Effect of carbonate minerals on quartz flotation behavior under conditions of reverse anionic flotation of iron ores
Effect of carbonate minerals on quartz flotation behavior under conditions of reverse anionic flotation of iron ores
复制标题
铁矿石反阴离子浮选条件下碳酸盐矿物对石英浮选行为的影响
DOI：
10.1016/j.minpro.2016.04.008
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发表时间：
2016-07-10
影响因子：
--
通讯作者：
Ma, Yingqiang
中科院分区：
文献类型：
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作者：
Luo, Ximei;Wang, Yunfan;Ma, Yingqiang
含碳酸盐铁矿石的反阴离子浮选是一个相当具有挑战性的过程。在许多实验室或选矿厂对这种矿石进行的研究表明，即使有价值的矿物被充分释放，精矿品位和石英与铁矿物之间的分离也很差。碳酸盐矿物如菱铁矿的存在对石英浮选回收（泡沫产物）和石英与铁矿物之间的分离选择性造成不利影响。以油酸钠为捕收剂，淀粉和钙为调整剂，研究了碳酸盐矿物对铁矿石中石英浮选的影响。采用微浮选、吸附、PHREEQC计算和傅里叶变换红外光谱（FTIR）测定等方法进行了研究。碳酸盐矿物（即，菱铁矿和白云石）对石英的可浮性和石英与赤铁矿之间的分离产生不利影响。淀粉用量实验结果清楚地表明，在碳酸盐矿物存在下，石英回收率的降低主要与淀粉有关。此外，矿物溶解和碳酸钠投加实验表明，碳酸盐矿物的CO 32溶解物种被动影响石英浮选回收率。相比之下，淀粉和CO 32溶解的碳酸盐矿物种类对浮选回收率产生不利影响。红外光谱表明，在碳酸盐矿物的存在下，石英回收率的强烈下降是由于吸附的碳酸钙沉淀在石英表面，并进一步与淀粉分子的相互作用。CaCO 3沉淀的出现是由于CaCl 2水解产生的Ca 2+与碳酸盐矿物的CO 32-溶解物种反应所致。为了减少消极影响，一个潜在的策略，以改善在强碱性pH值的铁矿石，含有碳酸盐矿物的浮选性能，建议在赤铁矿和石英之间的分离之前除去碳酸盐矿物。(C)© 2016 Elsevier B. V.版权所有。
Reverse anionic flotation of carbonate-containing iron ores is quite a challenging process. Studies on this ores conducted in many laboratories or beneficiation plants have obtained poor concentrate grades and separation between quartz and iron minerals, even when valuable minerals are adequately liberated. The presence of carbonate minerals, such as siderite, causes a detrimental effect on quartz flotation recovery (froth product) and separation selectivity between quartz and iron minerals. In this work, the effect of carbonate minerals on quartz flotation from iron mineral was investigated using sodium oleate as collector, starch and calcium as regulators. Microflotation, adsorption, PHREEQC calculation, and Fourier transform infrared spectroscopy (FTIR) measurements were conducted in the investigation. Carbonate minerals (i.e., siderite and dolomite) adversely affected the floatability of quartz and separation between quartz and hematite. Starch dosage experiment results clearly showed that the reduction of quartz recovery in the presence of carbonate minerals was mainly related to starch. In addition, mineral dissolution and sodium carbonate dosage experiments evidently exhibited that CO32- dissolved species of carbonate minerals passively affected quartz flotation recovery. By contrast, both starch and CO32- dissolved species of carbonate minerals adversely affected the flotation recovery. FTIR showed that the strong drop-off in quartz recovery in the presence of carbonate minerals was due to the adsorption of CaCO3 precipitations on quartz surfaces and further their interaction with starch molecules. The appearance of CaCO3 precipitations was caused by reaction of Ca2+ from the hydrolysis of CaCl2 and CO32- dissolved species of carbonate minerals. To decrease the passive effect, a potential strategy to improve the flotation performance of iron ores that contain carbonate minerals at strong alkaline pH is suggested to remove carbonate minerals before separation between hematite and quartz. (C) 2016 Elsevier B.V. All rights reserved.