Synthetic hydromagnesite particle and method for producing same

A technology of hydromagnesite and particles, applied in the field of synthetic hydromagnesite and its preparation, can solve the problems of long reaction time, irregular particle size of hydromagnesite, high reaction temperature, etc.

Inactive Publication Date: 2019-05-21
丹石产业株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has the following disadvantages: the reaction temperature is too high, long reaction time is required, and it is not an economical method. The obtained hydromagnesite will also be pulverized and screened out with a sieve to obtain the water with the required particle size. For magnesite, organic solvents, etc. are required in the purification, so this method is not cu...

Method used

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  • Synthetic hydromagnesite particle and method for producing same
  • Synthetic hydromagnesite particle and method for producing same
  • Synthetic hydromagnesite particle and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] A 5-mol magnesium sulfate aqueous solution was prepared in a raw material tank with a capacity of 5 L. A 4-molar aqueous solution of sodium carbonate was additionally prepared, and poured into the above-mentioned aqueous solution of magnesium sulfate under stirring over about 15 minutes. An aqueous sodium hydroxide solution was dropped on the reactant to keep the pH of the reaction liquid at 10.89, and the reaction was carried out for 1 hour.

[0076] After the reaction, it was washed with water and dried with hot air at a temperature of 105° C. to obtain white powder synthetic hydromagnesite. Carry out elemental analysis, the result chemical formula is Mg 4.9 (OH) 2.05 (CO 3 ) 4.1 4H 2 O. and if Figure 5 to Figure 7 As shown, it was confirmed by electron microscope (scanning electron microscope) image, X-ray diffraction (XRD) image pattern and particle size distribution analysis. 2 / g.

Embodiment 2～ Embodiment 3 and comparative example 1～ comparative example 3

[0078] Synthetic hydromagnesite was obtained by reacting in the same manner as in Example 1 above with the reactants described in the table below, the pH of the reactants, and the time for feeding raw materials. Also, the particle size of the obtained synthetic hydromagnesite is described.

[0079] Table 1

[0080]

Example 2

Example 3

Comparative example 1

Comparative example 2

Comparative example 3

MgSO 4

5 moles

5 moles

5 moles

5 moles

5 moles

Na 2 CO 3

4 moles

4 moles

4 moles

4 moles

4 moles

pH value of reactant

10.54

10.28

9.12*)

9.61

11.20

temperature reflex

85℃

85℃

85℃

85℃

85℃

Raw material input time

15 minutes

15 minutes

15 minutes

15 minutes

15 minutes

Reaction time

1h

1h

1h

1h

1h

Particle size (μm)

1.87

1.49

13.07

5.72

4.34

[0081] *): Comparative example 1 is the...

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Abstract

Disclosed are a synthetic hydromagnesite particle and a method for producing the same, the synthetic hydromagnesite particle being characterized by the following (1) to (3): (1) general formula Mg<3.8-5.2>(OH)<1.8-2.15>(CO<3>)<3.7-4.2>.mH<2>O (wherein, m is 0 to 5.); (2) the synthetic hydromagnesite has an average particle size of 0.5 to 2.3[mu]m, and the particle has a form in which plate-like materials having uneven edges are stacked in several directions; and (3) the synthetic hydromagnesite particle has a specific surface area of 20 to 55 m<2>/g as measured by a BET method.

Description

technical field [0001] The invention relates to synthetic hydromagnesite and a preparation method thereof. In more detail, it relates to synthetic hydromagnesite particles with high monodispersity and its preparation method: controlling the pH value and reaction temperature of the reaction substance, adding sodium hydroxide to control the residual ions generated during synthesis, and preventing aggregation between particles . Background technique [0002] Hydromagnesite is a hydrous carbonate mineral of magnesium. Its properties are low hydrothermal minerals. It forms veins in serpentinite and magnesium-rich metamorphic igneous rocks. It has been confirmed that it is mined and produced in Australia, California, and other places. As we all know, there are calcite, arsenite (argonite) or weathering as symbiotic minerals. The chemical formula of hydromagnesite is Mg 5 (OH) 2 (CO 3 ) 4 nH 2 O (n is 5 or less), crystallographically characterized by monoclinic crystals and t...

Claims

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Application Information

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IPC IPC(8): C01F5/00
CPCC01F5/00C01P2004/20C01P2004/61C01P2006/12
Inventor 林炳吉朴忠孝
Owner 丹石产业株式会社
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