JP2003192407A - Method of producing cement for reducing mercury in raw material - Google Patents

Method of producing cement for reducing mercury in raw material

Info

Publication number
JP2003192407A
JP2003192407A JP2001388420A JP2001388420A JP2003192407A JP 2003192407 A JP2003192407 A JP 2003192407A JP 2001388420 A JP2001388420 A JP 2001388420A JP 2001388420 A JP2001388420 A JP 2001388420A JP 2003192407 A JP2003192407 A JP 2003192407A
Authority
JP
Japan
Prior art keywords
mercury
cement
gas
raw material
compounds
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
JP2001388420A
Other languages
Japanese (ja)
Inventor
Junichi Terasaki
淳一 寺崎
Yasuhiro Uchiyama
康広 内山
Osamu Yamaguchi
修 山口
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.)
Taiheiyo Cement Corp
Original Assignee
Taiheiyo Cement Corp
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 Taiheiyo Cement Corp filed Critical Taiheiyo Cement Corp
Priority to JP2001388420A priority Critical patent/JP2003192407A/en
Publication of JP2003192407A publication Critical patent/JP2003192407A/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/364—Avoiding environmental pollution during cement-manufacturing

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Ecology (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Public Health (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Sludge (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for reducing mercury and mercury compounds such as mercury contained in raw materials used for producing cement. <P>SOLUTION: Raw materials used for producing cement are introduced into a heating furnace, and mercury and mercury compounds contained in the raw materials are gasified. The high temperature gas is introduced into an adsorption part, and mercury and mercury compounds are adsorbed, and are separated from the gas, so that the concentration of mercury and mercury compounds in the raw materials is reduced. A thermal exhaust gas in the process of producing cement can be utilized for the heating. Further, as an adsorption material, an acid solution and/or an oxidizing solution, a porous substance, sulfur and/or metallic sulfur, and metals reacted with mercury can be utilized. <P>COPYRIGHT: (C)2003,JPO

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、セメント製造に使
用する原料中の水銀および水銀化合物を効率よく除去し
て、セメント製造工程内および排出ガスの水銀濃度を低
減するセメントの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing cement by efficiently removing mercury and mercury compounds in raw materials used for producing cement to reduce the mercury concentration in the cement production process and in exhaust gas.

【０００２】[0002]

【従来の技術】セメント製造において、各種汚泥、焼却
灰などの廃棄物を原料や燃料として使用する機会が増え
ている。しかし、これらの廃棄物に重金属が多少なりと
も含有されており、このためセメント製造工程に持ち込
まれる重金属の量が増大することが懸念される。これら
の廃棄物に含まれる重金属類のうち、揮発性が比較的高
い水銀および水銀化合物は、セメント製造工程の高温部
において揮発し、水銀蒸気としてガス中に含有される。
その後、ガスの温度が低下するのに伴いガス中に含有さ
れるダストの表面に水銀が析出し、あるいはその化合物
の微粒子となる。これらのダストや微粒子は煙道の電気
集塵機（ＥＰ）で捕集され、排ガスから除去される。し
かし、水銀は一部がガス状のまま残存し、排煙に含有さ
れたまま排出される。2. Description of the Related Art In cement production, there are increasing opportunities to use various sludges, incinerator ash and other waste materials as raw materials and fuels. However, these wastes contain some heavy metals, which may increase the amount of heavy metals brought into the cement manufacturing process. Of the heavy metals contained in these wastes, mercury and mercury compounds, which have relatively high volatility, volatilize in the high temperature part of the cement manufacturing process and are contained in the gas as mercury vapor.
Then, as the temperature of the gas decreases, mercury is deposited on the surface of the dust contained in the gas or becomes fine particles of the compound. These dusts and particles are collected by the flue gas electrostatic precipitator (EP) and removed from the exhaust gas. However, mercury remains partly in a gaseous state and is discharged while being contained in the flue gas.

【０００３】また、水銀および水銀化合物を含む集塵ダ
ストはセメント製造工程において、新たに粉砕された原
料に混ぜられて原料の一部となり、集塵ダストに含まれ
る水銀および水銀化合物は、一部がクリンカに含まれ、
大部分がプレヒータ部あるいはロータリーキルンの高温
部で再び揮発し、ガス中に含有されて再び排ガス系に導
かれ、セメント製造工程内を循環している。このため原
料に含まれる水銀および水銀化合物のセメント製造工程
内への持ち込みを低減する手段を設けないと、原料から
持ち込まれる水銀および水銀化合物が増大するのに伴
い、セメント製造工程内の循環量が増加し、系外に排出
される水銀が増えるという問題がある。Further, in the cement manufacturing process, dust and dust containing mercury and a mercury compound are mixed with newly crushed raw material and become a part of the raw material, and mercury and a mercury compound contained in the dust and dust are partially included. Is included in the clinker,
Most of it is volatilized again in the preheater part or the high temperature part of the rotary kiln, is contained in the gas, is led again to the exhaust gas system, and is circulated in the cement manufacturing process. Therefore, unless measures are provided to reduce the amount of mercury and mercury compounds contained in the raw materials brought into the cement manufacturing process, the amount of circulation in the cement manufacturing process will increase as the amount of mercury and mercury compounds brought in from the raw materials increases. There is a problem that the amount of mercury is increased and the amount of mercury discharged from the system increases.

【０００４】[0004]

【発明が解決しようとする課題】水銀および水銀化合物
を取り除いた原料をセメント製造工程内に投入すること
によって、セメント製造工程内および排ガス中の水銀の
濃度は低減できる。原料から水銀および水銀化合物を取
り除く方法としては、原料を加熱することによって水銀
および水銀化合物を気化させて蒸気とし、この水銀を含
む通気ガスを冷却することによって、金属水銀として凝
縮させ、取り除く方法が考えられる。しかし、原料中の
水銀および水銀化合物の濃度は非常に低いため、多くの
原料を処理し、かつ／または通気ガス量を減らすことに
よって、通気ガス中の濃度を高めても、効率よく水銀を
回収することは困難であり、水銀を含んだガスを大気に
排出する恐れがある。The concentration of mercury in the cement manufacturing process and in the exhaust gas can be reduced by introducing the raw material from which mercury and mercury compounds have been removed into the cement manufacturing process. As a method of removing mercury and a mercury compound from a raw material, a method of vaporizing mercury and a mercury compound by heating the raw material to form vapor, and cooling a vent gas containing this mercury to condense and remove it as metallic mercury is a method. Conceivable. However, since the concentrations of mercury and mercury compounds in the raw materials are very low, even if the concentration in the ventilation gas is increased by treating many raw materials and / or reducing the amount of ventilation gas, mercury can be recovered efficiently. It is difficult to do so, and gas containing mercury may be emitted to the atmosphere.

【０００５】[0005]

【課題を解決するための手段】本発明は、このようなセ
メント製造工程に使用する原料の水銀および水銀化合物
を効率よく除去する方法を提供する。本発明のセメント
製造方法は、原料を加熱することによって水銀および水
銀化合物をガス化して原料と分離し、セメント焼成系内
に水銀および水銀化合物の流入を防ぎ、水銀を含むガス
を吸着部に導入することによって効率よく水銀および水
銀化合物を回収し、大気への排出を防ぐ方法である。The present invention provides a method for efficiently removing the raw material mercury and mercury compounds used in such a cement manufacturing process. The method for producing cement of the present invention, by heating the raw material to gasify the mercury and the mercury compound and separate them from the raw material, prevent the inflow of mercury and the mercury compound into the cement firing system, and introduce the gas containing mercury into the adsorption part. This is a method of efficiently recovering mercury and mercury compounds and preventing their release into the atmosphere.

【０００６】すなわち、本発明は以下の構成からなるセ
メント製造における原料の水銀および水銀化合物の低減
法に関する。 （１）セメント製造に使用する原料を加熱炉に導き、原
料に含まれる水銀および水銀化合物をガス化し、この高
温ガスを吸着部に導いて水銀および水銀化合物を吸着
し、ガス中から分離することによって、原料中の水銀お
よび水銀化合物の濃度を低減し、その原料をセメント製
造工程に導いてセメントクリンカを焼成することを特徴
とするセメント製造方法。 （２）高温ガス中の水銀を吸着部で吸着した後、このガ
スを加熱炉内に再導入することによって、水銀の系外排
出を防止する上記（１）のセメント製造方法。 （３）セメント製造工程において排出された熱排ガスに
よって加熱炉を加熱する上記（１）または（２）のセメ
ント製造方法。 （４）前記吸着部に導入する吸着材を酸性溶液および／
または酸化性溶液とする（１）〜（３）のいずれかのセ
メント製造方法。 （５）前記吸着部に導入する吸着材を多孔質物質とする
（１）〜（３）のいずれかのセメント製造方法。 （６）前記吸着部に導入する吸着材を硫黄および／また
は金属硫化物とする（１）〜（３）のいずれかのセメン
ト製造方法。 （７）前記吸着部に導入する吸着材を水銀と反応する金
属とする（１）〜（３）のいずれかのセメント製造方
法。That is, the present invention relates to a method of reducing the raw materials mercury and mercury compounds in cement production having the following constitution. (1) Lead the raw materials used for cement production to a heating furnace, gasify the mercury and mercury compounds contained in the raw materials, and lead this high-temperature gas to the adsorption section to adsorb the mercury and mercury compounds and separate them from the gas. A method for producing cement, which comprises reducing the concentration of mercury and mercury compounds in the raw material, guiding the raw material to the cement production process, and firing the cement clinker. (2) The method for producing cement according to the above (1), which prevents mercury from being discharged from the system by re-introducing this gas into the heating furnace after adsorbing mercury in the high-temperature gas at the adsorption section. (3) The cement manufacturing method according to (1) or (2), wherein the heating furnace is heated by the heat exhaust gas discharged in the cement manufacturing process. (4) The adsorbent to be introduced into the adsorption unit is an acidic solution and / or
Or the cement manufacturing method in any one of (1)-(3) which makes it an oxidizing solution. (5) The method for producing cement according to any of (1) to (3), wherein the adsorbent introduced into the adsorbing section is a porous substance. (6) The method for producing cement according to any of (1) to (3), wherein the adsorbent introduced into the adsorption section is sulfur and / or metal sulfide. (7) The cement manufacturing method according to any one of (1) to (3), wherein the adsorbent introduced into the adsorption section is a metal that reacts with mercury.

【０００７】[0007]

【発明の実施の形態】以下、本発明を実施形態に基づい
て具体的に説明する。本発明の処理方法は、セメント製
造に使用する原料を加熱炉に導き、原料に含まれる水銀
および水銀化合物の揮発温度以上に加熱し、水銀および
水銀化合物をすべて蒸気とする。この蒸気を含む高温ガ
スを吸着部に導いて、水銀および水銀化合物を吸着し、
ガス中から分離し、その原料をセメント製造工程に導い
てセメントクリンカを焼成することを特徴とするセメン
ト製造方法である。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below based on embodiments. In the treatment method of the present invention, the raw materials used for cement production are introduced into a heating furnace and heated to a temperature above the volatilization temperature of mercury and mercury compounds contained in the raw materials to turn all the mercury and mercury compounds into vapor. The high temperature gas containing this vapor is guided to the adsorption section to adsorb mercury and mercury compounds,
It is a method for producing cement, which is characterized in that it is separated from the gas and the raw material thereof is introduced into the cement production process to burn the cement clinker.

【０００８】本発明に係わる処理方法の概略を図１に示
す。図示するように、本発明の処理系等には、セメント
製造工程の原料を原料ライン１０を通じて受け入れる加
熱炉３０、加熱炉３０から排出された高温ガスから水銀
および水銀化合物を吸着する吸着部３１、吸着部３１か
ら排出されたガスを送り出す吸引ファン３２が設けられ
ている。セメント焼成キルンなどの製造工程では、原料
は、粉砕機２０に導入され、所定の粒度に粉砕される。
本発明の対象となる原料は、セメント製造工程で使用す
る原料であれば何れでも良く、特に水銀、または塩化物
などの水銀化合物を含有している原料を優先的に処理す
る。これらの原料を加熱炉３０に導入する。加熱炉３０
は、例えば内部にスクリューフィーダ３０ａを備えたも
のが好ましい。加熱炉３０の一端から送入された原料が
炉内を搬送される間に水銀および水銀化合物の揮発温度
以上に加熱され、水銀および水銀化合物が蒸気となる。
具体的には概ね３００〜５００℃に加熱するのが好まし
い。因みに１ｍｍＨｇの蒸気圧を生じる温度は、水銀が
約１２６℃、塩化水銀が約１３６℃である。従って、３
００〜５００℃の加熱下において概ねこれらが揮発す
る。ただし、装置上の制約が許す限り、これ以上の高温
でもガス化には問題ない。また、加熱炉での処理時間を
長くすることが可能ならば、３００℃より低い温度で処
理しても良い。この加熱源はセメント焼成キルン等のセ
メント製造工程から排出された熱排ガスなどを利用する
と良い。水銀および水銀化合物がガス化した後の原料
は、加熱炉３０の排出口から取り出される。An outline of the processing method according to the present invention is shown in FIG. As shown in the figure, the treatment system of the present invention includes a heating furnace 30 that receives the raw materials of the cement manufacturing process through the raw material line 10, an adsorption unit 31 that adsorbs mercury and mercury compounds from the high temperature gas discharged from the heating furnace 30, A suction fan 32 that sends out the gas discharged from the adsorption unit 31 is provided. In a manufacturing process such as a cement firing kiln, raw materials are introduced into a crusher 20 and crushed to a predetermined particle size.
The raw material to be the subject of the present invention may be any raw material used in the cement manufacturing process, and particularly raw materials containing mercury or a mercury compound such as chloride are preferentially treated. These raw materials are introduced into the heating furnace 30. Heating furnace 30
Is preferably equipped with, for example, a screw feeder 30a inside. The raw material fed from one end of the heating furnace 30 is heated to a temperature above the volatilization temperature of mercury and a mercury compound while being transported in the furnace, and the mercury and the mercury compound become vapor.
Specifically, it is preferable to heat to approximately 300 to 500 ° C. Incidentally, the temperature at which a vapor pressure of 1 mmHg is generated is about 126 ° C. for mercury and about 136 ° C. for mercury chloride. Therefore, 3
These are mostly volatilized under heating at 00 to 500 ° C. However, as long as the restrictions on the equipment allow it, there is no problem in gasification at higher temperatures. If the treatment time in the heating furnace can be extended, the treatment may be performed at a temperature lower than 300 ° C. As the heating source, it is preferable to use the heat exhaust gas discharged from the cement manufacturing process such as the cement burning kiln. The raw material after the mercury and the mercury compound are gasified is taken out from the outlet of the heating furnace 30.

【０００９】加熱炉から排出された高温ガスは吸着部３
１に導入される。吸着部に用いる吸着材としては、例え
ば酸性溶液および／または酸化性溶液、多孔質物質、硫
黄および／または金属硫化物、水銀と反応する金属がよ
い。The high-temperature gas discharged from the heating furnace is adsorbed by the adsorption unit 3
Introduced in 1. As the adsorbent used in the adsorption part, for example, an acidic solution and / or an oxidizing solution, a porous material, sulfur and / or a metal sulfide, and a metal that reacts with mercury are preferable.

【００１０】酸性溶液および／または酸化性溶液として
は強酸性の溶液であれば、いずれの溶液でも良いが、例
えば、硝酸、過マンガン酸カリウム水溶液、過マンガン
酸ナトリウム、過酸化水素水、過硫酸アンモニウム、塩
素または有効塩素を含む食塩水等があげられ、またそれ
らを任意に混合したものでも良い。また、吸着装置とし
ては、いずれの形式でも使用可能であるが、例えば充填
塔、流動層スクラバー、スプレー塔等が挙げられる。As the acidic solution and / or the oxidizing solution, any solution may be used as long as it is a strongly acidic solution, and examples thereof include nitric acid, aqueous potassium permanganate solution, sodium permanganate, hydrogen peroxide solution, and ammonium persulfate. Saline solution containing chlorine or available chlorine, etc., and any mixture thereof may be used. As the adsorption device, any type can be used, and examples thereof include a packed tower, a fluidized bed scrubber, and a spray tower.

【００１１】多孔質物質は、比表面積が５００〜１００
０ｍ2／ｇと大きく、その表面に吸着させるため、加熱
炉から排出された高温ガスに含まれる水銀を除去するこ
とができる。多孔質物質は、活性炭、活性アルミナ、ゼ
オライト、フライアッシュ等が挙げられる。なお、多孔
質物質による吸着は、吸着部に導入するガス温度を適当
な温度、例えば５０℃以下に冷却すると吸着効果が向上
し、より好ましい。The porous material has a specific surface area of 500 to 100.
Since it is as large as 0 m 2 / g and is adsorbed on the surface thereof, mercury contained in the high temperature gas discharged from the heating furnace can be removed. Examples of the porous substance include activated carbon, activated alumina, zeolite and fly ash. In the adsorption by the porous substance, it is more preferable that the temperature of the gas introduced into the adsorption part is cooled to an appropriate temperature, for example, 50 ° C. or less, because the adsorption effect is improved.

【００１２】硫黄および／または金属硫化物は、その形
状にとらわれず、例えば粉末状、粒状、ハニカム状等何
れの形状でも良いが、ハニカム状であれば通気ガスの圧
力損失が低く、より好ましい。また、金属硫化物は、水
銀よりもイオン化傾向が大きい金属の硫化物であればい
ずれでも良く、例えば硫化鉄、硫化カリウム等があげら
れる。Sulfur and / or metal sulfide is not limited to its shape, and may have any shape such as powder, granule and honeycomb. However, the honeycomb shape is more preferable because the pressure loss of the ventilation gas is low. The metal sulfide may be any metal sulfide that has a greater ionization tendency than mercury, and examples thereof include iron sulfide and potassium sulfide.

【００１３】水銀と反応する金属は、水銀とアマルガム
を生成する金属、白金、鉄、マンガン、コバルト、ニッ
ケル等を除いた金属、例えば銅、亜鉛、アルミニウム等
が挙げられる。また、金属の形状としては、特に限定さ
れないが、粒状、コイル状、繊維状、ハニカム状が挙げ
られ、通過ガスの圧力損失を低くするためにハニカム状
が好ましい。Examples of the metal that reacts with mercury include metals that form mercury and amalgam, and metals other than platinum, iron, manganese, cobalt, nickel and the like, such as copper, zinc and aluminum. The shape of the metal is not particularly limited, but may be granular, coiled, fibrous, or honeycomb, and honeycomb is preferable in order to reduce the pressure loss of the passing gas.

【００１４】多孔質物質、硫黄および／または金属硫化
物、水銀と反応する金属を吸着媒体とする装置として
は、何れの形式でも使用可能であるがカートリッジ式固
定相吸着装置、吸着塔等があげられる。As a device using a porous material, sulfur and / or metal sulfide, or a metal that reacts with mercury as an adsorption medium, any type can be used, but a cartridge type stationary phase adsorption device, an adsorption tower, etc. can be used. To be

【００１５】これらの吸着材の使用量は、ガス中の水銀
および水銀化合物のモル数の１０倍以上とするのが好ま
しく、より好ましくは１００倍以上とすれば、水銀の除
去率を格段に高めることが出来る。The amount of these adsorbents used is preferably at least 10 times the number of moles of mercury and mercury compounds in the gas, and more preferably at least 100 times the number of moles of mercury is significantly increased. You can

【００１６】吸着部から排出されたガスは吸引ファン３
２を通じて系外に導かれる。この水銀および水銀化合物
を除去したガスは、加熱炉への導入空気として戻し、循
環させ、排ガス中に含まれる水銀を外部に直接排出しな
いようにすることが、より好ましい。The gas exhausted from the adsorbing section is a suction fan 3
It is led out of the system through 2. It is more preferable that the gas from which the mercury and the mercury compound have been removed is returned as the air introduced into the heating furnace and circulated so that the mercury contained in the exhaust gas is not directly discharged to the outside.

【００１７】[0017]

【実施例】以下に実施例を挙げ、本発明をより詳細に説
明する。 〔実施例１〕火力発電所由来の石炭灰２ｋｇを両端が開
口した管（８０ｍｍφ×１０００ｍｍ）の中央部に充填
し、２００〜５００℃で３０分加熱した。このとき試験
管の片側開口部から空気を４００ｍｌ／分導入し、他端
から排出したガスを、水銀除去装置に導いて室温まで冷
却した。水銀除去装置は吸収液を用いたものについて
は、容量２５０ｍｌのインピンジャーに硝酸を６０ｍｌ
入れたものを２本連結したものとした。また、固体の吸
着材を用いたものについては、粉末状の硫黄、粉末状の
活性炭、粒状の銅をガラス製の管に１０ｇ入れ、吸収材
の両端をガラスウールで固定したものとした。なお、硝
酸、硫黄、硫化マグネシウム、活性炭、銅はいずれも関
東化学製のものを用いた。水銀除去装置通過後のガス中
水銀濃度、および加熱処理後の石炭灰中の水銀含有量お
よび吸着材通過後のガス中の水銀量は、日本インスツル
メンツ社製の水銀分析装を用いて測定を行った。なお、
加熱ガス中の水銀量は未処理原料中の水銀量、供給空気
量、処理後の原料中の水銀量から、計算によって算出し
た。原料に含まれる水銀含有量と処理効果を表１に示し
た。EXAMPLES The present invention will be described in more detail with reference to the following examples. [Example 1] 2 kg of coal ash derived from a thermal power plant was filled in the center of a tube (80 mmφ x 1000 mm) having open ends, and heated at 200 to 500 ° C for 30 minutes. At this time, air was introduced at 400 ml / min from one side opening of the test tube, and the gas discharged from the other end was introduced into a mercury removing device and cooled to room temperature. If the mercury removal device uses an absorbing solution, 60 ml of nitric acid should be added to an impinger with a capacity of 250 ml.
Two of them were connected. Further, in the case of using a solid adsorbent, 10 g of powdered sulfur, powdered activated carbon and granular copper were put in a glass tube, and both ends of the absorbent were fixed with glass wool. Note that nitric acid, sulfur, magnesium sulfide, activated carbon, and copper were all manufactured by Kanto Kagaku. The mercury concentration in the gas after passing through the mercury removing device, and the mercury content in the coal ash after heat treatment and the amount of mercury in the gas after passing through the adsorbent were measured using a mercury analyzer made by Japan Instruments. It was In addition,
The amount of mercury in the heated gas was calculated from the amount of mercury in the untreated raw material, the amount of supply air, and the amount of mercury in the treated raw material. Table 1 shows the content of mercury contained in the raw materials and the treatment effect.

【００１８】[0018]

【表１】 [Table 1]

【００１９】〔実施例２〕図１に示す処理システムを設
置したセメント製造テストプラントを用いたテストにお
いて、水銀が高濃度の廃棄物を原料の一部として通常の
原料とともに加熱炉に供給し、所定温度に加熱し、その
加熱ガスを、活性炭を充填した吸着部に導入して冷却ガ
ス中の水銀を分離した。冷却したガスは吸引ファンを通
じて再び加熱炉に戻した。この処理結果を表２に示し
た。Example 2 In a test using a cement manufacturing test plant equipped with the treatment system shown in FIG. 1, waste having a high concentration of mercury was supplied as a part of the raw material to a heating furnace together with an ordinary raw material, After heating to a predetermined temperature, the heating gas was introduced into an adsorption section filled with activated carbon to separate mercury in the cooling gas. The cooled gas was returned to the heating furnace through a suction fan. The results of this treatment are shown in Table 2.

【００２０】[0020]

【表２】 [Table 2]

【００２１】表１、表２に示すように本発明によれば、
水銀を含む廃棄物原料から水銀を除去し、セメント工程
内に持ち込まれる水銀および水銀化合物を低減すること
ができる。また、加熱処理後の水銀を含む排ガスの水銀
濃度についても水銀吸着部を導入することによって低減
できることを確認した。According to the present invention, as shown in Tables 1 and 2,
It is possible to remove mercury from waste raw materials containing mercury and reduce mercury and mercury compounds introduced into the cement process. It was also confirmed that the mercury concentration of the exhaust gas containing mercury after the heat treatment can be reduced by introducing the mercury adsorption section.

【００２２】[0022]

【発明の効果】本発明の処理方法によれば、この原料を
処理することによってセメント製造工程に持ち込まれる
水銀等を除去し、水銀を効率よく回収することができ
る。また、本発明の方法は水銀および水銀化合物を含む
原料を処理するので、既存の原料投入工程に付設するだ
けで容易に実施することができる。According to the treatment method of the present invention, by treating this raw material, mercury and the like brought into the cement manufacturing process can be removed, and mercury can be efficiently recovered. Further, since the method of the present invention treats a raw material containing mercury and a mercury compound, it can be easily carried out only by adding it to the existing raw material charging step.

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

【図１】本発明の処理工程を示すフロー図FIG. 1 is a flow chart showing the processing steps of the present invention.

【符号の説明】[Explanation of symbols]

１０−原料ライン、２０−粉砕機、３０−加熱炉、３１
−吸着部、３２−冷却ファン10-raw material line, 20-crusher, 30-heating furnace, 31
-Adsorption part, 32-Cooling fan

───────────────────────────────────────────────────── 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） Ｃ０４Ｂ 7/43 Ｂ０１Ｄ 53/34 １３６Ａ Ｆターム(参考） 4D002 AA29 AC05 BA02 BA03 BA04 CA01 CA06 CA07 CA09 DA02 DA03 DA07 DA15 DA17 DA21 DA22 DA23 DA24 DA26 DA38 DA41 DA45 DA46 DA52 DA53 DA66 4D004 AA36 AB03 BA02 CA22 CA47 4D059 AA06 AA12 BF02 BK11 CA14 CC04 DA15 DA19 DA21 DA25 DA31 DA34 DA41 DA44 DA46 DA55 DA61 DA64 DA70 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) C04B 7/43 B01D 53/34 136A F term (reference) 4D002 AA29 AC05 BA02 BA03 BA04 CA01 CA06 CA07 CA09 DA02 DA03 DA07 DA15 DA17 DA21 DA22 DA23 DA24 DA26 DA38 DA41 DA45 DA46 DA52 DA53 DA66 4D004 AA36 AB03 BA02 CA22 CA47 4D059 AA06 AA12 BF02 BK11 CA14 CC04 DA15 DA19 DA21 DA25 DA31 DA34 DA41 DA44 DA46 DA55 DA61 DA64 DA70

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】 セメント製造に使用する原料を加熱炉に
導き、原料に含まれる水銀および水銀化合物をガス化
し、この高温ガスを吸着部に導いて水銀および水銀化合
物を吸着し、ガス中から分離することによって、原料中
の水銀および水銀化合物の濃度を低減し、その原料をセ
メント製造工程に導いてセメントクリンカを焼成するこ
とを特徴とするセメント製造方法。1. A raw material used for cement production is introduced into a heating furnace, mercury and mercury compounds contained in the raw material are gasified, and this high-temperature gas is introduced into an adsorption part to adsorb mercury and mercury compounds and separated from the gas. By doing so, the concentration of mercury and mercury compounds in the raw material is reduced, and the raw material is introduced into the cement production process to burn the cement clinker, and the method for producing cement. 【請求項２】 高温ガス中の水銀および水銀化合物を吸
着部で吸着した後、このガスを加熱炉内に再導入するこ
とによって、水銀の大気排出を防止する請求項１のセメ
ント製造方法。2. The method for producing cement according to claim 1, wherein mercury and mercury compounds in the high-temperature gas are adsorbed by the adsorbing section, and then this gas is reintroduced into the heating furnace to prevent mercury from being discharged into the atmosphere. 【請求項３】 セメント製造工程において排出された熱
ガスによって加熱炉を加熱する請求項１または２のセメ
ント製造方法。3. The cement manufacturing method according to claim 1, wherein the heating furnace is heated by the hot gas discharged in the cement manufacturing step. 【請求項４】 前記吸着部に導入する吸着材を酸性溶液
および／または酸化性溶液とする請求項１〜３のいずれ
かに記載のセメント製造方法。4. The cement manufacturing method according to claim 1, wherein the adsorbent introduced into the adsorbing section is an acidic solution and / or an oxidizing solution. 【請求項５】 前記吸着部に導入する吸着材を多孔質物
質とする請求項１〜３のいずれかに記載のセメント製造
方法。5. The cement manufacturing method according to claim 1, wherein the adsorbent introduced into the adsorbing section is a porous substance. 【請求項６】 前記吸着部に導入する吸着材を硫黄およ
び／または金属硫化物とする請求項１〜３のいずれかに
記載のセメント製造方法。6. The method for producing cement according to claim 1, wherein the adsorbent introduced into the adsorption section is sulfur and / or metal sulfide. 【請求項７】 前記吸着部に導入する吸着材を水銀と反
応する金属とする請求項１〜３のいずれかに記載のセメ
ント製造方法。7. The cement manufacturing method according to claim 1, wherein the adsorbent introduced into the adsorbing section is a metal that reacts with mercury.
JP2001388420A 2001-12-20 2001-12-20 Method of producing cement for reducing mercury in raw material Pending JP2003192407A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Publication Number Publication Date
JP2003192407A true JP2003192407A (en) 2003-07-09

Family

ID=27596941

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Country Link
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