JP5617182B2 - Method for processing iron-containing slurry - Google Patents
Method for processing iron-containing slurry Download PDFInfo
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- JP5617182B2 JP5617182B2 JP2009086284A JP2009086284A JP5617182B2 JP 5617182 B2 JP5617182 B2 JP 5617182B2 JP 2009086284 A JP2009086284 A JP 2009086284A JP 2009086284 A JP2009086284 A JP 2009086284A JP 5617182 B2 JP5617182 B2 JP 5617182B2
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 113
- 239000002002 slurry Substances 0.000 title claims description 89
- 229910052742 iron Inorganic materials 0.000 title claims description 56
- 238000000034 method Methods 0.000 title claims description 21
- 238000003723 Smelting Methods 0.000 claims description 24
- 208000005156 Dehydration Diseases 0.000 claims description 23
- 230000018044 dehydration Effects 0.000 claims description 22
- 238000006297 dehydration reaction Methods 0.000 claims description 22
- 239000000428 dust Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 17
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 16
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 238000011282 treatment Methods 0.000 claims description 10
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 8
- 238000005119 centrifugation Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 19
- 230000000694 effects Effects 0.000 description 11
- 235000011181 potassium carbonates Nutrition 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 239000002562 thickening agent Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000002156 mixing Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000002776 aggregation Effects 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000008186 active pharmaceutical agent Substances 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011328 necessary treatment Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
本発明は、鉄を主成分とする粉粒物を含む鉄含有スラリーを遠心分離機等で脱水処理して濃縮するに当たり、脱水効率を改善すると共に、脱水により得られた濃縮スラリーの流動性、更には乾燥効率を改善する方法に関する。 The present invention improves the dehydration efficiency and concentrates the fluidity of the concentrated slurry obtained by dehydration when dehydrating and concentrating the iron-containing slurry containing fine particles containing iron as a main component with a centrifugal separator, Furthermore, it relates to a method for improving the drying efficiency.
本発明の鉄含有スラリーの処理方法は、製錬炉、精錬炉又は溶解炉において、湿式集塵ダストを含む鉄含有スラリーを炉の原材料（原料、副原料、還元剤など）として再利用する際の鉄含有スラリーの脱水効率の向上技術として有用である。 The iron-containing slurry treatment method of the present invention is a method for reusing iron-containing slurry containing wet dust collection dust as raw materials (raw materials, auxiliary materials, reducing agents, etc.) in a smelting furnace, smelting furnace or melting furnace. This is useful as a technique for improving the dewatering efficiency of the iron-containing slurry.
鉄鋼等の製錬炉、精錬炉又は溶解炉では、炉から排出されるガスに大量のダストが飛散し、このダストはベンチュリースクラバーなどにより湿式集塵された後、リサイクルされている。しかし、水分を多量に含む湿式集塵ダストをそのまま溶融還元炉等の湯面に供給した場合、ダストとともに投入される水分が炉の熱効率を低下させてしまう。 In a smelting furnace such as steel, a smelting furnace, or a melting furnace, a large amount of dust is scattered in the gas discharged from the furnace, and this dust is recycled after being wet collected by a venturi scrubber or the like. However, when wet dust collection dust containing a large amount of moisture is supplied as it is to the surface of a molten metal such as a smelting reduction furnace, moisture introduced together with the dust reduces the thermal efficiency of the furnace.
そこで従来では、このような湿式集塵されたダストをリサイクルする場合、集塵ダストをシックナー等で沈降分離して水分７０％程度の高濃度スラリーとし、このスラリーをフィルタプレスや遠心分離機などの脱水機により濃縮した後、濃縮スラリーを乾燥し、更に、造粒、養生等の必要な処理を施した上で各々の炉にリサイクルしている。このように、スラリーの濃縮、乾燥を行うことは、鉄含有スラリーの減容化で取り扱い性や処理効率が向上するという効果も得られる。 Therefore, conventionally, when recycling such wet dust collected dust, the dust collected is settled and separated by a thickener or the like into a high concentration slurry having a water content of about 70%, and this slurry is used for a filter press, a centrifuge, etc. After concentration by a dehydrator, the concentrated slurry is dried and further subjected to necessary treatments such as granulation and curing, and then recycled to each furnace. As described above, the concentration and drying of the slurry also provides an effect that the handleability and the processing efficiency are improved by reducing the volume of the iron-containing slurry.
従来、このような鉄含有スラリーの脱水効率の向上のために、高分子凝集剤を添加する方法が提案されている（特許文献１）。 Conventionally, in order to improve the dewatering efficiency of such iron-containing slurry, a method of adding a polymer flocculant has been proposed (Patent Document 1).
しかしながら、鉄含有スラリーに高分子凝集剤を添加することにより、凝集フロックの形成で脱水効率は向上するものの、高分子凝集剤の添加でスラリーの粘性が上がることで、脱水後の濃縮スラリーの流動性が悪化し、次工程への移送が困難になるという問題があった。 However, by adding a polymer flocculant to the iron-containing slurry, the dewatering efficiency is improved by forming a floc floc. However, the addition of the polymer flocculant increases the viscosity of the slurry, so that the flow of the concentrated slurry after dehydration is increased. There was a problem that the property deteriorated and the transfer to the next process became difficult.
また、通常、脱水濃縮されたスラリーは、次いで乾燥工程で乾燥処理されるが、スラリー粘度が上がると、乾燥用空気との接触効率が悪くなることで乾燥不良などの不具合が発生するという問題がある。 Usually, the dehydrated and concentrated slurry is then subjected to a drying process in a drying process. However, when the slurry viscosity is increased, there is a problem that problems such as poor drying occur due to poor contact efficiency with drying air. is there.
本発明は上記従来の問題点を解決し、鉄含有スラリーを遠心分離機等で脱水処理する際の脱水効率を改善すると共に、脱水処理で得られた濃縮スラリーの流動性を高め、その後の乾燥効率をも改善することができる鉄含有スラリーの処理方法を提供することを目的とする。 The present invention solves the above-mentioned conventional problems, improves the dehydration efficiency when the iron-containing slurry is dehydrated with a centrifugal separator or the like, and increases the fluidity of the concentrated slurry obtained by the dehydration treatment, and then drying It aims at providing the processing method of the iron containing slurry which can also improve efficiency.
本発明（請求項１）の鉄含有スラリーの処理方法は、鉄を主成分とする粉粒物を含むスラリーを脱水処理により濃縮する濃縮工程を備える鉄含有スラリーの処理方法において、該鉄含有スラリーは、製錬炉、精錬炉又は溶解炉で発生する湿式集塵ダストを含む鉄含有スラリーであり、該鉄含有スラリーに炭酸カリウムを添加して脱水処理することを特徴とする。 Method of processing iron-containing slurry of the present invention (Claim 1), in the processing method of the iron-containing slurry comprising a concentration step of concentrating the slurry containing the particulate material containing iron as a main component by dehydration treatment, the iron-containing slurry Is an iron-containing slurry containing wet dust collection dust generated in a smelting furnace, smelting furnace, or melting furnace, and is characterized by adding potassium carbonate to the iron-containing slurry for dehydration treatment.
請求項２の鉄含有スラリーの処理方法は、請求項１において、前記脱水処理を遠心分離により行うことを特徴とする。
The method for treating an iron-containing slurry according to claim 2 is characterized in that, in
請求項３の鉄含有スラリーの処理方法は、請求項１又は２において、前記濃縮工程からの濃縮スラリーを乾燥工程に移送することを特徴とする。
A method for treating an iron-containing slurry according to claim 3 is characterized in that, in
請求項４の鉄含有スラリーの処理方法は、請求項１ないし３のいずれか１項において、前記乾燥工程からの乾燥物が、製錬炉、精錬炉又は溶解炉に装入されることを特徴とする。
Method of processing iron-containing slurry 請 Motomeko 4, in any one of
本発明の鉄含有スラリーの処理方法では、鉄含有スラリーに炭酸塩及び／又は重炭酸塩（以下、これらを「（重）炭酸塩」と称す場合がある。）を添加することにより、一剤の薬剤添加で下記（１），（２）の効果を得ることができる。
（１） 遠心分離機等の脱水機の脱水効率を改善することができる。
（２） 脱水後の濃縮スラリーの流動性を、薬剤を添加しない場合に比べて改善することができる。
In the method for treating an iron-containing slurry of the present invention, one agent is obtained by adding carbonate and / or bicarbonate (hereinafter, these may be referred to as “(bi) carbonate”) to the iron-containing slurry. The following effects (1) and (2) can be obtained by adding the chemicals.
(1) The dehydration efficiency of a dehydrator such as a centrifugal separator can be improved.
(2) The fluidity of the concentrated slurry after dehydration can be improved compared to when no chemical is added.
（重）炭酸塩添加により上記（１），（２）の効果が得られる作用機構の詳細は明らかではないが、（重）炭酸塩は、スラリー中のＳＳのゼータ電位をゼロに近づけ、微凝集を促進する結果、ＳＳの沈降性が増し、脱水機での脱水分離効率が改善されると共に、ＳＳの微凝集で濃縮スラリーの粘性が下がり、流動性が改善されるものと考えられる。 Although the details of the mechanism of action by which the effects of (1) and (2) are obtained by addition of (bi) carbonate are not clear, (bi) carbonate brings the zeta potential of SS in the slurry close to zero, As a result of promoting aggregation, it is considered that SS sedimentation increases, the efficiency of dehydration separation in the dehydrator is improved, and the viscosity of the concentrated slurry decreases due to the fine aggregation of SS, thereby improving the fluidity.
このため、本発明によれば、脱水処理で得られた濃縮スラリーを効率的に次工程に移送することができ、特に、次工程が乾燥工程である場合、濃縮スラリーの粘性が低いために乾燥用空気との接触効率が良くなることで、乾燥効率も向上する。 For this reason, according to the present invention, the concentrated slurry obtained by the dehydration process can be efficiently transferred to the next step. In particular, when the next step is a drying step, the concentrated slurry is low in viscosity because of low viscosity. Drying efficiency is also improved by improving the contact efficiency with the working air.
以下に本発明の鉄含有スラリーの処理方法の実施の形態を詳細に説明する。 Hereinafter, embodiments of the method for treating an iron-containing slurry of the present invention will be described in detail.
本発明の鉄含有スラリーの処理方法は、鉄を主成分とする粉粒物を含むスラリーを遠心分離機等により脱水処理して濃縮するに当たり、該鉄含有スラリーに（重）炭酸塩を添加して脱水処理することを特徴とする。 The method for treating an iron-containing slurry of the present invention comprises adding (bi) carbonate to the iron-containing slurry when dehydrating and concentrating the slurry containing iron particles as a main component using a centrifugal separator or the like. And dehydrated.
本発明で処理対象とする鉄含有スラリーは、代表的には、前述の製錬炉、精錬炉又は溶解炉等における湿式集塵ダストをシックナー等で濃縮して得られるスラリーであり、鉄を主成分とする粉粒物を高濃度で含むものである。ここで鉄を主成分とする粉粒物とは、Ｔｏｔａｌ Ｆｅ（全鉄）として４０質量％以上含有する粉粒物を指し、鉄の存在形態としては、金属鉄である場合の他、酸化物としても存在する。 The iron-containing slurry to be treated in the present invention is typically a slurry obtained by concentrating wet dust collection dust in a smelting furnace, smelting furnace, melting furnace or the like with a thickener or the like, and mainly contains iron. It contains a granular material as a component at a high concentration. Here, the granular material containing iron as a main component refers to a granular material containing 40% by mass or more as Total Fe (total iron), and the presence form of iron is an oxide other than the case of metallic iron. Exist as well.
この鉄含有スラリーの水質としては、例えば、次のような水質が挙げられる。
ＳＳ濃度：１０〜６０質量％
ｐＨ：８〜１３
Examples of the water quality of the iron-containing slurry include the following water qualities.
SS concentration: 10 to 60% by mass
pH: 8-13
このような鉄含有スラリーに添加する（重）炭酸塩としては特に制限はなく、炭酸カリウム、炭酸ナトリウム等の炭酸塩や重炭酸ナトリウム、重炭酸カリウム等の重炭酸塩を用いることができる。これらは１種を単独で用いても良く、２種以上を混合して用いても良い。 The (bi) carbonate added to such iron-containing slurry is not particularly limited, and carbonates such as potassium carbonate and sodium carbonate, and bicarbonates such as sodium bicarbonate and potassium bicarbonate can be used. These may be used alone or in combination of two or more.
（重）炭酸塩の添加量は、処理対象とする鉄含有スラリーの水質（ＳＳ濃度）によっても異なるが、鉄含有スラリーに対して１００〜２０００ｍｇ／Ｌ、特に２５０〜５００ｍｇ／Ｌとすることが好ましい。（重）炭酸塩添加量が少な過ぎると十分な脱水性の向上効果を得ることができず、多過ぎると添加薬剤費が高くつき好ましくない。 The amount of (heavy) carbonate added varies depending on the water quality (SS concentration) of the iron-containing slurry to be treated, but is 100 to 2000 mg / L, particularly 250 to 500 mg / L with respect to the iron-containing slurry. preferable. If the amount of (heavy) carbonate added is too small, a sufficient dehydrating effect cannot be obtained.
（重）炭酸塩の添加形態としては、粉末で添加しても、水に溶解させて液体として添加しても良いが、スラリーとの均一混合性の面から液状で添加することが効果的である。 As the addition form of (heavy) carbonate, it may be added as a powder, or dissolved in water and added as a liquid, but it is effective to add it in a liquid form from the viewpoint of uniform mixing with the slurry. is there.
液状で添加する場合、水に対する溶解度の高いものを用いて、高濃度溶液として添加することが好ましく、この観点から、炭酸カリウムを用いることが、薬剤コストの低減にも繋がり有利である。なお、（重）炭酸塩を水溶液として添加する場合、１０〜５０質量％程度の濃度の水溶液として添加することが好ましい。 When added in a liquid state, it is preferable to add a high-concentration solution using a substance having high solubility in water. From this viewpoint, it is advantageous to use potassium carbonate because it leads to a reduction in drug cost. In addition, when adding (bi) carbonate as aqueous solution, it is preferable to add as aqueous solution with a density | concentration of about 10-50 mass%.
また、（重）炭酸塩を鉄含有スラリーに添加するに当っては、撹拌を行って、（重）炭酸塩と鉄含有スラリーとを十分に均一に混合することが好ましい。この場合、混合時間が短か過ぎると十分な凝集効果が得られず、長過ぎると微凝集されたＳＳが破壊されてしまうことから、撹拌混合時間は１〜２４時間程度とすることが好ましい。 Moreover, when adding (bi) carbonate to an iron-containing slurry, it is preferable to stir and mix (bi) carbonate and iron-containing slurry sufficiently uniformly. In this case, if the mixing time is too short, a sufficient agglomeration effect cannot be obtained, and if it is too long, the finely agglomerated SS is destroyed. Therefore, the stirring and mixing time is preferably about 1 to 24 hours.
本発明の鉄含有スラリーの処理方法は、前述の如く、製錬炉、精錬炉又は溶解炉等における湿式集塵ダストをシックナー等で濃縮して得られるスラリーを脱水し、更に乾燥処理して次工程に送給する場合に好適であり、この場合、例えば、図１（ａ）に示す如く、シックナー１で沈降分離して得られた濃縮スラリーを、脱水機３に移送する配管の途中部分に貯留槽２を設け、この貯留槽２で（重）炭酸塩を添加して撹拌混合して凝集性を改善し、（重）炭酸塩を添加混合した鉄含有スラリーを脱水機３を経て乾燥機４に送給するようにすることが好ましい。なお、図１（ｂ）に示す如く、脱水機３からの濃縮スラリーを乾燥機４に移送する配管の途中部分にも滞留槽としての貯留槽５を設け、この貯留槽５で撹拌混合した後乾燥機４に送給するようにしても良い。
The treatment method of the iron-containing slurry of the present invention is, as described above, dehydrating a slurry obtained by concentrating wet dust collection dust in a smelting furnace, smelting furnace or melting furnace with a thickener or the like, followed by further drying treatment. In this case, for example, as shown in FIG. 1 (a), the concentrated slurry obtained by sedimentation and separation by the
いずれも場合でも、鉄含有スラリーに（重）炭酸塩を添加混合することにより、脱水機３での脱水性を高め、また、得られた濃縮スラリーの流動性も高めてこの濃縮スラリーを円滑に乾燥機４に移送すると共に、乾燥機４において、効率的に乾燥処理することができる。 In either case, by adding and mixing (bi) carbonate to the iron-containing slurry, the dehydrating property in the dehydrator 3 is increased, and the fluidity of the obtained concentrated slurry is also increased, so that this concentrated slurry can be made smooth. While being transferred to the dryer 4, the drying process can be efficiently performed in the dryer 4.
なお、（重）炭酸塩は、この貯留槽２の上流側の配管で添加して、貯留槽２で撹拌混合するようにしても良い。 The (heavy) carbonate may be added through a pipe on the upstream side of the storage tank 2 and stirred and mixed in the storage tank 2.
また、本発明において、脱水機３としては、特に制限はなく、フィルタープレス等であっても良いが、（重）炭酸塩によるＳＳの微凝集による沈降性向上効果を有効に得ることができることから、遠心分離機であることが好ましい。 In the present invention, the dehydrator 3 is not particularly limited and may be a filter press or the like. However, it is possible to effectively obtain a sedimentation improvement effect due to fine aggregation of SS by (bi) carbonate. A centrifuge is preferred.
鉄含有スラリーは、脱水機３及び乾燥機４を経て脱水、乾燥された後、解砕、調湿、造粒、養生等の必要な処理を施した上で製錬炉、精錬炉又は溶解炉等に導入される。 The iron-containing slurry is dehydrated and dried through a dehydrator 3 and a dryer 4, and then subjected to necessary treatments such as crushing, humidity conditioning, granulation, and curing, and then a smelting furnace, a smelting furnace, or a melting furnace Etc.
本発明者らの知見では、本発明を適用した結果、乾燥機４における乾燥トラブルは従来の１／５程度に削減でき、乾燥量ひいては精錬炉等での鉄生産量は３質量％程度向上させることが可能であった。 According to the knowledge of the present inventors, as a result of applying the present invention, the drying trouble in the dryer 4 can be reduced to about 1/5 of the conventional one, and the dry amount and thus the iron production amount in the smelting furnace etc. is improved by about 3% by mass. It was possible.
ただし、本発明はこのような製錬炉、精錬炉又は溶解炉から回収され、製錬炉、精錬炉又は溶解炉で再利用される鉄含有スラリーの脱水処理に適用することができる。 However, the present invention is such smelting furnace is recovered from the smelting furnace or melting furnace, smelting furnace, can be applied to the dehydration treatment of iron-containing slurry over to be reused in smelting furnace or melting furnace.
以下に、実施例、比較例及び実験例を挙げて本発明をより具体的に説明する。 Hereinafter, the present invention will be described more specifically with reference to examples, comparative examples, and experimental examples.
［実施例１］
（重）炭酸塩の脱水性向上効果を確認するために、酸化鉄を主体とするＳＳ濃度５０質量％のシックナー排泥スラリー（ｐＨ：１１．５（２０℃））に、炭酸カリウムの５０質量％水溶液を、炭酸カリウム濃度として５００ｍｇ／Ｌ添加して１０時間混合した後、遠心分離機（巴工業株式会社製「ＤＭＸ型」）で遠心分離処理して濃縮する処理を２ヶ月間継続して行い、このときの脱水機入口スラリーと脱水機出口スラリーのＳＳ濃度をそれぞれ測定し、脱水性向上効果を、脱水前スラリーのＳＳ濃度に対するＳＳ濃度差（＝脱水後のスラリーのＳＳ濃度−脱水前スラリーのＳＳ濃度：この値は大きい程脱水性に優れる。）で調べ、結果を図２に示した。
[Example 1]
In order to confirm the dehydrating effect of (heavy) carbonate, 50 mass of potassium carbonate was added to thickener sludge slurry (pH: 11.5 (20 ° C)) mainly composed of iron oxide and having an SS concentration of 50 mass%. % Aqueous solution was added as a potassium carbonate concentration of 500 mg / L and mixed for 10 hours, followed by centrifugation and concentration with a centrifuge (“DMX type” manufactured by Sakai Kogyo Co., Ltd.) for 2 months. The SS concentration of the dehydrator inlet slurry and the dehydrator outlet slurry at this time was measured, respectively, and the effect of improving the dewaterability was determined by the difference in SS concentration relative to the SS concentration of the slurry before dehydration (= SS concentration of slurry after dehydration−before dehydration SS concentration of slurry: The greater this value, the better the dehydration.) The results are shown in FIG.
［比較例１］
実施例１において、炭酸カリウムを添加せずに脱水を行ったこと以外は同様にして脱水前スラリーのＳＳ濃度に対する脱水性向上効果を調べ、結果を図２に示した。
[Comparative Example 1]
In Example 1, the effect of improving the dehydrating property on the SS concentration of the slurry before dehydration was examined in the same manner except that dehydration was performed without adding potassium carbonate, and the results are shown in FIG.
図２より、炭酸カリウムの添加で鉄含有スラリーの脱水性が向上することが分かる。 From FIG. 2, it can be seen that the addition of potassium carbonate improves the dewaterability of the iron-containing slurry.
［実験例１〜１０］
鉄含有スラリーへの薬剤添加により流動性の向上効果を調べるために、酸化鉄を主体とするＳＳ濃度５０質量％のシックナー排泥スラリー（ｐＨ：１１．５（２０℃））を脱水するに先立ち、該スラリーに、表１に示す各種薬剤を表１に示す添加濃度で添加後、１時間混合し（ただし、実験例４では薬剤無添加）、混合後のスラリーのＡＰＩ規格によるファンネル粘度（５００／５００）を測定した。
[Experimental Examples 1 to 10]
Prior to dehydrating a thickener waste slurry (pH: 11.5 (20 ° C.)) mainly composed of iron oxide and having an SS concentration of 50% by mass in order to investigate the effect of improving fluidity by adding chemicals to the iron-containing slurry. The various chemicals shown in Table 1 were added to the slurry at the addition concentrations shown in Table 1 and mixed for 1 hour (no chemical added in Experimental Example 4), and the funnel viscosity according to the API standard of the slurry after mixing (500 / 500).
ＡＰＩ規格（Ａｍｅｒｉｃａｎ Ｐｅｔｒｏｌｅｕｍ Ｉｎｓｔｉｔｕｔｅ（米国石油協会）による泥水性状の試験規格）によるファンネル粘度（５００／５００）は、ＡＰＩ規格のファンネル粘度計により、スラリーをファンネル容器に入れ、スラリーの全量が流出し終わるまでに要する時間で表され、この値が小さい程粘性が低く、流動性に優れることを示す。 The funnel viscosity (500/500) according to the API standard (muddy water test by American Petroleum Institute (American Petroleum Institute)) is put into the funnel container by the API standard funnel viscometer, and the whole amount of the slurry is discharged. The smaller the value, the lower the viscosity and the better the fluidity.
表１より、（重）炭酸塩であれば、添加後のスラリーの粘性が低く、従って、このスラリーを脱水して得られる濃縮スラリーの粘性も低く、このため、脱水後の濃縮スラリーの流動性の改善効果が得られることが分かる。その結果、乾燥機へのスラリーの付着が減少するため、乾燥機の乾燥効率を向上させることができる。 According to Table 1, in the case of (bi) carbonate, the viscosity of the slurry after addition is low, and therefore, the viscosity of the concentrated slurry obtained by dehydrating this slurry is also low. Therefore, the fluidity of the concentrated slurry after dehydration is low. It can be seen that the improvement effect is obtained. As a result, since the adhesion of the slurry to the dryer is reduced, the drying efficiency of the dryer can be improved.
１ シックナー
２，５ 貯留槽
３ 脱水機
４ 乾燥機
1
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