含硅熔渣的化学组成特征与农业化学行为研究

Study on characteristics of chemical component and agrochemistry behavior of slog containing silicon

对重庆市几种主要含硅熔渣的化学组成和农业化学行为研究结果表明,含硅熔渣的主要化学组成为SiO2、CaO、Al2O3、MgO、Fe2O3、MnO,其含量分别为260 7～382 8、1 7～494 6、43 6～338 1、0 2～84 5、4 9～378 6、0 9～106 7g/kg,其中SiO2含量最为稳定;锌、铜、钼、硼等微量元素的含量与土壤大致相同;重金属元素含量绝大多数未超过国家规定的控制标准,并以集合体的形态存在,活性低。含硅熔渣有效硅(SiO2)含量在0 79～9 11g/kg之间,其硅的释放速度因硅渣类型不同而异。Freundlish方程能很好地拟合含硅熔渣中硅的释放过程,其b值能反映硅释放能力的大小。含硅熔渣中磷的有效性低,对加入磷具有较强的吸附固定作用,固定量随熔渣细度和含水量的增加而显著增大。含硅熔渣无论是直接磨细施入土壤中作为硅肥,还是以熔渣为原料生产含硅多元复合肥,都必须考虑熔渣对磷的固定作用。

The characteristics of chemical component and agrochemistry behavior of slog containing silicon were studied in this paper. The results showed that the main chemical components in slog containing silicon were SiO2, CaO, Al2O3, MgO, Fe2O3, MnO,their contents were individually 260.7-382.8、1.7-494.6、43.6-338.1、0.2-84.5、4.9-378.6、0.9-106.7 g/kg. The content of SiO2 was the most stable; There were almost the same microelement contents of Zn、Cu、Mo、B in slog as that in soil. The most contents of heavy metal were below standards provided by country and they existed in combining form and low activity. The content of available SiO2 was 0.79-9.11 g/kg, the release rate of P were different in different types of slog. Freundlish formula could simulate well to the release process of silicon in slog containing silicon, and the parameter b value could reflect release ability of P. The availability of P in slog containing silicon was low. Slog containing silicon had effects of absorption and fixation to P added, and fixation amount increased obviously by the increasing of fineness and water content of slog. No matter slog containing silicon was manured into soil after size degradation or used as material of multivariate compound fertilizer, the fixation of slog to P must be taken into account.