利用拜耳法赤泥和氟化钙污泥制备烧结砖块
发布时间：2018-08-02 09:38
【摘要】：拜耳法赤泥是用氢氧化钠溶解铝土矿生产氧化铝过程中产生的固体废弃物。针对拜耳法赤泥的强碱性、重金属含量高等特点,提出了一种利用酸性氟化钙污泥进行共同烧制砖块的方法。以砖块的氟离子浸出量、铬离子浸出量、抗压强度、砖块密度及烧失量5个变量为评价指标,利用主成分分析法对五个指标进行综合评分,并研究了以氟化钙污泥与赤泥比,黏土添加量、铝灰添加量、黏结剂添加量、烧结温度为自变量对综合评分的影响。利用响应面法(RSM)对实验数据进行分析,得出最佳实验条件依次为氟化钙污泥与赤泥比=61.1%,黏土添加量=21.4%,铝灰添加量=15%,黏结剂添加量=2.5%,烧结温度=1 000℃。此条件下所得砖块对应的氟离子浸出量为0.33 mg·L~(-1),铬离子浸出0.034 mg·L~(-1),抗压强度5.73 MPa,烧失量9%,砖块密度1.07 g·cm~(-3)。可用做非承重砖。
[Abstract]:Bayer red mud is a solid waste produced in alumina production by dissolving bauxite with sodium hydroxide. In view of the strong alkalinity and high heavy metal content of red mud in Bayer process, a method of making bricks by using acidic calcium fluoride sludge was put forward. With the five variables of fluorine ion leaching, chromium ion leaching, compressive strength, brick density and burning loss as evaluation indexes, the five indexes were comprehensively graded by principal component analysis (PCA), and the ratio of calcium fluoride sludge to red mud was studied. The effects of clay addition, aluminum ash addition, binder addition and sintering temperature on the comprehensive score were investigated. The experimental data were analyzed by response surface method (RSM). The results showed that the optimum experimental conditions were as follows: ratio of calcium fluoride sludge to red mud 61.1, clay content 21.4g, aluminum ash 15, binder 2.5, sintering temperature 1 000 鈩，
本文编号：2159019
[Abstract]:Bayer red mud is a solid waste produced in alumina production by dissolving bauxite with sodium hydroxide. In view of the strong alkalinity and high heavy metal content of red mud in Bayer process, a method of making bricks by using acidic calcium fluoride sludge was put forward. With the five variables of fluorine ion leaching, chromium ion leaching, compressive strength, brick density and burning loss as evaluation indexes, the five indexes were comprehensively graded by principal component analysis (PCA), and the ratio of calcium fluoride sludge to red mud was studied. The effects of clay addition, aluminum ash addition, binder addition and sintering temperature on the comprehensive score were investigated. The experimental data were analyzed by response surface method (RSM). The results showed that the optimum experimental conditions were as follows: ratio of calcium fluoride sludge to red mud 61.1, clay content 21.4g, aluminum ash 15, binder 2.5, sintering temperature 1 000 鈩，
本文编号：2159019
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