氰化尾渣制备微电解填料及降解甲基橙研究

以氰化尾渣为原料，采用煤基直接还原工艺制备铁碳微电解填料，并将填料用于处理甲基橙等模拟废水.研究了焙烧温度、焙烧时间、煤用量等制备条件对填料降解甲基橙的影响.结果表明，在焙烧温度为1250℃，焙烧时间为60min，煤用量为30%的条件下制备的微电解填料对甲基橙废水的脱色效果最好.提高填料用量和降低溶液初始pH值有利于去除甲基橙.用于处理400mL浓度为100mg/L的甲基橙溶液，在填料用量为2g，溶液初始pH值在3~6的范围内，当降解时间为30min时，甲基橙脱色率均接近100%.XRD分析表明，最佳条件下制备的填料中主要结晶物相为零价铁.SEM显示填料中的零价铁颗粒粒度均在50μm以下，零价铁与残碳构成微电解填料.

Synthesis of micro-electrolysis filter from cyanide tailings thorugh direct reduction process and its application for degradation of methyl orange

In the present study, cyanide tailings were used as raw materials for preparing of iron-carbon micro-electrolytic fillers through coal-based direct reduction process. The fillers were used to treat methyl orange solution. The effects of calcination temperature, calcining time and coal dosage on the degradation of methyl orange were studied. The results showed that the fillers presents the best performance for removing methyl orange, which prepared under the conditions of calcination temperature 1250℃, calcination time 60min and coal dosage 30%. Increasing the amount of filler and reducing the initial pH of the solution facilitates the removal of methyl orange. For the treatment of 400mL methyl orange solution with a concentration of 100mg/L, the removal rate of methyl orange was close to 100% with 2.0g filler under acidic conditions when the treatment time was 30min. XRD analysis showed that the main crystalline phase in the filler prepared under optimal conditions was zero-valent iron. SEM analysis showed that the sizes of the zero-valent iron particles in the filler were all below 50μm, and the zero-valent iron and residual carbon constituted the micro-electrolytic filler.