阜康镍冶炼厂含镍铜渣冶炼工艺研究

采用焙烧—浸出—电积工艺处理阜康镍冶炼厂含镍铜渣。在焙烧温度 80 0～90 0℃、浸出温度 6 5～ 70℃、浸出时间 12 0min的条件下 ,可得到铜浸出率为 97%。由于浸出液含铁极低、含镍低于 1g/L ,不需净化可直接电积。工业生产中可抽取一定量的铜电积老液送镍冶炼系统 ,防止铁、镍累积。含镍铜渣中的贵金属全部进入浸出渣 ,浸出渣率很低有利于贵金属富集。该工艺流程结构简单 ,金属回收率高 ,含镍铜渣中有价金属可综合回收 ,无环境污染     

低品位铌矿硫酸焙烧——草酸浸出回收铌的研究

开展了对低品位铌精矿进行硫酸焙烧及草酸浸出研究，考察了不同因素对铌富集效果的影响。结果表明，在硫酸焙烧阶段，在矿物粒径为-150 200目、焙烧温度为200℃和硫酸浓度为80%的条件下，焙烧40min，可使铌精矿中97%以上的铌和90%以上的钙留在渣相，93%以上的铁、锰及钠进入液相；在草酸浸出阶段，在草酸浓度为85%及浸出温度为80℃的条件下，含铌滤渣浸出60min，可使铌浸出率达到98%以上，钙浸出率低于0.6%。     

Supercritical fluid extraction as a potential mitigation strategy for the reduction of acrylamide level in coffee

The removal of acrylamide from coffee through supercritical CO₂ extraction has been investigated for the first time. Two steps were performed: a pre-roasting treatment and a supercritical extraction process. The main aim of this first work was to investigate the feasibility of the process more than the impact of the treatment on the organoleptic properties of coffee. The efficiency of acrylamide removal was checked by measuring its content in the coffee beans before and after the supercritical treatment. The role of temperature, pressure, extraction time and the addition of a modifier (ethanol) was examined.