JPS6131079B2 - - Google Patents
Info
- Publication number
- JPS6131079B2 JPS6131079B2 JP56082764A JP8276481A JPS6131079B2 JP S6131079 B2 JPS6131079 B2 JP S6131079B2 JP 56082764 A JP56082764 A JP 56082764A JP 8276481 A JP8276481 A JP 8276481A JP S6131079 B2 JPS6131079 B2 JP S6131079B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- phosphoric acid
- particle size
- product
- fertilizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 46
- 239000003337 fertilizer Substances 0.000 claims description 26
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 23
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 21
- 239000011574 phosphorus Substances 0.000 claims description 21
- 229910052698 phosphorus Inorganic materials 0.000 claims description 21
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 24
- 239000007864 aqueous solution Substances 0.000 description 10
- 238000004090 dissolution Methods 0.000 description 10
- 238000010828 elution Methods 0.000 description 6
- 239000008187 granular material Substances 0.000 description 6
- 238000005469 granulation Methods 0.000 description 6
- 230000003179 granulation Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 238000010298 pulverizing process Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004720 fertilization Effects 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229940095686 granule product Drugs 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- UNXRWKVEANCORM-UHFFFAOYSA-N triphosphoric acid Chemical compound OP(O)(=O)OP(O)(=O)OP(O)(O)=O UNXRWKVEANCORM-UHFFFAOYSA-N 0.000 description 1
- 229940048102 triphosphoric acid Drugs 0.000 description 1
Landscapes
- Fertilizers (AREA)
Description
本発明は顆粒状溶成りん肥の製造方法に関す
る。
一般に溶成りん肥は水に殆んど溶解せず、土壌
および植物の根の作用により、その表面から徐々
に溶解する肥料であるためにその粒子が大きくな
つて表面積が小さくなると肥効が悪くなる。
表面積を大きくするため原料の加熱溶融物と急
冷破砕する際に細粉化すると施肥作業で飛散し易
く、作業性が悪い。一方、急冷粗砕すれば表面積
が小さくなり、かつ粒子のカサも小さくなるため
均一な施肥が困難になり更に肥効を悪くする。
そこで、従来より原料の加熱溶融物の急冷乾燥
品を粉砕した粉状品か、あるいは、一定の範囲に
限定した粒度のものに、適宜のバインダーを加え
て造粒し、次いで乾燥工程を経て、カサ高でかつ
機械施肥にも適する飛散しにくい粒状品にするこ
とが行なわれている。しかしながら、上記従来技
術は、粉砕工程と乾燥工程を要し工業的に有利な
方法とはいえない。
又、溶成りん肥をリん酸その他の酸で処理して
その表面を水溶性化する試みは、例えば、特公昭
35−8625号、特公昭29−2472号、特開昭54−
111465号公報等に見られるが、これらはいずれも
その表面が水溶性リん酸で包被された複合肥料で
あり、本来の溶成りん肥の性能を保持していない
点で本質的に本発明の目的物とは異なる。
本発明者等は上記に鑑み、粉砕工程と乾燥工程
を省略した作業性と肥効のよい即ちカサ高でしか
も一次粒子を多数結合させ表面積の大きな所望の
粒径に造粒した顆粒状の溶成りん肥の製造方法に
つき種々検討した結果、溶成りん肥急冷品の未粉
砕品に特定濃度のリん酸をP2O5換算で特定量添
加しつつ造粒すると目的が達成し得ることを見出
し本発明を完成した。
即ち本発明は、粒度分布が1000〜2000μ０〜５
重量％、500〜1000μ0.1〜30重量％、260〜500μ
３〜50重量％、149〜260μ10〜75重量％、149μ
以下２〜25重量％の範囲に入る溶成りん肥急冷品
に、0.1〜３重量％（P2O5換算）の濃度30〜65重
量％リん酸を噴霧して造粒することを特徴とする
顆粒状溶成りん肥の製造方法である。
溶成りん肥急冷品の粒度は、破砕条件等によつ
てその粒度分布を変えることができるが、得られ
る溶成りん肥のクエン酸溶出率を高くする必要か
ら自ずと破砕時の粒度が制限される。
本発明で用いる溶成りん肥急冷品は、通常リん
鉱石に珪酸マグネシウム系鉱物、例えば蛇紋岩ま
たはニツケル精錬スラグを混合し、加熱溶融した
後、水または／および空気で急冷破砕して製造さ
れ、その粒度分布が上記範囲に入るなりゆきの製
品で改めて特別の粉砕工程を経ない。尚、水砕品
については乾燥したものをそのまま使用する。
次いで、溶成りん肥急冷品に対してリん酸水溶
液を噴霧しつつ通常の転動造粒機、例えば皿型造
粒機、ドラム型造粒機、振動型造粒機などを用い
て造粒する。
噴霧するリん酸は濃度30〜65重量％の水溶液が
適当で、特に望ましくは、30〜60重量％水溶液
で、この範囲では溶成りん肥急冷品に対して反応
が急速で、粒子は互に凝集し、所望の大きさに造
粒される。又、造粒品のクエン酸溶解速度も速
く、水溶性リん酸含量も１重量％（P2O5換算）
以下に調整出来、溶成りん肥本来の性質を保持で
きる。
上記のリん酸水溶液の添加量は、溶成りん肥急
冷品に対してP2O5換算で0.1〜３重量％が適当
で、この範囲では粒径2000μ以下の顆粒状溶成り
ん肥が得られ、造粒後の乾燥工程を要しない。こ
れは添加したリん酸水溶液中の水がリん酸２乃至
３石灰（苦土）の結晶水に一部取り込まれるの
と、反応熱による蒸発によつて造粒直後実質的に
乾燥状態で得られるためと考えられる。使用する
リん酸濃度によつても異なるが、通常添加量３重
量％より大の場合、造粒直後の粒子は濡れた状態
で開き目2000μの篩を通過しない程度であるか、
表面は乾燥状態であるがポリエチレン製袋内に約
１昼夜密閉貯蔵すると袋内側に結露し、かかる状
態の造粒品は一般にクエン酸溶解速度が遅いので
好ましくない。又、リん酸水溶液の添加量が0.1
重量％未満では造粒した効果が少なく顆粒状の製
品が得られない。
次いで造粒後は、好ましくは所望の粒度に篩分
ける。顆粒品の粒度は500〜2000μの範囲が一般
的に適当であり、2000μより大きい顆粒品は粉砕
し、500μ未満は元の原料に戻す。何となれば溶
成りん肥は粒度のバラツキが大になると、散布時
偏りを生じ易く、また公定規格では2000μ以下と
規定されているからであり、下限の500μについ
ては発塵せずに撒布性を良好にするためと、他の
造粒肥料とのブレンデイングの際の分級防止のた
めである。
かくして、本考案によればカサ高で、防塵性、
手ざわり、撒布性良好にして、溶成りん肥本来の
特質即ち、水溶性りん酸含量１重量％（P2O5換
算）以下、クエン酸による溶解速度は一般の溶成
りん肥と同等又はそれ以上を保持した顆粒状溶成
りん肥を工業的に極めて容易に製造できる。又、
本発明によつて得られる顆粒状溶成りん肥には、
水を加えた際、石灰、苦土系の溶出による高いPH
を僅かな量の水溶性リん酸の緩衝よりやわらげる
特徴もあり、最近の中性の溶成りん肥を要望する
業界の声にも応えるものである。
尚、目的物の物性測定については、カサ、水溶
性リん酸については常法により、粒度、防塵性、
手ざわり、撒布性については篩別、触感、肉限判
定によつた。又、クエン酸による溶解速度の測定
方法については各種提案されているが、未だ確立
された方法がないため本発明者等は下記の溶出率
をもつて、原料として使用した溶成りん肥と対比
した。第１図は溶出率測定装置である。ここで溶
出管１の下部に脱脂綿２の小片を支持層として入
れ、その上に紙パルプ３を詰め平らな過面を
作る。そこに分析試料４を２ｇ正確に量つて落下
させ、溶出液容器５より、温度10℃の２重量％ク
エン酸水溶液６を用い溶出を始める。２重量％ク
エン酸水溶液は750mlを用い、30分間で浸透し終
るように滴下速度調節用コツク７で滴下速度を調
整する。
溶解速度は受器８の水溶液中のリん酸含量を測
定し、次式によつて溶出率（％）として表わす。
溶出率（％）＝ａ×１００／ｂ
ａ：造粒された顆粒状溶成りん肥のク溶性リん
酸含量（重量％）
ｂ：原料として使用した溶成りん肥のク溶性リ
ん酸含量（重量％）
以下、実施例を挙げて本発明を具体的に説明す
る。
実施例１〜４及び比較例１〜６
溶成りん肥（1000〜2000μ0.7重量％、500〜
1000μ29.0重量％、260〜500μ42.5重量％、149
〜260μ21.0重量％、149μ以下5.8重量％、カサ
0.650／Kg）に濃度５〜75重量％のそれぞれの
リん酸液を霧状に所定量添加しながら、回転皿型
造粒機で造粒し、直ちに開し目2000μおよび500
μの篩でふるい分け、粒度2000μ〜500μの範囲
を製品とし、ポリ袋に袋詰めした。500μふるい
下は元の溶成りん肥に戻し、2000μふるい上は粉
砕して再びふるい分けた。得られた顆粒品の性状
は第１表に示した。第１表に示した様に顆粒品の
カサは、溶成りん肥の40〜50％増しとなつた。
The present invention relates to a method for producing granular dissolved phosphorus fertilizer. In general, dissolved phosphorous fertilizer is hardly soluble in water, but gradually dissolves from the surface due to the action of the soil and plant roots.As the particles become larger and the surface area becomes smaller, the fertilizer becomes less effective. Become. In order to increase the surface area, if the raw material is pulverized during rapid cooling and crushing with the heated molten material, it will easily scatter during fertilization work, resulting in poor workability. On the other hand, if the particles are rapidly cooled and crushed, the surface area and bulk of the particles will become smaller, making uniform fertilization difficult and further impairing the fertilizing effect. Therefore, conventionally, a powder product obtained by pulverizing a rapidly cooled dry product of a heated melted raw material, or a product with a particle size limited to a certain range, is granulated by adding an appropriate binder, and then goes through a drying process. It is being made into granular products that have a high bulk and are difficult to scatter, making them suitable for mechanical fertilization. However, the above conventional technique requires a pulverization step and a drying step, and cannot be said to be an industrially advantageous method. In addition, attempts to make the surface of molten phosphorous fertilizer water-soluble by treating it with phosphoric acid or other acids have been made, for example, by Tokuko Sho.
No. 35-8625, Special Publication No. 29-2472, Japanese Patent Publication No. 1983-
111465, etc., but all of these are compound fertilizers whose surface is coated with water-soluble phosphoric acid, and they are essentially not genuine fertilizers in that they do not retain the performance of the original dissolved phosphoric acid. It is different from the object of the invention. In view of the above, the present inventors have developed a granular solution that omit the pulverization process and drying process, has good workability and fertilizing effect, that is, has high bulk, and is granulated to a desired particle size by binding many primary particles and having a large surface area. As a result of various studies on the manufacturing method of solid phosphorus fertilizer, we found that the purpose could be achieved by adding a specific amount of phosphoric acid at a specific concentration in terms of P 2 O 5 to an unpulverized product of quenched molten phosphorus fertilizer and granulating it. They found this and completed the present invention. That is, in the present invention, the particle size distribution is 1000-2000μ0-5
Weight%, 500~1000μ0.1~30wt%, 260~500μ
3-50% by weight, 149-260μ10-75% by weight, 149μ
It is characterized by spraying phosphoric acid at a concentration of 30 to 65% by weight (calculated as P 2 O 5) of 0.1 to 3% by weight (in terms of P 2 O 5 ) to granulate the melted phosphorous quenched product, which falls within the range of 2 to 25% by weight. This is a method for producing granular dissolved phosphorus fertilizer. The particle size distribution of the quenched molten phosphorus fertilizer product can be changed depending on the crushing conditions, etc., but the particle size during crushing is naturally limited due to the need to increase the citric acid elution rate of the molten phosphorus fertilizer obtained. Ru. The melted phosphorus quenched product used in the present invention is usually produced by mixing phosphate rock with a magnesium silicate mineral such as serpentine or nickel refined slag, heating and melting the mixture, and then rapidly cooling and crushing it with water or/and air. , products whose particle size distribution falls within the above range are not subjected to a special pulverization process. In addition, as for the granulated product, use the dried one as is. Next, the melted phosphorous quenched product is granulated using an ordinary rolling granulator, such as a dish granulator, drum granulator, or vibration granulator, while spraying a phosphoric acid aqueous solution. Grainy. The phosphoric acid to be sprayed is suitably an aqueous solution with a concentration of 30 to 65% by weight, and particularly preferably an aqueous solution of 30 to 60% by weight.In this range, the reaction is rapid for the quenched molten phosphoric acid product, and the particles are mutually The particles are aggregated and granulated to the desired size. In addition, the citric acid dissolution rate of the granulated product is fast, and the water-soluble phosphoric acid content is 1% by weight (calculated as P 2 O 5 ).
It can be adjusted to the following and maintain the original properties of molten phosphorus fertilizer. The appropriate amount of the above phosphoric acid aqueous solution to be added is 0.1 to 3% by weight calculated as P 2 O 5 to the quenched molten phosphorus fertilizer, and within this range, granular molten phosphorus fertilizer with a particle size of 2000μ or less is added. obtained, and does not require a drying step after granulation. This is because some of the water in the added phosphoric acid aqueous solution is taken up by the crystallized water of di- or tri-phosphoric acid lime (magnesium) and evaporation due to the heat of reaction causes the granulation to remain in a substantially dry state immediately after granulation. This is thought to be due to the fact that it can be obtained. Although it varies depending on the concentration of phosphoric acid used, if the amount added is usually greater than 3% by weight, the particles immediately after granulation will not pass through a 2000μ sieve in a wet state, or
Although the surface is dry, if the product is stored tightly in a polyethylene bag for about a day and night, dew condenses on the inside of the bag, and granulated products in such a state are generally undesirable because the dissolution rate of citric acid is slow. Also, the amount of phosphoric acid aqueous solution added is 0.1
If it is less than % by weight, the granulation effect will be small and a granular product will not be obtained. Then, after granulation, it is preferably sieved to a desired particle size. The particle size of granules is generally suitable in the range of 500 to 2000μ, and granules larger than 2000μ are crushed, and those smaller than 500μ are returned to the original raw material. This is because molten phosphorus fertilizer tends to be unevenly spread when the particle size varies widely, and the official standard stipulates the particle size to be 2000μ or less. This is to improve the quality of fertilizer and to prevent classification when blending with other granulated fertilizers. Thus, according to the present invention, it has a high bulk, dustproof property,
It has a good texture and spreadability, and has the inherent characteristics of molten phosphorus fertilizer, i.e., water-soluble phosphoric acid content of 1% by weight or less (calculated as P 2 O 5 ), and the dissolution rate with citric acid is the same as or higher than that of general molten phosphorus fertilizer. Granular molten phosphorous fertilizer retaining the above properties can be produced industrially very easily. or,
The granular dissolved phosphorous fertilizer obtained by the present invention includes:
High PH due to elution of lime and magnesium when water is added
It also has the characteristic that it is less buffering than a small amount of water-soluble phosphoric acid, and it responds to the recent demands from the industry for a neutral molten phosphorus fertilizer. Regarding the measurement of the physical properties of the target object, the particle size, dust resistance,
Texture and dispersibility were determined by sieving, tactile sensation, and meat limit determination. In addition, various methods have been proposed for measuring the dissolution rate of citric acid, but since there is no established method yet, the present inventors compared the dissolution rate with the molten phosphorus used as a raw material using the following dissolution rate. did. FIG. 1 shows a dissolution rate measuring device. Here, a small piece of absorbent cotton 2 is placed in the lower part of the elution tube 1 as a support layer, and paper pulp 3 is stuffed on top of it to form a flat surface. Accurately weigh 2 g of the analysis sample 4 and drop it there, and begin elution from the eluate container 5 using a 2% by weight citric acid aqueous solution 6 at a temperature of 10°C. Use 750 ml of the 2% by weight citric acid aqueous solution, and adjust the dropping rate using the dropping rate adjustment knob 7 so that the solution will be completely penetrated in 30 minutes. The dissolution rate is determined by measuring the phosphoric acid content in the aqueous solution in the receiver 8, and is expressed as a dissolution rate (%) using the following formula. Elution rate (%) = a x 100/b a: Content of soluble phosphoric acid (wt%) in the granulated granulated molten phosphorus b: Soluble phosphoric acid in the molten phosphate used as a raw material Content (% by weight) The present invention will be specifically described below with reference to Examples. Examples 1 to 4 and Comparative Examples 1 to 6 Dissolved phosphorus fertilizer (1000 to 2000μ0.7% by weight, 500 to
1000μ29.0wt%, 260~500μ42.5wt%, 149
~260μ21.0wt%, 149μ or less 5.8wt%, umbrella
0.650/Kg) with a predetermined amount of each phosphoric acid solution with a concentration of 5 to 75% by weight was added in the form of a mist, granulated with a rotary plate type granulator, and immediately opened to 2000 μ and 500 μg.
The product was sieved through a μ sieve, and the product had a particle size in the range of 2000μ to 500μ, and was packed in a plastic bag. The material under the 500μ sieve was returned to the original dissolved phosphorus, and the material above the 2000μ sieve was crushed and sieved again. The properties of the obtained granules are shown in Table 1. As shown in Table 1, the bulk of the granular product was 40 to 50% larger than that of the molten phosphorus fertilizer.
【表】
実施例５〜８及び比較例７〜８
溶成りん肥（1000〜2000μ０重量％、500〜
1000μ0.2重量％、260〜500μ4.0重量％、149〜
260μ72.3重量％、149μ以下23.5重量％、カサ
0.693／Kg）に40重量％のリん酸液を霧状に所
定量添加しながら、回転ドラム造粒機で造粒し、
以後実施例１の場合と同様に処理した。得られた
顆粒品の性状を第２表に示した。第２表からも明
らかな様に、顆粒品のカサは溶成りん肥の40〜85
％増しになり、リん酸の添加量によつて、カサお
よび粒度分布が変る事が明白である。[Table] Examples 5 to 8 and Comparative Examples 7 to 8 Dissolved phosphorus fertilizer (1000 to 2000μ0% by weight, 500 to
1000μ0.2wt%, 260~500μ4.0wt%, 149~
260μ 72.3% by weight, 149μ or less 23.5% by weight, umbrella
0.693/Kg) and granulated with a rotating drum granulator while adding a predetermined amount of 40% by weight phosphoric acid solution in the form of mist.
Thereafter, the same treatment as in Example 1 was carried out. The properties of the obtained granules are shown in Table 2. As is clear from Table 2, the bulk of the granule product is 40 to 85
It is clear that the bulk and particle size distribution change depending on the amount of phosphoric acid added.
【表】
実施例５〜８及び比較例７〜８の製品の外観
は、いずれも乾燥状の顆粒で、水溶性リん酸の含
有量はいずれも１重量％以下であつた。[Table] The products of Examples 5 to 8 and Comparative Examples 7 to 8 had the appearance of dry granules, and the content of water-soluble phosphoric acid was 1% by weight or less.
第１図は、溶出率測定装置を示す略図である。
１……溶出管、２……脱脂綿、３……紙パル
プ、４……分析試料、５……溶出液容器、６……
クエン酸水溶液、７……滴下速度調節用コツツ
ク、８……受器。
FIG. 1 is a schematic diagram showing a dissolution rate measuring device. 1...Elution tube, 2...Absorbent cotton, 3...Paper pulp, 4...Analysis sample, 5...Eluate container, 6...
Citric acid aqueous solution, 7... Tip for adjusting dropping speed, 8... Receiver.
Claims (1)
〜1000μ0.1〜30重量％、260〜500μ３〜50重量
％、149〜260μ10〜75重量％、149μ以下２〜25
重量％の範囲に入る溶成りん肥急冷品に、0.1〜
３重量％（P2O5換算）の濃度30〜65重量％リん
酸を噴霧して造粒することを特徴とする顆粒状溶
成りん肥の製造方法。1 Particle size distribution is 1000-2000μ0-5% by weight, 500
~1000μ0.1~30wt%, 260~500μ3~50wt%, 149~260μ10~75wt%, 149μ or less 2~25
For melted phosphorus quenched products that fall within the range of weight%, 0.1~
A method for producing granular dissolved phosphorous fertilizer, which comprises spraying and granulating phosphoric acid at a concentration of 30 to 65 % by weight (in terms of P2O5 ).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8276481A JPS57200279A (en) | 1981-05-30 | 1981-05-30 | Manufacture of granular fused phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8276481A JPS57200279A (en) | 1981-05-30 | 1981-05-30 | Manufacture of granular fused phosphate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57200279A JPS57200279A (en) | 1982-12-08 |
| JPS6131079B2 true JPS6131079B2 (en) | 1986-07-17 |
Family
ID=13783501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8276481A Granted JPS57200279A (en) | 1981-05-30 | 1981-05-30 | Manufacture of granular fused phosphate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57200279A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02267178A (en) * | 1989-04-05 | 1990-10-31 | Minamikiyuushiyuu Kagaku Kogyo Kk | Fused phosphate fertilizer and preparation thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5087863A (en) * | 1973-12-13 | 1975-07-15 | ||
| JPS5622839A (en) * | 1979-07-31 | 1981-03-04 | Nat Jutaku Kenzai | Gableside roof truss device |
| JPS57165027A (en) * | 1981-04-06 | 1982-10-09 | Toyo Soda Mfg Co Ltd | Method for granulating basic fertilizer |
-
1981
- 1981-05-30 JP JP8276481A patent/JPS57200279A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5087863A (en) * | 1973-12-13 | 1975-07-15 | ||
| JPS5622839A (en) * | 1979-07-31 | 1981-03-04 | Nat Jutaku Kenzai | Gableside roof truss device |
| JPS57165027A (en) * | 1981-04-06 | 1982-10-09 | Toyo Soda Mfg Co Ltd | Method for granulating basic fertilizer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57200279A (en) | 1982-12-08 |
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