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采用乙酸-乙酸钠溶液浸出卡尔多炉渣中的铅,用无水亚硫酸钠沉淀分离浸出液中的铅,沉铅滤液脱硫(加氢氧化钡)后返回浸出工序,研究了相关工艺参数对铝直收率及亚硫酸铅纯度的影响。结果表明:在搅拌速度为300 r/min,浸出温度为室温(25℃),乙酸、乙酸钠浓度分别为1 mol/L和2 mol/L,液固比5∶1,浸出时间2 h时,铅的浸出率可达到99.1%,浸出液含铅78.3 g/L;在搅拌速度200 r/min,沉淀温度为室温(25℃),无水亚硫酸钠过量系数1.25,沉淀时间20 min时,沉铅滤液余铅含量可降至4×10-6,亚硫酸铅纯度达到97.4%,铅的直收率可达到98%以上;沉铅滤液除硫酸根后,补充乙酸、乙酸钠至摩尔浓度分别为1 mol/L和2 mol/L,返回浸出工序,按浸出的最优条件处理同样的卡尔多炉渣,铅的浸出率可以达到98.1%,实现了浸出剂的闭路循环。
The lead in Kaldor slag was leached with acetic acid-sodium acetate solution, the lead in the leachate was precipitated by anhydrous sodium sulfite, and the lead plumbum filtrate was desulphurized (with barium hydroxide) and then returned to the leaching process. The effects of relevant process parameters on the direct aluminum yield And lead sulfite purity. The results showed that when the stirring speed was 300 r / min, the leaching temperature was 25 ℃, the concentration of acetic acid and sodium acetate was 1 mol / L and 2 mol / L, the ratio of liquid to solid was 5:1 and the leaching time was 2 h , Leaching rate of lead up to 99.1% and leaching solution lead up to 78.3 g / L. Under the conditions of stirring speed of 200 r / min, precipitation temperature of 25 ℃, excess Na2S2.25 and precipitation time of 20 min, The lead content in the filtrate can be reduced to 4 × 10-6, the purity of lead sulfite reaches 97.4%, and the direct yield of lead can reach above 98%. After the lead sulfate filtrate is removed, the acetic acid and sodium acetate are added to the molar concentrations of 1 mol / L and 2 mol / L, respectively, and returned to the leaching step. The same Kaldor slag was treated according to the optimal leaching conditions. The leaching rate of lead reached 98.1%.