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Acid Neutralization by Mining Waste Dissolution under Conditions Relevant for Agricultural Applications

机译：在与农业相关的条件下通过采矿废渣溶解进行酸中和

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The acidification of agricultural soils in high rainfall regions is usually countered by the application of finely ground calcite or dolomite. As this carbonate dissolves, soil pH is raised, but CO 2 is released. Mining activities often produce large quantities of very fine silicate rock-derived powders that are commonly deposited in stockpiles. However, the dissolution of such powders can also result in an increase in pH, without any direct release of CO 2 . Of particular interest are those silicate powders that have a high reactivity and higher capacity for raising pH. In this contribution, we report experimental work addressing the dissolution of various silicate rock-derived powders that were produced during mining activities in Norway under conditions that were representative of weathering in agricultural soils. Three different powders—derived from ?heim dunite, Stjern?ya nepheline syenite, or Tellnes ilmenite norite—were exposed to different acids at pH 4 in unstirred flow cells, and dissolution or leaching kinetics were determined from the changes in the fluid composition. Based on these kinetics, pH neutralization rates were determined for the individual powders and compared to expected values for carbonates. Based on this comparison, it is concluded that the application of silicate rock-derived powder dissolution to replace carbonate-based liming may not be feasible due to slower reaction rates, unless larger quantities of a finer particle size than normal are used. The application of larger volumes of slower-reacting silicates may have the additional benefit of reducing the required frequency of liming.
机译：在高降雨地区，农业土壤的酸化通常可以通过使用细碎的方解石或白云石来解决。随着碳酸盐的溶解，土壤的pH升高，但CO 2释放。采矿活动通常会产生大量非常细的硅酸盐岩石衍生粉末，这些粉末通常沉积在库存中。然而，这种粉末的溶解还可以导致pH值的增加，而不会直接释放CO 2。特别令人感兴趣的是那些具有高反应性和更高的提高pH值能力的硅酸盐粉末。在这项贡献中，我们报告了针对在采矿活动期间代表农业土壤风化的条件下在挪威的采矿活动中产生的各种硅酸盐岩衍生粉末的溶解的实验工作。在未搅拌的流通池中，将三种不同的粉末（源自？heim榴辉石，Stjern？ya霞石正长岩或Tellnes钛铁矿Norite）暴露于pH值为4的不同酸中，并根据流体成分的变化确定其溶解或浸出动力学。基于这些动力学，确定了各个粉末的pH中和速率，并将其与碳酸盐的预期值进行了比较。基于该比较，可以得出结论，除非反应速度较慢，否则除非采用比正常情况更大量的细粒度，否则应用硅酸盐岩石溶解粉末替代碳酸盐基灰泥可能是不可行的。较大量的反应较慢的硅酸盐的应用可能会具有减少所需的石灰添加频率的额外好处。

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