Hazardous jarosite use in developing non-hazardous product for engineering application
Hazardous jarosite use in developing non-hazardous product for engineering application
复制标题
DOI：
10.1016/j.jhazmat.2006.04.054
复制
发表时间：
2006-10-11
影响因子：
13.6
通讯作者：
Asolekar, Shyam R.
中科院分区：
文献类型：
--
作者：
Asokan, Pappu;Saxena, Mohini;Asolekar, Shyam R.
金属锌提取过程中释放的黄钾铁矾是一种有害物质，其处置已成为世界范围内的一个主要环境问题。在这项研究中，已尝试固定和回收的黄钾铁矾释放印度，印度，使用CCR，所谓的粉煤灰，和粘土。结果表明，黄钾铁矾的颗粒尺寸比CCR的颗粒尺寸更细，并且由于细结构材料导致高表面积（10，496.18 +/- 30.90 cm（2）/g）而具有更高的孔隙率和持水量。黄钾铁矾中铅、锌、硫、镉、铬、铜等有毒元素的含量高于CCR。黄钾铁矾中Ra-226、K-40和Ac-228等放射性核素的浓度低于CCR中的浓度，与土壤相似。对固化/稳定（s/s）烧结黄钾铁矾-CCR产品的统计设计实验证实，黄钾铁矾砖的抗压强度高达140 kg/cm（2），吸水率为14.5%，黄钾铁矾与粘土的比例分别为3：1，但美国环境保护署（USEPA）-毒性渗滤液特性程序（TCLP）标准推荐的所有有毒元素的浓度均不在允许范围内。然而，它被证实，使用2：1的黄钾铁矾粘土比例与15%的CCR开发的S/S-烧结产品的有毒元素浸出潜力符合USEPA-TCLP的限制，也满足工程应用的质量。(c)2006 Elsevier B. V.保留所有权利。
Jarosite released from zinc metal extraction process is hazardous in nature and its world wide disposal has become a major environmental concern. In this study, an attempt has been made to immobilise and recycle the jarosite released from Hindustan Zinc Limited, India, using CCRs, so called fly ash, and clay soil. Results revealed that the particle size of jarosite was finer than that of CCRs and had higher porosity and water holding capacity due to fine textured materials resulting in high surface area (10,496.18 +/- 30.90 cm(2)/g). Jarosite contain higher concentration of toxic elements (lead, zinc, sulphur, cadmium, chromium and copper) than that of CCRs. Concentrations of radionuclides such as Ra-226, K-40 and Ac-228 in jarosite found less than in CCRs are similar to that of soil. Statistically designed experiments on solidified/stabilised (s/s) sintered jarosite-CCRs products confirmed that the compressive strength of jarosite bricks reached as high as 140kg/cm(2) with 14.5% water absorption capacity at the combination of 3:1 ratio of jarosite and clay, respectively, but, concentrations of all the toxic elements recommended by United States Environmental Protection Agency (USEPA)-Toxicity Leachate Characteristics Procedure (TCLP) standard are not within the permissible limits. However, it is confirmed that the toxic elements leaching potentials of s/s-sintered products developed using 2:1 jarosite clay ratio with 15% CCRs comply with the USEPA-TCLP limits and also meet the quality for engineering applications. (c) 2006 Elsevier B.V. All rights reserved.