SPW助剂应用于氰化浸金研究

为了实现矿产资源的综合利用 ,有效回收有价元素 (Au、Ag、Pb、S等 ) ,用SPW型协同氧化催化氰化浸出新助剂 ,对秦岭TL地区金矿石进行了实验室试验和扩大试验。其结果表明 ,在矿样粒度 - 32 0目大于 85 % ,NaCN用量为 7kg/t,矿浆浓度为 4 0 % ,SPW助剂用量≤ 5kg/t条件下 ,对含金品位为 (10 0± 2 0 )g/t的金精矿 ,浸出时间为 (10± 2 )h ,金的浸出率可达 98%以上。

试论混合钼精矿的冶炼方法

对铜钼混选矿,采用纯氧焙烧-真空升华的冶炼工艺,试剂投入低,产品档次高。对低钼铜钼混选矿和所有铅钼混选矿以及镍钼矿原矿,采用硫酸加硝酸常压强化催化氧化浸出,可以简化选矿工序,实现铅钼彻底分离,避免铅对钼产品的连环污染。钼和铅外金属元素从浸出液回收,铅和贵金属从浸出渣回收,金属收率高。还介绍了卧式常压强化浸出槽的特点和功能。

清洁的炼铜工艺

本文简要介绍了世界上各种处理硫化铜矿的新型湿法炼铜工艺的发展现状及其日益看好的应用价值。

Bicarbonate activation of hydrogen peroxide: A new emerging technology for wastewater treatment

The serious limitations of available technologies for decontamination of wastewater have compelled researchers to search for alternative solutions. Catalytic treatment with hydrogen peroxide, which appears to be one of the most efficient treatment systems, is able to degrade various organics with the help of powerful ·OH radicals. This review focuses on recent progress in the use of bicarbonate activated hydrogen peroxide for wastewater treatment. The introduction of bicarbonate to pollutant treatment has led to appreciable improvements, not only in process efficiency, but also in process stability. This review describes in detail the applications of this process in homogeneous and heterogeneous systems. The enhanced degradation, limited or lack of leaching during heterogeneous degradation, and prolonged catalysts stability during degradation are salient features of this system. This review provides readers with new knowledge regarding bicarbonate, including the fact that it does not always harm pollutant degradation, and can significantly benefit degradation under some conditions.

Leaching of chromite ore in concentrated KOH by catalytic oxidation using CuO as catalyst

CuO was used as a catalyst in the concentrated KOH solution to enhance the leaching of chromium from the chromite ore.The impacts of temperature,KOH-to-chromite ore mass ratio,CuO-to-chromite ore mass ratio,and gas flow rate on the chromiumleaching rate were investigated.The results indicated that CuO played an important role in improving the chromium leaching rate.The leaching rate reached98%after leaching for6h when CuO was applied,whereas it was only60.8%without CuO under thesame reaction conditions:temperature230°C,KOH-to-ore mass ratio6:1,stirring speed700r/min,gas flow rate1L/min.Accordingto the kinetics study,the catalytic oxidation was controlled by surface chemical reaction and the activation energy was calculated tobe15.79kJ/mol when the temperature was above230°C.In contrast,without CuO,the rate-determining step was external diffusionand the apparent activation energy was38.01kJ/mol.

复杂多金属银铜精矿湿法高效分离新工艺

采用硝硫酸浸铜-氧化焙烧脱硫-硝酸浸银、铅-水合肼还原银的实验流程,精矿中铜的回收采用硝硫混酸催化氧化浸出、浸液再经置换得到海绵铜;浸铜渣经氧化焙烧脱硫、碳酸钠转化后,用硝酸浸出其中的银、铅,再用氯化沉银分离银、铅,最终通过水合肼还原得到银粉,硫酸沉铅得到粗硫酸铅作为火法炼铅原料。精矿中的铁和少量的砷采用铁矾法净化脱除。结果表明:采用此工艺流程处理复杂多金属银铜精矿,银直收率达到90%以上,铜直收率达到93%以上,铅直收率达到92%以上。