高硫煤矸石不同细度与用量对苏打盐化土化学性状的影响

Effect of Applying Rates and Fineness of High-sulfur Coal Gangue on Chemical Properties of Soda-saline Soil

根据山西省大同盆地苏打盐化土的特征,选取高硫煤矸石为研究对象,通过室内培养试验,重点研究了高硫煤矸石不同细度和不同用量对苏打盐化土的p H值、电导率(EC)、代换性钠离子含量和碱化度(ESP)等化学性状的影响。结果表明,施用高硫煤矸石后,苏打盐化土的p H值、代换性钠离子含量、碱化度(ESP)均有所降低,较对照分别降低了15.73%,28.57%,25.04%;而且随着高硫煤矸石用量的增加,各项指标的变化幅度增大,其中,以细度为0.21 mm、用量为9.6 t/hm2的高硫煤矸石对苏打盐化土的改良效果最为显著;施用高硫煤矸石会导致大量外源离子的输入,使苏打盐化土EC值与对照相比均有所升高,但通过调整土壤中盐离子的结构,使产生毒害作用的钠离子含量减少,对苏打盐化土起到良好的改良作用。

Soda-saline soil is one of the most widely distribution soil types in Datong Basin of Shanxi province. Chemistry amendments is a common method of improving soda-saline soil. There is a large number of high-sulfur coal gangue resources in Shanxi province, which has low utilization rate and caused serious environmental pollution. Based on the characters of soda-saline soil in Datong Basin, high-sulfur coal gangue was selected, using cultivating indoor, leaching experiment of soil improvement was operated, the chemical properties of the soda-saline soil were analyzed. The results showed that by using high-sulfur coal gangue, the pH, the content of Na~, ESP of the soda-saline soil were significantly lower than that of CK. There were regular changes with the increase of the application amount of high-sulfur coal gangue. It was found that there was the most significant improvement effect when the fineness was 0.21 mm and the application amount was 9.6 t/hm2 of the high-sulfur coal gangue. Soil pH, Na~ content and ESP decreased than CK by 15.73%, 28.57%, 25.04%, respectively. Applying high-sulfur coal gangue would lead to a large number of foreign ions input which made soil EC increased, respectively. But by adjusting the saltions in soil structure, the toxic effects of Na~ content were reduced, which led to an improvement effect on soda-saline soil.