加压碳化法制备碱式碳酸镁新工艺研究

Abstract

Abstract: Hydromagnesite is a kind of filler and dispersant with excellent performance,and now it is mainly produced from dolomite carbonization technology or magnesia-sulfuric acid-ammonium hydrogen carbonate method which both have complex process and serious pollution.A new process was proposed for preparation of hydromagnesite at elevated pressure with magnesium hydroxide slurry and CO₂ gas as raw materials.Effects of reaction temperature,reaction time,and partial pressure of CO₂ gas on the purity of product were studied.Morphology,crystal structure,and thermal decomposition of the product were characterized by SEM,XRD,and TG-DTA analysis respectively.Result showed that the product with good purity and uniform hexagonal lamellar morphology can be obtained at the reaction temperature of 120 ℃,CO₂gas partial pressure of 0.22 MPa,and reaction time of 3 h. 

Key words: hydromagnesite, magnesium hydroxide, carbonization at elevated pressure

CLC Number:

TQ132.2

ZHANG Xiang-Jing, ZHAO Sa, ZHANG Zhi-Kun, GUO Xin-Xin, LIU Run-Jing, HU Yong-Qi. New process for preparation of hydromagnesite by carbonization at elevated pressure[J]. INORGANICCHEMICALSINDUSTRY, 2011, 43(10): 39-.

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Inorganic Acid-Base-Salt Committee of CIESC

New process for preparation of hydromagnesite by carbonization at elevated pressure

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