JP2010194502A - Phosphorus compound accumulation method and recovery method - Google Patents
Phosphorus compound accumulation method and recovery method Download PDFInfo
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- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 115
- 239000011574 phosphorus Substances 0.000 title claims abstract description 115
- -1 Phosphorus compound Chemical class 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000011084 recovery Methods 0.000 title abstract description 22
- 238000009825 accumulation Methods 0.000 title description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000000463 material Substances 0.000 claims abstract description 38
- 244000144972 livestock Species 0.000 claims abstract description 20
- 239000012298 atmosphere Substances 0.000 claims abstract description 18
- 210000003608 fece Anatomy 0.000 claims abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000001301 oxygen Substances 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 230000002950 deficient Effects 0.000 claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000002361 compost Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000010801 sewage sludge Substances 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 abstract description 14
- 238000003763 carbonization Methods 0.000 abstract description 12
- 239000005539 carbonized material Substances 0.000 abstract description 4
- 239000003337 fertilizer Substances 0.000 description 6
- 239000000428 dust Substances 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010000 carbonizing Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 239000010871 livestock manure Substances 0.000 description 2
- 159000000003 magnesium salts Chemical class 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- FUFJGUQYACFECW-UHFFFAOYSA-L calcium hydrogenphosphate Chemical compound [Ca+2].OP([O-])([O-])=O FUFJGUQYACFECW-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000019700 dicalcium phosphate Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004453 electron probe microanalysis Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 1
- 239000004137 magnesium phosphate Substances 0.000 description 1
- 229960002261 magnesium phosphate Drugs 0.000 description 1
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 1
- 235000010994 magnesium phosphates Nutrition 0.000 description 1
- YQRTZUSEPDULET-UHFFFAOYSA-K magnesium;potassium;phosphate Chemical compound [Mg+2].[K+].[O-]P([O-])([O-])=O YQRTZUSEPDULET-UHFFFAOYSA-K 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
- 150000003017 phosphorus Chemical class 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
- PSGCRHLFZJRYEA-UHFFFAOYSA-N phosphorus p2o5 Chemical compound P.O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 PSGCRHLFZJRYEA-UHFFFAOYSA-N 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
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Abstract
Description
本発明は、畜糞などに含まれるリン化合物の集積方法および回収方法に関する。 The present invention relates to a method for collecting and collecting a phosphorus compound contained in livestock feces and the like.
近年のリン鉱石需要の逼迫より、国内のリン酸質肥料の価格が急騰し、耕種農家の財政を圧迫している。ところで、我が国は肥料や鉱石以外に食糧や飼料の形で毎年１６０万ｔものリンを輸入しており、その多くは人や家畜を通して糞尿に移行して廃棄されていることから、既に、下水、家畜尿などからリンを回収する技術として、ＨＡＰ法、ＭＡＰ法などが確立されている。 In recent years, the price of phosphate fertilizers has soared due to the tight demand for phosphate ore, which has put pressure on cultivated farmers. By the way, Japan imports 1.6 million tons of phosphorus every year in the form of food and feed in addition to fertilizers and ores, and many of them are transferred to manure through humans and livestock, and are already discarded. As a technique for recovering phosphorus from livestock urine, the HAP method, the MAP method, and the like have been established.
一方、家畜の糞（畜糞という）などの固形物中からリンを回収する技術としては、特開２００７−７０２１７号公報に開示された方法がある。
このリンを回収する方法は、畜産系焼却灰から鉱酸水溶液を調製した後、水酸化ナトリウムまたは水酸化カルシウムを用いてｐＨを調整し鉄イオンを除去し、さらにそれらをアルカリ水溶液と混合することにより、リンをヒドロキシアパタイトおよび／またはリン酸水素カルシウムの無機リン化合物として選択的に凝集・沈殿させる方法である。
On the other hand, as a technique for recovering phosphorus from solid matter such as livestock dung (referred to as livestock dung), there is a method disclosed in Japanese Patent Application Laid-Open No. 2007-70217.
The method for recovering this phosphorus is to prepare a mineral acid aqueous solution from livestock incineration ash, then adjust the pH using sodium hydroxide or calcium hydroxide to remove iron ions, and then mix them with an alkaline aqueous solution. Thus, phosphorus is selectively agglomerated and precipitated as an inorganic phosphorus compound of hydroxyapatite and / or calcium hydrogen phosphate.
しかし、上述した従来のリンの回収方法によると、どうしても、回収に要するエネルギーおよびコストが多くかかるという問題がある。
そこで、本発明は、畜糞などのリン含有物からリンを回収する際に必要となるエネルギーおよびコストの低減化を図り得るリン化合物の集積方法および回収方法を提供することを目的とする。
However, according to the conventional phosphorus recovery method described above, there is a problem that much energy and cost are required for recovery.
Therefore, an object of the present invention is to provide an accumulation method and a collection method of a phosphorus compound that can reduce energy and cost required when collecting phosphorus from a phosphorus-containing material such as livestock excrement.
上記課題を解決するため、本発明のリン化合物の集積方法は、リン含有物を酸素欠乏雰囲気下で３００〜６００℃の温度にて加熱することによりリン化合物を当該リン含有物の表面に集積させる方法である。 In order to solve the above-described problems, the phosphorus compound accumulation method of the present invention accumulates a phosphorus compound on the surface of the phosphorus-containing material by heating the phosphorus-containing material at a temperature of 300 to 600 ° C. in an oxygen-deficient atmosphere. Is the method.
また、本発明のリン化合物の回収方法は、リン含有物を酸素欠乏雰囲気下で３００〜６００℃の温度にて加熱し、次にこの加熱した後のリン含有物の表面を剥ぎ取ることによりリン化合物を回収する方法である。 The method for recovering a phosphorus compound of the present invention comprises heating a phosphorus-containing material at a temperature of 300 to 600 ° C. in an oxygen-deficient atmosphere, and then peeling off the surface of the phosphorus-containing material after heating. A method for recovering a compound.
また、上記回収方法において、リン含有物を、粒状、棒状、シート状などの塊状物に成型させる方法であり、また加熱した後のリン含有物を窒素流通雰囲気下で冷却する方法であり、また篩装置若しくはサイクロンを用いて粒子の表面を剥ぎ取る方法である。 Further, in the above recovery method, the phosphorus-containing material is formed into a lump such as granular, rod-like, or sheet-like, and the heated phosphorus-containing material is cooled in a nitrogen circulation atmosphere. In this method, the surface of the particles is peeled off using a sieving device or a cyclone.
さらに、上記回収方法において、リン含有物を、下水汚泥、畜糞、若しくはこれらの混合物、または堆肥とする方法である。 Further, in the above recovery method, the phosphorus-containing material is sewage sludge, livestock dung, or a mixture thereof, or compost.
上記のリン化合物の集積方法によると、リン含有物を酸素欠乏雰囲気下で３００〜６００℃の温度にて加熱してリン化合物を当該リン含有物の表面に集積させるようにしたので、例えばその表面を剥ぎ取ることにより、簡単に、すなわち非常に少ないエネルギーおよび低コストでもって、リン化合物を得ることができる。 According to the phosphorus compound accumulation method, the phosphorus compound is heated at a temperature of 300 to 600 ° C. in an oxygen-deficient atmosphere so that the phosphorus compound is accumulated on the surface of the phosphorus compound. By stripping off, it is possible to obtain the phosphorus compound easily, that is, with very little energy and low cost.
また、上記のリン化合物の回収方法によると、リン含有物を酸素欠乏雰囲気下で３００〜６００℃の温度にて加熱し、次にこの加熱した後のリン含有物の各粒子の表面を剥ぎ取ることによりリン化合物を回収するようにしたので、例えば従来の湿式の回収技術に比べて、非常に少ないエネルギーおよび低コストでもって、畜糞等の低濃度リン含有物から高濃度のリン化合物を回収することができる。 Further, according to the above phosphorus compound recovery method, the phosphorus-containing material is heated at a temperature of 300 to 600 ° C. in an oxygen-deficient atmosphere, and then the surface of each particle of the phosphorus-containing material after the heating is peeled off. As a result, the phosphorus compound is recovered, so that a high concentration phosphorus compound is recovered from low-concentration phosphorus-containing materials such as livestock dung, for example, with much less energy and lower cost than conventional wet recovery techniques. be able to.
以下、本発明の実施の形態に係るリン化合物の集積方法および回収方法を図面に基づき説明する。
ところで、リン化合物の集積方法は、リン化合物の回収方法の構成の一部に含まれるため、リン化合物の回収方法の中で説明する。
Hereinafter, an accumulation method and a recovery method of a phosphorus compound according to an embodiment of the present invention will be described with reference to the drawings.
By the way, the phosphorus compound accumulation method is included in a part of the configuration of the phosphorus compound recovery method, and will be described in the phosphorus compound recovery method.
まず、リン化合物の回収方法を実施するための回収設備について説明する。
この回収設備は、図１に示すように、リン含有物、例えばリン化合物を含む畜糞からリン化合物を回収するためのもので、概略的には、造粒機１と、この造粒機１で或る程度の大きさ、例えば０．５〜１０ｍｍ程度に造粒されたリン含有物（以下、造粒物ともいう）を炭化させる炭化炉２と、この炭化炉２で炭化されたリン含有物（以下、炭化物ともいう）を冷却させる冷却器３と、この冷却器３で冷却された炭化物を導きその表面部分を剥離させる表面剥離装置４と、上記炭化炉２から排出された乾留ガスを燃焼させる二次燃焼炉５と、この二次燃焼炉５で燃焼された排ガスを導き灰などの粉塵を回収するろ過式集塵機（例えば、バグフィルタが用いられる）６と、この集塵機６で粉塵が除去された排ガスを吸引し大気に放出するための誘引送風機７および煙突８とから構成されている。
First, a recovery facility for carrying out the phosphorus compound recovery method will be described.
As shown in FIG. 1, this recovery facility is for recovering a phosphorus compound from a phosphorus-containing material, for example, livestock feces containing a phosphorus compound, and is roughly composed of a granulator 1 and this granulator 1. A
上記炭化炉２では、リン含有物を酸素欠乏雰囲気下（例えば、酸素濃度が０〜５％の範囲内）で３００〜６００℃の温度（温度範囲内）で加熱してリン化合物の炭化を行うと同時にリンを表面に析出させる（リン化合物の集積方法である）。
In the
上記冷却器３では、リン含有物は窒素流通雰囲気下で冷却が行われる。
そして、上記表面剥離装置４としては篩装置が用いられており、リン含有物（炭化物である）の粒子同士を互いに衝突させて表面を破砕することにより、表面の剥離が行われる。
In the cooler 3, the phosphorus-containing material is cooled in a nitrogen circulation atmosphere.
And the screen apparatus is used as the said surface peeling apparatus 4, The surface peeling is performed by colliding the particle | grains of a phosphorus containing material (it is a carbide | carbonized_material) mutually and crushing the surface.
ここで、本発明に至った経緯について簡単に説明しておく。
本発明者等は、回収コストを抑える手段として残渣にエネルギーを残すことができる炭化プロセスに注目し、実験（具体例については後述する）を行ったところ、畜糞を酸素欠乏雰囲気下（例えば、酸素濃度が０〜５％の範囲内）で３００〜６００℃の温度で加熱した残渣粒子を電子顕微鏡により観察した結果、粒子に含有するリンが比較的表面に偏在していることが判明した。そして、このリン含有物に衝撃を与えて剥ぎ取った粒子のリン含有量を測定すると、炭化物全体の濃度よりも、３０％程度高くなっていることが分かり、さらにこの粒子のＸ線回折による形態分析を行ったところ、リン化合物としては、リン酸マグネシウムおよびリン酸マグネシウムカリウムが多く含まれることも判明したことに基づいている。
Here, the background to the present invention will be briefly described.
The present inventors focused on a carbonization process capable of leaving energy in the residue as a means of reducing the recovery cost, and conducted experiments (specific examples will be described later). As a result, livestock dung was placed in an oxygen-deficient atmosphere (for example, oxygen As a result of observing with an electron microscope residual particles heated at a temperature of 300 to 600 ° C. in a concentration range of 0 to 5%, it was found that phosphorus contained in the particles was relatively unevenly distributed on the surface. Then, when the phosphorus content of the particles peeled off by impacting the phosphorus-containing material was measured, it was found that the concentration was about 30% higher than the concentration of the entire carbide. The analysis was based on the fact that the phosphorus compound was found to contain a large amount of magnesium phosphate and magnesium potassium phosphate.
このことは、水等の溶媒を用いずに高濃度リン化合物を製造できる可能性を示しており、従来の湿式抽出技術に比べて、回収に要するエネルギーおよびコストを非常に少なくすることができ、且つ炭素分を燃焼させずに固定炭素にすることができる。したがって、地球温暖化防止に貢献し得る技術ということができる。 This indicates the possibility that a high concentration phosphorus compound can be produced without using a solvent such as water, and compared with the conventional wet extraction technology, the energy and cost required for recovery can be greatly reduced. In addition, the carbon component can be converted to fixed carbon without burning. Therefore, it can be said that it can contribute to the prevention of global warming.
次に、リン化合物の回収方法について説明する。
リン化合物を含んだ畜糞を造粒機１に投入して、外径が０．５〜１０ｍｍ（好ましくは、０．５〜５ｍｍ）程度となるように造粒する。これは、後工程でのリンの回収率を上げるためである。
Next, a method for recovering the phosphorus compound will be described.
Livestock feces containing a phosphorus compound are put into the granulator 1 and granulated so that the outer diameter is about 0.5 to 10 mm (preferably 0.5 to 5 mm). This is to increase the recovery rate of phosphorus in the subsequent process.
そして、造粒されたリン含有物を炭化炉２に供給する。
炭化炉２では、酸素欠乏雰囲気下で３００〜６００℃の温度でもって維持される。その滞留時間としては、リン含有物に含まれている水分量にもよるが、概ね、１５〜６０分程度の範囲内とされる。
Then, the granulated phosphorus-containing material is supplied to the
In the
次に、炭化炉２から排出されたリン化合物の炭化物は冷却器３に導かれて冷却される。なお、炭化炉２から排出される炭化物は可燃分を含んでおり発火の危険性があるため、冷却は窒素流通雰囲気下（窒素雰囲気下）で行うことが好ましい。
Next, the phosphorus compound carbide discharged from the
そして、冷却器３で冷却されたリン含有物は表面剥離装置４としての篩装置に導かれ、ここで篩にかけられる。この篩動作によりリン含有物の粒子同士が接触してその表面が剥離され、高濃度リン含有炭化物が得られる。すなわち、低濃度リン含有炭化物と高濃度リン含有炭化物とに分離される。 And the phosphorus containing material cooled with the cooler 3 is guide | induced to the sieve apparatus as the surface peeling apparatus 4, and is sieved here. By this sieving operation, particles of phosphorus-containing material come into contact with each other and the surface thereof is peeled off, and a high-concentration phosphorus-containing carbide is obtained. That is, it is separated into a low concentration phosphorus-containing carbide and a high concentration phosphorus-containing carbide.
この高濃度リン含有炭化物、すなわちリンのマグネシウム塩は付加価値の高いリン化合物として、肥料や肥料原料などに利用される。一方、低濃度リン含有炭化物は燃料や脱臭剤、水分調整剤などに利用される。 This high-concentration phosphorus-containing carbide, that is, a magnesium salt of phosphorus, is used as a high-value-added phosphorus compound for fertilizers, fertilizer raw materials, and the like. On the other hand, low-concentration phosphorus-containing carbides are used as fuels, deodorizers, moisture regulators, and the like.
ところで、本発明者等が行った試験（上述した試験）では、リンをＰ２Ｏ５ベースで６％（乾ベース）含む豚糞堆肥を酸素欠乏雰囲気下で５００℃の温度で炭化させて冷却した後の炭化物に含まれるリンはＰ２Ｏ５ベースで１５．７％（乾ベース）であった。 By the way, in the test conducted by the present inventors (the test described above), pig manure compost containing 6% (dry base) of phosphorus in P 2 O 5 base was carbonized at a temperature of 500 ° C. in an oxygen-deficient atmosphere and cooled. After that, phosphorus contained in the carbide was 15.7% (dry basis) based on P 2 O 5 .
この炭化物粒子のリン存在部位を表面分析装置（例えば、ＳＥＭ−ＥＰＭＡ）にて観察した結果、リンは粒子表面に偏在していることが分かった。
この粒子に軽く衝撃を加えながら分級し、７５μｍ以下の粒子をＸ線回折により形態分析を行ったところ、炭化物表面とほぼ同じ化合物であることが同定され、またそのリンの濃度はＰ２Ｏ５ベースで１６．７〜１９．９％にのぼることが分かった。
As a result of observing the phosphorus existing site of the carbide particles with a surface analyzer (for example, SEM-EPMA), it was found that phosphorus was unevenly distributed on the particle surface.
Lightly impact classified while adding to the particles, where the particles below 75μm were forms analyzed by X-ray diffraction, it was identified that almost the same compound as the carbide surface and the concentration of phosphorus P 2 O 5 It was found to be 16.7 to 19.9% on the basis.
この方法により、畜糞から高濃度のリンを含む粒子を回収することができた。
すなわち、従来の湿式の回収技術に比べて、非常に少ないエネルギーおよび低コストでもって、畜糞の低濃度リン含有物から高濃度のリン化合物を回収することができる。
By this method, particles containing a high concentration of phosphorus could be recovered from livestock dung.
That is, it is possible to recover a high concentration phosphorus compound from a low concentration phosphorus-containing material of livestock feces with very little energy and low cost compared to conventional wet recovery techniques.
また、リン含有物を酸素欠乏雰囲気下、例えば酸素濃度が０〜５％の範囲内で３００〜６００℃の温度にて加熱することによりリンを当該リン含有物の表面に集積させるようにしたので、リンを回収するのに、その表面を剥ぎ取るだけで、容易にリンを回収することができる。すなわち、上述したリン化合物の集積方法によると、非常に少ないエネルギーおよび低コストでもって、リン化合物を得ることができる。 In addition, phosphorus is accumulated on the surface of the phosphorus-containing material by heating the phosphorus-containing material in an oxygen-deficient atmosphere, for example, at a temperature of 300 to 600 ° C. within a range of 0 to 5% oxygen concentration. To recover phosphorus, phosphorus can be easily recovered by simply peeling off the surface. That is, according to the phosphorus compound accumulation method described above, the phosphorus compound can be obtained with very little energy and low cost.
さらに、従来の焼却灰からの回収方法では、リンがカルシウム塩になっているのに対し、リン化合物を炭化物として回収した場合には、マグネシウム塩となるため、肥料や肥料原料として利用することができる。 Furthermore, in the conventional recovery method from incineration ash, phosphorus is calcium salt, but when phosphorus compound is recovered as carbide, it becomes magnesium salt, so it can be used as fertilizer or fertilizer raw material it can.
本発明のリン化合物の回収方法は、持続的農業生産はもとより、地球温暖化抑制への発展にも寄与するものである。
ところで、上記実施の形態においては、最初に、リン含有物を造粒させるようにしたが、例えば棒状、シート状などの塊状物に成型させるようにしてもよい（この意味で、造粒を成型と、また造粒機を成型機と呼ぶことができる）。すなわち、この塊状物を炭化させることにより、造粒の場合と同様に、リン化合物をその表面に集積させることができる。この場合の棒状のサイズとしては、径が０．５〜２０ｍｍの範囲で、長さが２０〜５０ｍｍの範囲とされ、またシート状のサイズとしては、厚さが０．５〜１０ｍｍの範囲で、面積が１００〜１０００ｍｍ２の範囲とされる。
The phosphorus compound recovery method of the present invention contributes not only to sustainable agricultural production, but also to the development of global warming suppression.
By the way, in the above embodiment, the phosphorus-containing material is first granulated. However, it may be formed into a lump such as a rod or sheet (in this sense, granulation is molded). And the granulator can also be called a molding machine). That is, by carbonizing the lump, the phosphorus compound can be accumulated on the surface as in the case of granulation. In this case, the rod-like size has a diameter in the range of 0.5 to 20 mm and the length in the range of 20 to 50 mm. The sheet-like size has a thickness in the range of 0.5 to 10 mm. The area is in the range of 100 to 1000 mm 2 .
また、上記実施の形態においては、リン含有物を炭化させた炭化物の表面を剥ぎ取るのに篩装置を用いたが、篩装置を用いずに、炭化物の移動経路で自らの接触による摩擦力、配管内面との接触による摩擦力により、またはサイクロンを用い、当該サイクロンにおける粒子の気流搬送時での壁面摩擦法により、表面を剥ぎ取るようにしてもよい。 Moreover, in the above embodiment, the sieving device was used to peel off the surface of the carbide obtained by carbonizing the phosphorus-containing material, but without using the sieving device, the frictional force due to its own contact in the movement path of the carbide, The surface may be peeled off by a frictional force due to contact with the inner surface of the pipe, or by a wall surface friction method at the time of air current transportation of particles in the cyclone using a cyclone.
なお、上記実施の形態においては、リン含有物として、畜糞について説明したが、下水汚泥、畜糞と下水汚泥の混合物、または堆肥などであっても、同様の効果が得られる。 In the above embodiment, livestock excrement has been described as a phosphorus-containing material, but the same effect can be obtained even with sewage sludge, a mixture of livestock feces and sewage sludge, or compost.
１ 造粒機
２ 炭化炉
３ 冷却器
４ 表面剥離装置
５ 二次燃焼炉
６ ろ過式集塵機
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