电化学沉积是一种制备高性能与高可靠Au-30%（原子分数）Sn共晶合金封装材料的较好方法。采用恒电流法从一种无氰Au-Sn电镀液中沉积得到Au-Sn共晶合金薄膜。通过电化学测试、合金薄膜成分与形貌分析以及多批次重现性实验，确定在-2.0 mA/cm~2电流密度下可以沉积出表面平整致密且Sn原子含量稳定在30%（原子分数）左右的Au-Sn共晶合金薄膜。Au-Sn共晶合金薄膜的沉积速率约为5.0μm/h。差热分析曲线（DSC）表明，Au-Sn共晶合金薄膜共晶点温度为277.4℃,与理论值相一致。另外，该无氰Au-Sn电镀液具有较好的储存寿命。研究结果可以为无氰共沉积Au-Sn共晶合金薄膜提供一定的参考和经验。

采用冷冻结晶工艺对钛白副产硫酸亚铁进行了提纯研究,重点考察了结晶母液循环时镁、锰杂质的累积情况以及它们的去除规律,同时对可能引入体系的钠杂质影响也进行了研究.通过多次结晶可以逐渐降低七水硫酸亚铁晶体中镁、锰杂质含量,但结晶母液的循环会导致体系内镁、锰杂质逐渐累积.利用结晶液与结晶体中镁、锰含量的关系曲线推断得到:当结晶液中镁含量低于298 mg/L时,七水硫酸亚铁晶体中镁质量分数将低于0.025％;当结晶液中锰含量高于761 mg/L时,七水硫酸亚铁晶体中锰质量分数将高于0.05％.另外,结晶法提纯硫酸亚铁时应避免向体系中引入钠离子,否则会导致七水硫酸亚铁晶体中钠杂质含量超标问题.该论文研究结果可以为利用结晶法提纯钛白副产硫酸亚铁提供一定的理论和技术指导.

某钨矿选矿过程中加入了大量硅酸钠和其他浮选药剂,造成了尾矿沉降缓慢,选矿废水黏度大,废水中TAs、CODcr等指标超标无法外排等问题,而且将此尾矿澄清水回用到选矿中,浮选指标严重恶化.针对此问题,本文对该钨矿选矿废水进行了脱稳除硅试验和除砷降CODCr试验,试验结果表明,“石灰沉淀-铁碳微电解-吸附材料吸附”工艺处理该钨矿选矿废水效果明显,处理后的废水后液中TAs与CODCr指标均可达到国家地表水Ⅱ类水质标准,将其返回选矿流程,选矿指标接近清水指标.

研究了采用水洗—焙烧—还原酸浸工艺从A药剂钴渣中高效回收钴等有价金属,考察了焙烧温度、浸出时间、浸出温度、硫酸浓度、还原剂用量等对有价金属浸出率的影响.结果表明:钴渣在液固体积质量比5/1、常温下搅拌水洗1 h,然后在500℃下焙烧2 h,最后在80℃下用质量浓度80 g/L硫酸、10 g/L亚硫酸钠浸出1 h,钴浸出率在90％ 以上,锌浸出率在96％ 以上,镉浸出率大于99％,浸出液中的有价金属可高效回收.

Leaching of copper by bacterial oxidation-sulfuric acid leaching from mixed copper ore has been studied.By flask leaching,agitation leaching and column leaching tests,the influence of iron,nitrogen,phosphorus concentration on biological activity were examined.The results showed that 66.0% copper was leached after 6 days in flask leaching test with a pulp density of 10%.The higher concentration of these nutritional elements,the faster they were consumed.When pH was low 2.0 and iron,nitrogen,phosphorus concentrations reduced to 100,200 and 5 mg/L,the bacteria remained high activity.The highest leaching rate of copper was 85.3% in agitation leaching tests.71.0% copper was leached after 23 weeks in column leaching process at the ore particle size was lower than 15 mm.Phosphorus was comsumed in leaching of ore,so it should be added.