JP2003093996A - Method for stabilizing metal-containing waste - Google Patents
Method for stabilizing metal-containing wasteInfo
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- JP2003093996A JP2003093996A JP2001289825A JP2001289825A JP2003093996A JP 2003093996 A JP2003093996 A JP 2003093996A JP 2001289825 A JP2001289825 A JP 2001289825A JP 2001289825 A JP2001289825 A JP 2001289825A JP 2003093996 A JP2003093996 A JP 2003093996A
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- metal
- waste
- containing waste
- stabilizing
- compound
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金属含有廃棄物の
安定化処理方法に関し、特に詳しくは、電炉（ＥＡＦ）
から排出されるダスト、都市ゴミ、産業廃棄物等の各種
廃棄物の処理に用いて好適な金属含有廃棄物の安定化処
理方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stabilizing a metal-containing waste, and more particularly, an electric furnace (EAF).
The present invention relates to a method for stabilizing metal-containing waste, which is suitable for treating various kinds of waste such as dust, municipal waste, industrial waste, etc.
【０００２】[0002]
【従来の技術】従来、電炉（ＥＡＦ）から発生するダス
ト（ＥＡＦダスト）の処理においては、ウェルツキルン
やＭＦ炉を用いてダストの主成分である酸化鉄亜鉛（Ｚ
ｅＦｅ 2Ｏ4）をＺｎの還元揮発反応により分解して粗酸
化亜鉛（ＺｎＯ）とする方法が一般的である。この処理
方法においては、ＥＡＦダストに不純物として含まれる
Ｐｂや塩素（Ｃｌ）がＺｎと共に蒸発・再凝縮すること
により、得られた粗酸化亜鉛に含まれてしまうという問
題点があり、これを解決する方法として、アルカリ水溶
液を用いた湿式法によりダストを予備処理し、ＰｂやＣ
ｌを予め除去しておく方法、あるいは、得られた粗酸化
亜鉛を洗浄することでＰｂやＣｌを除去する方法等が採
られている。2. Description of the Related Art Conventionally, dust generated from an electric furnace (EAF)
Welts kiln
Iron and zinc oxide (Z
eFe 2OFour) Is decomposed by a reducing volatilization reaction of Zn to produce a crude acid.
The method of using zinc oxide (ZnO) is general. This process
In the method, it is contained as an impurity in the EAF dust.
Pb and chlorine (Cl) evaporate and recondense with Zn
Is included in the obtained crude zinc oxide due to
There is a problem, and as a method to solve this, alkaline water solution
Pretreatment of dust by wet method using liquid
Method of removing l in advance, or the obtained crude oxidation
The method of removing Pb and Cl by washing zinc is adopted.
Has been.
【０００３】一方、都市ゴミや産業廃棄物等の焼却施設
から発生する焼却灰、飛灰、あるいはこれらの灰を処理
した２次飛灰等の溶融処理においても、不純物として含
まれるＰｂやＺｎの金属は、蒸発・凝縮過程を経て濃縮
されることが知られている。上記の金属は、主として塩
化物、酸化物、酸塩化物として存在していると考えられ
ている。On the other hand, in the melting treatment of incinerated ash, fly ash, or secondary fly ash produced by treating these ash from incineration facilities for municipal waste, industrial waste, etc., Pb and Zn contained as impurities are also removed. It is known that metals are concentrated through evaporation / condensation processes. The above metals are considered to exist mainly as chlorides, oxides and acid chlorides.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上述した従
来のＥＡＦダストの処理においては、ＰｂやＺｎの金属
の除去が不十分で、僅かながらＥＡＦダスト中に残って
しまうという問題点があった。特に、金属を除去した後
の残渣に硫酸塩等が含まれていた場合、この硫酸塩は残
渣中に微量に含まれるＰｂ、カドミウム（Ｃｄ）、４価
クロム（Ｃｒ（ＩＶ））、Ｃｌ等の有害不純物成分の耐
溶出性に不利であるから、最終的には硫酸塩を除去する
必要がある。この硫酸塩は、都市ゴミ等の焼却灰無害化
処理施設等においても大きな影響を及ぼす可能性があ
り、これらの施設においても、最終的には硫酸塩を分解
して無害化する必要がある。However, in the above-mentioned conventional treatment of EAF dust, there is a problem that the metals such as Pb and Zn are not sufficiently removed, and a little remains in the EAF dust. Particularly, when the residue after removing the metal contains a sulfate or the like, the sulfate is contained in a trace amount in the Pb, cadmium (Cd), tetravalent chromium (Cr (IV)), Cl, etc. Since it is disadvantageous in the elution resistance of the harmful impurity components, the sulfate must be finally removed. This sulphate may have a great influence also on incineration ash detoxification treatment facilities such as municipal waste, and in these facilities as well, it is necessary to finally decompose and detoxify the sulphate.
【０００５】本発明は、上記の課題を解決するためにな
されたものであって、Ｚｎ、Ｐｂ等の金属を効果的に除
去するとともに、これらの金属を除去した後の残渣を金
属の溶出性が極めて低い安定な化合物に変化させること
ができる金属含有廃棄物の安定化処理方法を提供するこ
とを目的とする。The present invention has been made in order to solve the above-mentioned problems. It effectively removes metals such as Zn and Pb, and the residue after the removal of these metals has a metal elution property. It is an object of the present invention to provide a method for stabilizing treatment of a metal-containing waste that can be converted into a stable compound having a very low value.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明は次の様な金属含有廃棄物の安定化処理方法
を採用した。すなわち、本発明の請求項１記載の金属含
有廃棄物の安定化処理方法は、金属を含有する廃棄物を
加熱処理することにより、前記廃棄物から金属を除去し
て安定化させる金属含有廃棄物の安定化処理方法であっ
て、金属を含有する廃棄物を第１の温度領域にて加熱処
理することにより、前記廃棄物に含まれる金属を揮発性
化合物に変化させて該廃棄物から除去し、次いで、金属
が除去された廃棄物を前記第１の温度領域より高温の第
２の温度領域にて加熱処理することにより、該金属が除
去された廃棄物を安定な化合物に変化させることを特徴
とする。In order to solve the above problems, the present invention adopts the following method for stabilizing treatment of metal-containing waste. That is, the method for stabilizing treatment of a metal-containing waste according to claim 1 of the present invention is a metal-containing waste in which a metal-containing waste is heat-treated to remove and stabilize the metal. The method of stabilizing treatment according to claim 1, wherein the metal-containing waste is heated in the first temperature range to convert the metal contained in the waste into a volatile compound and remove the metal from the waste. Then, the waste from which the metal has been removed is subjected to a heat treatment in a second temperature region which is higher than the first temperature region, thereby converting the waste from which the metal has been removed into a stable compound. Characterize.
【０００７】請求項２記載の金属含有廃棄物の安定化処
理方法は、請求項１記載の金属含有廃棄物の安定化処理
方法において、前記金属は、亜鉛および／または鉛であ
ることを特徴とする。According to a second aspect of the present invention, there is provided a method for stabilizing treatment of metal-containing waste according to the first aspect, wherein the metal is zinc and / or lead. To do.
【０００８】請求項３記載の金属含有廃棄物の安定化処
理方法は、請求項１または２記載の金属含有廃棄物の安
定化処理方法において、前記廃棄物は、酸化物、ハロゲ
ン化物、炭酸塩、水酸化物、イオウ含有物のうち１種ま
たは複数種を含むことを特徴とする。A method for stabilizing treatment of metal-containing waste according to a third aspect is the method for stabilizing treatment of metal-containing waste according to the first or second aspect, wherein the waste is an oxide, a halide or a carbonate. , A hydroxide, and a sulfur-containing substance.
【０００９】請求項４記載の金属含有廃棄物の安定化処
理方法は、請求項１、２または３記載の金属含有廃棄物
の安定化処理方法において、前記揮発性化合物は、前記
金属のハロゲン化物であることを特徴とする。The method for stabilizing a metal-containing waste according to claim 4 is the method for stabilizing a metal-containing waste according to claim 1, 2 or 3, wherein the volatile compound is a halide of the metal. Is characterized in that.
【００１０】請求項５記載の金属含有廃棄物の安定化処
理方法は、請求項１ないし４のいずれか１項記載の金属
含有廃棄物の安定化処理方法において、前記安定な化合
物は、耐溶出性の高い化合物であることを特徴とする。The method for stabilizing treatment of metal-containing waste according to claim 5 is the method for stabilizing treatment of metal-containing waste according to any one of claims 1 to 4, wherein the stable compound is resistant to elution. It is characterized by being a highly active compound.
【００１１】請求項６記載の金属含有廃棄物の安定化処
理方法は、請求項１ないし５のいずれか１項記載の金属
含有廃棄物の安定化処理方法において、前記耐溶出性の
高い化合物は、ケイ素化合物であることを特徴とする。The method for stabilizing a metal-containing waste according to claim 6 is the method for stabilizing a metal-containing waste according to any one of claims 1 to 5, wherein the compound having high elution resistance is And a silicon compound.
【００１２】請求項７記載の金属含有廃棄物の安定化処
理方法は、請求項１ないし６のいずれか１項記載の金属
含有廃棄物の安定化処理方法において、前記第１の温度
領域は８００〜１１００℃であり、前記第２の温度領域
は１３００〜３０００℃であることを特徴とする。A method for stabilizing a metal-containing waste according to a seventh aspect is the method for stabilizing a metal-containing waste according to any one of claims 1 to 6, wherein the first temperature range is 800. ˜1100 ° C., and the second temperature range is 1300 to 3000 ° C.
【００１３】[0013]
【発明の実施の形態】本発明の金属含有廃棄物の安定化
処理方法の一実施の形態について説明する。ここでは、
金属含有廃棄物として電炉（ＥＡＦ）ダストを例にと
り、その安定化処理について説明するが、本実施の形態
は、発明の趣旨をより良く理解させるために具体的に説
明するものであるから、特に指定のない限り、本発明を
限定するものではない。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the method for stabilizing a metal-containing waste according to the present invention will be described. here,
Electric furnace (EAF) dust is taken as an example of the metal-containing waste, and its stabilization process will be described. However, since the present embodiment is specifically described in order to make the purpose of the invention better understood, Unless otherwise specified, the present invention is not limited.
【００１４】本実施形態のＥＡＦダストの安定化処理方
法について説明する。まず、ＥＡＦダストを第１温度領
域内の所定の温度にて所定の時間、加熱処理することに
より、ＥＡＦダストに含まれるＰｂ、Ｚｎ等の金属を揮
発性化合物に変化させて該ＥＡＦダストから除去する。A method for stabilizing EAF dust according to this embodiment will be described. First, by heating the EAF dust at a predetermined temperature within the first temperature region for a predetermined time, metals such as Pb and Zn contained in the EAF dust are changed to volatile compounds and removed from the EAF dust. To do.
【００１５】ＥＡＦダストは、Ｐｂ、Ｚｎ、Ｃｄ、Ｃｒ
（ＩＶ）等の金属を含有するとともに、この金属の酸化
物、ハロゲン化物、炭酸塩、水酸化物等の金属化合物、
あるいは、酸化物、ハロゲン化物、炭酸塩、水酸化物、
イオウ含有物等の無機化合物等が含まれる。揮発性化合
物は、前記第１温度領域内の温度で揮発し、ＥＡＦダス
トから散逸するもので、Ｐｂ、Ｚｎ、Ｃｄ、Ｃｒ（Ｉ
Ｖ）等の金属がハロゲンと反応した金属ハロゲン化物が
好適である。EAF dust includes Pb, Zn, Cd and Cr.
(IV) and other metals, and metal compounds such as oxides, halides, carbonates and hydroxides of these metals,
Alternatively, oxides, halides, carbonates, hydroxides,
Inorganic compounds such as sulfur-containing substances are included. The volatile compound is a compound that volatilizes at a temperature within the first temperature range and dissipates from the EAF dust. Pb, Zn, Cd, Cr (I
A metal halide in which a metal such as V) has reacted with a halogen is preferable.
【００１６】第１温度領域は、上記のＰｂ、Ｚｎ、Ｃ
ｄ、Ｃｒ（ＩＶ）等の金属が十分にハロゲン化され、し
かも、生じた金属ハロゲン化物が揮発するのに十分な温
度であればよく、好ましくは８００〜１１００℃、より
好ましくは９００〜１０００℃である。また、第１温度
領域の保持時間は、好ましくは１〜６時間、より好まし
くは３〜４時間である。この第１温度領域は、必要に応
じて複数の温度領域に区分し、処理温度を段階的に上げ
て行く方法を用いてもよい。The first temperature region is the above Pb, Zn, C.
d, a metal such as Cr (IV) is sufficiently halogenated, and a temperature sufficient for volatilizing the produced metal halide is sufficient, preferably 800 to 1100 ° C, more preferably 900 to 1000 ° C. Is. The holding time in the first temperature region is preferably 1 to 6 hours, more preferably 3 to 4 hours. The first temperature region may be divided into a plurality of temperature regions as necessary, and a method of increasing the processing temperature stepwise may be used.
【００１７】上記のＰｂ、Ｚｎ等の金属を除去した後の
ＥＡＦダスト、すなわち残渣を前記第１温度領域より高
温の第２温度領域内の所定の温度にて所定の時間、加熱
処理することにより、この残渣を耐溶出性の高い化合
物、例えばケイ素化合物等の安定な化合物に変化させ
る。By heating the EAF dust after removing the metals such as Pb and Zn, that is, the residue, at a predetermined temperature in a second temperature range higher than the first temperature range for a predetermined time. The residue is changed to a compound having high elution resistance, for example, a stable compound such as a silicon compound.
【００１８】耐溶出性の高い化合物としては、ケイ素化
合物の他、例えば、アルミン酸、アルミノ珪酸塩等が好
適である。ケイ素化合物としては、例えば、シリケート
ガラス、ボロシリケート（硼珪酸塩）ガラス等が好適で
ある。As the compound having high elution resistance, for example, aluminic acid, aluminosilicate and the like are suitable in addition to the silicon compound. As the silicon compound, for example, silicate glass, borosilicate (borosilicate) glass and the like are suitable.
【００１９】第２温度領域は、第１温度領域より高温の
温度領域であればよく、かつ、残渣を耐溶出性の高い化
合物、例えばケイ素化合物等の安定な化合物に変化させ
るのに十分な温度であることが必要である。ＥＡＦダス
トの残渣の場合、好ましくは１３００〜３０００℃、よ
り好ましくは１４００〜３０００℃である。また、第２
温度領域の保持時間は、好ましくは１〜６時間、より好
ましくは２〜３時間である。この第２温度領域において
も、必要に応じて複数の温度領域に区分し、処理温度を
段階的に上げて行く方法を用いてもよい。The second temperature region may be a temperature region higher than the first temperature region, and is a temperature sufficient to change the residue into a compound having high elution resistance, for example, a stable compound such as a silicon compound. It is necessary to be. In the case of EAF dust residue, the temperature is preferably 1300 to 3000 ° C, more preferably 1400 to 3000 ° C. Also, the second
The holding time in the temperature range is preferably 1 to 6 hours, more preferably 2 to 3 hours. Also in this second temperature region, a method of dividing the temperature into a plurality of temperature regions and raising the processing temperature stepwise may be used.
【００２０】このように、ＥＡＦダストに第１温度領域
による加熱処理、第１温度領域より高温の第２温度領域
による加熱処理、という２段階の加熱処理を施すことに
より、Ｚｎ、Ｐｂ等の金属を効果的に除去することがで
き、残渣を金属の溶出性が極めて低い安定な化合物に変
化させることができ、環境対策として極めて効果的であ
る。As described above, the EAF dust is subjected to the two-step heat treatment of the heat treatment in the first temperature region and the heat treatment in the second temperature region higher than the first temperature region, whereby the metal such as Zn, Pb, etc. Can be effectively removed, and the residue can be changed to a stable compound having extremely low metal elution properties, which is extremely effective as an environmental measure.
【００２１】次に、本実施形態のＥＡＦダストの安定化
処理方法の原理について説明する。上記のＥＡＦダスト
の成分は、原料や製造鋼種、操業条件等により異なる
が、この成分のうち、Ｚｎは平均的に１５〜３０重量％
の範囲にあり、鉄酸化物と化合したＺｅＦｅ2Ｏ4または
単体のＺｎＯとして存在している。また、Ｐｂは平均的
に１〜７重量％の範囲にあり、ＰｂＣｌ2等のハロゲン
化物として存在している。表１にＥＡＦダストの組成を
示す。この表１では、２つのサンプル（Ａ、Ｂ）の実測
値と、複数のサンプルの平均的な組成を示してある。Next, the principle of the method for stabilizing EAF dust according to this embodiment will be described. The components of the above EAF dust vary depending on the raw material, the steel type to be manufactured, the operating conditions, etc., but among these components, Zn is 15 to 30 wt% on average.
And exists as ZeFe 2 O 4 combined with iron oxide or ZnO as a simple substance. Further, Pb is in the range of 1 to 7% by weight on average, and is present as a halide such as PbCl 2 . Table 1 shows the composition of EAF dust. In Table 1, the measured values of the two samples (A and B) and the average composition of the plurality of samples are shown.
【００２２】[0022]
【表１】 [Table 1]
【００２３】このＥＡＦダストを安定化処理する場合、
単純にダストに含まれる塩化物が揮発・濃縮するだけで
なく、塩化物と酸化物が下記の式（１）にしたがって反
応する。
ＭＯ＋Ｃｌ2＝ＭＣｌ2＋１／２Ｏ2 ……（１）
例えば、酸化鉛（ＰｂＯ）は、塩化カルシウム（ＣａＣ
ｌ2）と反応し、生成したＰｂＣｌ2が揮発する（塩化揮
発）。ここで、ＮａＣｌを塩化剤としたとき、下記の式
（２）のような反応が成立する。
ＮａＣｌ＋１／２Ｏ2＝Ｃｌ2＋Ｎａ2Ｏ ……（２）When stabilizing the EAF dust,
Not only does chloride contained in dust volatilize and concentrate, but chloride and oxide react according to the following formula (1). MO + Cl 2 = MCl 2 + 1 / 2O 2 (1) For example, lead oxide (PbO) is calcium chloride (CaC).
L 2 ) and PbCl 2 formed is volatilized (chlorination volatilization). Here, when NaCl is used as a chlorinating agent, a reaction as shown in the following formula (2) is established. NaCl + 1 / 2O 2 = Cl 2 + Na 2 O (2)
【００２４】実際、ＮａＣｌを塩化剤とすると、ＰｂＯ
の塩化揮発は生成するＮａ2Ｏの活量がかなり低下しな
いと起こらない。上記のＥＡＦダスト中に共存する物質
の中で、Ｎａ2Ｏの活量を低下させるものとして、例え
ば、ＣＯ2、ＳＯ3、ＳｉＯ2、Ｐ2Ｏ5が挙げられる。In fact, when NaCl is used as a chlorinating agent, PbO
The volatilization of chlorine does not occur unless the activity of the Na 2 O produced is significantly reduced. Among the substances that coexist in the above EAF dust, examples of substances that reduce the activity of Na 2 O include CO 2 , SO 3 , SiO 2 , and P 2 O 5 .
【００２５】図１は、各温度における、Ｎａ2ＣＯ3、Ｎ
ａ2ＳＯ4、Ｎａ2Ｏ−ＳｉＯ2、Ｎａ 2Ｏ−Ｐ2Ｏ5の純成
分中のＮａ2Ｏの活量を示す図である。それぞれのＮａ2
Ｏの活量は、１３００℃程度の高温域においては、ほぼ
同程度の活量の値を示すが、６００〜９００℃の比較的
低温域においては、特にＮａ 2ＳＯ4の活量が１０-8〜１
０-15であり、このＮａ2ＳＯ4はダスト中でＮａ2Ｏの活
量を下げることがわかる。FIG. 1 shows that Na at each temperature2CO3, N
a2SOFour, Na2O-SiO2, Na 2OP2OFivePureness of
Na in the minute2It is a figure which shows the activity of O. Each Na2
The activity of O is almost in the high temperature range of about 1300 ° C.
The value of activity is about the same, but it is relatively high at 600-900 ℃.
In the low temperature range, especially Na 2SOFourActivity of 10-8~ 1
0-15And this Na2SOFourIs Na in the dust2O's activity
You can see that the amount is reduced.
【００２６】Ｎａ2ＳＯ4とＮａ2ＣＯ3それぞれのＮａＣ
ｌとの平衡は、下記の式（３）及び式（４）のように表
される。
ＮａＣｌ＋Ｈ2Ｏ＋ＳＯ3＝Ｎａ2ＳＯ4＋２ＨＣｌ ……（３）
ＮａＣｌ＋Ｈ2Ｏ＋ＣＯ2＝Ｎａ2ＣＯ3＋２ＨＣｌ ……（４）NaC of Na 2 SO 4 and Na 2 CO 3, respectively
The equilibrium with l is expressed by the following equations (3) and (4). NaCl + H 2 O + SO 3 = Na 2 SO 4 + 2HCl (3) NaCl + H 2 O + CO 2 = Na 2 CO 3 + 2HCl (4)
【００２７】図２は、これら２つの式の安定領域をＰ
HCl 2／ＰH2Oと温度の関数として求めたものを示す図で
ある。この図では、Ｎａ2Ｏ−ＳｉＯ2に関して下記の式
（５）
Ｎａ2Ｏ＋２ＨＣｌ＝２ＮａＣｌ＋Ｈ2Ｏ ……（５）
と図１より得られたＮａ2Ｏの活量を代入することによ
りＰHCl 2／ＰH2Oと温度の関数として求めた安定領域も
示している。FIG. 2 shows the stable region of these two equations as P
FIG. 6 shows what was determined as a function of HCl 2 / PH 2 O and temperature. In this figure, P HCl 2 is obtained by substituting the following formula (5) Na 2 O + 2HCl = 2NaCl + H 2 O (5) for Na 2 O—SiO 2 and the activity of Na 2 O obtained from FIG. The stable region determined as a function of / P H2O and temperature is also shown.
【００２８】図２によれば、８００〜１１００℃の比較
的低温の温度領域では、Ｎａ2ＳＯ4が塩化揮発の駆動力
として働くことがわかる。これにより、金属類を塩化揮
発させることにより、残渣中のＰｂ、Ｚｎ等の金属の濃
度を低下させることが可能になる。しかし、その際、残
渣中にＮａ2ＳＯ4等の硫酸塩が生じる。この硫酸塩は残
渣中に微量に含まれる有害成分の耐溶出性に不利である
から、最終的には、硫酸塩を分解させることが必要にな
る。According to FIG. 2, it is understood that Na 2 SO 4 acts as a driving force for chloride volatilization in a relatively low temperature range of 800 to 1100 ° C. This makes it possible to reduce the concentration of metals such as Pb and Zn in the residue by volatilizing and volatilizing the metals. However, at that time, sulfates such as Na 2 SO 4 are generated in the residue. Since this sulfate is disadvantageous in the elution resistance of harmful components contained in a small amount in the residue, it is finally necessary to decompose the sulfate.
【００２９】すなわち、以下のような２段階のステップ
により、効率良く、塩化揮発と、硫酸塩の分解を行う必
要がある。
（１）８００〜１１００℃の比較的低温の温度領域にお
いて、Ｐｂ、Ｚｎを積極的に塩化揮発させて、残渣より
分離する（上記の式（３）の反応）。
（２）１３００〜３０００℃の高温に保持し、シリケー
トにより硫酸塩をＮａ2ＯとＳＯ3に分解し、無害で耐溶
出性の高い物質、例えば、シリケートガラス等を得る。That is, it is necessary to efficiently volatilize chloride and decompose sulfate by the following two steps. (1) In a relatively low temperature range of 800 to 1100 ° C., Pb and Zn are positively chlorinated and volatilized and separated from the residue (reaction of the above formula (3)). (2) Keeping at a high temperature of 1300 to 3000 ° C., the sulfate is decomposed into Na 2 O and SO 3 by silicate to obtain a harmless substance having high elution resistance, such as silicate glass.
【００３０】以上により、本実施形態のＥＡＦダストの
安定化処理方法においては、硫酸塩はＰｂ、Ｚｎ等の金
属の塩化揮発を促進することが明らかになった。したが
って、本実施形態の安定化処理方法は、有効なリサイク
ル処理法を検討するうえで、重要な鍵となることがわか
った。From the above, it has been clarified that, in the method for stabilizing EAF dust according to the present embodiment, the sulfate promotes chlorination volatilization of metals such as Pb and Zn. Therefore, it was found that the stabilization treatment method of the present embodiment is an important key in examining an effective recycling treatment method.
【００３１】以下、本実施形態のＥＡＦダストの安定化
処理方法について、実施例及び比較例により具体的に説
明するが、本発明はこれらの実施例によって限定される
ものではない。The EAF dust stabilization treatment method of the present embodiment will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples.
【００３２】（実施例１）上記の表１のサンプルＡを１
０００℃で６時間、加熱処理し、Ｐｂ及びＺｎを塩化揮
発させた。次いで、Ｐｂ、Ｚｎを除去した後の残渣を１
４００℃で６時間、加熱処理し、無害で耐溶出性の高い
物質であるシリケートガラスを得た。(Example 1) Sample A of Table 1 above
Heat treatment was performed at 000 ° C. for 6 hours to volatilize and volatilize Pb and Zn. Then, the residue after removing Pb and Zn is 1
Heat treatment was performed at 400 ° C. for 6 hours to obtain a silicate glass that is a substance that is harmless and has high elution resistance.
【００３３】上記の残渣のＰｂ、Ｚｎを蛍光Ｘ線分析法
により分析したところ、Ｐｂは１０ｐｐｍ以下、Ｚｎは
２００ｐｐｍ以下であり、効果的に除去されていること
がわかった。上記のシリケートガラスを蛍光Ｘ線分析法
により組成分析したところ、極めて安定したガラスであ
ることがわかった。また、Ｘ線回折パターンを取ったと
ころ、良好なハローが観察され、良好なガラス状態であ
ることがわかった。When Pb and Zn in the above residue were analyzed by a fluorescent X-ray analysis method, it was found that Pb was 10 ppm or less and Zn was 200 ppm or less, and they were effectively removed. Composition analysis of the above silicate glass by fluorescent X-ray analysis revealed that it was an extremely stable glass. Moreover, when an X-ray diffraction pattern was taken, a good halo was observed, and it was found that the glass state was good.
【００３４】（実施例２）上記の表１のサンプルＢを１
０００℃で６時間、加熱処理し、Ｐｂ及びＺｎを塩化揮
発させた。次いで、Ｐｂ、Ｚｎを除去した後の残渣を１
４００℃で６時間、加熱処理し、無害で耐溶出性の高い
物質であるシリケートガラスを得た。上記の残渣のＰ
ｂ、Ｚｎを蛍光Ｘ線分析法により分析したところ、Ｐｂ
は１０ｐｐｍ以下、Ｚｎは２００ｐｐｍ以下であり、効
果的に除去されていることがわかった。Example 2 Sample B of Table 1 above
Heat treatment was performed at 000 ° C. for 6 hours to volatilize and volatilize Pb and Zn. Then, the residue after removing Pb and Zn is 1
Heat treatment was performed at 400 ° C. for 6 hours to obtain a silicate glass that is a substance that is harmless and has high elution resistance. P of the above residue
When b and Zn were analyzed by X-ray fluorescence analysis, Pb
Was 10 ppm or less and Zn was 200 ppm or less, and it was found that they were effectively removed.
【００３５】上記のシリケートガラスを蛍光Ｘ線分析法
により組成分析したところ、極めて安定したガラスであ
ることがわかった。また、Ｘ線回折パターンを取ったと
ころ、良好なハローが観察され、良好なガラス状態であ
ることがわかった。Composition analysis of the above silicate glass by fluorescent X-ray analysis revealed that it was an extremely stable glass. Moreover, when an X-ray diffraction pattern was taken, a good halo was observed, and it was found that the glass state was good.
【００３６】（比較例）上記の表１のサンプルＡを、従
来のアルカリ水溶液を用いた湿式法により処理してＰ
ｂ、Ｚｎを除去した。残った残渣のＰｂ、Ｚｎを蛍光Ｘ
線分析法により分析したところ、Ｐｂは２０００ｐｐ
ｍ、Ｚｎは１００００ｐｐｍであり、上記の実施例１、
２に比べて除去の効果が低いことがわかった。また、表
１のサンプルＢを、同様の従来の方法により処理してＰ
ｂ、Ｚｎを除去した。残った残渣のＰｂ、Ｚｎを蛍光Ｘ
線分析法により分析したところ、Ｐｂは２０００ｐｐ
ｍ、Ｚｎは１００００ｐｐｍであり、上記の実施例１、
２に比べて除去の効果が低いことがわかった。(Comparative Example) Sample A in Table 1 above was treated by a wet method using a conventional alkaline aqueous solution to obtain P.
b and Zn were removed. Fluorescence X was applied to the remaining residue of Pb and Zn.
When analyzed by the line analysis method, Pb is 2000 pp
m and Zn are 10000 ppm, respectively.
It was found that the removal effect was lower than that of No. 2. Also, sample B of Table 1 was processed by the same conventional method to obtain P
b and Zn were removed. Fluorescence X was applied to the remaining residue of Pb and Zn.
When analyzed by the line analysis method, Pb is 2000 pp
m and Zn are 10000 ppm, respectively.
It was found that the removal effect was lower than that of No. 2.
【００３７】以上、本発明の金属含有廃棄物の安定化処
理方法の一実施形態について、ＥＡＦダストの安定化処
理方法を例にとり説明してきたが、具体的な構成は本実
施形態に限定されるものではなく、本発明の要旨を逸脱
しない範囲で設計の変更等が可能である。例えば、本実
施形態ではＥＡＦダストの安定化処理方法について説明
したが、都市ゴミや産業廃棄物等の焼却施設から発生す
る焼却灰、飛灰、あるいはこれらの灰を処理した２次飛
灰等の溶融処理においても、適用することができる。Although one embodiment of the stabilization treatment method of the metal-containing waste of the present invention has been described above by taking the stabilization treatment method of EAF dust as an example, the specific constitution is limited to this embodiment. However, the design can be changed without departing from the scope of the present invention. For example, in the present embodiment, the method for stabilizing EAF dust has been described. However, incineration ash, fly ash, or secondary fly ash obtained by treating the ash generated from an incineration facility for municipal waste, industrial waste, etc. It can also be applied in melt processing.
【００３８】[0038]
【発明の効果】以上説明したように、本発明の金属含有
廃棄物の安定化処理方法によれば、金属を含有する廃棄
物を第１の温度領域にて加熱処理することにより、前記
廃棄物に含まれる金属を揮発性化合物に変化させて該廃
棄物から除去し、次いで、金属が除去された廃棄物を前
記第１の温度領域より高温の第２の温度領域にて加熱処
理することにより、該金属が除去された廃棄物を安定な
化合物に変化させることとしたので、Ｚｎ、Ｐｂ等の金
属を効果的に除去することができ、これらの金属を除去
した後の残渣を金属の溶出性が極めて低い安定な化合物
に変化させることができる。したがって、有効なリサイ
クル処理方法を提供することができる。As described above, according to the method for stabilizing a metal-containing waste of the present invention, the waste containing a metal is heat-treated in the first temperature range to thereby remove the waste. The metal contained in is converted to a volatile compound to be removed from the waste, and then the waste from which the metal has been removed is heat-treated in a second temperature region higher than the first temperature region. Since the waste from which the metal has been removed is changed to a stable compound, metals such as Zn and Pb can be effectively removed, and the residue after removing these metals elutes the metal. It can be changed to a stable compound having extremely low property. Therefore, an effective recycling method can be provided.
【図１】 本発明のＥＡＦダストの安定化処理方法の各
温度における化合物の純成分中のＮａ2Ｏの活量を示す
図である。FIG. 1 is a diagram showing the activity of Na 2 O in a pure component of a compound at each temperature in the method for stabilizing EAF dust according to the present invention.
【図２】 本発明のＮａ2ＳＯ4とＮａ2ＣＯ3それぞれの
ＮａＣｌとの平衡の安定領域をＰHCl 2／ＰH2Oと温度の
関数として求めたものを示す図である。FIG. 2 is a diagram showing a stable region of equilibrium of Na 2 SO 4 and Na 2 CO 3 with NaCl according to the present invention, which is obtained as a function of P HCl 2 / P H2O and temperature.
Claims (7)
とにより、前記廃棄物から金属を除去して安定化させる
金属含有廃棄物の安定化処理方法であって、 金属を含有する廃棄物を第１の温度領域にて加熱処理す
ることにより、前記廃棄物に含まれる金属を揮発性化合
物に変化させて該廃棄物から除去し、次いで、金属が除
去された廃棄物を前記第１の温度領域より高温の第２の
温度領域にて加熱処理することにより、該金属が除去さ
れた廃棄物を安定な化合物に変化させることを特徴とす
る金属含有廃棄物の安定化処理方法。1. A method for stabilizing treatment of a metal-containing waste, comprising removing a metal from the waste by heating the waste containing the metal to stabilize the waste. By heat treatment in the first temperature region, the metal contained in the waste is converted into a volatile compound to be removed from the waste, and then the waste from which the metal has been removed is removed at the first temperature. A method for stabilizing treatment of metal-containing waste, which comprises converting the waste from which the metal has been removed into a stable compound by performing heat treatment in a second temperature region which is higher than the region.
ることを特徴とする請求項１記載の金属含有廃棄物の安
定化処理方法。2. The method for stabilizing treatment of metal-containing waste according to claim 1, wherein the metal is zinc and / or lead.
炭酸塩、水酸化物、イオウ含有物のうち１種または複数
種を含むことを特徴とする請求項１または２記載の金属
含有廃棄物の安定化処理方法。3. The waste is an oxide, a halide,
The method for stabilizing metal-containing waste according to claim 1 or 2, further comprising one or more of carbonates, hydroxides, and sulfur-containing substances.
ン化物であることを特徴とする請求項１、２または３記
載の金属含有廃棄物の安定化処理方法。4. The method for stabilizing a metal-containing waste according to claim 1, 2 or 3, wherein the volatile compound is a halide of the metal.
合物であることを特徴とする請求項１ないし４のいずれ
か１項記載の金属含有廃棄物の安定化処理方法。5. The method for stabilizing treatment of metal-containing waste according to claim 1, wherein the stable compound is a compound having high elution resistance.
合物であることを特徴とする請求項５記載の金属含有廃
棄物の安定化処理方法。6. The method for stabilizing treatment of metal-containing waste according to claim 5, wherein the compound having high elution resistance is a silicon compound.
℃であり、前記第２の温度領域は１３００〜３０００℃
であることを特徴とする請求項１ないし６のいずれか１
項記載の金属含有廃棄物の安定化処理方法。7. The first temperature range is 800 to 1100.
C, and the second temperature range is 1300 to 3000 ° C.
7. The method according to claim 1, wherein
The method for stabilizing treatment of metal-containing waste according to the item.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007078120A1 (en) * | 2005-12-30 | 2007-07-12 | Kyonggi University Industry & Academia Cooperation Foundation | Manufacturing method of glass-ceramics using steel dust in furnace |
-
2001
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007078120A1 (en) * | 2005-12-30 | 2007-07-12 | Kyonggi University Industry & Academia Cooperation Foundation | Manufacturing method of glass-ceramics using steel dust in furnace |
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