JP4373951B2 - Method for treating baked product containing chromium oxide - Google Patents
Method for treating baked product containing chromium oxide Download PDFInfo
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- JP4373951B2 JP4373951B2 JP2005103586A JP2005103586A JP4373951B2 JP 4373951 B2 JP4373951 B2 JP 4373951B2 JP 2005103586 A JP2005103586 A JP 2005103586A JP 2005103586 A JP2005103586 A JP 2005103586A JP 4373951 B2 JP4373951 B2 JP 4373951B2
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- 238000000034 method Methods 0.000 title claims description 17
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 title claims description 14
- 229910000423 chromium oxide Inorganic materials 0.000 title claims description 14
- 239000002994 raw material Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 15
- 238000010521 absorption reaction Methods 0.000 claims description 12
- 238000010304 firing Methods 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 10
- 239000011651 chromium Substances 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 9
- 229910052783 alkali metal Inorganic materials 0.000 claims description 8
- 150000001340 alkali metals Chemical class 0.000 claims description 8
- 150000002505 iron Chemical class 0.000 claims description 2
- 239000002699 waste material Substances 0.000 description 27
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 22
- 238000010276 construction Methods 0.000 description 12
- 238000010828 elution Methods 0.000 description 12
- 239000002689 soil Substances 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000003638 chemical reducing agent Substances 0.000 description 9
- 239000002440 industrial waste Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000010801 sewage sludge Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000002956 ash Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 235000003891 ferrous sulphate Nutrition 0.000 description 3
- 239000011790 ferrous sulphate Substances 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 2
- 235000011126 aluminium potassium sulphate Nutrition 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- KWMLJOLKUYYJFJ-UHFFFAOYSA-N 2,3,4,5,6,7-Hexahydroxyheptanoic acid Chemical compound OCC(O)C(O)C(O)C(O)C(O)C(O)=O KWMLJOLKUYYJFJ-UHFFFAOYSA-N 0.000 description 1
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- RMXTYBQNQCQHEU-UHFFFAOYSA-N ac1lawpn Chemical compound [Cr]#[Cr] RMXTYBQNQCQHEU-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- -1 etc.) Chemical compound 0.000 description 1
- 229960002089 ferrous chloride Drugs 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229940050271 potassium alum Drugs 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Description
本発明は、クロムを含有する原料を焼成して得られるクロム酸化物含有焼成物の６価クロム量を低減することができるクロム酸化物含有焼成物の処理方法に関する。 The present invention relates to a method for treating a chromium oxide-containing fired product that can reduce the amount of hexavalent chromium in a chromium oxide-containing fired product obtained by firing a raw material containing chromium.
わが国では、経済成長、人口の都市部への集中に伴い、産業廃棄物や一般廃棄物等が急増している。従来から、前記廃棄物の大半は、焼却によって十分の一程度に減容化し埋め立て処分されているが、最近では埋め立て処分場の残余容量が逼迫していることから、新しい廃棄物処理方法の確率が緊急課題になっている。この課題に対処するために、従来よりセメント産業では、産業廃棄物や一般廃棄物等を原料として骨材、セメント混和材、セメント用等の焼成物が製造されている（例えば、特許文献１）。
しかしながら、上記産業廃棄物や一般廃棄物等には、微量のクロムが含まれており、これらを原料として焼成物を製造すると、得られる焼成物中に６価クロムが含まれることになる。このような焼成物を、骨材等として使用した場合や、粉砕して水硬性材料として使用した場合、焼成物中に含まれる６価クロムが、水質汚染、土質汚染等を引き起こす可能性があるため、６価クロム量を低減させることが望まれている。 However, trace amounts of chromium are contained in the industrial waste, general waste, and the like, and when calcined products are produced using these as raw materials, hexavalent chromium is contained in the obtained calcined product. When such a fired product is used as an aggregate or the like, or when pulverized and used as a hydraulic material, hexavalent chromium contained in the fired product may cause water pollution, soil pollution, or the like. Therefore, it is desired to reduce the amount of hexavalent chromium.
従って、本発明の目的は、クロムを含有する原料を焼成して得られるクロム酸化物含有焼成物の６価クロム量を低減することができるクロム酸化物含有焼成物の処理方法を提供することにある。 Accordingly, an object of the present invention is to provide a method for treating a chromium oxide-containing fired product that can reduce the amount of hexavalent chromium in a chromium oxide-containing fired product obtained by firing a raw material containing chromium. is there.
本発明者らは、斯かる実情に鑑み、鋭意研究した結果、クロムを含有する原料を焼成して得られる焼成物を液体で洗浄処理することにより、６価クロム量が低減された焼成物が得られることを見いだし、本発明を完成させたものである。
即ち、本発明は、クロムを含有する原料を焼成して得られるクロム酸化物含有焼成物を液体で洗浄するクロム酸化物含有焼成物の処理方法であって、前記液体が２価の鉄塩を0.1質量％以上含有する水溶液であり、前記焼成物の吸水率が1.0％以上であることを特徴とするクロム酸化物含有焼成物の処理方法である。
また、焼成物がアルカリ金属元素を含むことが好ましい。
As a result of diligent research in view of such circumstances, the present inventors have obtained a fired product in which the amount of hexavalent chromium has been reduced by washing a fired product obtained by firing a raw material containing chromium with a liquid. The present invention has been found out and completed.
That is, the present invention is a method for treating a chromium oxide-containing fired product obtained by firing a chromium oxide-containing fired product obtained by firing a chromium-containing raw material, wherein the liquid contains a divalent iron salt. A method for treating a chromium oxide-containing fired product, characterized in that it is an aqueous solution containing 0.1% by mass or more , and the water absorption of the fired product is 1.0% or more.
The fired product preferably contains an alkali metal element.
本発明では、クロムを含有する原料を用いても、６価クロム量が低減された焼成物が得られる。そして、この焼成物は、骨材や路盤材、粉砕して水硬性材料等に使用しても、環境汚染の問題がない。
また、本発明では、産業廃棄物、一般廃棄物及び建設発生土から選ばれる一種以上を焼成物の原料として使用することができるので、廃棄物の有効利用の促進にも貢献することができる。
In the present invention, a fired product having a reduced amount of hexavalent chromium can be obtained even when a raw material containing chromium is used. And even if this baked product is used for aggregates, roadbed materials, pulverized hydraulic materials, etc., there is no problem of environmental pollution.
Moreover, in this invention, since 1 or more types chosen from an industrial waste, a general waste, and construction generation | occurence | production soil can be used as a raw material of a baked material, it can also contribute to promotion of the effective utilization of a waste material.
以下、本発明について詳細に説明する。
本発明において、焼成物の原料としては、一般のポルトランドセメントクリンカー原料、すなわち石灰石、生石灰、消石灰等のCaO原料、珪石、粘土等のSiO2原料、粘土等のAl2O3原料、鉄滓、鉄ケーキ等のFe2O3原料を使用することができる。
また、産業廃棄物、一般廃棄物及び建設発生土から選ばれる一種以上を使用することができる。焼成物の原料として、産業廃棄物、一般廃棄物及び建設発生土から選ばれる一種以上のものを使用することは、廃棄物の有効利用を促進させることができ好ましいことである。ここで、産業廃棄物としては、例えば、生コンスラッジ、各種汚泥（例えば、下水汚泥、浄水汚泥、建設汚泥、製鉄汚泥等）、建設廃材、コンクリート廃材、ボーリング廃土、各種焼却灰、鋳物砂、ロックウール、廃ガラス、高炉２次灰等が挙げられる。一般廃棄物としては、例えば、下水汚泥乾粉、都市ごみ焼却灰、貝殻等が挙げられる。建設発生土としては、建設現場や工事現場等から発生する土壌や残土、さらには廃土壌等が挙げられる。
これらのうち、粘土、鉄滓、産業廃棄物、一般廃棄物、建設発生土にはクロムが多く含まれるものがある。
Hereinafter, the present invention will be described in detail.
In the present invention, as a raw material of the fired product, a general Portland cement clinker raw material, that is, a CaO raw material such as limestone, quick lime, slaked lime, a SiO 2 raw material such as silica and clay, an Al 2 O 3 raw material such as clay, iron slag, Fe 2 O 3 raw materials such as iron cake can be used.
Moreover, 1 or more types chosen from industrial waste, general waste, and construction generation | occurrence | production soil can be used. The use of one or more materials selected from industrial waste, general waste, and construction generated soil as the raw material for the baked product is preferable because it can promote effective use of the waste. Here, as industrial waste, for example, raw consludge, various sludges (for example, sewage sludge, purified water sludge, construction sludge, iron sludge, etc.), construction waste, concrete waste, boring waste, various incineration ash, foundry sand, Examples thereof include rock wool, waste glass, and blast furnace secondary ash. Examples of the general waste include sewage sludge dry powder, municipal waste incineration ash, and shells. Examples of construction generated soil include soil and residual soil generated from construction sites and construction sites, and waste soil.
Among these, clay, iron slag, industrial waste, general waste, and construction waste soil contain a lot of chromium.
本発明においては、焼成物の原料として、上記原料に加えて、アルカリ金属元素含有原料を使用することが好ましい。焼成物がアルカリ金属元素を含むことにより、液体で洗浄した場合の６価クロム量の低減効果をより大きくすることができる。
アルカリ金属元素含有原料としては、カリミョウバン等を使用することができる。
焼成物中のアルカリ金属元素量は、アルカリ金属酸化物として2質量％以下が好ましい。焼成物中のアルカリ金属元素量が多くなると、焼成中のアルカリ金属の揮発が大きくなり、これらを処理するための設備が別途必要になる。
In the present invention, it is preferable to use an alkali metal element- containing raw material in addition to the above raw materials as the raw material of the fired product. When the fired product contains an alkali metal element , the effect of reducing the amount of hexavalent chromium when washed with a liquid can be further increased.
As an alkali metal element- containing raw material, potassium alum or the like can be used.
The amount of alkali metal element in the fired product is preferably 2% by mass or less as an alkali metal oxide. When the amount of the alkali metal element in the fired product increases, the volatilization of the alkali metal during the firing increases, and a separate facility for treating these becomes necessary.
上記原料を、水硬率（H.M.）が好ましくは0.05〜2.3、より好ましくは0.5以上1.5未満となるように混合して焼成することにより、焼成物を製造する。
焼成温度は、目的とする焼成物の水硬率（H.M.）に応じて設定するのが好ましく、焼成物の水硬率（H.M.）が1.5未満の場合、焼成温度は1000〜1350℃、特に1150〜1350℃であるのが好ましい。焼成物の水硬率（H.M.）が1.5〜2.3の場合、焼成温度は1200〜1550℃、特に1350〜1450℃であるのが好ましい。
A fired product is produced by mixing and firing the raw materials so that the hydraulic modulus (HM) is preferably 0.05 to 2.3, more preferably 0.5 to less than 1.5.
The firing temperature is preferably set according to the hydraulic modulus (HM) of the desired fired product. When the hydraulic modulus (HM) of the fired product is less than 1.5, the firing temperature is 1000 to 1350 ° C., particularly 1150 It is preferably ˜1350 ° C. When the hydraulic modulus (HM) of the fired product is 1.5 to 2.3, the firing temperature is preferably 1200 to 1550 ° C, particularly preferably 1350 to 1450 ° C.
本発明においては、焼成物の吸水率が大きいほど、液体で洗浄した場合の６価クロム量の低減効果が大きくなるので、焼成物の吸水率は、0.3％以上であることが好ましく、0.5％以上であることがより好ましく、1.0％以上であることが特に好ましい。なお、吸水率は、「JIS A 1135」に準じて測定される値である。 In the present invention, the greater the water absorption rate of the fired product, the greater the effect of reducing the amount of hexavalent chromium when washed with a liquid. Therefore, the water absorption rate of the fired product is preferably 0.3% or more, 0.5% More preferably, it is more preferably 1.0% or more. The water absorption is a value measured according to “JIS A 1135”.
各原料を混合する方法は特に制限されず、慣用の装置等を用いて行うことができる。
また、焼成に使用する装置も特に制限されず、例えば、ロータリーキルン等を用いることができる。ロータリーキルンで焼成する際には、燃料代替廃棄物、例えば、廃油、廃タイヤ、廃プラスチック等を使用することができる。
The method for mixing the raw materials is not particularly limited, and can be performed using a conventional apparatus or the like.
Moreover, the apparatus used for baking is not particularly limited, and for example, a rotary kiln or the like can be used. When firing in a rotary kiln, alternative fuel wastes such as waste oil, waste tires, waste plastics, etc. can be used.
本発明では、上記クロム酸化物含有焼成物を液体で洗浄する。液体で洗浄する方法としては、例えば、
(1)焼成物を収容施設に収容した後、この収容施設の上部からスプリンクラー等により液体を散布する方法、
(2)焼成物をベルトコンベアに供給し、上方のスプレーノズルから液体を散布する方法、
(3)焼成物を液体を入れた容器に供給して浸漬する方法、
等が挙げられる。
洗浄後の６価クロムを含有する洗浄液は、還元剤で処理した後、廃棄することができる。
In the present invention, the baked product containing chromium oxide is washed with a liquid. As a method of cleaning with a liquid, for example,
(1) After storing the baked product in the storage facility, a method of spraying liquid from the top of the storage facility with a sprinkler
(2) A method of supplying the fired product to a belt conveyor and spraying liquid from an upper spray nozzle,
(3) A method of supplying and dipping the fired product into a container containing a liquid,
Etc.
The washing liquid containing hexavalent chromium after washing can be discarded after being treated with a reducing agent.
洗浄に使用する液体としては、水、還元剤を含有する水溶液、アルコールやアセトン等が挙げられる。アルコールとしては、メタノールやエタノール等が挙げられる。
本発明では、コストや取り扱いの容易性等から、洗浄に使用する液体としては、水又は還元剤を含有する水溶液を使用することが好ましい。還元剤を含有する水溶液を使用した場合は、水溶液中に溶出してくる６価クロムが還元されて３価クロムになるので、洗浄水を処理することなく廃棄することができる。かかる還元剤としては、２価の鉄塩（例えば、硫酸第一鉄、塩化第一鉄等）や亜硫酸ナトリウム、チオ硫酸ナトリウム等が挙げられる。
還元剤を含有する水溶液を使用する場合、還元剤の濃度は0.1質量％以上であることが好ましい。
Examples of the liquid used for washing include water, an aqueous solution containing a reducing agent, alcohol and acetone. Examples of the alcohol include methanol and ethanol.
In the present invention, it is preferable to use water or an aqueous solution containing a reducing agent as the liquid used for cleaning because of cost and ease of handling. When an aqueous solution containing a reducing agent is used, hexavalent chromium eluted in the aqueous solution is reduced to trivalent chromium, so that it can be discarded without treating the washing water. Examples of the reducing agent include divalent iron salts (for example, ferrous sulfate, ferrous chloride, etc.), sodium sulfite, sodium thiosulfate, and the like.
When using the aqueous solution containing a reducing agent, it is preferable that the density | concentration of a reducing agent is 0.1 mass% or more.
なお、本発明において、水硬率（H.M.）が1.5以上の焼成物を水又は還元剤を含有する水溶液で洗浄する場合は、該焼成物の水和生成物に６価クロムが取り込まれて効率的な６価クロムの除去が困難になるので、焼成物の水和を抑制することができる成分を水又は還元剤を含有する水溶液に添加することが好ましい。かかる成分としては、例えば、硫酸塩、糖類、クエン酸、ヘプトン酸等の遅延剤が挙げられる。 In the present invention, when a fired product having a hydraulic modulus (HM) of 1.5 or more is washed with water or an aqueous solution containing a reducing agent, hexavalent chromium is incorporated into the hydrated product of the fired product and efficiency is increased. Therefore, it is preferable to add a component capable of suppressing hydration of the fired product to water or an aqueous solution containing a reducing agent. Examples of such components include retarders such as sulfates, saccharides, citric acid and heptonic acid.
液体で洗浄した後の焼成物は、モルタル・コンクリート用の骨材や路盤材等として使用することができる。また、粉砕して、石膏や高炉スラグ、フライアッシュ等と混合して水硬性材料として使用することができる。 The fired product after washing with a liquid can be used as an aggregate or roadbed material for mortar and concrete. Moreover, it can grind | pulverize and can mix with gypsum, blast furnace slag, fly ash, etc., and can be used as a hydraulic material.
以下、実施例により本発明を説明する。
実施例１
１．焼成物の製造
原料として、下水汚泥、建設発生土、石灰石等の一般のポルトランドセメントクリンカー原料を使用して、水硬率（H.M.）が0.9となるように原料を調合した。
上記調合原料を、小型ロータリーキルンを用いて1300℃で焼成し、吸水率が0.2％の焼成物Ａ、吸水率が1.0％の焼成物Ｂ、吸水率が3.0％の焼成物Ｃを製造した。この際、燃料として一般的な重油のほかに、廃油や廃プラスチックを使用した。
なお、吸水率は、「JIS A 1135」に準じて測定した。
Hereinafter, the present invention will be described by way of examples.
Example 1
1. Manufacture of baked product The raw material was prepared so that hydraulic modulus (HM) might be set to 0.9 using common Portland cement clinker raw materials such as sewage sludge, construction generated soil, and limestone.
The above prepared raw materials were fired at 1300 ° C. using a small rotary kiln to produce a fired product A having a water absorption rate of 0.2%, a fired product B having a water absorption rate of 1.0%, and a fired product C having a water absorption rate of 3.0%. In this case, waste oil and waste plastic were used in addition to general heavy oil as fuel.
The water absorption was measured according to “JIS A 1135”.
２．６価クロム溶出量の測定（その１）
上記各焼成物を収容施設に収容した後、この収容施設の上部からスプリンクラーにより焼成物と同量の水を散水する処理を繰り返し行い焼成物を洗浄した。
散水前と散水後の各焼成物の６価クロム溶出量を、環境庁告示第４６号に準じて測定した。
その結果を表１に示す
2. Measurement of hexavalent chromium elution amount (1)
After each of the fired products was stored in a storage facility, the process of spraying the same amount of water as the fired product was repeated with a sprinkler from the top of the storage facility to wash the fired product.
The amount of elution of hexavalent chromium in each fired product before watering and after watering was measured according to Environment Agency Notification No. 46.
The results are shown in Table 1.
３．６価クロム溶出量の測定（その２）
上記焼成物Ｂに対して、硫酸第一鉄１％水溶液を洗浄水として使用して、上記２．と同様にして洗浄した。
散水前と散水後の各焼成物の６価クロム溶出量を、環境庁告示第４６号に準じて測定した。
その結果を表２に示す
3. Measurement of hexavalent chromium elution (Part 2)
For the fired product B, a 1% aqueous solution of ferrous sulfate is used as washing water, and the above 2. Washed in the same way as
The amount of elution of hexavalent chromium in each fired product before watering and after watering was measured according to Environment Agency Notification No. 46.
The results are shown in Table 2.
４．６価クロム溶出量の測定（その３）
上記各焼成物Ａ〜Ｃ(１kg)を水(２kg)を入れた容器に供給して６時間浸漬した後、水を排水する処理を繰り返し行い焼成物を洗浄した。
浸漬前と浸漬後の各焼成物の６価クロム溶出量を、環境庁告示第４６号に準じて測定した。
その結果を表３に示す
4. Measurement of elution amount of hexavalent chromium (Part 3)
Each of the fired products A to C (1 kg) was supplied to a container containing water (2 kg) and immersed for 6 hours, and then the process of draining water was repeated to wash the fired product.
The amount of elution of hexavalent chromium in each fired product before and after immersion was measured according to Environment Agency Notification No. 46.
The results are shown in Table 3.
３．６価クロム溶出量の測定（その４）
上記焼成物Ｂに対して、硫酸第一鉄１％水溶液を洗浄水として使用して、上記４．と同様にして洗浄した。
浸漬前と浸漬後の各焼成物の６価クロム溶出量を、環境庁告示第４６号に準じて測定した。
その結果を表４に示す
3. Measurement of elution amount of hexavalent chromium (Part 4)
For the calcined product B, using a 1% aqueous solution of ferrous sulfate as washing water, Washed in the same way as
The amount of elution of hexavalent chromium in each fired product before and after immersion was measured according to Environment Agency Notification No. 46.
The results are shown in Table 4.
実施例２
１．焼成物の製造
原料として、下水汚泥、建設発生土、カリミョウバン、石灰石等の一般のポルトランドセメントクリンカー原料を使用して、水硬率（H.M.）が0.9となるように原料を調合した。
上記調合原料を、小型ロータリーキルンを用いて1300℃で焼成し、吸水率が1.0％、アルカリ金属酸化物量が1.0質量％の焼成物Ｄを製造した。この際、燃料として一般的な重油のほかに、廃油や廃プラスチックを使用した。
Example 2
1. Manufacture of baked product The raw material was prepared so that a hydraulic modulus (HM) might be set to 0.9 using common Portland cement clinker raw materials such as sewage sludge, construction generated soil, potash alum and limestone.
The blended raw material was fired at 1300 ° C. using a small rotary kiln, and a fired product D having a water absorption rate of 1.0% and an alkali metal oxide content of 1.0% by mass was produced. In this case, waste oil and waste plastic were used in addition to general heavy oil as fuel.
２．６価クロム溶出量の測定
上記焼成物Ｄを収容施設に収容した後、この収容施設の上部からスプリンクラーにより焼成物と同量の水を散水する処理を繰り返し行い焼成物を洗浄した。
散水前と散水後の各焼成物の６価クロム溶出量を、環境庁告示第４６号に準じて測定した。
その結果を表５に示す
2. Measurement of 6-valent chromium elution amount After the calcined product D was accommodated in the accommodation facility, the fired product was washed by repeatedly sprinkling water in the same amount as the calcined product with a sprinkler from the upper part of the accommodation facility.
The amount of elution of hexavalent chromium in each fired product before watering and after watering was measured according to Environment Agency Notification No. 46.
The results are shown in Table 5.
実施例３
１．焼成物の製造
原料として、下水汚泥、建設発生土、石灰石等の一般のポルトランドセメントクリンカー原料を使用して、水硬率（H.M.）が1.35となるように原料を調合した。
上記調合原料を、小型ロータリーキルンを用いて1350℃で焼成し、吸水率が0.2％の焼成物Ｅ、吸水率が3.0％の焼成物Ｆを製造した。この際、燃料として一般的な重油のほかに、廃油や廃プラスチックを使用した。
Example 3
1. Manufacture of baked product The raw material was prepared so that the hydraulic modulus (HM) would be 1.35 using general Portland cement clinker raw materials such as sewage sludge, construction generated soil, and limestone.
The blended raw material was fired at 1350 ° C. using a small rotary kiln to produce a fired product E having a water absorption rate of 0.2% and a fired product F having a water absorption rate of 3.0%. In this case, waste oil and waste plastic were used in addition to general heavy oil as fuel.
２．６価クロム溶出量の測定
上記各焼成物を収容施設に収容した後、この収容施設の上部からスプリンクラーにより焼成物と同量の水を散水する処理を繰り返し行い焼成物を洗浄した。
散水前と散水後の各焼成物の６価クロム溶出量を、環境庁告示第４６号に準じて測定した。
その結果を表６に示す
2.6 Measurement of Elution Rate of Chromium Chromium After each of the fired products was stored in a storage facility, the fired product was washed by repeatedly sprinkling the same amount of water as the fired product from the top of the storage facility using a sprinkler.
The amount of elution of hexavalent chromium in each fired product before watering and after watering was measured according to Environment Agency Notification No. 46.
The results are shown in Table 6.
Claims (3)
前記液体が２価の鉄塩を0.1質量％以上含有する水溶液であり、
前記焼成物の吸水率が1.0％以上であることを特徴とするクロム酸化物含有焼成物の処理方法。 A method for treating a chromium oxide-containing fired product, which comprises washing a chromium oxide-containing fired product obtained by firing a raw material containing chromium with a liquid,
The liquid is an aqueous solution containing 0.1 mass% or more of a divalent iron salt ,
A method for treating a chromium oxide-containing fired product, wherein the fired product has a water absorption of 1.0% or more.
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