０〜１００重量部である。該熔成燐肥には２０．０熔成燐肥を用いることが好ましい。
【００６２】
次いで、混合物をミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始については常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結する。更に凝結物を放置しておくと３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級機等により路盤材（ＲＣ−４０）、路床材（５ｍｍアンダー細骨材）等の製品を作ることができる。
【００６３】
石炭灰の固化・不溶化処理
石炭灰を含水率８０〜９９重量％に調整し、次の組成の固化・不溶化剤を、該被処理物の乾燥物１ｍ³ 当たり５０〜２００ｋｇ混合する。石炭灰に適用する固化・不溶化剤の組成は、軽焼マグネサイト（又は軽焼ブルーサイト）及び軽焼ドロマイト（重量比が１：５〜５：１）（主剤成分と呼ぶ）と、ガラス粉末（主剤成分１００重量部に対し１〜６０重量部）を基本成分にし、該基本成分（１００重量部）にさらに２０．０熔成燐肥（１〜１００重量部）を添加したものである。次いで、ミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始については常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結する。更に凝結物を放置しておくと３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級機等により路盤材（ＲＣ−４０）、路床材（５ｍｍアンダー細骨材）等の製品を作ることができる。
【００６４】
強酸性土壌として温泉土壌の固化・不溶化処理
硫黄分を含む強酸性を示す温泉土壌を含水率８５％程度に水分量を調整したもの１００重量部に、軽焼マグネサイト（又は軽焼ブルーサイト）及び軽焼ドロマイト（重量比が１：５〜５：１）（主剤成分と呼ぶ）と、ガラス粉末（主剤成分１００重量部に対し１〜６０重量部）を基本成分にし、該基本成分（１００重量部）にさらに２０．０熔成燐肥（１〜１００重量部）を添加してなる固化・不溶化剤１０〜３０重量部添加し、ミキサーにて混練を２〜３分間行うことにより、スラリーを得る。直ちに、スラリーをミキサーより排出して、平坦面上に放置する。水和反応による固化開始が常温（２０℃の時）で３０〜１８０分位で終結する。更に、３〜６日後に高強度の耐久性のある粒状の固化物が得られる。これを分級等により路盤材（ＲＣ−４０）、路床材（５ｍｍアンダー細骨材）等の製品を作ることができる。
【００６５】
【実施例】
［実施例１］
建設系汚泥の固化・不溶化処理
建設現場から排出された汚泥を含水率８５％程度に水分量を調整したもの１０００ｋｇに、軽焼マグネサイト（４０重量％）（ソブエクレー株式会社製）、軽焼ドロマイト（３０重量％）（ソブエクレー株式会社製）、ガラス粉末（３０重量％）（ビンガラス粉末、ソブエクレー株式会社製）からなる固化・不溶化剤を１５０ｋｇ添加し、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃）で１８０分位で凝結を終結した。更に凝結物を放置しておき、３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により分級して、路盤材（ＲＣ−４０）及び路床材（５ｍｍアンダー細骨材）を得た。
【００６６】
建設現場から排出された汚泥の固化・不溶化処理前と処理後のカドミウム、鉛、砒素についての濃度変化を下記の表１に示す。
【００６７】
【表１】

【００６８】
［実施例２］
河川浚渫系汚泥の固化・不溶化処理
河川浚渫系汚泥を含水率８５％程度に水分量を調整したもの１０００ｋｇに、軽焼マグネサイト（４０重量％）（ソブエクレー株式会社製）、軽焼ドロマイト（３０重量％）（ソブエクレー株式会社製）、ガラス粉末（３０重量％）（ソブエクレー株式会社製）からなる固化・不溶化剤を２００ｋｇ添加し、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃）で１８０分位で凝結を終結した。更に凝結物を放置しておき、３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により分級して、路盤材（ＲＣ−４０）及び路床材（５ｍｍアンダー細骨材）を得た。
【００６９】
［実施例３］
高分子凝縮剤含む浄水発生汚泥の固化・不溶化処理
高分子凝縮剤含む浄水発生汚泥を含水率８５％程度に水分量を調整したもの５０ｋｇに、軽焼マグネサイト（４０重量％）（ソブエクレー株式会社製）、軽焼ドロマイト（３０重量％）（ソブエクレー株式会社製）、ガラス粉末（３０重量％）（ソブエクレー株式会社製）からなる固化・不溶化剤を１０ｋｇ添加し、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃）で１８０分位で凝結を終結した。更に凝結物を放置しておき、３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により分級して、路盤材（ＲＣ−４０）及び路床材（５ｍｍアンダー細骨材）を得た。
【００７０】
［実施例４］
高分子凝集剤を含む砕石粉末土砂の固化・不溶化処理
高分子凝集剤を含む砕石粉末土砂を含水率８５％程度に水分量を調整したもの５０ｋｇに、軽焼マグネサイト（４０重量％）（ソブエクレー株式会社製）、軽焼ドロマイト（３０重量％）（ソブエクレー株式会社製）、ガラス粉末（３０重量％）（ソブエクレー株式会社製）からなる固化・不溶化剤を１０ｋｇ添加し、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃）で１８０分位で凝結を終結した。更に凝結物を放置しておき、３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により分級して、路盤材（ＲＣ−４０）及び路床材（５ｍｍアンダー細骨材）を得た。
【００７１】
［実施例５］
食物油１０％含有有機性汚泥等の固化・不溶化処理
食物油を１０重量％含んだ汚泥を含水率８５％程度に水分量を調整したもの５０ｋｇに、軽焼マグネサイト（４０重量％）（ソブエクレー株式会社製）、軽焼ドロマイト（３０重量％）（ソブエクレー株式会社製）、ガラス粉末（３０重量％）（ソブエクレー株式会社製）からなる固化・不溶化剤を１０ｋｇ添加し、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃）で１８０分位で凝結を終結した。更に凝結物を放置しておき、３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により分級して、路床材（５ｍｍアンダー細骨材）を得た。
【００７２】
［実施例６］
鉱物油１０重量％含有する油汚染土壌の固化・不溶化処理
鉱物油１０重量％含有する汚染土壌を含水率８５％程度に水分量を調整したもの５０ｋｇに、軽焼マグネサイト（４０重量％）（ソブエクレー株式会社製）、軽焼ドロマイト（３０重量％）（ソブエクレー株式会社製）、ガラス粉末（３０重量％）（ソブエクレー株式会社製）からなる固化・不溶化剤を１０ｋｇ添加し、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃）で１８０分位で凝結を終結した。更に凝結物を放置しておき、３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により分級して、路床材（５ｍｍアンダー細骨材）を得た。
【００７３】
［実施例７］
鉱物系油汚染土壌（鉱物系油１重量％含有する土壌）の固化・不溶化処理
鉱物系油１重量％（１００００ｍｇ／ｌ）含む油汚染土壌を含水率８５％程度に水分量を調整したもの５０Ｋｇに、軽焼マグネサイト（ソブエクレー株式会社製）５０重量％及び軽焼ドロマイト（ソブエクレー株式会社製）５０重量％を基本成分とした固化・不溶化剤を１０ｋｇ添加し、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結した。更に凝結物を放置しておき、３日後に高強度の耐久性のある粒状の固化物が得られた。得られた粒状の固化物の鉱物系油の含有量を測定したところ、１３ｍｇ／ｌであった。この値は環境庁作成の昭和５１年環告第３号の環境基準を満たしている。
【００７４】
得られた粒状の固形物を分級機により分級して路床材（５ｍｍアンダー細骨材）を得た。
【００７５】
［実施例８］
ダイオキシン含有焼却灰と飛灰の混合灰の固化・不溶化処理
ダイオキシン類化合物（ダイオキシン、ジベンゾフラン）とコプラナーＰＣＢｓを含有する焼却灰と飛灰の混合灰を含水率８５％程度に水分量を調整したものに、以下の組成の固化・不溶化剤４０ｋｇを混合灰の乾燥物０．２ｍ³ 当たり混合した。
【００７６】
（固化・不溶化剤の組成）
軽焼マグネサイト（ソブエクレー株式会社製） ２０重量％
軽焼ドロマイト（ソブエクレー株式会社製） ２０重量％
ガラス粉末（ソブエクレー株式会社製） １０重量％
２０．０熔成燐肥（東北東ソー化学株式会社製） ５０重量％
【００７７】
次いで、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結した。更に凝結物を放置しておくと３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により路盤材（ＲＣ−４０）及び路床材（５ｍｍアンダー細骨材）を得た。
【００７８】
固化・不溶化処理前と処理後のダイオキシン類（ダイオキシン、ジベンゾフラン）とコプラナーＰＣＢｓ合計濃度と、ダイオキシン類（ダイオキシン、ジベンゾフラン）とコプラナーＰＣＢｓ合計の毒性等価濃度（ＴＥＱ）の変化を下記の表２に示す。
【００７９】
【表２】

【００８０】
［実施例９］
石炭灰の固化・不溶化処理
石炭灰を含水率８５％程度に水分量を調整したものに、以下の組成の固化・不溶化剤１０ｋｇを石炭灰の乾燥物０．０５ｍ³ 当たり混合した。
【００８１】
軽焼マグネサイト（ソブエクレー株式会社製） ２０重量％
軽焼ドロマイト（ソブエクレー株式会社製） ３０重量％
ガラス粉末（ソブエクレー株式会社製） ２０重量％
２０．０熔成燐肥（東北東ソー化学株式会社製） ３０重量％
【００８２】
次いで、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結した。更に凝結物を放置しておくと３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により分級して、路盤材（ＲＣ−４０）を得た。路盤材について、ＪＩＳ Ａ １２１０による締固め最大乾燥密度は１．１８６ｇ／ｃｍ、ＪＩＳ Ａ １２１１による締固め度（９５％乾燥密度）は１．１２６、締固め度（９５％ＣＢＲ値）は８３．９％であり、プラント再生塗装技術指針による締固め度（９５％ＣＢＲ値）の規格値３０％以上を十分に満たしていた。
【００８３】
［実施例１０］
強酸性土壌として温泉土壌の固化・不溶化処理
強酸性を示す温泉土壌５０ｋｇを含水率８５％程度に水分量を調整し、以下の組成の固化・不溶化剤１０ｋｇ混合した。
【００８４】
（固化・不溶化剤の組成）
軽焼マグネサイト（ソブエクレー株式会社製） ３０重量％
軽焼ドロマイト（ソブエクレー株式会社製） ３０重量％
ガラス粉末（ソブエクレー株式会社製） ２０重量％
２０．０熔成燐肥（東北東ソー化学株式会社製） ２０重量％
【００８５】
次いで、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結した。更に凝結物を放置しておくと３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により路盤材（ＲＣ−４０）及び路床材（５ｍｍアンダー細骨材）を得た。
【００８６】
［実施例１１］
下水汚泥（焼却灰）の固化・不溶化処理
下水汚泥（焼却灰）５０ｋｇを含水率８５％程度に水分量を調整し、以下の組成の固化・不溶化剤１０ｋｇ混合した。
【００８７】
（固化・不溶化剤の組成）
軽焼ブルーサイト ３０重量％
軽焼ドロマイト（ソブエクレー株式会社製） ３０重量％
カキ殻粉末（カキ殻粉末石灰：商品名、平塚商店製） ２０重量％
【００８８】
次いで、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結した。更に凝結物を放置しておくと３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により路盤材（ＲＣ−４０）及び路床材（５ｍｍアンダー細骨材）を得た。
【００８９】
［実施例１２］
下水汚泥（脱水汚泥）の固化・不溶化処理
下水汚泥（脱水汚泥）５０ｋｇを含水率８５％程度に水分量を調整し、以下の組成の固化・不溶化剤１０ｋｇ混合した。
【００９０】
（固化・不溶化剤の組成）
軽焼ブルーサイト ９０重量％
カキ殻粉末（カキ殻粉末石灰：商品名、平塚商店製） １０重量％
【００９１】
次いで、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結した。更に凝結物を放置しておくと３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により路床材（５ｍｍアンダー細骨材）を得た。
【００９２】
［実施例１３］
下水汚泥（脱水汚泥）の固化・不溶化処理
下水汚泥（脱水汚泥）５０ｋｇを含水率８５％程度に水分量を調整し、以下の組成の固化・不溶化剤１０ｋｇ混合した。
【００９３】
（固化・不溶化剤の組成）
軽焼ブルーサイト ９０重量％
ガラス粉末（ソブエクレー株式会社製） １０重量％
【００９４】
次いで、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結した。更に凝結物を放置しておくと３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により路床材（５ｍｍアンダー細骨材）を得た。
【００９５】
［実施例１４］
重金属含有焼却灰と飛灰の混合灰の固化・不溶化処理
カドミウム、鉛、六価クロム、水銀等の重金属を含有する焼却灰と飛灰の混合灰を含水率８５％程度に水分量を調整したものに、以下の組成の固化・不溶化剤４０ｋｇを混合灰の乾燥物０．２ｍ³ 当たり混合した。
【００９６】
（固化・不溶化剤の組成）
軽焼マグネサイト（ソブエクレー株式会社製） ２０重量％
軽焼ドロマイト（ソブエクレー株式会社製） ２０重量％
ガラス粉末（ソブエクレー株式会社製） １０重量％
２０．０熔成燐肥（東北東ソー化学株式会社製） ５０重量％
【００９７】
次いで、ミキサーにて混練を３分間行うことにより、スラリーを得た。直ちに、スラリーをミキサーより排出して、平坦面上に放置した。常温（約２０℃の時）で３０分位から凝結を開始し１８０分位で終結した。更に凝結物を放置しておくと３日後に高強度の耐久性のある粒状の固化物が得られた。これを分級機により路盤材（ＲＣ−４０）及び路床材（５ｍｍアンダー細骨材）を得た。
【００９８】
固化・不溶化処理前と処理後の重金属類の溶出試験について、環境庁告示第４６号の溶出方法で試料溶液を調製し、計量の対象としてカドミウム、シナン、鉛、六価クロム、ヒ素に関してＪＩＳ Ｋ ０１０２にて、有機リンに関して昭和４９年環境庁告示６４号付表１にて、及び水銀に関して昭和４６年環境庁告示５９号付表１の計量方法による結果を下記の表３に示す。
【００９９】
【表３】

【０１００】
表３によれば、本発明の固化・不溶化方法により重金属類の溶出が抑制されることが分かる。
【０１０１】
また、昭和４６年環水管第１２７号「土質調査方法」による固化・不溶化処理前と処理後の重金属類の含有量に関する計量についての結果を下記の表４に示す。
【０１０２】
【表４】

【０１０３】
表４によれば、不溶化処理後には昭和４６年環水管第１２７号「土質調査方法」による計量では、鉛、ヒ素、ホウ素の計量値が低い値となっていることが分かる。
【０１０４】
【発明の効果】
本発明の固化・不溶化剤及び固化・不溶化方法によれば、得られた固化物は非常に固く、環境庁告示第４６号の環境基準を満たす程度に無害化されている。また、該固化物のＰＨ値は１０．０前後と低く、アルカリ公害に対する負荷も少ない。
【０１０５】
本発明の固化・不溶化剤を適用して得られた固化物は、３〜６日で高強度の耐久性のある粒状の固化物となる。該固化物は粗骨材の比重及び吸水試験（ＪＩＳＡ １１１０）での絶乾比重が、２．５０ｇ／ｃｍ³ 、ロサンゼル試験機による粗骨材のすりへり試験（ＪＩＳ Ａ １１２１）における、すりへり減量（％）が規格値５０％以下に対して１４．１％並びに、ＣＢＲ試験（室内試験結果、ＪＩＳ Ａ １１２１）では、平均ＣＢＲ（％）が、１３２．１と高く、高強度であるため、ＪＩＳ Ａ５００５に定めるコンクリート用砕石、及びＪＩＳ Ａ５００４に定めるコンクリート用砕砂の物理的性質及び粒度に適合しているので、再生砕砂、再生砕石として利用でき、例えば、路盤材としてリサイクル可能となる。
【０１０６】
本発明の固化・不溶化剤を適用して得られた固化物は、組成が多孔質であり、かつ、酸化アルミニウムを含んでいるため汚濁水中に含まれる有用性微生物が酸化アルミニウムに好んで付着し、有機物を分解することから、汚濁水清淨に利用することができる。
【０１０７】
本発明の固化・不溶化剤に２０．０熔成燐肥が含まれる場合には、土壌中の油分、重金属、ダイオキシン類等が分解され、不溶化された固化物とすることができるので、公害防止に効果がある。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to inorganic or organic soil, oil-contaminated soil, strongly acidic soil (including sulfur content), heavy metal-containing contaminated soil, dioxin-contaminated soil, dioxin-containing incinerated ash (including fly ash), coal ash, etc. The present invention relates to a solidifying / insolubilizing agent capable of solidifying and insolubilizing a solidified material and preventing elution of harmful substances, and a solidifying / insolubilizing method for applying the solidifying / insolubilizing agent to the solidified material. The solidified product converted into the granular material produced by the solidification / elution method of the present invention can be used as recycled crushed stone and recycled crushed sand.
[0002]
[Prior art]
Most of the construction sludge (construction soil) generated as construction surplus soil for excavation and dredging is transported to landfills and disposed of by landfill. Of these, soils that are disposed of by law, such as soil containing heavy metals such as chromium and cadmium, and strongly acidic soils containing sulfur, which are discharged by tunnel construction, etc. are rendered harmless. Since it is difficult to do so, it is the current situation that the water-impermeable sheet is buried in the hole.
[0003]
Cement-based solidifying agents are suitable for solidifying inorganic soils (those that do not contain polymer flocculants, etc.), but have a high PH value and an alkali with a high PH14 exceeding the range of PH3.5-10 where organisms can live. Since the state lasts for a long time, there is a limit to utilizing the solidified material obtained by such a solidifying agent.
[0004]
Lime-based solidifying agents are suitable for inorganic soil as well as cement-based, but a high exothermic reaction occurs during the hydration reaction, and a large amount of dust is generated. Moreover, the obtained solidified product has a high PH value like cement, and may not have sufficient strength after solidification.
[0005]
A gypsum-based solidifying agent, unlike cement-based and lime-based, has a low PH value after solidification of the target soil and hardly causes alkali pollution, but may not have sufficient strength after solidification.
[0006]
In addition, common to these solidifying agents is that when harmful components are contained in the target soil, elution of harmful components is suppressed to a certain extent immediately after solidification, but then the soluble harmful components are gradually released from the solidified product. There is a problem that elution begins and insolubilization is not sustained over a long period of time. There is a need for an improvement of a solidifying agent that should solve such problems, and there is a need for the development of a solidifying agent that can be solidified according to the purpose in any soil and further insolubilize harmful substances.
[0007]
[Problems to be solved by the invention]
The present invention provides a solidifying / insolubilizing agent capable of obtaining a solidified product that is detoxified to an extent suitable for environmental standards with respect to soil, incinerated ash, coal ash, and gypsum board waste, and It aims at providing the manufacturing method which solidifies and insolubilizes with respect to these to-be-processed objects using an insolubilizing agent, and obtains the solidified material which can be utilized effectively.
[0008]
[Means for Solving the Problems]
There are the following four types of solidifying / insolubilizing agents of the present invention for solving the above-mentioned problems.
[0009]
The first solidifying / insolubilizing agent of the present invention comprises lightly burnt magnesite and / or lightly burnt brucite as component (1), and lightly burned dolomite as component (2). ) A solidifying / insolubilizing agent in which the weight ratio of the components is 1: 5 to 5: 1, preferably 1: 3 to 3: 1, more preferably 1.2 to 2: 1. It is a solidifying and insolubilizing agent to be applied to one selected from coal ash and gypsum board waste.
[0010]
The first solidification / insolubilization agent of the present invention is suitable for solidification / insolubilization treatment of inorganic soil or organic soil, for example, solidification of soil contaminated with less than 5% by weight of inorganic or organic oil.・ Suitable for insolubilization.
[0011]
The second solidifying / insolubilizing agent of the present invention comprises (1) light burnt magnesite and / or light burnt bluesite, (2) glass powder or oyster shell powder as component, It is a solidification / insolubilization agent whose said (2) component is 1-60 weight part with respect to a weight part, Comprising: It is a solidification / insolubilization agent for applying to inorganic soil or organic soil.
[0012]
The second solidifying / insolubilizing agent of the present invention is suitable for solidifying / insolubilizing treatment of inorganic soil or organic soil. For example, for the purpose of obtaining reclaimed crushed sand, it is suitable for producing reclaimed crushed sand by applying it to dredged sludge, construction sludge, sewage sludge, garbage / dehydrated cake, and the like.
[0013]
The third solidifying / insolubilizing agent of the present invention comprises (1) light burned magnesite and / or light burned brucite, (2) light burned dolomite, (3) glass powder and / or Oyster shell powder, and the weight ratio of the component (1) to the component (2) is 1: 5 to 5: 1, preferably 1: 3 to 3: 1, more preferably 1.2 to 2: 1. And 1 to 60 parts by weight, preferably 5 to 50 parts by weight, and more preferably 5 to 40 parts by weight with respect to 100 parts by weight of the total of the components (1) and (2). It is a solidifying / insolubilizing agent which is a part, and is a solidifying / insolubilizing agent to be applied to one selected from soil, incinerated ash, coal ash and gypsum board waste.
[0014]
The third solidifying / insolubilizing agent of the present invention is, in particular, construction soil, river dredging soil, harbor dredging soil, water purification residue, strong acid soil, inorganic oil contaminated soil (for example, contaminated with inorganic oil). Inorganic soil and organic soil selected from preferably soil with oil content of 5% by weight or more [soil containing organic matter such as sewage sludge, paper sludge, sludge generated from a food manufacturing plant, organic oil It is suitable for use in solidification / insolubilization treatment of contaminated soil (for example, soil contaminated with organic oil, preferably soil having an oil content of 5% by weight or more).
[0015]
The fourth solidifying / insolubilizing agent of the present invention comprises (1) light-burned magnesite and / or light-burned bluesite, (2) light-burned dolomite, (3) glass powder and / or Oyster shell powder and (4) molten phosphorous fertilizer are included, and the weight ratio of the component (1) to the component (2) is 1: 5 to 5: 1, preferably 1: 3 to 3: 1. More preferably, the ratio is 1.2 to 2: 1 and the amount of the component (3) is 1 to 60 parts by weight, preferably 5 to 50 parts per 100 parts by weight in total of the components (1) and (2). Parts by weight, more preferably 5 to 40 parts by weight, and 1 to 100 parts by weight of the component (4) with respect to 100 parts by weight in total of the components (1), (2) and (3). A solidifying / insolubilizing agent selected from soil, incinerated ash, coal ash, and gypsum board waste It was to be applied to one of the object, a solidifying and insolubilizing agents.
[0016]
The fourth solidifying / insolubilizing agent of the present invention is, in particular, when the component (4) is 60 to 100 parts by weight, heavy metal contaminated soil, dioxin contaminated soil, general incineration ash, dioxin-containing incineration ash, coal ash And most suitable for application to one selected from gypsum board waste.
[0017]
The fourth solidifying / insolubilizing agent of the present invention is optimal for application to strongly acidic soil, particularly when the component (4) is 10 to 30 parts by weight.
[0018]
Moreover, the solidification / insolubilization method of the present invention for solving the above-mentioned problems is as follows. (1) per 1000 kg of one kind of workpiece selected from soil and gypsum board scraps adjusted to a moisture content of 80 to 99% by weight. 50 to 200 kg of the first, second, third or fourth solidifying / insolubilizing agent of the present invention described above is mixed, or one kind of material to be treated selected from incineration ash and coal ash is water content 80 to 99 The first, second, third or fourth solidifying / insolubilizing agent of the present invention described above was adjusted to wt%, and 1 m of the dried product of the object to be treated.^Three50 to 200 kg per mixture, (2) kneaded to obtain a kneaded product in a slurry state, and (3) a solidified product that has been changed to a granular product by natural drying or forced drying. .
[0019]
In the solidification / insolubilization method of the present invention, when the first or second solidification / insolubilization agent is applied, the soil is contaminated with inorganic soil, organic soil, oil-contaminated soil (for example, mineral oil or organic oil). Is suitable for solidification / insolubilization method of soil having an oil content of less than 5% by weight, and regenerated crushed sand can be obtained as a granular material by this method.
[0020]
The solidification / insolubilization method of the present invention when the third solidification / insolubilization agent is applied is particularly preferably (1) construction soil, riverbed soil, adjusted to a water content of 80 to 99% by weight, 50 kg to 300 kg of the second solidifying / insolubilizing agent of the present invention is mixed per 1000 kg of one kind of material to be treated selected from harbor dredged soil, water purification system residue and strong acid soil, and (2) kneaded and slurried. (3) Regenerated crushed sand or regenerated crushed stone is obtained by naturally drying or forcibly drying the kneaded product. The solidification / insolubilization method is, in particular, construction soil, river dredging soil, port dredging soil, water purification residue, strong acid soil, inorganic oil-contaminated soil (especially 5% by weight of oil contaminated with inorganic oil) Inorganic soil selected from the above), organic soil [soil containing organic matter, such as sewage sludge, paper sludge, sludge generated from food manufacturing plants, organic oil-contaminated soil (especially organic oil) It is suitable for the solidification / insolubilization method of soil contaminated by 5% by weight of oil).
[0021]
The solidification / insolubilization method of the present invention when the fourth solidification / insolubilization agent is applied includes heavy metal contaminated soil, dioxin contaminated soil, general incineration ash (including fly ash), dioxin-containing incineration ash, coal ash and gypsum. Suitable for solidifying and insolubilizing board scraps.
[0022]
In particular, in the fourth solidifying / insolubilizing agent, the solidifying / insolubilizing agent in which the component (4) is 10 to 30 parts by weight with respect to 100 parts by weight in total of the components (1), (2) and (3). Is suitable for solidification / insolubilization treatment of strongly acidic soil, and the solidification / insolubilization method of the present invention using the solidification / insolubilization agent is (1) a strong acid adjusted to a water content of 80 to 99% by weight. 50 to 300 kg of the solidifying / insolubilizing agent is mixed per 1000 kg of soil, (2) kneaded to obtain a kneaded material in a slurry state, and (3) regenerated crushed sand or regenerated by naturally drying or forcibly drying the kneaded material It is characterized by obtaining crushed stones.
[0023]
In particular, in the fourth solidifying / insolubilizing agent, the solidifying / solubilizing agent in which the component (4) is 60 to 100 parts by weight with respect to 100 parts by weight in total of the components (1), (2) and (3). When using an insolubilizing agent, it is suitable for solidification / insolubilization treatment of one type of object selected from heavy metal contaminated soil, dioxin contaminated soil, dioxin-containing incineration ash, and general incineration ash. The solidification / insolubilization method of the present invention using (1) the solidification / insolubilization per 1000 kg of one kind of treated material selected from heavy metal contaminated soil and dioxin contaminated soil, adjusted to a water content of 80-99% by weight Mixing 50 to 300 kg of the agent, or adjusting the water content to 80 to 99% by weight of one kind of object selected from dioxin-containing incineration ash and general incineration ash, the solidifying / insolubilizing agent according to claim 7 The Dried product 1m of the processed product^Three50 to 300 kg per unit are mixed, (2) kneaded to obtain a kneaded product in a slurry state, and (3) regenerated crushed sand or reclaimed crushed stone is obtained by natural drying or forced drying of the kneaded product.
[0024]
According to the solidification / insolubilization method of the present invention, a kneaded product in a slurry state is obtained, and the kneaded product in a slurry state is naturally left as it is for 30 minutes (at 20 ° C.). Condensation starts and ends in about 2 to 3 hours, and after 3 to 6 days, it becomes a very hard granular material having the same strength as cement.
[0025]
Regarding the setting time when the solidification / insolubilization method of the present invention is applied to an object to be processed, the setting time varies considerably depending on the properties of the object to be processed mixed with the solidifying / insolubilizing agent. The reason for this is when the solidifying / insolubilizing agent reacts with iron contained in the object to be treated or organic substances, or when it reacts with aluminum silicates such as allophane, hydrated halosite, or montmorillonite caused by soil. This is probably because the particle size, specific surface area, adsorption of Mg ions, and the like of the obtained granular material are greatly involved in solidification and solidification.
[0026]
The obtained granular material is one in which elution of harmful components is suppressed or prevented. Although the mechanism of suppression or prevention of the elution of harmful components is not clear, it is probably because the following reactions related to solidification occur integrally with the components of the workpiece for each component. As a very hard granular material. The granular material obtained by the solidification / insolubilization method of the present invention is weakly alkaline with a pH of 8.5 to 9.0, and satisfies the environmental standards of Environment Agency Notification No. 46 that regulates the eluted components.
[0027]
About the particle size of the granular material obtained by the solidification / insolubilization method of this invention, the solidified material of various particle sizes can be obtained by adjusting the component composition in a solidification / insolubilization agent. For example, if the amount of glass powder and / or oyster shell powder is reduced or not added at all, the particle size becomes smaller. Further, when the amount of lightly burned magnesite or lightly burnt bluesite is small, the particle size becomes small. On the other hand, increasing the amount of molten phosphorous fertilizer increases the strength and the particle size.
[0028]
The granular material is very hard and has been rendered harmless to the extent that it meets the environmental standards of Environment Agency Notification No. 46 as described above. Moreover, the to-be-processed object to which the solidification / insolubilizing agent of the present invention is applied becomes a granular solid with high strength and durability in 3 to 6 days. Since the solidified product has a very high uniaxial compressive strength of 50 KN or more, it conforms to the physical properties and particle size of concrete crushed stone defined in JIS A5005 and concrete crushed sand defined in JIS A5004. It can be used as recycled crushed stone, and can be recycled as, for example, a roadbed material and a roadbed material.
[0029]
In the present specification, “insolubilization” refers to suppressing or preventing the elution of harmful components from the solidified solidified product and keeping it within the range of national environmental standards.
In the present specification, “soil” means soil, sludge and / or crushed stone powdered earth and sand.
In this specification, “organic soil” means soil containing an organic substance, and examples thereof include organic oil-contaminated soil.
[0030]
In the present specification, “inorganic soil” means soil that contains an organic substance to a negligible level or does not contain it. In general, construction site and civil engineering site soil, water purification plant sediment sludge, etc. are listed.
[0031]
The “light-burned magnesite” used as one component of the solidifying / insolubilizing agent of the present invention is magnesite (MgCO_Three) In a coal gas furnace or the like at about 800 ° C. to 1100 ° C. for 4 to 5 hours (ie, light calcination) to remove the carbon dioxide gas, thereby being converted into magnesium oxide (MgO).
[0032]
The “lightly burned dolomite” used as one component of the solidifying / insolubilizing agent of the present invention is dolomite (combined magnesite and calcite, ie, MgCO_Three: CaCO_Three) Is lightly burned and carbon dioxide gas is removed to convert it into a combination of magnesium oxide and calcium oxide (MgO: CaO).
[0033]
“Light-fired brucite” used as a component of the solidifying / insolubilizing agent of the present invention is brucite (Mg (OH)₂) Is fired at around 1000 ° C. (that is, lightly baked) to remove carbon dioxide, thereby converting it into magnesium oxide (MgO). Lightly burnt brucite is similar in composition to lightly burnt magnesite and can be used in place of lightly burnt magnesite.
[0034]
When lightly burned magnesite or lightly burned brucite and lightly burned dolomite are brought into contact with water, magnesium oxide reacts to form magnesium hydroxide (Formula 1). At this time, carbon dioxide in the air reacts to produce magnesium carbonate (Formula 2).
[0035]
[Chemical 1]

[0036]
When lightly burned magnesite or lightly burned brucite and lightly burned dolomite are mixed in water-containing soil, magnesium oxide (MgO) in these ores undergoes the reaction of the above formulas (1) and (2). It is thought to occur and forms a solidified product with high strength.
[0037]
At the same time, CaO, which is the main component of light-burned dolomite, reacts with moisture in the soil to produce calcium hydroxide Ca (OH).₂It is considered that the ionized Ca ions neutralize the charge on the surface of the clay particles and solidify the clay particles (porazon reaction). Lightly burned dolomite, when mixed with soil and brought into contact with water, undergoes a hydration reaction, reacts with sulfate ions in the soil, and quickly becomes an ethrin guide (3CaO · Al₂O_Three・ 3CaSO_Four・ 32H₂O) is generated, and the needle-like crystals are considered to crosslink the clay particles, and combined with the formation of a high-strength solidified product by the reaction of the light burned magnesium, a high-strength solidified product is obtained.
[0038]
In addition to these reactions, solidification and insolubilizing agent components are contained in the material to be treated, inorganic carbonic acid compounds, water-soluble organic substances, silicates, iron salts, carbonization of carbon and hydrogen, the main products of crude oil. Since it reacts with various components such as hydrogen, it forms solidified products with various soil components and is considered to have a high strength that does not elute.
[0039]
In addition to these reactions, the glass powder and oyster shell powder contained in the components of the solidifying / insolubilizing agent further add strength to the solidified product. That is, silica contained in glass (SiO₂) And calcium contained in oyster shell powder are calcium ions, silica (SiO₂) And / or by reacting with aluminum, calcium silicate hydrate, calcium aluminate hydrate and the like are produced, solidifying the soil particles and increasing the strength expression. In the solidifying / insolubilizing agent of the present invention, part or all of the glass powder can be replaced with oyster shell powder.
[0040]
Furthermore, at this time, when phosphoric acid is present by addition of molten phosphorous fertilizer or the like, it is considered that magnesium phosphate is generated by the reaction shown in the following formula (3).
[0041]
[Chemical 2]

[0042]
Magnesium oxide and calcium oxide in molten phosphorus fertilizer react with organic chlorine of dioxins to form magnesium chloride and calcium chloride, which promotes the production of harmless compounds.
[0043]
An example of the component analysis value (% by weight) of general light-burned magnesite is shown.
MgO 90.79%
CaO 2.58%
SiO₂                1.99%
Fe₂O_Three              0.63%
Al₂O_Three              0.21%
Ash residue
[0044]
An example of a component analysis value (% by weight) of a general light-burned dolomite is shown.
SiO₂                1.704%
Fe₂O_Three              0.471%
Al₂O_Three              0.163%
CaO 56.38%
MgO 39.27%
P₂O_Five                0.018%
Ash residue
[0045]
An example of the component analysis value (% by weight) of a general light burnt brucite is shown.
MgO 91.15%
CaO 3.17%
SiO₂                1.40%
Fe₂O_Three              0.88%
Al₂O_Three              3.17%
Ash residue
[0046]
An example of component analysis values (% by weight) of general glass powder (raw glass bead raw material) is shown.
SiO₂              78.16%
Al₂O_Three              4.26%
Fe₂O_Three              0.77%
TiO₂                0.30%
CaO 9.36%
MgO 1.73%
K₂O 0.52%
Na₂O 4.33%
[0047]
An example of a component analysis value (% by weight) of a general 20.0 molten phosphorus manure is shown.
20% bitter-soluble phosphoric acid
Calcium oxide 35.85%
Magnesium oxide 20%
15% bitter soluble clay
Soluble silicic acid 20%
[0048]
DETAILED DESCRIPTION OF THE INVENTION
Although the example of preferable embodiment of a process of various to-be-processed objects is shown, this invention is not limited to the following examples.
[0049]
Solidification / insolubilization treatment of inorganic sludge (sewage sludge) (when obtaining recycled crushed sand)
From 100 parts by weight of sewage sludge whose water content is adjusted to about 85%, the weight ratio of glass powder or chaff powder to light burned brucite or light burned magnesite is from 1: 0.01 to 0.6. A slurry is obtained by adding 10 to 20 parts by weight of the solidifying / insolubilizing agent and kneading with a mixer for 2 to 3 minutes. Immediately, the slurry is discharged from the mixer and left on a flat surface. Regarding the start of solidification by the hydration reaction, setting starts from about 30 minutes at room temperature (at about 20 ° C.) and ends in about 180 minutes. Further, if the agglomerated material is allowed to stand, a granular solidified product having high strength and durability can be obtained after 3 to 6 days. By using a classifier or the like, a product such as a roadbed material (5 mm under fine aggregate) can be produced.
[0050]
Solidification and insolubilization treatment of inorganic sludge (sewage sludge) (when obtaining recycled crushed stone)
10-20 parts by weight of the following solidification insolubilizer is mixed with 100 parts by weight of sewage sludge whose water content is adjusted to about 85%. That is, the solidifying and insolubilizing agent has a weight ratio of lightly burned magnesite and / or lightly burned brucite to lightly burned dolomite of 1: 5 to 5: 1, and further glass powder with respect to 100 parts by weight of this mixture. And / or a mixture of 1 to 60 parts by weight of oyster shell powder.
[0051]
The sewage sludge and the solidified insolubilizer are kneaded with a mixer for 2 to 3 minutes to obtain a slurry. Immediately, the slurry is discharged from the mixer and left on a flat surface. Regarding the start of solidification by the hydration reaction, setting starts from about 30 minutes at room temperature (at about 20 ° C.) and ends in about 180 minutes. Further, if the agglomerated material is allowed to stand, a granular solidified product having high strength and durability can be obtained after 3 to 6 days. A roadbed material (RC-40) can be made by using a classifier or the like.
[0052]
Solidification / insolubilization treatment of construction sludge (including bentonite-containing soil) as inorganic soil
100% by weight of sludge generated at the construction site, adjusted to a moisture content of about 85%, lightly burned magnesite (or lightly burned brucite) and lightly burned dolomite (weight ratio 1: 5-5: 1) (Referred to as the main ingredient component), 10-20 parts by weight of a solidifying / insolubilizing agent containing glass powder (1-60 parts by weight per 100 parts by weight of the main ingredient) as a basic component, and kneading 2 to A slurry is obtained by performing for 3 minutes. Immediately, the slurry is discharged from the mixer and left on a flat surface. Regarding the start of solidification by the hydration reaction, setting starts from about 30 minutes at room temperature (at about 20 ° C.) and ends in about 180 minutes. Further, if the agglomerated material is allowed to stand, a granular solidified product having high strength and durability can be obtained after 3 to 6 days. Products such as a roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate) can be produced using a classifier or the like.
[0053]
Solidification and insolubilization treatment of sludge sludge as inorganic soil
Sludge generated by dredging is adjusted to a moisture content of about 85%, and 100 parts by weight of lightly burned magnesite (or lightly burned brucite) and lightly burned dolomite (weight ratio 1: 5 to 5: 1) ( 10 to 30 parts by weight of solidifying / insolubilizing agent containing glass powder (1 to 60 parts by weight per 100 parts by weight of the main ingredient) as a basic component (10 to 10% for riverbed sludge) 30 parts by weight, 10 to 15% by weight with respect to the harbor dredged salt-containing sludge), and kneading with a mixer for 2 to 3 minutes to obtain a slurry. Immediately, the slurry is discharged from the mixer and left on a flat surface. Regarding the start of solidification by the hydration reaction, setting starts from about 30 minutes at room temperature (at about 20 ° C.) and ends in about 180 minutes. Further, if the agglomerated material is allowed to stand, a granular solidified product having high strength and durability can be obtained after 3 to 6 days. After 3 to 6 days, a high-strength and durable granular solidified product is obtained. Products such as roadbed material (RC-40), roadbed material (5 mm under fine aggregate), etc. can be made by classifying machines.
[0054]
Solidification and insolubilization treatment of purified water generated sludge (including polymer condensing agent) as inorganic soil
100 parts by weight of purified water generated sludge adjusted to a moisture content of about 85%, lightly burned magnesite (or lightly burned brucite) and lightly burned dolomite (weight ratio 1: 5 to 5: 1) (main agent) And 10 to 20 parts by weight of a solidifying / insolubilizing agent based on glass powder (1 to 60 parts by weight based on 100 parts by weight of the main ingredient) and kneading with a mixer for 2 to 3 minutes Thus, a slurry is obtained. Immediately, the slurry is discharged from the mixer and left on a flat surface. Regarding the start of solidification by the hydration reaction, setting starts from about 30 minutes at room temperature (at about 20 ° C.) and ends in about 180 minutes. Further, if the agglomerated material is allowed to stand, a granular solidified product having high strength and durability can be obtained after 3 to 6 days. Products such as roadbed material (RC-40), roadbed material (5 mm under fine aggregate), etc. can be made by classifying machines.
[0055]
Solidification and insolubilization of crushed stone powder (including polymer flocculant) as inorganic soil
Lightly burnt magnesite (or lightly burned brucite) and lightly burnt dolomite (weight ratio is 1: 5 to 100 parts by weight of crushed stone powder earth and sand containing a polymer flocculant adjusted to a moisture content of about 85%. 5: 1) (referred to as main ingredient component) and 10 to 20 parts by weight of solidifying / insolubilizing agent based on glass powder (1 to 60 parts by weight per 100 parts by weight of main ingredient component) are added and kneaded in a mixer Is performed for 2 to 3 minutes to obtain a slurry. Immediately, the slurry is discharged from the mixer and left on a flat surface. Regarding the start of solidification by the hydration reaction, setting starts from about 30 minutes at room temperature (at about 20 ° C.) and ends in about 180 minutes. Further, if the agglomerated material is allowed to stand, a granular solidified product having high strength and durability can be obtained after 3 to 6 days. Products such as a roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate) can be produced by using a classifier or the like.
[0056]
Solidification and insolubilization treatment of organic sludge containing 5% or more of organic food oil by food processing as organic soil
Light weight magnesite (or light burnt bluesite) and light burned dolomite (weight ratio is 1) : 5-5: 1) (referred to as main ingredient component) and 10-20 parts by weight of a solidifying / insolubilizing agent based on glass powder (1-60 parts by weight per 100 parts by weight of main ingredient component) The slurry is obtained by kneading for 2 to 3 minutes. Immediately, the slurry is discharged from the mixer and left on a flat surface. Regarding the start of solidification by the hydration reaction, setting starts from about 30 minutes at room temperature (at about 20 ° C.) and ends in about 180 minutes. Further, if the agglomerated material is allowed to stand, a granular solidified product having high strength and durability can be obtained after 3 to 6 days. A product such as a roadbed material (RC-40) roadbed material (5 mm under fine aggregate) can be produced using a classifier or the like.
[0057]
In the case of organic sludge containing less than 5% organic food oil, the amount of light-burned dolomite can be reduced, and the use of glass powder and / or oyster shell powder can be omitted.
The
[0058]
Solidification and insolubilization treatment of mineral oil contaminated soil (soil containing 5% by weight or more of mineral oil)
Lightly burnt magnesite (or lightly burned brucite) and lightly burned dolomite (weight ratio is 1: 5 to 100 parts by weight of the soil containing 10% by weight of mineral oil and adjusted to a moisture content of about 85%. 5: 1) (referred to as main ingredient component) and 10 to 20 parts by weight of solidifying / insolubilizing agent based on glass powder (1 to 60 parts by weight per 100 parts by weight of main ingredient component) are added and kneaded in a mixer Is performed for 2 to 3 minutes to obtain a slurry. Immediately, the slurry is discharged from the mixer and left on a flat surface. Regarding the start of solidification by the hydration reaction, setting starts from about 30 minutes at room temperature (at about 20 ° C.) and ends in about 180 minutes. Further, if the agglomerated material is allowed to stand, a granular solidified product having high strength and durability can be obtained after 3 to 6 days. Products such as roadbed material (RC-40), roadbed material (5 mm under fine aggregate), etc. can be made by classifying machines. It can also be backfilled on site.
[0059]
In the case of organic sludge containing less than 5% by weight of mineral oil and organic food oil, the amount of light-burned dolomite can be reduced, and the use of glass powder and / or oyster shell powder may be omitted. it can.
[0060]
Solidification / insolubilization treatment of oil-contaminated soil (soil containing less than 5% oil)
Oil-contaminated soil containing less than 5% organic vegetable oil or mineral oil, adjusted to a moisture content of about 85%, with 100 parts by weight of lightly burned magnesite (or lightly burned brucite) and lightly burned dolomite (weight ratio) 10 to 20 parts by weight of a solidifying / insolubilizing agent consisting of 1: 5 to 5: 1) is added, and kneading is performed for 2 to 3 minutes with a mixer to obtain a slurry. Immediately, the slurry is discharged from the mixer and left on a flat surface. Regarding the start of solidification by the hydration reaction, setting starts from about 30 minutes at room temperature (at about 20 ° C.) and ends in about 180 minutes. Further, if the agglomerated material is allowed to stand, a granular solidified product having high strength and durability can be obtained after 3 to 6 days. A product such as a roadbed material (5 mm under fine aggregate) can be made by using a classifying machine. It is also possible to backfill the site.
[0061]
Solidification and insolubilization treatment of incinerated ash containing dioxins
Dioxin-containing incineration ash is adjusted to a moisture content of 80 to 99% by weight, and a solidification / insolubilizing agent having the following composition is used as a dry matter of 1 m.^ThreeMix 50 to 200 kg per unit. The composition of the solidifying / insolubilizing agent applied to the dioxin-containing incinerated ash includes light-burned magnesite and / or light-burned brucite, light-burned dolomite, glass powder and / or oyster shell powder, and molten phosphorus fertilizer. , Lightly burned magnesite (or lightly burned brucite) and lightly burned dolomite (weight ratio of 1: 5 to 5: 1) (referred to as main ingredient component) and glass powder (1 to 60 weights per 100 parts by weight of main ingredient component) Part) and a total of 100 parts by weight of each of the above components is 60 to 100 parts by weight of molten phosphorus fertilizer. It is preferable to use 20.0 molten phosphorous fertilizer.
[0062]
Next, the mixture is kneaded in a mixer for 2 to 3 minutes to obtain a slurry. Immediately, the slurry is discharged from the mixer and left on a flat surface. Regarding the start of solidification by the hydration reaction, setting starts from about 30 minutes at room temperature (at about 20 ° C.) and ends in about 180 minutes. Further, if the agglomerated material is allowed to stand, a granular solidified product having high strength and durability can be obtained after 3 to 6 days. Products such as a roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate) can be produced by using a classifier or the like.
[0063]
Solidification and insolubilization of coal ash
Coal ash is adjusted to a moisture content of 80 to 99% by weight, and a solidification / insolubilizing agent having the following composition is used as a dry matter of 1 m.^ThreeMix 50 to 200 kg per unit. The composition of the solidifying and insolubilizing agent applied to the coal ash is as follows: light burned magnesite (or light burned brucite) and light burned dolomite (weight ratio of 1: 5 to 5: 1) (referred to as main component), glass powder (1-60 parts by weight with respect to 100 parts by weight of the main ingredient component) is used as a basic component, and 20.0 molten phosphorous fertilizer (1-100 parts by weight) is further added to the basic component (100 parts by weight). Next, kneading is performed for 2 to 3 minutes with a mixer to obtain a slurry. Immediately, the slurry is discharged from the mixer and left on a flat surface. Regarding the start of solidification by the hydration reaction, setting starts from about 30 minutes at room temperature (at about 20 ° C.) and ends in about 180 minutes. Further, if the agglomerated material is allowed to stand, a granular solidified product having high strength and durability can be obtained after 3 to 6 days. Products such as a roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate) can be produced by using a classifier or the like.
[0064]
Solidification and insolubilization of hot spring soil as strongly acidic soil
Lightly heated magnesite (or lightly burned brucite) and lightly burned dolomite (weight ratio is 1: 5) -5: 1) (referred to as main ingredient component) and glass powder (1 to 60 parts by weight per 100 parts by weight of main ingredient component) as basic components, further 20.0 molten phosphorus in the basic component (100 parts by weight) A slurry is obtained by adding 10-30 weight part of solidification and insolubilizing agents which add fertilizer (1-100 weight part), and knead | mixing for 2 to 3 minutes with a mixer. Immediately, the slurry is discharged from the mixer and left on a flat surface. The start of solidification by the hydration reaction is completed in about 30 to 180 minutes at room temperature (at 20 ° C.). Furthermore, a durable solidified solid with high strength is obtained after 3 to 6 days. Products such as roadbed material (RC-40), roadbed material (5 mm under fine aggregate) and the like can be produced by classification.
[0065]
【Example】
[Example 1]
Solidification / insolubilization treatment of construction sludge
1000kg of sludge discharged from the construction site adjusted to a moisture content of about 85%, light-burned magnesite (40% by weight) (manufactured by Sobueclay Co., Ltd.), light-burned dolomite (30% by weight) (Sobue clay stock) 150 kg of a solidifying / insolubilizing agent consisting of glass powder (manufactured by company) and glass powder (30% by weight) (bottle glass powder, manufactured by Sobueclay Co., Ltd.) was added, and kneading was carried out for 3 minutes with a mixer to obtain a slurry. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation was completed in about 180 minutes at room temperature (about 20 ° C.). Further, the agglomerated material was allowed to stand, and after 3 days, a high-durable, granular solidified product was obtained. This was classified by a classifier to obtain a roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate).
[0066]
Table 1 below shows changes in the concentration of cadmium, lead, and arsenic before and after the solidification / insolubilization treatment of sludge discharged from the construction site.
[0067]
[Table 1]

[0068]
[Example 2]
Solidification and insolubilization of river sludge sludge
River kg sludge adjusted to a moisture content of about 85% water content of 1000kg, light-burned magnesite (40% by weight) (Sobue clay), light-burned dolomite (30% by weight) (Sobue clay) 200 kg of a solidifying / insolubilizing agent consisting of glass powder (30% by weight) (manufactured by Sobueclay Co., Ltd.) was added, and kneading was carried out for 3 minutes with a mixer to obtain a slurry. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation was completed in about 180 minutes at room temperature (about 20 ° C.). Further, the agglomerated material was allowed to stand, and after 3 days, a high-durable, granular solidified product was obtained. This was classified by a classifier to obtain a roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate).
[0069]
[Example 3]
Solidification and insolubilization treatment of purified water sludge containing polymer condensing agent
50kg of purified water-generated sludge containing polymer condensing agent adjusted to a moisture content of about 85%, light-burned magnesite (40 wt%) (manufactured by Sobueclay Co., Ltd.), light-burning dolomite (30 wt%) (Sobueclay) 10 kg of a solidifying / insolubilizing agent consisting of glass powder (30% by weight) (manufactured by Sobueclay Co., Ltd.) and kneading with a mixer for 3 minutes to obtain a slurry. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation was completed in about 180 minutes at room temperature (about 20 ° C.). Further, the agglomerated material was allowed to stand, and after 3 days, a high-durable, granular solidified product was obtained. This was classified by a classifier to obtain a roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate).
[0070]
[Example 4]
Solidification and insolubilization treatment of crushed stone powder containing polymer flocculant
50 kg of crushed stone powder earth and sand containing a polymer flocculant adjusted to a moisture content of about 85%, light-burned magnesite (40% by weight) (manufactured by Sobueclay Co., Ltd.), light-burned dolomite (30% by weight) ( 10 kg of a solidifying / insolubilizing agent consisting of Sobueclay Co., Ltd. and glass powder (30% by weight) (Sobueclay Co., Ltd.) was added, and the mixture was kneaded for 3 minutes to obtain a slurry. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation was completed in about 180 minutes at room temperature (about 20 ° C.). Further, the agglomerated material was allowed to stand, and after 3 days, a high-durable, granular solidified product was obtained. This was classified by a classifier to obtain a roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate).
[0071]
[Example 5]
Solidification and insolubilization treatment of organic sludge containing 10% dietary oil
50kg of sludge containing 10% by weight of dietary oil adjusted to a moisture content of about 85%, light-burned magnesite (40% by weight) (Sobue clay), light-burned dolomite (30% by weight) ( 10 kg of a solidifying / insolubilizing agent consisting of Sobueclay Co., Ltd. and glass powder (30% by weight) (Sobueclay Co., Ltd.) was added, and the mixture was kneaded for 3 minutes to obtain a slurry. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation was completed in about 180 minutes at room temperature (about 20 ° C.). Further, the agglomerated material was allowed to stand, and after 3 days, a high-durable, granular solidified product was obtained. This was classified by a classifier to obtain a roadbed material (5 mm under fine aggregate).
[0072]
[Example 6]
Solidification and insolubilization of oil-contaminated soil containing 10% by weight of mineral oil
50kg of contaminated soil containing 10% by weight of mineral oil, adjusted to a moisture content of about 85%, light-burned magnesite (40% by weight) (Sobueclay Co., Ltd.), light-burned dolomite (30% by weight) ( 10 kg of a solidifying / insolubilizing agent consisting of Sobueclay Co., Ltd. and glass powder (30% by weight) (Sobueclay Co., Ltd.) was added, and the mixture was kneaded for 3 minutes to obtain a slurry. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation was completed in about 180 minutes at room temperature (about 20 ° C.). Further, the agglomerated material was allowed to stand, and after 3 days, a high-durable, granular solidified product was obtained. This was classified by a classifier to obtain a roadbed material (5 mm under fine aggregate).
[0073]
[Example 7]
Solidification and insolubilization treatment of mineral oil contaminated soil (soil containing 1% by weight of mineral oil)
50kg of oil-contaminated soil containing 1% by weight of mineral oil (10000mg / l) with the water content adjusted to about 85%, light-burned magnesite (made by Sobueclay Co., Ltd.) 50wt% and light-burned dolomite (Sobueclay) 10 kg of a solidifying / insolubilizing agent containing 50% by weight as a basic component was added, and kneading was performed for 3 minutes with a mixer to obtain a slurry. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation started from about 30 minutes at room temperature (at about 20 ° C.) and ended in about 180 minutes. Further, the agglomerated material was allowed to stand, and after 3 days, a high-durable, granular solidified product was obtained. It was 13 mg / l when content of the mineral oil of the obtained granular solidified material was measured. This value meets the environmental standards of the 1977 Notification No. 3 prepared by the Environment Agency.
[0074]
The obtained granular solid was classified by a classifier to obtain a roadbed material (5 mm under fine aggregate).
[0075]
[Example 8]
Solidification / insolubilization treatment of mixed ash of dioxin-containing incineration ash and fly ash
A mixed ash of incinerated ash and fly ash containing dioxins (dioxin, dibenzofuran) and coplanar PCBs, adjusted to a moisture content of about 85%, was mixed with 40 kg of solidification / insolubilizer of the following composition. Dry matter 0.2m^ThreeHit and mixed.
[0076]
(Composition of solidifying / insolubilizing agent)
Light burnt magnesite (Sobueclay Co., Ltd.) 20% by weight
Lightly burnt dolomite (made by Sobueclay Co., Ltd.) 20% by weight
Glass powder (Sobueclay Co., Ltd.) 10% by weight
20.0 molten phosphorus fertilizer (made by Tohoku Saw Chemical Co., Ltd.) 50% by weight
[0077]
Next, slurry was obtained by performing kneading for 3 minutes with a mixer. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation started from about 30 minutes at room temperature (at about 20 ° C.) and ended in about 180 minutes. Further, when the agglomerated material was allowed to stand, a solid solidified product having high strength and durability was obtained after 3 days. A roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate) were obtained using a classifier.
[0078]
Table 2 below shows changes in the total concentration of dioxins (dioxins and dibenzofurans) and coplanar PCBs before and after the solidification / insolubilization treatment, and the toxicity equivalent concentration (TEQ) of the total dioxins (dioxins and dibenzofurans) and coplanar PCBs. .
[0079]
[Table 2]

[0080]
[Example 9]
Solidification and insolubilization of coal ash
Coal ash with a moisture content adjusted to about 85%, 10 kg of solidification / insolubilizing agent with the following composition was added to 0.05 m dry coal ash^ThreeHit and mixed.
[0081]
Light burnt magnesite (Sobueclay Co., Ltd.) 20% by weight
Lightly burnt dolomite (made by Sobueclay Co., Ltd.) 30% by weight
Glass powder (made by Sobueclay Co., Ltd.) 20% by weight
20.0 molten phosphorus fertilizer (Tohoku Tohso Chemical Co., Ltd.) 30% by weight
[0082]
Next, slurry was obtained by performing kneading for 3 minutes with a mixer. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation started from about 30 minutes at room temperature (at about 20 ° C.) and ended in about 180 minutes. Further, when the agglomerated material was allowed to stand, a solid solidified product having high strength and durability was obtained after 3 days. This was classified by a classifier to obtain a roadbed material (RC-40). For roadbed materials, the maximum dry density of compaction according to JIS A 1210 is 1.186 g / cm, the degree of compaction (95% dry density) according to JIS A 1211 is 1.126, and the degree of compaction (95% CBR value) is 83. 9%, sufficiently satisfying the standard value of 30% or more of the degree of compaction (95% CBR value) according to the plant regeneration coating technology guideline.
[0083]
[Example 10]
Solidification and insolubilization of hot spring soil as strongly acidic soil
50 kg of hot spring soil showing strong acidity was adjusted to a moisture content of about 85%, and 10 kg of a solidifying / insolubilizing agent having the following composition was mixed.
[0084]
(Composition of solidifying / insolubilizing agent)
Lightly burned magnesite (Sobueclay Co., Ltd.) 30% by weight
Lightly burnt dolomite (made by Sobueclay Co., Ltd.) 30% by weight
Glass powder (made by Sobueclay Co., Ltd.) 20% by weight
20.0 molten phosphorus fertilizer (Tohoku Tohso Chemical Co., Ltd.) 20% by weight
[0085]
Next, slurry was obtained by performing kneading for 3 minutes with a mixer. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation started from about 30 minutes at room temperature (at about 20 ° C.) and ended in about 180 minutes. Further, when the agglomerated material was allowed to stand, a solid solidified product having high strength and durability was obtained after 3 days. A roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate) were obtained using a classifier.
[0086]
[Example 11]
Solidification and insolubilization treatment of sewage sludge (incineration ash)
The water content of 50 kg of sewage sludge (incinerated ash) was adjusted to a moisture content of about 85%, and 10 kg of a solidifying / insolubilizing agent having the following composition was mixed.
[0087]
(Composition of solidifying / insolubilizing agent)
Lightly baked blue sight 30% by weight
Lightly burnt dolomite (made by Sobueclay Co., Ltd.) 30% by weight
Oyster shell powder (Oyster shell powder lime: trade name, manufactured by Hiratsuka Shoten) 20% by weight
[0088]
Next, slurry was obtained by performing kneading for 3 minutes with a mixer. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation started from about 30 minutes at room temperature (at about 20 ° C.) and ended in about 180 minutes. Further, when the agglomerated material was allowed to stand, a solid solidified product having high strength and durability was obtained after 3 days. A roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate) were obtained using a classifier.
[0089]
[Example 12]
Solidification / insolubilization treatment of sewage sludge (dehydrated sludge)
The water content of 50 kg of sewage sludge (dehydrated sludge) was adjusted to a water content of about 85%, and 10 kg of a solidifying / insolubilizing agent having the following composition was mixed.
[0090]
(Composition of solidifying / insolubilizing agent)
Light weight blue sight 90% by weight
Oyster shell powder (Oyster shell powder lime: trade name, manufactured by Hiratsuka Shoten) 10% by weight
[0091]
Next, slurry was obtained by performing kneading for 3 minutes with a mixer. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation started from about 30 minutes at room temperature (at about 20 ° C.) and ended in about 180 minutes. Further, when the agglomerated material was allowed to stand, a solid solidified product having high strength and durability was obtained after 3 days. A roadbed material (5 mm under fine aggregate) was obtained using a classifier.
[0092]
[Example 13]
Solidification / insolubilization treatment of sewage sludge (dehydrated sludge)
The water content of 50 kg of sewage sludge (dehydrated sludge) was adjusted to a water content of about 85%, and 10 kg of a solidifying / insolubilizing agent having the following composition was mixed.
[0093]
(Composition of solidifying / insolubilizing agent)
Light weight blue sight 90% by weight
Glass powder (Sobueclay Co., Ltd.) 10% by weight
[0094]
Next, slurry was obtained by performing kneading for 3 minutes with a mixer. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation started from about 30 minutes at room temperature (at about 20 ° C.) and ended in about 180 minutes. Further, when the agglomerated material was allowed to stand, a solid solidified product having high strength and durability was obtained after 3 days. A roadbed material (5 mm under fine aggregate) was obtained using a classifier.
[0095]
[Example 14]
Solidification / insolubilization treatment of mixed ash of heavy metal-containing incineration ash and fly ash
Mixed ash of incineration ash and fly ash containing heavy metals such as cadmium, lead, hexavalent chromium, mercury, etc., adjusted to a moisture content of about 85%, mixed with 40 kg of solidification / insolubilizer with the following composition 0.2m dry matter^ThreeHit and mixed.
[0096]
(Composition of solidifying / insolubilizing agent)
Light burnt magnesite (Sobueclay Co., Ltd.) 20% by weight
Lightly burnt dolomite (made by Sobueclay Co., Ltd.) 20% by weight
Glass powder (Sobueclay Co., Ltd.) 10% by weight
20.0 molten phosphorus fertilizer (made by Tohoku Saw Chemical Co., Ltd.) 50% by weight
[0097]
Next, slurry was obtained by performing kneading for 3 minutes with a mixer. Immediately, the slurry was discharged from the mixer and left on a flat surface. Condensation started from about 30 minutes at room temperature (at about 20 ° C.) and ended in about 180 minutes. Further, when the agglomerated material was allowed to stand, a solid solidified product having high strength and durability was obtained after 3 days. A roadbed material (RC-40) and a roadbed material (5 mm under fine aggregate) were obtained using a classifier.
[0098]
For elution testing of heavy metals before and after solidification / insolubilization treatment, prepare a sample solution by the elution method of Environment Agency Notification No. 46, and measure cadmium, sinane, lead, hexavalent chromium, arsenic as JIS K In Table 102, the results of the measurement methods of the Environmental Agency Notification No. 64, Appendix 1 of 1974, and mercury according to the Environmental Agency Notification No. 59, Appendix 1 of 1971 are shown in Table 3 below.
[0099]
[Table 3]

[0100]
According to Table 3, it can be seen that elution of heavy metals is suppressed by the solidification / insolubilization method of the present invention.
[0101]
In addition, Table 4 below shows the results of the measurement regarding the content of heavy metals before and after the solidification / insolubilization treatment according to the 1971 Ring Water Pipe No. 127 “Soil Survey Method”.
[0102]
[Table 4]

[0103]
According to Table 4, after the insolubilization treatment, it is understood that the measurement values of lead, arsenic, and boron are low values in the measurement by the 1971 Ring Water Pipe No. 127 “Soil Survey Method”.
[0104]
【The invention's effect】
According to the solidifying / insolubilizing agent and the solidifying / insolubilizing method of the present invention, the obtained solidified product is very hard and detoxified to the extent that it meets the environmental standards of Environment Agency Notification No. 46. Further, the PH value of the solidified product is as low as about 10.0, and the load against alkali pollution is small.
[0105]
The solidified product obtained by applying the solidifying / insolubilizing agent of the present invention becomes a granular solidified product having high strength and durability in 3 to 6 days. The solidified product has a specific gravity of coarse aggregate and an absolute dry specific gravity of 2.50 g / cm in a water absorption test (JISA 1110).^ThreeIn the coarse aggregate wear test (JIS A 1121) by the Lossell tester, the wear loss (%) is 14.1% against the standard value of 50% or less, and in the CBR test (in-house test result, JIS A 1121) Since the average CBR (%) is as high as 132.1 and high strength, it conforms to the physical properties and grain size of concrete crushed stone specified in JIS A5005 and concrete crushed sand specified in JIS A5004. It can be used as crushed sand and recycled crushed stone, and can be recycled as roadbed material, for example.
[0106]
The solidified product obtained by applying the solidifying / insolubilizing agent of the present invention has a porous composition and contains aluminum oxide, so that useful microorganisms contained in the polluted water preferably adhere to the aluminum oxide. Because it decomposes organic matter, it can be used for cleansing polluted water.
[0107]
When 20.0 molten phosphorous fertilizer is included in the solidification / insolubilizing agent of the present invention, oil, heavy metals, dioxins, etc. in the soil can be decomposed and insolubilized solidified products, preventing pollution. Is effective.

Claims (12)

(1) lightly burned magnesite and / or lightly burnt bluesite;
(2) Including light-burned dolomite,
A solidifying / insolubilizing agent in which the weight ratio of the component (1) and the component (2) is 1: 5 to 5: 1,
A solidifying / insolubilizing agent to be applied to one kind of workpiece selected from soil, incinerated ash, coal ash, and gypsum board waste. (1) lightly burned magnesite and / or lightly burnt bluesite;
(2) including glass powder or oyster shell powder,
A solidifying / insolubilizing agent wherein the component (2) is 1 to 60 parts by weight relative to 100 parts by weight of the component (1),
Solidifying / insolubilizing agent for application to inorganic or organic soil. (1) lightly burned magnesite and / or lightly burnt bluesite;
(2) Light dolomite,
(3) glass powder and / or oyster shell powder,
The weight ratio of said (1) component and (2) component is 1: 5-5: 1, and said (3) component is 1 with respect to a total of 100 weight part of said (1) component and (2) component. A solidifying / insolubilizing agent of ~ 60 parts by weight,
A solidifying / insolubilizing agent to be applied to one kind of workpiece selected from soil, incinerated ash, coal ash, and gypsum board waste. (1) lightly burned magnesite and / or lightly burnt bluesite;
(2) Light dolomite,
(3) glass powder and / or oyster shell powder;
(4) including molten phosphorus fertilizer,
The weight ratio of said (1) component and (2) component is 1: 5-5: 1, and said (3) component is 1 with respect to a total of 100 weight part of said (1) component and (2) component. It is a solidifying / insolubilizing agent that is 1 to 100 parts by weight of the component (4) with respect to a total of 100 parts by weight of the component (1), the component (2), and the component (3). hand,
A solidifying / insolubilizing agent to be applied to one kind of workpiece selected from soil, incinerated ash, coal ash, and gypsum board waste. The solidifying / insolubilizing agent according to claim 1, 3 or 4, wherein the soil is inorganic soil, organic soil or oil-contaminated soil. The solidifying / insolubilizing agent according to claim 1, 2, 3, or 4, wherein the soil is one selected from construction-based soil, river-based soil, harbor-based soil, water purification system residue, and strongly acidic soil. A solidifying / insolubilizing agent in which the component (4) is 10 to 30 parts by weight with respect to a total of 100 parts by weight of the component (1), the component (2) and the component (3),
The solidifying / insolubilizing agent according to claim 4, which is applied to strongly acidic soil. A solidifying / insolubilizing agent in which the component (4) is 60 to 100 parts by weight relative to a total of 100 parts by weight of the component (1), the component (2) and the component (3),
The solidification / insolubilizing agent according to claim 4, which is applied to one selected from heavy metal-contaminated soil, dioxin-contaminated soil, dioxin-containing incineration ash, and general incineration ash. (1) The solidification / insolubilizing agent according to any one of claims 1 to 8 per 1000 kg of one kind of object selected from soil and gypsum board waste, adjusted to a moisture content of 80 to 99% by weight. The solidification / insolubilization according to any one of claims 1 to 8, wherein 50 to 200 kg is mixed or one kind of material to be treated selected from incineration ash and coal ash is adjusted to a water content of 80 to 99% by weight. 50 to 200 kg of the agent is mixed per 1 m ³ of the dried product.
(2) Kneading to obtain a kneaded product in a slurry state,
(3) A solidification / insolubilization method characterized in that the kneaded product is naturally dried or forced dried to obtain a solidified product that has been changed to a granular product. (1) Claims per 1000 kg of one kind of material selected from construction soil, river dredging soil, harbor dredging soil, water purification residue and strong acid soil, adjusted to a water content of 80 to 99% by weight 50 to 300 kg of the solidifying / insolubilizing agent described in 3,
(2) Kneading to obtain a kneaded product in a slurry state,
(3) A solidification / insolubilization method characterized in that the kneaded product is naturally dried or forced dried to obtain a solidified product that has been changed to a granular product. (1) 50 to 300 kg of the solidifying / insolubilizing agent according to claim 7 is mixed per 1000 kg of strongly acidic soil adjusted to a moisture content of 80 to 99% by weight,
(2) Kneading to obtain a kneaded product in a slurry state,
(3) A solidification / insolubilization method characterized in that the kneaded product is naturally dried or forced dried to obtain a solidified product that has been changed to a granular product. (1) 50 to 300 kg of the solidifying / insolubilizing agent according to claim 8 is mixed per 1000 kg of one kind of material selected from heavy metal-contaminated soil and dioxin-contaminated soil adjusted to a water content of 80 to 99% by weight. Alternatively, one kind of object to be treated selected from dioxin-containing incineration ash and general incineration ash is adjusted to a water content of 80 to 99% by weight, and the solidification / insolubilizer according to claim 8 is dried on the object to be treated. 50-300 kg per 1 m ³
(2) Kneading to obtain a kneaded product in a slurry state,
(3) A solidification / insolubilization method characterized in that the kneaded product is naturally dried or forced dried to obtain a solidified product that has been changed to a granular product.