Inorganic Chemicals Industry >
Preparation of micro-nano round flake magnesium hydroxide from calcined dolomite powder
Received date: 2021-03-19
Online published: 2022-03-14
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 D50 of 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
Tianbo FAN , Tingting HU , Dongxue HAN , Xiaohui JIA , Yibo ZHAO , Xin′an WANG , Hongfan GUO , Li LI , Yunyi LIU . Preparation of micro-nano round flake magnesium hydroxide from calcined dolomite powder[J]. Inorganic Chemicals Industry, 2022 , 54(1) : 29 -33 . DOI: 10.19964/j.issn.1006-4990.2021-0169
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