摘要
辉钼矿浮选矿浆中含有的大量钙离子,可能与SO_(4)^(2-)、MoO_(4)^(2-)、CO_(3)^(2-)、OH^(-)等生成沉淀吸附在辉钼矿表面,不同程度抑制辉钼矿的浮选。溶液化学计算结果表明,矿浆中CaSO_(4)/CaMoO_(4)/CaCO_(3)/Ca(OH)_(2)/出现点分别为pH=1.8/3.8/6.6/13.6,且存在不同程度的相互转化行为。单矿物浮选实验结果显示CaSO_(4)、CaMoO_(4)对辉钼矿浮选的抑制作用较小,而CaCO_(3)、Ca(OH)_(2)的抑制作用较大,其中CaMoO_(4)影响最小,Ca(OH)_(2)影响最大。接触角测试发现,去离子水/CaMoO_(4)溶液/CaSO_(4)溶液/CaCO_(3)溶液/Ca(OH)_(2)溶液中辉钼矿“棱”上接触角分别为89.25°/80.44°/73.31°/62.56°/53.13°,与不同钙离子沉淀对辉钼矿浮选效果影响的规律一致。SEM-EDS结果发现,仅有微量CaMoO_(4)吸附于辉钼矿“棱”,少量CaSO_(4)吸附于辉钼矿“面”,而CaCO_(3)大量吸附于辉钼矿“面”和“棱”。不同钙离子沉淀物在辉钼矿表面吸附行为的差异是导致辉钼矿浮选效果不同的原因,因此,调控辉钼矿浮选矿浆中钙离子沉淀物的类型有利于改善选钼效果。
Molybdenum flotation pulps containing a large amount of Ca^(2+),which may precipitate on the surface of Molybdenum with such as SO_(4)^(2-),MoO_(4)^(2-),CO_(3)^(2-),OH^(-),etc.,thereby inhibiting the flotation of Molybdenum to varying degrees.The results of solution chemistry calculations indicated that the occurrence points of CaSO_(4)/CaMoO_(4)/CaCO_(3)/Ca(OH)_(2)/in the slurry were pH=1.8/3.8/6.6/13.6,and there were varying degrees of mutual transformation behaviors.The single mineral flotation test results showed that CaSO_(4)and CaMoO_(4)had a relatively small inhibitory effec on the flotation of Molybdenum,while CaCO_(3)and Ca(OH)_(2)had a greater inhibitory effect,with CaMoO_(4)having the smallest impact and Ca(OH)_(2)having the most adverse effect.The contact angle test results showed that the contact angles on the edges of Molybdenum in deionized water/CaMoO_(4)solution/CaSO_(4)solution/CaCO_(3)solution/Ca(OH)_(2)solution were89.25°/80.44°/73.31°/62.56°/53.13°,which was consistent with the influence of different calcium ion precipitation on the flotation efficiency of Molybdenum.The SEM-EDS results showed that only minimal amount of CaMoO_(4)and a smal amount of CaSO_(4)adsorbed on the edges of Molybdenum,but a large amount of CaCO_(3)was adsorbed on the faces and edges of Molybdenum.This indicated that the difference in adsorption behavior of different calcium ion precipitates on the surface of Molybdenum might be the reason for the different flotation effects of Molybdenum.Therefore,regulating the type of calcium ion precipitate in the flotation slurry of Molybdenum is beneficial for improving the molybdenum selection effect.
作者
宛鹤
张乾康
薛季玮
宋学文
王森
张崇辉
卜显忠
WAN He;ZHANG Qiankang;XUE Jiwei;SONG Xuewen;WANG Sen;ZHANG Chonghui;BU Xianzhong(School of Resources Engineering,Xi’an University of Architecture and Technology,Xi’an 710000,Shaanxi,China)
出处
《矿产保护与利用》
2024年第2期67-73,共7页
Conservation and Utilization of Mineral Resources
基金
国家自然科学基金面上项目(52274271)
陕西省自然科学基础研究计划项目(2022JM-284)。
关键词
辉钼矿
浮选
钙离子沉淀
溶液化学
molybdenum
flotation
calcium ion precipitation
solution chemistry
