Improvement of flotation behavior of Mengzi lead-silver-zinc ore by pulp potential control flotation

The electrochemical behavior of Mengzi lead-silver-zinc ore flotation system was studied. Based on the electrochemical characteristics of sulfide mineral flotation system, a stage potential control flotation was developed with the main parameters of pulp potential（φp）, pH value and collector dosage. Using N,N＇ diphenylamino-dithiolphosphoric acid（NNDDC） as a collector, which has good selectivity for galena flotation at pH 8.8 and pulp potential 330 mV, DDTC is used as secondary collector to improve both the grade and recovery of Pb and Ag. The pulp potential values significantly influence the floatability of practical minerals and single minerals when using NNDDC as the collector. The flotation recovery of galena reaches 85% at about 0.3 V and pH8.8. With the usage of pulp potential control during grinding and flotation, the new pulp electrochemical technology for Mengzi lead-silver-zinc ore flotation was developed. The results show that the grades of Pb and Ag of galena concentrate are 55% and 1 800 g/t, respectively, while the recoveries of Pb and Ag are 86.5% and 65%, respectively, the grade of Zn of marmatite concentrate is 42.5%, and the recovery of Zn is 91.25%.     

Effect of Cu ions on bioleaching of marmatite

The effect of Cu^2＋ ions on bioleaching of marmatite was investigated through shake leaching experiments. The bacteria inoculated are a mixed culture ofAcidithiobacillusferrooxidans, Acidithiobacillus thiooxidans and Lepthospirillumferrooxidans. The results show that zinc is selectively leached, and the addition of appropriate content of Cu^2＋ ions has positive effect on the bioleaching of marmatite. SEM and EDX analyses of the leaching residue reveal that a product layer composed of iron sulfide, elemental sulfur and jarosite forms on the mineral surface. The biooxidation of elemental sulfur is catalyzed by the Cu^2＋ ions, which eliminate the barrier to bioleaching of marmatite and keep low pH value. With the addition of 0.5 g/L Cu^2＋ ions, the maximum zinc extraction rate reaches 73% after 23 d at the temperature of 30 ℃ with the pulp density of 10%, while that of iron is only about 10%.     

软锰矿和浮选方铅矿共同浸出液的净化

对浮选方铅矿精矿和软锰矿两矿共同浸出含锰溶液中Fe 、Pb 杂质的净化工艺条件进行了研究。结果表明, pH =4 时, 采用针铁矿法除铁, 能有效去除浸出液中的Fe 离子; 在温度为45 ℃、pH =4、硫化剂与方铅矿的质量比为1∶20 时, 采用硫化法去除重金属, 浸出液中的Fe 、Pb 杂质含量均小于1 mg/L, 满足制备工艺要求。     

Electrodeposition of dixanthogen on surface of pyrrhotite electrode

1　ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｔｈｅｐａｓｔｄｅｃａｄｅｓ ,ｇｒｅａｔａｄｖａｎｃｅｓｔｏｗａｒｄｓｕｎ ｄｅｒｓｔａｎｄｉｎｇｔｈｅｒｅａｃｔｉｏｎｓｏｆｓｕｌｆｉｄｅｍｉｎｅｒａｌｓｕｒｆａｃｅｗｉｔｈｘａｎｔｈａｔｅｒｅａｇｅｎｔｓｈａｖｅｂｅｅｎｍａｄｅ .Ｔｈｅｋｅｙｔｏｔｈｅｓｅａｄｖａｎｃｅｓｉｓｒｅｃｏｇｎｉｚｉｎｇｔｈａｔｔｈｅｒｅａｃｔｉｏｎｓｉｎ ｖｏｌｖｅｃｈａｒｇｅｔｒａｎｓｆｅｒ .Ｍａｎｙｄｙｎａｍｉｃｅｌｅｃｔｒｏｃｈｅｍｉｃａｌｔｅｃｈｎｉｑｕｅｓｈａｖｅｂｅｅｎａ…     

Electrochemical oxidation of sodium sulfide on rotating ring-disc electrode

1　ＩＮＴＲＯＤＵＣＴＩＯＮＳｏｄｉｕｍｓｕｌｆｉｄｅｉｓａｃｏｍｍｏｎｒｅａｇｅｎｔｏｆｆｌｏｔａｔｉｏｎ .ＩｔｃａｎｂｅｕｓｅｄｔｏｄｅｐｒｅｓｓｔｈｅｃｈａｌｃｏｐｙｒｉｔｅｉｎＣｕ Ｍｏｆｌｏｔａｔｉｏｎｓｅｐａｒａｔｉｏｎ ,ａｎｄｉｔｉｓａｌｓｏｔｈｅａｃｔｉｖｅｒｅａｇｅｎｔｏｆｎｏｎｆｅｒｒｏｕｓｏｘｉｄｅｍｉｎｅｒａｌｓ .Ｉｎａｄｄｉｔｉｏｎ ,ｓｏｍｅｓｕｌ ｆｉｄｅｍｉｎｅｒａｌｓｗｈｉｃｈｐｏｓｓｅｓｓｇｏｏｄｅｌｅｃｔｒｏｎｉｃｃｏｎｄｕｃｔｉｖ ｉｔｙ ,ｓｕｃｈａｓｃｈａｌｃ…     

Effect of chloride ion on bacterial pre-oxidation of arsenic-containing gold concentrate

The bacterial pre-oxidation process of arsenic-containing gold concentrates and the bacterial activity under different chloride ion concentrations were studied by using a mixture of thermophilic strains TCJ domesticated in production. The experimental result shows that with different samples and leaching systems, the adaptability and Cl⁻ tolerance of bacteria are different, and that appropriate chloride ion concentration is conductive to bacterial oxidation, while higher chloride ion concentration will inhibit the bacterial activity and affect the pre-oxidation performance. Under the present production conditions, TCJ can adapt to the changes of water quality in the source of water and its critical chloride ion tolerance value is 2.7 g/L.     

蒙自铅锌矿选矿废水净化处理与回用研究

比较了聚合硫酸铁、聚合氯化铝和明矾3种混凝剂对蒙自铅锌矿选矿废水的处理效果。在此基础上,选择聚合硫酸铁并配合使用助凝剂聚丙烯酰胺,通过混凝沉降去除废水中的金属离子,然后再用活性炭吸附废水中的残留有机药剂,使废水的金属离子含量和化学耗氧量均达到了排放标准。采用处理后的废水对蒙自铅锌矿矿石进行铅锌浮选试验,获得了与采用新鲜水时相近的选别指标,证明处理后废水完全可以回用于选矿生产。     

铜砷硫化铁矿浮选新工艺的研究

通过调整矿浆电位和矿浆ｐＨ，优先进行黄铜矿的自诱导浮选，实现了天然矿石中的铜－砷、铜－锌的分离，对广西珊瑚矿的铜砷硫化铁矿进行了微捕收剂浮选分离的研究，与常规的黄药捕收浮选相比，自诱导优先浮选的铜精矿品位较高。表明自诱导浮选和分离过程有更高的选性，为铜精矿降硫，砷和锌提供了新途径。     

江西某低品位锂云母矿浮选试验研究

以江西某低品位锂云母矿为研究对象,进行了浮选试验研究。试验结果表明,以HQ-330和十二胺作为组合捕收剂,质量比3.5∶1时,浮选效果最好。采用"1粗2精1扫"的闭路浮选流程,可以得到Li2O品位为3.09%、回收率为70.96%的锂云母精矿。     

某细粒浸染高硫难选铅锌矿选矿新工艺研究

广东某特大型硫化铅锌矿床,因其特有的地质现象和选矿技术难点而闻名中外。通过系统的工艺矿物学研究查明其难选的原因,并分析总结前人已有的技术成果和有益经验,开展新工艺研究。研究采用优先浮选工艺,针对铅中矿中部分细粒方铅矿浸染于黄铁矿之间而致使传统方法无法解离的特性,创造性地引入了超细搅拌磨显著地提高了中矿解离度,有效地提高了铅回收率;同时针对该选厂传统高碱法抑制黄铁矿而引起诸多生产问题的现状,采用新型环保有机小分子抑制剂QS部分取代了石灰,并取得了更为优越的选矿指标。