废铅膏在柠檬酸钠水溶液中脱硫行为研究

Study on desulphurization processes of spent lead paste in sodium citrate aqueous solution

废铅膏中Pb SO_4所占的质量分数大于80%,柠檬酸钠可以使废铅膏有效脱硫,研究其在柠檬酸钠水溶液中的脱硫行为对废铅膏的回收再利用具有重要作用。本文通过正交试验以及极差分析研究废铅膏在柠檬酸钠水溶液中的脱硫行为。室温下,废铅膏在ω(柠檬酸钠)=8.3%的柠檬酸钠水溶液中的脱硫率仅为3.275%。通过极差分析可以判断脱硫温度、脱硫时间及溶液中柠檬酸钠所占质量分数对脱硫效果影响的大小。影响最大的因素为溶液中柠檬酸钠所占质量分数,其次是脱硫时间,影响最小的因素为脱硫温度。

The mass fraction of lead sulfate （PbSO4） contained in the spent lead paste is more than 80 % （81.4 wt %）. It is of great importance to research the desulphurization processes of spent lead paste in sodium citrate aqueous solution in order to recycle the scrap lead paste. These processes have been studied by orthogonal experiment and range analysis. At room temperature, desulphurization rate is just 3.275 % in 8.3 wt % sodium citrate aqueous solution. The effects of desulphurization temperature, desulphurization time and concentration of sodium citrate aqueous solution have been researched by range analysis method. The main influence factor is concentration of sodium citrate aqueous solution, the secondary factor is desulphurization time and the minimum factor is desulphurization temperature.