电镀污泥水热利用技术研究

采用连续式水热设备处理电镀污泥并进行重金属的分离纯化,试验研究了水热条件对污泥破解效果的影响.结果表明:每100g污泥加入150mL20%的硫酸溶液,反应温度为250℃,压力为7MPa,反应时间为8min时,电镀污泥毒性降低至一般固体废弃物标准.重金属分离纯化工艺研究表明:硫化沉铜的沉铜剂加入量为理论量的1.25倍,pH=2.0,反应温度为80℃时,沉铜率达98.1%;萃取除锌的有机相浓度为30%,O/A=2,萃取平衡时间为4min时,锌的萃取率达到94%以上;0.50倍理论用量的碳酸钙可有效促进铬镍的富集,铬的回收率达到92%以上,镍的回收率达到88%以上.

Studies on technology of the electroplating sludge hydrothermal utilization

Continuous hydrothermal equipment was applied to dispose sludge and to separate heavy metals. Effect of the hydrothermal conditions parameters on sludge hydrothermal crack was investigated. It is shown by results that 100g electroplating sludge could be reduced to the general solid waste standards by adding 150mL 20% sulfuric acid under 250℃, 7MPa in 8 minutes. Studies of heavy metal separation and purification proved that 98.1% copper could be recovered by adding 1.25 times the theoretical amount of copper precipitator under pH 2.0, 80℃. More than 94% zinc could be extracted within 4 minutes equilibrium by 30% organic phase in the process of zinc extraction, O/A=2. Furthermore, 92% of chromium and 94% of nickel could be successfully recovered by the addition of 0.50 times the theoretical amount of calcium carbonate.