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    煤矸石与辅料复配制备土壤化基质的试验

    Experimental study on the preparation of soil-based substrate using composite coal gangue and additives

    • 摘要: 煤矸石大量堆存会产生占用耕地及环境污染等问题,消纳煤矸石亟待解决。为此,从常见原材料出发,利用煤矸石、辅料为原料,按照不同配比混合制备土壤化基质,进行农作物盆栽试验,研究不同配比下农作物生长态势,优选适宜于农作物生长的基质配比;在此基础上选用最佳配比重复进行盆栽试验,对基质重金属潜在危害和农产品安全进行评价;后期按照相同复配比进行场地试验,验证煤矸石土壤化基质的有效性和可行性。结果表明:利用煤矸石、辅料重构土壤具有可行性,煤矸石∶辅料(体积比)=7∶3为最优配比;土壤化基质重金属含量符合国家标准,场地试验种植的农作物未发现污染超标,达到“固废协同”的效果,可为煤矸石土壤化利用和矿区生态修复提供理论依据和技术支撑。

       

      Abstract: The large-scale stockpiling of coal gangue causes issues such as the occupation of arable land and environmental pollution. Effective methods for the disposal and utilization of coal gangue are urgently needed. To this end, starting from common raw materials, coal gangue and auxiliary materials were used as raw materials to prepare soil-like substrates by mixing them in different proportions. Pot experiments were conducted to observe crop growth under various mixing ratios. The optimal substrate composition suitable for crop growth was selected. Based on this, pot experiments were repeated with the best ratio to evaluate the potential heavy metal risks in the substrate and the safety of agricultural products. Later, field trials were conducted with the same mixture to verify the effectiveness and feasibility of coal gangue-based soil substrates. The results show that reconstructing soil with coal gangue and additives is feasible. The optimal volume ratio of coal gangue to additives is 7∶3. The heavy metal content in the soil-like substrates meets national standards. Crops grown in field trials showed no excessive pollution, achieving the effect of "solid waste coordination". It provides a theoretical basis and technical support for the soil utilization of coal gangue and ecological restoration in mining areas.

       

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