JPH0757688B2 - Magnesia coated with potassium oxide and method for producing the same - Google Patents
Magnesia coated with potassium oxide and method for producing the sameInfo
- Publication number
- JPH0757688B2 JPH0757688B2 JP2210450A JP21045090A JPH0757688B2 JP H0757688 B2 JPH0757688 B2 JP H0757688B2 JP 2210450 A JP2210450 A JP 2210450A JP 21045090 A JP21045090 A JP 21045090A JP H0757688 B2 JPH0757688 B2 JP H0757688B2
- Authority
- JP
- Japan
- Prior art keywords
- magnesia
- potassium
- potassium oxide
- producing
- coated
- 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 - Fee Related
Links
Landscapes
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Fertilizers (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はマグネシアを利用した農業用資材の長期間の崩
壊性維持及びマグネシアの長期保存中の固結を防ぐと共
に、耐火物マグネシアの固結時間調整可能とする、酸化
カリウム被覆マグネシア及びその製造方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention maintains long-term disintegration of agricultural materials using magnesia and prevents solidification of magnesia during long-term storage, and solidification of refractory magnesia. The present invention relates to potassium oxide-coated magnesia and a method for producing the same, which can be adjusted in time.
従来、肥料用としてのマグネシアを造粒すると、造粒後
の保存期間中に固結してしまい、使用時に散布しても水
中並びに土壌中で崩壊しなくなるが、その原因を調べて
みると、空気中の水分との水和反応によりマグネシウム
水和物（例えば水酸化マグネシウム）が容易に生成する
ことに起因しており、そのために崩壊性が著しく低下す
るという問題点があった。これを第２図で説明すると崩
壊性の低いマグネシアほどＸ線の水酸化マグネシウム解
析強度が高く示されており、これにより、上記固結の原
因が水和反応にもとづくものであることが確認される。Conventionally, when granulating magnesia for fertilizer, it solidifies during the storage period after granulation and does not disintegrate in water and soil even when sprayed at the time of use, but when examining the cause, This is because magnesium hydrate (for example, magnesium hydroxide) is easily produced by a hydration reaction with water in the air, which causes a problem that the disintegration property is significantly reduced. This is illustrated in FIG. 2, which shows that the less disintegratable magnesia has a higher X-ray analysis intensity of magnesium hydroxide, which confirms that the cause of the above-mentioned solidification is based on the hydration reaction. It
また、溶鋼取り鍋の耐火断熱材の層が積層形成されてい
るが、その積層成形中にマグネシアの固結時間が早いた
めその成形作業上困難をきたしていた。Further, layers of the refractory heat insulating material of the molten steel ladle are formed in layers, but the forming time of magnesia is short during the lamination forming, which causes difficulty in the forming operation.
この問題点を解決するために塩化カルシウムの混合（特
開昭60−141694）、造粒材としてのリグニンの選定（特
開昭61−117137）、乾燥温度の調整（特開昭64−5933）
等が提案されている。In order to solve this problem, mixing of calcium chloride (JP-A-60-141694), selection of lignin as a granulating material (JP-A-61-117137), adjustment of drying temperature (JP-A-64-5933)
Etc. have been proposed.
しかしながら、上記従来の方法にあって、塩化カルシウ
ムを混合すると吸湿が促進され水和反応が容易になり経
時変化により固結し、リグニンを選定して用いる方法で
は製紙技術が進歩することによりリグニン自体の入手が
不可能となる事態も予測される。さらに乾燥温度の調整
は低温で乾燥するので大量の風量を必要とし設備も大型
化となるためコストアップに繋がる。However, in the above-mentioned conventional method, when calcium chloride is mixed, moisture absorption is promoted, the hydration reaction is facilitated, and it solidifies due to aging, and in the method of selecting and using lignin, lignin itself is improved by the progress of papermaking technology. It is also predicted that it will be impossible to obtain. Furthermore, since the drying temperature is adjusted at a low temperature, a large amount of air volume is required, and the equipment becomes large, which leads to an increase in cost.
また、マグネシアを原料として長期保存する場合、港の
ような湿度の高い地方では保存期間中に空気中の水分と
水和反応が進み、大塊になるほど固結が発生し原料とし
て価値がなくなる。そのため防湿用の袋を用いたり、湿
度の少ない保管場所を選ばなければならに負担があり余
分な経費を必要としている。Further, when magnesia is stored as a raw material for a long period of time, in a high humidity region such as a harbor, a hydration reaction with moisture in the air progresses during the storage period, and the larger the mass, the more solidification occurs and the less valuable the raw material. Therefore, it is burdensome and extra cost is required to use a moisture-proof bag or to select a storage location with low humidity.
さらに、耐火物の成形には、水の量を増やすなどの工夫
が必要であり、このことにより多大な乾燥時間並びに乾
燥費用を要していた。Further, in forming the refractory, it is necessary to devise a method such as increasing the amount of water, which requires a great amount of drying time and cost.
本発明は上述のごとく従来の問題点を解決し、保存中に
あっては長期に亘り空気中の水分に対し水和反応を防止
し、安定した酸化カリウム被覆マグネシア及びその製造
方法を提供することを目的とするものである。The present invention solves the conventional problems as described above, and provides a stable potassium oxide-coated magnesia and a method for producing the same, which prevents a hydration reaction against moisture in the air for a long time during storage. The purpose is.
本発明によれば、上記目的は、 マグネシア表面に酸化カリウムを被覆させる、ことによ
り達成される。According to the present invention, the above object is achieved by coating the surface of magnesia with potassium oxide.
また、本発明によれば、上記酸化カリウム被覆マグネシ
アは、マグネシアにカリウム化合物水溶液を混合し、こ
れを乾燥した後焼成することにより得られる。Further, according to the present invention, the above-described magnesia coated with potassium oxide is obtained by mixing magnesia with an aqueous solution of a potassium compound, drying the mixture, and then firing the mixture.
上述のごとくの本発明にあっては、マグネシアに酸化カ
リウムを得る手段の一つとして、例えば、微量の硝酸カ
リウムを含む水溶液はマグネシア中への混合により該マ
グネシアに対し均等に拡散する。しかる後、好ましい温
度として300℃で乾燥し、600℃の雰囲気で焼成する。In the present invention as described above, as one means for obtaining potassium oxide in magnesia, for example, an aqueous solution containing a trace amount of potassium nitrate diffuses evenly into magnesia when mixed into magnesia. After that, it is dried at a preferable temperature of 300 ° C. and baked in an atmosphere of 600 ° C.
上記酸化カリウムは水酸基吸着を疎外する効果があり、
肥料用に用いた場合には、水和反応を抑制し安定した崩
壊性を維持できる。また、マグネシアを用いた耐火物に
採用した場合には、成形時間のコントロールが可能とな
る。The potassium oxide has the effect of alienating hydroxyl group adsorption,
When used as a fertilizer, it can suppress hydration and maintain stable disintegration. Further, when adopted as a refractory material using magnesia, the molding time can be controlled.
ここで十分な水和反応抑制効果を得ようとするならば、
硝酸カリウム添加量、マグネシアに対し0.1重量％以上
を必要とする。これを水溶液としてマグネシア中に混合
することにより、マグネシアの粒子の隅々まで拡散す
る。そして、これを高温の雰囲気の中でマグネシアの表
面に酸化カリウムの層を被覆形成することにより、大気
中の水分との水和反応抑制効果を見いだすものである。If you want to obtain a sufficient hydration suppression effect here,
The amount of potassium nitrate added must be 0.1% by weight or more based on magnesia. By mixing this as an aqueous solution in magnesia, it spreads to every corner of the magnesia particles. Then, the surface of magnesia is coated with a layer of potassium oxide in a high temperature atmosphere to find the effect of suppressing the hydration reaction with moisture in the atmosphere.
なお、本発明では、マグネシアは軽焼マグネシウムでも
重焼マグネシウムでもよい。また、カリウム化合物とし
ては上記硝酸カリウムの他、塩化カリウム、硫酸カリウ
ムも使用可能である。In the present invention, magnesia may be light burned magnesium or heavy burned magnesium. In addition to the above potassium nitrate, potassium chloride and potassium sulfate can be used as the potassium compound.
（実験例） 本発明にしたがい、マグネシウム4kgに、硝酸カリウム4
gを500ccの水溶液に溶かした硝酸カリウム水溶液を加
え、これを十分に混合した後、300℃の雰囲気で約30分
間乾燥した後600℃で焼成し、冷却後200℃の飽和水蒸気
に２時間接触させて得られたものを試作品とした。(Experimental Example) According to the present invention, 4 kg of magnesium and 4 parts of potassium nitrate were added.
An aqueous potassium nitrate solution prepared by dissolving g in an aqueous solution of 500 cc was added, thoroughly mixed, dried in an atmosphere of 300 ° C. for about 30 minutes, baked at 600 ° C., cooled, and then contacted with saturated steam at 200 ° C. for 2 hours. The obtained product was used as a prototype.
（比較例） 本発明による上記試作品との比較を行うために、マグネ
シア4kgを600℃の雰囲気で焼成し、冷却後200℃の飽和
水蒸気に２時間接触させて得られたものを比較品とし
た。(Comparative Example) In order to make a comparison with the prototype according to the present invention, 4 kg of magnesia was fired in an atmosphere of 600 ° C., cooled, and then brought into contact with saturated steam of 200 ° C. for 2 hours as a comparative product. did.
かくして得られた上記試作品をマグネシアの水和反応性
を確認するため、ヘリウム気流中で室温から昇温速度毎
分５℃で温度を増加させた場合の時間（温度）に対する
マグネシアの表面に吸着した水の脱離挙動をガス質量分
析計により測定した。この装置では、ヘリウムはマグネ
シアとは反応しないので、マグネシアはその加熱温度に
より、 Mg（OH）２→MgO＋H2O の反応を示す。すなわち、本装置では脱離された上記の
水の量を測定したものである。この結果を第１図により
説明する。In order to confirm the hydration reactivity of magnesia, the above-obtained prototype was adsorbed on the surface of magnesia with respect to the time (temperature) when the temperature was increased from room temperature to 5 ° C per minute in a helium gas stream. The desorption behavior of the formed water was measured by a gas mass spectrometer. In this device, helium does not react with magnesia, so magnesia exhibits a reaction of Mg (OH) 2 → MgO + H 2 O depending on its heating temperature. That is, in this device, the amount of desorbed water is measured. The result will be described with reference to FIG.
なお、同図において、時間（横軸）と上記ヘリウム気流
の温度（右縦軸）との関係は、図中の一転鎖線で示さ
れ、例えば90分経過時には約500℃であることを示して
いる。In the figure, the relationship between time (horizontal axis) and the temperature of the helium gas stream (right vertical axis) is shown by the chain line in the figure, and indicates that it is about 500 ° C after 90 minutes have passed, for example. There is.
図中の上部MgOと付記された実線は硝酸カリウム無添加
の上記比較品の、下部でＫ（1wt％）−MgOと付記された
実線は硝酸カリウム添加の試作品の、それぞれマグネシ
ア表面に付着している水の脱離挙動を昇温脱離（TPD）
法によりその程度を左縦軸（PH2O（a.u.））で示してい
る。両者を比較すると比較品には300℃付近、400℃付
近、そして800℃に明確な水の離脱が見られるが、試作
品にはそれが全く見られず、カリウム化合物添加により
マグネシアの水和反応が抑制されたことを示している。In the figure, the solid line attached to the upper MgO is attached to the magnesia surface of the above comparative product without addition of potassium nitrate, and the solid line attached to the lower part of K (1wt%)-MgO is the prototype of potassium nitrate added. Thermal desorption (TPD) for desorption behavior of water
According to the method, the degree is shown on the left vertical axis (PH 2 O (au)). Comparing the two, in the comparative product, clear desorption of water was observed at around 300 ° C, 400 ° C, and 800 ° C, but this was not seen at all in the prototype, and the hydration reaction of magnesia by the addition of the potassium compound was observed. Is suppressed.
これらの結果により硝酸カリウムをマグネシア上で酸化
させることによって生成した酸化カリウムは、マグネシ
アに対する著しい水和反応抑制効果をもつことがわか
る。These results show that potassium oxide produced by oxidizing potassium nitrate on magnesia has a remarkable effect of suppressing hydration reaction on magnesia.
以上のごとくの本発明にもとづくカリウム化合物により
表面改質したマグネシアを農業用肥料の原料として使用
すると、保存期間中に空気中存在する水分に影響される
ことなく、マグネシアの水和反応が抑制され長期間に亘
って崩壊性を維持できると共に、原料としても安定した
状態で何処でも保管できることとなった。As described above, when magnesia surface-modified with a potassium compound according to the present invention is used as a raw material for agricultural fertilizers, the hydration reaction of magnesia is suppressed without being affected by the moisture present in the air during the storage period. The disintegration property can be maintained for a long period of time, and the raw material can be stored anywhere in a stable state.
さらに耐火物等のマグネシアを用いた積層を固結時間に
係りなく形成することが可能となった。Furthermore, it became possible to form a layer of magnesia such as refractory material regardless of the setting time.
第１図は本発明の試作品と本発明によらない比較品とを
比較しつつ水和反応を昇温脱離法にて示す図、第２図は
水酸化マグネシウムの崩壊率とＸ線解析強度との関係を
示す図である。FIG. 1 is a diagram showing a hydration reaction by a temperature programmed desorption method while comparing a prototype of the present invention and a comparative product not according to the present invention, and FIG. 2 is a decay rate of magnesium hydroxide and an X-ray analysis. It is a figure which shows the relationship with intensity.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０９Ｃ 1/02 ＰＡＣ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication C09C 1/02 PAC
Claims (4)
ることとする酸化カリウム被覆マグネシア。1. A potassium oxide-coated magnesia obtained by coating the surface of magnesia with potassium oxide.
し、これを乾燥した御焼成することとする酸化カリウム
被覆マグネシアの製造方法。2. A method for producing potassium oxide-coated magnesia, which comprises mixing an aqueous solution of a potassium compound with magnesia, and drying and baking the mixture.
マグネシウムであることとする請求項（２）に記載の酸
化カリウム被覆マグネシアの製造方法。3. The method for producing potassium oxide-coated magnesia according to claim 2, wherein the magnesia is light burned magnesium or heavy burned magnesium.
ウム、硫酸カリウム等のカリウム化合物であることとす
る請求項（２）に記載の酸化カリウム被覆マグネシアの
製造方法。4. The method for producing potassium oxide-coated magnesia according to claim 2, wherein the potassium compound is a potassium compound such as potassium chloride, potassium nitrate or potassium sulfate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2210450A JPH0757688B2 (en) | 1990-08-10 | 1990-08-10 | Magnesia coated with potassium oxide and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2210450A JPH0757688B2 (en) | 1990-08-10 | 1990-08-10 | Magnesia coated with potassium oxide and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0497909A JPH0497909A (en) | 1992-03-30 |
| JPH0757688B2 true JPH0757688B2 (en) | 1995-06-21 |
Family
ID=16589533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2210450A Expired - Fee Related JPH0757688B2 (en) | 1990-08-10 | 1990-08-10 | Magnesia coated with potassium oxide and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0757688B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9403041B2 (en) | 2004-11-09 | 2016-08-02 | Cupron Inc. | Methods and materials for skin care |
-
1990
- 1990-08-10 JP JP2210450A patent/JPH0757688B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0497909A (en) | 1992-03-30 |
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