KR20010076210A - Method for withdrawing phosphorus from sewage sludge or burned ash thereof - Google Patents
Method for withdrawing phosphorus from sewage sludge or burned ash thereof Download PDFInfo
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- KR20010076210A KR20010076210A KR1020000057388A KR20000057388A KR20010076210A KR 20010076210 A KR20010076210 A KR 20010076210A KR 1020000057388 A KR1020000057388 A KR 1020000057388A KR 20000057388 A KR20000057388 A KR 20000057388A KR 20010076210 A KR20010076210 A KR 20010076210A
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- South Korea
- Prior art keywords
- phosphorus
- sewage sludge
- sewage
- iron
- incineration
- Prior art date
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 44
- 239000011574 phosphorus Substances 0.000 title claims abstract description 44
- 239000010801 sewage sludge Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000002844 melting Methods 0.000 claims abstract description 35
- 230000008018 melting Effects 0.000 claims abstract description 35
- 229910052742 iron Inorganic materials 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 230000005484 gravity Effects 0.000 claims abstract description 10
- 150000002506 iron compounds Chemical class 0.000 claims abstract description 6
- 239000010865 sewage Substances 0.000 claims description 58
- 239000002699 waste material Substances 0.000 claims description 47
- 239000000155 melt Substances 0.000 claims description 23
- 239000002994 raw material Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 19
- 239000000571 coke Substances 0.000 claims description 10
- 239000003575 carbonaceous material Substances 0.000 claims description 4
- 101100002917 Caenorhabditis elegans ash-2 gene Proteins 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 239000012768 molten material Substances 0.000 abstract 1
- 239000002956 ash Substances 0.000 description 30
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 20
- 239000000292 calcium oxide Substances 0.000 description 12
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 235000012255 calcium oxide Nutrition 0.000 description 8
- 239000010459 dolomite Substances 0.000 description 7
- 229910000514 dolomite Inorganic materials 0.000 description 7
- 238000004056 waste incineration Methods 0.000 description 6
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 5
- VAKIVKMUBMZANL-UHFFFAOYSA-N iron phosphide Chemical compound P.[Fe].[Fe].[Fe] VAKIVKMUBMZANL-UHFFFAOYSA-N 0.000 description 5
- 239000000395 magnesium oxide Substances 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910000398 iron phosphate Inorganic materials 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- -1 mill scale Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2200/00—Waste incineration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/20—Dewatering by mechanical means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Gasification And Melting Of Waste (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
본 발명은 하수 찌꺼기 내지는 하수 찌꺼기의 소각재에서 인을 회수하는 방법에 관한 것이다.The present invention relates to a method for recovering phosphorus from the incineration ash of sewage sludge or sewage sludge.
하수 처리에 의해 발생되는 찌꺼기는 하수도의 보급에 따라 증가되고 있으나 주된 처리지였던 매립지가 감소됨에 따라 최근에는 이전에 비해 매립처분하기 어려워지고 있다. 이에, 찌꺼기의 처분량을 저감시키기 위해 하수 찌꺼기의 용량 및용적의 감소가 절실히 요구되고 있다.Waste generated by sewage treatment is increasing with the spread of sewage, but as landfills, which are the main treatment sites, have been reduced, it has become more difficult to dispose of landfills than before. Therefore, in order to reduce the amount of waste disposal, there is an urgent need to reduce the capacity and volume of the sewage waste.
또한, 용량 및 용적의 감소에 그치지 않고 하수 찌꺼기 또는 하수 찌꺼기의 소각재를 유효하게 이용하기 위하여 자원화 기술의 확립이 요망되고 있으며, 자원화 기술의 하나로서 가령 하수 찌꺼기 또는 하수 찌꺼기의 소각재를 고온으로 용융하여 콘크리트에 이용되는 골재로 제조하고 있다.In addition, in order to effectively use incineration materials of sewage residues or sewage residues, not only decreases in capacity and volume, it is desired to establish a recycling technology. Manufactured from aggregate used in concrete.
그러나, 하수 찌꺼기나 하수 찌꺼기의 소각재에는 인이 포함되어 있는데 종래의 자원화 기술로는 하수 찌꺼기의 소각재에서 인을 회수할 수 없어 자원을 충분히 활용할 수 없다.However, the incineration ash of sewage waste and sewage waste contains phosphorus. However, the conventional resource-recycling technology cannot recover phosphorus from the waste ash incineration, and thus cannot fully utilize the resources.
본 발명은 이러한 실정을 감안하여 이루어진 것으로서, 하수 찌꺼기 또는 하수 찌꺼기의 소각재에서 인을 회수하도록 하여 하수 찌꺼기 또는 하수 찌꺼기의 소각재를 효과적으로 이용함으로써, 자원의 활용을 가능케 하는 것을 목적으로 한다.The present invention has been made in view of the above circumstances, and an object of the present invention is to enable the utilization of resources by effectively using the incineration ash of sewage waste or sewage waste by recovering phosphorus from the incineration ash of sewage waste or sewage waste.
도 1은 본 발명의 방법을 실시하기 위한 장치의 일 예를 나타낸 개략적인 도면.1 is a schematic diagram illustrating an example of an apparatus for practicing the method of the present invention.
*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
2 : 하수 찌꺼기의 소각재(하수 찌꺼기 또는 하수 찌꺼기의 소각재)2: incineration ash of sewage waste (sewage waste or incineration ash of sewage waste)
10 : 밀 스케일(철 또는 철 화합물)10: mill scale (iron or iron compound)
15 : 전기 용융로15: electric melting furnace
20 : 용융 금속20: molten metal
본 발명에 따른 인의 회수 방법은, 인이 포함된 하수 찌꺼기 또는 하수 찌꺼기의 소각재와 철 혹은 철화합물을 전기 용융로내에서 용융하여 용융물을 생성하고, 이 용융물에 포함된 물질을 그 물질의 비중차에 따라 분리시켜 철에 인이 포함된 용융금속을 생성하는 것이다.In the method for recovering phosphorus according to the present invention, incineration of sewage residues or sewage residues containing phosphorus and iron or iron compounds are melted in an electric melting furnace to produce a melt, and the material contained in the melt is converted into a specific gravity difference of the substance. Separation is to produce a molten metal containing phosphorus in iron.
또한, 본 발명에 따른 인의 회수방법은, 인이 포함된 하수 찌꺼기 또는 하수 찌꺼기의 소각재를 전기 용융로에서 용융하여 용융물을 형성하고, 상기 용융물에 철 또는 철 화합물을 첨가하여 용융물에 포함된 물질을 비중차에 따라 분리시켜 철에 인이 포함된 용융금속을 생성하는 것이다.In addition, in the method for recovering phosphorus according to the present invention, the incineration ash of sewage sludge or sewage sludge containing phosphorus is melted in an electric melting furnace to form a melt, and the iron or iron compound is added to the melt to gravity the material contained in the melt. Separation according to the difference produces molten metal containing phosphorus in iron.
본 발명에 따르면, 하수 찌꺼기 또는 하수 찌꺼기의 소각재로부터, 광물 자원으로서 중요한 인을 인화철로서 회수할 수 있기 때문에, 하수 찌꺼기 또는 하수 찌꺼기의 소각재의 유효한 활용을 기대할 수 있으며, 이로써 자원의 활용을 꾀할 수 있다.According to the present invention, since it is possible to recover phosphorus, which is important as a mineral resource, from iron incineration ash of sewage waste or sewage waste as iron phosphide, it is possible to expect effective utilization of incineration ash or sewage waste incineration. Can be.
더욱이, 본 발명에서는 전기 용융로에서 인이 포함된 하수 찌꺼기 또는 하수 찌꺼기의 소각재를 환원 분위기에서 용융시키는 것이 바람직하다.Furthermore, in the present invention, it is preferable to melt the incineration material of the sewage waste or sewage waste containing phosphorus in an electric melting furnace in a reducing atmosphere.
이와 같이 인이 포함된 하수 찌꺼기 또는 하수 찌꺼기의 소각재를 환원 분위기에서 용융시키면, 용융물내의 철분이 금속철로 변환되도록 촉진되고, 인산이 인단량체로 환원되도록 촉진되므로 조업의 효율화를 꾀할 수 있다.As such, when the incineration material of the sewage waste or sewage waste containing phosphorus is melted in a reducing atmosphere, the iron in the melt is promoted to be converted into metal iron, and phosphoric acid is promoted to be reduced to the phosphorus monomer, thereby improving efficiency of operation.
용융로 내부를 환원 분위기로 하려면, 원료로서 코크스를 이용하는 방법, 탄소 물질을 이용하는 방법, 로 내부로 공기가 유입되는 것을 극력히 억제하는 방법중 적어도 어느 한 방법을 취하는데, 이 때에도 상기한 바와 같이 조업의 효율화를 꾀할 수 있다.In order to make the inside of a melting furnace into a reducing atmosphere, at least one of a method of using coke as a raw material, a method of using a carbon material, and a method of suppressing the inflow of air into the furnace extremely, may be used. Efficiency can be achieved.
이하, 본 발명의 실시형태를 도시예와 함께 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with an illustration example.
도 1은 본 발명의 방법을 실시하기 위한 장치의 일례를 나타내며, 도면 부호 1은 하수 찌꺼기를 도시가 생략된 소각로에 의해 소각함으로써 생성된 하수 찌꺼기의 소각재(2)를 수납하기 위한 하수 찌꺼기 소각재 호퍼, 3, 4, 5, 6은 부원료 호퍼, 7은 원료공급 컨베이어이다. 그리고 가령, 부원료 호퍼(3)에는 백운석(MgO＋CaO ; 8)을, 부원료 호퍼(4)에는 생석회(CaO ; 9)를, 부원료 호퍼(5)에는 밀스케일(FeO ; 10)을, 부원료 호퍼(6)에는 코크스(C ; 11)를 각각 부원료로서 수납할 수 있도록 되어 있다.1 shows an example of an apparatus for carrying out the method of the present invention, in which reference numeral 1 denotes a sewage waste incineration hopper for accommodating the incineration ashes 2 of sewage waste produced by incineration by incinerators not shown. , 3, 4, 5, and 6 are side feed hoppers, and 7 is a raw material supply conveyor. For example, dolomite (MgO + CaO; 8) is added to the sub-material hopper 3, quicklime (CaO; 9) is applied to the sub-material hopper 4, mill scale (FeO; 10) to the sub-material hopper 5, and the sub-material hopper 6 is used. ), The coke C 11 can be accommodated as a subsidiary material, respectively.
도면부호 12는 하수 찌꺼기 소각재 호퍼(1) 및 부원료 호퍼(3, 4, 5, 6)로부터 배출되어 원료 공급 컨케이어(7)로부터 반송되어 온 하수 찌꺼기의 소각재(2), 백운석(8), 생석회(9), 밀스케일(10), 코크스(11)를 각각 원료(13)로서 반송하는 원료 공급 컨케이어이고, 도면부호 14는 원료공급 컨베이어(12)의 상부 수평부 하방에 배치된 복수의 원료 공급 장치, 15는 원료 공급 장치(14)에서 투입된 원료(13)를 용융하기 위한 전기 용융로이다.Reference numeral 12 denotes the incineration ash (2) and the dolomite (8) of the sewage waste discharged from the sewage waste incineration hopper (1) and the subsidiary hoppers (3, 4, 5, 6) and returned from the raw material supply conveyor (7). , The quicklime 9, the mill scale 10, and the coke 11 are each a raw material supply conveyor for conveying them as the raw material 13, and reference numeral 14 denotes a plurality of materials disposed below the upper horizontal portion of the raw material supply conveyor 12. 15 is an electric melting furnace for melting the raw material 13 injected from the raw material supply device 14.
전기 용융로(15)는 직류식 전기 저항로로서, 로 내부의 중심부에는 음극이 되는 탄소제의 전극(16)이 설치되고, 로 바닥부의 벽돌 내부에 양극이 되는 철판제의 전극(17)이 매립되며, 전극(16, 17)간에 전류를 통과시켜 줄열을 발생시킴으로써 하수 찌꺼기의 소각재(2)등의 원료(13)를 용융할 수 있도록 되어 있다.The electric melting furnace 15 is a direct current electric resistance furnace, and a carbon electrode 16 serving as a cathode is provided at the center of the furnace, and an iron plate electrode 17 serving as an anode is embedded in the brick at the bottom of the furnace. The raw material 13 such as the incineration ash 2 of the sewage waste can be melted by passing a current between the electrodes 16 and 17 to generate Joule heat.
또한, 도면부호 18은 하수 찌꺼기 소각재(2)등이 전기 용융로(15)내부에서 용융됨으로써 생성된 용융물에 포함되며, 전기 용융로(15)의 바닥부보다 상방에 위치하도록 설치된 배출구(19)로부터 배출되는 용융 슬래그이고, 20은 상기 용융물에 포함되며 일정 시간 간격으로 전기 용융로(15)의 바닥부에서 용기(21)로 배출되는 용융금속이며, 22는 전기 용융로(15) 상부에 설치된 상부 배출구(23)로부터 전기 용융로(15)의 외부로 배출되는 가스이다.In addition, reference numeral 18 is included in the melt produced by the sewage waste incineration ash 2 and the like melted in the electric melting furnace 15, and discharged from the discharge port 19 installed to be located above the bottom of the electric melting furnace 15. 20 is a molten slag which is included in the melt and is discharged from the bottom of the electric melting furnace 15 to the container 21 at regular time intervals, and 22 is an upper outlet 23 installed above the electric melting furnace 15. ) Is a gas discharged to the outside of the electric melting furnace 15.
다음으로 상기 도시예의 동작에 관하여 설명한다.Next, the operation of the illustrated example will be described.
하수 찌꺼기 소각재 호퍼(1)로부터 배출된 하수 찌꺼기의 소각재(2), 각 부원료 호퍼(3, 4, 5, 6)로부터 배출된 백운석(8), 생석회(9), 밀스케일(10), 코크스(11)는, 원료(13)로서 원료공급 컨베이어(7)를 통해 반송되어 원료공급 컨베이어(12)로 공급되고, 원료공급 컨베이어(12)를 통해 상부로 반송되어 상부 수평부에서 하방의 원료 공급 장치(14)로 공급되며, 원료 공급장치(14)로부터 전기 용융로(15)내부로 투입된다.Sewage waste incineration ash (2) from sewage waste incineration hopper (1), dolomite (8), quicklime (9), mill scale (10), coke discharged from each subsidiary hopper (3, 4, 5, 6) 11 is conveyed as the raw material 13 through the raw material supply conveyor 7, and is supplied to the raw material supply conveyor 12, and conveyed to the upper part through the raw material supply conveyor 12, and supplies raw material below from the upper horizontal part. It is supplied to the apparatus 14, and it is introduced into the electric melting furnace 15 from the raw material supply apparatus 14.
백운석(8), 생석회(9), 밀스케일(10), 코크스(11)는 전기 용융로(15)내부에서 하수 찌꺼기의 소각재(2)가 용융되기 시작한 후 전기 용융로(15)에 첨가되도록 하여도 되고, 혹은 하수 찌꺼기의 소각재(2)와 함께 전기 용융로(15)에 투입되도록 하여도 된다.Dolomite (8), quicklime (9), mill scale (10), coke (11) may be added to the electric melting furnace (15) after the incineration ash (2) of the sewage waste begins to melt in the electric melting furnace (15). Or it may be made to inject | pour into the electric melting furnace 15 with the incineration material 2 of sewage waste.
전기 용융로(15)내부로 투입된 하수 찌꺼기의 소각재(2)등의 원료(13)는, 환원분위기하에서 줄열에 의해 1300℃∼1600℃정도로 가열되어 용융된다. 이와 같이 원료(13)가 용융되어 생성된 전기 용융로(15)내부의 용융물에 포함된 물질은, 비중차에 따라 분리되어 돌이 주성분인 비교적 비중이 가벼운 산화 칼슘, 이산화 규소, 산화 알루미늄, 산화 마그네슘은 용융물의 상층으로 이행하고, 비중이 높은 철 등의 중금속은 융융물의 하층으로 침강한다. 또, 비점이 낮은 물질은 기화되어 가스(22)로서 상부 배출구(23)를 통해 전기 용융로(15) 외부로 배출된다.The raw materials 13, such as the incineration ashes 2 of the sewage waste introduced into the electric melting furnace 15, are heated and melted to about 1300 ° C to 1600 ° C by Joule heat under a reducing atmosphere. Thus, the material contained in the melt in the electric melting furnace 15 generated by melting the raw material 13 is separated according to the specific gravity difference, and the relatively low specific gravity calcium oxide, silicon dioxide, aluminum oxide, and magnesium oxide, whose main components are stones, Transition to the upper layer of the melt, heavy metals such as iron with high specific gravity settle to the lower layer of the melt. In addition, the substance having a low boiling point is vaporized and discharged out of the electric melting furnace 15 through the upper outlet 23 as the gas 22.
인은 전기 용융로(15)내부에서 환원되어 단량체가 되며, 이어서 철과 화합하여 인화철이 되어 용융액의 하층으로 침강하기 때문에, 부원료로서 밀스케일(10)과 같은 철분을 첨가하면 인을 하층으로 용이하게 분리시킬 수 있게 된다.Phosphorus is reduced in the electric melting furnace 15 to become a monomer, and then compounded with iron to form iron phosphide to settle to the lower layer of the melt, so adding iron powder such as mill scale 10 as a subsidiary material facilitates phosphorus to the lower layer. Can be separated.
용융물중 비중이 가벼운 상층의 용융물은, 용융 슬래그(18)로서 배출구(19)를 통해 연속적으로 배출되며, 후공정에서 소정의 처리에 의해 고체화되어 천연석과 동일한 정도의 돌이 형성된다.The melt of the upper layer having a light specific gravity in the melt is continuously discharged through the discharge port 19 as the molten slag 18, and is solidified by a predetermined treatment in a later step to form stones of the same level as natural stone.
하층으로 이행한 비중이 높은 용융물은, 전기 용융로(15)의 바닥에 형성된 구멍에 충전되어 있는 내화물을 제거함으로써, 전기 용융로(15)로부터 용융금속(20)으로서 일정시간 간격으로 추출되어 용기(21)에 저류되는 등의 처리에 의해 후공정에서 냉각되고 고체화되어 인화철이 형성된다.The melt having a high specific gravity transferred to the lower layer is extracted from the electric melting furnace 15 at a predetermined time interval as the molten metal 20 by removing the refractory filled in the hole formed in the bottom of the electric melting furnace 15, and the container 21 ) Is cooled and solidified in a subsequent step by a process such as storage in iron) to form iron phosphide.
전기 용융로(15)에서 하수 찌꺼기의 소각재(2)등의 각종 원료(13)가 용융되어 인화철이 형성될 때에는 전기 용융로(15)내에서는 가령, [화학식 1], [화학식 2], [화학식 3], [화학식 4], [화학식 5]와 같은 반응이 이루어진다.When various raw materials 13 such as incineration ashes 2 of sewage waste are melted in the electric melting furnace 15 and iron phosphide is formed, the electric melting furnace 15 is, for example, [Formula 1], [Formula 2], [Formula 3] ], [Formula 4], [Formula 5] and the reaction is made.
본 발명의 실시형태예에 따르면, 하수 찌꺼기의 소각재(2)로부터 광물 자원으로서 중요한 인을 산화철로서 회수할 수 있기 때문에, 하수 찌꺼기의 소각재(2)를 유효하게 이용할 수 있게 되어 자원의 충분한 활용을 도모할 수 있다.According to the embodiment of the present invention, since phosphorus which is important as a mineral resource can be recovered as iron oxide from the incineration ashes 2 of sewage waste, the incineration ashes 2 of sewage wastes can be effectively used, so that sufficient utilization of the resources can be achieved. We can plan.
본원의 발명자들은 인의 회수와, 인, 철, 중금속류의 분리상황을 확인하기 위하여 기초실험을 실시하였다. 즉, 직류식 전기 저항로에 하수 찌꺼기의 소각재, 백운석, 생석회, 밀스케일, 코크스를 투입하고 환원 분위기하에서 용융하여 추출된 용융 금속들의 성분을 조사하였다. 인과 철을 확실히 결합하기 위하여, 직류식 전기 저항로에 첨가되는 철분의 양을 화학적으로 필요한 양의 약 2배로 늘렸다. 그 결과, 용융 금속내의 회수가능한 인은 약 92%, 용융 슬래그내의 돌의 성분으로서 남은 인은 약 5%, 배기가스로서 로의 외부로 배출된 인은 약 3%로서 매우 양호한 결과가 얻어졌다. 용융금속의 성분은 철이 약 78%, 인이 약 15%였다.The inventors of the present application conducted a basic experiment to confirm the recovery of phosphorus and the separation of phosphorus, iron, heavy metals. In other words, incineration ash, dolomite, quicklime, mill scale and coke of sewage waste were injected into a DC electric resistance furnace, and the components of the molten metals extracted by melting in a reducing atmosphere were investigated. In order to ensure that the phosphorus and iron are combined, the amount of iron added to the direct current resistance furnace was increased to about twice the amount required chemically. As a result, very good results were obtained: about 92% of the recoverable phosphorus in the molten metal, about 5% of the phosphorus remaining as a stone component in the molten slag, and about 3% of the phosphorus discharged to the outside of the furnace as exhaust gas. The molten metal contained about 78% iron and about 15% phosphorus.
실험에는 [표 1]에 도시된 성분 및 함유량의 하수 찌꺼기의 소각재를 사용하고, 하수 찌꺼기의 소각재에 대한 백운석, 생석회, 밀스케일, 코크스의 비율은 [표 2]에 나타낸 바와 같다. 또한, 용융물에서 생성된 생성물의 양은 [표 3]과 같고, 인화철 성분의 함유량은 [표 4]에 나타낸 바와 같다.In the experiment, incineration ash of sewage wastes having the components and contents shown in [Table 1] was used, and the ratio of dolomite, quicklime, mill scale, and coke to the incineration ash of sewage residues is shown in [Table 2]. In addition, the quantity of the product produced | generated in the melt is as Table 3, and content of an iron phosphate component is as Table 4 shows.
하수 찌꺼기 또는 하수 찌꺼기의 소각재를 용융시킨 용융물에서 추출된 인철을 제품으로서 판매하려면, 하수 찌꺼기 또는 하수 찌꺼기의 소각재의 인의 함유량이 20wt%이상인 것이 바람직하나, 설사 인의 함유량이 적은 경우에도 철의 첨가량 등을 적절히 조정함으로서 실현가능할 것이라 생각된다.In order to sell phosphorus extracted from the melt in which the incineration ash of sewage waste or sewage waste is melted as a product, it is preferable that the phosphorus content of the incineration ash of sewage waste or sewage waste is 20 wt% or more. It is thought to be feasible by appropriately adjusting.
본 발명의 실시형태에서는 주원료로서 하수 찌꺼기의 소각재를 사용하는 경우에 대하여 설명하였으나, 소각되지 않은 하수 찌꺼기 자체를 사용할 수도 있고 전기 용융로 내부를 환원성 분위기로 하려면, 본 발명의 실시형태예와 같이, 부원료로 코크스를 이용하거나 탄소물질을 이용하거나 로 내부에 공기가 유입되는 것을 극력히 억제하도록 하여도 실시 가능하다는 점, 전극으로서 탄소성 전극을 이용하면 전극의 내구성을 향상시킬 수 있다는 점, 로의 내면을 탄소재로 피복하면 전기 용융로의 내구성을 향상시킬 수 있다는 점, 그밖에 본 발명의 요지를 일탈하지 않는 범위내에서 각종 변경을 추가할 수 있음은 물론이다.In the embodiment of the present invention, the case where an incineration material of sewage waste is used as the main raw material has been described. However, in order to use the unburned sewage waste itself and to make the inside of the electric melting furnace into a reducing atmosphere, as in the embodiment example of the present invention, the sub-raw material It is also possible to use furnace coke, carbon material, or to minimize the inflow of air into the furnace.Using carbonaceous electrodes as an electrode can improve the durability of the electrode. Coating with a carbon material can improve the durability of the electric melting furnace, and of course, various modifications can be added within the scope not departing from the gist of the present invention.
이상, 설명된 바와 같이 본 발명의 청구범위 제 1 항 및 제 2 항에 기재된 하수 찌꺼기 또는 하수 찌꺼기의 소각재로부터 인을 회수하는 방법에 따르면, 광물 자원으로서 중요한 인을 하수 찌꺼기 또는 하수 찌꺼기의 소각재로부터 인화철로서 회수할 수 있기 때문에, 하수 찌꺼기 또는 하수 찌꺼기의 소각재를 유효하게 이용할 수 있고, 이로써 자원의 활용을 도모할 수 있게 되며, 청구범위 제 3 항 및 제 4 항의 경우에는, 용융물의 철분이 금속철로 변환되도록 촉진되고, 더욱이 인산이 인 단량체로 환원되도록 촉진되므로, 조업의 효율화를 도모할 수 있는 등, 각종 우수한 효과를 거둘 수 있다.As described above, according to the method for recovering phosphorus from the incineration ash of sewage waste or sewage waste according to claims 1 and 2 of the present invention, phosphorus which is important as a mineral resource from the incineration ash of sewage waste or sewage waste is Since it can be recovered as iron phosphide, it is possible to effectively use incineration ash of sewage waste or sewage waste, thereby enabling the utilization of resources, and in the case of claims 3 and 4, the iron content of the melt Since it is promoted to be converted to metal iron and phosphoric acid is further reduced to phosphorus monomer, various excellent effects can be achieved, such as efficiency of operation.
Claims (4)
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| JP2000-010589 | 2000-01-19 | ||
| JP2000010589A JP2001198546A (en) | 2000-01-19 | 2000-01-19 | Phosphorus recovery method from sewage sludge or sewage sludge incineration ash |
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| KR100729009B1 KR100729009B1 (en) | 2007-06-14 |
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| KR101277392B1 (en) * | 2005-01-06 | 2013-06-20 | 산키 고교 가부시키가이샤 | Process for producing phosphatic fertilizer and apparatus therefor |
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| AT503073B1 (en) | 2006-05-03 | 2009-08-15 | Ash Dec Umwelt Ag | METHOD FOR SEPARATING HEAVY METALS AND ASCHEAGGLOMERATE |
| AT509593B1 (en) * | 2010-11-15 | 2011-10-15 | Sgl Carbon Se | METHOD FOR REPROCESSING ORGANIC WASTE MATERIALS |
| JP5941344B2 (en) * | 2012-06-12 | 2016-06-29 | 株式会社クボタ | Compounding agent, seaweed bed structure, vegetation structure, and method for producing compounding agent |
| JP5907834B2 (en) * | 2012-07-25 | 2016-04-26 | 新日鐵住金株式会社 | Method for producing artificial phosphate rock |
| EP4097046A1 (en) * | 2020-02-02 | 2022-12-07 | Radmat AG | Method for separating phosphorus and/or phosphorus compounds from phosphorus carriers and/or phosphate carriers containing iron (oxide) |
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| JPH0853771A (en) * | 1994-08-09 | 1996-02-27 | Nippon Parkerizing Co Ltd | Treatment method of phosphate sludge |
| JP3257377B2 (en) * | 1995-11-22 | 2002-02-18 | 日本鋼管株式会社 | Method for melting waste incineration ash containing phosphorus |
| US6022514A (en) * | 1998-05-18 | 2000-02-08 | Nkk Corporation | Method for recovering phosphorus from organic sludge |
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Termination date: 20210329 Termination category: Expiration of duration |