Synthetic hydromagnesite particle and method for producing same

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...

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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 currently used

[0019] As mentioned above, although the preparation and utilization of synthetic hydromagnesite particles are disclosed, the time required for the preparation is long or uneconomical, or the particle size of the obtained hydromagnesite particles is too irregular or the particle size is too large. Large, so it cannot be said that the use of spandex as an additive is satisfactory

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