JPH1076247A - Method for desalting cement kiln exhaust gas dust - Google Patents
Method for desalting cement kiln exhaust gas dustInfo
- Publication number
- JPH1076247A JPH1076247A JP8234356A JP23435696A JPH1076247A JP H1076247 A JPH1076247 A JP H1076247A JP 8234356 A JP8234356 A JP 8234356A JP 23435696 A JP23435696 A JP 23435696A JP H1076247 A JPH1076247 A JP H1076247A
- Authority
- JP
- Japan
- Prior art keywords
- dust
- washing
- filtrate
- water
- filter
- 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.)
- Granted
Links
- 239000000428 dust Substances 0.000 title claims abstract description 75
- 239000004568 cement Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000011033 desalting Methods 0.000 title claims description 7
- 238000005406 washing Methods 0.000 claims abstract description 69
- 239000000706 filtrate Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 150000003839 salts Chemical class 0.000 claims abstract description 27
- 239000013505 freshwater Substances 0.000 claims description 6
- 229910001385 heavy metal Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 8
- 239000007787 solid Substances 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 description 24
- 239000000460 chlorine Substances 0.000 description 17
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 10
- 229910052801 chlorine Inorganic materials 0.000 description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000010612 desalination reaction Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006114 decarboxylation reaction Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、セメントキルン排
ガス中のダスト（以下排ガスダスト或いはダストという
ことがある）の脱塩方法に関し、より詳しくは、塩素バ
イパス或いはアルカリバイパス（以下塩素バイパスとい
う）と呼ばれる装置を用いてセメントキルンから塩分を
排ガスダストとともに抜き出すことによりクリンカー中
の塩素含有量を低減させる技術において、得られる排ガ
スダストの水洗による脱塩方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for desalting dust (hereinafter sometimes referred to as "exhaust gas dust" or "dust") in an exhaust gas of a cement kiln, and more particularly to a chlorine bypass or an alkali bypass (hereinafter referred to as "chlorine bypass"). TECHNICAL FIELD The present invention relates to a technique for reducing the chlorine content in clinker by extracting salt from a cement kiln together with exhaust gas dust using a device called a desalination method by washing the obtained exhaust gas dust with water.
【０００２】[0002]
【従来の技術】従来産業廃棄物、都市ゴミなどの廃棄物
をセメント製造の燃料乃至原料として多量に使用する場
合には、これらの廃棄物中に多量に含まれる塩素により
プレヒーターへのコーチングが増加して操業状態が不安
定となったり、或いはクリンカー中の塩素分が増加して
セメント組成がJIS規格から逸脱したりするという問題
を生じている。この様な事態を回避するために、セメン
トキルンに塩素バイパスと呼ばれるバイパス経路を設け
ることにより、塩分が付着したダストを排ガスとともに
系外に抜き出すことが行われている（特開昭62-252351
号公報、特開昭63-265847号公報など参照）。抜き出し
た排ガスダストは、そのまま廃棄処分したり、或いは水
で洗浄して塩分を除去した後、原料として再びキルンに
リサイクルすることも行われている。しかしながら、こ
れらの公報に記載された技術においては、水による洗浄
についての具体的な方法乃至装置に関しては、明らかに
されていない。また、ダストの洗浄に際し多量に発生す
る洗浄廃水の処理に関しても、セメント系固化材製造用
の原料成形水として再利用することが知られているに過
ぎない（特開平7-277786号公報参照）。2. Description of the Related Art Conventionally, when wastes such as industrial wastes and municipal wastes are used in a large amount as fuels or raw materials for cement production, a large amount of chlorine contained in these wastes makes it possible to coach a preheater. There is a problem that the operating condition becomes unstable due to the increase and the chlorine content in the clinker increases and the cement composition deviates from the JIS standard. In order to avoid such a situation, a cement kiln is provided with a bypass path called a chlorine bypass, whereby dust with salt attached thereto is extracted out of the system together with exhaust gas (Japanese Patent Application Laid-Open No. 62-252351).
Reference, JP-A-63-265847, etc.). The extracted exhaust gas dust is sometimes disposed of as it is, or washed with water to remove salts, and then recycled to the kiln as a raw material. However, in the techniques described in these publications, a specific method or apparatus for cleaning with water is not disclosed. Also, with respect to the treatment of washing wastewater generated in large amounts during dust cleaning, it is only known to reuse it as raw material forming water for the production of cement-based solidified material (see Japanese Patent Application Laid-Open No. 7-277786). .
【０００３】排ガスダストの水洗浄において、ダストに
対して多量の水を使用すれば、洗浄後のダストに残留す
る塩分は確かに低下するが、同時に洗浄濾液が大量に発
生するので、これを蒸発乾固させるために多量のエネル
ギーを必要とすることになる。一方、洗浄水が少量であ
る場合には、ダストに高塩分濃度の液が残留して、再び
多量の塩分がキルンに戻されることになり、洗浄効果か
極めて低く、抜き出すべき排ガスダストの量も多くなら
ざるを得ない。その結果、設備の容量が大きくなった
り、エネルギーロスが大きくなったりする。[0003] When a large amount of water is used for washing the exhaust gas dust with water, the salt remaining in the dust after the washing is certainly reduced, but at the same time, a large amount of washing filtrate is generated. A large amount of energy is required to dry. On the other hand, when the amount of washing water is small, a high salt concentration liquid remains in the dust, and a large amount of salt is returned to the kiln again.The washing effect is extremely low, and the amount of exhaust gas dust to be extracted is also low. I have to be more. As a result, the capacity of the equipment increases and the energy loss increases.
【０００４】また、排ガスダストは、脱炭酸反応がほぼ
終了した状態にあるので、水に触れると、アルカリ性を
呈し、含まれている鉛などの両性有害重金属も塩分とと
もに溶出してくる。従って、排ガスダストの洗浄濾液を
蒸発乾固して回収した塩も、そのままでは重金属を含む
ので、有効利用し難い。[0004] Further, since the exhaust gas dust is in a state where the decarboxylation reaction is almost completed, when it comes into contact with water, it exhibits alkalinity, and the contained amphoteric harmful heavy metals such as lead are eluted together with the salt. Therefore, the salt collected by evaporating the washing filtrate of the exhaust gas dust to dryness contains a heavy metal as it is, so that it is difficult to effectively use the salt.
【０００５】[0005]
【発明が解決しようとする課題】従って、本発明は、少
ない水量で洗浄を効率良く行って排ガスダストから塩分
を除去することができ、洗浄後のダストとともにキルン
に戻される塩分量を減少させ、しかも洗浄濾液を蒸発乾
固して回収される塩分を有効に利用することを可能とす
る新たな技術を提供することを主な目的とする。SUMMARY OF THE INVENTION Accordingly, the present invention is capable of efficiently performing washing with a small amount of water to remove salt from exhaust gas dust, reducing the amount of salt returned to the kiln together with the dust after washing, In addition, it is a main object of the present invention to provide a new technique that makes it possible to effectively utilize the salt recovered by evaporating and drying the washing filtrate.
【０００６】[0006]
【課題を解決するための手段】本発明者は、上記のよう
な技術の現状を考慮して研究を重ねた結果、セメントキ
ルン排ガスダストの洗浄を複数段階で行う場合には、従
来技術の問題点を著しく軽減しうることを見出した。As a result of repeated studies in consideration of the above-mentioned state of the art as described above, the present inventor has found that when cleaning exhaust gas from a cement kiln in a plurality of stages is a problem of the prior art. It has been found that the points can be significantly reduced.
【０００７】すなわち、本発明は、下記のセメントギル
ン排ガスの脱塩方法を提供するものである： １．セメントキルン排ガス中のダストを抜き出し、ダス
トを水で洗浄して脱塩する方法において、ダストの洗浄
を複数段階（ｎ段階；ｎ≧２）で行い、ダストの最初の
洗浄段階で使用した水を濾過して塩類を回収するととも
に、最終段階のダスト洗浄において新水により洗浄を行
い、その濾液を順次前段のダスト洗浄段階における洗浄
水としてリサイクル使用することを特徴とするセメント
キルン排ガスダストの脱塩方法。That is, the present invention provides the following method for desalination of exhaust gas of cement giln: In a method of extracting dust from the exhaust gas of a cement kiln, washing the dust with water and desalting, the dust is washed in a plurality of stages (n stages; n ≧ 2), and water used in the first washing stage of the dust is removed. Desalting of cement kiln exhaust gas, characterized by filtering and recovering salts, washing with fresh water in the last stage dust washing, and sequentially recycling the filtrate as washing water in the previous dust washing stage Method.
【０００８】２．最初の洗浄段階後に回収する濾液のpH
を低下させることにより、濾液中の重金属を水酸化物と
して沈殿させて除去し、有用物を回収利用する上記項１
に記載のセメントキルン排ガスダストの脱塩方法。[0008] 2. PH of the filtrate collected after the first washing step
Wherein the heavy metal in the filtrate is precipitated and removed as a hydroxide to recover and utilize useful substances.
Desalination method for cement kiln exhaust gas described in 1 above.
【０００９】[0009]
【発明の実施の形態】本発明が対象とする排ガスダスト
は、クリンカー中に取り込まれる塩素或いはアルカリ量
を低減させるために、塩素バイパス装置によってセメン
トキルンから抜き出されるダストである限り、特に限定
されない。塩素バイパス装置も、特に限定されず、一例
として、セメントキルン窯尻近傍からバイパス経路によ
ってキルン排ガスとともにダストを抜き出し、これに冷
気を吹き込むことにより気化状態にある塩化物などのガ
スをダスト表面に凝縮・付着させ、集塵器でダストとと
もに捕集して系外に取り出す形式の装置を挙げることが
できる。BEST MODE FOR CARRYING OUT THE INVENTION The exhaust gas dust to which the present invention is applied is not particularly limited as long as it is dust extracted from a cement kiln by a chlorine bypass device in order to reduce the amount of chlorine or alkali taken into clinker. . The chlorine bypass device is also not particularly limited.As an example, dust is extracted together with the kiln exhaust gas from the vicinity of the cement kiln kiln tail by a bypass path, and gas such as chloride in a vaporized state is condensed on the dust surface by blowing cool air into the device. -An example of a device that adheres, collects together with dust with a dust collector, and takes it out of the system.
【００１０】以下図面を参照しつつ、本発明をさらに詳
細に説明する。Hereinafter, the present invention will be described in more detail with reference to the drawings.
【００１１】本発明においては、ダストの洗浄を複数段
階（少なくとも２段階；以下主に２段階での洗浄につい
て説明する）で行う。図１に示すように、セメントキル
ンから排ガスとともに抜き出されたダストは、洗浄槽１
において、後述する濾過器４から循環される濾液からな
る洗浄水により一次洗浄された後、洗浄水とともに濾過
器２に送られ、ここで濾液から分離される。洗浄槽とし
ては、特に限定されるものではないが、通常撹拌洗浄槽
などが使用される。また、濾過器としても、制限されな
いが、通常フィルタープレスなどが使用される。In the present invention, the cleaning of dust is performed in a plurality of stages (at least two stages; hereinafter, the two-stage cleaning will be mainly described). As shown in FIG. 1, dust extracted together with exhaust gas from the cement kiln is supplied to a cleaning tank 1.
In the above, after being primarily washed with washing water composed of a filtrate circulated from a filter 4 described later, it is sent to the filter 2 together with the washing water, where it is separated from the filtrate. The washing tank is not particularly limited, but a stirring washing tank or the like is usually used. Although the filter is not limited, a filter press or the like is usually used.
【００１２】回収された濾液は、常法に従って、放流さ
れるか或いは所定の処理（蒸発乾固など）後固形物の形
態で廃棄される。The collected filtrate is discharged according to a conventional method, or is discarded in a solid form after a predetermined treatment (evaporation to dryness).
【００１３】次いで、一次洗浄後のダストは、第二の洗
浄槽３に送られ、ここで新水により二次洗浄された後、
洗浄水とともに第二の濾過器４に送られ、ここで濾液か
ら分離される。Next, the dust after the primary cleaning is sent to a second cleaning tank 3, where the dust is secondarily cleaned with fresh water.
It is sent to the second filter 4 together with the washing water, where it is separated from the filtrate.
【００１４】濾過器４で得られた洗浄済みダストは、常
法に従って、キルンに戻し、セメント原料の一部として
再利用することができる。The washed dust obtained in the filter 4 can be returned to a kiln and reused as a part of a cement raw material according to a conventional method.
【００１５】第二の濾過器４で得られる濾液は、第二の
洗浄槽３における洗浄対象であるダストがすでに一次洗
浄されていることおよび洗浄槽３での洗浄液が新水であ
ることにより、未だ高度の洗浄力を有しているので、本
発明では、これを洗浄槽１に循環して、ダストの一次洗
浄液として利用する。The filtrate obtained in the second filter 4 is obtained by the fact that the dust to be washed in the second washing tank 3 has already been primarily washed and the washing liquid in the washing tank 3 is fresh water. Since it still has a high degree of cleaning power, in the present invention, it is circulated to the cleaning tank 1 and used as a primary cleaning liquid for dust.
【００１６】この様な複数段階での洗浄という本発明の
構成により、ダスト洗浄に必要な水量が減少するととも
に、ダストの洗浄が効率良く行われるので、洗浄済みダ
ストをキルンへ戻す場合にも、多量の塩分がキルンに循
環されることもない。According to the configuration of the present invention of washing in a plurality of stages, the amount of water required for dust washing is reduced and the dust is efficiently washed. Therefore, even when the washed dust is returned to the kiln, Large amounts of salt are not recycled to the kiln.
【００１７】一次洗浄および二次洗浄のいずれの場合に
も、洗浄水の量は、例えば、ダスト量の0.5〜10倍程度
（重量比）の範囲にある。従って、濾過器２からの回収
濾液に見合う量の新水を洗浄槽３に供給使用すればよ
い。洗浄水の量が多すぎる場合には、洗浄水の繰り返し
使用による効果が失われて、従来の１回洗浄の場合と同
程度の低い塩分除去効率にとどまるとともに、多量の洗
浄濾液が発生してしまう。これに対し、洗浄水の量が少
なすぎる場合には、洗浄が困難となり、繰り返し洗浄を
行っても、ダストに残留する塩分量が多くなって、洗浄
の効率が低下する。洗浄水の量は、より好ましくは、ダ
スト量の約2倍程度である。In both cases of the primary cleaning and the secondary cleaning, the amount of cleaning water is, for example, in the range of about 0.5 to 10 times (weight ratio) the amount of dust. Therefore, the amount of fresh water that matches the recovered filtrate from the filter 2 may be supplied to the washing tank 3 and used. If the amount of the washing water is too large, the effect of repeated use of the washing water is lost, and the salt removal efficiency is as low as the conventional one-time washing, and a large amount of washing filtrate is generated. I will. On the other hand, if the amount of the washing water is too small, the washing becomes difficult, and even if the washing is repeated, the amount of salt remaining in the dust increases, and the washing efficiency is reduced. The amount of washing water is more preferably about twice the amount of dust.
【００１８】図２に３段階以上の洗浄操作を行う場合の
フローを示す。この場合には、第一の濾過器２と第二の
洗浄槽３との間に、少なくとも１つの中間洗浄槽と少な
くとも１つの中間濾過器とを配置する。図３において、
例えばｎ≧３の場合、すなわち、３段階の洗浄操作を行
う場合には、濾過器４から送られてきた濾液を中間洗浄
槽１３に送り、一次洗浄を終えたダストを中間洗浄す
る。中間洗浄されたダストは、中間濾過器１４を経て洗
浄槽３に送られ、前記と同様にさらに洗浄処理と濾過処
理に供される。一方、中間濾過器１４から回収された濾
液は、第一の洗浄槽１にリサイクルされ、ダストの一次
洗浄に使用される。３段階以上の洗浄操作を行う場合に
も、洗浄水の量は、例えば、ダスト量の0.5〜10倍程度
の範囲とすれば良い。FIG. 2 shows a flow chart in the case where three or more washing operations are performed. In this case, at least one intermediate washing tank and at least one intermediate filter are arranged between the first filter 2 and the second washing tank 3. In FIG.
For example, when n ≧ 3, that is, when performing a three-stage washing operation, the filtrate sent from the filter 4 is sent to the intermediate washing tank 13, and the dust after the primary washing is intermediately washed. The dust that has been subjected to the intermediate cleaning is sent to the cleaning tank 3 via the intermediate filter 14, and further subjected to the cleaning treatment and the filtration treatment as described above. On the other hand, the filtrate collected from the intermediate filter 14 is recycled to the first washing tank 1 and used for primary washing of dust. Even when three or more washing operations are performed, the amount of washing water may be, for example, in the range of about 0.5 to 10 times the amount of dust.
【００１９】ダストの洗浄回数は、特に限定されるもの
ではないが、洗浄効率、設備費などを考慮して、２〜３
段階で洗浄することが経済上有利である。The number of times of cleaning of the dust is not particularly limited, but may be 2 to 3 in consideration of cleaning efficiency, equipment cost, and the like.
It is economically advantageous to wash in stages.
【００２０】図３に示す実施態様は、基本的な操作にお
いては、図１に示す実施態様と変わりはない。この実施
態様においては、pH調整槽５において、酸（例えば、硫
酸、塩酸、硝酸、キルン排ガス中のCO2など）を濾過器
２からの回収濾液に添加して、そのpHを低下させること
により、濾液中のPbなどの重金属を水酸化物の形態で沈
殿させた後、濾過器６で濾別除去し、次いで濾液を乾燥
機７で乾燥して、有用成分を回収する。添加する酸とし
ては、硫酸がより好ましい。酸の濃度は、回収濾液のpH
を低下させることができ、且つ濾液の液量を著しく増大
させないものであれば、特に限定されない。The embodiment shown in FIG. 3 is similar in basic operation to the embodiment shown in FIG. In this embodiment, an acid (eg, sulfuric acid, hydrochloric acid, nitric acid, CO 2 in kiln exhaust gas, etc.) is added to the recovered filtrate from the filter 2 in the pH adjusting tank 5 to lower the pH. After precipitating heavy metals such as Pb in the filtrate in the form of a hydroxide, the precipitate is filtered off with a filter 6 and then the filtrate is dried with a dryer 7 to recover useful components. As the acid to be added, sulfuric acid is more preferable. The acid concentration depends on the pH of the recovered filtrate.
Is not particularly limited as long as it can reduce the amount of the filtrate and does not significantly increase the amount of the filtrate.
【００２１】回収濾液に含まれる主な重金属であるPb
は、両性金属であり、ダスト洗浄濾液の様な高アルカリ
性液中では、HPbO2 -の様なイオンとなって溶解してい
る。しかるに、この様な濾液のpHを中性近傍まで低下さ
せると、Pbを水酸化物として沈殿除去することができ
る。また、濾液中のCa2+やSO4 2-も、石膏として沈殿
し、除去される。その結果、濾液を蒸発乾固して得られ
る塩類は、高純度のKCl、NaClなどを主とするものであ
り、有効に利用できる。Pb which is the main heavy metal contained in the recovered filtrate
Is amphoteric metal, in such highly alkaline solution of dust washing filtrate, HPbO 2 - are dissolved become of such ions. However, when the pH of such a filtrate is lowered to near neutrality, Pb can be precipitated and removed as a hydroxide. In addition, Ca 2+ and SO 4 2- in the filtrate also precipitate as gypsum and are removed. As a result, the salts obtained by evaporating the filtrate to dryness are mainly composed of high-purity KCl, NaCl and the like, and can be used effectively.
【００２２】[0022]
【発明の効果】本発明によれば、セメントキルン排ガス
中のダストの洗浄を少量の水で効率良く行うことができ
る。According to the present invention, dust in the exhaust gas from a cement kiln can be efficiently cleaned with a small amount of water.
【００２３】また、回収される濾液の塩分濃度をその溶
解限度まで高めることができるので、濾液の蒸発乾固に
よる有用な塩類の回収に要するエネルギーも少なくて済
む。In addition, since the salt concentration of the recovered filtrate can be increased to its solubility limit, less energy is required for recovering useful salts by evaporating the filtrate to dryness.
【００２４】さらに、洗浄済みのダスト中の塩分濃度が
低いので、これをキルンに戻しても、随伴する塩分によ
る弊害も、軽減される。Further, since the salt concentration in the washed dust is low, even if the dust is returned to the kiln, the adverse effect due to the accompanying salt is reduced.
【００２５】回収された塩類は、石鹸製造などのための
油脂加工原料、ガラス製造原料、肥料原料などとして有
用である。The recovered salts are useful as raw materials for processing fats and oils for producing soap, raw materials for producing glass, raw materials for fertilizers, and the like.
【００２６】[0026]
【実施例】以下に実施例を示し、本発明の特徴とすると
ころをより一層明確にする。EXAMPLES Examples are shown below to further clarify the features of the present invention.
【００２７】実施例１〜４および比較例１〜２ 図１または図２にフローを示すプロセスにより、２段階
洗浄（実施例１、３）または３段階洗浄（実施例２、
４）による本発明方法を実施した。すなわち、セメント
キルン窯尻から塩素バイパス装置により抜き出されたダ
スト（Cl-濃度４．３％）を水：ダスト＝２：１（実施
例１、２）と水：ダスト＝５：１（実施例３、４）の比
率となる様に、濾過器２から濾液を回収しつつ且つ洗浄
槽３に新水を補給しつつ、それぞれ洗浄した。Examples 1-4 and Comparative Examples 1-2 Two-step cleaning (Examples 1, 3) or three-step cleaning (Example 2,
The method of the invention according to 4) was carried out. That is, dust (Cl - concentration: 4.3%) extracted from the cement kiln kiln tail by a chlorine bypass device was used for water: dust = 2: 1 (Examples 1 and 2) and water: dust = 5: 1 (implementation). Washing was performed while collecting the filtrate from the filter 2 and replenishing the washing tank 3 with fresh water so as to obtain the ratios of Examples 3 and 4).
【００２８】濾過器２において回収した濾液中のＣｌ−
濃度を測定し、ダストから濾液へ移行したCl-抽出率を
算出した。結果を表１に示す。The Cl − in the filtrate recovered in the filter 2
To determine the concentration, Cl has shifted to the filtrate from dust - was calculated extraction rate. Table 1 shows the results.
【００２９】また、比較として、ダスト（Cl-濃度4.3
％）を水：ダスト＝２：１（比較例１）と水：ダスト＝
５：１（比較例２）の比率となる様に、水量を調整しつ
つ、ダストを１回洗浄した後、回収した濾液中のCl-濃
度を測定し、ダストから濾液へ移行したCl-抽出率を算
出した。結果を表１に併せて示す。As a comparison, dust (Cl - concentration 4.3
%) As water: dust = 2: 1 (Comparative Example 1) and water: dust =
5: 1 as a ratio of (Comparative Example 2), while adjusting the amount of water, after washing the dust once, Cl in the recovered filtrate - extraction - to determine the concentration, Cl having transferred to the filtrate from the dust The rate was calculated. The results are shown in Table 1.
【００３０】[0030]
【表１】 [Table 1]
【００３１】表１に示す結果において、実施例１、２と
比較例１および実施例３、４と比較例２とを対比すれ
ば、ダストの複数回洗浄を行う本発明方法による優れた
Cl-除去効果が明らかである。In the results shown in Table 1, when Examples 1 and 2 are compared with Comparative Example 1 and Examples 3 and 4 are compared with Comparative Example 2, excellent results can be obtained by the method of the present invention in which dust is washed a plurality of times.
The Cl - removal effect is obvious.
【００３２】実施例５〜７ 実施例１で得られた回収濾液に1N硫酸を加えてpH9（実
施例５）或いはpH7（実施例６）に調整し、濾過した
後、濾液を蒸発乾固して得られた塩類を分析した。結果
を表２に示す。Examples 5 to 7 The recovered filtrate obtained in Example 1 was adjusted to pH 9 (Example 5) or pH 7 (Example 6) by adding 1N sulfuric acid, filtered, and the filtrate was evaporated to dryness. The resulting salts were analyzed. Table 2 shows the results.
【００３３】また、実施例７として、実施例１で得られ
た回収濾液のpH調整を行うことなくそのまま蒸発乾固し
て得られた塩類を分析した。結果を表２に併せて示す。In Example 7, salts obtained by evaporating and drying the recovered filtrate obtained in Example 1 without adjusting the pH were analyzed. The results are shown in Table 2.
【００３４】[0034]
【表２】 [Table 2]
【００３５】表２に示す結果から明らかな様に、回収濾
液のpHを低下させた後、蒸発乾固を行う場合（実施例５
および６）には、得られる塩中のPb含有量を大幅に低減
させることができる。As is evident from the results shown in Table 2, the pH of the recovered filtrate was lowered and then evaporated to dryness (Example 5).
In (6) and (6), the Pb content in the obtained salt can be significantly reduced.
【図１】本発明の実施態様の一例を示すフローチャート
である。FIG. 1 is a flowchart illustrating an example of an embodiment of the present invention.
【図２】本発明の実施態様の他の一例を示すフローチャ
ートである。FIG. 2 is a flowchart showing another example of the embodiment of the present invention.
【図３】本発明の実施態様のさらに他の一例を示すフロ
ーチャートである。FIG. 3 is a flowchart showing still another example of the embodiment of the present invention.
１…洗浄槽 ２…濾過器 ３…洗浄槽 ４…濾過器 ５…pH調整槽 ６…濾過器 ７…乾燥機 １３…洗浄槽 １４…濾過器 DESCRIPTION OF SYMBOLS 1 ... Cleaning tank 2 ... Filter 3 ... Cleaning tank 4 ... Filter 5 ... pH adjustment tank 6 ... Filter 7 ... Dryer 13 ... Cleaning tank 14 ... Filter
───────────────────────────────────────────────────── フロントページの続き (72)発明者 國西 健史 大阪府大阪市大正区南恩加島７丁目１番55 号 住友大阪セメント株式会社セメント・ コンクリート研究所内 (72)発明者 小出 貴夫 大阪府大阪市大正区南恩加島７丁目１番55 号 住友大阪セメント株式会社セメント・ コンクリート研究所内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Kuninishi 7-55 Minamienkajima Taisho-ku, Osaka-shi, Osaka Sumitomo Osaka Cement Co., Ltd. Cement and Concrete Research Laboratory (72) Inventor Takao Koide Osaka 7-55 Minamienkajima, Taisho-ku, Osaka Sumitomo Osaka Cement Co., Ltd.
Claims (2)
し、ダストを水で洗浄して脱塩する方法において、ダス
トの洗浄を複数段階（ｎ段階；ｎ≧２）で行い、ダスト
の最初の洗浄段階で使用した水を濾過して塩類を回収す
るとともに、最終段階のダスト洗浄において新水により
洗浄を行い、その濾液を順次前段のダスト洗浄段階にお
ける洗浄水としてリサイクル使用することを特徴とする
セメントキルン排ガスダストの脱塩方法。1. A method for extracting dust from exhaust gas of a cement kiln, washing the dust with water, and desalting the dust in a plurality of stages (n stages; n ≧ 2), wherein the dust is first washed. A cement kiln characterized in that the water used in the above step is filtered to recover salts, the final step of dust washing is performed with fresh water, and the filtrate is sequentially recycled as washing water in the preceding dust washing step. Desalting method of exhaust gas dust.
下させることにより、濾液中の重金属を水酸化物として
沈殿させて除去し、有用物を回収利用する請求項１に記
載のセメントキルン排ガスダストの脱塩方法。2. The cement kiln according to claim 1, wherein the pH of the filtrate recovered after the first washing step is lowered to precipitate and remove heavy metals in the filtrate as hydroxide, thereby recovering and utilizing useful substances. Desalting method of exhaust gas dust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23435696A JP3333910B2 (en) | 1996-09-04 | 1996-09-04 | Desalting method of exhaust gas dust of cement kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23435696A JP3333910B2 (en) | 1996-09-04 | 1996-09-04 | Desalting method of exhaust gas dust of cement kiln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1076247A true JPH1076247A (en) | 1998-03-24 |
| JP3333910B2 JP3333910B2 (en) | 2002-10-15 |
Family
ID=16969728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23435696A Expired - Fee Related JP3333910B2 (en) | 1996-09-04 | 1996-09-04 | Desalting method of exhaust gas dust of cement kiln |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3333910B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11278888A (en) * | 1998-03-26 | 1999-10-12 | Taiheiyo Cement Corp | Production of cement |
| JP2000167529A (en) * | 1998-12-08 | 2000-06-20 | Sumieito Kk | Separation of water soluble component from exhaust gas dust or incineration ash |
| JP2001079507A (en) * | 1999-09-16 | 2001-03-27 | Shinko Pantec Co Ltd | Equipment for cleaning and treating waste and method for cleaning waste |
| JP2001293454A (en) * | 2000-04-14 | 2001-10-23 | Kurita Water Ind Ltd | Method for extracting heavy metal and method for measuring elution of heavy metal |
| WO2007046325A1 (en) * | 2005-10-17 | 2007-04-26 | Sumitomo Osaka Cement Co., Ltd. | Method and equipment for the disposal of chlorine-containing waste |
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| JP2013086071A (en) * | 2011-10-21 | 2013-05-13 | Jx Nippon Mining & Metals Corp | Treatment method of cement dust |
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1996
- 1996-09-04 JP JP23435696A patent/JP3333910B2/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11278888A (en) * | 1998-03-26 | 1999-10-12 | Taiheiyo Cement Corp | Production of cement |
| JP2000167529A (en) * | 1998-12-08 | 2000-06-20 | Sumieito Kk | Separation of water soluble component from exhaust gas dust or incineration ash |
| JP2001079507A (en) * | 1999-09-16 | 2001-03-27 | Shinko Pantec Co Ltd | Equipment for cleaning and treating waste and method for cleaning waste |
| JP2001293454A (en) * | 2000-04-14 | 2001-10-23 | Kurita Water Ind Ltd | Method for extracting heavy metal and method for measuring elution of heavy metal |
| KR101291831B1 (en) * | 2005-10-17 | 2013-07-31 | 재팬 워터 시스템즈 코포레이션 | Method and equipment for the disposal of chlorine-containing waste |
| US8048314B2 (en) | 2005-10-17 | 2011-11-01 | Sumitomo Osaka Cement Co., Ltd. | Method for treating chlorine-containing waste |
| WO2007046325A1 (en) * | 2005-10-17 | 2007-04-26 | Sumitomo Osaka Cement Co., Ltd. | Method and equipment for the disposal of chlorine-containing waste |
| JP2008000689A (en) * | 2006-06-22 | 2008-01-10 | Kobe Steel Ltd | Treatment method and treatment apparatus of waste |
| JP4584874B2 (en) * | 2006-06-22 | 2010-11-24 | 株式会社神戸製鋼所 | Waste treatment method and treatment apparatus |
| JP2013086071A (en) * | 2011-10-21 | 2013-05-13 | Jx Nippon Mining & Metals Corp | Treatment method of cement dust |
| JP2013209254A (en) * | 2012-03-30 | 2013-10-10 | Jx Nippon Mining & Metals Corp | Treatment method for cement dust |
| JP2019130435A (en) * | 2018-01-29 | 2019-08-08 | 株式会社日立製作所 | Biomass modification apparatus and operational method therefor |
| CN109530332A (en) * | 2018-12-18 | 2019-03-29 | 广东拉多美化肥有限公司 | High tower equipment cleaning water cyclic utilization system and its circulation utilization method |
| CN109530332B (en) * | 2018-12-18 | 2024-02-27 | 拉多美科技集团股份有限公司 | High tower equipment cleaning water recycling system and recycling method thereof |
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