EFFECT OF MgO ADDITIVE ON PREVENTING LEAKAGE OF Cr(VI) FROM A FLY ASH

摘要：

The effect of oxide magnesium (MgO) additive on preventing and/or reducing the leakage of Cr(VI) from a fly ash (coal ash) has been investigated by batch contact and column percolation tests. The test results indicate that MgO additive has an obvious effect of reducing Cr(VI) to CR(III). For cases of adding 10 to 30％ of Ariake clay into the fly ash, the test results indicate that Cr(III) was absorbed by the clay mineral. Comparing the results of the batch contact test and the column percolation test indicates that the column percolation test results in higher initial Cr(VI) concentration in the liquid phase. The main reason considered is that the column test had less water in contact with the ash at the early stage of the test. Also, the results of the column percolation test using the samples with different curing time indicate that with a cement additive, curing the sample can reduce Cr(VI) concentration, but with MgO additive, there is no obvious effect of curing the sample.

关键词： fly ash hezagon chromium magnesium additive batch contact test column percolation test

作者: Jin-Chun CHAI Takanori HINO Nobuyuki NISHINO

作者单位: Department of Civil Engineering, Saga University, Japan Institute of Lowland Technology, Saga University, Japan Ube Material Industries Ltd., Japan

会议类型: 国际会议

会议名称: International Symposium on Geoenvironmental Engineering(国际环境岩土工程研讨会

会议地点: 杭州

会议语种:英文

页码: 126-131

在线出版日期: 2009-09-08（万方平台首次上网日期，不代表论文的发表时间）