Approaches to High-grade Sintered Magnesia from Natural Magnesite

doi:10.19691/j.cnki.1004-4493.2020.03.002

China's Refractories ›› 2020, Vol. 29 ›› Issue (3): 7-12.DOI: 10.19691/j.cnki.1004-4493.2020.03.002

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Approaches to High-grade Sintered Magnesia from Natural Magnesite

Zongqi GUO¹^,^*(), Deli BI¹, Ying MA², Zhenlin SUN²

1 Yingkou Jindai Technologies, Jiachen Group, Yingkou 115101, China
2 RHI Refractories (Dalian) Co., Ltd., Dalian 116600, China

Online:2020-09-15 Published:2020-09-15
Contact: Zongqi GUO
About author:Guo Zongqi started his refractory career in 1983 after finishing his study in Xi’an University of Architecture & Technology. He then joined Luoyang Institute of Refractories Research to experience many years refractory researches and applications. In 2001, he received his Ph. D degree in Ecole Polytechnique, University of Montreal, Canada. Dr. Guo has continued with refractory R&D activities and management in RHI Magnesita since 2003.

Abstract

Abstract:

It is hard to manufacture high purity, dense sintered-magnesia from natural magnesite in the prevailing process of calcining and sintering, for two reasons: a) impurity, and b) low sintering activity of coarse-grained magnesite. In this paper, 95% MgO magnesite was used as the starting material and finally magnesia of high density (3.47 g ? cm-3) and high purity (98% MgO) was obtained after the flotation purification and a three-step sintering process. An industrial scale of the beneficiation system of natural magnesite was introduced for magnesite purification. In lab experimental, the three-step sintering process was implemented by calcining, hydrating, re-calcining and sintering, which has proven the possibility of densified magnesia from natural magnesite.

Key words: magnesite, flotation, densification, sintering

Zongqi GUO, Deli BI, Ying MA, Zhenlin SUN. Approaches to High-grade Sintered Magnesia from Natural Magnesite[J]. China's Refractories, 2020, 29(3): 7-12.

Figures/Tables 12

Fig. 1 Fracture morphology of magnesite ore

Fig. 2 Microstructures of raw ore with magnesite matrix and bright silicate impurities

Fig. 3 A flow diagram of reverse flotation process

Table 1 Chemical composition of raw magnesite ore and beneficiation outputs /mass%

Magnesite	MgO	Al₂O₃	SiO₂	CaO	Fe₂O₃	LOI
Raw ore	95.82	0.05	2.64	0.96	0.53	51.45
Concentrates	98.26	0.05	0.26	0.95	0.48	51.99
Tailings	53.30	0.93	44.21	0.97	0.45	36.08

Fig. 4 Flotation principle (a) and flotation cells (b)

Fig. 5 Wheel-type filtering (a) and thickening pool (b)

Fig. 6 Reaction activity in relation with calcining temperature of magnesia

Fig. 7 Bulk density of two-step sintered magnesia in relation with sintering temperature

Fig. 8 A flow diagram of three-step sintering process

Fig. 9 X-ray diffraction pattern of magnesium hydrate from CCM

Fig. 10 Bulk density and crystal size of sintered magnesia in relation with calcining temperature of Mg(OH)2

Fig. 11 Microstructure of high density magnesia with 98% MgO

References 10

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Approaches to High-grade Sintered Magnesia from Natural Magnesite

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