JP2002153836A - Material for decreasing elution of heavy metal - Google Patents
Material for decreasing elution of heavy metalInfo
- Publication number
- JP2002153836A JP2002153836A JP2000349553A JP2000349553A JP2002153836A JP 2002153836 A JP2002153836 A JP 2002153836A JP 2000349553 A JP2000349553 A JP 2000349553A JP 2000349553 A JP2000349553 A JP 2000349553A JP 2002153836 A JP2002153836 A JP 2002153836A
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- JP
- Japan
- Prior art keywords
- heavy metal
- elution
- reducing
- cao
- present
- 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.)
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- Fire-Extinguishing Compositions (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、有害な重金属を含
有する廃棄物、汚泥、土壌等からの重金属の溶出を低減
することのできる重金属溶出低減材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy metal elution reducing material capable of reducing the elution of heavy metals from waste, sludge, soil, etc. containing harmful heavy metals.
【０００２】[0002]
【従来の技術】有害物質を含んだ廃棄物、汚泥、土壌等
の処理の際には、何らかの手段による無害化が必要であ
り、該無害化の方法は、従来より多数提案されている。
例えば、重金属を含む廃棄物の処理方法として、特開20
00-37676号公報には、「カルシウムアルミネートおよび
／またはカルシウムシリケートを含む製綱工程での生成
物の粉末を、固定剤として用い、重金属を含む廃棄物の
安定化処理を行うことを特徴とする重金属を含む廃棄物
の安定化処理法」が開示されている。2. Description of the Related Art In the treatment of waste, sludge, soil, etc. containing harmful substances, it is necessary to detoxify by some means, and a number of detoxification methods have been proposed.
For example, Japanese Unexamined Patent Publication No.
JP-A-00-37676 discloses that "a process for stabilizing waste containing a heavy metal is performed by using a powder of a product in a steelmaking process containing calcium aluminate and / or calcium silicate as a fixing agent. A method for stabilizing wastes containing heavy metals is disclosed.
【０００３】[0003]
【発明が解決しようとする課題】一般に、有害な重金属
を含有する廃棄物には、種々の重金属が含まれているこ
とが多い。例えば、ゴミ焼却灰や下水汚泥焼却灰には、
Pb、Cd、Zn、Cr6+等の重金属が含まれている。このよう
なCr6+を含む種々の重金属を含有する廃棄物に対して
は、前記した特開2000-37676号公報に開示される「カル
シウムアルミネートおよび／またはカルシウムシリケー
トを含む製綱工程での生成物の粉末」では、Cr6+の溶出
の低減は困難であった。Generally, waste containing harmful heavy metals often contains various heavy metals. For example, waste incineration ash and sewage sludge incineration ash
It contains heavy metals such as Pb, Cd, Zn, and Cr 6+ . Such wastes containing various heavy metals including Cr 6+ are disclosed in the above-mentioned Japanese Unexamined Patent Publication No. 2000-37676, in the description of "a calcium aluminate and / or calcium silicate in a steel making process. With the product powder, it was difficult to reduce the elution of Cr 6+ .
【０００４】本発明は、上記の課題に鑑みなされたもの
であって、その目的は、Cr6+を含む種々の重金属を含有
する廃棄物等であっても、Cr6+等の重金属の溶出を低減
できる重金属溶出低減材を提供することにある。[0004] The present invention was made in view of the foregoing problems, the object is also a waste containing various heavy metals including Cr 6+, elution of heavy metals such as Cr 6+ It is an object of the present invention to provide a heavy metal elution reducing material capable of reducing the concentration of heavy metal.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、上記の課
題を解決すべく鋭意研究した結果、特定の条件で製造さ
れた特定の化学成分を有する材料であれば、上記課題が
解決されることを見いだし、本発明を完成させたもので
ある。The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, if the material is manufactured under specific conditions and has a specific chemical component, the above-mentioned problems will be solved. And completed the present invention.
【０００６】即ち、本発明は、1000℃以上の還元雰囲気
下で製造され、化学成分としてCaO及びAl2O3を主成分と
することを特徴とする重金属溶出低減材である（請求項
１）。そして、前記重金属溶出低減材は、CaO及びAl2O3
の２成分換算で、CaO量が10〜80重量％、Al2O3量が90〜
20重量％であることが好ましいものである（請求項
２）。That is, the present invention is a heavy metal elution reducing material manufactured under a reducing atmosphere at 1000 ° C. or higher and containing CaO and Al 2 O 3 as main components as chemical components. . And the heavy metal elution reducing material is CaO and Al 2 O 3
In terms of two components, the amount of CaO is 10-80% by weight, and the amount of Al 2 O 3 is 90-80%.
It is preferably 20% by weight (claim 2).
【０００７】[0007]
【発明の実施の形態】以下、本発明について詳しく説明
する。本発明の重金属溶出低減材は、1000℃以上、重金
属溶出低減材の製造コストや生産効率等から好ましくは
1300〜2000℃の還元雰囲気下で製造されるものである。
製造温度が1000℃未満では、重金属溶出低減材の製造に
時間がかかり生産効率が低下するので好ましくない。製
造時の雰囲気が酸化雰囲気では、重金属（特に、Cr6+）
の溶出低減効果が低下するので好ましくない。本発明の
重金属溶出低減材の製造に使用する製造装置は、1000℃
以上での加熱が可能で、かつ、還元雰囲気にすることが
できる製造装置（加熱装置）であれば、特に限定するも
のではなく、例えば、キルン、電気炉、反射炉、キュポ
ラ等が挙げられる。還元雰囲気にする方法としては、例
えば、コークス等の可燃物を後述する原料とともに製造
装置（加熱装置）に投入する、鉄やアルミニウム等の金
属成分を後述する原料とともに製造装置（加熱装置）に
投入する、COやH2等の還元性のガスを流す等の方法が挙
げられる。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The heavy metal elution reducing material of the present invention is preferably at least 1000 ° C., preferably from the viewpoint of production cost and production efficiency of the heavy metal elution reducing material.
It is manufactured under a reducing atmosphere at 1300 to 2000 ° C.
If the production temperature is lower than 1000 ° C., it takes a long time to produce the heavy metal elution reducing material, and the production efficiency is undesirably reduced. Heavy metals (especially Cr 6+ ) when the atmosphere during manufacture is an oxidizing atmosphere
It is not preferable because the effect of reducing the dissolution of the compound decreases. The production equipment used for producing the heavy metal elution reducing material of the present invention is 1000 ° C.
There is no particular limitation on the manufacturing apparatus (heating apparatus) as long as it can perform the above-described heating and can be set in a reducing atmosphere, and examples thereof include a kiln, an electric furnace, a reflective furnace, and a cupola. As a method of reducing the atmosphere, for example, a combustible substance such as coke is charged into a manufacturing apparatus (heating apparatus) together with a raw material described later, and a metal component such as iron or aluminum is charged into a manufacturing apparatus (heating apparatus) together with a raw material described later. And flowing a reducing gas such as CO or H 2 .
【０００８】本発明の重金属溶出低減材は、化学成分と
してCaO及びAl2O3を主成分とするものである。そして、
CaO及びAl2O3を主成分とする本発明の重金属溶出低減材
では、該重金属溶出低減材自身の水和反応速度が大きく
なり、有害物質を含んだ廃棄物、汚泥、土壌等の迅速な
処理が可能となる。本発明の重金属溶出低減材において
は、重金属の溶出低減効果や重金属溶出低減材自身の水
和反応速度の点から、CaO及びAl2O3の２成分換算で、Ca
O量が10〜80重量％、Al2O3量が90〜20重量％とすること
が好ましく、CaO量が15〜60重量％、Al2O3量が85〜40重
量％とすることがより好ましい。The heavy metal elution reducing material of the present invention contains CaO and Al 2 O 3 as main components as chemical components. And
In the heavy metal elution-reducing material of the present invention containing CaO and Al 2 O 3 as main components, the hydration reaction rate of the heavy metal elution-reducing material itself increases, and wastes containing harmful substances, sludge, soil, etc. Processing becomes possible. In the heavy metal elution reducing material of the present invention, from the viewpoint of the heavy metal elution reducing effect and the hydration reaction rate of the heavy metal elution reducing material itself, CaO and Al 2 O 3 are converted into two components.
O amount is 10 to 80 wt%, Al 2 O 3 amount is preferable to be 90 to 20 wt%, CaO content is 15 to 60 wt%, Al 2 O 3 amount be 85 to 40 wt% More preferred.
【０００９】次に、本発明の重金属溶出低減材の製造方
法について説明する。本発明の重金属溶出低減材の製造
方法としては、CaO原料及びAl2O3原料を、好ましくは、
CaO及びAl2O3量の２成分換算で、CaO量が10〜80重量
％、Al2O3量が90〜20重量％となるように製造装置（加
熱装置）に投入し、1000℃以上の還元雰囲気下で加熱
（焼成、溶融等）して製造する方法が挙げられる。前記
CaO原料としては、生石灰、消石灰、石灰石等の工業原
料が、Al2O3原料としては、ボーキサイト、ばん土頁
岩、水酸化アルミニウム、アルミナ等の工業原料やアル
ミナ廃触媒、アルミドロス等のリサイクル原料が挙げら
れる。前記各種原料は、製造装置（加熱装置）に投入す
る前に混合しておいても良いし、個別に製造装置（加熱
装置）に投入しても良い。また、原料は、粉体状のもの
を使用しても良いし、粒状／又は塊状のものを使用して
も良い。なお、前記した各種原料には、SiO2、Fe2O3、T
iO2、MgO等の不純物が含まれている。本発明の重金属溶
出低減材は、これらの不純物を合計で30重量％以下、好
ましくは15重量％以下含有することは差し支えない。ま
た、本発明の重金属溶出低減材は、結晶質、非晶質のい
ずれであってもよい。Next, the method for producing the heavy metal elution reducing material of the present invention will be described. As a method for producing a heavy metal elution reducing material of the present invention, a CaO raw material and an Al 2 O 3 raw material, preferably,
Bicomponent Conversion CaO and Al 2 O 3 amount, CaO amount is 10 to 80 wt%, the amount of Al 2 O 3 is charged into a manufacturing device (heating device) so as to be 90 to 20 wt%, 1000 ° C. or higher In a reducing atmosphere (baking, melting, etc.). Said
The CaO feed, quicklime, hydrated lime, industrial raw materials limestone and the like, as the Al 2 O 3 raw material, bauxite, bands shale, aluminum hydroxide, industrial raw materials and alumina waste catalyst such as alumina, recycling such as aluminum dross material Is mentioned. The various raw materials may be mixed before being charged into the manufacturing apparatus (heating apparatus), or may be individually charged into the manufacturing apparatus (heating apparatus). Further, as the raw material, a powdery material or a granular / lump material may be used. The above-mentioned various raw materials include SiO 2 , Fe 2 O 3 , T
It contains impurities such as iO 2 and MgO. The heavy metal elution reducing material of the present invention may contain these impurities in total of 30% by weight or less, preferably 15% by weight or less. Further, the heavy metal elution reducing material of the present invention may be either crystalline or amorphous.
【００１０】本発明の重金属溶出低減材は、ブレーン比
表面積で、2500cm2/g以上に粉砕して使用することが好
ましい。より好ましいブレーン比表面積は3000〜10000c
m2/gであり、さらに好ましいブレーン比表面積は3500〜
6500cm2/gである。粉砕は、慣用の粉砕装置で行えば良
い。The heavy metal elution reducing material of the present invention is preferably used after being pulverized to a specific surface area of the brane of at least 2500 cm 2 / g. More preferred Blaine specific surface area is 3000 ~ 10000c
m 2 / g, and more preferred Blaine specific surface area is 3500 to
6500 cm 2 / g. The pulverization may be performed with a conventional pulverizer.
【００１１】本発明の重金属溶出低減材の使用にあたっ
ては、有害な重金属を含有する廃棄物、汚泥、土壌等
に、本発明の重金属溶出低減材を水とともに加えて混練
（混合）すればよい。なお、本発明においては、本発明
の目的を阻害しない範囲で、本発明の重金属溶出低減材
とセメント等の水硬性材料及び／又は石灰石粉末、スラ
グ粉末等の無機粉末を併用することは差し支えない。さ
らに、本発明の目的を阻害しない範囲で、セメント減水
剤やセメント遅延剤等を併用することも差し支えない。In using the heavy metal elution-reducing material of the present invention, the heavy metal elution-reducing material of the present invention may be added and kneaded (mixed) together with water to waste, sludge, soil, etc. containing harmful heavy metals. In the present invention, the heavy metal elution reducing material of the present invention and a hydraulic material such as cement and / or an inorganic powder such as limestone powder and slag powder may be used in combination within a range not to impair the object of the present invention. . Furthermore, as long as the object of the present invention is not impaired, a cement water reducing agent, a cement retarder and the like may be used in combination.
【００１２】本発明の重金属溶出低減材は、有害な重金
属を含有する廃棄物、汚泥、土壌等からの重金属の溶出
を低減する効果を有するものである。また、本発明の重
金属溶出低減材は、水硬性材料からの重金属の溶出を低
減する効果も有するものである。The heavy metal elution reducing material of the present invention has an effect of reducing elution of heavy metals from waste, sludge, soil and the like containing harmful heavy metals. Further, the heavy metal elution reducing material of the present invention also has an effect of reducing the elution of heavy metals from hydraulic materials.
【００１３】[0013]
【実施例】以下、実施例により本発明を説明する。 (1)重金属溶出低減材の調製 CaO原料として生石灰、Al2O3原料としてばん土頁岩を使
用し、該原料とコークスを加熱装置に投入し、1600℃の
還元雰囲気下で溶融し、重金属溶出低減材（試料１、
２）を調製した。該重金属溶出低減材は、ボールミルで
ブレーン比表面積5000cm2/gに粉砕した。調製した重金
属溶出低減材の化学分析値を表１に示す。なお、試料３
は、1600℃の酸化雰囲気下で溶融したものである。The present invention will be described below with reference to examples. (1) Preparation of heavy metal elution reducing material Using quick lime as CaO raw material and sand shale as Al 2 O 3 raw material, put the raw material and coke into a heating device, melt under a reducing atmosphere at 1600 ° C, and elute heavy metal Reduction material (Sample 1,
2) was prepared. The heavy metal elution reducing material was pulverized by a ball mill to a Blaine specific surface area of 5000 cm 2 / g. Table 1 shows the chemical analysis values of the prepared heavy metal elution reducing materials. Sample 3
Is melted in an oxidizing atmosphere at 1600 ° C.
【００１４】[0014]
【表１】 [Table 1]
【００１５】実施例１〜２、比較例１ (2)溶出試験１；重金属に汚染された土壌（砂質土、特
性は表２に示す）に対する 重金属溶出
低減効果の測定表３に示す配合で、表２の重金属に汚染
された土壌、重金属溶出低減材、水を混合し、該混合物
をφ3cm×6cmに成形し、該成形体を20℃で24時間養生し
て、供試体を調製した。前記供試体を粉砕し、環境庁告
知13号「産業廃棄物に含まれる金属等の検定方法」に準
じて、重金属の溶出量を測定した。結果を表３に併記す
る。Examples 1-2, Comparative Example 1 (2) Dissolution test 1: Measurement of the effect of reducing the dissolution of heavy metals from soil contaminated with heavy metals (sandy soil, characteristics shown in Table 2) The soil contaminated with heavy metals, the heavy metal elution reducing material and water shown in Table 2 were mixed, the mixture was molded into a size of φ3 cm × 6 cm, and the molded body was cured at 20 ° C. for 24 hours to prepare a specimen. The specimen was pulverized, and the elution amount of heavy metal was measured according to the Environment Agency Notification No. 13 “Method for testing metals and the like contained in industrial waste”. The results are also shown in Table 3.
【００１６】[0016]
【表２】 [Table 2]
【００１７】[0017]
【表３】 [Table 3]
【００１８】表３から、1000℃以上の還元雰囲気下で製
造され、化学成分としてCaO及びAl2O3を主成分とする本
発明の重金属溶出低減材では、重金属の溶出量が少なか
った。 一方、酸化雰囲気下で製造された試料３を使用
した比較例１では、重金属の溶出量が多かった。From Table 3, it can be seen that the heavy metal elution reducing material of the present invention produced under a reducing atmosphere of 1000 ° C. or higher and containing CaO and Al 2 O 3 as main components as chemical components has a small amount of heavy metal elution. On the other hand, in Comparative Example 1 using Sample 3 manufactured in an oxidizing atmosphere, the elution amount of heavy metal was large.
【００１９】実施例３〜４、比較例２〜３(3)溶出試験
２；Cr6+を含有する水硬性材料に対する重金属溶出低減
効果の測定Cr6+含有量が35ppmである普通ポルトランド
セメントクリンカを電気炉にて調製し、該クリンカに石
膏を加えて、Cr6+を含有する水硬性材料を試製した。表
４に示す配合で、前記試製水硬性材料及び重金属溶出低
減材を混合し、環境庁告知13号「産業廃棄物に含まれる
金属等の検定方法」に準じて、重金属の溶出量を測定し
た。結果を表４に併記する。[0019] Example 3-4, Comparative Example 2-3 (3) dissolution test 2; Cr measured Cr 6+ content of heavy metal elution effect of reducing hydraulic material containing 6+ ordinary Portland cement clinker is 35ppm Was prepared in an electric furnace, plaster was added to the clinker, and a hydraulic material containing Cr 6+ was trial-produced. With the formulation shown in Table 4, the trial hydraulic material and heavy metal elution reducing material were mixed, and the elution amount of heavy metal was measured according to the Environment Agency Notification No. 13 “Testing method for metals and the like contained in industrial waste”. . The results are also shown in Table 4.
【００２０】[0020]
【表４】 [Table 4]
【００２１】表４から、1000℃以上の還元雰囲気下で製
造され、化学成分としてCaO及びAl2O3を主成分とする本
発明の重金属溶出低減材では、水硬性材料からの重金属
（Cr 6+）の溶出を低減する効果を有することが分かる。From Table 4, it can be seen that the production was carried out under a reducing atmosphere of 1000 ° C. or more.
CaO and Al as chemical componentsTwoOThreeBook whose main component is
In the heavy metal elution reducing material of the invention, heavy metal from hydraulic material
(Cr 6+) Has the effect of reducing the dissolution.
【００２２】[0022]
【発明の効果】以上詳記したように、本発明の重金属溶
出低減材は、有害な重金属を含有する廃棄物、汚泥、土
壌等からの重金属の溶出を低減する効果を有するもので
ある。また、本発明の重金属溶出低減材は、水硬性材料
からの重金属の溶出を低減する効果も有するものであ
る。さらに、本発明の重金属溶出低減材は、水和反応速
度が大きいので、有害物質を含んだ廃棄物、汚泥、土壌
等の迅速な処理が可能である。As described above in detail, the heavy metal elution reducing material of the present invention has an effect of reducing elution of heavy metals from waste, sludge, soil and the like containing harmful heavy metals. Further, the heavy metal elution reducing material of the present invention also has an effect of reducing the elution of heavy metals from hydraulic materials. Furthermore, since the heavy metal elution reducing material of the present invention has a high hydration reaction rate, rapid treatment of waste, sludge, soil and the like containing harmful substances is possible.
───────────────────────────────────────────────────── 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） Ｃ０２Ｆ 11/00 Ｂ０９Ｂ 3/00 ３０４Ｋ Ｆターム(参考） 2E191 BA02 BB01 BC02 BD01 4D004 AA41 AA46 AB03 BB07 CA34 CC06 CC11 4D059 AA00 BE53 BH08 BK30 CA23 DA04 DA19 EA20 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C02F 11/00 B09B 3/00 304K F-term (Reference) 2E191 BA02 BB01 BC02 BD01 4D004 AA41 AA46 AB03 BB07 CA34 CC06 CC11 4D059 AA00 BE53 BH08 BK30 CA23 DA04 DA19 EA20
Claims (2)
化学成分としてCaO及びAl2O3を主成分とすることを特徴
とする重金属溶出低減材。(1) manufactured under a reducing atmosphere of 1000 ° C. or higher,
A material for reducing elution of heavy metals, comprising CaO and Al 2 O 3 as main components as chemical components.
で、CaO量が10〜80重量％、Al2O3量が90〜20重量％であ
る請求項１に記載の重金属溶出低減材。2. The heavy metal according to claim 1, wherein the chemical components are such that the amount of CaO is 10 to 80% by weight and the amount of Al 2 O 3 is 90 to 20 % by weight in terms of two components of CaO and Al 2 O 3. Elution reducing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000349553A JP2002153836A (en) | 2000-11-16 | 2000-11-16 | Material for decreasing elution of heavy metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000349553A JP2002153836A (en) | 2000-11-16 | 2000-11-16 | Material for decreasing elution of heavy metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002153836A true JP2002153836A (en) | 2002-05-28 |
Family
ID=18822935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000349553A Pending JP2002153836A (en) | 2000-11-16 | 2000-11-16 | Material for decreasing elution of heavy metal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005279413A (en) * | 2004-03-29 | 2005-10-13 | Kanazawa Univ | Elution inhibiter for hazardous element and fly ash subjected to elution inhibiting treatment of hazardous element using the same |
| US8920158B2 (en) | 2005-03-17 | 2014-12-30 | Nox Ii, Ltd. | Reducing mercury emissions from the burning of coal |
| US10612779B2 (en) | 2005-03-17 | 2020-04-07 | Nox Ii, Ltd. | Sorbents for coal combustion |
-
2000
- 2000-11-16 JP JP2000349553A patent/JP2002153836A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005279413A (en) * | 2004-03-29 | 2005-10-13 | Kanazawa Univ | Elution inhibiter for hazardous element and fly ash subjected to elution inhibiting treatment of hazardous element using the same |
| US8920158B2 (en) | 2005-03-17 | 2014-12-30 | Nox Ii, Ltd. | Reducing mercury emissions from the burning of coal |
| US10359192B2 (en) | 2005-03-17 | 2019-07-23 | Nox Ii, Ltd. | Reducing mercury emissions from the burning of coal |
| US10612779B2 (en) | 2005-03-17 | 2020-04-07 | Nox Ii, Ltd. | Sorbents for coal combustion |
| US10641483B2 (en) | 2005-03-17 | 2020-05-05 | Nox Ii, Ltd. | Sorbents for coal combustion |
| US10670265B2 (en) | 2005-03-17 | 2020-06-02 | Nox Ii, Ltd. | Reducing mercury emissions from the burning of coal |
| US10962224B2 (en) | 2005-03-17 | 2021-03-30 | Nox Ii, Ltd. | Sorbents for coal combustion |
| US11060723B2 (en) | 2005-03-17 | 2021-07-13 | Nox Ii, Ltd. | Reducing mercury emissions from the burning of coal by remote sorbent addition |
| US11732889B2 (en) | 2005-03-17 | 2023-08-22 | Nox Ii, Ltd. | Reducing mercury emissions from the burning of coal by remote sorbent addition |
| US11732888B2 (en) | 2005-03-17 | 2023-08-22 | Nox Ii, Ltd. | Sorbents for coal combustion |
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