JPH11128873A - Heavy metal recovering device for molten fly ash - Google Patents
Heavy metal recovering device for molten fly ashInfo
- Publication number
- JPH11128873A JPH11128873A JP29718497A JP29718497A JPH11128873A JP H11128873 A JPH11128873 A JP H11128873A JP 29718497 A JP29718497 A JP 29718497A JP 29718497 A JP29718497 A JP 29718497A JP H11128873 A JPH11128873 A JP H11128873A
- Authority
- JP
- Japan
- Prior art keywords
- solid
- heavy metal
- solution
- fly ash
- liquid separation
- 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
Links
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、廃棄物の溶融処理
設備で発生する溶融飛灰から重金属を回収する、溶融飛
灰の重金属回収設備に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for recovering heavy metal from molten fly ash, which recovers heavy metal from molten fly ash generated in a waste melting facility.
【０００２】[0002]
【従来の技術】一般に、溶融飛灰はセメントまたはキレ
ートにより重金属の安定化処理を行った後、埋め立て処
分されることが多い。2. Description of the Related Art Generally, molten fly ash is often landfilled after stabilizing heavy metals with cement or chelate.
【０００３】しかし、埋め立て処分場の確保は次第に困
難になっており、且つセメントやキレートによる安定化
処理の長期的な安全性も疑問視されている。そこで、重
金属を濃縮回収してリサイクルする方法が提案されてい
る。重金属の回収には、乾式、湿式の処理方法がある
が、現在湿式処理が多い。[0003] However, it has become increasingly difficult to secure landfill sites, and long-term safety of stabilizing treatment with cement or chelate has been questioned. Therefore, a method of concentrating and recovering heavy metals for recycling has been proposed. There are dry and wet treatment methods for recovering heavy metals, but currently there are many wet treatments.
【０００４】従来の湿式の処理では、溶融飛灰に塩酸等
の酸性薬剤を添加して重金属を溶解し、この溶液を固液
分離した後、分離された重金属含有溶液に硫化水素ナト
リウムや硫化ナトリウム等のアルカリ性薬剤を添加して
ＯＲＰ計またはｐＨ計によりモニターしながら沈殿操作
を行い、重金属を硫化物として沈殿させ重金属含有スラ
ッジを生成させる。沈殿した重金属含有スラッジは水洗
いされて精錬原料となる。処理工程から発生する排水
は、ｐＨ調整により有害物質を固形物化して除去し放流
する。In the conventional wet treatment, an acidic agent such as hydrochloric acid is added to molten fly ash to dissolve heavy metals, and this solution is solid-liquid separated. Then, the separated heavy metal-containing solution is added to sodium hydrogen sulfide or sodium sulfide. A precipitation operation is performed by adding an alkaline agent such as the above while monitoring with an ORP meter or a pH meter to precipitate heavy metals as sulfides to generate heavy metal-containing sludge. The precipitated heavy metal-containing sludge is washed with water to become a raw material for refining. The wastewater generated from the treatment step is solidified to remove harmful substances by pH adjustment and discharged.
【０００５】[0005]
【発明が解決しようとする課題】しかし、重金属を硫化
物として回収する場合、アルカリ性薬剤を精度良く添加
しないと硫化水素等による激しい異臭を生ずるおそれが
あり、その対策のための設備が必要になる。しかも、回
収したスラジを精錬するには、まずばい焼して酸化物と
する工程が必要となる。また、処理工程から発生する排
水は、通常のｐＨ調整による有害物質の固形物化除去処
理だけでは除去しきれない砒素やセレン等の有害重金属
が飛灰中に含有されている場合、排水基準を満足できな
くなる。However, when recovering heavy metals as sulfides, unless an alkaline chemical is added with high accuracy, a strong odor due to hydrogen sulfide or the like may occur, and equipment for countermeasures is required. . In addition, in order to refine the recovered sludge, a step of first roasting to obtain an oxide is required. In addition, the wastewater generated from the treatment process satisfies the wastewater standards when fly ash contains harmful heavy metals such as arsenic and selenium that cannot be completely removed by solidification removal of harmful substances by ordinary pH adjustment. become unable.
【０００６】本発明は、溶融飛灰の湿式重金属回収処理
における上記課題を解決するものであって、重金属を回
収する場合に異臭を生ずるおそれがなく、回収したスラ
ジは、精錬するときばい焼して酸化物とする工程が不要
で精錬原料としての品位が高くなり、処理工程から発生
する排水の安全性を向上させることのできる設備費の低
廉な溶融飛灰の重金属回収設備を提供することを目的と
する。The present invention solves the above-mentioned problems in the wet heavy metal recovery processing of molten fly ash, and there is no possibility of generating an odor when recovering heavy metals, and the recovered sludge is roasted during refining. It is an object of the present invention to provide a heavy metal recovery facility for molten fly ash with a low equipment cost, which eliminates the need for a process for converting oxides, increases the quality as a refining raw material, and can improve the safety of wastewater generated from the treatment process. Aim.
【０００７】[0007]
【課題を解決するための手段】本発明の溶融飛灰の重金
属回収設備では、溶融飛灰中の重金属を酸で抽出する酸
抽出槽と、酸抽出槽からの溶液を固液分離する一次固液
分離装置と、一次固液分離装置で分離された重金属含有
溶液中から重金属を水酸化物として沈殿させるアルカリ
反応槽と、アルカリ反応槽からの溶液を固液分離する二
次固液分離装置と、二次固液分離装置で分離された排液
のｐＨ調整による有害物質の固形物化除去処理と中和処
理を行う排水処理装置と、二次固液分離装置で分離され
た重金属含有スラッジを乾燥・ばい焼する乾燥ばい焼装
置とを備えることにより上記課題を解決している。In the heavy metal recovery equipment for molten fly ash of the present invention, an acid extraction tank for extracting heavy metals in the molten fly ash with an acid, and a primary solid phase for solid-liquid separation of the solution from the acid extraction tank. A liquid separation device, an alkali reaction tank that precipitates heavy metals as hydroxide from the heavy metal-containing solution separated by the primary solid-liquid separation device, and a secondary solid-liquid separation device that performs solid-liquid separation of the solution from the alkali reaction tank , A wastewater treatment device that removes and neutralizes harmful substances by adjusting the pH of the wastewater separated by the secondary solid-liquid separator, and a heavy metal-containing sludge separated by the secondary solid-liquid separator. -The above-mentioned problem is solved by providing a dry roasting device for roasting.
【０００８】この溶融飛灰の重金属回収設備では、溶融
処理設備から排出された溶融飛灰を酸抽出槽の酸溶液中
に添加攪拌して、溶融飛灰中の重金属を酸で抽出する。
この酸抽出槽の溶液は一次固液分離装置で固液分離され
て、分離された重金属含有溶液はアルカリ反応槽に送ら
れ、スラッジは溶融処理設備に返送されて再度溶融処理
される。[0008] In this molten fly ash heavy metal recovery facility, the molten fly ash discharged from the melt processing facility is added to the acid solution in the acid extraction tank with stirring, and the heavy metal in the molten fly ash is extracted with an acid.
The solution in the acid extraction tank is subjected to solid-liquid separation by a primary solid-liquid separation device, the separated heavy metal-containing solution is sent to an alkali reaction tank, and the sludge is returned to a melting treatment facility and melted again.
【０００９】アルカリ反応槽では、一次固液分離装置で
分離された重金属含有溶液にアルカリ溶液を添加攪拌し
て、溶液中から重金属を水酸化物として沈殿させる。こ
のアルカリ反応槽の溶液は二次固液分離装置で固液分離
される。In the alkali reaction tank, the alkali solution is added to the heavy metal-containing solution separated by the primary solid-liquid separator and stirred to precipitate heavy metals as hydroxide from the solution. The solution in the alkaline reaction tank is subjected to solid-liquid separation by a secondary solid-liquid separator.
【００１０】二次固液分離装置で分離された排液は、排
水処理装置においてまずｐＨ９〜１０．５に調整するこ
とにより有害物質の固形物化除去処理が行われ、その後
酸溶液を添加して中和処理を行ない基準値を満たす排水
として系外へ放流される。The effluent separated by the secondary solid-liquid separator is subjected to a solidification removal treatment of harmful substances by first adjusting the pH to 9 to 10.5 in a wastewater treatment device, and then adding an acid solution. It is neutralized and discharged out of the system as wastewater that meets the standard value.
【００１１】砒素やセレン等の有害重金属が飛灰中に含
有されている場合、排液は、ｐＨ９〜１０．５に調整す
ることにより通常の有害物質の固形物化除去処理を行っ
た後、ｐＨ５〜６．５に再調整することにより砒素やセ
レン等の有害重金属の固形物化除去処理を行い、アルカ
リ溶液を添加して中和処理し基準値を満たす排水として
系外へ放流される。When harmful heavy metals such as arsenic and selenium are contained in fly ash, the effluent is adjusted to pH 9 to 10.5 to carry out the usual solidification removal processing of harmful substances, and then to pH 5 By re-adjusting to ６6.5, harmful heavy metals such as arsenic and selenium are solidified and removed, and an alkali solution is added for neutralization treatment, and the effluent is discharged out of the system as wastewater satisfying a standard value.
【００１２】排液から除去された固形物は、溶融処理設
備に返送されて再度溶融処理される。二次固液分離装置
で分離されたスラッジは、水洗いされて、重金属の水酸
化物を主成分とする脱水ケーキとなり、乾燥ばい焼装置
１１に供給される。乾燥ばい焼装置１１は脱水ケーキを
乾燥し、ばい焼して重金属の水酸化物を酸化物の精錬材
料とする。[0012] The solid matter removed from the waste liquid is returned to the melting processing facility and is again melted. The sludge separated by the secondary solid-liquid separation device is washed with water to form a dehydrated cake mainly composed of a heavy metal hydroxide, and is supplied to the dry roasting device 11. The drying and roasting apparatus 11 dries the dehydrated cake, and performs roasting to use the heavy metal hydroxide as an oxide refining material.
【００１３】[0013]
【発明の実施の形態】図１は本発明の実施の一形態であ
る溶融飛灰の重金属回収設備の構成図、図２は排水処理
装置の構成図、図３は乾燥ばい焼装置の構成図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a molten fly ash heavy metal recovery facility according to an embodiment of the present invention, FIG. 2 is a block diagram of a wastewater treatment apparatus, and FIG. 3 is a block diagram of a dry roasting apparatus. It is.
【００１４】廃棄物の溶融処理設備１は、廃棄物を溶融
固化処理するための溶融炉２と、この溶融炉２に廃棄物
を供給する廃棄物供給装置３を備えている。廃棄物は溶
融炉２に投入され溶融されてスラグＳとなって出湯され
冷却固化される。The waste melting facility 1 includes a melting furnace 2 for melting and solidifying the waste, and a waste supply device 3 for supplying the waste to the melting furnace 2. The waste is put into the melting furnace 2 and is melted to become slag S, which is discharged and cooled and solidified.
【００１５】溶融炉２の排ガス経路中には、集塵器４が
設けられており、溶融炉２の排ガスは、この集塵器４で
溶融飛灰が捕集され、クリーンエヤーＡとして大気中に
放出される。A dust collector 4 is provided in the flue gas path of the melting furnace 2, and the flue gas of the melting furnace 2 is collected by the dust collector 4 to collect molten fly ash, and is used as a clean air A in the atmosphere. Will be released.
【００１６】溶融飛灰の重金属回収設備５は、酸抽出槽
６と、一次固液分離装置７と、アルカリ反応槽８と、二
次固液分離装置９と、排水処理装置１０と、乾燥ばい焼
装置１１とを備えている。The molten fly ash heavy metal recovery equipment 5 includes an acid extraction tank 6, a primary solid-liquid separation device 7, an alkali reaction tank 8, a secondary solid-liquid separation device 9, a wastewater treatment device 10, a drying soybean A baking device 11 is provided.
【００１７】酸抽出槽６には、硫酸タンク１３から硫酸
が供給されており、溶融処理設備１の溶融炉２から排出
され集塵器４で捕集された溶融飛灰が飛灰定量供給装置
１２によって酸抽出槽６の硫酸溶液中に添加され攪拌さ
れて、溶融飛灰中に含有されているＺｎ、Ｃｕ、Ｐｂ等
の重金属が硫酸で抽出される。The acid extraction tank 6 is supplied with sulfuric acid from a sulfuric acid tank 13, and the molten fly ash discharged from the melting furnace 2 of the melting processing facility 1 and collected by the dust collector 4 is supplied to the fly ash quantitative supply device. The mixture is added to the sulfuric acid solution in the acid extraction tank 6 and stirred by means of 12, and heavy metals such as Zn, Cu, and Pb contained in the molten fly ash are extracted with sulfuric acid.
【００１８】一次固液分離装置７としてはフィルタープ
レスが用いられており、酸抽出槽６の溶液が一次固液分
離装置７で固液分離されて、分離された重金属含有溶液
はアルカリ反応槽８に送られる。脱水分離されたスラッ
ジは、ＳｉＯ2 やＡｌ2 Ｏ3を主成分とするケーキであ
り、溶融処理設備１に返送されて溶融炉２で再度溶融処
理される。A filter press is used as the primary solid-liquid separator 7, and the solution in the acid extraction tank 6 is subjected to solid-liquid separation in the primary solid-liquid separator 7, and the separated heavy metal-containing solution is transferred to the alkali reaction tank 8. Sent to The dewatered and separated sludge is a cake containing SiO 2 or Al 2 O 3 as a main component, and is returned to the melt processing facility 1 and melted again in the melting furnace 2.
【００１９】アルカリ反応槽８では、一次固液分離装置
７で分離された重金属含有溶液に苛性ソーダタンク１４
から苛性ソーダがｐＨ１０となるまで添加され攪拌され
て、溶液中から重金属をＺｎ（ＯＨ）2 、Ｃｕ（ＯＨ）
2 、Ｐｂ（ＯＨ）2 等の水酸化物として沈殿させる。In the alkaline reaction tank 8, the caustic soda tank 14 is added to the heavy metal-containing solution separated by the primary solid-liquid separation device 7.
Caustic soda is added to the solution until the pH becomes 10 and stirred to remove heavy metals from the solution to Zn (OH) 2 and Cu (OH).
2. Precipitate as hydroxide such as Pb (OH) 2 .
【００２０】二次固液分離装置９にもフィルタープレス
が用いられている。二次固液分離装置９ではアルカリ反
応槽８の溶液が固液分離される。二次固液分離装置９で
分離された排液は、排水処理装置１０の処理槽１６Ａに
おいて、まずｐＨ計１５でモニターしながら必要に応じ
て硫酸または苛性ソーダを添加してｐＨ９〜１０．５に
調整し、共沈剤添加装置１９から共沈剤を添加すること
により有害物質の固形物化処理を行い、凝集沈殿槽１７
Ａで固形物を除去し、その後中和槽１８で硫酸溶液を添
加してｐＨ７となるよう中和処理を行ない、基準値を満
たす排水Ｗとして系外へ放流される。A filter press is also used in the secondary solid-liquid separation device 9. In the secondary solid-liquid separation device 9, the solution in the alkali reaction tank 8 is subjected to solid-liquid separation. The effluent separated by the secondary solid-liquid separator 9 is adjusted to pH 9-10.5 by adding sulfuric acid or caustic soda as needed while monitoring with a pH meter 15 in the treatment tank 16A of the wastewater treatment device 10. The coagulating sedimentation tank 17 is adjusted by adding the coprecipitating agent from the coprecipitating agent adding device 19 to solidify the harmful substance.
The solid matter is removed by A, and then a sulfuric acid solution is added in a neutralization tank 18 to perform a neutralization treatment so as to have a pH of 7, and discharged out of the system as wastewater W satisfying a standard value.
【００２１】砒素やセレン等の有害重金属が飛灰中に含
有されている場合には、排液は、ｐＨ９〜１０．５に調
整することによる通常の有害物質の固形物化除去処理を
行った後、処理槽１６Ｂにおいて、ｐＨ計１５でモニタ
ーしながら必要に応じて硫酸または苛性ソーダを添加し
てｐＨ５〜６．５に再調整し、共沈剤添加装置１９から
共沈剤を添加して砒素やセレン等の有害重金属を共沈さ
せることにより固形物化除去処理を行って凝集沈殿槽１
７Ｂで固形物を除去してから、中和槽１８で苛性ソーダ
溶液を添加して中和処理し、基準値を満たす排水Ｗとし
て系外へ放流される。When harmful heavy metals such as arsenic and selenium are contained in fly ash, the effluent is subjected to the usual solidification removal treatment of harmful substances by adjusting the pH to 9 to 10.5. In the treatment tank 16B, while monitoring with the pH meter 15, sulfuric acid or caustic soda is added as necessary to adjust the pH to 5-6.5, and a coprecipitant is added from the coprecipitant adding device 19 to add arsenic or arsenic. Coagulation sedimentation tank 1 by performing solidification removal treatment by coprecipitating harmful heavy metals such as selenium
After the solid matter is removed in 7B, the solution is neutralized by adding a caustic soda solution in the neutralization tank 18 and discharged out of the system as wastewater W satisfying the standard value.
【００２２】凝集沈殿槽１７Ａ、１７Ｂで排液から除去
された固形物は、溶融処理設備１に返送されて溶融炉２
で再度溶融処理される。二次固液分離装置９で分離され
たスラッジは、水洗いされて、Ｚｎ（ＯＨ）2、Ｃｕ
（ＯＨ）2 、Ｐｂ（ＯＨ）2 等の重金属の水酸化物を主
成分とする脱水ケーキとなる。The solid matter removed from the effluent in the coagulating sedimentation tanks 17A and 17B is returned to the melting treatment equipment 1 and is returned to the melting furnace 2.
Is melted again. The sludge separated by the secondary solid-liquid separation device 9 is washed with water, and then Zn (OH) 2 , Cu
(OH) 2, the dehydrated cake composed mainly of Pb (OH) 2, such as heavy metal hydroxides.
【００２３】この脱水ケーキは、ケーキ定量供給機２０
によって乾燥ばい焼装置１１に供給される。乾燥ばい焼
装置１１にはロータリーキルン等が用いられ、この乾燥
ばい焼装置１１には、熱風が送られて脱水ケーキを乾燥
し、ばい焼して重金属の水酸化物を酸化物とし、精錬材
料Ｍとしてホッパー２１に貯留する。なお、この熱風の
熱源には、溶融炉２の排熱を利用できるので省エネルギ
ーが可能となる。This dehydrated cake is supplied to a cake metering machine 20
Is supplied to the dry roasting apparatus 11. A rotary kiln or the like is used for the drying and roasting apparatus 11. Hot air is sent to the drying and roasting apparatus 11 to dry the dewatered cake, and the dehydrated cake is roasted to turn heavy metal hydroxides into oxides. And stored in the hopper 21. In addition, since the exhaust heat of the melting furnace 2 can be used as the heat source of the hot air, energy can be saved.
【００２４】乾燥ばい焼装置１１の排ガスは集塵器２２
でダストが除去され、クリーンエヤーとして大気中に放
出される。集塵器２２で捕集されたダストは精錬材料Ｍ
としてホッパー２１に貯留する。The exhaust gas from the drying and roasting apparatus 11 is supplied to a dust collector 22.
Dust is removed in the air and released to the atmosphere as clean air. The dust collected by the dust collector 22 is the refining material M
And stored in the hopper 21.
【００２５】この溶融飛灰の湿式重金属回収処理は、重
金属を苛性ソーダにより水酸化物として沈殿させるの
で、重金属を回収する場合に異臭を生ずるおそれがな
く、回収したスラジは、乾燥ばい焼して重金属の酸化物
としているので、精錬するときばい焼して酸化物とする
工程が不要であり精錬原料としての品位が高くなる。In the wet heavy metal recovery treatment of the molten fly ash, since heavy metals are precipitated as hydroxides with caustic soda, there is no danger of generating a bad smell when recovering heavy metals. Therefore, a step of roasting to an oxide during refining is not required, and the quality as a refining raw material is increased.
【００２６】また、通常のｐＨ調整だけでは除去できな
い砒素やセレン等の特定重金属が含有されている場合も
これを共沈させて除去できるので、処理工程から発生す
る排水の安全性を向上させることができる。Further, even when a specific heavy metal such as arsenic or selenium which cannot be removed by ordinary pH adjustment alone is contained, it can be removed by co-precipitation, thereby improving the safety of wastewater generated from the treatment process. Can be.
【００２７】なお、重金属を一括して回収するので設備
費も低減することができる。Since heavy metals are collectively collected, equipment costs can be reduced.
【００２８】[0028]
【発明の効果】以上説明したように、本発明の溶融飛灰
の重金属回収設備は、溶融飛灰から重金属を回収する場
合に重金属を水酸化物として沈殿させるので異臭を生ず
るおそれがなく、回収したスラジは、精錬するときばい
焼して酸化物とする工程が不要で精錬原料としての品位
が高くなる。また、処理工程から発生する排水の安全性
を向上させることができる。As described above, the heavy metal recovery equipment for molten fly ash according to the present invention, when recovering heavy metal from molten fly ash, precipitates heavy metal as hydroxide, so that there is no danger of generating an unpleasant odor. The sludge thus refined does not require a step of roasting into oxide when refining, and the grade as a refining raw material is high. Further, the safety of wastewater generated from the treatment process can be improved.
【図１】本発明の実施の一形態である溶融飛灰の重金属
回収設備の構成図である。FIG. 1 is a configuration diagram of a molten fly ash heavy metal recovery facility according to an embodiment of the present invention.
【図２】排水処理装置の構成図である。FIG. 2 is a configuration diagram of a wastewater treatment device.
【図３】乾燥ばい焼装置の構成図である。FIG. 3 is a configuration diagram of a dry roasting apparatus.
１ 溶融処理設備 ２ 溶融炉 ３ 廃棄物供給装置 ４ 集塵器 ５ 溶融飛灰の重金属回収設備 ６ 酸抽出槽 ７ 一次固液分離装置 ８ アルカリ反応槽 ９ 二次固液分離装置 １０ 排水処理装置 １１ 乾燥ばい焼装置 １２ 飛灰定量供給装置 １３ 硫酸タンク １４ 苛性ソーダタンク １５ ｐＨ計 １６Ａ 処理槽 １６Ｂ 処理槽 １７Ａ 凝集沈殿槽 １７Ｂ 凝集沈殿槽 １８ 中和槽 １９ 共沈剤添加装置 ２０ ケーキ定量供給機 ２１ ホッパー ２２ 集塵器 Ａ クリーンエヤー Ｍ 精錬材料 Ｓ スラグ Ｗ 排水 DESCRIPTION OF SYMBOLS 1 Melting processing equipment 2 Melting furnace 3 Waste supply device 4 Dust collector 5 Heavy metal recovery equipment of molten fly ash 6 Acid extraction tank 7 Primary solid-liquid separation device 8 Alkaline reaction tank 9 Secondary solid-liquid separation device 10 Wastewater treatment device 11 Dry roasting apparatus 12 Fly ash quantitative supply apparatus 13 Sulfuric acid tank 14 Caustic soda tank 15 pH meter 16A Processing tank 16B Processing tank 17A Coagulation sedimentation tank 17B Coagulation sedimentation tank 18 Neutralization tank 19 Coprecipitating agent addition apparatus 20 Cake quantitative supply machine 21 Hopper 22 Dust collector A Clean air M Refining material S Slag W Drainage
Claims (1)
出槽と、酸抽出槽からの溶液を固液分離する一次固液分
離装置と、一次固液分離装置で分離された重金属含有溶
液中から重金属を水酸化物として沈殿させるアルカリ反
応槽と、アルカリ反応槽からの溶液を固液分離する二次
固液分離装置と、二次固液分離装置で分離された排液の
ｐＨ調整による有害物質の固形物化除去処理と中和処理
を行う排水処理装置と、二次固液分離装置で分離された
重金属含有スラッジを乾燥・ばい焼する乾燥ばい焼装置
とを備えた溶融飛灰の重金属回収設備。1. An acid extraction tank for extracting heavy metals in molten fly ash with an acid, a primary solid-liquid separation device for solid-liquid separation of a solution from the acid extraction tank, and a heavy metal-containing material separated by the primary solid-liquid separation device. An alkali reaction tank that precipitates heavy metals as hydroxide from the solution, a secondary solid-liquid separation device that separates the solution from the alkali reaction tank into solid and liquid, and a pH adjustment of the wastewater separated by the secondary solid-liquid separation device Wastewater treatment equipment that performs solidification removal treatment and neutralization treatment of harmful substances by effluent, and a dry roasting device that dries and roasts heavy metal-containing sludge separated by a secondary solid-liquid separator. Heavy metal recovery equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29718497A JPH11128873A (en) | 1997-10-29 | 1997-10-29 | Heavy metal recovering device for molten fly ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29718497A JPH11128873A (en) | 1997-10-29 | 1997-10-29 | Heavy metal recovering device for molten fly ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11128873A true JPH11128873A (en) | 1999-05-18 |
Family
ID=17843269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29718497A Pending JPH11128873A (en) | 1997-10-29 | 1997-10-29 | Heavy metal recovering device for molten fly ash |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11128873A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010110611A (en) * | 2000-06-07 | 2001-12-13 | 임수선 | Collection equipment of the precious component |
| JP2006102559A (en) * | 2004-09-30 | 2006-04-20 | Dowa Mining Co Ltd | Treatment method of selenium-containing wastewater |
| JP2009297640A (en) * | 2008-06-12 | 2009-12-24 | Ohbayashi Corp | Method and system for treating boron-containing incineration ash |
| JP2011147882A (en) * | 2010-01-21 | 2011-08-04 | Taiheiyo Cement Corp | Method and system for treatment of fine powder containing calcium component and lead component |
-
1997
- 1997-10-29 JP JP29718497A patent/JPH11128873A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010110611A (en) * | 2000-06-07 | 2001-12-13 | 임수선 | Collection equipment of the precious component |
| JP2006102559A (en) * | 2004-09-30 | 2006-04-20 | Dowa Mining Co Ltd | Treatment method of selenium-containing wastewater |
| JP2009297640A (en) * | 2008-06-12 | 2009-12-24 | Ohbayashi Corp | Method and system for treating boron-containing incineration ash |
| JP2011147882A (en) * | 2010-01-21 | 2011-08-04 | Taiheiyo Cement Corp | Method and system for treatment of fine powder containing calcium component and lead component |
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