摘要
煤系黄铁矿的有效抑制是煤泥浮选脱硫的关键。通过浮选试验和矿物表面分析技术研究过氧化氢(H_(2)O_(2))和氧化钙(CaO)对煤系黄铁矿的抑制效果强化及作用机理。研究结果表明:单独使用H_(2)O_(2)或CaO时,在最佳用量条件下,煤系黄铁矿上浮率分别为15.15%和15.45%,当同时加入CaO(2kg/t)及H_(2)O_(2)(60kg/t)时,煤系黄铁矿上浮率最低为8.97%,说明H_(2)O_(2)能强化CaO对黄铁矿的抑制作用。CaO与黄铁矿作用可产生少量含钙物质(主要是硫酸盐)覆盖于黄铁矿表面,一定程度上降低了黄铁矿的表面疏水性。H_(2)O_(2)与CaO共同作用条件下,黄铁矿表面氧化还原反应加剧,促进表面Fe—S键断裂和Fe、S离子的溶出,以及含Fe氧化产物Fe_(2)(SO_(4))_(3),Fe(OH)_(3),Fe_(2)O_(3)和含Ca氧化产物CaSO_(4),Ca(OH)2的生成和覆盖,强化对煤系黄铁矿的抑制作用。
Effective inhibition of coal-pyrite is the key to the flotation desulfurization of coal slime.The inhibition effect enhancement and mechanism of hydrogen peroxide(H_(2)O_(2))and calcium oxide(CaO)on coal-pyrite were studied by flotation test and mineral surface analysis technology.The research results show that When H_(2)O_(2)or CaO is used alone,the floating rate of coal-pyrite is 15.15%and 15.45%respectively under the optimal dosage of H_(2)O_(2)or CaO.When 2kg/t of CaO and 60kg/t of H_(2)O_(2)were added at the same time,the floating rate of coal-pyrite was at least 8.97%,which indicates that H_(2)O_(2)can strengthen the inhibition of CaO on pyrite.The interaction of CaO with pyrite can produce a small amount of calcium-containing substances(mainly sulfate)covering the surface of pyrite,which reduces the hydrophobicity of the surface of pyrite to a certain extent.Under the combined action of H_(2)O_(2)and CaO,the redox reaction on the surface of pyrite intensifies.It promotes the breaking of Fe-S bonds on the surface and the dissolution of Fe and S ions,as well as the formation and coverage of Fe-containing oxidation products(Fe_(2)(SO_(4))_(3),Fe(OH)_(3),Fe_(2)O_(3))and Ca-containing oxidation products(CaSO_(4),Ca(OH)2),which ultimately strengthen the inhibition of coal-pyrite.
作者
赖祥平
程伟
梁云帆
LAI Xiangping;CHENG Wei;LIANG Yunfan(Mining College of Guizhou University,Guiyang,Guizhou 550025,China;National&Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas,Guiyang,Guizhou 550025,China;Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources,Guiyang,Guizhou 550025,China)
出处
《矿业研究与开发》
CAS
北大核心
2022年第11期54-61,共8页
Mining Research and Development
基金
国家自然科学基金项目(51964009)
贵州省研究生科研基金项目(YJSCXJH〔2020〕061).
关键词
煤系黄铁矿
浮选
抑制剂
过氧化氢
氧化钙
Coal-pyrite
Flotation
Inhibitor
Hydrogen peroxide
Calcium Oxide
