JP2013203525A - Dusting and/or moisture rise preventing method for open-air deposit - Google Patents
Dusting and/or moisture rise preventing method for open-air deposit Download PDFInfo
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- JP2013203525A JP2013203525A JP2012074339A JP2012074339A JP2013203525A JP 2013203525 A JP2013203525 A JP 2013203525A JP 2012074339 A JP2012074339 A JP 2012074339A JP 2012074339 A JP2012074339 A JP 2012074339A JP 2013203525 A JP2013203525 A JP 2013203525A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010410 dusting Methods 0.000 title abstract 4
- 239000002245 particle Substances 0.000 claims abstract description 39
- 239000000839 emulsion Substances 0.000 claims abstract description 38
- 229920005989 resin Polymers 0.000 claims abstract description 38
- 239000011347 resin Substances 0.000 claims abstract description 38
- 229920000642 polymer Polymers 0.000 claims abstract description 13
- 239000003245 coal Substances 0.000 claims description 33
- 239000000428 dust Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 230000002265 prevention Effects 0.000 claims description 6
- 229920006243 acrylic copolymer Polymers 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 15
- 239000011248 coating agent Substances 0.000 abstract description 14
- 238000005336 cracking Methods 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 37
- 239000000243 solution Substances 0.000 description 21
- 238000009826 distribution Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000013049 sediment Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000003610 charcoal Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- -1 ore Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
Description
本発明は野積み堆積物に、エマルジョン樹脂溶液を散布してコーティング膜を形成することにより、野積み堆積物の粉塵発生や水分上昇を防止する方法に関する。 The present invention relates to a method for preventing generation of dust and an increase in water content by spreading an emulsion resin solution on a field deposit to form a coating film.
製鉄所や発電所、紙パルプ工場などでは、石炭、鉄鉱石、スラグ、ダストなどの粉体を野積みしている。野積みされた粉体からは粉塵が発生し、環境問題となる。また、豪雨等により山崩れ、流炭（石炭の含水率が上がりスラリー状となることで野積み石炭から流れ崩れる現象）などが発生する。また、降雨等により雨水が浸透し、含水率が上昇する。野積み石炭の含水率の上昇は、燃料として使用する際に水分蒸発のために余分のエネルギーを消費させ、経済的に大きな損失を招くと共にＣＯ２発生量の増加につながる上に、原料炭の場合はコークス製造工程において種々の悪影響を及ぼす。 Steelworks, power plants, pulp and paper mills, etc., pile up powders such as coal, iron ore, slag, and dust. Dust is generated from the piled powder, which is an environmental problem. In addition, landslides caused by heavy rains, etc., and coal flow (a phenomenon in which the moisture content of coal increases and becomes a slurry to cause flow collapse from field coal) occur. Moreover, rainwater permeates due to rainfall and the like, and the water content increases. An increase in the moisture content of open-stack coal consumes extra energy to evaporate moisture when used as fuel, resulting in a large economic loss and an increase in CO 2 generation. In some cases, the coke production process has various adverse effects.
この問題に対して、エマルジョン樹脂の希釈液を、野積み堆積物の表層に散布して、野積み堆積物の粉体とエマルジョン樹脂の固結体を形成させて粉塵の発生や水分の上昇を防止する方法が知られており、従来、野積み堆積物のコーティング処理としていくつかの提案がなされている。 In response to this problem, the emulsion resin dilution is sprayed on the surface of the piled deposit to form a solidified body of the piled deposit powder and the emulsion resin to reduce the generation of dust and moisture. Methods for preventing this are known, and some proposals have been made as coating processes for field deposits.
例えば、特許文献１には、野積み堆積物の疎水化処理剤として、アクリル系樹脂のエマルジョンを用いることが開示されているが、この疎水化処理剤では膜厚が薄くなりやすいため、膜にひび割れが生じ、雨水等が浸透してしまう問題がある。
また、特許文献２では、エチレン−酢酸ビニル系共重合体エマルジョンに撥水剤を含有させて遮水性を発揮させる処理法が開示されているが、この技術では野積み堆積物表面に緻密な膜を形成し難いため、水分が浸透する問題がある。
更に、特許文献３には、樹脂エマルジョン１００重量部に対し撥水性付与剤を３〜１５重量部含有させた野積み石炭の含水率上昇抑制剤が開示されているが、このものは、経済性や造膜性の点で問題がある。
For example, Patent Document 1 discloses that an acrylic resin emulsion is used as a hydrophobizing agent for piled deposits. However, since this hydrophobizing agent tends to reduce the film thickness, There is a problem that cracks occur and rainwater penetrates.
Further, Patent Document 2 discloses a treatment method in which a water-repellent agent is contained in an ethylene-vinyl acetate copolymer emulsion to exert a water-blocking property. Since it is difficult to form, there is a problem that moisture penetrates.
Furthermore, Patent Document 3 discloses a water content increase inhibitor for field coal in which 3 to 15 parts by weight of a water repellency imparting agent is contained with respect to 100 parts by weight of a resin emulsion. There is also a problem in terms of film forming properties.
このように樹脂エマルジョンを用いてコーティングを行う場合、野積み堆積物に対して薄い膜しか形成し得ないと、膜に亀裂が入り粉塵が発生したり、雨水が浸透し、石炭などの野積み粉体の水分を上昇させたりする等の問題を引き起こす。 When coating with a resin emulsion in this way, if only a thin film can be formed on the field deposit, cracks will occur in the film, dust will be generated, rainwater will penetrate, This causes problems such as increasing the moisture content of the powder.
上述のように、従来法では、雨水などが浸透しないように、野積み堆積物の表層にコーティング膜を形成させようとすると、膜が薄くなり、亀裂が入り易く、雨水が浸透し易く、また、粉塵も発生し易くなる。また、雨水が浸透すると、野積み粉体がスラリー化して流炭などの現象を引き起こす。 As described above, in the conventional method, if a coating film is formed on the surface layer of the piled sediment so that rainwater or the like does not penetrate, the film becomes thin, easily cracked, and rainwater easily penetrates. Dust is also easily generated. Moreover, when rainwater permeates, the piled powder becomes a slurry and causes a phenomenon such as charcoal.
本発明は上記従来の問題点を解決し、野積み堆積物にエマルジョン樹脂溶液を散布してコーティング膜を形成して野積み堆積物の粉塵発生ないしは水分上昇を防止する方法において、膜厚が厚く、高強度で亀裂が入り難いコーティング膜を形成して、野積み堆積物の粉塵の発生ないしは水分上昇を確実に防止する方法を提供することを課題とする。 The present invention solves the above-mentioned conventional problems, and in the method for preventing the generation of dust or the increase of moisture in a field deposit by spraying an emulsion resin solution on the field deposit to form a coating film, the film thickness is increased. It is an object of the present invention to provide a method for reliably preventing generation of dust or moisture increase in a piled deposit by forming a coating film having high strength and hardly cracking.
本発明者は、上記課題を解決すべく鋭意検討を重ねた結果、ポリマー粒子の粒子径が大きく、粒子径分布に広がりをもったエマルジョン樹脂溶液を用いることにより、上記課題を解決することができることを見出した。 As a result of intensive studies to solve the above-mentioned problems, the present inventor can solve the above-mentioned problems by using an emulsion resin solution having a large particle size and a wide particle size distribution. I found.
本発明はこのような知見に基いて達成されたものであり、以下を要旨とする。 The present invention has been achieved on the basis of such findings, and the gist thereof is as follows.
［１］ 野積み堆積物の発塵及び／又は水分上昇を防止する方法において、ポリマー粒子の平均粒子径が０．３〜３μｍで、標準偏差が０．２μｍ以上の粒度を有するエマルジョン樹脂溶液を野積み堆積物に散布することを特徴とする野積み堆積物の発塵及び／又は水分上昇防止方法。 [1] An emulsion resin solution having a mean particle diameter of 0.3 to 3 μm and a standard deviation of 0.2 μm or more in a method for preventing dust generation and / or increase in moisture in a field deposit A method of preventing dust generation and / or moisture rise of the field deposit, which is sprayed on the field deposit.
［２］ ［１］において、ポリマー粒子の平均粒子径が０．３〜０．６μｍであることを特徴とする野積み堆積物の発塵及び／又は水分上昇防止方法。 [2] A method for preventing dust from being generated and / or increasing water content, wherein the average particle size of the polymer particles is 0.3 to 0.6 μm in [1].
［３］ ［１］又は［２］において前記エマルジョン樹脂がアクリル系共重合樹脂であることを特徴とする野積み堆積物の発塵及び／又は水分上昇防止方法。 [3] A method for preventing dust generation and / or increase in moisture in the field deposit, wherein the emulsion resin is an acrylic copolymer resin in [1] or [2].
［４］ ［１］ないし［３］のいずれか１項において、前記野積み堆積物が、石炭の野積み堆積物であることを特徴とする野積み堆積物の発塵及び／又は水分上昇防止方法。 [4] In any one of [1] to [3], the field deposit is a field deposit of coal, and prevents generation of dust and / or increase of moisture in the field deposit. Method.
本発明で用いるエマルジョン樹脂溶液は、ポリマー粒子の粒子径が大きく、粒子径分布に広がりをもったものであり、このようなエマルジョン樹脂溶液を野積み堆積物に散布すると、エマルジョン樹脂は、野積み粉体の表層に広がって、膜厚が厚く、緻密で強固なコーティング膜を形成することができる。
このコーティング膜は、強固で亀裂が入り難いことから、粉塵の発生を確実に防止し得ると共に、ポリマー粒子の粒子径を更に制御することにより水分も浸透し難いコーティング膜とすることができ、野積み堆積物の水分上昇を確実に防止することができ、流炭防止にも有効である。
The emulsion resin solution used in the present invention has a large particle size of polymer particles and a spread in the particle size distribution. When such an emulsion resin solution is sprayed on the piled sediment, It spreads over the surface layer of the powder and can form a dense and strong coating film with a large film thickness.
Since this coating film is strong and difficult to crack, it can surely prevent the generation of dust, and by further controlling the particle size of the polymer particles, it can be made a coating film that hardly penetrates moisture. It is possible to reliably prevent an increase in the moisture content of the piled deposit, and is also effective in preventing charcoal.
以下に本発明の野積み堆積物の発塵及び／又は水分上昇防止方法の実施の形態を詳細に説明する。 The embodiment of the dust generation and / or moisture rise prevention method of the field deposit of the present invention will be described in detail below.
本発明においては、野積み堆積物の発塵及び／又は水分上昇を防止する方法において、ポリマー粒子の平均粒子径が０．３〜３μｍ、好ましくは０．３〜０．６μｍで、標準偏差が０．２μｍ以上の粒度を有するエマルジョン樹脂溶液を野積み堆積物に散布する。
なお、本発明において、エマルジョン樹脂溶液中のポリマー粒子の平均粒子径及び標準偏差は、レーザー回折式粒度分布測定装置（島津製作所社製ＳＡＬＤ−７０００）により求められたものである。
In the present invention, in the method for preventing dust generation and / or increase of moisture in the field deposit, the average particle diameter of the polymer particles is 0.3 to 3 μm, preferably 0.3 to 0.6 μm, and the standard deviation is An emulsion resin solution having a particle size of 0.2 μm or more is spread on the piled sediment.
In the present invention, the average particle size and standard deviation of the polymer particles in the emulsion resin solution are determined by a laser diffraction particle size distribution analyzer (SALD-7000 manufactured by Shimadzu Corporation).
＜野積み堆積物＞
本発明において、処理対象とする野積み堆積物とは、石炭、鉱石、コークス、スラグ、ダスト、木くず、ペーパースラッジ等を屋外貯蔵ヤードに山積みされたものをさす。
<Unloading sediment>
In the present invention, the field sediment to be treated refers to a pile of coal, ore, coke, slag, dust, wood scrap, paper sludge and the like piled up in an outdoor storage yard.
＜エマルジョン樹脂溶液＞
本発明において、野積み堆積物に散布するエマルジョン樹脂溶液は、ポリマー粒子の平均粒子径が０．３〜３μｍ、好ましくは０．３〜０．６μｍで、標準偏差が０．２μｍ以上の、粒子径が比較的大きく、また、粒子径分布に広がりをもつものである。
<Emulsion resin solution>
In the present invention, the emulsion resin solution sprayed on the piled deposit is a particle having an average particle size of 0.3 to 3 μm, preferably 0.3 to 0.6 μm, and a standard deviation of 0.2 μm or more. The diameter is relatively large and the particle size distribution is broad.
即ち、水を浸透させないことと、厚い膜を形成して強度を上げることを両立させるために、エマルジョン樹脂溶液中のポリマー粒子の粒子径分布を一定以上の範囲で大きくすることが必要となる。
ポリマー粒子の平均粒子径が小さ過ぎると、膜厚の薄い膜しか形成し得ず、平均粒子径が大き過ぎ、標準偏差も大きくないものであると、膜厚の厚い膜を形成できても、緻密な膜を形成し得ないため、水が浸透してしまう。
That is, it is necessary to increase the particle size distribution of the polymer particles in the emulsion resin solution within a certain range in order to achieve both the impregnation of water and the increase in strength by forming a thick film.
If the average particle diameter of the polymer particles is too small, only a thin film can be formed, and if the average particle diameter is too large and the standard deviation is not large, even if a thick film can be formed, Since a dense film cannot be formed, water penetrates.
本発明では、ポリマー粒子の粒度が、平均粒子径０．３〜３μｍで、標準偏差０．２μｍ以上であるため、厚い膜を形成して発塵を防止することができ、特にポリマー粒子の平均粒子径が０．３〜０．６μｍであれば、より一層厚く強度が高い膜を形成して遮水性をも確実に得ることができる。なお、ポリマー粒子の標準偏差の上限については、およそ１μｍ以下であることから、通常０．７μｍ以下である。また、ポリマー粒子の粒子径分布は極大値が一つでも複数あっても良い。 In the present invention, since the particle size of the polymer particles is 0.3 to 3 μm in average particle size and the standard deviation is 0.2 μm or more, it is possible to prevent the generation of dust by forming a thick film. If the particle diameter is 0.3 to 0.6 μm, it is possible to form a thicker and higher strength film and to ensure water shielding. In addition, about the upper limit of the standard deviation of a polymer particle, since it is about 1 micrometer or less, it is 0.7 micrometer or less normally. Further, the particle size distribution of the polymer particles may have one or a plurality of maximum values.
本発明で用いるエマルジョン樹脂溶液のエマルジョン樹脂としては、特に限定されず、アクリル系樹脂、アクリル系共重合樹脂、酢酸ビニル系樹脂、合成ゴム、ウレタン樹脂、アスファルト（乳化剤）などを用いることができる。これらは、１種を単独で用いてもよく、２種以上を併用してもよい。 The emulsion resin of the emulsion resin solution used in the present invention is not particularly limited, and acrylic resin, acrylic copolymer resin, vinyl acetate resin, synthetic rubber, urethane resin, asphalt (emulsifier) and the like can be used. These may be used alone or in combination of two or more.
なお、形成されるコーティング膜の遮水性を高めるために、エマルジョン樹脂に疎水性の高いモノマーを使用したり、エマルジョン樹脂溶液にワックス等の撥水剤を添加するなどの手段を講じてもよい。 In order to increase the water barrier property of the coating film to be formed, means such as using a highly hydrophobic monomer for the emulsion resin or adding a water repellent such as wax to the emulsion resin solution may be taken.
本発明で用いるエマルジョン樹脂溶液は、通常、上述のようなエマルジョン樹脂の水性エマルジョンであるが、その固形分濃度としては、２０〜６０重量％程度であることがエマルジョン樹脂溶液の粘度及び経済性の面から好ましく、このような濃度の水性エマルジョンを水で５〜３０重量％程度の固形分濃度に希釈して野積み堆積物に散布することが好ましい。 The emulsion resin solution used in the present invention is usually an aqueous emulsion of the emulsion resin as described above, but the solid content concentration is about 20 to 60% by weight because of the viscosity and economical efficiency of the emulsion resin solution. From an aspect, it is preferable to dilute an aqueous emulsion having such a concentration with water to a solid content concentration of about 5 to 30% by weight and to spray it on the field sediment.
＜散布方法＞
野積み堆積物へのエマルジョン樹脂溶液の散布方法としては特に制限はなく、散水車から堆積物に向けて散布したり、野積み用スタッカー上から散布したりし、その都度適当なポンプ、ノズルを選定して実施される。
<Spraying method>
There are no particular restrictions on the method of spraying the emulsion resin solution onto the piled deposits.Pattern from the sprinkler truck toward the deposits, or from the top of the stacker stacker, each time using an appropriate pump and nozzle. Selected and implemented.
また、散布量は、用いたエマルジョン樹脂や野積み堆積物に要求される粉塵ないしは水分上昇防止の程度により適宜決定されるが、上述の希釈エマルジョン樹脂溶液を野積み堆積物の表面積当たり、１〜３Ｌ／ｍ２程度散布することが好ましい。 In addition, the amount of spraying is appropriately determined according to the degree of dust or moisture prevention required for the emulsion resin and the field deposit used, but the above-mentioned diluted emulsion resin solution is 1 to 1 per surface area of the field deposit. it is preferred to spray approximately 3L / m 2.
エマルジョン樹脂溶液の散布後は、自然乾燥して造膜させる。 After spraying the emulsion resin solution, it is naturally dried to form a film.
このようにして形成されるコーティング膜は、膜厚が厚く強固な膜であるため、粉塵防止効果が高い。また、亀裂が入り難いことから、水分も浸透しにくく、水分上昇防止効果にも優れる。その結果、流炭防止にも有効である。 Since the coating film formed in this way is a thick and strong film, the dust prevention effect is high. In addition, since cracks are difficult to enter, it is difficult for water to penetrate, and the effect of preventing moisture rise is excellent. As a result, it is also effective in preventing charcoal.
以下に実施例及び比較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 and Comparative Examples.
［実施例１〜６、比較例１〜５］
＜膜厚の評価＞
縦１５ｃｍ、横２５ｃｍ、高さ１０ｃｍの容器に、−２ｍｍ粒度の石炭５０％と２〜５ｍｍ粒度の石炭を５０％混合した石炭を詰め、この状態で、容器を高さ１ｃｍ程度の高さから１０回自然落下させ、石炭の充填層高さが５ｃｍとなるように調整し、充填層の上面は平滑になるようならした。
このようにして作製した石炭層の上面に、表１に示すエマルジョン樹脂溶液を、石炭層の上面の面積に対して２Ｌ／ｍ２となるように霧吹きで散布し、その後自然乾燥させて、形成されたコーティング膜の膜厚を測定した。
結果を表１に示す。
[Examples 1-6, Comparative Examples 1-5]
<Evaluation of film thickness>
Pack a 15cm long, 25cm wide, 10cm high container with 50% -2mm coal and 50% 2-5mm coal, and in this state, the container is about 1cm in height. Naturally dropped 10 times and adjusted so that the height of the packed bed of coal was 5 cm, so that the upper surface of the packed bed became smooth.
The emulsion resin solution shown in Table 1 is sprayed on the upper surface of the coal layer thus prepared so as to be 2 L / m 2 with respect to the area of the upper surface of the coal layer, and then naturally dried to form. The film thickness of the coated film was measured.
The results are shown in Table 1.
＜石炭含水率の評価＞
野積み石炭の傾斜面を模擬するために、円筒を斜めに切断した斜面円筒容器（内径７５ｍｍ、斜面下部高さ８３ｍｍ、斜面上部高さ１４０ｍｍ、安息角約３７゜）を準備した。容器の下部は石炭が流れないよう、３０ｍｅｓｈ程度の網を設けた。この野積み石炭の傾斜面を模擬した斜面円筒容器に石炭を詰め、傾斜面の石炭上に表１に示すエマルジョン樹脂溶液を石炭表面の面積当たり２Ｌ／ｍ２となるように霧吹きで散布し、室内に１週間静置させて造膜させた。その後、人工降雨装置内にこの円筒容器を設置した。
用いた人工降雨装置は、天井に設置された針より水滴を垂らすもので、均一な降雨が再現できる装置である。本試験では５０ｍｍ／ｈｒの降雨量にて、５時間の試験時間とし、試験後の石炭の含水率を斜面円筒容器の重量変化により測定した。結果を表１に示す。
<Evaluation of moisture content of coal>
In order to simulate the inclined surface of field coal, a sloped cylindrical container (inner diameter 75 mm, slope lower part height 83 mm, slope upper part height 140 mm, angle of repose about 37 °) was prepared. The lower part of the container was provided with a mesh of about 30 mesh so that coal would not flow. The sloped cylindrical container simulating the sloped surface of this piled coal is filled with coal, and the emulsion resin solution shown in Table 1 is sprayed on the sloped surface of the coal so as to be 2 L / m 2 per area of the coal surface, The film was allowed to stand in the room for 1 week to form a film. Then, this cylindrical container was installed in the artificial rain apparatus.
The artificial rain device used is a device that drips water droplets from a needle installed on the ceiling and can reproduce uniform rain. In this test, the test time was 5 hours with a rainfall of 50 mm / hr, and the moisture content of the coal after the test was measured by the weight change of the inclined cylindrical container. The results are shown in Table 1.
防水性のある膜が形成されている場合には、石炭の含水率は上昇せず、十分に膜が形成されていない場合や防水性のある膜が形成されていない場合には石炭の含水率が上昇する。
石炭含水率が上昇しない膜が形成されているということは、エネルギーロスの防止に繋がり、表面の石炭粒子が十分に膜で被覆されているということになるため、発塵が防止される。また、流炭は石炭の含水率が上がりスラリー状となることで野積み石炭から流れ崩れる現象であるが、これも石炭の含水率を上昇させないことで防止が可能である。
When a waterproof membrane is formed, the moisture content of coal does not increase, and when the membrane is not sufficiently formed or when a waterproof membrane is not formed, the moisture content of coal Rises.
The formation of a film that does not increase the moisture content of coal leads to the prevention of energy loss, and the coal particles on the surface are sufficiently covered with the film, so that dust generation is prevented. In addition, the flow coal is a phenomenon in which the moisture content of the coal increases and becomes a slurry, causing the flow to collapse from the piled coal, but this can also be prevented by not increasing the moisture content of the coal.
＜総合評価＞
膜厚１０〜２０ｍｍの膜が形成されている場合を「○」とし、膜厚がそれよりも薄い場合を「×」とした。
また、石炭含水率５重量％以下を「○」とし、含水率が５重量％を超える場合を「×」とした。
膜厚及び石炭含水率が両方とも「○」であるものを総合評価「○」とし、膜厚が「○」で石炭含水率が「×」のものを「△」とし、それ以外を「×」とし、結果を表１に示した。
<Comprehensive evaluation>
The case where a film having a film thickness of 10 to 20 mm was formed was indicated by “◯”, and the case where the film thickness was thinner than that was indicated by “X”.
Moreover, the case where the water content of coal was 5% by weight or less was set as “◯”, and the case where the water content exceeded 5% by weight was set as “X”.
When the film thickness and coal moisture content are both “O”, the overall evaluation is “O”, when the film thickness is “O” and the coal moisture content is “X”, it is “△”, and the others are “X” The results are shown in Table 1.
以上の結果から、ポリマー粒子の平均粒子径が０．３〜３μｍで、標準偏差が０．２μｍ以上の粒度を有するエマルジョン樹脂溶液を用いる本発明によれば、野積み堆積物に、膜厚が厚く、粉塵発生の防止効果に優れたコーティング膜を形成することができ、特に、ポリマー粒子の平均粒子径が０．３〜０．６の範囲であれば、膜厚が厚く、かつ水不透性に優れ、粉塵の発生のみならず、水分の上昇の防止効果にも優れたコーティング膜を形成することができることが分かる。 From the above results, according to the present invention using an emulsion resin solution having an average particle size of polymer particles of 0.3 to 3 μm and a standard deviation of 0.2 μm or more, the film thickness is It is possible to form a coating film that is thick and excellent in dust generation prevention effect. It can be seen that it is possible to form a coating film that is excellent in properties and not only the generation of dust but also the effect of preventing the rise of moisture.
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| KR101889183B1 (en) * | 2016-12-20 | 2018-09-20 | 주식회사 포스코 | Apparatus and method for preventing materials from dispersing |
| JP2020026489A (en) * | 2018-08-13 | 2020-02-20 | 栗田工業株式会社 | Coal anti-oxidation agent, and coal oxidation prevention method |
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| JP7480816B2 (en) | 2022-10-13 | 2024-05-10 | 栗田工業株式会社 | Water-repellent and dust-proofing agent, ionic wax emulsion for water-repellent and dust-proofing agent, manufacturing method for water-repellent and dust-proofing agent, and method for preventing dust generation and moisture rise in open-air piles |
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