JP2009183915A - Method of cleaning supercritical sand and sand product - Google Patents

Method of cleaning supercritical sand and sand product Download PDF

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JP2009183915A
JP2009183915A JP2008029047A JP2008029047A JP2009183915A JP 2009183915 A JP2009183915 A JP 2009183915A JP 2008029047 A JP2008029047 A JP 2008029047A JP 2008029047 A JP2008029047 A JP 2008029047A JP 2009183915 A JP2009183915 A JP 2009183915A
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sand
ozone
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Kigaku To
奇岳 湯
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Kigaku To
奇岳 湯
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    • YGENERAL 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
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    • Y02P20/50Improvements relating to the production of products other than chlorine, adipic acid, caprolactam, or chlorodifluoromethane, e.g. bulk or fine chemicals or pharmaceuticals
    • Y02P20/54Improvements relating to the production of products other than chlorine, adipic acid, caprolactam, or chlorodifluoromethane, e.g. bulk or fine chemicals or pharmaceuticals characterised by the solvent
    • Y02P20/544Supercritical solvents, e.g. supercritical H2O or CO2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for efficiently cleaning and removing harmful substances to concrete and reinforcement, such as harmful ions on the surface of sand like chloride and sulfate, organic substances, or algae, and odorless sand for building with low ash content and high quality. <P>SOLUTION: In the cleaning method, harmful ions on the surface of sand are cleaned and removed by supercritical cleaning by overcoming viscosity of the physical property of water and capillary phenomenon caused by surface tension, by cleaning water with mainly gaseous ozone, carbon dioxide gas and liquid water mixed and coexisting therein. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は超臨界砂洗浄方法及び砂製品に関し、特に、海砂、河砂、山砂などの洗浄に利用する超臨界砂洗浄方法、及び建築用砂など高い品質が求められる砂製品に関する。 The present invention relates to supercritical sand cleaning method and sand products, in particular, sea sand, Kawasuna supercritical sand cleaning method used for cleaning, such as mountain sand, and high quality, such as building sand relates sand product sought.

海砂は一般的に河口砂と深海砂があり、河口砂は粒が比較的細かくて、また深海砂は有害イオンのClやSO 4の含有量が比較的高くて、洗浄が難しい。 Sea sand generally has estuary sand and deep sea sand, river mouth sand with grain relatively fine, also deep-sea sand with a relatively high content of Cl and SO 4 harmful ions, difficult cleaning. この種の砂の洗浄方法としては、従来から、(1)浸漬塩素除去法、(2)撒水塩素除去法、(3)自然堆積塩素除去法、(4)機械水車塩素除去法、の4つの手法が知られている。 As a method for cleaning this type of sand, conventionally, (1) Immersion chlorine removal method, (2) watering chlorine removal method, (3) natural deposition chlorine removal method, (4) mechanical water wheel chlorine removal process, four of methods have been known. また、その他の海砂洗浄法が特許文献1などに提案されている。 Also, other sea sand cleaning method has been proposed in Patent Document 1.
特開平10−165837号公報 JP 10-165837 discloses

しかしながら、上記従来の海砂洗浄法では、次のような問題がある。 However, in the conventional sea sand cleaning method has the following problems.
(1)上記(1)−(4)の海砂洗浄法のうち、前三者の洗浄法に共通する欠点は、表1に示すように、品質の安定性がよくない点で、これらの洗浄法による砂製品では高い品質が要求される建築用砂に使用できない。 (1) above (1) - (4) of sea sand cleaning method, drawbacks that are common to the prior tripartite cleaning methods, as shown in Table 1, in terms stability of quality is not good, these can not be used in building sand high quality is required in the sand products according to the washing method. 海砂は海水の中に長期間浸かっているので、海水に浸食されやすく、表面が比較的粗くてひびがあり、普通の水で洗浄する場合、物理的特性、水の密度や粘度により、表面が粗くて又はひびがある海砂は、表面張力が形成しやすく、海砂の表面が潤されにくいため、砂洗浄の品質が安定しないのである。 Since sea sand is immersed long term in sea water, easily eroded seawater, surface are relatively rough cracks, if washing with plain water, the physical properties, the density and viscosity of the water, surface sea ​​sand is rough or cracked surface tension is easily formed, since it is difficult moistened surface of sea sand, the quality of the sand washing is not stable.
(2)上記(4)の機械式塩素除去法は灰分への沈殿が最も進んでおり、この除去法はイギリスのPOWERSCREENが代表的で、POWERSCREENによる海砂洗浄中に高分子フロックを添加して、沈殿汚泥が比較的洗浄しやすいものになっているが、高分子フロックの添加量が少ないときれいに洗浄できず、高分子フロックの添加量が多いと海砂の泥灰が増加する。 (2) the mechanical chlorine removal method of (4) precipitation are most advanced in the ash, the removal method is a British POWERSCREEN is typically by adding a polymer floc during sand washing with POWERSCREEN Although settled sludge is in that relatively easily washed can not be washed clean with a small amount of the polymer flock, the added amount is large and sea sand of marl polymer flocs increases.
(3)上記4つの海砂洗浄法には、経済的で効果の素早いものがなく、しかも、品質が悪い点で共通する。 (3) The above four sea sand cleaning method, quick ones without economical and effective, yet is common that the quality is poor.

本願発明は、このような従来の問題を解決するもので、特に、砂表面の有害イオン、例えば塩化物、硫酸塩、有機物質、藻類等、コンクリート、鉄筋などへの有害物質を効率よく洗浄、除去することのできる超臨界砂洗浄方法、及び臭味がなく、灰分含有量の低い、高品質の建築用砂その他の利用価値の高い砂製品を提供することを目的とする。 The present invention is intended to solve such conventional problems, in particular, harmful ion, such as chloride sand surface, sulfates, organic substances, algae, concrete, efficiently cleaning the harmful substances rebar to such, supercritical sand cleaning method capable of removing, and stink no, low ash content, and to provide a high-quality high sand products of building sand and other utility value of.

上記目的を達成するために、本発明の超臨界砂洗浄方法は、主にオゾン及びPH値7以下の水を混合し、液体と気体の両相が共存する洗浄液を使用することを特徴とし、この洗浄液による超臨界洗浄を、砂中の塩化物、硫酸塩、有機物質、藻類等の除去に使用して、砂等の資源を再利用し、高品質の建築用砂等を提供しようとするものである。 To achieve the above object, supercritical sand cleaning method of the present invention is primarily ozone and PH value 7 or less of water is mixed, characterized in that both phases of liquid and gas is to use a washing liquid coexisting, supercritical cleaning with cleaning liquid, chloride in the sand, sulfates, organic material was used for the removal of algae, reusing resources such as sand, and to provide a high-quality building sand of it is intended. この洗浄方法では、洗浄液は、オゾンをPH値7以下のろ過原生海水の中に導入、混合したことを特徴とする。 In this cleaning method, the cleaning liquid introducing ozone into the PH value 7 following filtration virgin seawater, characterized in that mixed. また、この洗浄方法では、洗浄液は、あらかじめ、淡水に炭酸ガスを投入し、PH値を7以下にして、オゾンの半衰期が長い環境にしたうえ、オゾンを導入し、混合した高濃度のオゾン洗浄液であることを特徴とする。 Further, in this cleaning method, the cleaning liquid in advance, the carbon dioxide gas was introduced into fresh water, and the PH value to 7 or less, after the half 衰期 ozone has a long environment, introducing ozone, high concentration ozone cleaning liquid mixed and characterized in that. さらに、この洗浄方法では、洗浄液のオゾン濃度は5ppmで、洗浄後、発生した微量のオゾン又は塩素、二酸化硫黄は生石灰水塔に導入し、中和、固化させることを特徴とする。 Furthermore, in this cleaning method, an ozone concentration of the cleaning liquid is 5 ppm, after washing, ozone or chlorine generated traces, sulfur dioxide was introduced into the lime water tower, neutralization, characterized in that to solidify.

本発明の特に重要な点は、高濃度のオゾン水を洗浄液として、汚染された砂の資源から有害イオンを除去し、有用な資源にして、洗浄後の砂を高品質の建築用砂にすること、この場合、洗浄水に炭酸ガスを入れ、PH<7にして、更にオゾンを入れて、高濃度オゾン水の洗浄液にすること、また、洗浄液はPH<7の原生海水を高濃度の相洗浄液にすること、にある。 A particularly important aspect of the present invention, a high concentration of ozone water as a cleaning liquid to remove harmful ions from contaminated sand resources, and useful resources, the sand washed high quality building sand it, in this case, putting the carbon dioxide into the washing water, in the PH <7, further put ozone, it is the cleaning liquid of the high concentration ozone water, also, the cleaning liquid PH <7 virgin seawater high concentration phase It is in the cleaning solution, in the. すなわち、この発明は、気体のオゾン及び液体の水が混合、共存した洗浄水により、オゾンの特性を生かして、砂の表面を洗浄するもので、この場合、洗浄液は貯水槽で水(原生海水又は淡水)の中にO 3を入れることで、液体と気体の両相が共存する洗浄液にし、あらかじめ、水の中に炭酸ガスを入れ、PH<7にしてから更にオゾンを入れることで(酸性環境の中でオゾンの半衰期が長いことを利用して)、高濃度のオゾン水を形成する。 That is, the present invention is mixing ozone and water liquid gas, the washing water coexist, taking advantage of the properties of ozone, by washing the surface of the sand, this case, the cleaning liquid is water reservoir (native seawater or fresh) by putting O 3 in, and the cleaning liquid both phases of liquid and gas coexist, in advance, putting carbon dioxide into the water, by placing the further ozone after the PH <7 (acidic by utilizing the longer semi 衰期 ozone in the environment), forming a high-concentration ozone water. 海砂は海水の中に長期間浸かるため、海水に浸食されやすく、表面が比較的粗く、ひびがあり、一般の海水は、塩化ナトリウム2.7%、塩化マグネシウム0.32%、塩化カルシウム0.05%、硫酸マグネシウム0.22%、硫酸カルシウム0.11%、幾らかの微生物、有機物及び水溶性無機物等のイオンが含まれるため、海砂の表面の粘度が相当に高くて、雑質などを落とすのが難しい。 Sea sand because soak long term in sea water, easily eroded seawater, surface is relatively rough, Hibigaari, general sea water, sodium chloride 2.7%, magnesium chloride 0.32%, calcium chloride 0 .05%, 0.22% magnesium sulfate, 0.11% calcium sulfate, because it contains some microorganisms, ions such as organic matter and water-soluble inorganic substance with considerably high viscosity of the surface of the sea sand, contaminated with impurities it is difficult to drop the like. このような海砂を普通の水で洗浄しようとすると、物理的特性、水の密度や粘度により、(表面が粗くて又はひびがある)海砂は、表面張力が形成しやすく、海砂の表面が潤されにくくなり、砂洗浄の品質が安定しないが、この発明では、水にオゾンを添加し、オゾンの特性を生かして、砂の表面を洗浄する。 If you try to wash such sea sand with plain water, the physical properties, the density and viscosity of the water, (surface is roughened or cracked) sea sand surface tension is easily formed, the sea sand surface is hardly moistened, but the quality of the sand washing is not stable, in this invention, the addition of ozone to the water, taking advantage of the properties of ozone, cleaning the surface of the sand. すなわち、主に水の中に気体のオゾンを入れることで、水の粘度を低減し、水の表面張力を克服し、微々たる凸凹のある表面に対して、超臨界洗浄を発揮し、有害イオンを洗浄、除去する。 That is, by mainly put ozone gas in water to reduce the viscosity of the water to overcome the surface tension of water, relative to the surface with insignificant irregularities, exhibits supercritical cleaning, harmful ions washed to remove. なお、超臨界とは、水の物理的特性の臨界点をクリアすることを指す。 Note that the supercritical refers to clear the critical points of the physical properties of water.

そして、本発明の砂製品は、上記の洗浄方法により洗浄され、得られた高品質の砂であることを特徴とする。 Then, the sand products of the present invention is cleaned by the cleaning method characterized in that it is a high-quality sand obtained. そして、この場合に採用される砂は、海砂、河砂、山砂である。 Then, sand to be adopted in this case, sea sand, Kawasuna, is a mountain sand.

本発明の超臨界砂洗浄方法による砂の洗浄には、次のような効果がある。 For washing sand with supercritical sand cleaning method of the present invention, the following effects.
(1)本発明の超臨界砂洗浄方法では、オゾンにより、液体と気体の両相が共存する洗浄水にして、水だけが存在する時の物理的特性を克服し、水の粘度を低減し、水の表面張力及び毛細現象を克服し、超臨界洗浄効果を発揮して、砂表面の有害イオンを洗浄、除去することができる。 (1) a supercritical sand cleaning method of the present invention, the ozone in the washing water both phases of liquid and gas coexist, overcomes the physical characteristics of when only water is present to reduce the viscosity of water to overcome the surface tension and capillary action of the water, exerts a supercritical cleaning effect, the harmful ions sand surface cleaning can be removed.
(2)本発明の超臨界砂洗浄方法では、オゾンにより、飽和有機物又は不飽和有機物との化学作用が素早く行われるようになり、海砂又は河砂の表面にある微生物、有機物、藻類等を除去することができる。 (2) in supercritical sand cleaning method of the present invention, by ozone, it is as chemistry and saturated organic or unsaturated organic substances takes place quickly, the microorganisms on the surface of the sea sand or Kawasuna, organics, algae, etc. it can be removed.
(3)本発明の超臨界砂洗浄方法では、オゾンは水の中に溶けて水中の酸素含有量を向上させ、水のイオン導電度を高めるもので、砂の中に多くの絶縁体であるSIO 2が含まれているため、イオン導電度は静電気発生を防止し、微粉末の付着が避けられるので、洗浄後の粒を選択しやすくすることができる。 (3) in supercritical sand cleaning method of the present invention, ozone is dissolved in water to improve the oxygen content in the water, which enhance the ionic conductivity of the water, in many insulator in the sand since SIO 2 is contained, ionic conductivity prevents the generation of static electricity, the adhesion of the fine powder can be avoided, it is possible to easily select the grain after washing.
(4)本発明の超臨界砂洗浄方法では、オゾンにより、三つめの塩素原子が溢れ出て、大量の熱エネルギーが放出され、これと同時に音波が発生するため、砂表面の小さな窪みや穴にある有害イオンを出して、洗浄後の砂をよりきれいにすることができる。 (4) Supercritical sand cleaning method of the present invention, by ozone, overflows chlorine atoms item three goes, a large amount of heat energy is released, this because the sound waves are generated at the same time, a small recess or hole in the sand surface it can issue a harmful ions, the sand after washing cleaner in.
(5)本発明の超臨界砂洗浄方法では、オゾンはガス原料であり、コロナ放電が発生するため、コストが低く、量産可能なメリットがある。 (5) a supercritical sand cleaning method of the present invention, ozone is a gas feed, since the corona discharge is generated, cost is low, there is a mass-producible benefits.
(6)本発明の超臨界砂洗浄方法では、あらかじめ炭酸を洗浄液に添加し、PH<7にしてから、その中にオゾンを入れ、洗浄液のオゾン液を素早く高濃度のオゾン水溶液にするので、洗浄後の砂をよりきれいにすることができる。 The supercritical sand cleaning method (6) The present invention, by adding pre-carbonate to the wash after the PH <7, put ozone therein, since the ozone aqueous solution quickly high concentration ozone solution of the cleaning liquid, it is possible to sand after washing more beautiful.
(7)本発明の超臨界砂洗浄方法では、有害イオンを除去するための砂洗浄中に大量のO 3又はCl、SO 2が発生するが、生石灰水塔による中和固化、又はオゾンによる塔内余分のO 3への除去により二次汚染が生じる恐れがない。 (7) In the supercritical sand cleaning method of the present invention, harmful ions massive O 3 or in the sand washing to remove Cl, but SO 2 occurs, neutralization solidified by lime water tower, or ozone by the tower there is no risk of secondary contamination caused by the removal of the excess O 3.

また、本発明の砂製品によれば、次のような効果を有する。 Further, according to the sand product of the present invention has the following effects.
(8)本発明の砂製品は、有害イオンが除去されて、高品質で、利用価値が高く、また生産性が高く、コストが低いという利点があり、建築用砂として使用することができる。 (8) sand the product of the present invention, harmful ions are removed, a high-quality, high utility value, also has high productivity, cost has the advantage that low, can be used as building sand.

以下、本発明の実施の形態について説明する。 The following describes embodiments of the present invention. まず、図1を用いて、第1の実施の形態について説明する。 First, with reference to FIG. 1, a description will be given of a first embodiment. なお、この実施に形態では、海辺で取れた海砂を使って砂の洗浄方法を説明するが、本発明(特許請求の範囲)はこの海砂に制限されるものではない。 In the embodiment in this embodiment, but with the sea sand came off the beach illustrating a method of cleaning sand, (claims) The present invention is not limited to this sea sand.

この超臨界砂洗浄方法では、次の(1)〜(8)のステップにより、海砂を洗浄する。 This supercritical sand washing method, the steps of the following (1) to (8), washed sea sand.
(1)汚物、染物ろ過済みの原生海水103(PH<7)を用い、オゾン生成装置102でオゾンを作り、海水にオゾンを15分程投入し、オゾン濃度を5ppmにする。 (1) dirt, using a dyeing filtered virgin seawater 103 (PH <7), creating ozone in the ozone generation device 102, the ozone in seawater was placed about 15 minutes, the ozone concentration in 5 ppm. 余分なオゾンはオゾン遮断器109内へ導入し、オゾン遮断器109内の酸化マンガンと中和し、遮断する。 Extra ozone is introduced into the ozone breaker 109, and neutralized with manganese oxide in the ozone breaker 109, to cut off.
(2)きれいな淡水104にオゾンを15分程投入し、オゾン濃度を5ppmにする。 (2) Ozone was introduced about 15 minutes to clean fresh water 104, the ozone concentration in 5 ppm. 余分なオゾンはオゾン遮断器109内に導入し、オゾン遮断器109内の酸化マンガンと中和し、遮断する。 Extra ozone is introduced into the ozone breaker 109, and neutralized with manganese oxide in the ozone breaker 109, to cut off.
(3)海砂101を自然に乾燥して、原生海水の含有量を低減する。 (3) sea sand 101 by naturally drying, to reduce the content of native seawater.
(4)海砂101を洗浄槽105に入れる。 (4) sea sand 101 is placed in a cleaning tank 105.
(5)ステップ(1)のオゾン水を洗浄槽105に導入し、水位が洗浄槽105の約1/3のところに達したところで、オゾン水の導入速度を遅くする。 (5) the ozone water in step (1) was introduced into the cleaning tank 105, where the water level has reached at about one-third of the cleaning tank 105, slows the rate of introduction of ozone water.
(6)洗浄槽105を起動し、洗浄槽105を一分間に12回転の速度で回転する。 (6) Start cleaning tank 105, washing tank 105 rotates at a speed of 12 revolutions per minute. 砂をゆっくり洗浄しながら次のステップへ送る。 While washing the sand slowly send to the next step. 海砂が洗浄槽105へ入ってから出るまでの滞在時間は5分ほどで、この間、排気ファンを起動し、発生された微量のO 3或いはCl、SO 2は生石灰水塔200を通して中和、固化する。 Sand stay time to exit the entering into the cleaning tank 105 as much as 5 minutes, during which to start the exhaust fan, O 3 or Cl of the generated trace, SO 2 is neutralized through lime water tower 200, solidification to.
(7) 洗浄槽105から送り出された海砂101をフィルター付きの水ろ過ベルトコンベヤー106で運搬する。 (7) sea sand 101 fed from the cleaning tank 105 is transported with water filtration belt conveyor 106 with filter. このベルトコンベヤー106にオゾン水をスプレーするためのシャワーヘッド108が三つあり、海砂101を、ステップ(2)のオゾン水で再度洗浄し、その表面に残された有害イオンを除去する。 The shower head 108 for spraying the ozone water on the belt conveyor 106 is located three, sea sand 101, again washed with ozone water in step (2), removing harmful ions left on the surface. このようにして海砂101を完成品堆積区107まで運ぶ。 In this way, the carrying sea sand 101 to finished products deposited District 107.
(8)完成品堆積区107に海砂を静置し、ここで余分な水分を流す。 (8) was allowed to stand sea sand to the finished product deposition District 107, passed through here in the excess water.

以上のステップ(1)〜(8)により洗浄された海砂101を、純水で沸騰し、ろ過し、更に、硝酸銀で抽出して、実験した結果、塩素イオンの含有量は、表2に示すように、約0.0019%となった。 Sea sand 101 that has been cleaned by the above steps (1) to (8), boiled with pure water, filtered and further extracted with silver nitrate, the experimental result, the content of chloride ions, in Table 2 as shown, was about 0.0019 percent. 海砂は、前出の表1に示すように、塩素イオンの含有量が0.2219%であるが、この超臨界砂洗浄方法により、塩素イオンの含有量が約0.0019%となり、建築用砂の品質基準に適合する砂製品となった。 Sea sand, as shown in Table 1, supra, but the content of chlorine ions is 0.2219%, by supercritical sand cleaning method, next to the content of chlorine ions is about 0.0019%, architectural It was compatible with sand products to the quality standards of use sand.

また、原砂とこの洗浄後の海砂(砂製品)とは外観が次の点で明らかに異なる。 Further, appearance and sea sand (sand product) after the washing with the original sand clearly different in terms of the following.
(A)一般の海砂は異臭があるが、この超臨界砂洗浄方法による海砂は無臭である。 (A) is generally of sea sand may odor, sea sand by supercritical sand cleaning method is odorless.
(B)一般の海砂は表面の粘度が高くて手に付き易いが、この超臨界砂洗浄方法による海砂は粒がきれいに輝いている。 (B) General sea sand is easily attached to hands high viscosity of the surface, sea sand by supercritical sand cleaning method grain is clean shine.
(C)一般の海砂は表面の灰分含有量が高いが、この超臨界砂洗浄方法による海砂は表面に灰分がない。 Although (C) common sea sand has a high ash content of the surface, sea sand has no ash on the surface by the supercritical sand cleaning method.

以上の結果から、オゾン水を海砂、河砂、山砂の洗浄に使用した場合、オゾンの特性である(1)酸化作用、(2)殺菌作用、(3)除臭作用、(4)漂白作用、(5)熱エネルギー提供の特性を発揮することが分かる。 From the above results, sea sand ozone water, Kawasuna, when used for cleaning pit sand, which is characteristic of ozone (1) oxidation, (2) fungicidal action, (3) odor removal effect, (4) bleaching action, it can be seen that exhibit (5) thermal energy provided characteristics. また、もう一つ重要な物理的特性であるが、オゾンイオンがやや水に溶けてから、水の粘度が低減され、水の毛細現象が破壊され、超臨界洗浄を発揮するので、表面に微小たる凸凹がある荒い海砂を洗浄すると、洗浄後の海砂は粒がきれいに輝き、灰分含有量を低く下げ、有害イオンを簡単に除去することができる。 Also, small but is another important physical properties, the melt slightly water ozone ions, the viscosity of the water is reduced, capillarity of water is broken, so to exert a supercritical cleaning, the surface When unevenness is washed rough sea sand with upcoming, sea sand after cleaning particle shines clean, the ash content lower low, it is possible to easily remove harmful ions.
海砂は既述のとおり、河口砂と深海砂があり、河口砂は粒が比較的細く、深海砂は有害イオンのClやSO 4の含有量が比較的高くて、洗浄が難しく、また、近隣の海辺で淡水を入手するのは困難であるが、この超臨界砂洗浄方法では、原生海水による洗浄であり、淡水の使用量は一般洗浄法の使用量の1/5ですみ、省エネルギー効果によりコストダウンを図ることができ、砂の大量洗浄が可能である。 Sea sand is as described above, there is a mouth sand and deep sea sand, river mouth sand grains are relatively thin, deep sea sand with a relatively high content of Cl and SO 4 harmful ions, cleaning is difficult, also, Although it is difficult to obtain fresh water in the neighboring seaside, in this supercritical sand cleaning method, a cleaning with virgin seawater, the amount of fresh water requires only 1/5 of the amount of general washing method, energy savings it is possible to reduce the cost by, enables mass washed sand.

以上説明したように、この超臨界砂洗浄方法では、主に気体のオゾン、炭酸ガス及び液体の水が混合、共存した洗浄水で洗浄するので、水の物理的特性の粘度、表面張力からの毛細現象を克服し、超臨界洗浄で砂表面の有害イオン、例えば塩化物、硫酸塩、有機物質、藻類等、コンクリート、鉄筋などへの有害物質を効率よく除去することができる。 As described above, in this supercritical sand cleaning method mainly ozone gas, water mixing of carbon dioxide and liquid, the washing with the wash water coexist, the viscosity of the physical properties of water, from the surface tension overcome capillary action, harmful ion, such as chloride sand surface supercritical cleaning, it can be efficiently removed harmful substances sulfates, organic substances, algae, concrete, rebar the like. オゾンは強力な酸化剤であり、有機物質への分解作用があるため、洗浄水として使われる高濃度のオゾン水は、砂の有害イオンを効率よく除去して、有害物質が残らない。 Ozone is a strong oxidant, because of the decomposition of the organic material, a high concentration of ozone water to be used as wash water, the harmful ions sand was efficiently removed, leaving no hazardous substances. 洗浄後の砂は臭味がなく、灰分含有量が低く、高品質の建築用砂として提供することができる。 Sand after washing has no stink, low ash content, can be provided as a high-quality building sand.

次に、図2を用いて、第2の実施の形態について説明する。 Next, with reference to FIG. 2, a description will be given of a second embodiment. なお、この実施に形態では、河砂を使って砂の洗浄方法を説明するが、本発明(特許請求の範囲)はこの河砂に制限されるものではない。 In the embodiment in this embodiment, but with the river sand explaining a method of cleaning sand, (claims) The present invention is not limited to this river sand.

この超臨界砂洗浄方法では、次の(1)〜(8)のステップにより、河砂を洗浄する。 This supercritical sand washing method, the steps of the following (1) to (8), washing the river sand. (1)きれいな淡水204に炭酸ガス202を投入し、水中のPH値を5にする。 (1) Clean fresh water 204 of carbon dioxide gas 202 is introduced into, the PH value of water to 5.
(2)オゾン生成装置203を起動し、オゾンを製造して、水の中にオゾンを15分程投入し、オゾン濃度を5ppmにする。 (2) Start the ozone generator 203, to produce the ozone, ozone was charged about 15 minutes in water, the ozone concentration in 5 ppm. 余分なオゾンはオゾン遮断器209内に導入し、オゾン遮断器209内の酸化マンガンと中和し、遮断する。 Extra ozone is introduced into the ozone breaker 209, and neutralized with manganese oxide in the ozone breaker 209, to cut off.
(3)河砂201を自然に乾燥し、原生河川の雑質の含有量を低減する。 (3) Kawasuna 201 was naturally dried, to reduce the content of coarse quality virgin river.
(4)河砂201を洗浄槽206に入れる。 (4) Kawasuna 201 is placed in a cleaning tank 206.
(5)ステップ(1)のオゾン水を洗浄槽206に導入し、水位が洗浄槽206の約1/3のところに達したところで、オゾン水の導入速度を遅くする。 (5) the ozone water in step (1) was introduced into the cleaning tank 206, where the water level has reached at about one-third of the cleaning tank 206, slows the rate of introduction of ozone water.
(6)洗浄槽206を起動し、洗浄槽206を一分間に12回転の速度で回転する。 (6) Start cleaning tank 206, washing tank 206 rotates at a speed of 12 revolutions per minute. 砂をゆっくり洗浄しながら次のステップへ送る。 While washing the sand slowly send to the next step. 河砂201が洗浄槽206へ入ってから出るまでの滞在時間は5分程で、この間、排気ファンを起動し、発生された微量のO 3又はCl, SO 2は生石灰水塔300を通して中和、固化する。 Residence time to Kawasuna 201 exits enters into the wash tank 206 is at about 5 minutes, during which to start the exhaust fan, O 3 or Cl of the generated trace, SO 2 is neutralized through lime water tower 300, It solidified.
(7)洗浄槽206から送り出された河砂201をフィルター付きの水ろ過ベルトコンベヤー207で運搬する。 (7) a Kawasuna 201 fed from the cleaning tank 206 is transported with water filtration belt conveyor 207 with filter. このベルトコンベヤー207にオゾン水をスプレーするためのシャワーヘッド206が三つあり、河砂201を、ステップ(1)のオゾン水で再度洗浄し、その表面に残された有害イオンを除去する。 The shower head 206 for spraying the ozone water on the belt conveyor 207 is located three, the Kawasuna 201, again washed with ozone water in step (1), removing harmful ions left on the surface. このようにして河砂201を完成品堆積区208まで運ぶ。 In this way, the carry river sand 201 to finished products deposited District 208.
(8)完成品堆積区208に河砂を静置し、ここで余分な水分を流す。 (8) was allowed to stand Kawasuna to finished product deposition District 208, passed through here in the excess water.

河砂は入手しやすくて、海砂のようにClやSO 4等の有害イオンがないが、工業、家庭の廃水、水質富栄養化により、藻類や青苔の汚染が発生し、品質を重要視する建築用砂にも次のようなある程度のマイナスの影響を及ぼすことになり、これに対応する適当な措置を講じる必要がある。 Kawasuna is readily available, but there is no detrimental ions 4 such as Cl or SO as sea sand, industrial, domestic wastewater, water quality eutrophication, contamination of algae or blue moss occurs, important quality even building sand that will affect to some extent the negative, such as the following, this is necessary appropriate measures that correspond.
(1)河砂は表面に藻類や青苔の有機物があると、表面の粘度が高く、微粉末が付着しやすくなり、コンクリートとの混合割合が計算しにくくなって、コンクリートの品質にマイナスな影響を及ぼす。 (1) When Kawasuna are organic substances of algae or blue moss on the surface, high viscosity of the surface, a fine powder is easily deposited, the mixing ratio of the concrete becomes difficult calculation, negative impact on the quality of the concrete the on.
(2)河砂は表面に酸性物質が存在すると、コンクリートと混合するときに、酸とアルカリの中和が生じて、コンクリートに鉄筋を保護するための機能が失われる。 (2) When Kawasuna is present acidic substances on the surface, when mixed with concrete, the neutralization of acid and alkali generated, features to protect the reinforcing steel is lost concrete.
(3)河砂は表面に洗剤などの物質があると、コンクリートと混合するときに、コンクリートの硬化時間が短縮し、耐圧、抗引張り強度に影響を及ぼす。 (3) Kawasuna is when there is material such as the detergent on the surface, when mixed with concrete, shortening the curing time of the concrete, the breakdown voltage, influences the anti-tensile strength.
この超臨界砂洗浄方法はオゾンの機能を導入するもので、以上の問題点を解決すると同時に、自然に砂から消えていくというメリットがある。 The supercritical sand cleaning method intended to introduce the functions of the ozone, and at the same time to solve the above problems, there is a merit that disappear from the naturally sand. なお、上述の超臨界とは、水の物理的特性の臨界点をクリアすることを指し、水は一定の密度と粘度があり、洗浄に使われるときに、微小な隙間に毛細現象が発生して、微小な隙間の洗浄能力が失われ、臨界点もアスペクト比に影響を及ぼす。 Note that the above-mentioned supercritical refers to clear the critical points of the physical properties of the water, the water has a constant density and viscosity, when used for cleaning, KeHoso phenomenon occurs in a small gap Te, is lost minute space cleaning performance, even critical point affects the aspect ratio. すなわち、縦が横より二倍以上になると、水の密度及び粘度の臨界点により、深い底のところをきれいに洗浄できないため、この洗浄方法はガスを導入し、三相の中で密度の最も低いガス(約液体の千分の一)は粘度が最も低く、水の臨界点をクリアし、上述の問題点を解決し、臨界点をクリアする。 That is, when the vertical is more than double than the lateral, the critical point of the density and viscosity of water, deep bottom can not be washed clean the place, this cleaning method the gas is introduced, the lowest density in the three-phase gas (about one thousandth of the liquid) has the lowest viscosity, critical point of water was clear, to solve the problems described above, to clear the critical points.

以上説明したように、この超臨界砂洗浄方法によれば、主に気体のオゾン、炭酸ガス及び液体の水が混合、共存した洗浄水で洗浄するので、水の物理的特性の粘度、表面張力からの毛細現象を克服し、超臨界洗浄で砂表面の有害イオン、例えば塩化物、硫酸塩、有機物質、藻類等、コンクリート、鉄筋などへの有害物質を効率よく除去することができる。 As described above, according to the supercritical sand cleaning method, mainly of gaseous ozone, water mixing of carbon dioxide and liquid, the washing with the wash water coexist, the viscosity of the physical properties of the water, the surface tension overcome capillary action from harmful ion, such as chloride sand surface supercritical cleaning, it can be efficiently removed harmful substances sulfates, organic substances, algae, concrete, rebar the like. オゾンは強力な酸化剤であり、有機物質への分解作用があるため、洗浄水として使われる高濃度のオゾン水は、砂の有害イオンを効率よく除去して、有害物質が残らない。 Ozone is a strong oxidant, because of the decomposition of the organic material, a high concentration of ozone water to be used as wash water, the harmful ions sand was efficiently removed, leaving no hazardous substances. 洗浄後の砂は臭味がなく、灰分含有量が低く、高品質の建築用砂として提供することができる。 Sand after washing has no stink, low ash content, can be provided as a high-quality building sand.

本発明の第1の実施の形態における長臨界砂洗浄方法を示す流れ図 Flow diagram showing a long critical sand cleaning method according to the first embodiment of the present invention 本発明の第2の実施の形態における長臨界砂洗浄方法を示す流れ図 Flow diagram showing a long critical sand cleaning method in the second embodiment of the present invention

符号の説明 DESCRIPTION OF SYMBOLS

101 海砂 102 オゾン生成装置 103 海水 104 淡水 105 洗浄槽 106 水ろ過ベルトコンベヤー 107 完成品堆積区/完成品砂 108 シャワーヘッド 109 オゾン遮断器 200 中和塔 201 河砂 202 炭酸ガス 203 オゾン生成装置 204 淡水 205 洗浄槽 206 シャワーヘッド 207 水ろ過ベルトコンベヤー 208 完成品堆積区/完成品砂 209 オゾン遮断器 300 中和塔 101 sand 102 ozone generator 103 seawater 104 fresh 105 cleaning tank 106 water filtration belt conveyor 107 Completed deposited ku / PVC sand 108 showerhead 109 ozone breaker 200 neutralization tower 201 Kawasuna 202 CO 203 ozone generator 204 freshwater 205 cleaning tank 206 showerhead 207 water filtration belt conveyor 208 completed deposited ku / PVC sand 209 ozone breaker 300 neutralization tower

Claims (6)

  1. 主にオゾン及びPH値7以下の水を混合し、液体と気体が共存する洗浄液を使用することを特徴とする超臨界砂洗浄方法。 Mainly mixed ozone and PH value 7 or less of water, a supercritical sand cleaning method characterized by liquid and gas is used a cleaning solution to coexist.
  2. 前記洗浄液はオゾンをPH値7以下のろ過原生海水の中に導入し、混合したものである請求項1に記載の超臨界砂洗浄方法。 The washing liquid is introduced into the ozone into the PH value 7 following filtration virgin seawater, supercritical sand cleaning method according to claim 1 is a mixture.
  3. 前記洗浄液はあらかじめ、淡水に炭酸ガスを投入しPH値を7以下にして、オゾンの半衰期が長い環境にしたうえで、オゾンを導入し、混合した高濃度のオゾン洗浄液である請求項1に記載の超臨界砂洗浄方法。 The cleaning solution in advance, fresh water was introduced carbon dioxide to the PH value to 7 or less, in terms of half 衰期 ozone has a long environment, introducing ozone, according to claim 1 which is a high concentration of ozone cleaning liquid mixed supercritical sand cleaning method.
  4. 前記洗浄液のオゾン濃度を5ppmにして、洗浄後、発生した微量のオゾン又は塩素、二酸化硫黄を生石灰水塔に導入し、中和、固化する請求項1乃至請求項3のいずれかに記載の超臨界砂洗浄方法。 And the ozone concentration of the cleaning solution to 5 ppm, after washing, ozone or chlorine generated traces, sulfur dioxide was introduced into the lime water tower, neutralization, supercritical according to any one of claims 1 to 3 solidifies sand cleaning method.
  5. 砂が請求項1乃至請求項4のいずれかに記載の超臨界砂洗浄方法により洗浄されて得られたことを特徴とする砂製品。 Sand product characterized in that sand is obtained is washed with supercritical sand cleaning method according to any one of claims 1 to 4.
  6. 前記砂は、海砂、河砂、山砂である請求項5に記載の砂製品。 The sand, sand product according sea sand, Kawasuna, to claim 5 which is a mountain sand.
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JPS6233563A (en) * 1985-08-08 1987-02-13 Tsukishima Kikai Co Ltd Cleaning method for contaminated grit containing waste
JPS6233564A (en) * 1985-08-08 1987-02-13 Tsukishima Kikai Co Ltd Method and apparatus for treating contaminated grit
JPH0796295A (en) * 1993-09-27 1995-04-11 Jiro Sasaoka Method and apparatus for treating suspension or mud
JP2004107789A (en) * 2002-05-20 2004-04-08 Matsushita Electric Ind Co Ltd Cleaning method with pressurized fluid
JP2005081302A (en) * 2003-09-10 2005-03-31 Japan Organo Co Ltd Washing method and washing device of electronic component members by supercritical fluid
JP2007515780A (en) * 2003-05-06 2007-06-14 アドバンスド テクノロジー マテリアルズ,インコーポレイテッド Supercritical fluid-based cleaning compositions and methods

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JPS6233563A (en) * 1985-08-08 1987-02-13 Tsukishima Kikai Co Ltd Cleaning method for contaminated grit containing waste
JPS6233564A (en) * 1985-08-08 1987-02-13 Tsukishima Kikai Co Ltd Method and apparatus for treating contaminated grit
JPH0796295A (en) * 1993-09-27 1995-04-11 Jiro Sasaoka Method and apparatus for treating suspension or mud
JP2004107789A (en) * 2002-05-20 2004-04-08 Matsushita Electric Ind Co Ltd Cleaning method with pressurized fluid
JP2007515780A (en) * 2003-05-06 2007-06-14 アドバンスド テクノロジー マテリアルズ,インコーポレイテッド Supercritical fluid-based cleaning compositions and methods
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