JP2002029732A - Method for recovering boric acid from boron eluate - Google Patents

Method for recovering boric acid from boron eluate

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Publication number
JP2002029732A
JP2002029732A JP2000217631A JP2000217631A JP2002029732A JP 2002029732 A JP2002029732 A JP 2002029732A JP 2000217631 A JP2000217631 A JP 2000217631A JP 2000217631 A JP2000217631 A JP 2000217631A JP 2002029732 A JP2002029732 A JP 2002029732A
Authority
JP
Japan
Prior art keywords
boron
boric acid
sodium sulfate
solution
crystals
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.)
Pending
Application number
JP2000217631A
Other languages
Japanese (ja)
Inventor
Satoshi Hayakawa
智 早川
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.)
Nippon Denko Co Ltd
Original Assignee
Nippon Denko Co Ltd
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 Nippon Denko Co Ltd filed Critical Nippon Denko Co Ltd
Priority to JP2000217631A priority Critical patent/JP2002029732A/en
Publication of JP2002029732A publication Critical patent/JP2002029732A/en
Pending legal-status Critical Current

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  • Removal Of Specific Substances (AREA)
  • Treatment Of Water By Ion Exchange (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently obtaining crystals of boric acid and crystals of a neutral salt such as sodium sulfate. SOLUTION: When boric acid is recovered from a sulfuric acid ion-containing boron eluate produced by adsorbing boron on an ion exchange resin by the treatment of boron-containing waste water and making a sulfuric acid solution pass through the resin to elute the boron, the boron eluate is converted to a mixed solution of boric acid and sodium sulfate by neutralization and this mixed solution is heated and cooled to separately crystallize the boric acid and sodium sulfate by the solubility difference between boric acid and sodium sulfate.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、ホウ素を含有する
排水を通液してホウ素を吸着したイオン交換樹脂に酸溶
液を通液してホウ素を溶離した酸根を含むホウ素溶離液
を処理して高純度のホウ酸を回収する方法に関する。
The present invention relates to a method for treating a boron eluate containing an acid radical containing boron and eluted boron by passing an acid solution through an ion-exchange resin adsorbing boron by passing waste water containing boron. The present invention relates to a method for recovering high-purity boric acid.

【0002】[0002]

【従来の技術】一般にニッケルメッキ液或いはアルミ表
面処理液中にはホウ素化合物(ホウ酸等)が含まれてお
り、これらを扱う工場においてはホウ素を含有する洗浄
排水が発生する。またガラス、釉薬、アルミコンデンサ
ー等ホウ素を使用する工場においてもホウ素を含む工場
排水が発生する。ホウ素化合物は植物にとっては必須微
量元素であり、海水には4〜5mg/L程度含まれてい
ることは周知のことである。一方、ホウ素が人体に与え
る影響は必ずしも明確ではないものの低濃度の継続摂取
において生殖機能の低下などの健康障害を起こす可能性
が指摘されている。平成11年2月、ホウ素の環境基準
として1mg/L以下が告示され、追って排水基準も定
められることになるものと予想されるため、これらのホ
ウ素を含む工程排水中のホウ素除去処理が必要となる。
2. Description of the Related Art In general, a nickel plating solution or an aluminum surface treatment solution contains a boron compound (boric acid or the like), and a factory which handles these compounds generates cleaning wastewater containing boron. In addition, factories that use boron, such as glass, glazes, and aluminum capacitors, also generate factory wastewater containing boron. It is well known that boron compounds are essential trace elements for plants, and that seawater contains about 4 to 5 mg / L. On the other hand, although the effects of boron on the human body are not always clear, it has been pointed out that continuous ingestion of low concentrations may cause health problems such as reduced reproductive function. In February 1999, 1 mg / L or less was announced as an environmental standard for boron, and it is expected that the effluent standard will be set in the future. Therefore, it is necessary to remove boron from process effluents containing these borons. Become.

【0003】ホウ素の除去方法としては、ホウ素含有排
水にアルミニウム化合物及びカルシウム化合物を用いて
凝集沈殿によりホウ素化合物を分離除去する方法(特公
昭58−15193号公報、同59−24876号公
報)或いはニッケルメッキ洗浄排水にマグネシウム塩を
添加して凝集沈殿によりホウ素を分離除去する方法等
(平成11年度東京都立産業技術研究所発表会予稿集P
52)が知られている。
As a method for removing boron, a method of separating and removing a boron compound by coagulation precipitation using an aluminum compound and a calcium compound in a boron-containing wastewater (Japanese Patent Publication Nos. 58-15193 and 59-24876) or nickel Method of separating and removing boron by coagulation sedimentation by adding magnesium salt to plating washing wastewater (1999 Tokyo Metropolitan Industrial Technology Research Institute Presentations P
52) are known.

【0004】しかし、ホウ素を不溶化させるために多量
の薬剤を使用する必要があり、発生汚泥も多くその処理
が困難であるという問題がある。更にこの方法ではアル
ミニウム、カルシウム或いはマグネシウム化合物が大量
に含まれており、ホウ素を再利用することは不可能であ
る。
However, it is necessary to use a large amount of chemicals for insolubilizing boron, and there is a problem that the generated sludge is large and its treatment is difficult. Furthermore, this method contains a large amount of aluminum, calcium or magnesium compounds, so that it is impossible to reuse boron.

【0005】またホウ素含有排水を陰イオン交換樹脂、
或いはホウ素選択吸着樹脂により吸着処理する方法も数
多く知られている(特許公報平2−32952号、その
他)。しかし、ホウ素含有水を、ホウ素を吸着するイオ
ン交換樹脂に通液させて処理した後、当該イオン交換樹
脂からホウ素を溶離するためには酸溶液を使用するた
め、再生した酸根を含むホウ素含有水の処理に課題を持
っている。
[0005] Further, the wastewater containing boron is anion-exchange resin,
Alternatively, a number of adsorption treatments using a boron selective adsorption resin are also known (Japanese Patent Application Laid-Open No. 2-32952, etc.). However, after the boron-containing water is passed through an ion exchange resin that adsorbs boron and treated, an acid solution is used to elute boron from the ion exchange resin. Have an issue in processing.

【0006】酸根を含むホウ素含有水の処理方法とし
て、溶離液を抽出剤と接触させてホウ素を抽出し、更に
逆抽出剤と接触させてホウ酸を逆抽出させ、晶析法によ
ってホウ素化合物を結晶化させる方法が知られている
(特公平1−50476号公報)。抽出剤としてはオク
チレングリコール、2−エチルヘキサノール等が知られ
ているが、これらは消防法で定める危険物であり処理設
備及び周辺の火気を避けることが必要であり取り扱いが
難しい。
As a method for treating boron-containing water containing acid radicals, an eluent is brought into contact with an extractant to extract boron, and further contacted with a back-extracting agent to back-extract boric acid. A method for crystallization is known (Japanese Patent Publication No. 1-50476). As the extractant, octylene glycol, 2-ethylhexanol, and the like are known, but these are dangerous substances specified by the Fire Service Law, and it is necessary to avoid treatment facilities and surrounding fire, and handling is difficult.

【0007】更に硫酸等の酸根を含むホウ素溶離液をア
ルカリで中和しホウ酸と硫酸の混合溶液の混合溶液と
し、硫酸ナトリウムとホウ酸の溶解度差を利用して分離
する方法も知られており(12695の化学商品P15
1他)、硫酸ナトリウム及びホウ酸を結晶(固体)して
回収することが出来る。しかし、この方法は濃縮するた
めの加熱、或いは結晶を発生させるための冷却を必要と
しており、結晶が伝熱間に付着すると伝熱効率を著しく
低下させる等の問題を持っている。
Further, a method is known in which a boron eluent containing an acid group such as sulfuric acid is neutralized with an alkali to form a mixed solution of a mixed solution of boric acid and sulfuric acid, and separation is carried out by utilizing the difference in solubility between sodium sulfate and boric acid. Ori (chemical product P15 of 12695)
1), sodium sulfate and boric acid can be recovered as crystals (solid). However, this method requires heating for concentrating or cooling for generating crystals, and has a problem that when the crystals adhere during heat transfer, the heat transfer efficiency is significantly reduced.

【0008】[0008]

【発明が解決しようとする課題】本発明の課題は、した
がってホウ素を含有する排水を通液してホウ素を吸着し
たイオン交換樹脂に酸溶液を通液してホウ素を溶離した
酸根を含むホウ素溶離液を中和してホウ酸と中性塩(例
えば硫酸ナトリウム)の溶解度差を利用して分離するに
当たり加熱、冷却時の結晶の発生、及び伝熱管への付着
防止を図ることにより、効率よくホウ酸と中性塩(例え
ば硫酸ナトリウム)の結晶を得るための方法を提供する
ことにある。
The object of the present invention is therefore to solve the problem of boron elution containing acid radicals in which an acid solution is passed through a boron-adsorbed ion-exchange resin through the passage of a wastewater containing boron to elute the boron. Efficient by neutralizing the liquid and separating by utilizing the difference in solubility between boric acid and neutral salt (for example, sodium sulfate), by heating and cooling, generating crystals during cooling, and preventing adhesion to heat transfer tubes. It is an object of the present invention to provide a method for obtaining crystals of boric acid and a neutral salt (for example, sodium sulfate).

【0009】[0009]

【課題を解決するための手段】本発明者は、上記課題を
解決するために各温度でのホウ酸−硫酸ナトリウム−水
における相互溶解度について鋭意研究を重ね、本発明を
完成させた。
Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have intensively studied the mutual solubility in boric acid-sodium sulfate-water at each temperature and completed the present invention.

【0010】すなわち本発明は、 (1) ホウ素を含有する排水を処理してホウ素を吸着
したイオン交換樹脂に硫酸溶液を通液して、ホウ素を溶
離した硫酸イオンを含むホウ素溶離液を用意する工程
と、このホウ素溶離液を中和し、ホウ酸と硫酸ナトリウ
ムの混合溶液にする工程と、この混合溶液を加熱及び冷
却してホウ酸と硫酸ナトリウムの溶解度差によりホウ酸
と硫酸ナトリウムとを分離して結晶化させる工程とを具
備したことを特徴とするホウ素溶離液からのホウ酸回収
方法。
That is, the present invention provides: (1) a boron eluate containing sulfate ions eluted with boron by treating a wastewater containing boron and passing a sulfuric acid solution through an ion-exchange resin to which boron has been adsorbed. Neutralizing the boron eluent to form a mixed solution of boric acid and sodium sulfate, and heating and cooling the mixed solution to convert boric acid and sodium sulfate by a difference in solubility between boric acid and sodium sulfate. A method of recovering boric acid from a boron eluent, comprising the steps of: separating and crystallizing.

【0011】(2) 硫酸ナトリウム、及びホウ酸の結
晶発生時に当該溶液を攪拌及び/又は循環して加熱又は
冷却用伝熱部分への結晶の付着を防止することを特徴と
する請求項1に記載のホウ素溶離液からのホウ酸回収方
法。
(2) When the crystals of sodium sulfate and boric acid are generated, the solution is agitated and / or circulated to prevent the crystals from adhering to the heat transfer portion for heating or cooling. A method for recovering boric acid from a boron eluent as described above.

【0012】(3) 酸根を含むホウ素溶離液を中和す
るに際しPHを7〜8に調整してホウ酸の溶解度を上げ
ることによりホウ酸の結晶化をコントロールすることを
特徴とする請求項1に記載の酸根を含むホウ素溶離液か
らのホウ酸回収方法である。
(3) The crystallization of boric acid is controlled by adjusting the pH to 7 to 8 to neutralize the boron eluent containing an acid group to increase the solubility of boric acid. 2. A method for recovering boric acid from a boron eluate containing an acid group as described in 1. above.

【0013】[0013]

【発明の実施の形態】ホウ酸−硫酸ナトリウム−水の相
互溶解度は図1に示される(化学便覧 基礎編 改訂4
版 P163及び166、Solubilities inorganic and
metal − organic compounds P272)。この図
で、実線で囲まれた範囲は、35℃でホウ酸と硫酸ナト
リウムとが相互に溶解する範囲で、破線で囲まれた範囲
は、75℃でホウ酸と硫酸ナトリウムとが相互に溶解す
る範囲で、本発明は、この図からもわかるように、温度
を下げると硫酸ナトリウムの溶解度が向上することを利
用している。以下、この図に基づいて本発明の考え方を
説明すると、黒丸はホウ酸と硫酸ナトリウムを含む出発
の反応液組成を示し、この反応液組成は、例えば、ホウ
素を含有する排水を通液してホウ素を吸着したイオン交
換樹脂に硫酸溶液を通液してホウ素を溶離した硫酸を含
むホウ素溶離液を中和して得られる。この反応液を70
℃〜75℃で加熱すると、次第に濃縮される(a点から
b点に至る右上がり急傾斜の2点鎖線(1))。この時点
では、実線及び破線に囲まれた範囲内にあるので、ホウ
酸、硫酸ナトリウムとも溶解された状態にあり、結晶に
はならない。濃縮が進行してb点に至ると硫酸ナトリウ
ムのみ飽和溶液となる。ここで、75℃に加熱維持しな
がら硫酸ナトリウムの溶解度線に沿って更に濃縮を続け
るとこの溶液は硫酸ナトリウムの結晶を発生しながら濃
縮される(b点からc点に至る右上がり緩傾斜の線
(2))。そして、c点に至るとホウ酸、及び硫酸ナトリ
ウムは飽和溶液になる。c点に至ったことは、比重など
により検出可能である。この時点で35℃〜40℃(例
えば35℃)に冷却する(c点からd点に至る水平線
(3))。硫酸ナトリウムの溶解度は温度低下により溶解
度が大きくなるため、75℃から35℃になっても結晶
は発生しない。一方、ホウ酸は75℃から35℃になる
と溶解度が大きく低下するためホウ酸が結晶化する。d
点に至るとホウ酸、硫酸ナトリウム共飽和溶液となるた
め新しい反応液と混合する(d点からa点に至る左下が
り急傾斜の線(4))。そしてa点まで希釈される。
BEST MODE FOR CARRYING OUT THE INVENTION The mutual solubility of boric acid-sodium sulfate-water is shown in FIG. 1 (Chemical Handbook, Basic Edition, Rev. 4).
Editions P163 and 166, Solubilities inorganic and
metal-organic compounds P272). In this figure, the range surrounded by a solid line is a range where boric acid and sodium sulfate are mutually dissolved at 35 ° C, and a range surrounded by a broken line is a range where boric acid and sodium sulfate are mutually dissolved at 75 ° C. As can be seen from this figure, the present invention utilizes the fact that the solubility of sodium sulfate increases as the temperature decreases. Hereinafter, the concept of the present invention will be described with reference to this figure.A black circle indicates a starting reaction solution composition containing boric acid and sodium sulfate, and the reaction solution composition is, for example, passed through a wastewater containing boron. It is obtained by passing a sulfuric acid solution through an ion-exchange resin on which boron is adsorbed to neutralize a boron eluent containing sulfuric acid in which boron has been eluted. This reaction solution is
When the mixture is heated at a temperature of from 75 ° C. to 75 ° C., it is gradually concentrated (a two-dot chain line (1) which rises to the right from point a to point b and rises steeply). At this point, since it is within the range surrounded by the solid line and the broken line, both boric acid and sodium sulfate are in a dissolved state and do not become crystals. When the concentration proceeds and reaches point b, only sodium sulfate becomes a saturated solution. Here, when the concentration is further continued along the solubility line of sodium sulfate while maintaining the temperature at 75 ° C., the solution is concentrated while generating crystals of sodium sulfate (from the point b to the point c, the solution gradually rises to the right and has a gentle slope. line
(2)). Then, at the point c, boric acid and sodium sulfate become a saturated solution. Reaching the point c can be detected by specific gravity or the like. At this point, cool down to 35 ° C to 40 ° C (for example, 35 ° C) (horizontal line from point c to point d).
(3)). Since the solubility of sodium sulfate increases as the temperature decreases, no crystals are generated even when the temperature is increased from 75 ° C to 35 ° C. On the other hand, the solubility of boric acid drops greatly from 75 ° C. to 35 ° C., so that boric acid crystallizes. d
When the point is reached, a boric acid / sodium sulfate co-saturated solution is formed and mixed with a new reaction solution (a line (4) with a steep left slope from point d to point a). Then, it is diluted to point a.

【0014】上記操作を続けることによりホウ素を含有
する排水を通液してホウ素を吸着したイオン交換樹脂に
例えば硫酸溶液を通液してホウ素を溶離した硫酸を含む
ホウ素溶離液からホウ酸及び硫酸ナトリウムを結晶とし
て分離することが出来る。
By continuing the above operation, a boric acid and a sulfuric acid are passed from a boron eluate containing sulfuric acid in which, for example, a sulfuric acid solution is passed through a boron-adsorbed ion-exchange resin by passing the wastewater containing boron to elute boron. Sodium can be separated as crystals.

【0015】この場合、硫酸ナトリウムとホウ酸の結晶
が発生する個所においては夫々の結晶が加熱、或いは冷
却用伝熱部分に付着すると伝熱効率を著しく低下させる
ため結晶の付着防止を図ることが重要である。具体的に
は、加熱時には、加熱に供される例えば伝熱管或いはス
チーム配管に付着することを防ぐため、濃縮液を激しく
攪拌する、或いは伝熱部に接触する液を停止させないよ
うに循環して、硫酸ナトリウムの結晶がこれらに付着し
ないようにするのがよい。冷却時には、冷却に供される
冷却管(冷却管の内部には例えば冷媒を循環している)
に付着しないよう激しく攪拌する、或いは伝熱部に接触
する液を停止させないように循環して、ホウ酸の結晶が
これらに付着しないようにすることが好適である。更に
は当該溶液のPHを7〜8にすることにより当該液中の
ホウ酸の溶解度が大きくなり、水平線(3)の段階では
ホウ酸の結晶発生が遅れるため伝熱部への付着が少なく
なる。dの時点で硫酸によりPHを4〜6に調整するす
ることによりホウ酸の溶解度が低下して大量のホウ酸の
結晶が発生するため、これを分離することによりホウ酸
と硫酸ナトリウムの分離が可能となる。なおこの際の母
液はホウ素溶離液と混合して再び上記操作を繰り返すこ
とにより、ホウ素溶離液中のホウ酸、及び硫酸ナトリウ
ムは100%回収が出来る。
In this case, when the crystals of sodium sulfate and boric acid are generated, if the crystals adhere to the heat transfer portion for heating or cooling, the heat transfer efficiency is remarkably reduced. It is. Specifically, at the time of heating, the concentrated liquid is vigorously stirred or circulated so as not to stop the liquid in contact with the heat transfer section, in order to prevent the liquid from contacting the heat transfer pipe or steam pipe provided for heating, for example. It is preferred that sodium sulfate crystals do not adhere to them. At the time of cooling, a cooling pipe provided for cooling (for example, a coolant is circulated inside the cooling pipe)
It is preferable to vigorously agitate the solution so as not to adhere thereto, or to circulate the solution in contact with the heat transfer section so as not to stop, so that boric acid crystals do not adhere to these. Further, by setting the pH of the solution to 7 to 8, the solubility of boric acid in the solution is increased, and in the stage of the horizontal line (3), the generation of boric acid crystals is delayed, so that the adhesion to the heat transfer portion is reduced. . By adjusting the pH to 4 to 6 with sulfuric acid at the time of d, the solubility of boric acid is reduced and a large amount of boric acid crystals are generated. By separating this, boric acid and sodium sulfate can be separated. It becomes possible. In this case, by mixing the mother liquor with the boron eluent and repeating the above operation again, 100% of boric acid and sodium sulfate in the boron eluent can be recovered.

【0016】回収したホウ酸は高純度ボロン系合金鉄の
原料としては勿論、ガラス、その他の原料として使用で
きるが、硫酸ナトリウムもガラス、合成洗剤等の原料、
或いは染色用として使用できる。
The recovered boric acid can be used not only as a raw material for high-purity boron-alloy iron, but also as glass and other raw materials. Sodium sulfate can also be used as a raw material for glass, synthetic detergents and the like.
Alternatively, it can be used for dyeing.

【0017】なお、図1は、本発明を分かりやすく説明
するためのもので、本発明は図1に示す加熱濃縮、冷却
の過程のみに限定するものではなく、本発明の技術思想
を逸脱しない範囲内で適宜修正、変更が可能である。
FIG. 1 is for the purpose of explaining the present invention in an easy-to-understand manner. The present invention is not limited to only the heating, concentration and cooling processes shown in FIG. 1 and does not depart from the technical idea of the present invention. Modifications and changes can be made as appropriate within the range.

【0018】以下、本発明の実施形態を図2の概要図を
使って具体的に説明する(この図では一重枠が液名を、
二重枠が処理工程を示す)。表1に示す組成を持つホウ
素を含有する排水を処理してホウ素を吸着したイオン交
換樹脂に硫酸溶液を通液してホウ素を溶離した硫酸イオ
ンを含むホウ素溶離液を、前回硫酸ナトリウムとホウ酸
を分離した母液と混合する(工程1)。この液にNaO
H溶液を添加し、PHを7〜8に調整する(工程2)。
この液を75〜80℃で加熱濃縮する(工程3)。この
場合、当該液を攪拌及び/又は循環させることにより、
硫酸ナトリウムの結晶が伝熱部分に付着することを防
ぐ。続いて、75〜80℃で遠心分離機の如き装置によ
り硫酸ナトリウムの結晶を分離する(工程4)。この
際、結晶を少量の水で洗浄することにより硫酸ナトリウ
ム結晶に付着した母液(ホウ酸、硫酸ナトリウムを含
む)を洗浄できる。なお洗浄液は濃縮液に混合する。引
き続いて、母液を35〜40℃に冷却する(工程5)。
この際、当該液を攪拌及び/又は循環させることによ
り、ホウ酸の結晶が伝熱部分に付着することを防ぐ。液
温が35〜40℃になった時点で硫酸溶液によりpH値
を4〜6に調整する(工程6)。このことにより、ホウ
酸の溶解度が低下し、結晶が生成するので、遠心分離機
の如き装置によりホウ酸の結晶を分離する(工程7)。
この際も結晶を少量の水で洗浄することによりホウ酸結
晶に付着した母液(硫酸ナトリウム、ホウ酸を含む)を
洗浄できる。なお洗浄液は濃縮液に混合する。この母液
を再びホウ素溶離液と混合してこの操作を繰り返す。こ
のようにして回収したホウ酸、及び硫酸ナトリウムの組
成は表2、3のとおりである。
Hereinafter, an embodiment of the present invention will be specifically described with reference to a schematic diagram of FIG. 2 (in this figure, a single frame indicates a liquid name,
Double frames indicate processing steps). The boron-containing eluate containing sulfate ions obtained by treating the wastewater containing boron having the composition shown in Table 1 and passing the sulfuric acid solution through the ion-exchange resin to which boron has been adsorbed to elute the boron, was previously subjected to sodium sulfate and boric acid. Is mixed with the separated mother liquor (Step 1). Add NaO to this solution
H solution is added to adjust the pH to 7-8 (step 2).
This solution is concentrated by heating at 75 to 80 ° C. (Step 3). In this case, by stirring and / or circulating the liquid,
Prevents sodium sulfate crystals from adhering to the heat transfer area. Subsequently, sodium sulfate crystals are separated by a device such as a centrifugal separator at 75 to 80 ° C (step 4). At this time, by washing the crystals with a small amount of water, the mother liquor (including boric acid and sodium sulfate) attached to the sodium sulfate crystals can be washed. The washing liquid is mixed with the concentrated liquid. Subsequently, the mother liquor is cooled to 35-40 ° C. (step 5).
At this time, by stirring and / or circulating the liquid, boric acid crystals are prevented from adhering to the heat transfer portion. When the liquid temperature reaches 35 to 40 ° C., the pH value is adjusted to 4 to 6 with a sulfuric acid solution (step 6). As a result, the solubility of boric acid decreases, and crystals are formed. Therefore, the crystals of boric acid are separated by a device such as a centrifugal separator (Step 7).
At this time, the mother liquor (including sodium sulfate and boric acid) attached to the boric acid crystal can be washed by washing the crystal with a small amount of water. The washing liquid is mixed with the concentrated liquid. The mother liquor is again mixed with the boron eluent and the procedure is repeated. The compositions of boric acid and sodium sulfate thus recovered are as shown in Tables 2 and 3.

【0019】回収したホウ酸は高純度ボロン系合金鉄の
原料としては勿論、ガラス、その他の原料として使用で
きるが、硫酸ナトリウムもガラス、合成洗剤等の原料、
或いは染色用として使用できる。
The recovered boric acid can be used not only as a raw material of high-purity boron-based ferroalloys, but also as a glass and other raw materials.
Alternatively, it can be used for dyeing.

【0020】[0020]

【表1】 [Table 1]

【0021】[0021]

【表2】 [Table 2]

【0022】[0022]

【表3】 [Table 3]

【0023】[0023]

【発明の効果】以上説明したように、本発明によれば、
ホウ素を含有する排水を処理してホウ素を吸着したイオ
ン交換樹脂に硫酸溶離液を通液してホウ素を溶離した硫
酸イオンを含むホウ素溶離液中和し、ホウ酸と硫酸ナト
リウムの混合溶液にした後、ホウ酸と硫酸ナトリウムの
溶解度差、及びPHによるホウ酸の溶解度の変化を利用
することによりホウ酸、硫酸ナトリウムを分離し結晶化
させることが出来る。
As described above, according to the present invention,
The wastewater containing boron was treated and the sulfuric acid eluent was passed through the ion-exchange resin to which the boron was adsorbed to neutralize the boron eluate containing the sulfate ions that eluted the boron to form a mixed solution of boric acid and sodium sulfate. Thereafter, boric acid and sodium sulfate can be separated and crystallized by utilizing the difference in solubility between boric acid and sodium sulfate and the change in solubility of boric acid due to PH.

【図面の簡単な説明】[Brief description of the drawings]

【図1】ホウ酸ー硫酸ナトリウムー水系における相互溶
解度を示すグラフにより本発明方法(加熱濃縮、冷却過
程)を説明した図。
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram illustrating the method of the present invention (heating concentration, cooling process) by a graph showing mutual solubility in a boric acid-sodium sulfate-water system.

【図2】本発明の操業方法の一例を示す概要ブロック
図。
FIG. 2 is a schematic block diagram showing an example of the operation method of the present invention.

───────────────────────────────────────────────────── 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) B01D 9/02 603 B01D 9/02 603C 614 614 620 620 625 625Z B01J 49/00 B01J 49/00 D G H ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat ゛ (Reference) B01D 9/02 603 B01D 9/02 603C 614 614 620 620 625 625Z B01J 49/00 B01J 49/00 DGH

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 ホウ素を含有する排水を処理してホウ素
を吸着したイオン交換樹脂に硫酸溶液を通液して、ホウ
素を溶離した硫酸イオンを含むホウ素溶離液を用意する
工程と、このホウ素溶離液を中和し、ホウ酸と硫酸ナト
リウムの混合溶液にする工程と、この混合溶液を加熱及
び冷却してホウ酸と硫酸ナトリウムの溶解度差によりホ
ウ酸と硫酸ナトリウムとを分離して結晶化させる工程と
を具備したことを特徴とするホウ素溶離液からのホウ酸
回収方法。
1. A step of treating a wastewater containing boron and passing a sulfuric acid solution through an ion-exchange resin to which boron has been adsorbed to prepare a boron eluate containing sulfate ions eluted with boron; Neutralizing the solution to form a mixed solution of boric acid and sodium sulfate, and heating and cooling the mixed solution to separate boric acid and sodium sulfate according to the solubility difference between boric acid and sodium sulfate to crystallize; And a method for recovering boric acid from a boron eluate.
【請求項2】 硫酸ナトリウム、及びホウ酸の結晶発生
時に当該溶液を攪拌及び/又は循環して加熱又は冷却用
伝熱部分への結晶の付着を防止することを特徴とする請
求項1に記載のホウ素溶離液からのホウ酸回収方法。
2. The method according to claim 1, wherein, when crystals of sodium sulfate and boric acid are generated, the solution is stirred and / or circulated to prevent the crystals from adhering to the heat transfer portion for heating or cooling. For recovering boric acid from a boron eluent.
【請求項3】 ホウ素溶離液を中和するに際しPHを7
〜8に調整してホウ酸の溶解度を上げることによりホウ
酸の結晶化をコントロールすることを特徴とする請求項
1に記載のホウ素溶離液からのホウ酸回収方法。
3. When neutralizing the boron eluent, adjust the pH to 7
The method for recovering boric acid from a boron eluate according to claim 1, wherein the crystallization of boric acid is controlled by increasing the solubility of boric acid by adjusting the value to ~ 8.
JP2000217631A 2000-07-18 2000-07-18 Method for recovering boric acid from boron eluate Pending JP2002029732A (en)

Priority Applications (1)

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JP2000217631A JP2002029732A (en) 2000-07-18 2000-07-18 Method for recovering boric acid from boron eluate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000217631A JP2002029732A (en) 2000-07-18 2000-07-18 Method for recovering boric acid from boron eluate

Publications (1)

Publication Number Publication Date
JP2002029732A true JP2002029732A (en) 2002-01-29

Family

ID=18712708

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2002029732A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101829655B1 (en) * 2017-11-08 2018-03-29 주식회사 코센코리아 Method for purifying polluted wash water used for cleaning exhaust gas of SCRUBBER for ship

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101829655B1 (en) * 2017-11-08 2018-03-29 주식회사 코센코리아 Method for purifying polluted wash water used for cleaning exhaust gas of SCRUBBER for ship

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