Modes of occurrence and removal of toxic elements from high-uranium coals of Rongyang Mine by stepped release flotation
Modes of occurrence and removal of toxic elements from high-uranium coals of Rongyang Mine by stepped release flotation
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荣阳矿高铀煤中有毒元素的赋存模式及分级释放浮选脱除
DOI：
10.1002/ese3.384
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发表时间：
2019-10-01
影响因子：
3.8
通讯作者：
Zhang, Wei
中科院分区：
文献类型：
--
作者：
Duan, Piaopiao;Wang, Wenfeng;Zhang, Wei
贵州荣阳煤富集铀(U)和钒(V)、铬（Cr）、钼（Mo）、钴（Co）、铜（Cu）、硒（Se）等有毒元素。因此，有必要在燃烧前将这些有毒元素从高铀煤中去除。以往的研究表明，浮选和重选不能有效地去除U。本文对荣阳矿龙潭组煤进行了阶梯释放浮选和酸浸试验。这些分析的结果如下：(a)分级释放分析表明，多级净化过程有助于从净化后的煤中分离出有毒元素；(b)阶梯式释放和酸浸法对有毒元素的去除与其发生方式密切相关。钒、铬、钼、铀在有机质和细粒矿物中所占比例较大，采用阶梯释放浮选法难以去除；(c)与浮选相比，大多数元素最好采用阶梯释放浮选法去除。与重选相比，分级释放浮选对U的去除率更高，重选对亲硫元素的去除率大于浮选；(d)分级释放浮选后，Sc、V、Cu、Se、Mo、Hg、U等有毒元素仍富集于精煤中，说明分级释放浮选不能完全去除这些元素。
The Rongyang coals from Guizhou, southwestern China, are significantly enriched with uranium (U) and other toxic elements, such as vanadium (V), chromium (Cr), molybdenum (Mo), cobalt (Co), copper (Cu), and selenium (Se). Therefore, it is necessary to remove these toxic elements from high-U coals before combustion. Previous studies have shown that U cannot be effectively removed by flotation and gravity separation. In this study, the stepped release flotation and acid leaching tests were conducted for coals of the Longtan Formation from the Rongyang Mine. The results from these analyses are as follows: (a) Stepped release analyses revealed that a multistage cleaning process can help to separate toxic elements from cleaned coals; (b) The removal of toxic elements by stepped release and acid leaching is closely related to their mode of occurrence. Vanadium, Cr, Mo, and U were difficult to be removed by stepped release flotation, which due to a significant proportion of them occur in organic matter and fine-grained minerals; (c) Compared to flotation, most elements were better to be removed by stepped release flotation. In comparison with gravity separation, U had a higher removability by stepped release flotation, while the removal effect of thiophilic element by gravity separation was greater than by flotation; (d) After stepped release flotation, toxic elements Sc, V, Cu, Se, Mo, Hg, and U are still enriched in cleaned coals, suggesting that these elements cannot be fully removed through stepped release flotation.