JPS5838228B2 - Method for treating cyanide and cyanide compounds in solid waste - Google Patents
Method for treating cyanide and cyanide compounds in solid wasteInfo
- Publication number
- JPS5838228B2 JPS5838228B2 JP54105590A JP10559079A JPS5838228B2 JP S5838228 B2 JPS5838228 B2 JP S5838228B2 JP 54105590 A JP54105590 A JP 54105590A JP 10559079 A JP10559079 A JP 10559079A JP S5838228 B2 JPS5838228 B2 JP S5838228B2
- Authority
- JP
- Japan
- Prior art keywords
- cyanide
- solid waste
- compounds
- treating
- cyanide compounds
- 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.)
- Expired
Links
Landscapes
- Processing Of Solid Wastes (AREA)
Description
【発明の詳細な説明】
本発明は、熱処理等に使用したアルカリ塩を主成分とす
る固形廃棄物中のシアン及びシアン化合物を分解して無
毒化する固形廃棄物中のシアン及びシアン化合物の処理
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for treating cyanide and cyanide compounds in solid waste by decomposing and detoxifying the cyanide and cyanide compounds in the solid waste mainly composed of alkali salts used in heat treatment etc. It is about the method.
従来、熱処理等に使用したアルカリ塩を主成分とする固
形廃棄物中のシアン及びシアン化合物の処理方法として
コンクリートパック法あるいはｉ，ｏｏｏ゜Ｃ以上で熱
分解する方法が用いられてきたが、これらの方法は安全
性、経済性の点で問題があった。Conventionally, the concrete pack method or the method of thermal decomposition at temperatures above i,00°C has been used as a method for treating cyanide and cyanide compounds in solid waste mainly composed of alkali salts used for heat treatment, etc. This method had problems in terms of safety and economy.
本発明の目的は、上記の問題を解決して安全且つ経済的
に前記固形廃棄物中のシアン及びシアン化合物を分解し
て無毒化し、廃棄処分を容易にすると共に環境汚染を防
止することができる固形廃棄物中のシアン及びシアン化
合物の処理方法を提供せんとするものである。An object of the present invention is to solve the above problems and safely and economically decompose and detoxify cyanide and cyanide compounds in the solid waste, thereby facilitating disposal and preventing environmental pollution. It is an object of the present invention to provide a method for treating cyanide and cyanide compounds in solid waste.
本発明者は、種々研究の結果、熱処理等に使用したアル
カリ塩を主或分とする固形廃棄物を５００℃以上に加熱
して溶融状態となし、前記溶融状態の固形廃棄物中に空
気及び／又は酸素ガスを吹込むことによりシアン及びシ
アン化合物と酸素との気一液相反応を反応容器全体に及
ぼし、併せてその撹拌効果によって反応速度を著しく向
上させ、シアン及びシアン化合物が完全に且つ安全に酸
化分解して無毒化することを見出し、本発明を完成した
。As a result of various studies, the present inventor heated solid waste mainly consisting of alkali salts used in heat treatment etc. to a temperature of 500°C or higher to make it into a molten state, and found that air and /Or by blowing oxygen gas, a gas-liquid phase reaction between cyanide and cyanide compounds and oxygen is carried out throughout the reaction vessel, and at the same time, the reaction rate is significantly improved by the stirring effect, so that cyanide and cyanide compounds are completely and They discovered that it can be safely oxidized and decomposed to make it non-toxic, and completed the present invention.
本発明による固形廃棄物中のシアン及びシアン化合物の
処理方法は、固形廃棄物を溶融状態となし、その中に空
気及び／，へマ酸素ガスを吹込み、それによってシアン
及びシアン化合物を酸化分解するのであるが、その酸化
反応は次に述べる一般の化学反応の公式に基いて起るも
のと考えられる。The method for treating cyanide and cyanide compounds in solid waste according to the present invention involves melting the solid waste, blowing air and/or hema oxygen gas into it, and thereby oxidizing and decomposing cyanide and cyanide compounds. However, the oxidation reaction is thought to occur based on the general chemical reaction formula described below.
即ち、シアン及びシアン化合物は溶融状態において酸素
と反応してシアン酸塩に酸化される反応が起る。That is, cyanide and cyanide compounds react with oxygen in a molten state and are oxidized to cyanate.
ＣＮ ＋１／２０２−ＣＮＯ （１）
シアン酸塩は更に酸化されて炭酸塩、炭酸ガス、窒素に
分解される。CN +1/202-CNO (1)
Cyanate is further oxidized and decomposed into carbonate, carbon dioxide gas, and nitrogen.
４ＣＮＯ＋３０２−＝−２ＣＯ３＋２ＣＯ２＋２Ｎ２（
２）また、シアン酸塩はある温度以上となると熱分解を
起こし、５００〜７００°Ｃにおいては５分子のＮａＣ
ＮＯは３分子のＮａＣＮに、７００℃以上においては４
分子のＮａＣＮＯは２分子のＮａＣＮに減少する。4CNO+302-=-2CO3+2CO2+2N2(
2) In addition, cyanate undergoes thermal decomposition when the temperature exceeds a certain temperature, and at 500 to 700°C, 5 molecules of NaC
NO becomes 3 molecules of NaCN, and 4 molecules at temperatures above 700°C.
A molecule of NaCNO is reduced to two molecules of NaCN.
５ＮａＣＮＯ５００〜７００′Ｃ３ＮａＣＮ＋Ｎａ２Ｃ
Ｏ３＋Ｎ２＋ＣＯ２（３）
４ＮａＣＮＯ〉７００゜Ｃ２ＮａＣＮ＋Ｎａ２ＣＯ３＋
Ｎ２＋ＣＯ （４）
上述の反応は温度が反応速度の要因となり、５００℃以
上、好ましくは８００℃前後において顕著に起り、上記
（１）〜（４）式の反応が複雑にからみ合うことによっ
てＣＮは結局無毒なｃｏ：ｊ− ， ｃｏ２及びＮ２に
酸化分解されるのである。5NaCNO500~700'C3NaCN+Na2C
O3+N2+CO2(3) 4NaCNO〉700゜C2NaCN+Na2CO3+
N2+CO (4) In the above reaction, temperature is a factor in the reaction rate, and it occurs significantly above 500°C, preferably around 800°C, and due to the complex intertwining of the reactions of formulas (1) to (4) above, CN Eventually, it is oxidized and decomposed into non-toxic co:j-, co2 and N2.
この場合、溶融状態の固形廃棄物を静置しておくかまた
は機械撹拌するのみでは、反応が空気または酸素ガスに
接している表面において起こるに過ぎず反応速度は著し
く遅いが、空気または酸素ガスを吹込むことによって反
応速度を速めることができる。In this case, if the molten solid waste is left standing or mechanically stirred, the reaction will only occur on the surface that is in contact with air or oxygen gas, and the reaction rate will be extremely slow. The reaction rate can be accelerated by blowing in.
本発明により、固形廃棄物を５００℃以上、好ましくは
８００℃前後に加熱して溶融状態となし、空気及び／又
は酸素ガスを直接溶融状態の固形廃棄物中に吹込むこと
により固形廃棄物中のシアン及びシアン化合物を数時間
内で殆んど完全に分解することが可能となった。According to the present invention, solid waste is heated to a temperature of 500°C or higher, preferably around 800°C to bring it into a molten state, and air and/or oxygen gas is directly blown into the molten solid waste. It became possible to almost completely decompose cyanide and cyanide compounds within a few hours.
本発明の効果を、実施例を挙げて説明する。The effects of the present invention will be explained by giving examples.
実施例 １
塩浴軟窒化処理浴のアルカリ塩固形分中の全ＣＮが２８
，４６０咽、遊離ＣＮが２，４００咽、炭酸塩が８０φ
、水分１０φのものを１５０ｋ９、５００φ×８００ｈ
の軟鋼製ポットに入れ、８０００Ｃに加熱して、空気を
２０１７分の流量で吹込んだ。Example 1 Total CN in the alkali salt solid content of the salt bath nitrocarburizing treatment bath was 28
, 460 pharynges, free CN 2,400 pharynges, carbonate 80 φ
, moisture 10φ is 150k9, 500φ×800h
It was placed in a mild steel pot, heated to 8000C, and air was blown in at a flow rate of 2017 minutes.
この結果、約３時間で検出限界以下（Ｊ ＩＳ−ＫＯ
１０２ ， ２９．１ ， ２の方法により蒸留し、２
９．２のピリヂンピラゾロン法により分析した。As a result, it was below the detection limit (JIS-KO) in about 3 hours.
Distilled by the method of 102, 29.1, 2,
It was analyzed by the pyridine pyrazolone method described in Section 9.2.
）となった。実施例 ２
実施例１と同一のアルカリ塩固形分中に酸素を２０ｌ／
分の流量で吹込んだ結果約１時間で検出限界以下となっ
た。). Example 2 Oxygen was added to the same alkali salt solid content as in Example 1 at a rate of 20 l/
As a result of injecting at a flow rate of 10 minutes, it became below the detection limit in about 1 hour.
Claims (1)
廃棄物中のシアン及びシアン化合物の処理において、前
記固形廃棄物を５００℃以上に加熱して溶融状態となし
、前記溶融状態の固形廃棄物中に空気及び／又は酸素ガ
スを吹込み、それによってシアン及びシアン化合物を酸
化分解して無毒化するようにしたことを特徴とする固形
廃棄物中のシアン及びシアン化合物の処理方法。1. In the treatment of cyanide and cyanide compounds in solid waste mainly composed of alkali salts used in heat treatment, etc., the solid waste is heated to 500 ° C. or higher to be in a molten state, and the solid waste in the molten state is 1. A method for treating cyanide and cyanide compounds in solid waste, characterized in that air and/or oxygen gas is blown into the solid waste, thereby oxidizing and decomposing the cyanide and cyanide compounds to detoxify them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54105590A JPS5838228B2 (en) | 1979-08-21 | 1979-08-21 | Method for treating cyanide and cyanide compounds in solid waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54105590A JPS5838228B2 (en) | 1979-08-21 | 1979-08-21 | Method for treating cyanide and cyanide compounds in solid waste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5631484A JPS5631484A (en) | 1981-03-30 |
| JPS5838228B2 true JPS5838228B2 (en) | 1983-08-22 |
Family
ID=14411705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54105590A Expired JPS5838228B2 (en) | 1979-08-21 | 1979-08-21 | Method for treating cyanide and cyanide compounds in solid waste |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5838228B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS516018B2 (en) * | 1972-10-11 | 1976-02-24 |
-
1979
- 1979-08-21 JP JP54105590A patent/JPS5838228B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5631484A (en) | 1981-03-30 |
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