摘要:
为了改善矿渣棉纤维质量,采用铁尾矿对高炉渣进行调质,研究酸度系数对调质高炉渣黏度、熔化性温度和矿物组成的影响规律,并在此基础上采用离心试验证实了改变酸度系数能够优化纤维质量。结果表明:随着铁尾矿添加比例的升高,调质高炉渣的酸度系数Mk增加,调质高炉渣熔化性温度先降低后升高,熔化性温度对应的黏度值逐渐增加,调质高炉渣中不再有矿物析出,熔渣凝固后全部为非晶相。说明高炉渣开始由短渣特性转变为长渣特性,且在符合矿渣棉成纤黏度条件下,熔渣黏度变化趋于平缓,因此对高炉渣进行调质可以拓宽成纤温度区间范围,易于高炉渣纤维化控制;且酸度系数Mk提高,进一步可以改善纤维直径,提高纤维的使用性能。
关键词:
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高炉渣 /
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矿渣棉 /
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调质剂 /
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黏度 /
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酸度系数
Abstract:
In order to improve the quality of slag fiber,iron tailings were used for adjusting the blast furnace slag. The effect of acidity on the viscosity,melting temperature and mineral compositions of the adjusted blast furnace slag was investigated,and the quality of slag fiber was evidenced to be improved by changing the acidity coefficient on the basis of centrifuge tests. The results show that with the increase of the addition of iron tailings,the acidity coefficient Mk of the adjusted blast furnace slag increases while its melting temperature decreases first and then increases,and the viscosity value corresponding to the melting temperature increases gradually. Simultaneously,there is no mineral precipitated in the adjusted blast furnace slag,with all the amorphous phase produced after solidification of the molten slag. It is shown that with addition of iron tailings,the properties of blast furnace slag change from short to long characteristic,and slag viscosity changes slowly under the condition of fiber formation. Consequently,the temperature range for fiber formation can be expanded by adjusting the blast furnace slag,and it's beneficial to control the fiber formation. The diameter of the slag fiber with a better using performance can be increased with increase of acidity coefficient Mk.