碱性粉煤灰对煤矸石硫污染防治技术

Alkali-fly ash preventing technic on sulfur pollution of coal wastes

针对煤矿废弃物高硫煤矸石产生的硫污染,根据循环经济的原理,利用废弃物粉煤灰的碱性来解决煤矸石硫污染问题.采用柱状淋溶试验,通过碱性粉煤灰参与下的不同配比工艺来研究煤矸石硫污染防治的技术,以降低煤矸石硫化对土壤和水体的污染.研究结果表明,不同粒径的煤矸石分别与粉煤灰以等体积分2层(煤矸石为20 cm,粉煤灰为20 cm)配比和以等体积分4层(煤矸石和粉煤灰相间隔成4层,每层厚10 cm)配比处理均能有效地提高淋滤液pH值,降低淋滤液盐离子浓度,减少硫脱出量.对硫污染防治效果中2层配比厚20 cm粉煤灰处理优于4层配比每层厚10 cm粉煤灰处理,粉煤灰对淋滤液硫污染防治的贡献率最高达到64%,显示了粉煤灰在煤矸石硫污染治理中较好的应用潜力.

Coal wastes caused high concentration sulfur pollution. According to the theory of cycle economy, adding alkali-fly ash as two kinds of different ratio （ two and four layers） to coal wastes to remediation sulfur pollution. The pole leaching experiment was studied. The results show that fly ash enhances its pH, decreases its Ec and reduces its sulfur content in leaching solution. Effects of sulfur prevention show two layers treatment （ fly ash 20 cm depth） better than four layers treatment （fly ash 10 cm per depth）. Contribution rate of fly ash on sulfur prevention reaches 64% more. Fly ash showed high potential on remediation of coal wastes.