JP4686227B2 - Treatment method of sulfuric acid pitch - Google Patents

Treatment method of sulfuric acid pitch Download PDF

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JP4686227B2
JP4686227B2 JP2005082944A JP2005082944A JP4686227B2 JP 4686227 B2 JP4686227 B2 JP 4686227B2 JP 2005082944 A JP2005082944 A JP 2005082944A JP 2005082944 A JP2005082944 A JP 2005082944A JP 4686227 B2 JP4686227 B2 JP 4686227B2
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sulfuric acid
acid pitch
cement
fine powder
pitch
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JP2006263530A (en
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育子 渡辺
達志 秋山
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Sumitomo Osaka Cement Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は、石油精製過程にて生じた硫酸ピッチをコンクリート廃材から再生骨材回収時に生じる微粉末で中和処理する硫酸ピッチの処理方法に関するものである。   The present invention relates to a method for treating sulfuric acid pitch, in which sulfuric acid pitch generated in the petroleum refining process is neutralized with fine powder generated during recovery of recycled aggregate from concrete waste.

従来、石油精製過程においては、原油に含まれている金属類や不純物を取り除くために硫酸を用いて洗浄処理を施しているが、この洗浄処理過程では、硫酸が残留した石油ピッチ(以下、硫酸ピッチと呼ぶ。)が残渣として多量に発生する。
この硫酸ピッチは、廃酸と廃油の混合物からなるもので、硫黄分、アスファルト質等を含むタール状の物質である。この硫酸ピッチは、通常、中和して焼却処理される。
硫酸ピッチは、例えば、硫酸または硫酸イオンを30〜40%、石油タールを30〜40%、油分を10%程度、それぞれ含むもので、油分が多いものは粘性の高い液状であるが、油分が揮発してくるにつれて液状から固体状に変化することとなる。この硫酸ピッチは、硫酸または硫酸イオンの濃度が非常に高いために、例えば、pHが1程度の強い酸性を示す。
Conventionally, in the oil refining process, washing treatment is performed using sulfuric acid to remove metals and impurities contained in the crude oil. In this washing treatment process, petroleum pitch (hereinafter referred to as sulfuric acid) in which sulfuric acid remains is used. A large amount of residue is generated as a residue.
This sulfuric acid pitch consists of a mixture of waste acid and waste oil, and is a tar-like substance containing sulfur, asphalt and the like. This sulfuric acid pitch is usually neutralized and incinerated.
Sulfuric acid pitch contains, for example, 30 to 40% sulfuric acid or sulfate ions, 30 to 40% petroleum tar, and about 10% oil, and the one with a lot of oil is a highly viscous liquid. As it volatilizes, it changes from liquid to solid. Since this sulfuric acid pitch has a very high concentration of sulfuric acid or sulfate ions, it exhibits a strong acidity with a pH of about 1, for example.

この硫酸ピッチは、中和処理の際に有害ガスが発生するおそれがあり、また、焼却処理の際に発生する酸性ガスにより焼却炉が腐食するおそれがあり、この酸性ガスを環境中に放出しないために該酸性ガスを分離捕集する必要がある等、様々な問題点があり、廃棄処理を容易に行うことができないものであった。
そこで、以下のように、硫酸ピッチの様々な処理方法(特許文献1、2参照)が提案され、実用に供されている。
This sulfuric acid pitch may generate harmful gas during the neutralization process, and the incinerator may corrode due to the acidic gas generated during the incineration process, and does not release this acidic gas into the environment. Therefore, there are various problems such as the need to separate and collect the acidic gas, and the disposal process cannot be easily performed.
Therefore, various treatment methods for sulfuric acid pitch (see Patent Documents 1 and 2) have been proposed and put into practical use as follows.

特許文献1の処理方法では、硫酸ピッチにセメントを加えて攪拌混合して、油分及び反応生成物からなる混合物と気化ガスとに分離する。気化ガスは燃焼処理し、混合物は油分を分離して燃料油として利用し、残された粉末状の反応生成物を建築材料等に利用する。
この処理には、硫酸ピッチをセメントで中和処理をする攪拌混合装置、中和反応で生じたオイルヒューム・オイルミストを回収する油分回収装置、撹拌混合装置から発生したオイルフューム・オイルミストを吸引するファン、油分回収装置2で未回収となった油分を燃焼させる燃焼炉、及び燃焼排ガスを排出する排気筒を主構成要素とする処理装置が用いられている。
In the treatment method of Patent Document 1, cement is added to sulfuric acid pitch, and the mixture is stirred and mixed to be separated into a mixture composed of an oil and a reaction product and a vaporized gas. The vaporized gas is combusted, the mixture separates the oil and is used as fuel oil, and the remaining powdery reaction product is used for building materials and the like.
For this treatment, a stirring and mixing device that neutralizes the sulfuric acid pitch with cement, an oil recovery device that recovers oil fume and oil mist generated by the neutralization reaction, and an oil fume and oil mist generated from the stirring and mixing device are sucked in. A processing apparatus having a main component as a fan, a combustion furnace that burns oil that has not been recovered by the oil recovery device 2, and an exhaust pipe that discharges combustion exhaust gas is used.

特許文献2の方法は、硫酸ピッチを中和・無害化することによって、セメント焼成の際の原料や助燃材として有効利用するもので、石油精製により生じて地中に埋設した流動性を有する砂混じりの硫酸ピッチを掘り出し、この砂混じり硫酸ピッチに一定量の砂と無機セメント系固化剤と消石灰等の処理材を加えて攪拌混合して粘性を取り、無害化して均一な混合物(安定処理土)とし、塊状物と油分の多い処理物に分離する。この分離した塊状物を破砕して砂状とし、セメント焼成設備に投入することでセメント原料の混合材として利用するとともに、油分の多い処理物をセメント焼成の際の助燃材として利用する方法である。   The method of Patent Document 2 is to effectively use sulfuric acid pitch as a raw material and auxiliary combustion material for cement firing by neutralizing and detoxifying sulfuric acid pitch. Excavate mixed sulfuric acid pitch, add a certain amount of sand, inorganic cement-based solidifying agent and treatment material such as slaked lime to this mixed sulfuric acid pitch, stir and mix to remove viscosity, detoxify and make uniform mixture (stable treated soil) ) And separated into lump and oily processed product. The separated lump is crushed into sand and used as a cement raw material mixture by putting it in a cement firing facility, and a method of using a processed oil-rich product as a combustion aid during cement firing. .

しかしながら、これら従来の硫酸ピッチの処理方法では、中和効果が認められ、処理後のハンドリングの簡便性も改善されたが、臭気の脱臭性、有害重金属の固定化、低価格などの点で満足すべきものではなかった。   However, these conventional sulfuric acid pitch treatment methods have shown a neutralizing effect and improved ease of handling after treatment, but are satisfactory in terms of deodorization of odor, immobilization of toxic heavy metals, low cost, etc. It shouldn't have been.

特開2000−42594号公報JP 2000-42594 A 特開2002−180067号公報Japanese Patent Laid-Open No. 2002-180067

本発明は、上記の問題点に鑑み、石油精製過程にて生じた硫酸ピッチを、従来廃棄されている材料を使用することで中和にかかる材料コストを低減し、中和効果が十分で、処理後のハンドリング性がよく、臭気の脱臭、有害重金属の固定化が可能な硫酸ピッチの処理方法を提供することを目的とする。   In view of the above-mentioned problems, the present invention reduces the material cost for neutralization of sulfuric acid pitch generated in the petroleum refining process by using materials that have been conventionally discarded, and the neutralization effect is sufficient. An object of the present invention is to provide a method for treating a sulfuric acid pitch, which has good handleability after the treatment, can deodorize odors, and can fix harmful heavy metals.

本発明者らは、上記課題を解決するために鋭意研究を重ねた結果、硫酸ピッチをコンクリート廃材から再生骨材回収時に生じる微粉末で処理することで、中和剤の材料コストを低減し、中和効果が十分で、処理後のハンドリング性がよく、臭気の脱臭、有害重金属の固定化が可能であることを見出し、本発明を完成するに至った。   As a result of intensive research to solve the above-mentioned problems, the present inventors have reduced the material cost of the neutralizing agent by treating sulfuric acid pitch with fine powder generated during recycled aggregate recovery from concrete waste, The inventors have found that the neutralizing effect is sufficient, the handling property after treatment is good, the odor can be deodorized and the toxic heavy metals can be fixed, and the present invention has been completed.

すなわち、本発明の硫酸ピッチの処理方法は、石油精製過程にて生じた硫酸ピッチを解体コンクリートなどのコンクリート廃材から再生骨材回収時に生じる微粉末で中和処理することを特徴とする。
また、得られた処理物は、路盤材料等の土木建築材料として、あるいはセメント焼成工程の原料又は助燃材として利用することができ、後者の場合、該処理物はセメント製造設備の800℃以上の高温部に投入することにより行われるのが好ましい。
That is, the sulfuric acid pitch processing method of the present invention is characterized in that the sulfuric acid pitch generated in the petroleum refining process is neutralized with fine powder generated during recovery of recycled aggregate from concrete waste such as demolished concrete.
In addition, the obtained treated product can be used as civil engineering and building materials such as roadbed materials, or as a raw material or auxiliary material for a cement firing process. In the latter case, the treated product is 800 ° C. or more of cement production equipment. It is preferable to carry out by putting it in a high temperature part.

前記中和処理は、中和滴定法により前記硫酸ピッチ中の硫酸の含有量を求め、次いで、この硫酸を中和するのに十分な量のコンクリート廃材から再生骨材回収時に生じる微粉末を前記硫酸ピッチに加えて該硫酸ピッチ中の硫酸を中和し、次いで、この処理物を粒状化または塊状化することが好ましい。
また、硫酸ピッチと微粉末を十分に混合して中和反応を円滑に進行させるために、前記中和処理の前に、前記硫酸ピッチの粘性を低下させておくことが好ましい。粘性を低下させる方法としては、中和処理の前に、硫酸ピッチを加熱することが好ましいが、該硫酸ピッチに水または溶剤を添加してもよい。
In the neutralization treatment, the content of sulfuric acid in the sulfuric acid pitch is determined by a neutralization titration method, and then the fine powder generated at the time of recovery aggregate recovery from a sufficient amount of concrete waste to neutralize the sulfuric acid It is preferable to neutralize the sulfuric acid in the sulfuric acid pitch in addition to the sulfuric acid pitch, and then granulate or agglomerate the treated product.
In addition, in order to sufficiently mix the sulfuric acid pitch and the fine powder so that the neutralization reaction proceeds smoothly, it is preferable to reduce the viscosity of the sulfuric acid pitch before the neutralization treatment. As a method for reducing the viscosity, it is preferable to heat the sulfuric acid pitch before the neutralization treatment, but water or a solvent may be added to the sulfuric acid pitch.

本発明の硫酸ピッチの処理方法によれば、硫酸ピッチは、「コンクリート廃材から再生骨材回収時に生じる微粉末」(「コンクリート廃材微粉末」または単に「微粉末」と呼ぶことがある。)と混合され、その結果中和処理されるが、該コンクリート廃材微粉末の下記特性により、処理後のハンドリング性がよく、臭気の脱臭、有害重金属の固定化が可能であり、運搬が容易で安全な状態に改質される。   According to the method for treating sulfuric acid pitch of the present invention, the sulfuric acid pitch is referred to as “fine powder generated during recovery of recycled aggregate from concrete waste” (sometimes referred to as “concrete waste fine powder” or simply “fine powder”). As a result, it is neutralized, but due to the following properties of the concrete waste fine powder, it is easy to handle after treatment, it is possible to deodorize and immobilize toxic heavy metals, and it is easy and safe to transport. It is reformed to a state.

コンクリート廃材から再生骨材回収時に生じる微粉末中のセメント水和物粒子は、平均粒径が0.10mm以下、比表面積が4000〜10000cm2/g程度と未水和のセメント粒子より細かい。また、モルタルペーストが粉砕されたものであるため、微粉末中には様々な径のセメント水和物粒子が存在する。硫酸ピッチ中のH2SO4は、微粉末中のセメント水和物と反応することで中和され、セメント水和物粒子中に中和反応によってCaが抜けた後にできる空隙の細孔径は、セメント水和物粒子の粒径同様多彩な細孔径を持つ。 The cement hydrate particles in the fine powder produced during the recovery of recycled aggregates from concrete waste are finer than unhydrated cement particles, with an average particle size of 0.10 mm or less and a specific surface area of about 4000 to 10000 cm 2 / g. In addition, since the mortar paste is pulverized, cement hydrate particles having various diameters exist in the fine powder. H 2 SO 4 in the sulfuric acid pitch is neutralized by reacting with the cement hydrate in the fine powder, and the pore diameter of the void formed after Ca is removed by the neutralization reaction in the cement hydrate particles is It has various pore sizes as well as the particle size of cement hydrate particles.

多彩な細孔径を持つセメント水和物粒子中に、硫酸ピッチの油分が封じ込められるため、油分が分離され、粘性が低下することで、ハンドリング性が向上する。
また、SO2ガスなどの有害ガスは、中和時に形成された多彩な細孔径空隙から、最適な細孔径の空隙に取り込まれることによって、臭気が低減し、外部へ排出されるおそれがなくなる。
また、Pbなどの有害重金属は、多彩な細孔径の空隙から、最適な細孔径の空隙に取り込まれることで、処理物中に固定化される。
硫酸ピッチの粘性が低下され、有害ガスおよび有害重金属が固定化されたコンクリート廃材微粉末の処理物は、セメント焼成設備にて燃焼処理され、他のセメント原料とともにセメントクリンカーの一成分となる。
すなわち、本発明によれば、産業廃棄物である硫酸ピッチを、廃棄処分されていたコンクリート廃材から再生骨材回収時に生じる微粉末で中和処理することで得た物を、セメント原料及び焼成時の燃料として、あるいは路盤材料等の土木建築材料として利用することができ、これら廃棄物の再資源化を図ることができる。
Since the oil component of sulfuric acid pitch is contained in cement hydrate particles having various pore sizes, the oil component is separated and the viscosity is lowered, thereby improving the handling property.
In addition, harmful gases such as SO 2 gas are taken into voids having an optimum pore diameter from various pore diameter voids formed at the time of neutralization, thereby reducing odor and eliminating the possibility of being discharged to the outside.
In addition, harmful heavy metals such as Pb are immobilized in the processed material by being taken into the voids having the optimum pore diameter from the voids having various pore diameters.
The treated material of the concrete waste material fine powder in which the viscosity of the sulfuric acid pitch is reduced and the toxic gas and toxic heavy metal are fixed is combusted in a cement firing facility and becomes one component of the cement clinker together with other cement raw materials.
That is, according to the present invention, a product obtained by neutralizing sulfuric acid pitch, which is an industrial waste, with a fine powder generated at the time of recovered aggregate recovery from a discarded concrete waste, It can be used as a fuel for construction or as civil engineering and building materials such as roadbed materials, and the waste can be recycled.

以下、本発明の硫酸ピッチの処理方法の一実施の形態について、図1も参照しながら説明するが、特に指定のない限り、もとより本発明を限定するものではない。   Hereinafter, an embodiment of the sulfuric acid pitch treatment method of the present invention will be described with reference to FIG. 1 as well, but the present invention is not limited to the above unless otherwise specified.

中和処理槽22に石油精製過程にて生じた硫酸ピッチを所定量貯留し、この硫酸ピッチに廃棄処分されていたコンクリート廃材から再生骨材回収時に生じる微粉末を添加し、中和処理する。   A predetermined amount of sulfuric acid pitch generated in the oil refining process is stored in the neutralization treatment tank 22, and fine powder generated at the time of recovering recycled aggregates from the discarded concrete is added to the sulfuric acid pitch for neutralization treatment.

コンクリート廃材からの再生骨材の回収は、一般的に次のように行われる。
コンクリート廃材を加熱し、モルタル部分と骨材部分の付着を弱くしてから、骨材部分を破砕しない程度に粉砕、摩砕を行い、得られた破砕物を篩で各種骨材(細骨材、粗骨材)、その他と「微粉末」に分別し、各種骨材を再生骨材として回収する。
本発明においては、このコンクリート廃材からの再生骨材の回収時に生じる微粉末を利用するものであり、該微粉末はセメント水和物を主要成分(反応成分)とし、回収されなかった小粒径の細骨材を含む。細骨材の含有割合は、篩分けの程度(細骨材の回収度合い)により、セメント水和物1質量部に対し細骨材0.1〜5質量部、通常2〜4質量部の範囲である。なお、セメント水和物粒子の平均粒径は前記したように0.10mm以下であり、細骨材の最大粒径は5mm以下、通常2.5mm以下である。
The recovery of recycled aggregate from concrete waste is generally performed as follows.
After heating the concrete waste material to weaken the adhesion between the mortar part and the aggregate part, the aggregate part is pulverized and ground to such an extent that the aggregate part is not crushed. , Coarse aggregate), etc., and “fine powder”, and various aggregates are recovered as recycled aggregates.
In the present invention, a fine powder generated at the time of recovery of recycled aggregate from the concrete waste is used, and the fine powder has cement hydrate as a main component (reaction component) and a small particle size that has not been recovered. Including fine aggregates. The content ratio of fine aggregate is 0.1-5 parts by mass of fine aggregate, usually 2-4 parts by mass with respect to 1 part by mass of cement hydrate, depending on the degree of sieving (recovery degree of fine aggregate). It is. The average particle size of the cement hydrate particles is 0.10 mm or less as described above, and the maximum particle size of the fine aggregate is 5 mm or less, usually 2.5 mm or less.

本発明の硫酸ピッチの中和処理は、より具体的には次のように行う。
まず、中和滴定法により硫酸ピッチ中の硫酸の含有量を求め、次いで、この硫酸ピッチを攪拌しつつ、この硫酸ピッチ中の硫酸を中和するに十分な量のコンクリート廃材から再生骨材回収時に生じる微粉末を加え、硫酸ピッチ中の硫酸を中和し、中和処理物とする。
これにより、中和処理物のpH(水素イオン濃度)は、中和前の硫酸ピッチの状態ではpHが2以下であったものが、中和後には4〜12程度(望ましくは6〜10.5)にまで上昇し、弱酸性、中性もしくはアルカリ性を呈することとなる。
More specifically, the neutralization treatment of the sulfuric acid pitch of the present invention is performed as follows.
First, the content of sulfuric acid in the sulfuric acid pitch is determined by a neutralization titration method, and then recycled aggregate is recovered from a sufficient amount of concrete waste to neutralize the sulfuric acid in the sulfuric acid pitch while stirring the sulfuric acid pitch. A fine powder that is sometimes generated is added to neutralize the sulfuric acid in the sulfuric acid pitch to obtain a neutralized product.
As a result, the pH (hydrogen ion concentration) of the neutralized product is about 4 to 12 (preferably 6 to 10. 5), and exhibits weak acidity, neutrality or alkalinity.

硫酸ピッチの粘性が高く撹拌し難い場合には、予め、中和処理槽22のヒータ(図示略)により硫酸ピッチを加熱して該硫酸ピッチの粘性を低下させておくとよい。
また、硫酸ピッチに水または有機溶剤を添加し、この硫酸ピッチの粘性を低下させておいてもよい。
さらには、この中和処理において、油分吸着・ハンドリング性状改善等のために、コンクリート廃材微粉末を添加する際に、木粉等をともに添加してもよい。
When the viscosity of the sulfuric acid pitch is high and difficult to stir, it is preferable to previously reduce the viscosity of the sulfuric acid pitch by heating the sulfuric acid pitch with a heater (not shown) of the neutralization treatment tank 22.
Further, water or an organic solvent may be added to the sulfuric acid pitch to reduce the viscosity of the sulfuric acid pitch.
Further, in this neutralization treatment, wood powder or the like may be added together with the addition of the concrete waste fine powder in order to improve oil adsorption and handling properties.

また、コンクリート廃材から再生骨材回収時に生じる微粉末は、硫酸ピッチを中和するために必要な量以上に添加してもよい。
コンクリート廃材から再生骨材回収時に生じる微粉末の添加量が少ない場合は、得られた中和処理物が酸性になり、これと接する金属は腐食し易くなるため、セメント原料や燃料等として使用する際、輸送装置や保管庫、セメント焼成装置にトラブルが生じ易くなる。しかし、コンクリート廃材から再生骨材回収時に生じる微粉末の添加量が多い場合、得られた中和処理物はアルカリ性となるが、アルカリ性では、これと接する金属は腐食し難くなるのでこのような問題は生じない。
Further, the fine powder generated at the time of recovering the recycled aggregate from the concrete waste may be added in an amount more than necessary to neutralize the sulfuric acid pitch.
When the amount of fine powder added during recovery of recycled aggregate from concrete waste is small, the resulting neutralized product becomes acidic, and the metal in contact with it tends to corrode, so it is used as a cement raw material, fuel, etc. At this time, troubles are likely to occur in the transport device, storage, and cement firing device. However, when there is a large amount of fine powder added during recovery of recycled aggregate from concrete waste, the resulting neutralized product becomes alkaline, but in alkaline, the metal in contact with this becomes difficult to corrode, so this problem Does not occur.

次いで、得られた中和処理物を粒状化装置23に投入し、粒状化する。
ここでは、投入された中和処理物は、この粒状化装置23内に設けられたヒータ(図示略)により所定の温度、例えば、30〜150℃に加熱され、内部に含まれる水分や揮発性有機物等が蒸発(あるいは揮発)し、この中和処理物から散逸する。残った半固体状の中和処理物は粒状化されて、例えば、1〜20mm径の大きさの粒子となる。
Next, the obtained neutralized product is put into the granulating device 23 and granulated.
Here, the charged neutralized product is heated to a predetermined temperature, for example, 30 to 150 ° C. by a heater (not shown) provided in the granulating device 23, so that moisture and volatile contained therein are contained. Organic matter etc. evaporate (or volatilize) and dissipate from this neutralized product. The remaining semi-solid neutralized product is granulated into particles having a diameter of 1 to 20 mm, for example.

このようにして得られる本発明の中和処理物は、セメント原料及び焼成時の燃料として利用する場合は、例えば次のように操作することが好ましい。
上記の粒状化された中和処理物を、投入ライン24によりセメント焼成設備の800℃以上の高温部である窯尻部4aに投入する。
中和処理物を投入する位置は、セメント焼成設備の800℃以上の高温部であればよく、窯尻部4aの他、原料予熱装置の最下段の仮焼炉6、ロータリーキルン4の出口である窯前部4b等が好適である。
The neutralized product of the present invention thus obtained is preferably operated as follows, for example, when used as a cement raw material and a fuel for firing.
The granulated neutralized product is charged into the kiln butt portion 4a, which is a high-temperature portion of 800 ° C. or more of the cement firing facility, through the charging line 24.
The position where the neutralized product is charged may be a high-temperature portion of 800 ° C. or higher of the cement firing facility, and is the bottom calcining furnace 6 of the raw material preheating device and the outlet of the rotary kiln 4 in addition to the kiln bottom 4a. The kiln front part 4b etc. are suitable.

ここで、中和処理物の投入位置を、セメント焼成設備の800℃以上の高温部とした理由は、例えば、中和処理物を他の粉末原料と同様の800℃より低温の位置に投入して燃焼処理すると、この中和処理物に含まれる硫酸ピッチがサスペンションプレヒータ7の最上段のサイクロン7aでほとんど燃焼してしまうため、セメント焼成設備の排ガス温度を上昇させるのみで、この硫酸ピッチの保有熱量を有効利用することができないからである。
さらに、硫酸ピッチの不完全燃焼によりダイオキシン類が発生するおそれがあり、また、この不完全燃焼に伴い発生する炭化物が排ガス中に含まれる結果、電気集塵機等の集塵装置の集塵効率を低下させ、煤塵等が外部に排出されるおそれもある。
Here, the reason for setting the charging position of the neutralized product to be a high temperature portion of 800 ° C. or higher of the cement firing equipment is, for example, that the neutralized product is charged at a temperature lower than 800 ° C. as in the case of other powder raw materials. When the combustion treatment is performed, the sulfuric acid pitch contained in the neutralized product is almost burned in the uppermost cyclone 7a of the suspension preheater 7. Therefore, the sulfuric acid pitch is retained only by raising the exhaust gas temperature of the cement firing equipment. This is because the amount of heat cannot be used effectively.
In addition, dioxins may be generated due to incomplete combustion of sulfuric acid pitch, and as a result of inclusion of carbides generated in this incomplete combustion in exhaust gas, the dust collection efficiency of dust collectors such as electric dust collectors is reduced. In addition, dust and the like may be discharged to the outside.

一方、中和処理物の投入位置を800℃以上の高温部とすれば、中和処理物の油分は、完全に燃焼分解し、燃焼残渣と硫黄分は予熱装置で加熱されたセメント原料中に取り込まれ、ロータリーキルン4内で焼成され、セメントクリンカーとなるので、硫酸ピッチの燃焼に伴って排出される煤塵や有害物質はない。   On the other hand, if the charging position of the neutralized product is a high temperature part of 800 ° C. or higher, the oil content of the neutralized product is completely burned and decomposed, and the combustion residue and sulfur content are contained in the cement raw material heated by the preheating device. Since it is taken in and fired in the rotary kiln 4 to become a cement clinker, there is no soot and harmful substances discharged with combustion of sulfuric acid pitch.

なお、硫酸ピッチに埋立て処分等により礫や砂が含まれる場合は、中和処理物を、篩により分級して砂分をロータリーキルン4に投入するとともに、取り除いた礫を粉砕してからロータリーキルン4に投入することとするのが好ましい。
この場合、砂分や粉砕した礫は、ロータリーキルン4にて完全に焼成されてクリンカー成分となる。
When gravel and sand are contained in the sulfuric acid pitch due to landfill disposal, etc., the neutralized product is classified by a sieve and the sand is put into the rotary kiln 4 and the removed gravel is crushed before the rotary kiln 4. It is preferable to put it in
In this case, the sand and crushed gravel are completely baked in the rotary kiln 4 to become a clinker component.

以上説明したように、本実施形態の硫酸ピッチの処理方法によれば、硫酸ピッチをコンクリート廃材から再生骨材回収時に生じる微粉末にて中和処理するので、中和処理を行った硫酸ピッチを容易に粒状化(または塊状化)することができる。また、粒状化(または塊状化)した中和処理物をセメント焼成設備の高温部に投入し、この中和処理物を燃焼処理するので、セメント焼成設備の操業に影響を及ぼすことなく、安定して硫酸ピッチを処理することができる。
しかも、硫酸ピッチの燃焼に伴って発生する酸化硫黄(SOx)等の排出を抑えることができるので、酸化硫黄(SOx)等を処理するための新たな処理装置を設ける必要が無く、容易に燃焼処理を行うことができる。
As described above, according to the sulfuric acid pitch treatment method of the present embodiment, since the sulfuric acid pitch is neutralized with fine powder generated at the time of recycled aggregate recovery from the concrete waste, the sulfuric acid pitch that has been subjected to the neutralization treatment is used. It can be easily granulated (or agglomerated). In addition, the granulated (or agglomerated) neutralized product is charged into the high-temperature part of the cement firing facility, and this neutralized product is combusted, so it is stable without affecting the operation of the cement firing facility. The sulfuric acid pitch can be treated.
In addition, since it is possible to suppress the emission of sulfur oxide (SO x ) and the like generated by the combustion of sulfuric acid pitch, there is no need to provide a new processing device for treating sulfur oxide (SO x ), etc. The combustion process can be performed.

また、硫酸ピッチに含まれる硫酸または硫酸イオンを中和処理により無害化することができ、外部へ排出されるおそれもない。また、この硫酸ピッチは、中和処理過程でコンクリート廃材から再生骨材回収時に生じる微粉末と反応することで中和処理物中に取り込まれ、その後、ロータリーキルン4にて燃焼処理されるので、硫酸ピッチの有する熱量及び硫黄成分を有効利用することができる。   In addition, sulfuric acid or sulfate ions contained in the sulfuric acid pitch can be rendered harmless by neutralization, and there is no possibility of being discharged to the outside. In addition, this sulfuric acid pitch is taken into the neutralized product by reacting with the fine powder generated during the recovery of recycled aggregate from the concrete waste during the neutralization process, and then burned in the rotary kiln 4, The amount of heat and sulfur component of the pitch can be used effectively.

本実施形態の硫酸ピッチの処理装置21によれば、硫酸ピッチをコンクリート廃材から再生骨材回収時に生じる微粉末にて中和処理する中和処理槽22と、中和処理物を粒状化する粒状化装置23と、ホッパ24と、この粒状化された中和処理物をロータリーキルン4の窯尻部4aに投入する投入ライン25と、これらの装置における硫酸ピッチ、コンクリート廃材から再生骨材回収時に生じる微粉末等の供給量、温度等を制御する制御装置(図示略)とにより構成したので、硫酸ピッチの処理を安全かつ確実に行うことができ、ダイオキシン等の有害物質が生じるおそれもない。また、産業廃棄物である硫酸ピッチの中和処理物をセメント原料及び焼成時の燃料として利用することができ、廃棄物の再資源化を図ることができる。   According to the sulfuric acid pitch treatment apparatus 21 of the present embodiment, the neutralization treatment tank 22 for neutralizing the sulfuric acid pitch with fine powder generated during the recovery of recycled aggregate from the concrete waste, and the granularity for granulating the neutralized product Generated at the time of recovering recycled aggregate from sulfuric acid pitch and concrete waste in these devices, and a charging line 23 for feeding the granulated neutralized product into the kiln bottom 4a of the rotary kiln 4. Since it is configured with a control device (not shown) for controlling the supply amount of fine powder and the like, temperature and the like, the sulfuric acid pitch can be processed safely and reliably, and there is no possibility of generating harmful substances such as dioxins. In addition, a neutralized product of sulfuric acid pitch, which is an industrial waste, can be used as a cement raw material and a fuel at the time of firing, and the waste can be recycled.

以下、本発明の硫酸ピッチの処理方法について実施例を挙げて説明する。
実施例1、比較例1〜3
硫酸ピッチ100質量部に対し、処理材(本発明の微粉末(実施例1)、普通ポルトランドセメント(比較例1)、消石灰(比較例2)および未処理(比較例3))を表1の割合で添加して混合攪拌し、得られた処理物を(1)ハンドリング性の評価、(2)臭気の評価、(3)有害重金属溶出量の評価の各試験に供した。
Hereinafter, the processing method for sulfuric acid pitch of the present invention will be described with reference to examples.
Example 1, Comparative Examples 1-3
Table 1 shows treatment materials (fine powder of the present invention (Example 1), ordinary Portland cement (Comparative Example 1), slaked lime (Comparative Example 2) and untreated (Comparative Example 3)) with respect to 100 parts by mass of sulfuric acid pitch. The mixture was added at a ratio and mixed and stirred, and the resulting processed product was subjected to (1) handling evaluation, (2) odor evaluation, and (3) harmful heavy metal elution amount evaluation.

Figure 0004686227
Figure 0004686227

ここで用いた硫酸ピッチの性状は、下記の通りである。
pH:1.9
SO3含有量:45重量%
(分析法:蛍光X線分析、ただし、油分、タール分を除く)
油分:8.0重量%(ヘキサン抽出物質)
タール分:35重量%(ジクロロメタン抽出物質)
Pb含有量:100ppm
The properties of the sulfuric acid pitch used here are as follows.
pH: 1.9
SO 3 content: 45% by weight
(Analysis method: X-ray fluorescence analysis, except oil and tar)
Oil content: 8.0% by weight (hexane extract)
Tar content: 35% by weight (dichloromethane extract material)
Pb content: 100ppm

試験方法:
「試験(1)」ハンドリング性の評価(処理後の性状)
処理物のハンドリング性の評価としては、タール分の混ざったドロドロ状かつ流動性のある状態を×とし、サラサラ状で粒状である状態を○とした。
「試験(2)」臭気の評価
処理物の臭気を、公害防止法で分類される5段階で評価した。
臭気強度0 臭いを感じない
1 やっと感知できる臭い(検知閾値)
2 何の臭いかわかる弱い臭い(認知閾値)
3 楽に感知できる臭い
4 強い臭い
5 強烈な臭い
「試験(3)」有害重金属溶出量の評価
表1の混合割合で攪拌混合した後、さらに、水を40質量部加えて混練成形し、試験(3)の供試体を作製した。7日後の供試体について環告13号に定められたPb溶出試験を実施した。
環告13号に定められたPb溶出基準は0.3ppm以下である。
Test method:
"Test (1)" handling property evaluation (property after treatment)
For the evaluation of the handleability of the treated product, a muddy and fluid state in which tar content was mixed was evaluated as x, and a smooth and granular state was evaluated as ◯.
“Test (2)” Evaluation of Odor The odor of the treated product was evaluated in five levels classified by the Pollution Control Law.
Odor intensity 0 No smell
1 Odor that can be finally detected (detection threshold)
2 Weak odor that understands what kind of odor (recognition threshold)
3 Easily perceived odor
4 Strong smell
5 Evaluation of Strong Odor “Test (3)” Hazardous Heavy Metal Elution Amount After stirring and mixing at the mixing ratio shown in Table 1, 40 parts by mass of water was further added and kneaded to prepare a specimen for Test (3). . The Pb elution test defined in Circular 13 was conducted on the specimens 7 days later.
The Pb elution standard defined in Circular 13 is 0.3 ppm or less.

試験結果:
試験(1)〜試験(3)の結果をそれぞれ表2〜4に示した。これらの試験結果から、従来の普通ポルトランドセメントや消石灰を用いて処理する場合において、再生骨材微粉末を用いて硫酸ピッチを処理すれば、中和にかかる材料コストを低減し、中和効果および処理後のハンドリング性が同等で、臭気の脱臭、有害重金属の固定化により効果があることがわかる。
Test results:
The results of Test (1) to Test (3) are shown in Tables 2 to 4, respectively. From these test results, when treating with conventional ordinary Portland cement or slaked lime, treating the sulfuric acid pitch with recycled aggregate fine powder reduces the material cost for neutralization, neutralizing effect and It can be seen that the handling properties after the treatment are the same, and the effect is obtained by deodorizing odors and fixing harmful heavy metals.

Figure 0004686227
Figure 0004686227

Figure 0004686227
Figure 0004686227

Figure 0004686227
Figure 0004686227

次に、実施例1で得られた本発明の中和処理物を、セメント原料及び焼成時の燃料として利用した。
実施例1の処理物を、セメント焼成設備の800℃以上の高温部であるロータリーキルン4の窯尻部4aに投入した。
セメント焼成設備としては、セメント焼成能力が単位時間当たり100tの設備を用い、窯尻部4aへの投入量は、単位時間当たり0.1〜1tとした。
これらの投入の結果、実施例1の処理物では、セメント焼成設備やセメントの品質への影響は認められなかった。
Next, the neutralized product of the present invention obtained in Example 1 was used as a cement raw material and a fuel for firing.
The processed product of Example 1 was put into the kiln bottom part 4a of the rotary kiln 4 which is a high temperature part of 800 ° C. or higher of the cement baking equipment.
As the cement firing facility, a facility having a cement firing capacity of 100 t per unit time was used, and the input amount to the kiln bottom part 4a was 0.1 to 1 t per unit time.
As a result of these inputs, the treated product of Example 1 showed no effect on the cement firing equipment or cement quality.

本発明の一実施形態であるセメント製造設備に付設した硫酸ピッチの処理装置を示す模式図である。It is a schematic diagram which shows the processing apparatus of the sulfuric acid pitch attached to the cement manufacturing equipment which is one Embodiment of this invention.

符号の説明Explanation of symbols

1 原料ミル
2 サイクロン
3 セメント原料貯蔵庫
4、4a、4b ロータリーキルン
5 クリンカークーラ
6 仮焼炉
7 サスペンションプレヒータ
7a〜7d サイクロン
8 2次ダクト
9 電気集塵機
10 排気煙突
11 バーナー
12 クーラ排気ライン
13 セメント原料供給ライン
14 セメント原料粉供給ライン
15 セメントクリンカー搬送ライン
21 硫酸ピッチの処理装置
22 中和処理槽
23 粒状化装置
24 ホッパ
25 投入ライン
DESCRIPTION OF SYMBOLS 1 Raw material mill 2 Cyclone 3 Cement raw material storage 4, 4a, 4b Rotary kiln 5 Clinker cooler 6 Calciner furnace 7 Suspension preheater 7a-7d Cyclone 8 Secondary duct 9 Electric dust collector 10 Exhaust chimney 11 Burner 12 Cooler exhaust line 13 Cement raw material supply line 14 Cement raw material powder supply line 15 Cement clinker transport line 21 Sulfuric acid pitch processing device 22 Neutralization processing tank 23 Granulating device 24 Hopper 25 Input line

Claims (4)

石油精製過程にて生じた硫酸ピッチをコンクリート廃材から再生骨材回収時に生じる微粉末で中和処理することを特徴とする硫酸ピッチの処理方法であって、該微粉末が、コンクリート廃材を加熱し、モルタル部分と骨材部分の付着を弱くしてから、骨材部分を破砕しない程度に粉砕、磨砕を行い、得られた破砕物から分別して得るものであり、かつ、該微粉末は、平均粒径が0.10mm以下、比表面積が4000〜10000cm2/gであるセメント水和物と、最大粒径が5mm以下である細骨材を含み、その含有割合はセメント水和物1質量部に対して細骨材0.1〜5質量部である、硫酸ピッチの処理方法。 A method for treating sulfuric acid pitch, characterized in that the sulfuric acid pitch generated in the petroleum refining process is neutralized with a fine powder generated during recovery of recycled aggregate from concrete waste, wherein the fine powder heats the concrete waste. , After weakening the adhesion of the mortar part and the aggregate part, pulverized and ground to such an extent that the aggregate part is not crushed, and obtained by separating from the obtained crushed material, and the fine powder, A cement hydrate having an average particle size of 0.10 mm or less and a specific surface area of 4000 to 10000 cm 2 / g and a fine aggregate having a maximum particle size of 5 mm or less, the content ratio of which is 1 mass of cement hydrate The processing method of the sulfuric acid pitch which is 0.1-5 mass parts of fine aggregates with respect to a part . 請求項1に記載の中和処理で得られた硫酸ピッチの処理物を粒状化または塊状化し、これをセメント焼成工程の原料又は助燃材として利用する硫酸ピッチの処理方法。   A method for treating sulfuric acid pitch, wherein the treated product of the sulfuric acid pitch obtained by the neutralization treatment according to claim 1 is granulated or agglomerated and used as a raw material or a combustion aid for a cement firing step. 粒状化または塊状化した硫酸ピッチの処理物をセメント製造設備の800℃以上の高温部に投入することにより行う請求項2に記載の硫酸ピッチの処理方法。   The method for treating a sulfuric acid pitch according to claim 2, wherein the treated product of the granulated or agglomerated sulfuric acid pitch is put into a high temperature part of 800 ° C or higher of a cement production facility. 石油精製過程にて生じた硫酸ピッチを請求項1に記載のコンクリート廃材から再生骨材回収時に生じる微粉末と混合する中和処理槽と、中和処理で得られた硫酸ピッチの処理物を粒状化または塊状化する手段と、粒状化または塊状化した硫酸ピッチの処理物をセメント製造設備の800℃以上の高温部に投入する投入手段とを備える硫酸ピッチの処理装置。   The neutralization tank which mixes the sulfuric acid pitch produced in the petroleum refining process with the fine powder produced at the time of recovery aggregate recovery from the concrete waste according to claim 1, and the processed product of the sulfuric acid pitch obtained by the neutralization process An apparatus for treating sulfuric acid pitch, comprising: means for forming or lumping, and charging means for charging a granulated or lumped processed product of sulfuric acid pitch into a high temperature part of a cement production facility at 800 ° C. or higher.
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