锌浸出渣火法处理工艺探讨

叙述了国内外锌浸出渣火法处理的主要工艺及装备,对技术、能耗及存在的问题进行了分析,探讨了锌浸出渣处理的新技术和应用前景.     

锌浸出渣挥发窑处理烟气收尘

文章根据株洲冶炼厂挥发窑烟气收尘的生产实践，论述了内滤式袋式收尘、低压脉冲喷吹袋式收尘、电收尘等收尘装置生产概况，并对其发展了深入探讨。     

锌浸出渣挥发窑处理系统的优化

叙述了株冶5^#挥发窑的特点和历年来进行的改造，对窑寿、烟尘回收、渣含锌、设备自动化等方面存在的问题进行了分析和探讨，提出了优化解决的方法。     

延长锌浸出渣挥发窑寿命的实践

分析了影响锌浸出渣挥发窑寿命的主要因素，探讨了进一步延长挥发窑寿命的可能性。     

锌浸出渣挥发窑生产工艺与节能

本简述了锌浸出渣挥发生产过程的工艺原理,介绍了挥发窑能源消耗的基本状况,并就挥发窑的节能途径问题进行了探讨,提出了挥发窑的节能措施。     

锌浸出渣挥发锌铅铟试验研究

回转窑挥发法是处理锌浸出渣的成熟工艺,针对某湿法炼锌浸出渣开展还原挥发锌、铅、铟试验研究。结果表明,锌浸渣中的物相主要为铁酸锌,在煤配比30%、挥发温度1 150 ℃、挥发1 h的条件下,锌、铅和铟的挥发率分别为99.92%、99.59和83.46%,窑渣含锌、铅和铟分别为0.025%、0.027%和0.013%。窑渣磁选回收铁,再浮选回收碳、铜和银,尾渣可以作为水泥和砖等建材原料。     

从银锌渣中回收银

用氯化法处理银锌渣回收银的方法适宜于乡镇企业采用。银锌渣经破碎、焙烧、盐酸浸出、氨浸、火法精炼等工序后,所得成品可达国标二号或三号银锭质量标准。它与传统方法相比工艺简单,资金占用少,经济效益好。     

延长锌浸出渣挥发窑寿命的实践

分析了影响锌浸出渣挥发窑寿命的主要因素，探讨了进一步延长挥发窑寿命的可能性．     

Mineralogical characterization of silver flotation concentrates made from zinc neutral leach residues

Silver flotation concentrates prepared from high-silver (1480 ppm Ag) and low-silver (300 ppm Ag) neutral leach residues have been examined mineralogically to determine the phases present and to elucidate the behavior of silver during zinc processing. The flotation concentrates consist principally of sphalerite although lesser amounts of zinc ferrite and PbSO₄, as well as traces of other phases, also are present. In the high-silver flotation concentrate, silver occurs mostly as Ag₂S or (Ag, Cu)₂S rims on sphalerite although (Ag, Cu)₂S inclusions within sphalerite also are present. Trace amounts of a Cu-Ag-S-Cl phase are present on rare copper oxide grains, and this silver-bearing phase may be a fine mixture of Ag₂S, AgCl, and Cu₂S. In the low-silver flotation concentrate, silver occurs mostly as Ag₂S although traces of silver-bearing CuS and Cu₂S also are present. The Ag₂S occurs as <1 μm particles disseminated in elemental sulfur-silica gel patches, as discontinuous rims or isolated patches on sphalerite grains, and as tiny free particles. Silver chloride was not detected. These studies suggest that silver dissolves during neutral leaching and subsequently reacts with sphalerite or other sulfides to form silver sulfide.     

Mineralogical characterization of silver flotation concentrates made from zinc neutral leach residues

Silver flotation concentrates prepared from high-silver (1480 ppm Ag) and low-silver (300 ppm Ag) neutral leach residues have been examined mineralogically to determine the phases present and to elucidate the behavior of silver during zinc processing. The flotation concentrates consist principally of sphalerite although lesser amounts of zinc ferrite and PbSO₄, as well as traces of other phases, also are present. In the high-silver flotation concentrate, silver occurs mostly as Ag₂S or (Ag, Cu)₂S rims on sphalerite although (Ag, Cu)₂S inclusions within sphalerite also are present. Trace amounts of a Cu-Ag-S-Cl phase are present on rare copper oxide grains, and this silver-bearing phase may be a fine mixture of Ag₂S, AgCl, and Cu₂S. In the low-silver flotation concentrate, silver occurs mostly as Ag₂S although traces of silver-bearing CuS and Cu₂S also are present. The Ag₂S occurs as <1 μm particles disseminated in elemental sulfur-silica gel patches, as discontinuous rims or isolated patches on sphalerite grains, and as tiny free particles. Silver chloride was not detected. These studies suggest that silver dissolves during neutral leaching and subsequently reacts with sphalerite or other sulfides to form silver sulfide.     

湿法炼锌-高酸浸出工艺金银综合回收生产线运行总结

阐述了湿法炼锌高温高酸浸出所产高浸渣综合回收的必要性,对赤峰中色锌业有限公司高浸渣浮选回收金银生产线的运行情况进行总结,分析了存在的问题,提出了下一步工作的方向。     

金精矿氰化中银浸出行为的试验研究

通过对浮选金精矿的工艺矿物学研究,在获得金最大回收率的条件下,探讨银的浸出行为和提高银回收率的方法.     

尾矿库氰渣淋溶废水深度处理工艺研究

针对黄金矿山尾矿库氰渣淋溶的低质量浓度含氰废水,采用OOT/OCT—BAF联合工艺进行处理。其试验结果表明,在进水总氰化合物为64.45 mg/L、硫氰酸盐为22.74 mg/L、COD为76.58 mg/L、铜为72.48 mg/L的条件下,当臭氧投加量为250 mg/L、臭氧投加量分流比为2∶1、BAF的废水停留时间为20 min、气水比为3∶1时,出水总氰化合物为0.02 mg/L、硫氰酸盐完全去除、COD为5.43 mg/L、铜为0.32 mg/L、氨氮为0.79 mg/L,出水达到《GB 3838—2002地表水环境质量标准》Ⅲ类水质。     

Electrochemical leaching of a silver arsenopyrite ore

A silver ore concentrate (≈50 mg/kg Ag) was studied to determine whether electrolytic treatment could be used to enhance silver extraction from the ore. The hydrometallurgical leach was carried out in a batch mode using hydrochloric acid. The ore was mechanically slurried in an electrochemical cell with graphite rod electrodes. A comparison of the extractions using acid, acid + chlorine or electrolytic means was made by measuring silver, iron and sulphur dissolved as a function of time, concentration and sparging gas. The results demonstrated that the electrolytic leach improved both the rate and extent of silver extraction over non-electrolytic leaches. Up to 57% silver extraction was obtained in a 3 hour period compared with 15 to 25% with acid or acid + chlorine leaches respectively. The rate of silver extraction at the end of the 3 hour period was also substantially higher. Under the same conditions only 9% of the iron was extracted from the ore.     

富锗硫化锌精矿的氧压酸浸研究

对云南某地富锗硫化锌精矿进行了氧压酸浸回收锗的试验研究。通过正交试验,研究了浸出温度、浸出时间、氧分压、精矿粒度、酸锌摩尔比和搅拌速度对锗浸出率的影响。结果表明,浸出温度和氧分压是影响锗浸出率的主要因素,在试验选定的条件下,锌和锗的浸出率能达到99%和90%以上。     

常压富氧直接浸出炼锌

硫化锌精矿常压富氧直接漫出是目前世界上锌冶炼的新工艺、新技术,它与传统炼锌比少了精矿焙烧和制酸系统,且锌总回收率高,操作环境优越,是进行环境综合治理、淘汰落后工艺、改善环境、节能减排、循环经济、提高经济效益的好途径.