淮南矿区煤灰中六价铬的含量及其危险性评价

Content and Hazard Assessment of Chromium (Ⅵ) in Coal Ash of Huainan Coalfield

为了研究淮南矿区煤灰中六价铬含量特征,采用微波碱消解法提取煤灰,并通过电感耦合等离子体原子发射光谱法(ICP-OES)测定六价铬的含量。结果表明,淮南矿区煤灰中六价铬的含量平均值为0.77 mg/kg,变化范围为0.70~0.89 mg/kg之间,总体上,各矿煤灰中六价铬含量值较一致,没有较大差异。煤灰中六价铬含量存在一定的不安全性,电厂在排放飞灰时,需要做好煤灰及地下水中六价铬监测工作。

To study the content of chromium （Ⅵ） in coal ash of Huainan coal field, the samples of coal ash were digested using microwave alkaline digestion method, and the content of chromium （Ⅵ） was determined using Inductively Coupled Plasma Optical Emission Spectrometer （ICP-OES）. The results showed that the average content of chromium（Ⅵ） of Huainan coal field was 0. 77 mg/kg and the results were 0. 70 -0. 89 mg/kg. Generally, the content of chromium（Ⅵ） ot different coal mines were relatively consistent and had little differences. The content of chromium （Ⅵ） was not safe, the chromium（Ⅵ） in coal ash and underground water should be detected when power plants released coal fly ash.