Effect of associated minerals in Zhundong high-iron coal on the apparent properties of coal water slurry
The Zhundong Heishan mining area,particularly the Jiangjunmiao No.2 mine,is abundant in high iron coal reserves,a source of high-quality power coal.The impact of primary associated minerals in coal on the performance of coal water slurry was focused on,using these coal samples.The samples,varying by mineral content,type,and distribution rule,were divided into different density grades via the coal flotation and sedimentation separation method,facilitating an evaluation of their influence on slurry ability.Energy dispersive spectrometer(EDS),X-ray diffraction(XRD),and X-ray fluorescence(XRF)were utilized to pinpoint the elemental content and min-eral composition in the samples.Correlations between different mineral element content and pulping performance were calculated using SPSS software.It was observed that the density of Zhundong high iron coal primarily concentrated in the 1.40-1.50 g/cm3 range,re-presenting 55.88％of the total.Coal samples exceeding 1.50 g/cm3 in density accountes for roughly 4.88％.Pyrite,ferric sulfate,kaolin,and quartz content increased proportionally to the coal sample density.Coal samples exceeding 1.50 g/cm3 in density contained high levels of associated minerals,with Al,Si,S,and Fe reaching their peak.In this case,the Fe mass fraction increases from below 0.5％to 5.97％.Coal water slurry samples displayes a decrease in viscosity and stability as coal sample density increases.The coal water slurry vis-cosity generated by the ZD1 coal sample,with less than 1.40 g/cm3 density,stand at 960 mPa·s,with a water precipitation rate of 1.37％.Meanwhile,the slurry sample generated by coal samples exceeding 1.50 g/cm3 in density is too thin,reducing slurry viscosity to 320 mPa·s and elevating the water precipitation rate to 9.09％.The correlation analysis reveales that the associated Na,Mg,and Ca ele-ments in coal are relatively evenly distributed across coal samples at all density grades,and showes no clear correlation with the slurry forming performance.Conversely,the contents of Al,Si,S,and Fe elements are significantly and extremely significantly negatively corre-lated with the slurry viscosity and stability,respectively.In other words,the higher the pyrite,ferric sulfate,kaolin,and quartz mass fractions are,the more pronounced the downward trend in the viscosity and stability of the coal water slurry are.
Zhundong high-iron coalfloating and sinking separationcoal sample physical property analysiscoal water slurry perform-ance
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