采用醋酸有机酸分离法对油页岩灰渣中的金属元素进行转化分离,利用醋酸的高选择性和低污染性,将Ca、Mg、Na、K等金属元素转化为醋酸盐,实现高效分离.采用Tessier法和BCR法研究油页岩灰渣中金属元素的赋存状态,结果表明,油页岩灰渣中Ca、Mg、Na、K四种元素主要以可交换态、碳酸盐结合态和氧化物结合态等醋酸可提取态赋存,适于醋酸浸取分离法;而Fe元素的赋存状态不是醋酸可提取态,仅有少量以氧化物结合态赋存,不适于醋酸浸取分离法.研究了不同反应条件(反应时间、反应温度和醋酸浓度)对油页岩灰渣中金属元素醋酸浸出率的影响规律,优化反应条件可提高其醋酸浸出率,选择醋酸浓度为30％,醋酸浸取反应温度为30℃,反应时间为2.0h.
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