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首页> 外文期刊>Journal of environmental science and health, Part A. Toxic/hazardous substances & environmental engineering >The use of zeolite-based additives for immobilising iron during pressure filtration of coal refuse slurry
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The use of zeolite-based additives for immobilising iron during pressure filtration of coal refuse slurry

机译：煤渣浆压力过滤过程中使用沸石基添加剂固定铁

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摘要

Pressure filtration of coal refuse slurry has the potential to provide a concentrated solids stream that can be stacked, thereby offering multiple environmental benefits. However, potential leachates from the solids stream can impact the environment. In that context, this study performed preliminary investigations of the application of zeolite-based additives to adsorb metals leaching from coal refuse slurry at low pH. Additives were added to the coal refuse slurry, which was filtered using bench- and lab-scale pressure filtration units. Results indicated that the overall filtrate flux and cake moisture characteristics were not significantly affected by the addition of additives up to 20 (by weight of solids). It was shown that adsorption as high as 80 was achieved by using the additives to capture iron. It was concluded that the finer additive with less silicon content was more effective in capturing iron. The results showed that the thickener feed stream leached out less iron than the thickener underflow stream. The adsorption process was not significantly affected by slight variations in initial iron concentration in the solution. The use of lower pH water on the filter cakes treated with the additive showed minimal release of iron and manganese into the aqueous phase.
机译：煤渣浆的压力过滤有可能提供可堆叠的浓缩固体流，从而提供多种环境效益。然而，固体流中潜在的渗滤液会影响环境。在此背景下，本研究对沸石基添加剂在低pH值下吸附从煤渣浆中浸出的金属进行了初步研究。将添加剂添加到煤渣浆中，使用台式和实验室规模的压力过滤装置进行过滤。结果表明，添加高达20%（固体重量）的添加剂对滤液通量和滤饼水分特性没有显著影响。结果表明，通过使用添加剂捕获铁，吸附率高达80%。得出的结论是，硅含量越低的更细的添加剂在捕获铁方面更有效。结果表明：浓稠剂进料流比浓稠剂流出铁少;吸附过程不受溶液中初始铁浓度的微小变化的显著影响。在用添加剂处理的滤饼上使用较低pH值的水，显示铁和锰释放到水相中的极少。

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