新型捕收剂DTA-2在高铝铁矿石提铁降铝反浮选中的应用
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摘要
针对现阶段高铝铁矿石选别后铁精矿中含铝过高的问题,东北大学研制了一种新型、高效的两性螯合捕收剂DTA-2,以某悬浮焙烧后磁选铁精矿为研究对象,进行提铁降铝反浮选试验。结果表明:在常温,自然pH条件下,以DTA-2为捕收剂,淀粉为抑制剂,经1粗1精1扫反浮选流程试验,可以获得精矿TFe品位66.80%、Al2O3品位3.26%的指标。对浮选精矿产品进行分析发现:褐铁矿内部结构相对松散,其中包裹脉石矿物较多;粒度较大氧化铁颗粒周围黏连微粒(多小于1μm)以氧化铝为主的脉石矿物,微细粒的铁氧化物和以氧化铝为主的脉石矿物集合成磁性聚合体,造成精矿含杂;粒度较粗的氧化铝矿物颗粒内部有微粒(小于1μm)弥散状氧化铁颗粒,磁选精矿中石英、高岭石、云母、长石矿物与氧化铁矿物连生或微粒单体夹带进入浮选精矿造成精矿杂质含量较高。通过浮选的方法解决了悬浮焙烧后磁选铁精矿含铝过高的实际问题。试验结果对高铝铁矿石的提铁降铝研究具有借鉴意义。
In view of the problem of high aluminum content in iron concentrate after high alumina iron ore separation at the present stage,Northeastern University has developed a new efficient amphiphilic chelation collector DTA-2,iron increase and aluminum decrease reverse flotation test was conducted using a magnetic separation concentrate after suspension roasting as research object. The results showed that at room temperature,natural pH,with DTA-2 as the collector and starch as the in?hibitor,via one roughing one cleaning one scavenging reverse flotation process high-quality flotation product with TFe grade is 66.80% and Al2 O3 grade is 3.26% can be obtained. It was found that,the internal structure of limonite is relatively loose,and there are many gangue minerals;around larger the iron oxide particles there are many alumina-based gangue minerals(larger than 1 μm),fine-grained iron oxides and alumina-based gangue minerals are aggregated into magnetic aggregates,re?sulting in many impurity occur in concentrate;the coarse-grained alumina mineral particles of the concentrate have fine parti?cles(less than 1 μm)dispersed iron oxide particles,and quartz,kaolinite,mica,feldspar minerals and iron oxide minerals entering the magnetic separation concentrate ore entrainment of particulate monomers into the concentrate results in higher levels of concentrate impurities. The practical problem of high aluminum content in magnetic iron concentrate after suspension roasting is solved by flotation method. The test results have reference significance for the study of iron and aluminum reduction of high alumina iron ore.
In view of the problem of high aluminum content in iron concentrate after high alumina iron ore separation at the present stage,Northeastern University has developed a new efficient amphiphilic chelation collector DTA-2,iron increase and aluminum decrease reverse flotation test was conducted using a magnetic separation concentrate after suspension roasting as research object. The results showed that at room temperature,natural pH,with DTA-2 as the collector and starch as the in?hibitor,via one roughing one cleaning one scavenging reverse flotation process high-quality flotation product with TFe grade is 66.80% and Al2 O3 grade is 3.26% can be obtained. It was found that,the internal structure of limonite is relatively loose,and there are many gangue minerals;around larger the iron oxide particles there are many alumina-based gangue minerals(larger than 1 μm),fine-grained iron oxides and alumina-based gangue minerals are aggregated into magnetic aggregates,re?sulting in many impurity occur in concentrate;the coarse-grained alumina mineral particles of the concentrate have fine parti?cles(less than 1 μm)dispersed iron oxide particles,and quartz,kaolinite,mica,feldspar minerals and iron oxide minerals entering the magnetic separation concentrate ore entrainment of particulate monomers into the concentrate results in higher levels of concentrate impurities. The practical problem of high aluminum content in magnetic iron concentrate after suspension roasting is solved by flotation method. The test results have reference significance for the study of iron and aluminum reduction of high alumina iron ore.
引文
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