JP2764508B2 - Kiln dust processing system - Google Patents
Kiln dust processing systemInfo
- Publication number
- JP2764508B2 JP2764508B2 JP30562592A JP30562592A JP2764508B2 JP 2764508 B2 JP2764508 B2 JP 2764508B2 JP 30562592 A JP30562592 A JP 30562592A JP 30562592 A JP30562592 A JP 30562592A JP 2764508 B2 JP2764508 B2 JP 2764508B2
- Authority
- JP
- Japan
- Prior art keywords
- kiln
- slurry
- dust
- water
- adjuster
- 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
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、セメント製造装置に
おいて発生するキルン燃焼ガスのダストの処理システム
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for treating dust of kiln combustion gas generated in a cement manufacturing apparatus.
【０００２】[0002]
【従来の技術】アルカリ含有量の多いセメントを使う
と、アルカリと骨材が反応し、いわゆるアルカリ骨材反
応を起こしてコンクリ−トの亀裂、ヒビ割れなどが発生
する。2. Description of the Related Art When a cement containing a large amount of alkali is used, alkali and aggregate react with each other to cause a so-called alkali-aggregate reaction, which causes cracks and cracks in concrete.
【０００３】そこで、この問題を解決するためにアルカ
リバイパス方式が用いられている。この方式は、セメン
ト焼成工程の高温領域と低温領域の間を循環する揮散し
たガス状のアルカリを高温のキルン焼成ガスと一緒に系
外に抽出し、循環するアルカリ量を減らすことによっ
て、クリンカ中に取り込まれるアルカリ量を減少せしめ
るものである。[0003] To solve this problem, an alkali bypass system has been used. This method involves extracting volatile gaseous alkali circulating between the high-temperature region and low-temperature region of the cement firing process together with the high-temperature kiln firing gas to the outside of the system, and reducing the amount of circulating alkali to reduce the amount of circulating alkali. This is to reduce the amount of alkali taken into the water.
【０００４】[0004]
【発明が解決しようとする課題】従来のアルカリバイパ
ス方式では、セメント中のアルカリ含有量は確実に減少
するが、その反面、ダストの処理が問題となる。それ
は、キルン燃焼ガスのダスト発生量が多く、例えば、１
日に１０〜数１００ｔにも達する上、該ダストには表１
に示す様にアルカリ分の他鉛やカドミウムなどの有害な
重金属物質（いわゆる障害物質）が含まれている為であ
る。In the conventional alkali bypass system, the alkali content in cement is surely reduced, but on the other hand, there is a problem in the treatment of dust. This is because the amount of dust generated from the kiln combustion gas is large, for example, 1
In addition to 10 to several hundred tons per day, the dust contains
As shown in the figure, harmful heavy metal substances (so-called obstacle substances) such as lead and cadmium are contained in addition to alkali content.
【０００５】[0005]
【表１】 [Table 1]
【０００６】そのため、このダストの埋立、廃棄等によ
る処理方法は不可能である。[0006] Therefore, it is not possible to treat this dust by landfilling or disposal.
【０００７】本発明は上記事情に鑑み、キルンダストを
円滑に処理するとともに、その有効利用を図ることを目
的とする。SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to process kiln dust smoothly and to effectively use it.
【０００８】[0008]
【課題を解決するための手段】キルンダストに含まれる
カドミウム（ｃｄ）の様にＰＨ（ペ−ハ）が大きくなれ
ばなる程溶解度は小さくなるのが原則である。しかし、
キルンダスト中に含まれる鉛（Ｐｂ）はこの原則にあて
はまらず、溶解度（ｇ／ｌ）とＰＨとの関係は図３の様
になる。即ち、ＰｂではＰＨ９で溶解度が最小とり、逆
にこれ以上ＰＨが上昇すると溶解度も大きくなる。The principle is that the solubility increases as the PH (Peah) increases, as in the case of cadmium (cd) contained in kiln dust. But,
Lead (Pb) contained in kiln dust does not conform to this principle, and the relationship between solubility (g / l) and PH is as shown in FIG. That is, the solubility of Pb is minimized at PH9, and conversely, the solubility increases as the pH increases further.
【０００９】この様な事実から、本発明者は、ダスト中
に含まれている各重金属物質を除去するには、それぞれ
各重金属物質の最小溶解度になるようにＰＨを調整し、
沈殿させれば良いことに気がついた。そこで、本発明者
は、本発明を次の様に構成し、前記目的の達成を図っ
た。From the above facts, the inventor of the present invention has adjusted the pH so that each heavy metal substance contained in the dust can be removed so that each heavy metal substance has the minimum solubility.
I noticed that it should be allowed to settle. Therefore, the present inventor has configured the present invention as follows, and has achieved the above object.
【００１０】キルン燃焼ガスのダストに第１ＰＨ調整剤
を添加し、前記ダスト中の第１障害物質の沈殿に最適な
ＰＨの１次スラリ−にする工程と；該１次スラリ−中で
沈殿した第１障害物質を除去する工程と；前記１次スラ
リ−に第２ＰＨ調整剤を添加し、第２障害物質の沈殿に
最適なＰＨの２次スラリ−にする工程と；を備えている
ことを特徴とするキルンダストの処理システム。A step of adding a first pH adjuster to the dust of the kiln combustion gas to obtain a primary slurry having a pH optimum for the precipitation of the first obstacle substance in the dust; and a step of depositing the primary slurry in the primary slurry. Removing a first obstacle substance; and adding a second pH adjuster to the primary slurry to form a secondary slurry having a pH optimum for precipitation of the second obstacle substance. Characteristic kiln dust processing system.
【００１１】[0011]
【作用】キルンダストに第１ＰＨ調整剤、例えば、水を
添加し、第１障害物、例えば、Ｃｄの沈澱に最適なＰＨ
１２の１次スラリーにする。１次スラリー中のＣｄは沈
殿後除去し、セメント原料等に利用する。次に１次スラ
リーに第２ＰＨ調整剤、例えば、キルン排ガスを添加
し、第２障害物質、例えば、Ｐｂの最小溶解度のＰＨ９
の２次スラリーにする。そして、２次スラリー中のＰｂ
は沈殿後除去し、セメント原料等に利用する。The first pH adjuster, for example, water is added to the kiln dust, and the optimal pH for the precipitation of the first obstacle, for example, Cd.
Twelve primary slurries. Cd in the primary slurry is removed after precipitation and used as a raw material for cement and the like. Next, a second pH adjuster, for example, a kiln exhaust gas, is added to the primary slurry, and a second obstacle substance, for example, PH9 having a minimum solubility of Pb is added.
To a secondary slurry. And Pb in the secondary slurry
Is removed after settling and used as a raw material for cement.
【００１２】[0012]
【実施例】この発明の実施例を添付図面により説明する
と、セメント焼成キルン１からの高温キルン燃焼ガス
は、キルン窯尻ハウジング２を通り、仮焼炉付サスペン
ジョンプレヒータキルンの混合室３に入り、抽気系の仮
焼炉４からの燃焼ガスと混合し、プレヒータの最下段５
に入る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings. A high-temperature kiln combustion gas from a cement kiln 1 passes through a kiln bottom housing 2 and enters a mixing chamber 3 of a suspension preheater kiln with a calciner. Mixing with the combustion gas from the calcination furnace 4 of the bleeding system,
to go into.
【００１３】そして、ここで、原料と該ガスとが分離さ
れ、該ガスは次のサイクロン６に入り、又、原料はサイ
クロン部で捕集され、キルン窯尻ハンジング２を通りセ
メント焼成キルン１に入る。原料中の揮発成分、アルカ
リＲ2 Ｏ、硫黄酸化物ＳＯ3、並びに塩素Ｃｌ等はセメ
ント焼成キルン１中で、高温状態にさらされる。[0013] Then, the raw material and the gas are separated, and the gas enters the next cyclone 6, and the raw material is collected in the cyclone portion and passes through the kiln kiln bottom handling 2 to the cement firing kiln 1. enter. Volatile components, alkali R 2 O, sulfur oxide SO 3 , chlorine Cl and the like in the raw material are exposed to a high temperature in the cement kiln 1.
【００１４】この時、これら揮発成分は揮散し、ガス状
で燃焼ガスとともにキルン窯尻ハウジング２、混合室
３、最下段サイクロン５を通り次のサイクロン６に流れ
ていく。しかし、この途中、温度条件によって原料に凝
集、付着し、原料と一緒に最下段サイクロン５で捕集さ
れ、再び前記キルン１に送入される。At this time, these volatile components volatilize, and flow into the next cyclone 6 in the gaseous state through the kiln bottom housing 2, the mixing chamber 3, and the lowermost cyclone 5 together with the combustion gas. However, during this process, the raw material is agglomerated and adheres to the raw material depending on the temperature conditions, collected together with the raw material by the lowermost cyclone 5, and sent back to the kiln 1.
【００１５】この段に、Ｒ2 Ｏ、ＳＯ3 、Ｃｌ 等の揮
発成分は、キルン１と最下段サイクロン５或は次のサイ
クロン６との間を循環し、徐々にその原料中の濃度が高
まっていく。アルカリの場合、この循環割合は、原料中
のアルカリの３〜４倍になり、又、塩素の場合は、１５
〜３０倍程度になる事が一般に知られている。In this stage, volatile components such as R 2 O, SO 3 and Cl circulate between the kiln 1 and the lowermost cyclone 5 or the next cyclone 6, and the concentration in the raw material gradually increases. To go. In the case of alkali, the circulation ratio is 3 to 4 times that of the alkali in the raw material.
It is generally known that it becomes about 30 times.
【００１６】アルカリの場合、クリンカ中に硫酸アルカ
リ（Ｋ2 ＳＯ4 、Ｎａ2 ＳＯ4 ）、或は、炭酸アルカリ
（Ｒ2 ＣＯ3 ）という化合物を作り、前記キルン１から
排出されるが、塩素の場合、揮発率が高いので、ほとん
どクリンカ中にとりこまれず前記キルン１と最下段サイ
クロン５との間を循環し、種々工程上のトラブルを発生
させる。In the case of alkali, a compound called alkali sulfate (K 2 SO 4 , Na 2 SO 4 ) or alkali carbonate (R 2 CO 3 ) is formed in the clinker and discharged from the kiln 1. In this case, since the volatility is high, it is hardly taken into the clinker and circulates between the kiln 1 and the lowermost cyclone 5 to cause troubles in various processes.
【００１７】このキルン１と最下段サイクロン５との間
を循環する間から、即ち、窯尻ハウジング２からキルン
燃焼ガスの一部を抽気すれば循環するアルカリ量が減少
し、クリンカ中に取り込まれるアルカリ量を減らすこと
ができる。When the kiln 1 is circulated between the kiln 1 and the lowermost cyclone 5, that is, when a part of the kiln combustion gas is extracted from the kiln tail housing 2, the amount of circulating alkali decreases and is taken into the clinker. The amount of alkali can be reduced.
【００１８】前記キルン１から抽気された高温、例え
ば、約１０００〜１１００℃のキルン燃焼ガスは、図示
しない冷風吹込ファンによって冷風吹込口１７から入っ
た空気により、４００℃程度まで急速に冷却され、クー
リングタワ７内で更に散水によって１６０〜１８０℃迄
冷却される。The high-temperature kiln combustion gas extracted from the kiln 1, for example, about 1000 to 1100 ° C., is rapidly cooled to about 400 ° C. by air introduced from a cold-air blowing port 17 by a cold-air blowing fan (not shown). The cooling tower 7 is further cooled to 160 to 180 ° C. by spraying water.
【００１９】その後、該ガスはダスト集塵機９に入りダ
ストが除塵された後、図示しないファンを通り大気に放
出される。前記高温ガスに揮散中のアルカリ、硫黄、塩
素等は冷却されると凝縮し、該ガス中のダストに付着、
捕集される。それ故、前記キルン１からの該ガス中のア
ルカリは、クーリングタワ７迄の煙道中でダストに付着
し、クーリングタワ７内で散水によって冷却され、完全
に凝縮してダストに凝集、付着する。Thereafter, the gas enters the dust collector 9 where the dust is removed, and is discharged to the atmosphere through a fan (not shown). Alkali, sulfur, chlorine, etc., which are volatilizing in the high-temperature gas, condense when cooled, and adhere to dust in the gas,
Collected. Therefore, the alkali in the gas from the kiln 1 adheres to the dust in the flue up to the cooling tower 7, is cooled by water spray in the cooling tower 7, is completely condensed, and aggregates and adheres to the dust.
【００２０】クリ−ニングタワ７内で捕集されたキルン
ダストＤは下部の輸送機８を通り、また、集塵機９で捕
集されたキルンダストＤは下部の輸送機１０を通って水
槽１１に送られ、ここで第１ＰＨ調整剤５０、例えば、
水Ｗを添加され攪拌機１３にて攪拌されて１次スラリ−
となる。キルンダストＤと水Ｗとの割合は、水１ｍ3／
ｈｒに対しダスト１００ｋｇ／ｈｒ程度であるが、この
時のＰＨは１２である。このＰＨ１２では、下記表２の
水中の金属分析値、に示す様に、Ｐｂが２００ｍｇ／
ｌ、ＣｄがＮＤ即ち０である（同表Ｎｏ１参照）。即
ち、Ｃｄの溶解度が最小であるので１次スラリ−中のＣ
ｄは沈殿する。The kiln dust D collected in the cleaning tower 7 passes through the lower transport unit 8, and the kiln dust D collected by the dust collector 9 is sent to the water tank 11 through the lower transport unit 10. Here, the first PH adjuster 50, for example,
Water W is added and stirred by a stirrer 13 to form a primary slurry.
Becomes The ratio of kiln dust D to water W is 1 m 3 / water.
The dust is about 100 kg / hr with respect to hr, and the PH at this time is 12. In this PH12, as shown in Table 2 below, metal analysis value in water, Pb was 200 mg /
l and Cd are ND, that is, 0 (see No. 1 in the same table). That is, since the solubility of Cd is minimum, C in the primary slurry is
d precipitates.
【００２１】[0021]
【表２】 [Table 2]
【００２２】沈殿したＣｄを含む固形物は、水槽１１か
ら排出され、遠心分離機２０に送られ水と分離される。
水槽１１内の１次スラリ−は、フイルタ２１によりさら
に固形物が除去されながら水槽２２に送られる。このフ
ィルタ２１で除去されたＣｄを含む固形物は、前記遠心
分離機２０に送られる。The solid containing the precipitated Cd is discharged from the water tank 11 and sent to the centrifuge 20 to be separated from water.
The primary slurry in the water tank 11 is sent to the water tank 22 while the solids are further removed by the filter 21. The solid containing Cd removed by the filter 21 is sent to the centrifuge 20.
【００２３】前記水槽２２に第２ＰＨ調整剤５１、例え
ば、炭酸ガスＣＯ2 を添加し、攪半機２３にて攪半し２
次スラリーとする。このＣＯ2 の投入量を例えば、１６
ｍ3／ｈｒ程度にすると、ＰＨは９となり、表２のＮＯ
２に示す様に、Ｐｂが０．２ｍｇ／ｌ、Ｃｄが０とな
る。即ち、Ｐｂの溶解度が最小限であるのでＰｂが最も
多く沈澱した沈殿する。沈澱したＰｂを含む固形物は水
槽２２から排出され、セメント原料などに利用される。A second pH adjuster 51, for example, carbon dioxide gas CO 2 is added to the water tank 22, and the mixture is stirred by a stirrer 23.
Next slurry. The input amount of CO 2 is, for example, 16
When it is set to about m 3 / hr, PH becomes 9 and NO in Table 2
As shown in FIG. 2, Pb is 0.2 mg / l and Cd is 0. That is, since the solubility of Pb is minimum, Pb precipitates most frequently. The solid matter containing the precipitated Pb is discharged from the water tank 22 and used as a raw material for cement or the like.
【００２４】該スラリー中に沈殿するＰｂを除去した後
の水は重金属物質が除去されているので、軽量骨材製造
用の発泡剤として利用したり、或いは適当にＰＨを調整
してそのまま捨てることもできる。さらに、イオン交換
樹脂などを用いてアルカリを回収し、これを有効利用す
ることもできる。The water from which the Pb precipitated in the slurry has been removed is used as a foaming agent for the production of lightweight aggregates, or the water is discarded as it is because the heavy metal substances have been removed. Can also. Further, the alkali can be recovered by using an ion exchange resin or the like, and can be effectively used.
【００２５】遠心分離機２０内に投入されたＣｄを含む
固形物は、水Ｗと分離され、加熱器３０により加熱され
て水分が除去され、セメント原料３１に利用される。
又、水Ｗは水槽３２に送られ、そこで、第３ＰＨ調整剤
５３、例えば、ＣＯ2 を添加され攪半機３３により攪半
され、ＰＨ９の第３スラリーとなる。The solid matter containing Cd put into the centrifuge 20 is separated from the water W, heated by the heater 30 to remove the water, and used as the cement raw material 31.
Further, the water W is sent to the water tank 32, where the third PH adjuster 53, for example, CO 2 is added and stirred by the stirring machine 33 to become a third slurry of PH9.
【００２６】ここで、沈殿したＰｂを含む固形物は水槽
３２から排出され、セメント原料等に利用され、又、水
槽３２内の水Ｗは前記と同様に利用することができる。Here, the solid matter containing precipitated Pb is discharged from the water tank 32 and used as a raw material for cement and the like, and the water W in the water tank 32 can be used in the same manner as described above.
【００２７】この発明の実施例は上記に限定されるもの
ではなく、例えば、第１ＰＨ調整剤５０及び第２ＰＨ調
整剤５１として水、炭酸ガス、キルン排ガス、又は酸の
いずれか１つ以上を用いてもよい。キルン排ガスを用い
る場合、前記例で１次スラリーにキルン排ガスを５３ｍ
3 ／ｈｒ程度添加するとＰＨ９になる。The embodiment of the present invention is not limited to the above. For example, one or more of water, carbon dioxide, kiln exhaust gas, or acid may be used as the first PH regulator 50 and the second PH regulator 51. You may. In the case where kiln exhaust gas is used, the kiln exhaust gas is 53 m in the primary slurry in the above example.
Addition of about 3 / hr results in PH9.
【００２８】又、１次スラリーに酸（Ｈ2 ＳＯ4 ）を、
７０ｋｇ／ｈｒ程度添加すると、ＰＨ９になる。An acid (H 2 SO 4 ) is added to the primary slurry,
When about 70 kg / hr is added, the pH becomes 9.
【００２９】第２スラリーにＰＨ制御向上剤を添加し、
ＰＨの値が急激に変化しないようにしながら調整しても
よい。このＰＨ制御向上剤として、アンモニア水溶液の
様な弱塩基、又は緩衝液、が用いられる。Adding a pH control improver to the second slurry,
The adjustment may be performed while preventing the PH value from changing abruptly. As the pH control improving agent, a weak base such as an aqueous ammonia solution or a buffer solution is used.
【００３０】この向上剤として、アンモニア水溶液を用
いる場合には、１０％アンモニア水溶液を２５ｋｇ／ｈ
ｒを添加し、又、緩衝液、例えば、ＮａＢ4 Ｏ7 ・１０
Ｈ2Ｏを用いる場合には、３．８ｋｇ／ｈｒ程度添加す
るが、この場合ＰＨ９程度で制御性が向上する。When an aqueous ammonia solution is used as this improver, a 10% aqueous ammonia solution is added at 25 kg / h.
r, and a buffer such as NaB 4 O 7 · 10
When H 2 O is used, about 3.8 kg / hr is added. In this case, controllability is improved at about PH9.
【００３１】さらに、第２スラリにＣＯ2、キルン排ガ
ス、硫酸などを用いてＰＨ程度を調整した後水を加えＰ
Ｈ９に制御するようにしても良い。Further, the pH of the second slurry is adjusted using CO 2 , kiln exhaust gas, sulfuric acid or the like, and then water is added.
H9 may be controlled.
【００３２】前記実施例における第１スラリーに溶解度
積の小さい沈殿促進材を添加し、第１スラリー中の重金
属物質の沈殿促進化を図ってもよい。この沈殿促進材と
して、例えば、硫化物や炭酸塩、硫酸塩が用いられる。A precipitation promoting material having a small solubility product may be added to the first slurry in the above embodiment to promote the precipitation of heavy metal substances in the first slurry. For example, a sulfide, a carbonate, or a sulfate is used as the precipitation promoting material.
【００３３】第１スラリーに添加される沈殿材は、硫化
物、例えば、Ｎａ2 Ｓでは、０．１ｋｇ／ｈｒ程度、
又、炭酸塩、例えば、Ｎａ2ＣＯ3 では、６０ｋｇ／ｈ
ｒ程度であるが、これにより、Ｐｂ、Ｃｄが表２のＮｏ
３、Ｎｏ４の通り変化する。即ち、硫化物では、Ｐｂ、
ＣｄともにＮＤ、沈殿剤ではＰｂが０．５、Ｃｄが０．
０５、である。The precipitant added to the first slurry is a sulfide, for example, about 0.1 kg / hr for Na 2 S.
In the case of a carbonate, for example, Na 2 CO 3 , 60 kg / h
r, the Pb and Cd are set to No.
3. It changes as No.4. That is, in sulfide, Pb,
Both Cd are ND, and the precipitant has Pb of 0.5 and Cd of 0.5.
05.
【００３４】以上主としてＰｂ、Ｃｄの処理について説
明したが、この発明は上記実施例に限らずクロム、ヒ
素、銅、亜鉛、マンガン、などの処理の当たってもＰＨ
を調整し最適溶解度とすることで同様の処理をすること
ができる。Although the treatment of Pb and Cd has mainly been described above, the present invention is not limited to the above embodiment, and the treatment of chromium, arsenic, copper, zinc, manganese and the like can be performed even if the treatment is performed.
The same processing can be carried out by adjusting the value of to obtain the optimum solubility.
【００３５】[0035]
【発明の効果】この発明は以上の様に構成したので、キ
ルンダストに含まれる重金属物質等を除去するととも
に、それらの物質をセメント原料等に利用することがで
きる。又、その際、発生する水は重金属物質等を含んで
いないので、ＰＨ調整後排水として捨てても公害問題を
発生することがないが、これをそのまま軽量骨材製造の
発泡剤に利用することもできる。As described above, the present invention can remove heavy metal substances and the like contained in kiln dust and can use those substances as a cement raw material and the like. In addition, since the generated water does not contain heavy metal substances, etc., it does not cause a pollution problem even if it is disposed of as wastewater after pH adjustment. However, it should be used as it is as a foaming agent for manufacturing lightweight aggregates. Can also.
【図１】本発明の実施例の前半を示すフローチャートで
ある。FIG. 1 is a flowchart showing a first half of an embodiment of the present invention.
【図２】本発明の実施例の後半を示すフローチャートで
ある。FIG. 2 is a flowchart showing the second half of the embodiment of the present invention.
【図３】重金属物質の溶解度とＰＨとの関係を示す図で
ある。FIG. 3 is a diagram showing a relationship between solubility of heavy metal substances and PH.
１ キルン １１ 水槽 ２２ 水槽 ３２ 水槽 ５０ 第１ＰＨ調整剤 ５１ 第２ＰＨ調整剤 ５３ 第３ＰＨ調整剤 DESCRIPTION OF SYMBOLS 1 Kiln 11 Water tank 22 Water tank 32 Water tank 50 1st PH adjuster 51 2nd PH adjuster 53 3rd PH adjuster
Claims (8)
を添加し、前記ダスト中の第１障害物質の沈殿に最適な
ＰＨの１次スラリ−にする工程と；該１次スラリ−中で
沈殿した第１障害物質を除去する工程と；前記１次スラ
リ−に第２ＰＨ調整剤を添加し、第２障害物質の沈殿に
最適なＰＨの２次スラリ−にする工程と；を備えている
ことを特徴とするキルンダストの処理システム。1. A step of adding a first pH adjuster to dust of a kiln combustion gas to obtain a primary slurry having a pH optimum for precipitation of a first obstacle substance in the dust; Removing a precipitated first obstacle substance; and adding a second pH adjuster to the primary slurry to form a secondary slurry having a pH optimum for precipitation of the second obstacle substance. A kiln dust processing system, characterized in that:
質の最小溶解度のＰＨであることを特徴とする請求項１
記載のキルンダストの処理システム。2. The pH optimum for precipitation of an obstacle is the pH of the minimum solubility of the obstacle.
A kiln dust processing system as described.
排ガス、又は、酸のいずれか１つ以上であることを特徴
とする請求項１記載のキルンダストの処理システム。3. The kiln dust treatment system according to claim 1, wherein the first pH adjuster is at least one of water, carbon dioxide, kiln exhaust gas, and acid.
排ガス、又は、酸のいずれか１つ以上であることを特徴
とする請求項１記載のキルンダストの処理システム。4. The kiln dust treatment system according to claim 1, wherein the second pH adjuster is any one or more of water, carbon dioxide, kiln exhaust gas, and acid.
ことを特徴とする請求項１記載のキルンダストの処理シ
ステム。5. The kiln dust treatment system according to claim 1, wherein a pH control improver is added to the secondary slurry.
のいずれか１つであることを特徴とする請求項５記載の
キルンダストの処理システム。6. The kiln dust treatment system according to claim 5, wherein the pH control improving agent is any one of a weak base and a buffer.
ラリ−にする工程と；該１次スラリ−中で沈殿した第１
障害物質を除去する工程と；前記スラリ−に第２障害物
質の沈殿促進剤を添加する工程と；を備えていることを
特徴とするキルンダストの処理システム。7. A process in which water is added to dust of the kiln combustion gas to form a slurry; a first slurry precipitated in the primary slurry.
A kiln dust treatment system, comprising: a step of removing an obstacle substance; and a step of adding a precipitation accelerator for a second obstacle substance to the slurry.
塩のいずれか１つ以上であることを特徴とする請求項７
記載のキルンダストの処理システム。8. The method according to claim 7, wherein the precipitation accelerator is at least one of a sulfide, a carbonate, and a sulfate.
A kiln dust processing system as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30562592A JP2764508B2 (en) | 1992-11-16 | 1992-11-16 | Kiln dust processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30562592A JP2764508B2 (en) | 1992-11-16 | 1992-11-16 | Kiln dust processing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06157089A JPH06157089A (en) | 1994-06-03 |
| JP2764508B2 true JP2764508B2 (en) | 1998-06-11 |
Family
ID=17947390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30562592A Expired - Lifetime JP2764508B2 (en) | 1992-11-16 | 1992-11-16 | Kiln dust processing system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2764508B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035630A1 (en) | 2004-09-29 | 2006-04-06 | Taiheiyo Cement Corporation | System and method for treating dust in gas extracted from cement kiln combustion gas |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK1795510T3 (en) * | 2004-09-29 | 2014-06-16 | Taiheiyo Cement Corp | Gas dust extraction system and method taken from cement kiln combustion gas |
| JP5225541B2 (en) * | 2005-03-17 | 2013-07-03 | 宇部興産株式会社 | Cement clinker, cement manufacturing method and apparatus |
| EP1935477B1 (en) | 2005-08-26 | 2015-05-27 | Taiheiyo Cement Corporation | Apparatus and method for dissolution/reaction |
| JP5085027B2 (en) * | 2005-10-17 | 2012-11-28 | 住友大阪セメント株式会社 | Method and apparatus for treating chlorine-containing waste |
| US8282263B2 (en) | 2005-10-31 | 2012-10-09 | Taiheiyo Cement Corporation | Apparatus and method for adding wet ash to cement |
| JPWO2007066534A1 (en) | 2005-12-07 | 2009-05-14 | 太平洋セメント株式会社 | Apparatus and method for removing unburned carbon in fly ash |
| CN101528953B (en) | 2006-10-24 | 2011-10-19 | 太平洋水泥株式会社 | Method for removing lead from cement kiln |
| US8439202B2 (en) | 2006-12-05 | 2013-05-14 | Taiheiyo Cement Corporation | Coal ash treatment method and apparatus |
| JP5854499B2 (en) * | 2011-10-14 | 2016-02-09 | 太平洋セメント株式会社 | Chlorine bypass exhaust gas treatment method |
| JP5475739B2 (en) * | 2011-10-21 | 2014-04-16 | Ｊｘ日鉱日石金属株式会社 | Cement dust treatment method |
-
1992
- 1992-11-16 JP JP30562592A patent/JP2764508B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035630A1 (en) | 2004-09-29 | 2006-04-06 | Taiheiyo Cement Corporation | System and method for treating dust in gas extracted from cement kiln combustion gas |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06157089A (en) | 1994-06-03 |
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