从难选金矿中回收金、铜

为了从多金属复杂难选金矿中综合回收金、铜等有价元素,采用氧化强化浮选工艺,在原矿w(Cu)=1.09%、w(Au)=3.92g/t的情况下,充气氧化时间为10min时,可较好地实现铜硫分离,可获得铜品位15.11%、回收率77.48%～77.72%,含金36.35～38.42 g/t、回收率59.00%～62.35%的合格铜精矿.     

曲酸生产菌的选育和培养基的初步优化

通过对 Aspergillusoryzae 2 3 3 7进行紫外线诱变 ,筛选出突变菌株 ZX2 0 0 5,曲酸产量 ρ从 0 .0 56g/l提高到 5.98g/l,并确定 ZX2 0 0 5菌株的最佳发酵培养基 :w(葡萄糖 )=1 0 % ,w(酵母提取物 ) =0 .5% ,w( KH2 PO4 · 7H2 O) =0 .1 % ,w( Mg SO4 · 7H2 O) =0 .0 5% ,w( Vc) =0 .5% ,发酵温度为 3 0℃ ,初始 p H为 4.0 ,转速为 1 80 r/min,发酵周期为 9天     

6-硝基苯并噻唑三氮烯与铜的显色反应研究——原子吸收分光光度计应用于分子吸收测定

用原子吸收分光光度计取代可见 紫外分光光度计以Fe空心阴极灯为光源 ,测定 6 硝基苯并噻唑三氮烯与铜的显色反应 .在曲拉通X 1 0 0存在下 ,pH =1 0 .8～ 1 2 5酸度范围内 ,6 硝基苯并噻唑三氮烯与铜形成红色络合物 ,λmax=53 9.8nm ,ε表观 =1 4 6× 1 0 5L·mol- 1·cm- 1,铜含量在 0～ 60 0 μg/L范围内服从比尔定律 .应用于铝合金中铜含量的测定 ,RE为 0 4 2 % ,RSD为 1 3 % ,加标回收率为 1 0 0 4 % .     

MPT-AES法测定核桃油中铜和铁

用微波等离子炬(MPT)作激发光源, 氩气为载气, 用气动雾化进样, 研究了微波等离子体炬原子发射光谱法(MPT - AES)测定核桃油中铜和铁元素。考察并优化了微波功率、工作气流量、载气流量、氧屏蔽气流量、酸效应、共存离子等实验参数。测定铜和铁的检出线分别为5. 3 , 22. 1 ng / mL 。RSD均小于3. 2 %, 线性范围分别为0. 05～ 100 , 0. 1 ～ 100μg /m L, 加标回收率均在96. 4 %～ 102. 2 %。     

贵州某地混合铜矿选矿试验研究

对贵州某地混合铜矿石进行了选矿试验研究。原矿入选品位Cu 1.27%、Ag 3.80 g/t,含As 4.46 g/t,铜氧化率为23.87%,属混合铜矿。根据矿石性质,分别拟定并开展了"氧硫混选""氧硫分选"和"浮选—尾矿酸浸"3种选铜工艺的探索对比试验,试验结果表明,"浮选—尾矿酸浸"是适宜的选铜流程。试验表明:1)在较佳的分选条件下,原矿经"浮选—尾矿酸浸"联合流程选别后,可获得铜精矿产率4.41%、Cu品味20.52%、回收率73.05%;浸液铜品位880.00 mg/L、浸出率14.16%,铜总回收率87.21%的技术经济指标。铜得到了回收利用。     

云南某低品位高结合率氧化铜矿选冶联合试验研究

云南某难选铜矿石属低品位高结合率氧化铜矿,采用选冶联合工艺实现了对该铜矿的高效回收.浮选试验研究表明,磨矿细度为-0.074 mm占80%,调整剂水玻璃用量800 g/t,组合捕收剂丁黄药+异戊黄(1∶1)用量240 g/t,铜回收指标最佳,经二粗二精闭路试验获得的铜精矿中铜品位9.17%,回收率17.76%.浮选尾矿经磁选除铁,磁选尾矿采用硫酸浸出,当磨矿细度为-0.045 mm占54%,硫酸用量60 kg/t,液固比3∶1,转速250 r/min,浸出温度45℃,浸出时间2h时,铜浸出率为81.88%,铜的综合回收率达86.55%.     

催化动力学分光光度法测定痕量铜

基于邻苯二甲酸氢钾介质中铜(Ⅱ)催化溴酸钾氧化萘酚绿B的褪色反应,建立了测定痕量铜(Ⅱ)的新方法.实验结果表明:测定的线性范围为0～3 mg·L-1,线性回归系数0.999 5,表观摩尔吸光系数1.36×104L·mol-1·cm-1,检出限2.78×10-4mg·L-1.回收率在89.75%～108.5%之间.用于测定运河水中的痕量铜,得到满意的结果.     

水中痕量锰的分光光度法测定

在溴化十六烷基吡啶存在下 ,锰与磺基水杨酸、水杨基荧光酮形成四元配合物 ,摩尔比为n(Mn)∶n(Ssal)∶n(SF)∶n(CPB) =1∶1∶1∶1 ,λmax=590nm ,ε5 90 =1 .58× 1 0 5 .锰在 9.2～ 1 0 2 μg/L ,符合比耳定律 ,回归方程为 :A =- 0 .0 0 1 2 7+ 0 .0 1 59× 1 0 7C ,相关系数r =0 .9982 ,平均回收率为98.4 % .此方法可用于自来水中锰的测定     

分光光度法测定钼矿尾矿及钙铁榴石中微量镓

以碱熔法制备试样溶液,在盐酸(6 mol/L)介质中,用甲苯-乙酸丁酯(6+4)萃取氯镓酸络阴离子,罗丹明B显色,在最大吸收波长λmax=560 nm处测定微量镓含量,方法准确,选择性好。三氧化二镓在0～10μg/mL范围内符合朗伯-比耳定律,直线回归方程为:A=0.655c-0.009 3,相关系数r=0.999 5,摩尔吸光系数为1.19×105L·mol-1·cm-1,平均回收率为98.6%～100.4%。     

西藏甲玛高氧化率铜铅锌矿混合浮选试验研究

针对西藏甲玛矿区高泥铜铅锌矿石性质复杂、氧化率高、现场浮选回收率低的特点,采用硫化钠作为硫化剂及矿泥调整剂,XP4作为组合捕收剂,丁铵黑药作为辅助捕收剂,开展了条件优化试验、开路流程试验和闭路试验研究.通过一粗三精两扫、中矿顺序返回的浮选闭路流程,在原矿含Cu 0.53%,含Pb 1.29%,含Zn 0.54%,Au和Ag含量分别为0.28 g/t、23.6 g/t的条件下,获得的浮选混合精矿的技术指标为:Cu品位为7.72%,回收率为70.15%;Pb品位为22.17%,回收率为90.98%;Zn品位为4.81%,回收率为42.19%;Au品位为1.8 g/t,回收率为47.41%;Ag品位为340.4 g/t,回收率为77.32%.与现场生产指标对比,铜的回收率提高了17个百分点,铅的回收率提高了39个百分点.     

由龙头汪金矿硫精砂中综合回收金银铜的研究

研究探讨了从硫精矿中综合回收金银铜的途径．确定了最易实现工业化的浮选流程。在原硫精矿害Cu、Au、Ag、S分别为0．67%、5．01g／t、17．23g／t、35．17%的情况下，经氧化浮选后，可获得铜金精矿；βCu=15．59％．βAu=112g／t．βAg=210g／t，εCu=77．74%，εAu=40.72%，浮选尾矿中βs=35．42%，εs=97．31%，可作为硫精矿出售。     

提高因民公司铜精矿中金品位试验研究

不改变因民公司选厂现有浮选工艺流程,并在保持现有铜选矿技术指标(铜回收率84.50%,铜精矿品位24%)不变的基础上,通过试验研究,将铜精矿中的金品位由现在的0.80 g/t提高到1.00 g/t(计价品位)以上,提高企业收入,同时提高资源综合利用率,实现矿山的持续健康发展。     

Influence of copper minerals on cyanide leaching of gold

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Pretreatment of copper-bearing refractory gold ores by bio-heap leaching

The refractory gold ores associated with rich copper and trapped in pyrite and quartz were studied. With conventional technique （all-sliming cyanidation）, the gold recovery rate is only 51.78%. To eliminate the negative effects of copper and pyrite on cyanidation and increase the gold recovery rate, the investigation on bio-heap leaching pretreatment was made, by which Cu would be dissolved and gold would be liberated from pyrite. The experiment adopted mixed bacteria, mainly ThiobaciUus ferrooxidan （named T.fl ）, as the bacterial catalyst for bio-preconditioning and was carried out in a PVC column with a diameter of 20 cm and a height of 1.3 m loaded with gold ores. The temperature was controlled between 28 and 30℃, the pH value was kept between 2.0-2.5, and the flux of sprinkling bacterial liquid was maintained 0.80 L/h. After 45-day＇s bio-oxidization, among the samples sizing from 0 to 5 mm, the oxidation rates of Cu, Fe and S were respectively 44.62%, 28.16% and 25.46%, and the gold recovery rate by cyaniding increased to 80.35%. The bio-heap leaching pretreatment can therefore effectively dissolve Cu and liberate gold from pyrite and lead to the increase of gold extraction.     

采用有机抑制剂进行无石灰铜硫分离及机理研究

研究了在低碱条件下淀粉、焦性没食子酸、水杨酸、单宁酸、乳酸等多种有机抑制齐j及它们之间的组合物对黄铜矿、黄铁矿可浮性的影响．选择焦性没食子酸＋单宁酸作为黄铁矿的高效抑制剂,进行铜硫人工混合矿的浮选分离试验和实际矿石的铜硫浮选分离试验,该工艺与传统的石灰工艺比较,铜精矿中的金的品位提高1．24g／t,回收率提高7．74％;银的品位提高4．56g／t,银的回收率提高6．18％;钼的品位提高0．145％,钼的回收率提高35．29％．最后对其作用机理进行分析．     

Techniques of copper recovery from Mexican copper oxide ore

Mexican copper ore is a mixed ore containing mainly copper oxide and some copper sulfide that responds well to flotation. The joint techniques of flotation and leaching were studied. The results indicate that an ore containing 19.01% copper could be obtained at a recovery ratio of 35.02% by using sodium sulfide and butyl xanthate flotation. Over 83.33% of the copper oxide can be recovered from the tailings by leaching in suitable conditions, such as 1 h stirring at a temperature around 25 ℃ with a mixing speed of 500 r/min, an H2SO4 concentration of 1.0 mol/L and a mass ratio of the ore-slurry-liquid to solid (mL/mS) of 3. The overall yield of refined ore after flotation and leaching is over 89.18% of the copper, which is much better than sole flotation or leaching. A copper product containing more than 99.9% copper was obtained by using the process: flotation-agitation leaching-solvent extraction-electro-winning.     

Effects of gold plating on the resistance to high temperature discoloration of the cavity for ceramic packages

The effects of thickness and types of gold plating on the resistance to high temperature discoloration of gold plating on cavity surface of ceramic package were investigated. It was found that the thicker gold plating, the less discoloration degree for ceramic packages. Non-cyanide gold plating performed better resistance to high-temperature aging than cyanide gold plating. The relationship between the gold plating thickness and the amount of diffused Ni to the gold plating of ceramic packages with Au/Ni and Au/Ni-Co platings after heating at 420℃ for 15 min was also studied. When the gold plating thickness reach 2.0 μm and 1.6 μm for Au/Ni and Au/Ni-Co plating systems, respectively, no discoloration was observed on the gold plating surface of cavity, and the corresponding diffused Ni amounts (mass fraction) are 1.0% and 0.4%, while the diffused Co to the gold plating is 0.04%.     

Improved recovery of a low-grade refractory gold ore using flotation–preoxidation–cyanidation methods

In this work, different flotation–preoxidation–cyanidation methods are considered for treating a low-grade refractory gold ore. On the one hand, the results of selective flotation show that 22% and 31.1% of total Sb and As, respectively, remained in the final tailings and only about 28% of the total Au remained for further cyanidation processes. On the other hand, in bulk method of flotation the maximum Au recovery of 90.6% achieved after 60 min of flotation at the grind size with K80 of 146 micron. In addition, the bulk flotation method resulted in the concentrate with low concentrations of Sb and As elements. To improve the recovery of low-grade refractory gold ores, flotation should be followed by roasting, biological, or pressure oxidation processes so that the gold could be liberated prior to cyanidation processes. It is also found that the pressure oxidation pre-treatment of the concentrates prior to cyanidation may yield high gold recoveries of over than 83%. In these processes, recoveries are controlled by the temperature and the oxygen partial pressure in the solvent. However, by utilizing the bio-oxidation technique, the oxidation of sulfur to sulfate cannot be completed and, consequently, the gold recovery may be limited to only 72.2%.     

氨基磺酸法剥离废印刷线路板表面镀金层的研究

含有贵金属金的废弃印刷线路板有较高回收价值。采用氨基磺酸腐蚀法,浸出镀金层下的铜和镍,回收得到金箔。探索氨基磺酸法回收金的最佳工艺条件,研究结果表明:常温条件下,取内存条与氨基磺酸溶液的固液比(g/mL) 1:5,双氧水体积分数15%,氨基磺酸浓度70 g/L,废旧内存条浸出时间120 min (不同类型板因镀层差异剥落时间稍有差异),此工艺条件下金的回收率可以达到96%以上。氨基磺酸腐蚀法对金的回收选择性好,剥离的金箔可直接熔炼,脱金后的线路板可用于回收其他金属和非金属;溶液回收铜镍后,可循环使用,实现回收过程中的闭路循环,减轻环境污染。     

Study on Shaxi porphyry copper-gold deposit in Anhui:gold mineralization and occurrence determination by PIXE

1　INTRODUCTIONParticleinducedX rayemission(PIXE)isanide almethodtoinvestigatethegoldoccurrenceindiffer enttypesoforedeposits[1 4 ] .Usingthedynamicanal ysismatrixtransformalgorithm ,PIXEdatacanbeusedtogeneratequantitativelytrueimagesoftraceel ementspatialdistributioninminerals .Themoderntechniqueisproventobeveryusefultostudytheoremineralsandcanevenbeusedtodetectvaporphaseinfluidinclusionsintheoredepositresearch .Forexam ple ,inthecaseofcoexistingbrineandvaporinclu sionsfromIndonesian…