JPH0535003B2 - - Google Patents
Info
- Publication number
- JPH0535003B2 JPH0535003B2 JP369588A JP369588A JPH0535003B2 JP H0535003 B2 JPH0535003 B2 JP H0535003B2 JP 369588 A JP369588 A JP 369588A JP 369588 A JP369588 A JP 369588A JP H0535003 B2 JPH0535003 B2 JP H0535003B2
- Authority
- JP
- Japan
- Prior art keywords
- iron
- aluminum
- hydrochloric acid
- containing waste
- flocculant
- 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 - Lifetime
Links
Landscapes
- Compounds Of Iron (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Description
産業上の利用分野
この発明は、鉄鋼関係の工場で行なわれている
酸洗工程より排出される含鉄廃塩酸を利用して、
凝集性、脱水性、脱臭性に優れた凝集剤を得る凝
集剤の製造法に関するものである。そして本発明
によつて製造される凝集剤は鉄分とアルミニウム
分を含んでおり、その適用分野は広く下水処理
場、し尿処理場、製紙工業、食品工業、鉄鋼工
業、化学工業の各工場より排出される排水、汚泥
の処理に使用される。
従来技術及びその問題点
従来、鉄鋼工業の酸洗工程より排出される含鉄
廃塩酸は、アルカリで中和処理するのがほとんど
であり、一部が塩化第２鉄として利用されている
にすぎない。一法無機凝集剤としては、硫酸バン
ド、ポリ塩化アルミニウムなどのアルミニウム系
と塩化第２鉄、硫黄第２鉄、ポリ硫酸鉄溶液など
の鉄系のものが用いられている。このうちアルミ
ニウム系のものは凝集時に生成させるフロツクは
白色であるがCOD、BOD成分の除去が鉄系より
悪い。また脱水性、脱臭性も鉄系の法が優れてい
る。本発明者らは、これらを改良するために先に
鉄−アルミニウム系の新らしい凝集剤を提案した
（特願昭61−149354号（特公平４−34441号広
報））。
しかしこの新らしい凝集剤を安価に製造するに
はその原料を如何に求めるかが問題である。そし
て鉄鋼工業の酸洗工程より排出させる含鉄廃塩酸
は、アルカリによる中和処理で発生するスラツジ
の処理が問題となつている。
問題点を解決するための手段及びその作用
本発明者らは、含鉄廃塩酸の有効利用と鉄系凝
集剤の製造および使用方法について永年の間研究
を行なつた結果、(1)含鉄廃塩酸に水酸化アルミニ
ウム、酸化アルミニウムなどのアルミニウム原料
が溶解すること、(2)溶解時に発熱するので加温す
る必要がないこと、(3)塩酸と硫酸の混酸の方が硫
酸よりもアルミニウムの溶解度が大きいこと、(4)
含鉄廃塩酸中の鉄はほとんどが２価であること、
(5)２価の鉄を３価の鉄に酸化するにはアルミニウ
ムを溶解後にすると酸化し易いこと、(6)２価の鉄
を酸化することによつてOH基が生成されるこ
と、すなわち塩基度が得られること、(7)塩基度が
あると凝集力が増加すること、(8)Al／Feのモル
比の値が小さすぎると処理水が着色するし、大き
すぎるとCOD、BOD成分の除去が悪くなること
を知見した。
本発明はこれらの知見に基ずくものであつて、
80℃以下の温度で含鉄廃塩酸にアルミニウム分の
硫酸分を添加し、Al／Feのモル比が0.06〜1.0、
Cl／SO4のモル比が1.25〜0.08、AlとFeのモル数
の和が１〜４モル／の濃度になるように調整し
た後に、２価の鉄を酸化することを特徴とする含
鉄廃塩酸を利用した凝集剤の製造法である。
本発明では処理温度を80℃以下としたのは、80
℃以上では反応槽の材質が問題となるのと、生成
する鉄とアルミニウムの共役ポリマーが不安定と
なり塩基性塩が沈でんするためである。Al／Fe
のモル比の値を0.06〜1.0としたのは、第１表よ
り明らかなように0.06未満では処理水が着色する
し、1.0以上ではCODの除去率が低下するからで
ある。
Industrial Application Field This invention utilizes iron-containing waste hydrochloric acid discharged from the pickling process carried out in steel-related factories.
The present invention relates to a method for producing a flocculant that has excellent flocculating properties, dehydration properties, and deodorizing properties. The flocculant produced by the present invention contains iron and aluminum, and can be widely applied to wastewater discharged from sewage treatment plants, human waste treatment plants, paper manufacturing, food industry, steel industry, and chemical industry factories. It is used to treat wastewater and sludge. Conventional technology and its problems Conventionally, iron-containing waste hydrochloric acid discharged from the pickling process in the steel industry is mostly neutralized with alkali, and only a portion is used as ferric chloride. . As one-method inorganic flocculants, aluminum-based coagulants such as aluminum sulfate and polyaluminum chloride, and iron-based coagulants such as ferric chloride, ferric sulfur, and polyferric sulfate solutions are used. Among these, aluminum-based materials produce white flocs during aggregation, but removal of COD and BOD components is worse than iron-based materials. Iron-based methods also have excellent dehydration and deodorizing properties. In order to improve these problems, the present inventors have previously proposed a new iron-aluminum type flocculant (Japanese Patent Application No. 149354/1983 (publication of Japanese Patent Application No. 34441/1999)). However, in order to manufacture this new flocculant at a low cost, the problem is how to obtain the raw materials. As for iron-containing waste hydrochloric acid discharged from pickling processes in the steel industry, the treatment of sludge generated during neutralization with alkali has become a problem. Means for Solving the Problems and Their Effects As a result of many years of research into the effective use of iron-containing waste hydrochloric acid and methods for producing and using iron-based flocculants, the present inventors have found that (1) iron-containing waste hydrochloric acid; Aluminum raw materials such as aluminum hydroxide and aluminum oxide are dissolved in the solution, (2) heat is generated during dissolution, so there is no need for heating, and (3) the solubility of aluminum is higher in a mixed acid of hydrochloric acid and sulfuric acid than in sulfuric acid. Big (4)
Most of the iron in iron-containing waste hydrochloric acid is divalent;
(5) To oxidize divalent iron to trivalent iron, it is easier to oxidize aluminum after it has been dissolved, (6) OH groups are generated by oxidizing divalent iron, i.e. (7) Basicity increases cohesive force; (8) If the molar ratio of Al/Fe is too small, the treated water will be colored; if it is too large, COD and BOD will occur. It was found that the removal of components became worse. The present invention is based on these findings, and
A sulfuric acid content of aluminum is added to iron-containing waste hydrochloric acid at a temperature of 80℃ or less, and the molar ratio of Al/Fe is 0.06 to 1.0.
Iron-containing waste characterized by oxidizing divalent iron after adjusting the concentration so that the molar ratio of Cl/SO 4 is 1.25 to 0.08 and the sum of the moles of Al and Fe is 1 to 4 mol/. This is a method for producing a flocculant using hydrochloric acid. In the present invention, the processing temperature is set to 80℃ or less.
At temperatures above ℃, the material of the reaction tank becomes a problem, and the conjugated polymer of iron and aluminum that is produced becomes unstable, causing the basic salt to precipitate. Al／Fe
The reason why the value of the molar ratio of is set to 0.06 to 1.0 is because, as is clear from Table 1, if it is less than 0.06, the treated water will be colored, and if it is more than 1.0, the COD removal rate will decrease.
【表】【table】
【表】
またCl／SO4のモル比の値を1.25〜0.08とした
のは、1.25以上では使用時のPH低下が大きく、腐
食も大きくなるからであり、0.08未満では得られ
る凝集剤の安定度が悪く、特に農厚溶液では硫酸
アルミニウムが析出する。
つぎにAlとFeのモル数の和が１〜４モル／
の濃度になるように調整するのは、溶液の安定性
を得るためである。また上記のような液組成の調
整後に２価の鉄を酸化するのは、アルミニウムを
溶解するためには遊離酸が必要であり、２価の鉄
を先に酸化すると遊離酸が減少し、所定のアルミ
ニウムの濃度が得られなくなるからである。
実施例
Ｔ−Fe150ｇ／（うちFe2+147ｇ／）、
Cl-300ｇ／の含鉄廃塩酸350に、TFe15ｇ／
、SO4 --640ｇ／の組成を廃硫酸を190添加
し、これに水160とアルミニウム分が24.5％の
水酸化アルミニウムを106Kg加えて撹拌したとこ
ろ60℃に温度が上昇した。１時間後にNaClO3を
18Kg添加して２価の鉄を酸化した。得られた製品
はＴ−Fe75ｇ／、Al35ｇ／、SO4 --165ｇ／
、Cl-140ｇ／の組成のものが1000Kgであつ
た。これを凝集剤として使用したところ硫酸バン
ド、ポリ塩化アルミニウム、ポリ硫酸鉄より
COD、BOD成分の除去、脱色、脱臭等の性能に
おいて優れていた。
発明の効果
この発明によれば鉄鋼工業の酸洗工程より排出
される含鉄廃塩酸が有効に利用され、性能の優れ
た凝集剤を得ることができる。[Table] The reason why the value of the molar ratio of Cl/SO 4 was set to 1.25 to 0.08 is that if it is over 1.25, the pH during use will be large and corrosion will be large.If it is less than 0.08, the obtained flocculant will be unstable. The degree of corrosion is poor, and aluminum sulfate precipitates especially in the agricultural solution. Next, the sum of the moles of Al and Fe is 1 to 4 moles/
The reason for adjusting the concentration is to obtain stability of the solution. In addition, oxidizing divalent iron after adjusting the liquid composition as described above requires free acid to dissolve aluminum, and if divalent iron is oxidized first, the amount of free acid decreases, resulting in a reduction in the amount of free acid. This is because it becomes impossible to obtain an aluminum concentration of . Example T-Fe 150g/(including Fe 2+ 147g/),
Cl - 300g/350 of iron-containing waste hydrochloric acid, TFe15g/
, SO 4 -- 640g/190g of waste sulfuric acid was added, 160g of water and 106kg of aluminum hydroxide with an aluminum content of 24.5% were added and stirred, and the temperature rose to 60°C. After 1 hour, add NaClO3
18 kg was added to oxidize divalent iron. The obtained product is T-Fe75g/, Al35g/, SO 4 -- 165g/
, Cl - 140g/1000Kg. When this was used as a flocculant, it was found to be more effective than sulfuric acid, polyaluminum chloride, and polyferric sulfate.
It had excellent performance in removing COD and BOD components, decolorizing, and deodorizing. Effects of the Invention According to the present invention, iron-containing waste hydrochloric acid discharged from the pickling process in the steel industry is effectively utilized, and a flocculant with excellent performance can be obtained.
Claims (1)
分と硫酸分を添加し、Al／Feのモル比が0.06〜
1.0、Cl／SO4のモル比が1.25〜0.08、AlとFeのモ
ル数の和が１〜４モル／の濃度になるように調
整した後に、２価の鉄を酸化することを特徴とす
る含鉄廃塩酸を利用した凝集剤の製造法。1. Add aluminum and sulfuric acid to iron-containing waste hydrochloric acid at a temperature of 80°C or less to achieve an Al/Fe molar ratio of 0.06 to
It is characterized by oxidizing divalent iron after adjusting the concentration so that the molar ratio of Cl/SO 4 is 1.25 to 0.08 and the sum of the moles of Al and Fe is 1 to 4 mol/1.0. A method for producing a flocculant using iron-containing waste hydrochloric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP369588A JPH01180210A (en) | 1988-01-13 | 1988-01-13 | Production of flocculant by utilizing waste hydrochloric acid containing iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP369588A JPH01180210A (en) | 1988-01-13 | 1988-01-13 | Production of flocculant by utilizing waste hydrochloric acid containing iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01180210A JPH01180210A (en) | 1989-07-18 |
| JPH0535003B2 true JPH0535003B2 (en) | 1993-05-25 |
Family
ID=11564519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP369588A Granted JPH01180210A (en) | 1988-01-13 | 1988-01-13 | Production of flocculant by utilizing waste hydrochloric acid containing iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01180210A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2023139777A (en) * | 2022-03-22 | 2023-10-04 | 日鉄鉱業株式会社 | metal salt flocculant |
-
1988
- 1988-01-13 JP JP369588A patent/JPH01180210A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01180210A (en) | 1989-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
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Year of fee payment: 15 Free format text: PAYMENT UNTIL: 20080525 |