煅烧白云石粉制备微纳米级圆片状氢氧化镁

doi:10.19964/j.issn.1006-4990.2021-0169

Abstract

Abstract:

Micro-nano-sized high-purity（99.30%） round flake magnesium hydroxide as the flame retardant was prepared from dolomite by ammonia method.The effect of reaction temperature,ammonia-passing rate,ammonia-magnesium molar ratio on the dispersion and morphology of magnesium hydroxide were investigated.The optimal process conditions were determined：reaction temperature was 80 ℃,ammonia-passing rate was 150 mL/min,and ammonia-magnesium molar ratio was 23∶1.The morphologies,structures,size distributions and stability of products were characterized through scanning electron microscope,transmission electron microscope,X-ray diffractometer,laser particle analyzer,thermogravimetric analyzer and whiteness meter.The results showed that the prepared round flake micro-nano-sized magnesium hydroxide flame retardant had high dispersibility,complete crystal shape,uniform particle size with D₅₀of 2.493 μm,D₉₀ of 6.132 μm,diameter of about 5.7 μm,thickness of about 0.7 μm and length thickness ratio of about 8∶1.The stability was good,the ignition loss was 31.03%,and the whiteness was 97.4,which was higher than industrial magnesium hydroxide industry standard.

Key words: dolomite, round flake magnesium hydroxide, flame retardant

CLC Number:

TQ132.2

FAN Tianbo,HU Tingting,HAN Dongxue,JIA Xiaohui,ZHAO Yibo,WANG Xin′an,GUO Hongfan,LI Li,LIU Yunyi. Preparation of micro-nano round flake magnesium hydroxide from calcined dolomite powder[J]. Inorganic Chemicals Industry, 2022, 54(1): 29-33.

Figures/Tables 8

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Preparation of micro-nano round flake magnesium hydroxide from calcined dolomite powder

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