JP2009248036A - Method for desulfurizing exhaust gas - Google Patents

Method for desulfurizing exhaust gas Download PDF

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JP2009248036A
JP2009248036A JP2008101372A JP2008101372A JP2009248036A JP 2009248036 A JP2009248036 A JP 2009248036A JP 2008101372 A JP2008101372 A JP 2008101372A JP 2008101372 A JP2008101372 A JP 2008101372A JP 2009248036 A JP2009248036 A JP 2009248036A
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exhaust gas
zinc
sulfur dioxide
slurry
zno
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Nobuyoshi Sogabe
信義 曽我部
Hisaji Shimomura
寿冶 下村
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Mitsui Mining and Smelting Co Ltd
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Mitsui Mining and Smelting Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for desulfurizing exhaust gas where the absorption efficiency of sulfur dioxide is better than that with zinc dioxide slurry. <P>SOLUTION: The method for desulfurizing exhaust gas that collects sulfur dioxide from the exhaust gas generated by burn-out of zinc concentrate, wherein sulfur dioxide is collected by absorbing sulfur dioxide with zinc hydroxide slurry, and this allows sulfur dioxide to be more efficiently absorbed than that in a conventional method where zinc oxide is utilized, thereby enabling the system to increase the refinement efficiency of a product (zinc) in a zinc refinement is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、排ガスの脱硫方法に関するものである。   The present invention relates to an exhaust gas desulfurization method.

従来、亜鉛製錬においては、亜鉛精鉱（ＺｎＳ）を焙焼した際に発生する排ガスに含まれる硫黄酸化物、例えば、二酸化硫黄を回収するのに亜鉛精鉱（ＺｎＳ）を焙焼して得られる酸化亜鉛（ＺｎＯ）を用い、酸化亜鉛（ＺｎＯ）スラリに吸収させ回収していた（例えば、非特許文献１参照）。   Conventionally, in zinc smelting, zinc concentrate (ZnS) is roasted to recover sulfur oxides, for example, sulfur dioxide contained in exhaust gas generated when zinc concentrate (ZnS) is roasted. The obtained zinc oxide (ZnO) was absorbed and recovered by a zinc oxide (ZnO) slurry (see, for example, Non-Patent Document 1).

日本鉱業会誌Vol.87, 1003号 P.721, １９７１年９月発行Journal of the Japan Mining Association Vol.87, 1003, P.721, published in September 1971

しかしながら、酸化亜鉛（ＺｎＯ）スラリは、反応速度の点で二酸化硫黄の吸収効率が必ずしも良好とは言えないという問題があった。   However, zinc oxide (ZnO) slurry has a problem that the absorption efficiency of sulfur dioxide is not necessarily good in terms of reaction rate.

本発明は、上記に鑑みてなされたものであって、二酸化硫黄の吸収効率が酸化亜鉛スラリよりも優れた排ガスの脱硫方法を提供することを目的とする。   This invention is made | formed in view of the above, Comprising: It aims at providing the desulfurization method of the waste gas in which the absorption efficiency of sulfur dioxide was superior to the zinc oxide slurry.

上述した課題を解決し、目的を達成するために、本発明の排ガスの脱硫方法は、亜鉛精鉱の焙焼によって発生する排ガスから二酸化硫黄を回収する排ガスの脱硫方法であって、前記二酸化硫黄を水酸化亜鉛スラリに吸収させて回収することを特徴とする。   In order to solve the above-described problems and achieve the object, the exhaust gas desulfurization method of the present invention is an exhaust gas desulfurization method for recovering sulfur dioxide from exhaust gas generated by roasting zinc concentrate, and the sulfur dioxide Is recovered by being absorbed in a zinc hydroxide slurry.

本発明の排ガスの脱硫方法によって二酸化硫黄を水酸化亜鉛スラリに吸収させて回収すると、酸化亜鉛を使用する従来の方法に比べて吸収効率が優れているので、亜鉛製錬における製品（亜鉛）の製錬効率を上げることができるという効果を奏する。   When the sulfur dioxide is absorbed and recovered by the zinc hydroxide slurry by the exhaust gas desulfurization method of the present invention, the absorption efficiency is superior to the conventional method using zinc oxide. There is an effect that the smelting efficiency can be increased.

以下、本発明の排ガスの脱硫方法にかかる実施の形態１について、図面を参照して詳細に説明する。図１は、本発明の排ガスの脱硫方法を使用する亜鉛製錬工程の要部を説明する図である。   Hereinafter, Embodiment 1 according to the exhaust gas desulfurization method of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram for explaining a main part of a zinc smelting process using the exhaust gas desulfurization method of the present invention.

亜鉛製錬工程は、図１に示すように、焙焼炉１内で酸素の存在下に亜鉛含有率５０％程度の亜鉛精鉱（ＺｎＳ）を９００〜１０００℃で焙焼し、得られるＺｎ含有率６０％程度の酸化亜鉛（ＺｎＯ）を引き続く溶解工程で精製して最終製品である亜鉛カソード（Ｚｎ含有率９９．９９５％）とする。この亜鉛精鉱（ＺｎＳ）の焙焼に伴い、次式で表される反応が進行し、焙焼炉１からは主に二酸化硫黄（ＳＯ2）を含む排ガスが排出される。
ＺｎＳ＋３／２Ｏ2→ＺｎＯ＋ＳＯ2 In the zinc smelting step, as shown in FIG. 1, zinc concentrate (ZnS) having a zinc content of about 50% is roasted at 900 to 1000 ° C. in the presence of oxygen in the roasting furnace 1. Zinc oxide (ZnO) with a content rate of about 60% is refined in the subsequent dissolution step to obtain the final product zinc cathode (Zn content 99.995%). As the zinc concentrate (ZnS) is roasted, the reaction represented by the following formula proceeds, and exhaust gas containing mainly sulfur dioxide (SO 2 ) is discharged from the roasting furnace 1.
ZnS + 3 / 2O 2 → ZnO + SO 2

このため、焙焼炉１から排出される排ガスを以下のようにして脱硫処理する。先ず、排ガスは、図１に示すように、廃熱ボイラ２へ導かれ、５００℃程度に温度を下げられる。次に、温度を下げられた排ガスは、サイクロン３へ導入されて空気流によって微細な固形成分が除去された後、ホットコットレル４において電気的集塵処理が施される。この間に除去された固形成分は、酸化亜鉛（ＺｎＯ）と共に溶解工程へ導入されて亜鉛カソードの精製に使用される。   For this reason, the exhaust gas discharged | emitted from the roasting furnace 1 is desulfurized as follows. First, as shown in FIG. 1, the exhaust gas is led to the waste heat boiler 2 and the temperature is lowered to about 500 ° C. Next, the exhaust gas whose temperature has been lowered is introduced into the cyclone 3, and fine solid components are removed by an air flow. The solid component removed during this period is introduced into the dissolution process together with zinc oxide (ZnO) and used for purification of the zinc cathode.

次いで、ホットコットレル４から排出された排ガスは、図１に示すように、増湿塔５へ導入され、湿度を付与することによって微細な塵が除去される。その後、排ガスは、冷却塔６を経てミストコットレル７へ導入され、湿式電気集塵処理が施される。この間に除去された微細な塵は、排ガス吸収塔１１へと送られる。   Next, the exhaust gas discharged from the hot cot rel 4 is introduced into the humidification tower 5 as shown in FIG. 1, and fine dust is removed by applying humidity. Thereafter, the exhaust gas is introduced into the mist cot rel 7 through the cooling tower 6 and subjected to wet electric dust collection. The fine dust removed during this time is sent to the exhaust gas absorption tower 11.

このようにして除塵処理が施された排ガスは、図１に示すように、乾燥塔８へ導入して乾燥処理が施される。次に、排ガスは、転化器９へ送られ、二酸化硫黄（ＳＯ2）が三酸化硫黄（ＳＯ3）に酸化処理される。次いで、三酸化硫黄（ＳＯ3）に酸化処理された排ガスは、吸収塔１０へ送られ、水に吸収させて硫酸（Ｈ2ＳＯ4）として回収される。 As shown in FIG. 1, the exhaust gas thus subjected to the dust removal treatment is introduced into the drying tower 8 and subjected to the drying treatment. Next, the exhaust gas is sent to the converter 9, where sulfur dioxide (SO 2 ) is oxidized to sulfur trioxide (SO 3 ). Next, the exhaust gas oxidized to sulfur trioxide (SO 3 ) is sent to the absorption tower 10, absorbed in water, and recovered as sulfuric acid (H 2 SO 4 ).

このようにして硫酸（Ｈ2ＳＯ4）として三酸化硫黄（ＳＯ3）が回収された排ガスは、濃度４，０００ｐｐｍ以下の二酸化硫黄（ＳＯ2）を含んでおり、排ガス吸収塔１１へ導入されて二酸化硫黄（ＳＯ2）が湿式処理によって大気排出基準以下に脱硫される。このとき、本発明の排ガスの脱硫方法は、従来から使用されてきた酸化亜鉛（ＺｎＯ）のスラリに代えて水酸化亜鉛（Ｚｎ(ＯＨ)2）のスラリを排ガス吸収塔１１において使用する。 The exhaust gas from which sulfur trioxide (SO 3 ) is recovered as sulfuric acid (H 2 SO 4 ) in this way contains sulfur dioxide (SO 2 ) having a concentration of 4,000 ppm or less and is introduced into the exhaust gas absorption tower 11. Thus, sulfur dioxide (SO 2 ) is desulfurized to below the atmospheric emission standard by wet processing. At this time, in the exhaust gas desulfurization method of the present invention, a slurry of zinc hydroxide (Zn (OH) 2 ) is used in the exhaust gas absorption tower 11 in place of the conventionally used slurry of zinc oxide (ZnO).

排ガス吸収塔１１は、図２に示すように、本体１１ａの下部に三酸化硫黄（ＳＯ3）を回収した排ガスを導入する導入配管１１ｂが設けられ、内部上部には、シャワーパイプ１１ｃが複数段配管されている。また、排ガス吸収塔１１は、水酸化亜鉛（Ｚｎ(ＯＨ)2）のスラリを貯留したスラリ槽１２と循環ポンプ１３が本体１１ａに併設されている。スラリ槽１２は、水酸化亜鉛（Ｚｎ(ＯＨ)2）のスラリを撹拌する撹拌翼１２ａを備えている。 As shown in FIG. 2, the exhaust gas absorption tower 11 is provided with an introduction pipe 11b for introducing exhaust gas from which sulfur trioxide (SO 3 ) has been recovered at the lower part of the main body 11a, and a plurality of shower pipes 11c are provided at the upper part inside. It is piped. Further, in the exhaust gas absorption tower 11, a slurry tank 12 storing a slurry of zinc hydroxide (Zn (OH) 2 ) and a circulation pump 13 are provided in the main body 11a. The slurry tank 12 includes a stirring blade 12a for stirring the slurry of zinc hydroxide (Zn (OH) 2 ).

以上のように構成される排ガス吸収塔１１は、配管１４によって供給される水酸化亜鉛（Ｚｎ(ＯＨ)2）のスラリをシャワーパイプ１１ｃから噴出させ、このスラリをスラリ槽１２に回収して循環ポンプ１３によって配管１４を通って循環させると共に、下部の導入配管１１ｂから排ガスを連続的に導入し、ファンによって上方へ送り出す。これにより、排ガスは、噴出する水酸化亜鉛（Ｚｎ(ＯＨ)2）のスラリと接触し、残存する二酸化硫黄（ＳＯ2）が次式で示す反応式の下に水酸化亜鉛（Ｚｎ(ＯＨ)2）に吸収され、大気排出基準以下に脱硫される。
Ｚｎ(ＯＨ)2＋ＳＯ2→ＺｎＳＯ3↓＋Ｈ2Ｏ The exhaust gas absorption tower 11 configured as described above causes a slurry of zinc hydroxide (Zn (OH) 2 ) supplied by the pipe 14 to be ejected from the shower pipe 11c, and this slurry is collected in the slurry tank 12 and circulated. While circulating through the pipe 14 by the pump 13, exhaust gas is continuously introduced from the lower introduction pipe 11b and sent upward by a fan. As a result, the exhaust gas comes into contact with the slurry of jetted zinc hydroxide (Zn (OH) 2 ), and the remaining sulfur dioxide (SO 2 ) is zinc hydroxide (Zn (OH) under the reaction formula shown below. 2 ) absorbed and desulfurized below the atmospheric emission standard.
Zn (OH) 2 + SO 2 → ZnSO 3 ↓ + H 2 O

この結果、排ガス吸収塔１１は、底部に亜硫酸亜鉛（ＺｎＳＯ3）が沈殿する。沈殿した亜硫酸亜鉛（ＺｎＳＯ3）は、一定時間ごとに回収すると共に、二酸化硫黄（ＳＯ2）の吸収に伴う亜硫酸亜鉛（ＺｎＳＯ3）の沈殿による水酸化亜鉛（Ｚｎ(ＯＨ)2）の濃度低下を補うため、スラリ槽１２には水酸化亜鉛（Ｚｎ(ＯＨ)2）が一定時間ごとに補充される。このようして回収された亜硫酸亜鉛（ＺｎＳＯ3）は、焙焼塔１へ戻されて焙焼され、酸化亜鉛（ＺｎＯ）の製造に再利用される。 As a result, the exhaust gas absorption tower 11 has zinc sulfite (ZnSO 3 ) precipitated at the bottom. The precipitated zinc sulfite (ZnSO 3 ) is collected at regular intervals, and the concentration of zinc hydroxide (Zn (OH) 2 ) decreases due to the precipitation of zinc sulfite (ZnSO 3 ) due to the absorption of sulfur dioxide (SO 2 ). In order to compensate for this, the slurry tank 12 is replenished with zinc hydroxide (Zn (OH) 2 ) at regular intervals. The zinc sulfite (ZnSO 3 ) recovered in this manner is returned to the roasting tower 1 and roasted and reused for the production of zinc oxide (ZnO).

このとき、本発明の排ガスの脱硫方法は、焙焼炉１から得られる酸化亜鉛（ＺｎＯ）の一部を使用し、以下の反応式に示すように、吸収塔１０から回収された硫酸（Ｈ2ＳＯ4）で処理して得られる硫酸亜鉛（ＺｎＳＯ4）を水酸化ナトリウム（ＮａＯＨ）等のアルカリ剤によってｐＨ６以上に中和処理して得られる水酸化亜鉛（Ｚｎ(ＯＨ)2）を使用する。
ＺｎＯ＋Ｈ2ＳＯ4→ＺｎＳＯ4＋Ｈ2Ｏ
ＺｎＳＯ4＋２ＮａＯＨ→Ｚｎ(ＯＨ)2↓＋Ｎａ2ＳＯ4 At this time, the exhaust gas desulfurization method of the present invention uses a part of zinc oxide (ZnO) obtained from the roasting furnace 1, and as shown in the following reaction formula, sulfuric acid (H Use zinc hydroxide (Zn (OH) 2 ) obtained by neutralizing zinc sulfate (ZnSO 4 ) obtained by treatment with 2 SO 4 ) to pH 6 or higher with an alkali agent such as sodium hydroxide (NaOH) To do.
ZnO + H 2 SO 4 → ZnSO 4 + H 2 O
ZnSO 4 + 2NaOH → Zn (OH) 2 ↓ + Na 2 SO 4

ここで、水酸化亜鉛（Ｚｎ(ＯＨ)2）を用いた本発明方法の脱硫効果と酸化亜鉛（ＺｎＯ）を用いた従来方法の脱硫効果とを実験によって比較した。用いた実験装置の構成を図３に示す。図３に示すように、実験装置２０は、排ガス吸収部２１と濃度測定部２２とを有している。 Here, the desulfurization effect of the method of the present invention using zinc hydroxide (Zn (OH) 2 ) and the desulfurization effect of the conventional method using zinc oxide (ZnO) were compared by experiments. The configuration of the experimental apparatus used is shown in FIG. As shown in FIG. 3, the experimental apparatus 20 includes an exhaust gas absorption unit 21 and a concentration measurement unit 22.

排ガス吸収部２１は、濃度１５０ｇ／Ｌの酸化亜鉛（ＺｎＯ）スラリ９００ｍＬを収容し、このスラリを撹拌する撹拌翼２１ａを気密に設けた容器であり、この容器に排ガス供給管２３と、スラリを補給する補給管２１ｂとが気密に接続されている。濃度測定部２２は、濃度３重量％の過酸化水素水を保持すると共に、排ガス吸収部２１との間を気密に接続して排ガス吸収部２１内の二酸化硫黄（ＳＯ2）ガスを導く配管２４を有している。ここで、過酸化水素水は、酸化亜鉛（ＺｎＯ）スラリに吸収されなかった二酸化硫黄（ＳＯ2）ガスを吸収する。また、濃度測定部２２は、気密に接続した配管２５に流量計２６及びエアーポンプ２７が設けられ、過酸化水素水に殆ど二酸化硫黄（ＳＯ2）ガスを吸収された気体を配管２５を介して外部へ排出する。 The exhaust gas absorption unit 21 is a container that contains 900 mL of zinc oxide (ZnO) slurry having a concentration of 150 g / L, and is provided with an airtight stirring blade 21 a that stirs the slurry. The exhaust gas supply pipe 23 and the slurry are placed in the container. The replenishment pipe 21b to be replenished is airtightly connected. The concentration measuring unit 22 holds a hydrogen peroxide solution having a concentration of 3% by weight, and connects the exhaust gas absorbing unit 21 in an airtight manner to guide the sulfur dioxide (SO 2 ) gas in the exhaust gas absorbing unit 21. have. Here, the hydrogen peroxide solution absorbs sulfur dioxide (SO 2 ) gas that has not been absorbed by the zinc oxide (ZnO) slurry. Further, the concentration measuring unit 22 is provided with a flow meter 26 and an air pump 27 in an airtightly connected pipe 25, and a gas in which sulfur dioxide (SO 2 ) gas is almost absorbed in hydrogen peroxide water is passed through the pipe 25. Discharge outside.

以上のように構成される実験装置２０を用い、１０ｇの水酸化亜鉛（Ｚｎ(ＯＨ)2）を１００ｍＬの純水に混合したスラリを補給管２１ｂから排ガス吸収部２１に補給すると共に、濃度３，８００ｐｐｍの二酸化硫黄（ＳＯ2）ガスを排ガス供給管２３から４Ｌ／分の流速で供給しながら、濃度測定部２２から過酸化水素水を採取し、過酸化水素水に吸収された二酸化硫黄（ＳＯ2）ガス濃度を、実験開始時を含めて１時間ごとに測定した。その結果を、図４に示す。 Using the experimental apparatus 20 configured as described above, a slurry prepared by mixing 10 g of zinc hydroxide (Zn (OH) 2 ) with 100 mL of pure water is replenished to the exhaust gas absorber 21 from the replenishment pipe 21b, and the concentration is 3 , 800 ppm of sulfur dioxide (SO 2 ) gas is supplied from the exhaust gas supply pipe 23 at a flow rate of 4 L / min, and the hydrogen peroxide solution is collected from the concentration measuring unit 22 and the sulfur dioxide absorbed in the hydrogen peroxide solution ( The SO 2 ) gas concentration was measured every hour including the start of the experiment. The result is shown in FIG.

比較のため、水酸化亜鉛（Ｚｎ(ＯＨ)2）に代えて、１０ｇの酸化亜鉛（ＺｎＯ）を１００ｍＬの純水に混合したスラリを補給管２１ｂから排ガス吸収部２１に補給し、前記と同様にして、濃度測定部２２の過酸化水素水に吸収された二酸化硫黄（ＳＯ2）ガス濃度を測定した。その結果を、併せて図４に示す。ここで、酸化亜鉛（ＺｎＯ）による二酸化硫黄（ＳＯ2）の湿式処理に基づく吸収反応は次式で示され、生じた亜硫酸亜鉛（ＺｎＳＯ3）は濃硫酸を添加することにより元の酸化亜鉛（ＺｎＯ）と二酸化硫黄（ＳＯ2）に分解される。
ＺｎＯ＋ＳＯ2→ＺｎＳＯ3 For comparison, in place of zinc hydroxide (Zn (OH) 2 ), a slurry prepared by mixing 10 g of zinc oxide (ZnO) with 100 mL of pure water is supplied to the exhaust gas absorption unit 21 from the supply pipe 21b. Thus, the concentration of sulfur dioxide (SO 2 ) gas absorbed in the hydrogen peroxide solution of the concentration measuring unit 22 was measured. The results are also shown in FIG. Here, the absorption reaction based on the wet treatment of sulfur dioxide (SO 2 ) with zinc oxide (ZnO) is represented by the following equation, and the resulting zinc sulfite (ZnSO 3 ) is added to the original zinc oxide (ZnSO 3 ) by adding concentrated sulfuric acid. It is decomposed into ZnO) and sulfur dioxide (SO 2 ).
ZnO + SO 2 → ZnSO 3

以上のようにして測定した結果を図４に示す。水酸化亜鉛（Ｚｎ(ＯＨ)2）は、図４に示すように、脱硫開始から約３時間に亘って二酸化硫黄（ＳＯ2）の濃度を１５０ｐｐｍ以下に保持できたのに対し、酸化亜鉛（ＺｎＯ）は脱硫開始から約２．５時間しか１５０ｐｐｍ以下に保持できなかった。従って、水酸化亜鉛（Ｚｎ(ＯＨ)2）は、酸化亜鉛（ＺｎＯ）に比べて二酸化硫黄（ＳＯ2）の吸収効率が高いことが解る。このため、水酸化亜鉛（Ｚｎ(ＯＨ)2）を使用した場合、スラリ槽１２に補充するスラリの補充頻度を酸化亜鉛（ＺｎＯ）の場合に比べて少なくすることができ、焙焼炉１から取り出して排ガス処理に使用する酸化亜鉛（ＺｎＯ）の量を減らすことができる。 The results measured as described above are shown in FIG. As shown in FIG. 4, zinc hydroxide (Zn (OH) 2 ) was able to maintain the concentration of sulfur dioxide (SO 2 ) at 150 ppm or less for about 3 hours from the start of desulfurization, while zinc oxide ( ZnO) could only be kept below 150 ppm for about 2.5 hours from the start of desulfurization. Therefore, it can be seen that zinc hydroxide (Zn (OH) 2 ) has higher absorption efficiency of sulfur dioxide (SO 2 ) than zinc oxide (ZnO). For this reason, when zinc hydroxide (Zn (OH) 2 ) is used, the replenishment frequency of the slurry to be replenished to the slurry tank 12 can be reduced as compared with the case of zinc oxide (ZnO). The amount of zinc oxide (ZnO) taken out and used for exhaust gas treatment can be reduced.

尚、上述の実施の形態においては、排ガス吸収塔１１は、焙焼炉１から得られる酸化亜鉛（ＺｎＯ）を原料とする水酸化亜鉛（Ｚｎ(ＯＨ)2）を使用して硫酸（Ｈ2ＳＯ4）回収後に残存する二酸化硫黄（ＳＯ2）を脱硫した。但し、本発明の排ガスの脱硫方法は、水酸化亜鉛（Ｚｎ(ＯＨ)2）を使用して二酸化硫黄（ＳＯ2）を湿式処理により回収すればよい。 In the above-described embodiment, the exhaust gas absorption tower 11 uses sulfuric acid (H 2 ) using zinc hydroxide (Zn (OH) 2 ) made of zinc oxide (ZnO) obtained from the roasting furnace 1 as a raw material. SO 4 ) Sulfur dioxide (SO 2 ) remaining after recovery was desulfurized. However, in the exhaust gas desulfurization method of the present invention, sulfur dioxide (SO 2 ) may be recovered by wet treatment using zinc hydroxide (Zn (OH) 2 ).

このため、脱硫に用いる水酸化亜鉛（Ｚｎ(ＯＨ)2）は、例えば、建築材料，自動車，鉄スクラップ等のリサイクル原料から得られる製鋼煙灰から鉄を除去した酸化亜鉛（ＺｎＯ）を原料とし、この酸化亜鉛（ＺｎＯ）を湿式処理し、アルカリで中和して得られるフッ素（Ｆ），塩素（Ｃｌ），炭素（Ｃ），水素（Ｈ），酸素（Ｏ），硫黄（Ｓ）を１つ以上含むものを使用してもよい。このようなリサイクル原料を使用した水酸化亜鉛（Ｚｎ(ＯＨ)2）は、安価に利用できるうえ、環境に優しいという利点を有している。 For this reason, zinc hydroxide (Zn (OH) 2 ) used for desulfurization is made from, for example, zinc oxide (ZnO) obtained by removing iron from steelmaking smoke ash obtained from recycled materials such as building materials, automobiles, and iron scrap. Fluorine (F), chlorine (Cl), carbon (C), hydrogen (H), oxygen (O), sulfur (S) obtained by wet treatment of this zinc oxide (ZnO) and neutralization with alkali is 1 You may use what contains two or more. Zinc hydroxide (Zn (OH) 2 ) using such recycled raw materials has the advantage that it can be used at low cost and is environmentally friendly.

本発明の排ガスの脱硫方法を使用する亜鉛製錬工程の要部を説明する図である。It is a figure explaining the principal part of the zinc smelting process which uses the desulfurization method of the waste gas of this invention. 排ガス吸収塔の構成と排ガス吸収塔における二酸化硫黄の脱硫を説明する概略構成図である。It is a schematic block diagram explaining the structure of an exhaust gas absorption tower and desulfurization of sulfur dioxide in the exhaust gas absorption tower. 水酸化亜鉛を用いた本発明方法の脱硫効果と酸化亜鉛を用いた従来方法の脱硫効果の比較に用いた実験装置の構成図である。It is a block diagram of the experimental apparatus used for the comparison of the desulfurization effect of the method of the present invention using zinc hydroxide and the desulfurization effect of the conventional method using zinc oxide. 排ガス吸収塔において、二酸化硫黄を酸化亜鉛のスラリを使用して脱硫する場合と、水酸化亜鉛のスラリを使用して脱硫する場合とにおける排ガス中の二酸化硫黄濃度の時間変化を示す図である。It is a figure which shows the time change of the sulfur dioxide density | concentration in waste gas in the case where sulfur dioxide is desulfurized using the slurry of zinc oxide in the exhaust gas absorption tower, and the case where it is desulfurized using the slurry of zinc hydroxide.

符号の説明Explanation of symbols

１ 焙焼炉
２ 廃熱ボイラ
３ サイクロン
４ ホットコットレル
５ 増湿塔
６ 冷却塔
７ ミストコットレル
８ 乾燥塔
９ 転化器
１０ 吸収塔
１１ 排ガス吸収塔
１２ スラリ槽
１３ 循環ポンプ
１４ 配管
２０ 実験装置
２１ 排ガス吸収部
２２ 濃度測定部
２３ 排ガス供給管
２４ 配管
２５ 配管
２６ 流量計
２７ エアーポンプ DESCRIPTION OF SYMBOLS 1 Roasting furnace 2 Waste heat boiler 3 Cyclone 4 Hot cot rel 5 Humidification tower 6 Cooling tower 7 Mist cot rel 8 Drying tower 9 Converter 10 Absorption tower 11 Exhaust gas absorption tower 12 Slurry tank 13 Circulation pump 14 Piping 20 Experimental apparatus 21 Exhaust gas absorption Section 22 Concentration measuring section 23 Exhaust gas supply pipe 24 Pipe 25 Pipe 26 Flow meter 27 Air pump

Claims (1)

亜鉛精鉱の焙焼によって発生する排ガスから二酸化硫黄を回収する排ガスの脱硫方法であって、
前記二酸化硫黄を水酸化亜鉛スラリに吸収させて回収することを特徴とする排ガスの脱硫方法。 An exhaust gas desulfurization method for recovering sulfur dioxide from exhaust gas generated by roasting zinc concentrate,
An exhaust gas desulfurization method, wherein the sulfur dioxide is absorbed by zinc hydroxide slurry and recovered.
JP2008101372A 2008-04-09 2008-04-09 Method for desulfurizing exhaust gas Pending JP2009248036A (en)

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CN102755826A (en) * 2012-07-06 2012-10-31 江苏恒丰伟业科技工程有限公司 Tail gas desulfuration adopting zinc oxide method in smelting industry
CN103471404A (en) * 2013-09-05 2013-12-25 山东金升有色集团有限公司 Unit of recovering flue gas waste heat and dust in nonferrous metal smelting
CN106422731A (en) * 2016-08-31 2017-02-22 上海京藤化工有限公司 Tail gas absorption device for sulfuric acid production device
CN108939896A (en) * 2018-08-30 2018-12-07 西北矿冶研究院 Waste heat boiler water desulfurization device and method
CN109569255A (en) * 2018-11-29 2019-04-05 株洲冶炼集团股份有限公司 A kind of zinc abstraction system flue gas desulfurization technique
CN109985509A (en) * 2019-05-08 2019-07-09 安徽铜冠有色金属（池州）有限责任公司 A kind of zinc oxide method form waste gas of sulfur dioxide treatment process
CN112510279A (en) * 2019-09-16 2021-03-16 河南永续再生资源有限公司 Regenerated lead smelting soot desulfurization process
CN116116206A (en) * 2022-12-16 2023-05-16 河北博泰环保科技有限公司 Synergistic desulfurization method using secondary zinc oxide secondary dust

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102755826A (en) * 2012-07-06 2012-10-31 江苏恒丰伟业科技工程有限公司 Tail gas desulfuration adopting zinc oxide method in smelting industry
CN102755826B (en) * 2012-07-06 2014-11-12 江苏恒丰伟业科技工程有限公司 Tail gas desulfuration adopting zinc oxide method in smelting industry
CN103471404A (en) * 2013-09-05 2013-12-25 山东金升有色集团有限公司 Unit of recovering flue gas waste heat and dust in nonferrous metal smelting
CN106422731A (en) * 2016-08-31 2017-02-22 上海京藤化工有限公司 Tail gas absorption device for sulfuric acid production device
CN108939896A (en) * 2018-08-30 2018-12-07 西北矿冶研究院 Waste heat boiler water desulfurization device and method
CN109569255A (en) * 2018-11-29 2019-04-05 株洲冶炼集团股份有限公司 A kind of zinc abstraction system flue gas desulfurization technique
CN109985509A (en) * 2019-05-08 2019-07-09 安徽铜冠有色金属（池州）有限责任公司 A kind of zinc oxide method form waste gas of sulfur dioxide treatment process
CN112510279A (en) * 2019-09-16 2021-03-16 河南永续再生资源有限公司 Regenerated lead smelting soot desulfurization process
CN116116206A (en) * 2022-12-16 2023-05-16 河北博泰环保科技有限公司 Synergistic desulfurization method using secondary zinc oxide secondary dust

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