Applicability of Magnesium Oxide as a Neutralizing Agent in Mine Water Disposal.
Applicability of Magnesium Oxide as a Neutralizing Agent in Mine Water Disposal.
复制标题
氧化镁作为中和剂在矿井水处理中的适用性。
DOI：
10.2473/shigentosozai.114.553
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
I. Matsuoka
中科院分区：
文献类型：
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作者：
A. Bekin;I. Matsuoka
以含铁量为1000 mg dm-3的人工矿井水为研究对象，考察了氧化镁作为中和剂在矿井水处理中的适用性。在氧化镁存在的情况下，亚铁离子比在石灰石存在的情况下更有效地被氧化为铁离子。溶液的曝气减少了氧化镁的用量和将铁浓度降低到可接受值所需的反应时间。此外，污泥的循环利用还显示出减少试剂用量、缩短反应时间和污泥致密化的效果。无曝气和有曝气的污泥循环工艺，在溶液中分别加入1.25等量的氧化镁和1.5等量的硫酸，形成固体浓度为0.155和0.373 g cm-3的污泥。在这两个过程中，反应时间都是30分钟。
Applicability of magnesium oxide as a neutralizing agent in mine water disposal has been investigated using an artificial mine water containing ferrous iron of 1,000 mg dm-3 in terms of the reagent dosage and the reaction time. Ferrous ions were more effectively oxidized to ferric ions by aeration of the solution in the presence of magnesium oxide than by that in the presence of limestone. Aeration of the solution decreased the magnesium oxide dosage and the reaction time required for lowering the iron concentration to the acceptable value. Furthermore, recycling of the sludge showed the effects of reduction of the reagent dosage, shortening of the reaction time and densification of the sludge. Sludge recycle processes without and with aeration formed a sludge with the solid concentration of 0.155 and 0.373 g cm-3 by the addition of magnesium oxide of 1.25 and 1.5 equivalents for ferrous iron and sulfuric acid in the solution, respectively. In both processes, the reaction times were 30 minutes.