Effect of adding cutting waste on preparation of silicon carbide from silica fume

doi:10.3969/j.issn.1001-1935.2022.01.009

Abstract

Abstract:

SiC powder was prepared using silica fume by carbothermal reduction in order to recycle silica fume.Effects of temperatures (1 550,1 650,1 750,and 1 850 ℃) on the smelting effect without adding cutting waste were studied.Based on the better smelting temperature,the effect of cutting waste addition (accounted for 5%,15%,25%,35%,and 50% of the silica fume addition,by mass) on the preparation of silicon carbide powder was studied.The results show that the optimal smelting temperature is 1 750 ℃,and the SiC content in the product is 92.47 mass%;the optimal addition of cutting waste is 25% of the silica fume addition,and the SiC content in the obtained product is 95.36 mass%.With 25% cutting waste,the purity of SiC in the product is significantly improved,which is of great significance for the recycling of these two kinds of solid waste,environmental protection and solving the problem of resource waste.

Key words: silica fume, cutting waste, carbothermal reduction, silicon carbide, resources recycling

摘要：

为回收利用硅灰,将硅灰通过碳热还原法制备了SiC粉体。研究不添加切割废料时温度(1 550、1 650、1 750、1 850 ℃)对冶炼效果的影响。在较优冶炼温度基础上,研究了切割废料添加质量(分别为硅灰添加质量的5%、15%、25%、35%、50%)对制备碳化硅粉体的影响。结果表明:最佳冶炼温度为1 750 ℃,此时产物中SiC含量为92.47%(w);切割废料最优加入量为硅灰添加质量的25%,得到的产物中SiC含量为95.36%(w)。切割废料加入量为硅灰添加质量的25%时,显著提高了产物中SiC的纯度,对实现两种固废共同回收利用,环境保护以及解决资源浪费问题具有重要的意义。

关键词: 硅灰, 切割废料, 碳热还原, 碳化硅, 资源回收

CLC Number:

TQ175

Wang Bo, Zhou Tong, Ding Xu, Guo Zhicheng, Zhuang Yanxin, Gao Shuaibo, Xing Pengfei. Effect of adding cutting waste on preparation of silicon carbide from silica fume[J]. Refractories, 2022, 56(1): 38-42.

王勃, 周同, 丁旭, 郭志铖, 庄艳歆, 高帅波, 邢鹏飞. 添加切割废料对硅灰制备碳化硅的影响[J]. 耐火材料, 2022, 56(1): 38-42.

Figures/Tables 8

Table 1 Chemical composition of silica fume and cutting waste

原料	w/%
原料	SiO₂	Si	C	SiC	K₂O	其他
硅灰	92.26		3.56	1.83	0.91	1.44
切割废料	13.50	83.99	1.01			1.50

Fig.1 XRD patterns of smelting products at different temperatures

Fig.2 SiC content of smelted products at different temperatures

Fig.3 SEM photos of smelted products at different temperatures

Fig.4 XRD patterns of smelted products at 1 750 ℃ with different cutting waste additions

Fig.5 SiC contents of smelted products at 1 750 ℃ with different cutting waste additions

Fig.6 SEM photos of smelted products at 1 750 ℃ with different cutting waste additions

项目	产量/万t
项目	耐火材料	致密定形耐火制品	保温隔热耐火制品	不定形耐火材料
2016年	2 391.24	1 358.52	46.72	985.99
2017年	2 292.54	1 297.19	51.46	943.90
2018年	2 345.22	1 327.38	54.10	963.74
2019年	2 430.75	1 341.36	58.90	1 030.49
2020年	2 477.99	1 370.94	62.21	1 044.85

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