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通过对铝系钒铁炉渣碳酸钠焙烧-水浸全过程的矿物分析、热力学计算及对比实验,研究了炉渣中钒、铝同步转化、溶出的机理与规律.结果显示,焙烧进程中渣中镁铝尖晶石MgO·Al2O3相、CaO2Al2O3相逐渐消失,MgO相生成,并生成碱熔相Na2O·Al2O3和钒酸盐.随焙烧温度及时间增加,Na2O·Al2O3和钒酸盐相明显增多,钒、铝溶出率增加.焙烧熟料经水浸后,液相呈碱性,钒、铝分别以可溶性钒酸钠和铝酸钠的形式进入水相,固相残留物为少量未反应的镁铝尖晶石及新生成的MgO和Ca(OH)2.在磨矿粒度<75 μm、配碱系数1.0、焙烧温度1000℃及焙烧时间4h的优化条件下,钒的溶出率可达90%,铝的溶出率可达75%.
Through the mineral analysis, thermodynamic calculation and comparative experiment on the whole process of roasting and water immersion of vanadium-iron slag for aluminum-based ferro-slag, the mechanism and rule of simultaneous transformation and dissolution of vanadium and aluminum in slag were studied.The results showed that during the roasting process, Al 2 O 3 phase and CaO 2 Al 2 O 3 phase of aluminum spinel gradually vanished and MgO phase formed and formed alkali melting phase of Na 2 O · Al 2 O 3 and vanadate.The Na 2 O.Al 2 O 3 and vanadate phases increased obviously with the increase of calcination temperature and time, , And the dissolution rate of aluminum increased.After the roasted clinker was immersed in water, the liquid phase was alkaline, vanadium and aluminum were respectively dissolved in the aqueous phase in the form of soluble sodium vanadate and sodium aluminate, and the solid phase residue was a small amount of unreacted magnesia Spinel and the newly formed MgO and Ca (OH) 2 vanadium dissolution rate of up to 90% under the optimized conditions of grinding particle size <75 μm, base coefficient 1.0, calcining temperature 1000 ℃ and calcining time 4h, Aluminum dissolution rate of up to 75%.