用氧浓差电池测定冰铜转炉吹炼过程熔体的氧位

用稳定的ZrO_2固体电解质构成下列氧浓差电池: Pt,Cr,Cr_2O_3|ZrO_2(CaO)|Pt,Ar-O_2|ZrO_2(CaO)|冰铜,Pt Pt,Cr,Cr_2O_3|ZrO_2(CaO)|Pt,Ar-O_2|ZrO_2(CaO)|炉渣,Pt Pt,Cr,Cr_2O_3|ZrO_2(CaO)|Pt,Ar-O_2|ZrO_2(CaO)|粗铜,Pt 测定了转炉吹炼冰铜过程中冰铜、炉渣、白冰铜及粗铜试样的氧位。鼓风炉冰铜的平衡氧分压约为10~(-14)atm(1343k),在转炉吹炼过程造渣期中冰铜的平衡氧分压由10~(-11)atm渐次增长到10~(-9)atm,而炉渣的平衡氧分压总保持为10~(-11)atm数量级;在造铜期中白冰铜的平衡氧分压跃增到10~(-3)atm,最后粗铜的平衡氧分压提高到4.6×10~(-5)atm(1513k)。用热力学数据计算了粗铜中氧的活度及氧的浓度。     

A novel collector RL for flotation of bauxite

The flotation properties of single minerals such as diaspore, kaolinite and pyrophllite in bauxites were investigated using RL as collector. The effects of regulators and unavoidable ions on flotation were studied. Based on the results of single minerals flotation, the separation experiments of mixed minerals and bauxite ore were carried out. The results of closed circuit test on the ore show that, using RL as collector, Na2CO3 and (NaPO3)6 as modifiers, the grade of Al2O3 and SiO2 are respectively 70.74% and 6.37% in concentrate(Al/Si 11.11 ), and the recovery of Al2O3 can reach 90.52 %.     

采用纤蛇纹石制备纳米纤维状多孔氧化硅

以天然纤蛇纹石为原料，通过酸浸制备纳米纤维状多孔氧化硅，并使用X射线荧光光谱（XRF）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和N2吸附-脱附等温线技术等对其进行表征。研究结果表明：该多孔氧化硅具有独特的纳米纤维状形貌；其结构为无定形，结构组成单元仍为硅氧四面体，但四面体交替上下排列，六元环结构发生高度扭曲变形。纳米纤维状多孔氧化硅比表面积为391．8m^2／g，总孔容为1．05cm^3／g，由吸附-脱附等温线的滞后回线特征判断其结构中的孔主要为缝隙型孔。