School of Environmental Science and Engineering, Shanghai JiaoTong University, Shanghai 200240, China.
Chemosphere. 2009 Nov;77(8):1143-5. doi: 10.1016/j.chemosphere.2009.08.023. Epub 2009 Sep 17.
Chromite Ore Processing Residue (COPR) is the byproduct of chromate production process, which contains a large amounts of Cr(VI). The present work developed a new technique to treat COPR, and the process involved mixing the COPR with rice straw followed by pyrolysis. It was found that the gaseous organic fraction generated during pyrolysis of straw was beneficial to Cr(VI) reduction. In the study, process variables, such as the amount of straw added to COPR, heating temperature and particle size, were systematically varied, and their influences on the Cr(VI) reduction in COPR were all investigated. After pyrolysis, Cr(VI) decreased greatly, from 3400 for untreated COPR to less than 30 mg kg(-1) for treated COPR at 600 degrees C.
铬铁矿加工残渣（COPR）是铬酸盐生产过程的副产品，其中含有大量的六价铬（Cr(VI)）。本研究开发了一种新的 COPR 处理技术，该工艺涉及将 COPR 与稻草混合，然后进行热解。研究发现，稻草热解过程中产生的气态有机组分有利于 Cr(VI)的还原。在研究中，系统地改变了工艺变量，如添加到 COPR 中的稻草量、加热温度和粒度，研究了它们对 COPR 中 Cr(VI)还原的影响。热解后，Cr(VI)大大降低，未处理的 COPR 中 Cr(VI)的含量从 3400 降至 600°C 时处理后的 COPR 中低于 30mgkg(-1)。
