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为缓解磷矿废石中磷元素流失对生态环境造成的危害,以湖北省宜昌市兴山县树空坪磷矿区磷矿废石为研究对象,基于EPA M1315试验规范,开展不同水泥含量条件下磷矿废石固化体抗剪强度试验及固磷效果试验.结果表明:粘聚力与水泥质量分数之间呈较好的线性相关性,随着水泥质量分数的增加,试样的抗剪强度增大;A1试样浸滤液的p H值最大,为10.23,F6试样浸滤液和H8试样浸滤液的p H值最小,为8.41,最接近中性,对土壤和河流的酸碱危害性最小;H8试样浸滤液的总磷浓度累计释放量最大,为5.09 mg/L,F6试样浸滤液的总磷浓度累计释放量最小,为2.31 mg/L.因此,F6试样的固磷效果最好,即磷矿废石固化材料的最优配比为水泥质量分数50%(百分比针对磷矿废石质量而言)、粉煤灰质量分数10%、粘土质量分数40%.
In order to alleviate the harm to the environment caused by the loss of phosphorus in phosphate rock, aiming at the harm of phosphorus loss in phosphate rock waste rock, phosphate rock wastes from Shukongping phosphate rock area in Xingshan County, Yichang City, Hubei Province were used as research objects. Based on the EPA M1315 test code, Under the phosphate rock waste rock solidified body shear strength test and phosphorus fixation test results show that: cohesion and cement quality scores showed a good linear correlation between the cement content with the increase of shear resistance The maximum value of p H in sample A1 was 10.23, the value of p H in sample leachate of F6 sample and that of sample H8 was the lowest, 8.41, which was the closest to the neutral pH and the pH value of soil and river The total amount of total phosphorus released by the leachate of H8 was the largest, which was 5.09 mg / L, and the cumulative total phosphorus released by the leachate of F6 was the lowest, which was 2.31 mg / L. Therefore, The best phosphorus fixing effect is that the optimal proportion of phosphorite and waste rock solidified material is 50% of cement mass fraction (percentage is for phosphate rock waste rock), fly ash mass fraction is 10% and clay mass fraction is 40%.