机械消泡在糊树脂生产中的应用

通过使用聚氯乙烯糊树脂机械消泡装置,在出料回收系统中使用消泡机、脱泡塔,无需消泡剂,同样可以解决回收系统中的泡沫问题,降低了运行成本,提高了产品质量。

Comparative studies on hydrometallurgical treatment of smelted low-grade electronic scraps for selective copper recovery

A comparison of three hydrometallurgical methods for selective recovery of copper from low-grade electric and electronic wastes was reported. Scraps were smelted to produce Cu？Zn？Sn？Ag alloy. Multiphase material was analyzed by SEM？EDS and XRD. The alloy was dissolved anodically with simultaneous metal electrodeposition using ammoniacal and sulfuric acid solutions or leached in ammonia？ammonium sulfate solution and then copper electrowinning was carried out. This resulted in the separation of metals, where lead, silver and tin accumulated mainly in the slimes, while copper was transferred to the electrolyte and then recovered on the cathode. The best conditions of the alloy treatment were obtained in the sulfuric acid, where the final product was metal of high purity （99% Cu） at the current efficiency of 90%. Ammoniacal leaching of the alloy led to the accumulation of copper ions in the electrolyte and further metal electrowinning, but the rate of the spontaneous dissolution was low. Anodic dissolution of the alloy in the ammonia？ammonium sulfate solution led to the unfavorable distribution of metals among the slime, electrolyte and cathodic deposit.

大中型沼气工程余热回收系统及模拟分析

根据对大中型沼气工程中温发酵系统的研究,依照哈尔滨等地区气象条件计算总耗热量,在此基础上为减少沼气罐出料的热量损失,设计了一套污水源热泵余热回收系统。应用Dymola软件对该系统模型的余热回收效率进行模拟分析,评价了污水源热泵全年的工作状况。对哈尔滨地区,在周期为4 h的进出料循环中,污水源热泵系统的COP为2.7~3.0,过热度在3 K左右,热泵系统工作稳定,制热性能系数较高。对哈尔滨地区,11月至转年3月,辅助热源需一直开启;6—8月,压缩机部分负荷运行;4、5、9、10月,根据总耗热量与热泵制热量,确定辅助热源开启时间。在哈尔滨地区,采用压缩机功率为20 kW的热泵系统,最冷的1月能够补偿72%的总耗热量,但小时不保证率较高,需设置辅助热源;采用压缩机功率为33 kW的热泵系统,制热量与总耗热量大体持平,可基本满足中温发酵,但该热泵在6—8月提供的热量超过所需热量的两倍,且COP相比压缩机功率为20 kW时有所降低。