JP2006027966A - Solidification prevention of magnesium nitrate hexahydrate - Google Patents
Solidification prevention of magnesium nitrate hexahydrate Download PDFInfo
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本発明は、硝酸マグネシウム６水塩の固結防止方法と、このように固結を防止した硝酸マグネシウム６水塩の組成物に関する。 The present invention relates to a method for preventing caking of magnesium nitrate hexahydrate and a composition of magnesium nitrate hexahydrate that prevents caking in this way.
硝酸マグネシウム６水塩は、通常、無色の結晶で、雰囲気中の水分を吸収しやすい性質を持っており、通常、製造から実際の使用に至るまでの一、二か月程度の保管流通期間の間に、温度や湿度の環境の変化によって固結を起こしやすく、最終的に塊状にまで成長する。このように塊状にまで成長すれば、その取り扱いが極めて困難であるのみならず、これを原料として用いる製造工程において、輸送設備や混合、溶解をはじめとする製造設備を破損するおそれがある。更に、近年の化学工業のグローバル化に伴う輸出を考慮すれば、長期保存や保存環境の変化による固結を防止し、使用に際して、取扱いやすい状態を保つことは極めて重要である。 Magnesium nitrate hexahydrate is usually colorless crystals and has the property of easily absorbing moisture in the atmosphere, and usually has a storage and distribution period of about one or two months from production to actual use. In the meantime, it tends to cause consolidation due to changes in the environment of temperature and humidity, and eventually grows up to a lump. Thus, if it grows to a lump shape, the handling will be very difficult, and in the manufacturing process using this as a raw material, there is a possibility of damaging transportation equipment, manufacturing equipment such as mixing and melting. Furthermore, in view of exports associated with the recent globalization of the chemical industry, it is extremely important to prevent long-term storage and consolidation due to changes in the storage environment, and to maintain a state that is easy to handle during use.
従来、食塩を含む種々の無機化学品や有機物質について、炭酸マグネシウムや塩基性炭酸マグネシウムを固結防止剤として用いる固結防止方法が種々、提案されている。例えば、食塩の固結防止方法としては、食塩に１重量％以下の炭酸マグネシウムを添加してなる混合物を調製し、これを食塩に対して０．２〜１０重量％の範囲で添加する方法が知られている（特許文献１参照）。また、食塩にリン酸水素二ナトリウムを噴霧添加した後、炭酸マグネシウム粉末を添加することからなる食塩の固結防止方法も知られている（特許文献２参照）。 Conventionally, various anti-caking methods using magnesium carbonate or basic magnesium carbonate as anti-caking agents have been proposed for various inorganic chemicals and organic substances including salt. For example, as a method for preventing the caking of salt, there is a method of preparing a mixture obtained by adding 1% by weight or less of magnesium carbonate to salt and adding this in the range of 0.2 to 10% by weight with respect to the salt. It is known (see Patent Document 1). Further, a method for preventing solidification of sodium chloride, which comprises adding disodium hydrogen phosphate to sodium chloride and then adding magnesium carbonate powder, is also known (see Patent Document 2).
食塩以外の無機化学品については、表面に炭酸ナトリウム成分を含有する炭酸水素ナトリウムに炭酸マグネシウムを固結防止剤として０．０５〜１重量％の範囲で混合する方法が知られている（特許文献３参照）。同様に、塩化水素吸収剤として用いる炭酸水素ナトリウムの固結防止に関して、炭酸水素ナトリウムと固結防止剤としての塩基性炭酸マグネシウムの平均粒径をそれぞれ５〜５０μｍの範囲にすると共に、炭酸水素ナトリウムに塩基性炭酸マグネシウムを１〜５０重量％の範囲で混合する方法が知られている（特許文献４参照）。このように、炭酸マグネシウムや塩基性炭酸マグネシウムを種々の無機化学品の固結防止剤として用いることは既に知られている。しかし、このように炭酸水素ナトリウムに対して多量の固結防止剤を添加することは、炭酸水素ナトリウム本来の特性を損なうおそれがあり、勿論、炭酸水素ナトリウムを化学原料として用いる場合には、品位の低下が著しく、問題がある。 For inorganic chemicals other than salt, a method is known in which magnesium carbonate is mixed with sodium bicarbonate containing a sodium carbonate component on the surface in the range of 0.05 to 1% by weight as an anti-caking agent (patent document). 3). Similarly, regarding the caking prevention of sodium hydrogen carbonate used as a hydrogen chloride absorbent, the average particle diameters of sodium hydrogen carbonate and basic magnesium carbonate as the caking inhibitor are in the range of 5 to 50 μm, respectively, and sodium hydrogen carbonate There is known a method in which basic magnesium carbonate is mixed in an amount of 1 to 50% by weight (see Patent Document 4). Thus, it is already known to use magnesium carbonate or basic magnesium carbonate as an anti-caking agent for various inorganic chemicals. However, adding a large amount of an anti-caking agent to sodium bicarbonate in this way may impair the original characteristics of sodium bicarbonate. Of course, when sodium bicarbonate is used as a chemical raw material, There is a problem that the decrease in is significant.
上記以外にも、吸湿性無機粉体、例えば、食塩、硫酸アンモニウム、塩化アンモニウム、塩化カリウム等の固結防止のために、焼き明礬（無水硫酸アルミニウムカリウム）を０．１〜５重量％の範囲で添加、混合することが提案されている（特許文献５参照）。 In addition to the above, in order to prevent caking of hygroscopic inorganic powder such as sodium chloride, ammonium sulfate, ammonium chloride, potassium chloride, etc., baked alum (anhydrous potassium aluminum sulfate) is added in the range of 0.1 to 5% by weight. Addition and mixing have been proposed (see Patent Document 5).
更に、硝酸アンモニウムの固結防止方法として、例えば、脂肪族アミン、高級脂肪酸及び炭化水素油を含む混合物を加熱溶融して得られる粉体を固結防止剤として用いる方法（特許文献６参照）や、硝酸アンモニウムにホウ酸を付着させることからなる硝酸アンモニウムの固結防止方法が知られている（特許文献７参照）。また、硝酸ストロンチウムや硝酸バリウムの固結防止のために微粒子ケイ酸を添加、混合する方法が知られている（特許文献８参照）。 Furthermore, as a method for preventing caking of ammonium nitrate, for example, a method using a powder obtained by heating and melting a mixture containing an aliphatic amine, a higher fatty acid and a hydrocarbon oil as a caking preventing agent (see Patent Document 6), A method for preventing caking of ammonium nitrate comprising attaching boric acid to ammonium nitrate is known (see Patent Document 7). Also known is a method of adding and mixing fine particle silicic acid in order to prevent caking of strontium nitrate or barium nitrate (see Patent Document 8).
無機化学品の固結防止のために、有機化合物を固結防止剤として用いる方法も知られている。例えば、亜硝酸ナトリウムにアルギン酸プロピレングリコールエステルやアルギン酸トリエタノールアミンを添加して、亜硝酸ナトリウムの固結を防止する方法が知られている（特許文献９参照）。 A method using an organic compound as an anti-caking agent is also known for preventing caking of inorganic chemicals. For example, a method for preventing caking of sodium nitrite by adding propylene glycol alginate or triethanolamine alginate to sodium nitrite is known (see Patent Document 9).
他方、有機物の固結防止として、アミノ酸を主成分とする飼料添加用造粒物に炭酸マグネシウムのような無機マグネシウム塩を０．１〜５重量％混合する方法が知られている（特許文献１０参照）。 On the other hand, a method of mixing 0.1 to 5% by weight of an inorganic magnesium salt such as magnesium carbonate with a granule for feed addition containing an amino acid as a main component is known as prevention of caking of organic matter (Patent Document 10). reference).
しかし、硝酸マグネシウム６水塩は、結晶水を有するが故に、特に湿気を引き寄せる度合いが高く、著しく吸湿性の無機化学品である。硝酸マグネシウム６水塩は、雰囲気温度が変化した場合において、結晶粒子が荷重を受けたときに、結晶の有する結晶水と吸湿した水分によって結晶粒子間の接触点で溶解、析出を繰返して、液橋を形成し、この液橋が温度や湿度の変化によって固橋となって、結晶粒子間に結合を生じ、このような現象が進行して、塊状物を形成するに至るものと考えられる。 However, magnesium nitrate hexahydrate is a highly hygroscopic inorganic chemical because it has water of crystallization and has a particularly high degree of attracting moisture. Magnesium nitrate hexahydrate is dissolved and precipitated repeatedly at the point of contact between crystal particles by the crystal water and moisture absorbed when the crystal particles are subjected to a load when the ambient temperature changes. It is considered that a bridge is formed, and this liquid bridge becomes a solid bridge due to changes in temperature and humidity, and bonds are formed between crystal grains, and such a phenomenon proceeds to form a lump.
上述した固結防止の対象とされた無機化学品である食塩と炭酸水素ナトリウムは、常態ではいずれも無水物であり、本発明者らの実験によれば、温度２５℃、相対湿度７５％の環境条件下で２４時間放置したとき、吸湿による重量増加はそれぞれ１．７％と０．１％未満程度である。これに対して、硝酸マグネシウム６水塩は同じ環境条件下で２４時間放置したとき、吸湿による重量増加は７．４％にも達し、食塩や炭酸水素ナトリウムに比べて、吸湿性が著しく高い。 Salt and sodium hydrogen carbonate, which are inorganic chemicals that are the targets of anti-caking, described above are both anhydrous in the normal state. According to the experiments by the present inventors, the temperature is 25 ° C. and the relative humidity is 75%. When left for 24 hours under environmental conditions, the weight increase due to moisture absorption is about 1.7% and less than 0.1%, respectively. In contrast, when magnesium nitrate hexahydrate is allowed to stand for 24 hours under the same environmental conditions, the weight increase due to moisture absorption reaches 7.4%, which is significantly higher in hygroscopicity than sodium chloride or sodium bicarbonate.
しかし、結晶水を有し、吸湿性の高い硝酸マグネシウム６水塩については、従来、有効な固結防止の方法は知られていない。
本発明は、硝酸マグネシウム６水塩の固結防止における上述した問題を解決するためになされたものであって、工業用原料としてのマグネシウムの品位を低下させることなく、硝酸マグネシウム６水塩の固結を防止することができる、工業上、有用な方法と、更には、そのように固結を防止した硝酸マグネシウム６水塩組成物を提供することを目的とする。 The present invention has been made in order to solve the above-described problems in preventing the consolidation of magnesium nitrate hexahydrate, and without reducing the quality of magnesium as an industrial raw material, the solidification of magnesium nitrate hexahydrate. An object of the present invention is to provide an industrially useful method capable of preventing flocculation, and further to provide a magnesium nitrate hexahydrate composition which prevents caking.
本発明によれば、硝酸マグネシウム６水塩に固結防止剤としてマグネシウム炭酸塩３〜５０重量％を添加することを特徴とするしてなる硝酸マグネシウム６水塩の固結防止方法が提供される。更に、本発明によれば、硝酸マグネシウム６水塩に固結防止剤としてマグネシウム炭酸塩３〜５０重量％を添加してなる固結防止マグネシウム６水塩組成物が提供される。 According to the present invention, there is provided a method for preventing caking of magnesium nitrate hexahydrate, which comprises adding 3 to 50% by weight of magnesium carbonate as a caking inhibitor to magnesium nitrate hexahydrate. . Furthermore, according to the present invention, there is provided an anti-caking magnesium hexahydrate composition obtained by adding 3 to 50% by weight of magnesium carbonate as an anti-caking agent to magnesium nitrate hexahydrate.
本発明によれば、硝酸マグネシウム６水塩に固結防止剤としてマグネシウム炭酸塩３〜５０重量％を添加することによって、吸湿性の高い硝酸マグネシウム６水塩の固結を有効に防止することができる。しかも、本発明のこのような方法によれば、工業用原料としてのマグネシウムの品位を低下させることがない。従って、本発明のこのような方法によって得られる硝酸マグネシウム６水塩組成物は、例えば、触媒、セラミックス、ガラス等の製造原料として、また、これらに関連する用途に有用である。 According to the present invention, by adding 3 to 50% by weight of magnesium carbonate as an anti-caking agent to magnesium nitrate hexahydrate, it is possible to effectively prevent caking of highly hygroscopic magnesium nitrate hexahydrate. it can. Moreover, according to such a method of the present invention, the quality of magnesium as an industrial raw material is not lowered. Therefore, the magnesium nitrate hexahydrate composition obtained by such a method of the present invention is useful, for example, as a raw material for production of catalysts, ceramics, glass, and the like and related applications.
本発明による硝酸マグネシウム６水塩の固結防止方法は、硝酸マグネシウム６水塩に固結防止剤としてマグネシウム炭酸塩３〜５０重量％、好ましくは、５〜２０重量％を添加するものである。好ましくは、、吸湿性の高い硝酸マグネシウム６水塩の固結を有効に防止することができる。硝酸マグネシウム６水塩に対する添加割合が３重量％よりも少ないときは、固結防止の効果が殆どなく、他方、５０重量％より多くても、それに見合うような固結防止の効果の向上はみられない。 In the method for preventing caking of magnesium nitrate hexahydrate according to the present invention, magnesium carbonate 3 to 50% by weight, preferably 5 to 20% by weight, is added to magnesium nitrate hexahydrate as a caking inhibitor. Preferably, caking of magnesium nitrate hexahydrate with high hygroscopicity can be effectively prevented. When the addition ratio to the magnesium nitrate hexahydrate is less than 3% by weight, there is almost no anti-caking effect. On the other hand, when it is more than 50% by weight, the anti-caking effect can be improved correspondingly. I can't.
本発明において、上記マグネシウム炭酸塩は、炭酸マグネシウム、塩基性炭酸マグネシウム又はこれらの混合物である。その粒径や形状に特に制限はないが、好ましくは、比表面積２０ｍ2／ｇ以上、平均粒径１．０〜１０μｍの微粉末が好ましく用いられる。 In the present invention, the magnesium carbonate is magnesium carbonate, basic magnesium carbonate, or a mixture thereof. The particle size and shape are not particularly limited, but preferably a fine powder having a specific surface area of 20 m 2 / g or more and an average particle size of 1.0 to 10 μm is preferably used.
炭酸マグネシウムは、通常、一般式（Ｉ）
ＭｇＣＯ3・ｎＨ2Ｏ
（式中、ｎは０〜３の範囲の数である。）
で表される。
Magnesium carbonate is usually of the general formula (I)
MgCO 3 · nH 2 O
(In the formula, n is a number in the range of 0 to 3.)
It is represented by
また、塩基性炭酸マグネシウムは、通常、一般式（II）
ｘＭｇＣＯ3・Ｍｇ( ＯＨ)2・ｙＨ2Ｏ
（式中、ｘは３〜５の範囲の数であり、ｙは３〜７の範囲の数である。）
で表される。
Basic magnesium carbonate is usually represented by the general formula (II)
xMgCO 3 · Mg (OH) 2 · yH 2 O
(In the formula, x is a number in the range of 3 to 5, and y is a number in the range of 3 to 7.)
It is represented by
本発明に従って、硝酸マグネシウム６水塩の固結防止を図るには、硝酸マグネシウム６水塩に上記マグネシウム炭酸塩を添加、混合すればよく、このようにして、本発明による硝酸マグネシウム６水塩に固結防止剤としてマグネシウム炭酸塩３〜５０重量％を添加してなる固結防止マグネシウム６水塩組成物を得ることができる。上記混合のための手段、方法は特に限定されるものではなく、従来より知られている適宜の手段、方法を用いることができる。 In order to prevent caking of the magnesium nitrate hexahydrate according to the present invention, the magnesium carbonate may be added to and mixed with the magnesium nitrate hexahydrate, and thus the magnesium nitrate hexahydrate according to the present invention is added. An anti-caking magnesium hexahydrate composition obtained by adding 3 to 50% by weight of magnesium carbonate as an anti-caking agent can be obtained. The means and method for mixing are not particularly limited, and any conventionally known means and method can be used.
このようにして、硝酸マグネシウム６水塩にマグネシウム炭酸塩を添加、混合してなる組成物は、一般的な包装材料、例えば、ポリエチレン樹脂からなる低透湿性の包装袋に密封すれば、その固結を長期間にわたってよく防止することができる。 In this way, a composition obtained by adding and mixing magnesium carbonate to magnesium nitrate hexahydrate can be solidified by sealing in a general packaging material, for example, a low moisture-permeable packaging bag made of polyethylene resin. It is possible to prevent ligation well over a long period of time.
本発明による硝酸マグネシウム６水塩組成物は、マグネシウム炭酸塩を含むので、酸根としては、硝酸根と炭酸根とを含むが、しかし、カチオン成分としては、マグネシウムのみを含むので、高品位のマグネシウム原料として用いることができる。また、本発明による硝酸マグネシウム６水塩組成物を水に加えて溶解させたとき、固結防止剤として添加されているマグネシウム炭酸塩は水に溶解せず、水不溶分として分離するが、これに硝酸を添加することによって、容易に溶解するので、硝酸マグネシウムの水溶液を容易に得ることができる。 Since the magnesium nitrate hexahydrate composition according to the present invention contains magnesium carbonate, the acid radical contains nitrate radical and carbonate radical, but the cation component contains only magnesium, so high grade magnesium. It can be used as a raw material. Further, when the magnesium nitrate hexahydrate composition according to the present invention is dissolved in water, the magnesium carbonate added as an anti-caking agent does not dissolve in water but is separated as a water-insoluble component. Since it dissolves easily by adding nitric acid to it, an aqueous solution of magnesium nitrate can be easily obtained.
以下に実施例を挙げて本発明を説明するが、本発明はこの実施例に何ら限定されるものではない。 Hereinafter, the present invention will be described with reference to examples. However, the present invention is not limited to the examples.
実施例１
硝酸マグネシウム６水塩４０００ｇに塩基性炭酸マグネシウム（ＢＥＴ法による比表面積３２．５ｍ2／ｇ）２０．１ｇ（０．５重量％）を添加し、リボンブレンダーで混合した後、１０００ｇずつをポリエチレン樹脂袋（４０℃での透湿度６ｇ／ｃｍ2・日）に詰めて、ヒートシールした。得られた４つの包装物に５０ｇｆ／ｃｍ2 の荷重を加えながら、常温常湿下で放置し、２週間、４週間、８週間、１２週間後にそれぞれ１袋ずつ開封して、硝酸マグネシウム６水塩の固結の程度を調べた。結果を表１に示す。
Example 1
After adding 20.1 g (0.5% by weight) of basic magnesium carbonate (specific surface area 32.5 m 2 / g by BET method) to 4000 g of magnesium nitrate hexahydrate and mixing with a ribbon blender, 1000 g each of polyethylene resin A bag (moisture permeability of 6 g / cm 2 · day at 40 ° C.) was packed and heat sealed. While applying a load of 50 gf / cm 2 to the four packages thus obtained, they were allowed to stand at room temperature and humidity, and opened one bag after 2 weeks, 4 weeks, 8 weeks, and 12 weeks. The degree of salt consolidation was examined. The results are shown in Table 1.
ポリエチレン樹脂袋の開封したときの硝酸マグネシウム６水塩の固結の程度は以下のようにして調べた。即ち、硝酸マグネシウム６水塩はさらさらしており、塊の生成が認められなかったときを優（◎）、硝酸マグネシウム６水塩の塊の生成が僅かに認められるが、しかし、その塊を手で掴もうとすると容易に壊れるときを良（○）、硝酸マグネシウム６水塩の塊の生成が認められ、その塊は手で掴むことができるが、容易に崩すことができるときを可（△）、硝酸マグネシウム６水塩の塊の数が多く、しかも、その塊が硬いときを不可（×）とした。 The degree of consolidation of magnesium nitrate hexahydrate when the polyethylene resin bag was opened was examined as follows. That is, magnesium nitrate hexahydrate is free flowing, and when the formation of lumps is not observed (優), the formation of magnesium nitrate hexahydrate is slightly observed. When it tries to grab it, it is good when it breaks easily (○), the formation of magnesium nitrate hexahydrate lump is recognized, the lump can be grasped by hand, but it can be easily broken (△ ), When the mass of magnesium nitrate hexahydrate was large and the mass was hard, it was determined as impossible (x).
実施例２〜８
表１に示すように、実施例１において、硝酸マグネシウム６水塩に対する塩基性炭酸マグネシウムの添加割合を変えた以外は、実施例１と同様にして、硝酸マグネシウム６水塩の固結の程度を調べた。結果を表１に示す。
Examples 2-8
As shown in Table 1, in Example 1, the degree of consolidation of magnesium nitrate hexahydrate was determined in the same manner as in Example 1 except that the addition ratio of basic magnesium carbonate to magnesium nitrate hexahydrate was changed. Examined. The results are shown in Table 1.
参考例１
実施例１において、硝酸マグネシウム６水塩に対する塩基性炭酸マグネシウムの添加量を７０重量％とした以外は、実施例１と同様にして、硝酸マグネシウム６水塩の固結の程度を調べた。結果を表１に示す。
Reference example 1
In Example 1, the degree of consolidation of magnesium nitrate hexahydrate was examined in the same manner as in Example 1 except that the amount of basic magnesium carbonate added to magnesium nitrate hexahydrate was 70% by weight. The results are shown in Table 1.
実施例９〜１２
表１に示すように、実施例１において、硝酸マグネシウム６水塩に対する塩基性炭酸マグネシウムの添加割合を３重量％とし、これを種々の透湿度を有するポリエチレン樹脂袋に詰めた以外は、実施例１と同様にして、硝酸マグネシウム６水塩の固結の程度を調べた。結果を表１に示す。
Examples 9-12
As shown in Table 1, in Example 1, except that the addition ratio of basic magnesium carbonate to magnesium nitrate hexahydrate was 3% by weight, and this was packed in polyethylene resin bags having various moisture permeability. In the same manner as in Example 1, the degree of consolidation of magnesium nitrate hexahydrate was examined. The results are shown in Table 1.
実施例１３〜１６
表１に示すように、実施例１において、固結防止剤として、比表面積（ＢＥＴ法による。以下、同じ。）２５．３ｍ2／ｇの塩基性炭酸マグネシウムを硝酸マグネシウム６水塩に対する添加割合を変えて用いた以外は、実施例１と同様にして、硝酸マグネシウム６水塩の固結の程度を調べた。結果を表１に示す。
Examples 13-16
As shown in Table 1, in Example 1, the addition ratio of 25.3 m 2 / g of basic magnesium carbonate with respect to magnesium nitrate hexahydrate as the anti-caking agent is specific surface area (according to BET method, the same applies hereinafter). The degree of consolidation of the magnesium nitrate hexahydrate was examined in the same manner as in Example 1 except that was used. The results are shown in Table 1.
実施例１７〜２０
表２に示すように、実施例１において、固結防止剤として、塩基性炭酸マグネシウムと炭酸マグネシウムの重量比１／１の混合物（比表面積２３．８ｍ2／ｇ）を硝酸マグネシウム６水塩に対する添加割合を変えて用いた以外は、実施例１と同様にして、硝酸マグネシウム６水塩の固結の程度を調べた。結果を表２に示す。
Examples 17-20
As shown in Table 2, in Example 1, as a caking inhibitor, a mixture (basic surface area of 23.8 m 2 / g) of basic magnesium carbonate and magnesium carbonate in a weight ratio of 1/1 was used with respect to magnesium nitrate hexahydrate. Except for changing the addition ratio, the degree of consolidation of magnesium nitrate hexahydrate was examined in the same manner as in Example 1. The results are shown in Table 2.
実施例２１〜２５
表２に示すように、実施例１において、固結防止剤として、比表面積２２．３ｍ2／ｇの炭酸マグネシウムを硝酸マグネシウム６水塩に対する添加割合を変えて用いた以外は、実施例１と同様にして、硝酸マグネシウム６水塩の固結の程度を調べた。結果を表２に示す。
Examples 21-25
As shown in Table 2, in Example 1, as the anti-caking agent, magnesium carbonate having a specific surface area of 22.3 m 2 / g was used except that the addition ratio with respect to magnesium nitrate hexahydrate was changed. Similarly, the degree of consolidation of magnesium nitrate hexahydrate was examined. The results are shown in Table 2.
実施例２６〜２９
表２に示すように、実施例１において、固結防止剤として、比表面積１６．４ｍ2／ｇの炭酸マグネシウムを硝酸マグネシウム６水塩に対する添加割合を変えて用いた以外は、実施例１と同様にして、硝酸マグネシウム６水塩の固結の程度を調べた。結果を表２に示す。
Examples 26-29
As shown in Table 2, in Example 1, as the anti-caking agent, magnesium carbonate having a specific surface area of 16.4 m 2 / g was used except that the addition ratio with respect to magnesium nitrate hexahydrate was changed. Similarly, the degree of consolidation of magnesium nitrate hexahydrate was examined. The results are shown in Table 2.
比較例１〜５
硝酸マグネシウム６水塩１０００ｇずつを種々の透湿度を有するポリエチレン樹脂袋に詰めてヒートシールし、５０ｇｆ／ｃｍ2 の荷重を加えながら、常温常湿下で放置し、２週間、４週間、８週間、１２週間後にそれぞれ１袋ずつ開封して、実施例１と同様にして、硝酸マグネシウム６水塩の固結の程度を調べた。結果を表３に示す。
Comparative Examples 1-5
Each 1000 g of magnesium nitrate hexahydrate is packed in a polyethylene resin bag with various moisture permeability, heat sealed, and left under normal temperature and humidity while applying a load of 50 gf / cm 2 , 2 weeks, 4 weeks, 8 weeks After 12 weeks, one bag was opened, and the degree of consolidation of magnesium nitrate hexahydrate was examined in the same manner as in Example 1. The results are shown in Table 3.
比較例６〜１１
硝酸マグネシウム６水塩４０００ｇに微粒子ケイ酸（日本アエロジル（株）製２００、比表面積２００ｍ2／ｇ）を硝酸マグネシウム６水塩に対して種々の割合で添加、混合し、１０００ｇずつをポリエチレン樹脂袋（４０℃での透湿度６ｇ／ｃｍ2・日）に詰めて、ヒートシールした。得られた４つの包装物に５０ｇｆ／ｃｍ2 の荷重を加えながら、常温常湿下で放置し、２週間、４週間、８週間、１２週間後にそれぞれ１袋ずつ開封して、実施例１と同様にして、硝酸マグネシウム６水塩の固結の程度を調べた。結果を表３に示す。
Comparative Examples 6-11
Particulate silicic acid (200 made by Nippon Aerosil Co., Ltd., specific surface area 200 m 2 / g) was added to 4000 g of magnesium nitrate hexahydrate and mixed in various proportions with respect to magnesium nitrate hexahydrate, and 1000 g each was added to a polyethylene resin bag. It was packed into (moisture permeability of 6 g / cm 2 · day at 40 ° C.) and heat sealed. While applying a load of 50 gf / cm 2 to the four packages thus obtained, they were allowed to stand at room temperature and humidity and opened one bag at a time after 2 weeks, 4 weeks, 8 weeks, and 12 weeks. Similarly, the degree of consolidation of magnesium nitrate hexahydrate was examined. The results are shown in Table 3.
Claims (5)
A method for obtaining a magnesium nitrate aqueous solution by adding the magnesium nitrate hexahydrate composition according to claim 3 or 4 to water and further adding nitric acid.
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| JP2014009122A (en) * | 2012-06-29 | 2014-01-20 | Nippon Electric Glass Co Ltd | Glass material and process of producing glass |
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| JPH0558622A (en) * | 1991-08-30 | 1993-03-09 | Asahi Glass Co Ltd | Consolidation inhibition method of sodium hydrogen carbonate |
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| JPH0624738A (en) * | 1991-06-12 | 1994-02-01 | Japan Tobacco Inc | Method for preventing common salt from caking |
| JP2000233922A (en) * | 1999-02-15 | 2000-08-29 | Solt Industry Center Of Japan | Caking preventing method of hygroscopic inorganic powder |
| JP2001220133A (en) * | 2000-02-07 | 2001-08-14 | Mitsubishi Chemicals Corp | Anticaking agent for ammonium nitrate granular body |
| JP2002362921A (en) * | 2001-06-06 | 2002-12-18 | Sakai Chem Ind Co Ltd | Method for preventing caking of strontium compound or barium compound and composition therefor |
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|---|---|---|---|---|
| JPH0624738A (en) * | 1991-06-12 | 1994-02-01 | Japan Tobacco Inc | Method for preventing common salt from caking |
| JPH0558622A (en) * | 1991-08-30 | 1993-03-09 | Asahi Glass Co Ltd | Consolidation inhibition method of sodium hydrogen carbonate |
| JPH05229815A (en) * | 1992-02-20 | 1993-09-07 | Japan Tobacco Inc | Method for preventing agglomeration of salt |
| JP2000233922A (en) * | 1999-02-15 | 2000-08-29 | Solt Industry Center Of Japan | Caking preventing method of hygroscopic inorganic powder |
| JP2001220133A (en) * | 2000-02-07 | 2001-08-14 | Mitsubishi Chemicals Corp | Anticaking agent for ammonium nitrate granular body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2014009122A (en) * | 2012-06-29 | 2014-01-20 | Nippon Electric Glass Co Ltd | Glass material and process of producing glass |
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