KR101885843B1 - Hydromagnecite particles and a method of producing the same - Google Patents
Hydromagnecite particles and a method of producing the same Download PDFInfo
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- KR101885843B1 KR101885843B1 KR1020170111560A KR20170111560A KR101885843B1 KR 101885843 B1 KR101885843 B1 KR 101885843B1 KR 1020170111560 A KR1020170111560 A KR 1020170111560A KR 20170111560 A KR20170111560 A KR 20170111560A KR 101885843 B1 KR101885843 B1 KR 101885843B1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
Abstract
The present invention discloses synthetic hydro-magneite particles characterized by the following (1) to (3) and a process for producing the same.
(1) General formula
Mg 3.8 to 5.2 (OH) 1.8 to 2.15 (CO 3 ) 3.7 to 4.2 mH 2 O
(Wherein m is 0 to 5).
(2) Synthetic hydro-magnesite Monodisperse particles having a uniform shape and size, average particle diameter of 0.5 to 2.3 탆, and granular form in which ridged plate-like materials are laminated in various directions.
(3) The synthetic hydro-magne- site particles have a specific surface area of 20 to 55 m 2 / g as measured by the BET method.
Description
The present invention relates to a synthetic hydro-magnesite and a process for producing the same. More particularly, the present invention relates to a synthetic hydro-magneite particle having a high degree of monodispersity by controlling the pH and the reaction temperature of the reaction material, controlling the excess ions generated during synthesis by adding sodium hydroxide, .
Hydromagnesite is a hydrous carbonate mineral of magnesium. Its characteristic is low-temperature water-soluble minerals, and it is confirmed that it is mined in serpentinite and magnesium-rich metamorphic rocks and is mined in Austria, California, USA. It is said to be a symbiotic mineral, calcite, argonite, or weathering, and its chemical formula is Mg 5 (OH) 2 (CO 3 ) 4 nH 2 O (n is 5 or less), and the crystallographic characteristics are monoclinic eggs. Such hydro-magnesite is widely used as a flame retardant, a fire retardant additive for polymers, and an additive for spandex mixed with huntite, and its usage is also increasing.
Acquiring natural hydro-magneite from such minerals is limited in its supply amount and because of its different chemical structure depending on the mineral source to be mined, in industries requiring hydro-magneite having a certain chemical structure and quality, Can not be used. Accordingly, the industry has been expecting the advent of hydrotalcite having a certain quality for a long time.
Patent Document 1 discloses a method in which a crude raw material is stirred in a small amount of water to form a slurry, the slurry is heated to near boiling point, and the slurry is mixed with cold water while stirring to produce a mixture having a temperature of 75 이하 or less, A method of producing hydro-magnesite characterized by separating heavy particles and immersing the suspension in a sieve (about 80 mesh) "is disclosed. However, this method is economical because the reaction temperature is excessively high and the reaction time is long However, this method has not been used at present because there is a disadvantage that the obtained hydro-magnesite has to be pulverized and sieved to obtain a desired particle size, and an organic solvent must be used for purification.
Patent Document 2 discloses a method for producing hydro-magneite obtained by precipitating hydro-magneite by a double decomposition reaction of a water-soluble salt containing magnesium and an alkali metal carbonate, wherein the precipitate is represented by the general formula M n + 2 P n O 3n +1 In the presence of 0.1 g to 10 g of a reaction medium of a crystallization-improving agent selected from a phosphate having a general formula of M, an alkali metal, and n is an integer of 1 or more. have. The hydro-magnesite obtained by this method has good fluidity, is homogeneous, has a large apparent density, and has a large improvement. However, since the average particle size is as large as 80 to 170 탆, its use is limited and the reaction time is too long, have.
In Example 1 of Patent Document 3, "a suspension of magnesium hydroxide in high purity in an aqueous solution of potassium hydroxide is placed in a high-pressure reactor, and a CO 2 gas is introduced into the reactor at a high pressure to obtain a solution, And heated at a high current for 10 minutes to produce hydro-magne- site particles ". This method uses carbon dioxide gas as a carbonic acid supply source, so that the reaction time is long. Moreover, since magnesium hydroxide is mixed in the obtained hydro-magnesite, it does not matter what is used for tobacco paper. However, it's difficult.
Patent Document 4 discloses that at least one kind of magnesium oxide feedstock selected from the group consisting of magnesium oxide, magnesite, magnesium carbonate, magnesium hydroxide, brucite and mixtures thereof is slaked to convert magnesium oxide into magnesium hydroxide And a gaseous CO 2 and / or a carbonate-containing anion is reacted thereinto to at least partly convert to precipitated nesquchonite, and the obtained precipitated nesquezonite and precipitated calcium carbonate are subjected to heat aging treatment to obtain hydrogagnesite And a method for producing the same.
The use of carbon dioxide gas in the present invention is described as being advantageous for obtaining a high-purity hydro-magneite. However, although it has been described that the reaction time is too long and the use of carbonic acid gas as the carbonate ion feedstock is possible in the detailed description of the invention, it is not described in the examples, and the hydroxycarboxylate, It is difficult to use it in fields requiring high-purity hydro-magneite.
Patent Document 6 discloses "a process for producing magnesite and hydro-magnesite comprising a step of bringing brucite and a CO 2 source into contact at 15 to 40 ° C, particularly at 16 to 20 ° C, for 2 to 25 hours in the presence of a strong base in a medium having a pH of 13 or more"Lt; / RTI > It is believed that the present invention employs the fact that the reaction rate is increased when a strongly basic substance is used as a catalyst. However, the use of gaseous carbon dioxide is not preferable because of the restriction on the reactor and the reaction time, and the reaction time is inevitably longer than the liquid phase reaction.
Patent Document 7 relates to a method for producing a high purity hydrogagnesium and magnesium oxide from a brine containing magnesium chloride and calcium chloride, the claims of which include a) providing a feedstock of a magnesium chloride brine solution from the magnesium chloride source, Wherein the feedstock brine solution also comprises calcium chloride, b) mixing the sulfate into the feedstock brine solution to convert the calcium chloride to a calcium sulfate precipitate, c) removing the calcium sulfate precipitate from the brine solution, d) Is prepared at a temperature of about 20 to 120 DEG C while mixing the brine solution prepared in step c) with sodium carbonate to form a hydro-magne- sate precipitate. " This patented invention is a method for producing hydrogarmnite by reacting saline (seawater) with a sulfate ion feedstock compound to precipitate and remove calcium sulfate, and reacting the resulting magnesium chloride with sodium carbonate, It seems to be undesirable for a lot. Furthermore, since the final product is obtained in a bulk state, it is not advantageous because it contains a process which must be purified.
Patent Document 8 discloses a process for producing a magnesium chloride aqueous solution comprising the steps of: a) providing a feedstock of a magnesium chloride brine solution from the magnesium chloride source, wherein the feedstock brine solution also comprises calcium chloride; b) C) removing the calcium sulfate precipitate from the brine solution; d) salting the brine solution produced in step c) at a temperature ranging from about 20 < 0 > C to about 60 < Wherein the magnesium chloride is at least partially converted to magnesium hydroxide to form ammonium chloride, and e) carbonizing the magnesium hydroxide while maintaining the reaction temperature at about 20 to 120 캜 to form a hydro-magnesium precipitate. &Quot; discloses a method for producing hydro-magneite from . This method has advantages of using cheap brine. However, since a number of processes are used from obtaining brine to magnesium hydroxide, the manufacturing cost is increased due to such a process. In addition, during the manufacturing process, the magnesium chloride brine is diluted, It is difficult to say that the process of bringing the carbonic acid gas into contact with the agitated slurry takes a long reaction time and is economical.
Patent Document 9 discloses a composition for producing chlorine-containing polyurethane-urea elastic fibers containing 0.1 to 10 wt% of basic magnesium carbonate and elastic fibers thereof. A detailed description of the invention of this patent describes that basic magnesium carbonate (synthetic hydro-magneite) captures chlorine or chloride ions, and the synthesis of synthetic hydro-magneite "The magnesium carbonate hydrate is mixed with an aqueous solution of anhydrous sodium carbonate and then reacted at about 85 ° C for about 1 hour to react to obtain a basic carbonate compound which is pulverized to have a thickness of 0.01 to 2 μm and a diameter of 0.1 to 2 μm These particles aggregate to form an amorphous form having an average particle diameter of 0.5 to 15 mu m. &Quot; In the examples, the method of synthesizing hydro-magnesite is not specifically described, and in the detailed description of the invention Other than the above-mentioned contents, there is also no description on the specific synthesis method, the hydrodynamic magnesite used, and the like.
Patent Document 12 discloses a fiber obtained by adding a spinite-synthetic hydro-magneite to a spandex fiber to improve chlorine resistance. However, this document does not disclose the synthesis of synthetic hydro-magnesite or the production method thereof, which is described in using synthetic hydro-magnesite or hunting-synthetic hydro-magneite.
Patent Document 13 discloses a fiber in which chlorine resistance is improved by adding synthetic hydro-magneite to spandex fiber. However, this document only describes the surface treatment of synthetic hydro-magnesite, that is, coating with stearic acid or the like, and mixing and use thereof, and there is no description about the production of synthetic hydro-magneite particles at all.
Patent Document 14 discloses a spandex fiber containing hydrocarbons such as hydrotalcite, hunting and synthetic hydro-magnesite, zinc oxide and magnesium oxide, and the like. However, this document does not specifically describe the synthesis of synthetic hydro-magnesite and the like, and merely discloses that it is purchased and used from the outside.
As described above, the production of synthetic hydro-magne- site particles and their use have been disclosed, but it takes a long time to produce the hydro-magne- site particles, is uneconomical, or the hydro-magne- sate particles obtained are too irregular in shape, It is not always satisfactory to use it as.
Conventional synthetic hydro-magneite has a particle size of 500 to 15,000 nm (0.5 to 15 탆), which is excessively large. When the granulated powder is pulverized and granulated / pulverized, the particle shape is not uniform and uniform mixing with the raw resin such as spandex And the specific surface area was so small that the chlorine resistance of the resin was unsatisfactory.
In order to solve such problems, the present inventors have repeatedly modified the conditions of the above method by using sodium carbonate, potassium carbonate, or sodium bicarbonate and a magnesium ion compound in accordance with a conventional method of synthesizing hydrotalcite saw. However, the obtained hydro-magne- site particles were too large in size, their lip shapes were obtained in a plate-like shape, massive shape, and the average specific surface area thereof was only about 5 to 10 m2 / g. Of course, the required particle size can be obtained by pulverizing according to a conventional method, but it is not possible to have an increased specific surface area, and the irregular shape is obtained due to the grain size crushing of the obtained particles.
In particular, the hydro-magneite having a small specific surface area and irregular shape has an adverse effect on the physical properties of the final product obtained by mixing with other resins, so that the industry has a usable particle size without crushing, uniformity, The emergence of this large synthetic hydro-magnesite has been desired.
The present inventors have found that, in the production of hydro-magnesite using a carbonate solution of an alkali metal such as sodium carbonate or potassium carbonate and a magnesium ion solution, a predetermined hydro-magnesite which solves the above problems by setting a specific reaction temperature and pH, . The present inventors have completed the present invention on the basis of such realistic experiments.
The synthetic hydro-magneite according to the present invention has an average particle size in the range of 0.5 to 2.0 占 퐉 and a specific surface area of 20 to 55 m < 2 > / g, which does not require an additional milling step, The shape of the plate is gathered, and the flowability is good, the compatibility with the polymer resin and the solvent is excellent, and the chlorine resistance is excellent.
Further, according to the present invention, it is possible to produce synthetic hydro-magnesite uniformly and inexpensively.
1 shows a low-magnification and high-magnification electron micrograph (SEM) photograph of the synthetic hydro-magneite synthesized in Comparative Example 1. Fig.
Fig. 2 is an image pattern showing the X-ray diffraction intensity of the synthesized hydro-magneite synthesized in Comparative Example 1. Fig.
Fig. 3 is a spectrum showing particle size distribution of the synthetic hydro-magneite particles synthesized in Comparative Example 1. Fig.
4 is a low-magnification and high-magnification electron micrograph (SEM) photograph of the synthetic hydro-magneite synthesized in Comparative Example 2. Fig.
5 shows a low magnification and high magnification electron micrograph (SEM) photograph of the synthesized hydro-magneite synthesized in Example 1. Fig.
6 is an image pattern showing the X-ray diffraction intensity of the synthesized hydro-magneite synthesized in Example 1. Fig.
7 is a spectrum showing particle size distribution of the synthesized hydro-magmatic particles synthesized in Example 1. Fig.
Hereinafter, the present invention will be described in detail.
The synthetic hydro-magneite produced by the present invention has the following characteristics.
(1) General formula
Mg 3 .8 to 5.2 (OH) 1.8 to 2.15 (CO 3 ) 3.7 to 4.2 mH 2 O
(Wherein m is 0? N <5).
(2) The synthetic hydro-magne- sate particles are monodisperse particles having a uniform shape and size.
(3) Synthetic hydro-magneite The average particle size is 0.5 to 2.3 탆, and the particle shape is a shape in which plate-like materials having ridged rims are laminated in various directions.
(4) The synthetic hydro-magne- site particles have a specific surface area of 20 to 55 m 2 / g as measured by the BET method.
As a raw material to be used in the synthesis of the hydro-magneite according to the present invention, a carbonate of an alkali metal such as sodium carbonate, sodium bicarbonate or potassium carbonate can be used as the carbonate, and magnesium chloride, magnesium sulfate and magnesium nitrate can be used as the magnesium ion. As the magnesium ion, magnesium sulfate is preferable.
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When these alkali metal carbonate and magnesium ions are maintained at 80 to 90 캜 in an aqueous solution, a substitution reaction is caused to form a synthetic hydro-magneite. At this time, if the pH of the reactant is not maintained at 10.0 to 11.0, surplus ions are generated in the product, and the size of the particles is large, and the granules are obtained in massive form or the like. That is, if the reaction temperature and the pH of the reactant are not specified, it is not preferable because the hydromagnesite obtained in the prior art can produce a product similar to the hydromagnesite.
Since the reactants are all aqueous solutions, the reaction is preferably carried out for 0.5 to 6 hours, more preferably 0.5 to 3 hours.
Hereinafter, the production of the hydro-magnesite of the present invention will be described in more detail.
When magnesium sulfate is used as the magnesium source and sodium hydrogencarbonate is used as the carbonate source, the sulfate group (SO 4 -2 ) of the magnesium sulfate is combined with the sodium ion (Na + ) to form a stable salt as a byproduct do. If not, 4_ SO 2 is to hinder the formation of the Mg +2 hydro magnesite grain. In addition, the SO 4 - 2 ion destabilizes the surface charge on the surface of the synthesized hydro-magne- sate particles, thereby causing aggregation. Therefore, it is possible to improve the monodispersity of the particles by neutralizing the SO 4 - 2 ions generated as a byproduct of the reaction by introducing Na + ions. Here, when the NaOH is introduced, OH - ions of NaOH form a synthetic hydro- It plays a role of providing a hydroxyl group that can be used to double the particle formation speed and stabilize the particles.
The concentration of the reactant is not particularly limited, but is preferably about 30% by weight or less, more preferably 20% by weight or less, in consideration of the solubility of the reactant.
The hydro-magneite of the present invention produced under the above conditions shows a large difference in particle size, particle size distribution, specific surface area and the like as compared with those produced by the conventional method.
That is, as shown in Fig. 1, the hydro-magneite synthesized according to the conventional method has a particle diameter of 5 to 15 占 퐉, an average particle size distribution of about 15 to 40 占 퐉, a specific surface area of 5 to 10 m2 / g, It can be confirmed that the mass and the plate phase are aggregated. On the other hand, the hydro-magneite prepared according to the present invention has a particle size of 0.5 to 3.0 탆, an average particle size distribution of about 1.8 to 1.9 탆, and a specific surface area of about 30 to 50 m 2 / g. Therefore, it is understood that particles are smaller than those of commercially available products, so that they are excellent in compatibility with resins such as polyurethane, and have excellent chlorine resistance.
Conventionally, among the constituent components of the synthetic hydro-magnesite, those containing components such as zinc and calcium have also been described, but these compounds are mostly solid and therefore not advantageous in the reaction. In addition, since the reaction is not faster with respect to the magnesium ion compound than the carbonate of the monovalent metal, a large amount of the unreacted product may occur, which is not preferable.
The synthetic hydro-magnesite obtained above may be surface-treated in an amount of 0.5 to 10% by weight with respect to the synthetic hydro-magnesite by conventional methods in the art, for example, high-grade alkyl aryl sulfonic acid alkali metal salts such as stearic acid or alkali metal oleate, Can be used.
[Example]
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the scope of the present invention is not limited by these examples.
In the examples,% is as long as there is no separate description. By weight.
Example 1
An aqueous 5-molar solution of magnesium sulfate was prepared in a raw material tank having a capacity of 5 L. Separately, an aqueous solution of 4 moles of sodium carbonate was prepared, and the magnesium sulfate aqueous solution was added over about 15 minutes while stirring. An aqueous sodium hydroxide solution was added dropwise to the reaction mixture, and the mixture was allowed to react for 1 hour while maintaining the pH of the reaction mixture at 10.89.
After completion of the reaction, the reaction mixture was washed with water and hot-air dried at 105 ° C to obtain a white hydrous magnesium composite. As a result of elemental analysis, the chemical formula was Mg 4 .9 (OH) 2.05 (CO 3 ) 4.1 · 4H 2 O. As shown in FIGS. 5 to 7, an electron microscopic image (SEM) image, an X-ray diffraction (XRD) image pattern, and a particle size distribution analysis showed that the average particle size was about 2.03 μm, Lt; 3 > / g.
Examples 2-3 and Comparative Examples 1-3
The reaction was carried out in the same manner as in Example 1, using the reactants shown in Table 1, the pH of the reactants, and the feed time of the raw materials to obtain a synthetic hydro-magneite. The particle sizes of the obtained synthetic hydro-magneite are also described.
*): Comparative Example 1 is a result of synthesis without adjusting the pH of the reactant with an aqueous solution of sodium hydroxide.
An electron microscope (SEM) image, an X-ray diffraction (XRD) image pattern and a particle size distribution diagram of the obtained hydro-magnesite obtained in the comparative example are shown in FIGS. 1 to 4.
As shown in Figs. 5 to 7, the synthetic hydro-magnesite of the present invention has a smaller particle size than that of the comparative example, has a narrow particle size distribution and is uniform, so that it is not necessary to crush separately during use, and it can be confirmed that it is advantageous in compounding raw materials.
As described above, it is confirmed that the excellent properties of the hydro-magnesite of the present invention can be obtained by adjusting the pH of the carbonate and magnesium ion solution using a base such as sodium hydroxide. As can be seen from Table 1 and FIGS. 5 to 7, the hydro-magnesite obtained by adjusting the pH of the reactant in the present invention to 10.0 to 11.0 in the present invention has a small particle size and an average particle size In the case of Comparative Example, that is, when the pH of the reactant is adjusted to be less than 10 or larger than 11, the particle size is as large as not less than 4.3 탆, and the pH of the reactant is not adjusted , The particle size is as large as about 13 mu m and thus the spandex has poor compatibility with the raw material resin and poor compatibility, and is not suitable for use in other applications.
The equipment used for SEM electron microscopy image analysis, X-ray diffraction (XRD) image pattern and particle size analysis in the above-mentioned Examples and Comparative Examples are HITACHI S-4800, SIEMENS D500 and Cilas 1180, respectively.
The hydro-magneite produced according to the above-described method of the present invention has a high degree of monodispersity, an average particle diameter of 0.5 to 2.0 占 퐉, a specific surface area of 20 to 55 m2 / g, Do not. Therefore, it is industrially advantageous because it can be mixed with a raw material resin such as polyurethane, is excellent in chlorine resistance, is uniform in its particles, and can be produced at low cost.
Claims (4)
(1) General formula
Mg 3.8 to 5.2 (OH) 1.8 to 2.15 (CO 3 ) 3.7 to 4.2 mH 2 O
(Wherein m is 0 to 5).
(2) The synthetic hydro-magne- sate particles are monodisperse particles having a uniform shape and size.
(3) Synthetic hydro-magneite The average particle size is 0.5 to 2.3 탆, and the particle shape is a shape in which plate-like materials having ridged rims are laminated in various directions.
(4) The synthetic hydro-magne- site particles have a specific surface area of 20 to 55 m 2 / g as measured by the BET method.
(1) General formula
Mg 3.8 to 5.2 (OH) 1.8 to 2.15 (CO 3 ) 3.7 to 4.2 mH 2 O
(Wherein m is 0 to 5).
(2) The synthetic hydro-magne- sate particles are monodisperse particles having a uniform shape and size.
(3) Synthetic hydro-magneite The average particle size is 0.5 to 2.3 탆, and the particle shape is a shape in which plate-like materials having ridged rims are laminated in various directions.
(4) The synthetic hydro-magne- site particles have a specific surface area of 20 to 55 m 2 / g as measured by the BET method.
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| KR20160117004 | 2016-09-12 | ||
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| KR (1) | KR101885843B1 (en) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102112572B1 (en) * | 2019-10-01 | 2020-05-19 | 한국지질자원연구원 | Preparation of magnesium hydroxide powder from magnesite ore, and magnesium hydroxide powder obtained therefrom |
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| CN111285407A (en) * | 2020-02-23 | 2020-06-16 | 武汉工程大学 | Method for preparing calcium-magnesium-aluminum-iron hydrotalcite by using high-magnesium-phosphorus tailings as raw materials |
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| JP2004059378A (en) | 2002-07-30 | 2004-02-26 | Nittetsu Mining Co Ltd | Method for producing basic magnesium carbonate, and composition or structure containing the basic magnesium carbonate |
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| BE755298A (en) | 1969-08-28 | 1971-02-26 | Solvay | HYDROMAGNESITY WITH MODIFIED MORPHOLOGY AND ITS MANUFACTURING PROCESS |
| GB2156793B (en) * | 1984-04-02 | 1988-01-27 | Commw Scient Ind Res Org | Magnesium oxide production |
| JPH0354233A (en) * | 1989-04-19 | 1991-03-08 | Furukawa Electric Co Ltd:The | Complex flame retardant and flame-retardant resin composition containing same |
| WO1998036112A1 (en) | 1997-02-13 | 1998-08-20 | Asahi Kasei Kogyo Kabushiki Kaisha | Elastic polyurethane fiber and process for producing the same |
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- 2017-09-01 KR KR1020170111560A patent/KR101885843B1/en active IP Right Grant
- 2017-09-01 CN CN201780055908.4A patent/CN109790043A/en not_active Withdrawn
- 2017-09-01 WO PCT/KR2017/009580 patent/WO2018048142A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004059378A (en) | 2002-07-30 | 2004-02-26 | Nittetsu Mining Co Ltd | Method for producing basic magnesium carbonate, and composition or structure containing the basic magnesium carbonate |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102112572B1 (en) * | 2019-10-01 | 2020-05-19 | 한국지질자원연구원 | Preparation of magnesium hydroxide powder from magnesite ore, and magnesium hydroxide powder obtained therefrom |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018048142A1 (en) | 2018-03-15 |
| CN109790043A (en) | 2019-05-21 |
| KR20180029867A (en) | 2018-03-21 |
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