JPS6038341B2 - Method for reducing hexavalent chromium - Google Patents

Method for reducing hexavalent chromium

Info

Publication number
JPS6038341B2
JPS6038341B2 JP1968181A JP1968181A JPS6038341B2 JP S6038341 B2 JPS6038341 B2 JP S6038341B2 JP 1968181 A JP1968181 A JP 1968181A JP 1968181 A JP1968181 A JP 1968181A JP S6038341 B2 JPS6038341 B2 JP S6038341B2
Authority
JP
Japan
Prior art keywords
hexavalent chromium
chromium
waste oil
oil shale
reducing hexavalent
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
Application number
JP1968181A
Other languages
Japanese (ja)
Other versions
JPS57135724A (en
Inventor
勇 斎藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agency of Industrial Science and Technology filed Critical Agency of Industrial Science and Technology
Priority to JP1968181A priority Critical patent/JPS6038341B2/en
Publication of JPS57135724A publication Critical patent/JPS57135724A/en
Publication of JPS6038341B2 publication Critical patent/JPS6038341B2/en
Expired legal-status Critical Current

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  • Inorganic Compounds Of Heavy Metals (AREA)

Description

【発明の詳細な説明】 本発明は、オイルシヱールから合成石油を抽出した残澄
を利用して酸性溶液中の六価クロムを三価クロムに還元
する方法。DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for reducing hexavalent chromium in an acidic solution to trivalent chromium using the residual liquid obtained by extracting synthetic petroleum from oil shel.

一般に六価クロムを含む廃水は硫酸第一鉄その他の還元
剤で三価クロムに還元した後、中和剤で処理している。Generally, wastewater containing hexavalent chromium is reduced to trivalent chromium using ferrous sulfate or other reducing agents, and then treated with a neutralizing agent.

本法は、こ六価クロムの還元に廃オイルシェールを利用
するもので、次の特長がある。１ 六価クロムの還元は
ｐＨ約３．５以下の酸性溶液で行なわれ、酸濃度が高く
なるに従い還元速度も早くなる。This method uses waste oil shale to reduce hexavalent chromium, and has the following features: 1. Reduction of hexavalent chromium is carried out in an acidic solution with a pH of about 3.5 or less, and the rate of reduction increases as the acid concentration increases.

２ 反応は六価クロムを含む水溶液に廃オイルシェール
を添加し接触させると、比較的短時間で進行する。2. When waste oil shale is added to and brought into contact with an aqueous solution containing hexavalent chromium, the reaction proceeds in a relatively short time.

３ 廃オイルシェールを塩酸処理したものは、さらに還
元促進効果をもつようになる。3. Waste oil shale treated with hydrochloric acid has a further reduction promoting effect.

本発明に使用した廃オイルシヱールはタィ国及び米国産
オイルシェールを回分式レトルトを使用し、窒素をキャ
リャーガスとして５００肌／ｍｉｎ通気ごせながら、５
００〜６００ｏｏで乾留し、油を抽出したあとの残涜で
あり、これを−１００十２００メッシュに粒度を調整し
たものである。The waste oil shale used in the present invention was produced using oil shale from Thailand and the United States in a batch retort, and was aerated at 500 skins/min using nitrogen as a carrier gas.
This is the residue after carbonization at 00 to 600 oo and oil extraction, and the particle size is adjusted to -100 to 200 mesh.

また、さらに、これらの廃オイルシェールを州塩酸溶液
で、５０００８時間の酸処理を行なったのち、よく水洗
し、１００ｏｏで乾燥したものである。本発明による実
験結果を第１〜２表に示す。実験は２００肌の三角フラ
スコ又は５００叫のセパラブルフラスコに六価クロムを
含む酸性溶液を入れ、これに所定量の廃オイルシェール
又はこれを酸処理したものを添加したのち、マグネテイ
ツクスタラ一でかくはん操作をした。反応後、ろ液中の
全Ｃｒ，Ｃｒ（の）量をもとめ還元率をもとめた。第１
表 六価クロムの残存率に及ぼす酸濃度及び反応時間の
影響Ｃｒ（Ｗ）：５２．０の９／夕、温度２５ｏｏ米国
産廃オイルシェ−ル １夕／１０血【第２表 種類別に
よる残存六価クロムの変化Ｃｒ（Ｗ）：５２．０の夕／
夕、温度 ２５ｏｏ廃オイルシヱール添加量 １多／１
００の‘反応時間 １時間比Ｓ０４濃度 ０．０５ｈｏ
ｌ／そIn addition, these waste oil shale were acid-treated with a hydrochloric acid solution for 50,008 hours, thoroughly washed with water, and dried at 100°C. Experimental results according to the present invention are shown in Tables 1 and 2. In the experiment, an acidic solution containing hexavalent chromium was placed in a 200mm Erlenmeyer flask or a 500mm separable flask, and a predetermined amount of waste oil shale or an acid-treated solution was added thereto. I did a huge operation. After the reaction, the total amount of Cr and Cr in the filtrate was determined to determine the reduction rate. 1st
Table Effect of acid concentration and reaction time on residual rate of hexavalent chromium Cr(W): 52.0 9/night, temperature 25oo US industrial oil shale 1 evening/10 blood [Table 2 Residual chromium by type Change in valence chromium Cr(W): 52.0 evening/
Evening, temperature: 25 oo, amount of waste oil seal added: 1/1
00' reaction time 1 hour ratio S04 concentration 0.05ho
l/so

Claims (1)

【特許請求の範囲】[Claims] １ 酸性溶液中の六価クロムに廃オイルシエールはこれ
を酸処理したものを接触させ六価クロムを三価クロムに
還元することを特徴とする六価クロムの還元方法。1. A method for reducing hexavalent chromium, which comprises contacting hexavalent chromium in an acidic solution with acid-treated waste oil siel to reduce hexavalent chromium to trivalent chromium.
JP1968181A 1981-02-13 1981-02-13 Method for reducing hexavalent chromium Expired JPS6038341B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1968181A JPS6038341B2 (en) 1981-02-13 1981-02-13 Method for reducing hexavalent chromium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1968181A JPS6038341B2 (en) 1981-02-13 1981-02-13 Method for reducing hexavalent chromium

Publications (2)

Publication Number Publication Date
JPS57135724A JPS57135724A (en) 1982-08-21
JPS6038341B2 true JPS6038341B2 (en) 1985-08-31

Family

ID=12005971

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1968181A Expired JPS6038341B2 (en) 1981-02-13 1981-02-13 Method for reducing hexavalent chromium

Country Status (1)

Country Link
JP (1) JPS6038341B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0214545U (en) * 1988-07-08 1990-01-30

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5571489A (en) * 1995-01-27 1996-11-05 Illinois Institute Of Technology Process for chromium recovery from aqueous solutions
ES2663683T3 (en) * 2012-07-06 2018-04-16 Lanxess Deutschland Gmbh Procedure for the reduction of hexavalent chromium in solid oxidic substances
CN114853372B (en) * 2022-03-31 2024-04-09 铁岭大伙房水泥有限责任公司 Low-chromium cement clinker combining oil shale slag and stainless steel slag and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0214545U (en) * 1988-07-08 1990-01-30

Also Published As

Publication number Publication date
JPS57135724A (en) 1982-08-21

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