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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Acid-base accounting of unburned coal from underground coal gasification at Majuba pilot plant
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Acid-base accounting of unburned coal from underground coal gasification at Majuba pilot plant

机译：Majuba试点植物地下煤气化未燃煤的基础核算

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摘要

Underground coal gasification (UCG) is an unconventional mining method that converts coal in situ into a fuel gas that can be used for electricity generation. Residue products from UCG have the potential to leach into surrounding groundwaters. The geochemistry and leaching dynamics of these products are explored in this study. The products include char, ash, and the heat-affected zone in the surrounding rocks. Core samples from the pilot plant at Majuba are the first ever to be recovered from a UCG cavity in Africa, and they give key insights into the geochemistry of the gasification zone. Mineralogical and chemical analyses were performed on the samples, and acid-base accounting (ABA) was used to predict the acid-producing capacity of the gasification zone, particularly for char samples. Some of the char contained pyrite, although not all samples were acid-producing as determined by the ABA analysis. The ABA results showed that some of the unburned coal has moderate levels of sulphur, which could be the driving medium for acidic conditions. The ABA analysis indicated that water in contact with the gasification zone would eventually have a pH lower than 7, which could lead to acid rock drainage. These results form part of a preliminary investigation into the geochemistry of the reaction zone, post gasification.
机译：地下煤气化（UCG）是一种非常规采矿方法，可将煤转化为可用于发电的燃料气体。来自UCG的残留物产品有可能浸入周围地下水中。本研究探讨了这些产品的地球化学和浸出动态。该产品包括周围岩石中的炭，灰和热影响区域。 Majuba试点植物的核心样本是第一个从非洲UCG腔中恢复的首次，他们将关键见解进入气化区的地球化学。对样品进行矿物学和化学分析，并使用酸基础核算（ABA）来预测气化区的酸生产能力，特别是对于焦炭样品。一些炭含有硫铁矿，尽管并非所有样品都是酸生产，如ABA分析所确定的。 ABA结果表明，一些未燃烧的煤具有中等水平的硫，这可能是酸性条件的驱动介质。 ABA分析表明，与气化区接触的水最终具有低于7的pH，这可能导致酸岩排水。这些结果形成了对气化后的反应区地球化学的初步调查的一部分。

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