菲律宾某红土矿两段酸浸研究

研究了一段高酸—二段中和两段联合浸出红土矿新工艺。结果表明,该红土矿经人工分级后,细粒级矿石在温度95℃、反应时间6 h、初始矿浆浓度32%、酸矿比1.05的条件下,镍、钴一段高酸浸出率分别为97.39%、94.14%;一段浸出后矿浆与粗粒级矿石矿浆混合后在温度95℃、反应时间15 h、粗细粒级矿石质量比1.34的条件下,镍、钴二段中和浸出率分别为82.04%、93.35%,浸出后液含铁浓度小于2 g/L。     

Soda ash roasting of titania slag product from Rosetta ilmenite

A soda ash roasting process for upgrading titania slag product of Rosetta ilmenite to a high grade titanium dioxide (TiO₂) is presented. The roasting process was carried out at moderate to high temperatures to yield a reaction product that would be easily decomposed by subsequent leaching procedures. Factors affecting the roasting process; namely the soda ash ratio to the slag material, the roasting time and temperature were studied. The optimised conditions used a Na₂CO₃ to slag ratio of 0.55:1 at a roasting temperature of 850 °C for 0.5 h duration period. The impurities associated with the roasted slag were subjected to leaching with water and dilute hydrochloric acid solution leaving synthetic rutile (TiO₂) as insoluble residue. To improve the quality of the synthetic rutile, an alkaline leaching step was added to remove the excess silica present in the treated titania slag. This method is capable of producing high purity synthetic rutile assaying about 97% TiO₂.     

大洋多金属结核冶炼工艺技术经济评价

本文回顾了大洋多金属结核中有价金属提取技术的研究状况,简要分析了工艺的选择原则,并对推荐的３种提取工艺,即熔炼－浸出、还原焙烧－氨浸和加压酸浸进行了评述。就在中国建立第一代结核冶炼厂作了经济分析。     

某银矿选冶试验研究

云南某矿石含银120g/t,银是主要回收矿物,其他矿物暂无回收价值。银在矿石中主要以次生银矿物的形式存在。为了有效回收银矿物,通过开展流程对比试验确定了浮选+酸浸+酸浸尾矿氰化浸出流程。通过条件试验确定了磨矿细度为-48μm占92.91%,氰化钠用量为4kg/t,浸出时间为28h。在开路试验的基础上开展了闭路试验,闭路试验结果:浸出作业回收率79.73%,浮选+酸浸+酸浸尾矿氰化浸出回收率84.17%。     

Degradation of HDPE,LLDPE, and blended polyethylene geomembranes in extremely low and high pH mining solutions at 85 °C

The durability of five 1.5-mm thick geomembranes (GMBs) is investigated in pH 0.5 and 13.5 synthetic mining solutions using immersion tests. Two high density polyethylene (HDPE), two linear low density polyethylene (LLDPE), and one blended polyethylene (BPO) GMBs are investigated at 85 °C for incubation durations of 4.5–6.5 years. It is shown that the degradation of all five GMBs in the high pH solution is faster than in the low pH solution. In the pH 0.5 solution, one of the HDPEs and the BPO GMBs exhibited polymer degradation before or at the time of the depletion of their antioxidants. In pH 13.5, four out of the five GMBs exhibited degradation and followed the conceptual three-stage degradation model until nominal failure. However, there is no correlation between the long-term performance of these GMBs and their resin type or their initial properties since one of the examined LLDPEs outperformed all the higher density/crystallinity GMBs with higher initial properties while the other LLDPE did not perform well. Thus, when selecting a GMB for a desired application, the relative performance of different candidate GMBs can be only assessed using immersion tests using the solutions expected in the field.