盐湖水氯镁石合成三方硼镁石的结晶机理及动力学研究

doi:10.19964/j.issn.1006-4990.2022-0734

Abstract

Abstract:

Magnesium borates are important industrial chemicals which are widely used in glass，ceramics and plastic polymers，etc.Being aimed at improving the production cost of macallisterite from magnesium oxide，the synthesis of the macallisterite by hydrothermal method was investigated by using the salt lake bischofite as the magnesium source，and the sodium pentaborate（or boric acid and sodium hydroxide） as the boron source.The crystallization mechanism and kinetics of the macallisterite were also investigated by Raman spectroscopy and kinetics method.The results showed that the crystalline solid phases were dependent with the temperature and material mole ratios.The optimum temperature condition was 25 ℃ or room temperature and the corresponding mole ratio of sodium pentaborate and bischofite was 1:8，in which could precipitate a high purity crystalline solid phase with shorter time.The Raman results indicated that the addition of bischofite facilitated the polymerization of the B₃O₃（OH）₄^- anion into the B₆O₇（OH）₆^2- anion and the alkali metal sodium pentaborate solution transferred into the supersaturation of alkaline-earth metal magnesium borate，which was favorable for the crystallization of insoluble magnesium hexaborate（macallisterite）.The crystal growth mechanism was controlled by the multi-nucleus surface reaction.This study could give a rapid synthetic method for macallisterite with simple process and low cost and also provide useful information for the comprehensive utilization of magnesium resources.

Key words: bischofite, sodium pentaborate, macallisterite, crystallization mechanism, kinetics

CLC Number:

TQ132.2

PENG Jiaoyu, TAN Yuqin, YANG Keli, DONG Yaping, ZHANG Bo, LI Wu. Study on crystallization mechanism and kinetics of macallisterite synthesized with bischofite from salt lake[J]. Inorganic Chemicals Industry, 2023, 55(10): 56-62.

Figures/Tables 11

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References 26

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温度/ ℃	n（NaB₅O₈）:n（MgCl₂）	XRD鉴定
25	1:4	MgO·3B₂O₃·7.5H₂O
	1:8	MgO·3B₂O₃·7.5H₂O
	1:12	MgO·3B₂O₃·7.5H₂O+MgCl₂·6H₂O+H₃BO₃（少量）
	1:16	MgO·3B₂O₃·7.5H₂O+MgCl₂·6H₂O+H₃BO₃（少量）
40	1:4	MgO·3B₂O₃·7.5H₂O
	1:8	MgO·3B₂O₃·7.5H₂O
	1:12	MgO·2B₂O₃·9H₂O+MgCl₂·6H₂O+NaCl（少量）
	1:16	MgO·3B₂O₃·7.5H₂O+MgO·3B₂O₃·6H₂O+H₃BO₃ （少量）
60	1:4	MgO·3B₂O₃·7.5H₂O
60	1:8	MgO·3B₂O₃·7.5H₂O

原料组成	温度/ ℃	n（NaB₅O₈）:n（MgCl₂）	XRD鉴定
水氯镁石+五硼酸钠固体	25	1:8	MgO·3B₂O₃·7.5H₂O
水氯镁石+五硼酸钠溶液*	25	1:8	MgO·3B₂O₃·7.5H₂O
水氯镁石+五硼酸钠溶液*	25	1:8	MgO·3B₂O₃·7.5H₂O
氯化镁饱和老卤+五硼酸钠溶液*	25	1:8	MgO·3B₂O₃·7.5H₂O
氯化镁饱和老卤+五硼酸钠溶液*	25	1:8	MgO·3B₂O₃·7.5H₂O

项目	w（MgO）	w（B₂O₃）	w（H₂O）
实验值	10.48	54.44	35.66
理论值	10.49	54.35	35.16

动力学模型	残差平方和S	速率常数k	拟合优度R²
MA-1	0.080 1	0.141 3	0.986 7
MA-2	0.308 7	0.110 3	0.948 3
MA-3	1.022 7	0.091 9	0.831 4
MA-4	1.786 7	0.086 2	0.707 4

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Study on crystallization mechanism and kinetics of macallisterite synthesized with bischofite from salt lake

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