Properties of forsterite-spinel composite materials prepared by high-carbon ferrochrome slag

doi:10.3969/j.issn.1001-1935.2021.06.007

Abstract

Abstract:

Forsterite-spinel composite materials were prepared using high-carbon ferrochrome slag as the starting material.Effects of the heat treatment temperatures (1 150,1 200,and 1 250 ℃) on properties of the prepared materials were researched.The results show that there are well developed forsterite and spinel in the high-carbon ferrochrome slag,which can act as the support skeleton for forsterite-spinel composite materials.Heat treatment temperatures can significantly affect the contents of the phases in the composites,and the net-structured spinel crystal in the composite materials can improve the thermal shock resistance of the specimens.The spinel favors the solid-solution of the free chromium ions,their leaching concentration decreases as the heat treatment temperature increases.When the temperature is 1 200 ℃,the composite materials have the best comprehensive performance,with the CCS of 108.8 MPa,the thermal shock resistance of 8 cycles,and the total chromium ion (Cr³⁺ and Cr⁶⁺) leaching mass concentration of 0.14 mg·L^-1.

Key words: high-carbon ferrochrome slag, forsterite-spinel, high strength, thermal shock resistance

摘要：

以高碳铬铁渣为主要原料制备了镁橄榄石-尖晶石复相材料,研究了热处理温度(1 150、1 200和1 250 ℃)对复相材料性能的影响。结果表明:高碳铬铁渣中含有发育良好的镁橄榄石及尖晶石,可作为镁橄榄石-尖晶石复相材料的支撑骨架;不同热处理温度会显著影响试样中物相的含量,试样中存在网状结构的尖晶石晶体可提高试样的抗热震性; 尖晶石相的存在有利于固溶游离的铬离子,随着热处理温度的升高,铬离子浸出浓度减小;当热处理温度为1 200 ℃时,试样的综合性能最好,常温耐压强度达108.8 MPa,抗热震性达到8次,总铬离子(Cr³⁺、Cr⁶⁺)浸出质量浓度为0.14 mg·L^-1。

关键词: 高碳铬铁渣, 镁橄榄石-尖晶石高强度, 高强度, 抗热震性

CLC Number:

TQ175.9

Feng Ze-cheng, Zhao Huizhong, Han Huanshi, Li Yichong, Ma Jiuhong, Yang Yang. Properties of forsterite-spinel composite materials prepared by high-carbon ferrochrome slag[J]. Refractories, 2021, 55(6): 491-497.

冯泽成, 赵惠忠, 韩欢师, 李轶翀, 马九宏, 杨阳. 高碳铬铁渣制备镁橄榄石-尖晶石复相材料的性能研究[J]. 耐火材料, 2021, 55(6): 491-497.

Figures/Tables 13

Fig.1 Phase diagram of MgO-Al2O3-SiO2

Fig.2 XRD pattern of high-carbon ferrochrome slag

Fig.3 Microstructure of high-carbon ferrochrome slag

Table 1 EDS spectrum analysis of zones in Fig.3

区域	x/%
区域	Al	Mg	Cr	Si	O
点1	24.50	13.67	2.28	—	59.55
点2	4.22	22.91	—	11.50	61.38

Table 2 Bulk density,apparent porosity and cold crushing strength of samples treated at different temperatures

项目	处理温度/℃
项目	1 150	1 200	1 250
体积密度/(g·cm³)	1.96	2.15	2.25
显气孔率/%	40	33	31
耐压强度/MPa	15.7	108.8	92.7

Fig.4 XRD patterns of samples treated at different temperatures

Fig.5 XRD refinement pattern of samples treated at different temperatures

Table 3 Lattice constant and cell volume of spinel at different temperatures

温度/℃	晶格常数/nm	晶胞体积/nm³
1 150	0.812 600(4)	0.536 59(5)
1 200	0.812 059(4)	0.535 51(5)
1 250	0.811 634(4)	0.534 67(5)

Fig.6 Effects of treatment temperatures on phase contents

Fig.7 Effect of treatment temperatures on thermal shock resistance

Fig.8 Microstructure of samples treated at different temperatures

Table 4 EDS spectrum analysis of zones in Fig.8

区域	x/%
区域	Al	Mg	Cr	Fe	Si	O
点1	22.07	24.81	2.32	0.49	—	50.30
点2	32.30	7.51	0.33	—	—	59.85
点3	7.88	26.28	2.05	4.30	—	59.49
点4	20.39	16.87	1.99	2.25	1.69	56.81
点5	—	29.82	—	—	9.89	57.78
点6	25.31	30.03	1.91	—	—	42.75

Fig.9 Total chromiumion leaching mass concentration of samples treated at different temperatures

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