Basaltic rocks are being considered as a key host for carbon dioxide (CO₂) storage. This is a function of their global distribution and relative reactivity, resulting in CO₂ mineralization. However, the reactivity of mafic minerals allows for reaction and sequestration of other gases associated with point source emissions. Though many mechanisms exist to separate CO₂ from flue gas, these can be costly system additions for existing point source emitters. In this study, we model the effect of adding minor amounts of SO₂ to CO₂ during ex-situ mineral carbonation of basalt samples from Nevada, USA. We compare reaction path geochemical models at temperatures between 0° and 200 °C and at three different SO₂ concentrations. Results from these models are compared to published data evaluating the interaction of these samples with CO₂ only. The models have carbon trapped in four minerals (magnesite, siderite, dolomite, and dawsonite). Sulfur is sequestered as one sulfide (pyrite) and up to four sulfates (alunite, anhydrite, gypsum, and thenardite). With added SO₂, between 43–161 grams of carbon are trapped per kg rock reacted. These models show -25 % to +18 % change in carbon sequestration, though decreases are more prevalent with increasing SO₂. One major issue with adding SO₂ as a reactant is pyrite precipitation, which may result in acid rock drainage from the reaction product. However, adding NO₂ as a reactant inhibits pyrite formation by increasing oxygen fugacity. Ultimately, these methods can be used as an initial, inexpensive screening tool when evaluating between potential mafic rock carbonation projects.

玄武岩被认为是二氧化碳（CO ₂）储存的主要宿主。这取决于它们的整体分布和相对反应性，从而导致CO ₂矿化。然而，镁铁矿物质的反应性允许与点源排放物相关的其他气体发生反应和隔离。尽管存在许多将CO ₂与烟气分离的机制，但对于现有的点源发射器而言，这些可能是昂贵的系统添加。在这项研究中，我们的模型添加SO少量的效果₂到CO ₂从美国内华达州玄武岩样品易地矿物碳酸化过程中。我们比较了温度介于0°和200°C之间以及三种不同SO下的反应路径地球化学模型₂浓度。将这些模型的结果与发布的数据进行比较，这些数据仅评估了这些样品与CO ₂的相互作用。这些模型将碳捕获在四种矿物（菱镁矿，菱铁矿，白云石和片钠铝石）中。硫被螯合为一种硫化物（黄铁矿）和最多四种硫酸盐（褐铁矿，硬石膏，石膏和芒硝）。添加了SO ₂，43-161克的碳之间被捕获每公斤岩石反应。这些模型显示固碳变化在-25％到+ 18％之间，尽管随着SO _2的增加其减少更为普遍。加入SO ₂作为反应物的一个主要问题是黄铁矿沉淀，这可能导致酸性岩石从反应产物中排出。但是，添加NO ₂作为反应物通过增加氧逸度来抑制黄铁矿的形成。最终，当在潜在的镁铁质岩石碳化项目之间进行评估时，这些方法可以用作廉价的初始筛选工具。