水镁石分解产物特性研究

doi:10.19964/j.issn.1006-4990.2024-0194

Abstract

Abstract:

To understand the difference in the characteristics of calcination products between brucite and magnesite，firstly，using brucite as the raw material，the decomposition rate，phase composition，microstructure and other properties during the calcination process were characterized using thermogravimetric analyzer，X-ray diffractometer，physical adsorption instrument，etc.The effects of CO₂ atmosphere，calcination temperature，and holding time on the activity of the product were studied，and compared with the calcined product of magnesite.The results showed that as the calcination temperature increased，the decomposition rate of brucite increased，and specific surface area decreased gradually.The grain size and coloration time decreased sharply and then increased before and after the calcination temperature reached 700 ℃.The activity was determined by both decomposition rate and microstructure.At the same calcination temperature（700 ℃），the increase in holding time had almost no effect on the decomposition rate and product properties.Compared to the results under the atmosphere of N₂，the decomposition temperature of brucite increased by 65 ℃，the grain size reduced，and the specific surface area and activity increased in the presence of CO₂.The activity of products derived from brucite decomposition was higher obviously than that from magnesite，mainly due to the higher content of active MgO after calcination of brucite.This study would provide basic data for the utilization of brucite resources.

Key words: brucite, activity, calcination, magnesium oxide

CLC Number:

TQ523

LI Jiaxin, ZHANG Hong, XIE Jiaqi, BI Haoran, LIU Xuejing. Study on characteristics of brucite calcination product[J]. Inorganic Chemicals Industry, 2025, 57(5): 39-45.

Figures/Tables 10

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煅烧条件	N₂		CO₂
煅烧条件	晶粒尺寸/nm	比表面积/ （m²·g^-1）	晶粒尺寸/nm	比表面积/ （m²·g^-1）
600 ℃、1 h	1.05	43.94	0.84	58.88
700 ℃、1 h	0.29	39.05	0.26	43.62
800 ℃、1 h	0.34	30.22	0.29	41.06
1 000 ℃、1 h	0.45	20.17	0.51	11.88
700 ℃、6 h	0.30	40.43	0.27	46.71

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Study on characteristics of brucite calcination product

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