JPH0228558B2 - KEISANKARIHIRYONOSEIZOHOHO - Google Patents
KEISANKARIHIRYONOSEIZOHOHOInfo
- Publication number
- JPH0228558B2 JPH0228558B2 JP52683A JP52683A JPH0228558B2 JP H0228558 B2 JPH0228558 B2 JP H0228558B2 JP 52683 A JP52683 A JP 52683A JP 52683 A JP52683 A JP 52683A JP H0228558 B2 JPH0228558 B2 JP H0228558B2
- Authority
- JP
- Japan
- Prior art keywords
- potassium
- firing
- potassium silicate
- pulverized coal
- temperature
- 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 - Lifetime
Links
- 238000010304 firing Methods 0.000 claims description 22
- 239000004111 Potassium silicate Substances 0.000 claims description 20
- 235000019353 potassium silicate Nutrition 0.000 claims description 20
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 20
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 20
- 239000003337 fertilizer Substances 0.000 claims description 12
- 239000003245 coal Substances 0.000 claims description 10
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 10
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 10
- 235000011151 potassium sulphates Nutrition 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000007858 starting material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 18
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 8
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 238000010828 elution Methods 0.000 description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000001354 calcination Methods 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 2
- 229910001950 potassium oxide Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000003112 potassium compounds Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Fertilizers (AREA)
Description
【発明の詳細な説明】
本発明は硫酸カリウムをカリ源としてク溶性の
珪酸カリ肥料を製造する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a potassium silicate fertilizer using potassium sulfate as a potassium source.
ク溶性の珪酸カリ肥料は水に溶解せず植物の根
から排泄されるクエン酸によつて溶解されるので
雨水による流亡がなく、肥持ちが良いという利点
がある。近年この種のク溶性の珪酸カリ肥料を製
造するため、火力発電所等の微粉炭燃焼炉から発
生する排ガス中のダスト、すなわちフライアツシ
ユと、カリ源とを混合して焼成炉で焼成する方法
が実施されつつある。この場合、カリ源として
は、一般的に炭酸カリウム、水酸化カリウムが使
用されている。炭酸カリウム、水酸化カリウムは
焼成によつて次式の如く反応してク溶性の珪酸カ
リウムを生成する。 The citric acid-soluble potassium silicate fertilizer does not dissolve in water but is dissolved by citric acid excreted from the roots of plants, so it has the advantage of not being washed away by rainwater and having a long shelf life. In recent years, in order to produce this type of soluble potassium silicate fertilizer, a method has been implemented in which dust in the exhaust gas generated from pulverized coal combustion furnaces such as thermal power plants, or fly ash, is mixed with a potassium source and fired in a kiln. It is being done. In this case, potassium carbonate and potassium hydroxide are generally used as the potassium source. Potassium carbonate and potassium hydroxide react as shown in the following formula upon calcination to produce potassium silicate which is soluble in potassium silicate.
(a) K2CO3→K2O＋CO2
K2O＋nSiO2→K2O・nSiO2
(b) 2KOH→K2O＋H2O
K2O＋nSiO2→K2O・nSiO2
すなわち、各カリウム化合物が焼成によつて分
解されて酸化カリウムを生じ、この酸化カリウム
がフライアツシユ中に含まれる二酸化珪素と反応
してク溶性の珪酸カリウムが製造されるのであ
る。(a) K 2 CO 3 →K 2 O＋CO 2 K 2 O＋nSiO 2 →K 2 O・nSiO 2 (b) 2KOH→K 2 O＋H 2 O K 2 O＋nSiO 2 →K 2 O・nSiO 2 In other words, each potassium compound is The fly ash is decomposed to produce potassium oxide, which reacts with the silicon dioxide contained in the fly ash to produce soluble potassium silicate.
しかしながら、この方法では炭酸カリウムや水
酸化カリウムの分解のため焼成温度を800〜1000
℃とする必要があるが、焼成温度が高くなるほど
クエン酸による溶出率が低下することが知られて
おり、したがつて、製造された珪酸カリウムは植
物に利用されにくくなる欠点があつた。 However, this method requires a firing temperature of 800 to 1000 to decompose potassium carbonate and potassium hydroxide.
℃, but it is known that the higher the firing temperature, the lower the rate of elution by citric acid, which has the disadvantage that the produced potassium silicate is less likely to be used by plants.
またカリ源として硫酸カリウムを用いる方法も
提案されている（例えば特開昭55―20218号公報
参照）。この方法では次の如く反応する。 A method using potassium sulfate as a potassium source has also been proposed (see, for example, Japanese Patent Application Laid-Open No. 1983-20218). In this method, the reaction is as follows.
K2SO4→K2O＋SO3
K2O＋nSiO2→K2O・nSiO2
しかしながら、この方法では硫酸カリウムの分
解のためさらに高い焼成温度を必要とし、しかも
発生する三酸化硫黄が腐蝕性を有する欠点があつ
た。 K 2 SO 4 →K 2 O＋SO 3 K 2 O＋nSiO 2 →K 2 O・nSiO 2However , this method requires a higher firing temperature to decompose the potassium sulfate, and the sulfur trioxide generated is corrosive. There were flaws.
したがつて、本発明の目的は、焼成温度を低く
してクエン酸による溶出率の高い珪酸カリ肥料の
製造方法を提供することにある。 Therefore, an object of the present invention is to provide a method for producing a potassium silicate fertilizer that has a high elution rate with citric acid by lowering the firing temperature.
本発明によれば、出発原料としてフライアツシ
ユと硫酸カリウムと微粉炭とを用い、それらの原
料を混合し、造粒し、乾燥し、そして焼成炉で焼
成する珪酸カリ肥料の製造方法において、その焼
成工程において微粉炭が還元性雰囲気を形成し、
焼成温度が500度Ｃないし800度Ｃである。 According to the present invention, in the method for producing potassium silicate fertilizer using fly ash, potassium sulfate, and pulverized coal as starting materials, mixing these raw materials, granulating, drying, and firing in a firing furnace, the firing step The pulverized coal forms a reducing atmosphere in
The firing temperature is 500°C to 800°C.
したがつて硫酸カリウムは次式の如く反応す
る。 Therefore, potassium sulfate reacts as shown in the following equation.
K2SO4＋（１／２）Ｃ→K2O＋SO2
＋（１／２）CO2
K2O＋nSiO2→K2O・nSiO2
この反応は比較的低い温度、約500〜800℃で進
行するので、焼成温度を低くしてクエン酸による
溶出率の高い珪酸カリ肥料を製造することができ
る。また発生する二酸化硫黄は通常の排煙脱硫装
置で充分に処理することができる。 K 2 SO 4 + (1/2) C → K 2 O + SO 2 + (1/2) CO 2 K 2 O + nSiO 2 → K 2 O・nSiO 2This reaction proceeds at a relatively low temperature, about 500-800℃ Therefore, it is possible to produce a potassium silicate fertilizer with a high elution rate by citric acid by lowering the firing temperature. Further, the generated sulfur dioxide can be sufficiently treated with a normal flue gas desulfurization equipment.
出発物質として微粉炭を用いる珪酸カリ肥料の
製造技術は例えば特開昭55―104987号公報に記載
されている。しかしながら、この公知の技術では
焼成温度は900〜1100℃であり、このように高い
温度を得るための熱源として微粉炭を用いたもの
であり、やはり前述の如き欠点は避け得なかつ
た。 A technique for producing potassium silicate fertilizer using pulverized coal as a starting material is described, for example, in JP-A-55-104987. However, in this known technique, the firing temperature is 900 to 1100°C, and pulverized coal is used as a heat source to obtain such a high temperature, so the drawbacks mentioned above are unavoidable.
本発明によれば、微粉炭を還元剤として用い、
以て硫酸カリウムから生ずる三酸化硫黄が二酸化
硫黄に還元されるため処理が容易で公害問題を生
ぜしめないこと、および比較的に低温で反応を生
ぜしめ得るという効果を奏することができる。 According to the present invention, using pulverized coal as a reducing agent,
As a result, sulfur trioxide generated from potassium sulfate is reduced to sulfur dioxide, so that the treatment is easy and does not cause pollution problems, and the reaction can be carried out at a relatively low temperature.
次に本発明を実施する装置に関して図面に従つ
て説明する。 Next, an apparatus for implementing the present invention will be described with reference to the drawings.
図において、Ａはフライアツシユ、Ｂは硫酸カ
リウム、Ｃは微粉炭、Ｄは造粒するために必要な
水、アルコール廃棄液等の液体のバインダーが収
容されているホツパであり、これらの原料はそれ
ぞれフイーダ１，２，３，４を介して所定の配合
比で混合機５に供給される。これらの原料を混合
機５にて充分に混合した後、造粒機６に送り直径
２〜５mm程度に造粒する。さらに、造粒した原料
は乾燥機７に送つて乾燥する。乾燥に使用する熱
ガスの温度は300〜400℃、乾燥時間は10分〜20分
間程度が適当である。そして、乾燥した原料を焼
成炉８に送り還元性雰囲気下にて500〜800℃で焼
成する。焼成炉８の形式は、ロータリーキルン、
流動炉、電気炉等種々のものが採用できる。この
ようにして焼成されることにより、硫酸カリウム
は前述の如く分解して酸化カリウムとなり、さら
にフライアツシユ中の二酸化珪素と反応してク溶
性の珪酸カリウムとなる。そして焼成によつて生
じた排ガスは、二酸化硫黄、二酸化炭素、一酸化
炭素等からなり三酸化硫黄はほとんど含まれな
い。生成された珪酸カリウムは製品として焼成炉
８より取出し、排ガスは二次燃焼室９に送つてこ
こで空気を加えて再燃させる。二次燃焼室９は図
に示すように焼成炉８と分離されたものでもよ
く、あるいは焼成炉８と一体化されたものでもよ
い。この再燃焼されたガスは、乾燥機７に送つて
乾燥機７の熱源として利用し、さらにガス洗浄装
置１０に送つて硫黄酸化物を除去した後大気に放
出する。なお１１は焼成炉８のためのバーナ、１
２は給気ブロアー、１３は二次燃焼室９のための
補助バーナである。 In the figure, A is fly ash, B is potassium sulfate, C is pulverized coal, and D is a hopper containing liquid binders such as water and alcohol waste liquid necessary for granulation. It is supplied to the mixer 5 via feeders 1, 2, 3, and 4 at a predetermined mixing ratio. After thoroughly mixing these raw materials in a mixer 5, they are sent to a granulator 6 and granulated to a diameter of about 2 to 5 mm. Furthermore, the granulated raw material is sent to a dryer 7 and dried. The appropriate temperature of the hot gas used for drying is 300 to 400°C, and the drying time is approximately 10 to 20 minutes. The dried raw material is then sent to a firing furnace 8 and fired at 500 to 800°C in a reducing atmosphere. The type of firing furnace 8 is a rotary kiln,
Various types of furnaces such as fluidized fluidized furnaces and electric furnaces can be used. By firing in this manner, the potassium sulfate decomposes into potassium oxide as described above, and further reacts with silicon dioxide in the fly ash to become soluble potassium silicate. The exhaust gas generated by firing consists of sulfur dioxide, carbon dioxide, carbon monoxide, etc., and contains almost no sulfur trioxide. The produced potassium silicate is taken out as a product from the calcining furnace 8, and the exhaust gas is sent to the secondary combustion chamber 9 where air is added to reburn it. The secondary combustion chamber 9 may be separated from the firing furnace 8 as shown in the figure, or may be integrated with the firing furnace 8. This re-burned gas is sent to the dryer 7 to be used as a heat source for the dryer 7, and further sent to the gas cleaning device 10 to remove sulfur oxides and then released into the atmosphere. Note that 11 is a burner for the firing furnace 8;
2 is a supply air blower, and 13 is an auxiliary burner for the secondary combustion chamber 9.
実施例
図に示す装置を使用して珪酸カリウムを製造し
た。EXAMPLE Potassium silicate was produced using the apparatus shown in the figure.
まず、フイーダ１，２，３，４より、フライア
ツシユ34.5Kg、硫酸カリウム17Kg、石炭粉１Kg、
水６Kgを混合機５に供給し、よく混合した後、造
粒機６に送つて約３mm径の粒に造粒した。この造
粒した原料を乾燥機７に入れ、200℃にて20分間
乾燥した後、焼成炉（電気炉）に入れて、650℃
にて40分間焼成した。その結果、珪酸カリ肥料43
Kgを得ることができた。 First, from feeders 1, 2, 3, and 4, 34.5 kg of fly ash, 17 kg of potassium sulfate, 1 kg of coal powder,
After 6 kg of water was supplied to the mixer 5 and mixed well, it was sent to the granulator 6 and granulated into particles with a diameter of about 3 mm. This granulated raw material was put into the dryer 7 and dried at 200℃ for 20 minutes, then put into a firing furnace (electric furnace) and heated to 650℃.
Baked for 40 minutes. As a result, potassium silicate fertilizer 43
I was able to get Kg.
ところで焼成炉８より取出された珪酸カリ肥料
のクエン酸に対する溶出率は60％であり、これは
従来の方法によつて得られる珪酸カリウムの溶出
率45％に比べてはるかに高い値である。 By the way, the elution rate of the potassium silicate fertilizer taken out from the firing furnace 8 with respect to citric acid is 60%, which is much higher than the elution rate of potassium silicate of 45% obtained by the conventional method.
以上説明したように、本発明によれば、比較的
低い焼成温度で製造することができるのでクエン
酸の溶出率が高い珪酸カリ肥料を製造することが
できる。また排ガス中に三酸化硫黄をほとんど含
まないので、排気ガスの処理が容易である。 As explained above, according to the present invention, it is possible to produce a potassium silicate fertilizer with a high citric acid elution rate because it can be produced at a relatively low calcination temperature. Furthermore, since the exhaust gas contains almost no sulfur trioxide, it is easy to treat the exhaust gas.
図は本発明を実施するための装置を示すフロー
シートである。
１，２，３，４…フイーダ、５…混合機、６…
造粒機、７…乾燥機、８…焼成炉、９…二次燃焼
室、１０…ガス洗浄機、１１…バーナ、１２…給
気ブロアー、１３…補助バーナ。
The figure is a flow sheet showing an apparatus for carrying out the invention. 1, 2, 3, 4... feeder, 5... mixer, 6...
Granulator, 7... Dryer, 8... Calcining furnace, 9... Secondary combustion chamber, 10... Gas washer, 11... Burner, 12... Air supply blower, 13... Auxiliary burner.
Claims (1)
ムと微粉炭とを用い、それらの原料を混合し、造
粒し、乾燥し、そして焼成炉で焼成する珪酸カリ
肥料の製造方法において、その焼成工程において
微粉炭が還元性雰囲気を形成し、焼成温度が500
度Ｃないし800度Ｃであることを特徴とする珪酸
カリ肥料の製造方法。1. A method for producing potassium silicate fertilizer using fly ash, potassium sulfate, and pulverized coal as starting materials, mixing these materials, granulating them, drying them, and firing them in a kiln, in which the pulverized coal is reduced in the firing process. The firing temperature is 500℃.
A method for producing a potassium silicate fertilizer, characterized in that the temperature is between 800 degrees C and 800 degrees C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52683A JPH0228558B2 (en) | 1983-01-07 | 1983-01-07 | KEISANKARIHIRYONOSEIZOHOHO |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52683A JPH0228558B2 (en) | 1983-01-07 | 1983-01-07 | KEISANKARIHIRYONOSEIZOHOHO |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59128289A JPS59128289A (en) | 1984-07-24 |
| JPH0228558B2 true JPH0228558B2 (en) | 1990-06-25 |
Family
ID=11476209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP52683A Expired - Lifetime JPH0228558B2 (en) | 1983-01-07 | 1983-01-07 | KEISANKARIHIRYONOSEIZOHOHO |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0228558B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS645988A (en) * | 1987-06-29 | 1989-01-10 | Mikio Ezaki | Manufacture of potassium silicate fertilizer from potassium sulfate |
-
1983
- 1983-01-07 JP JP52683A patent/JPH0228558B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59128289A (en) | 1984-07-24 |
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