流化床燃煤固硫渣火山灰活性评定的探讨

流化床燃煤固硫渣是一种特殊的、具有火山灰活性的燃煤副产品,由于其f-CaO和SO3含量较普通煤粉锅炉灰渣高,具有一定的自硬性和膨胀性,目前尚无统一的方法或标准准确评定其火山灰活性,影响了该燃煤副产品的建材资源化利用。根据流化床燃煤固硫渣火山灰活性来源及其特点,参照《用于水泥中的火山灰质混合材料》GB2847和《用于水泥混合材料的工业废渣活性试验方法》GB12957-91,提出采用“水泥熟料胶砂28天抗压强度比”来评定流化床燃煤固流渣的火山灰活性。试验研究表明该方法测定的火山灰活性与其自硬性强度和活性率具有较好的一致性。

Study on Evaluating the Pozzolanicity of CFB Sulphur- Fixed Coal Ashes

There is no appropriate method or uniform standard for evaluating the pozzolanicity of CFB sulphur-fixed coal ashes,leading to difficulty in use of it as building material,because CFB sulphur-fixed coal ash has higher content of f-CaO and SO_3 than that of ordinary ash.In this paper the appropriate evaluating methods are developed through theoretical analysis and experiments with reference to the National standards GB2847 for the pozzolanic materials and GB12957-91for the testing method of the activity of the industrial wastes,the compressive strength ratio is suggested by determination of 28 day compressive strength ratio of ground CFB sulphur-fixed coal ashes-clinker to ground clinker.It is shown that this evaluating method gives the results consistent with those from other methods.