JPS5998728A - Magnesium oxide-magnesium hydroxide slurry - Google Patents
Magnesium oxide-magnesium hydroxide slurryInfo
- Publication number
- JPS5998728A JPS5998728A JP57208491A JP20849182A JPS5998728A JP S5998728 A JPS5998728 A JP S5998728A JP 57208491 A JP57208491 A JP 57208491A JP 20849182 A JP20849182 A JP 20849182A JP S5998728 A JPS5998728 A JP S5998728A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- magnesium
- magnesium hydroxide
- magnesium oxide
- oxide
- 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.)
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- Colloid Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は高濃度のマグネシウム系スラリーに関する。[Detailed description of the invention] The present invention relates to highly concentrated magnesium-based slurries.
水酸化マグネシウムはアルカリ性物質として、排煙の脱
硫剤や廃酸の中和剤として広く用いられている。水酸化
マグネシウムは弱アルカリ性の物質であり、同じ用途に
用いられる苛性ソーダに比較して危険性はほとんどない
。さらに、マグネシウムは２価のイオンとして作用する
ため、苛性ソーダに比較して％ ７割の重量で同じ量の
酸を中和することができるなどの特徴を有する。Magnesium hydroxide is an alkaline substance that is widely used as a desulfurizing agent for flue gas and as a neutralizing agent for waste acids. Magnesium hydroxide is a weakly alkaline substance and is much less dangerous than caustic soda, which is used for the same purpose. Furthermore, since magnesium acts as a divalent ion, it has the advantage of being able to neutralize the same amount of acid with 70% less weight than caustic soda.
水酸化マグネシウムは固体であり、水に微量しか溶けな
いため、苛性ソーダのように液体として使用することが
できない。水酸化マグネシウムのこの欠点を補うために
、水酸化マグネシウムをスラリーとして用いる方法が開
発されている。このスラリー化を、排煙脱硫や廃酸の中
和を行う個々の現場で実施すると、人手を要すること、
粉体が飛散して環境の悪化を招くなどのため、普通には
、製造工場でスラリー化したものを個々の現場に輸送す
る方法が行なわれている。ところが、現在一般に使用さ
れているスラリーは水酸化マグネシウムの含有率が３０
％前後であり、水酸化マグネシウムの輸送効率としては
かなり低いものとなっている。水酸化マグネシウムの輸
送効率が低いことはスラリーの輸送できる範囲が限定さ
れ、また輸送範囲内であってもコストの高い水酸化マグ
ネシウムを使用することになる。Magnesium hydroxide is a solid and dissolves only in trace amounts in water, so it cannot be used as a liquid like caustic soda. In order to compensate for this drawback of magnesium hydroxide, methods have been developed in which magnesium hydroxide is used as a slurry. If this slurrying is carried out at individual sites where flue gas desulfurization or waste acid neutralization is performed, it will require manpower;
Because powder scatters and causes environmental degradation, the usual method is to make slurry at the manufacturing plant and transport it to individual sites. However, the currently commonly used slurry has a magnesium hydroxide content of 30%.
%, which is a fairly low transport efficiency for magnesium hydroxide. The low transportation efficiency of magnesium hydroxide limits the range in which the slurry can be transported, and even within the transportation range, high-cost magnesium hydroxide is used.
スラリー中の水酸化マグネシウムの含鳴率を上げ、水酸
化マグネシウムの輸送コストを引き下げる試みはいくつ
か行なわれている７、そのひとつに、脱水した水酸化マ
グネシウムのケークを水酸化マグネシウムスラリーに混
合し、スラリー中の水酸化マグネシウムの濃度を高める
方法がある。この方法を現在我国で広く行なわれている
。海水マグネシアの製造工程で得られる水酸化マグネシ
ウムに適用すると、水酸化マグネシウムの含有率が３５
チ以」二では著るしく粘度が上り、含有率４０％以上で
は流体として扱えない程度にまで粘度が上昇する。した
がって、水酸化マグネシウムのスラリーをタンクローリ
−など通常の液体！ｌ、ｉｆ送の手段で輸送できるのは
水酸化マグネシウムの濃度で３７〜３８チが限度とみら
れている。Several attempts have been made to increase the inclusion rate of magnesium hydroxide in slurry and reduce the transportation cost of magnesium hydroxide7. One of these is to mix dehydrated magnesium hydroxide cake into magnesium hydroxide slurry. , there is a method to increase the concentration of magnesium hydroxide in the slurry. This method is currently widely practiced in our country. When applied to magnesium hydroxide obtained in the manufacturing process of seawater magnesia, the content of magnesium hydroxide is 35%.
If the content exceeds 40%, the viscosity increases to such an extent that it cannot be treated as a fluid. Therefore, the slurry of magnesium hydroxide can be transported into tank trucks and other ordinary liquids! It is believed that the maximum concentration of magnesium hydroxide that can be transported by IF transport is 37 to 38 cm.
本発明は、水酸化マグネシウムと微粉砕した酸化マグネ
シウムを配合することにより、水酸化マグネシウムに換
算して極めて輸送効率の高いスラリーを見出したもので
ある。The present invention has discovered a slurry with extremely high transport efficiency in terms of magnesium hydroxide by blending magnesium hydroxide and finely ground magnesium oxide.
本発明は比表−ＩＴｉ＋積１５ ｎｌ″／ｙ以下の酸化
マグネシウムの含有率が５〜６０重量％で、水酸化マグ
ネシウムの含有率が５〜４０貫量係で、残部が水であり
、スラリーを構成する粒子の９５チ以上が４４μｍ以下
でかつ、塩酸未溶解残液が５チ以下である酸化マグネシ
ウム−水酸化マグネシウムスラリーである。The present invention provides a slurry in which the content of magnesium oxide is 5 to 60% by weight, the content of magnesium hydroxide is 5 to 40% by weight, the balance is water, and the ratio is -ITi+product 15 nl''/y or less. This is a magnesium oxide-magnesium hydroxide slurry in which 95 or more of the particles constituting the slurry are 44 μm or less, and the amount of undissolved residual liquid in hydrochloric acid is 5 or less.
酸化マグネシウムは水和性の強い物質であるため、水に
懸濁させてスラリー化すると、媒体である水と反応し、
スラリー状態が保てないのではないかとの懸念があった
。しかしながら、実際にスラリー化を行ってみると、冬
期で一週間以上、夏期でも一昼夜程度の間スラリー状態
を保つことは、さして困難でないことが判明した。本発
明の酸化マグネシウム−水酸化マグネシウムスラリーは
、水酸化マグネシウムスラリーと同様に使用されるので
、輸送期間中高濃度のスラリー状態が保てればそのひと
つの目的は達せられる。すなわち、輸送の終ったスラリ
ーは従来の水酸化マグネシウムスラリーと同程度の濃度
まで稀釈すれば、以後の取扱は従来使用されている水酸
化マグネシウムスラリーと同様に行うことができる。Magnesium oxide is a highly hydrating substance, so when it is suspended in water and made into a slurry, it reacts with the water medium,
There were concerns that the slurry state could not be maintained. However, when actually slurrying was carried out, it was found that it was not very difficult to maintain the slurry state for more than a week in the winter and for about a day and night in the summer. Since the magnesium oxide-magnesium hydroxide slurry of the present invention is used in the same manner as magnesium hydroxide slurry, one of its purposes can be achieved if a highly concentrated slurry state can be maintained during transportation. That is, if the slurry that has been transported is diluted to the same concentration as a conventional magnesium hydroxide slurry, it can be subsequently handled in the same manner as a conventionally used magnesium hydroxide slurry.
本発明のスラリーに用いる酸化マグネシウムの比表面積
は、大きい程活性が高く、排煙脱硫等に用いたときの反
応性も期待されるが、反面、水との故旧性も高捷る。酸
化マグネシウムが水和反応を起すと、スラリー粘度が高
まり、はなはだしいときには固化の現象を示す。酸化マ
グネシウムの比表ｊＩＩＴ ｊＢが１．５ ｍ７ｆ以下
なら、比較的安心して使用することができ、８ｍ”／ｆ
以下なら、さらに安心して用いることができる。酸化
マグネシウムの比表！ｔ！積が、小さくなると、排煙脱
硫等に用いた場合の反応性の低下が予想されたが、比表
面積１ｍ２／１ 以下の鹸化マグネシウムでも、水酸化
マグネシウムとの混合を兼ねた湿式粉砕を行えば十分に
実用化できることが認められた。The larger the specific surface area of the magnesium oxide used in the slurry of the present invention, the higher the activity, and the reactivity is expected when used for flue gas desulfurization, etc. However, on the other hand, it is highly susceptible to degradation with water. When magnesium oxide undergoes a hydration reaction, the viscosity of the slurry increases, and in severe cases, solidification occurs. If the ratio table jIIT jB of magnesium oxide is 1.5 m7f or less, it can be used with relative peace of mind, and 8 m"/f
The following can be used more safely. Magnesium oxide ratio table! T! It was predicted that as the surface area becomes smaller, the reactivity will decrease when used for flue gas desulfurization, etc. However, even with saponified magnesium having a specific surface area of 1 m2/1 or less, wet pulverization that also serves as a mixture with magnesium hydroxide can reduce the reactivity. It was confirmed that it can be fully put into practical use.
鹸化マグネシウムの含有率は６０チを越えると、スラリ
ーの粘度が上昇するだけでなく、ある程度水和が進行す
ると、粘度が急上昇し、固結する現象が顕著になる。才
だ、酸化マグネシウムの含有率が５係より少ない場合に
は、スラリー濃度が十分に高１らず、発明の効果が小さ
くなる。以上のことを考慮して、配化マグネシウムの含
有率はｌＯ〜４０饅であることがとくに望ましい。When the content of saponified magnesium exceeds 60%, not only does the viscosity of the slurry increase, but when hydration progresses to a certain extent, the viscosity increases rapidly and the phenomenon of caking becomes noticeable. However, if the content of magnesium oxide is less than 5%, the slurry concentration will not be high enough and the effect of the invention will be reduced. In consideration of the above, it is particularly desirable that the content of magnesium chloride is 10 to 40 yen.
水酸化マグネシウムの含有率がスラリー粘度に与える影
響は酸化マグネシウムの含有率に比較してはるかに大き
い。例えば、酸化マグネシウムは含有率６０チでも、ス
ラリーの形態を保っているが、水酸化マグネシウムでは
含有率５０％でほぼ完全にケークの状態になる。スラリ
ーの輸送効率を高める上からは、水酸化マグネシウムの
含有はむしろ好ましくないようにもみられる。しかし、
水酸化マグネシウムには、スラリーの粘度を粒子の沈降
を防ぐ範囲内に保つ作用、酸化マグネシウムの水和によ
る粘度上昇を緩和する働きが認められた。The influence of the content of magnesium hydroxide on the slurry viscosity is much greater than that of the content of magnesium oxide. For example, magnesium oxide maintains a slurry form even at a content of 60%, but magnesium hydroxide becomes almost completely cake-like at a content of 50%. From the viewpoint of increasing the transport efficiency of the slurry, it seems that the inclusion of magnesium hydroxide is rather undesirable. but,
Magnesium hydroxide was found to have the ability to maintain the viscosity of the slurry within a range that prevents particles from settling, and to moderate the increase in viscosity due to hydration of magnesium oxide.
スラリー中の粒子の大ぎさは小さい程反応性が高く、使
用するのに都合のよいことが多い。しかし、粒子をいた
ずらに小さくすることは粉砕等の費用がかさむことにな
り刊策ではなく、必要最小限の条件を満すようにすべき
である。本発明の場合、粒子の大きさは、使用時の条件
から９５重量％以上の粒子が４４μｍの篩を追加するこ
とが必要であり、はぼ全部の粒子が４４μｍの篩を通過
することがとくに望ましい。The smaller the particle size in the slurry, the higher the reactivity, and is often convenient to use. However, unnecessarily reducing the size of particles increases the cost of pulverization, etc., so it is not a published policy, and the minimum necessary conditions should be met. In the case of the present invention, it is necessary to add a 44 μm sieve to ensure that 95% by weight or more of the particles pass through a 44 μm sieve due to the conditions at the time of use. desirable.
塩酸未溶解残渣は反応に役立ないけがシでなく、使用後
は残渣としての処理が必要となるので、なるべく少ない
ことが望ましい。ただし、排煙脱流にしろ排酸の中和に
しろ、最終的な排水処理の工程にはｐ過の工程があるの
が普通であり、残渣は未燃焼カーボン、排水中の懸濁物
とともに除去される。残渣が５係までは、未燃焼カーボ
ンなどに比較してとくに多いわけではなく許容される範
囲とみられるが２％以下にすることがより望ましい。The undissolved residue in hydrochloric acid is not a nuisance that is not useful for the reaction, and must be treated as a residue after use, so it is desirable that the amount is as small as possible. However, whether it is exhaust gas deflow or exhaust acid neutralization, the final wastewater treatment process usually includes a p-filtration process, and the residue is mixed with unburned carbon and suspended matter in the wastewater. removed. Although the amount of residue up to 5% is not particularly large compared to unburned carbon and is considered to be within an acceptable range, it is more desirable to keep it below 2%.
本発明のスラリーは、海水マグネシアの製造工程で得ら
れる水酸化マグネシウムスラリーに天然のマグネサイト
を軽焼して得られる酸化マグネシウムを配合し、ボール
ミルで湿式粉砕混合する方法でも祷られる。海水マグネ
シアの製造工程で得られる水酸化マグネシウムはＩ札純
度で品質も安定しているので、その添加割合を加減する
ことにより、純度が低く、組成の一定しない天然の酸化
マグネシウムを用いても、一定品質のスラリーを得るこ
とができる。我国の資涼、エイ・ルギー事情を考えれば
この方法は大きな意義をもつものとみられる。The slurry of the present invention can also be prepared by blending magnesium oxide obtained by lightly calcining natural magnesite with a magnesium hydroxide slurry obtained in the process of producing seawater magnesia, and wet-pulverizing and mixing the slurry with a ball mill. Magnesium hydroxide obtained in the manufacturing process of seawater magnesia has I-tag purity and stable quality, so by adjusting the addition ratio, even if natural magnesium oxide with low purity and inconsistent composition is used, A slurry of constant quality can be obtained. Considering the current situation in Japan, this method seems to have great significance.
以下実施例により本発明を説明する。The present invention will be explained below with reference to Examples.
実施例１
比表面積１２ ｒｒ？／ｆの酸化マグネシウムと水酸化
マグネシウムを各々２ＯＮ量係になるように配合し、ホ
モジナイザーで分散させ均一なスラリーとした。このも
のの４４μｍ篩上は０．２％であり塩酸未溶解残渣は０
．５ ％であった。この原料の化学組成を下記に、また
配合後のスラリーの粘度は 。Example 1 Specific surface area 12 rr? /f magnesium oxide and magnesium hydroxide were mixed in an amount of 2ON each, and dispersed with a homogenizer to form a uniform slurry. The content of this product on a 44 μm sieve is 0.2%, and the undissolved residue in hydrochloric acid is 0.
．． It was 5%. The chemical composition of this raw material is shown below, and the viscosity of the slurry after blending is .
２．２ボイズ、−昼夜放置後の粘度は２．７ボイズでス
ラリー状態を保った。この配合したスラリーを塩化鉄を
主成分とする排水に１．２尚量加え、排水のｐＨの値の
変化を実測した結果を図−１に示す。2.2 voids - The viscosity after standing for day and night was 2.7 voids, maintaining a slurry state. Figure 1 shows the results of adding 1.2 molar equivalents of this blended slurry to wastewater containing iron chloride as a main component and measuring the change in pH value of the wastewater.
なお、比較のため前記水酸化マグネシウムのみからなる
スラリーについて排水のｐＨＯ値の変化を測定し、その
結果を図−１に示す。図−１に示す通シ酸化マグネシウ
ムと水酸化マグネシウムとよりなるスラリーは秀れた反
応性を持つことが分る１、ＭｇＯＣａＯＲ２Ｏ３５ｉｎ
２１ｙ−１ｏｓｓ酸化マグネシウム（４）９５．７ １
゜ＯＱ、１４ ０．２７ ２．６水酸化マグネシウｆ
ｉ ６６．８ ０．６８ ０．１０ ｏ、ｔ８３
２．１実施例２
比表面）Ｒ６ｎｉ’／ ｆの天然ものの酸化マグネシウ
ムと、海水マグネシア製造工程で得られる水酸化マグネ
シウムスラリーを配合し酸化マグネシウム１５重縫チ、
水酸化マグネシウム３２重量−のスラリーをつくり、こ
のものを湿式のボールミルで粉砕し、排煙脱硫用のスラ
リーとし／ζ。この排煙脱硫用のスラリーの粒度を測定
したところ、９８チが４４μｍ以下であり、塩酸未溶解
残渣を測定したところＸ、５ｅｉ６であった。このもの
の粘度は、７，３ボイズ液温２６℃で３昼夜放置後の粘
度は９．４ボイズでスラリー状を保った。その後排煙脱
硫用途に用いたが従来の水酸化マグネシウムスラリーと
同等の脱硫効率が得られた。For comparison, changes in the pH value of waste water were measured for the slurry made only of magnesium hydroxide, and the results are shown in Figure 1. It can be seen that the slurry made of magnesium oxide and magnesium hydroxide shown in Figure 1 has excellent reactivity.1, MgOCaOR2O35in
21y-1oss magnesium oxide (4) 95.7 1
°OQ, 14 0.27 2.6 Magnesium hydroxide f
i 66.8 0.68 0.10 o, t83
2.1 Example 2 Specific surface) Natural magnesium oxide with R6ni'/f and magnesium hydroxide slurry obtained in the seawater magnesia manufacturing process were blended to produce magnesium oxide with 15 layers of stitches.
A slurry of 32% by weight of magnesium hydroxide was prepared, and this slurry was ground in a wet ball mill to obtain a slurry for flue gas desulfurization. When the particle size of this slurry for flue gas desulfurization was measured, 98 pieces were found to be 44 μm or less, and when the undissolved residue in hydrochloric acid was measured, it was found to be X, 5ei6. The viscosity of this product was 7.3 boids. After being left for 3 days and nights at a liquid temperature of 26° C., the viscosity was 9.4 boids and remained slurry-like. It was then used for flue gas desulfurization, and the same desulfurization efficiency as conventional magnesium hydroxide slurry was obtained.
用いた酸化マグネシウムおよび水酸化マグネシウムの分
析値を以下に示す。The analytical values of the magnesium oxide and magnesium hydroxide used are shown below.
Ｍｈｏ ＣａＯＲ２０ａ ５ｉ０２ Ｉｙ、ｔ
ｏｓｓ酸化マグネシウム（％）９０．３ １．６５
０．５４ ３．２４ ３．９水酸化マグネシウム（％
）６６．８ ０．６８ ０．１０ ０．１７ ３２
．０実施例３
比表面積１．６ ｒｎ”／ｆの天然ものの酸化マグネシ
ウムと、海水マグネシア製造工程で得られる水酸化マグ
ネシウムスラリーを配合し、酸化マグネシウム４０Ｍ量
チ水酸化マグネシウム２０″ＸＩＣ＋ｉ４％のスラリー
をつくり、このものを湿式のボールミルで粉砕し、排煙
脱硫用のスラリーとした。この排煙脱硫用のスラリーの
粒度を測定したところ、９６チが４４μｍ以下であり、
塩酸未溶解残渣を測定したところ４．２％であった。こ
のスラリーの粘度は１．９ボイズであり１４時間で輸送
したのちの粘度は２．１ボイズであり、輸送先で同量の
水を加えて、排煙脱硫用途に用いたが従来の水酸化マグ
ネシウムスラリーと同等に使用することができた。Mho CaOR20a 5i02 Iy,t
oss magnesium oxide (%) 90.3 1.65
0.54 3.24 3.9 Magnesium hydroxide (%
)66.8 0.68 0.10 0.17 32
．． 0 Example 3 Natural magnesium oxide with a specific surface area of 1.6 rn"/f and magnesium hydroxide slurry obtained in the seawater magnesia production process were blended to form a slurry containing 40M magnesium oxide and 20"XIC+i4% of magnesium hydroxide. This material was ground in a wet ball mill to create a slurry for flue gas desulfurization. When the particle size of this slurry for flue gas desulfurization was measured, 96 pieces were 44 μm or less,
The amount of undissolved residue in hydrochloric acid was measured and found to be 4.2%. The viscosity of this slurry was 1.9 boids, and the viscosity after 14 hours of transportation was 2.1 boids.The same amount of water was added at the destination and used for flue gas desulfurization, but the viscosity was 2.1 boids after being transported for 14 hours. It could be used equally as magnesium slurry.
用いた酸化マグネシウムおよび水酸化マグネシウムの分
析値を以下に示す。The analytical values of the magnesium oxide and magnesium hydroxide used are shown below.
ＭｙＯＣａＯＲ２Ｏ３５４０ｚ ＩｙＪｂｓｓ酸化マ
グネシウム（％）９１．１ １．１１ １．７２ ４．
０８ １．ａＯ水水化化マグネシウム７６）６６、ｃ
＋ ０．４１ ０．１５ ｏ、ａｔ ３１．９MyOCaOR2O3540z IyJbss Magnesium oxide (%) 91.1 1.11 1.72 4.
08 1. aO magnesium hydrate 76) 66, c
+ 0.41 0.15 o, at 31.9
図−１は、５ＡＩＡｘ例１及び比較例における排水のｐ
Ｈ値の変化を示すグラフである。
特許出願人 新日本化学工業株式会社代理人
旭化成工業株式会社
図−１
１１間（分）Figure-1 shows the p of wastewater in 5AIAx Example 1 and Comparative Example.
It is a graph showing changes in H value. Patent applicant Shin Nihon Chemical Co., Ltd. Agent
Asahi Kasei Corporation Figure-1 11 minutes (minutes)
Claims (1)
有率が５〜６０重量％で、水酸化マグネシウムの含有率
が５〜４０重量％で、残部が水であシ、スラリーを構成
する粒子の９５−以上が４４μｍ以下でかつ、塩酸未溶
解残渣が５チ以下であることを特徴とする酸化マグネシ
ウム−水酸化マグネシウムスラリーThe content of magnesium oxide with a specific surface area of 15I11'/f or less is 5 to 60% by weight, the content of magnesium hydroxide is 5 to 40% by weight, and the balance is water. Magnesium oxide-magnesium hydroxide slurry, characterized in that the above diameter is 44 μm or less, and the amount of undissolved residue in hydrochloric acid is 5 μm or less
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57208491A JPS5998728A (en) | 1982-11-30 | 1982-11-30 | Magnesium oxide-magnesium hydroxide slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57208491A JPS5998728A (en) | 1982-11-30 | 1982-11-30 | Magnesium oxide-magnesium hydroxide slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5998728A true JPS5998728A (en) | 1984-06-07 |
| JPH0343210B2 JPH0343210B2 (en) | 1991-07-01 |
Family
ID=16557036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57208491A Granted JPS5998728A (en) | 1982-11-30 | 1982-11-30 | Magnesium oxide-magnesium hydroxide slurry |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5998728A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5134103A (en) * | 1991-02-04 | 1992-07-28 | Phillips Petroleum Company | Process for making magnesium oxide spheres |
| JP2016155128A (en) * | 2011-07-22 | 2016-09-01 | オムヤ インターナショナル アーゲー | PARTICULATE CaCO3 SLURRY INJECTION SYSTEM FOR RECALCIFICATION OF DESALTED WATER AND FRESH WATER |
| JP2017192871A (en) * | 2016-04-18 | 2017-10-26 | 宇部興産株式会社 | Acidic water neutralizer, and neutralizing method of acidic water |
-
1982
- 1982-11-30 JP JP57208491A patent/JPS5998728A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5134103A (en) * | 1991-02-04 | 1992-07-28 | Phillips Petroleum Company | Process for making magnesium oxide spheres |
| JP2016155128A (en) * | 2011-07-22 | 2016-09-01 | オムヤ インターナショナル アーゲー | PARTICULATE CaCO3 SLURRY INJECTION SYSTEM FOR RECALCIFICATION OF DESALTED WATER AND FRESH WATER |
| JP2017192871A (en) * | 2016-04-18 | 2017-10-26 | 宇部興産株式会社 | Acidic water neutralizer, and neutralizing method of acidic water |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0343210B2 (en) | 1991-07-01 |
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