THE SYNERGISTIC MECHANISM OF SOLVENT EXTRACTION OF GOLD IN HCl MEDIA WITH TOA AND TOPO

Ｃｈｌｏｒｉｎａｔｉｏｎｉｎａｑｕｅｏｕｓｓｏｌｕｔｉｏｎｉｓｏｎｅｏｆｔｈｅｍａｊｏｒｍｅｔｈｏｄｓｉｎｈｙｄｒｏｍｅｔａｌｕｒｇｙｏｆｇｏｌｄ，ｅｓｐｅｃｉａｌｙｔｈｅｅｘｔｒａｃｔｉｏｎｏｆｇｏｌｄｆｒｏｍａｎｏｄｅｓｌｉｍｅ．Ａｌｔｈｏｕｇ...     

TMK小体积萃取法测定痕量金

介绍了TMK-TBP（硫代米蚩铜-膦酸三丁酯）小体积萃取法测定痕量金,该方法简便快速,所需设备简单,可用于实际样品中痕量金的测定,其最低检测限为1.5ng/ml.方法的精密度为5.24%。     

Mechanism of crud formation in copper solvent extraction

The authors investigated the mechanism of crud formation in copper solvent extraction. It is indicated that pH value of solution and the phase ratio (O/A) are the main factors affecting crud formation in solvent extraction. The amount of crud extraction increases with aqueous pH value increase, and reduces with the increase of the phase ratio. Fe3 , Mg2 , fine air bubble and suspended particulates in leaching solution contribute to crud formation. One case is that a series of reactions of hydrolization and polymerization occurs for Fe3 , while pH＞2.5, polyhydric complex or Fe-SO4 complex are formed. Then the complex-ions of FeOH2 , Fe2(OH)4 2 cause poly-reaction, which is likely to lead emulsion. The study on Zeta potential indicates the repulsion between electriferous droplets in solvent extraction prevents phase coalescence, which is one of the major reasons for emulsion.     

液珠萃取比色法测定化探样品中的金、银

在10%HCl介质中,采取用二苯硫脲(DPTU)-甲基异丁酮(MIBK)泡沫塑料富集,以金试剂液珠萃取比色法,连续测定化探样品中Au和Ag.该方法机理在于当富集Au和Ag的DPTU-MIBK泡塑灰化后,用1+1HNO3溶解Ag,Au不溶于HNO3而留在残渣中.利用吸管吸取Ag的有色液珠,可将Au和Ag分离.方法的检出限(10g称样):Au0 5×10-9,Ag5×10-9.     

Separation of copper and iron from chloride media using Cyanex 921 in kerosene

The extraction and separation of Cu（Ⅱ） and Fe（Ⅲ） from HCl media using Cyanex 921 in kerosene were investigated.The effect of shaking time,aqueous phase acid concentration,Fe（Ⅲ）/Cu（Ⅱ） concentration,Cyanex 921 concentration,temperature and aqueous to organic phase ratio on the separation of Cu（Ⅱ） and Fe（Ⅲ） was studied using 0.1 mol/L Cyanex 921 in kerosene.Maximum separation was achieved from 2 mol/L HCl containing 0.001 mol/L Cu（Ⅱ） and 0.005 mol/L Fe（Ⅲ） with 0.1 mol/L Cyanex 921 in kerosene.Feasible separation of copper and iron was also possible from 5 mol/L HCl using 0.02 mol/L Cyanex 921.     

Locating mechanism study of several types of gold deposits

Based on the availabities of three ore-controlling factors, the authors put forword the locating mechanism of gold deposits. The model experiment indicates that the pressure-release effect occuring during the locating process marks the metallogenic nonlinear effect and causes the formation of deposits. In addition, the deposits involved in this paper can be divided into four kinds of locating mode. Synopsis of the first author Li Peilan, professor, born in 1938, majoring in mineralogy, ore deposit, experimental mineral-rock and applied geochemistry-thermodynamics, has published more than 50 papers and books, such as ?Geological chemistry-thermodynamics?.     

Extraction of gold, palladium, and platinum from acidic media with cyclic sulfoxide derivative

The extraction of gold (Ⅲ), palladium (Ⅱ), and platinum (Ⅳ) from the acidic media with the cyclic sulfoxide derivative of a-dodecyl-tetrahydrothiophene 1-oxide (dtmso) was investigated. Gold (Ⅲ), palladium (Ⅱ), and platinum (Ⅳ) could be separated from the acidic media with suitable sulfoxide concentration and acidity. The extraction reaction of gold (Ⅲ), palladium (Ⅱ) or platinum (Ⅳ) is exothermic when dtmso is used as an extracting reagent. The coordination number was studied by the slope method. The results indicate that, in high acidity, the dtmso coordination number for extracting gold (Ⅲ) or palladium (Ⅱ) is 3, and that for platinum (Ⅳ) is 2. UV and FT-IR spectra were used to analyze the structure of the complex. Gold (Ⅲ) is coordinated with the oxygen atom in S=O group in dtmso, and palladium (Ⅱ) or platinum (Ⅳ) is coordinated with the sulfur atom in S=O group in dtmso.     

高位阻叔胺(N_(3418))自盐酸溶液中萃取钯的研究

以高位阻叔胺萃取剂Ｎ３４１８自盐酸溶液中对Ｐｄ（Ⅱ）进行了萃取研究．对萃取时间、水相的酸度、水相ｐＨ值、萃取剂的浓度、稀释剂等影响因素进行了较全面的分析；用硫脲作反萃剂对反萃率进行了探讨．应用连续变换法、饱和法、斜率法确定了配合物的组成为１∶４，并用红外光谱对萃合机理进行了初步讨论．     

Formation mechanism of breccia pipe type in Yixingzhai gold deposit

Based on the basic geological features of Yixingzhai gold deposit, the geological features, classification and relation to mineralization of breccia pipes were discussed by surveying the xenoliths and breccia＇s mineral composition, structure and construction, typical mineralization alteration phenomenon on field and microscopic anatomy in breccia pipes. And the ore-controlling mechanism and the formation mechanism of the blasting breccia pipes were investigated. The main conclusion shows that Hewan and Nanmenshan breccia pipes nearby the NW-striking deep fault are shaped earlier, belonging to the acidic siliceous ingredient production of ultra-hypabyssal magmatic in the late magma stage; Tietangdong and Nanmenshan breccia pipes that are shaped latter are the ultra-hypabyssal auriferous fluid production composed mainly of the skarn in the hydrothermal stage after the magma period. Both root in the unified deep magmatic chamber, belonging to differentiation derivatives at different stages in the deep magmatic chamber.     

Study on mechanism of gold leaching by thiourea in the presence of sodium sulphite

Ｃｙａｎｉｄａｔｉｏｎｈａｓｂｅｅｎｕｓｅｄｆｏｒｍｏｒｅｔｈａｎｏｎｅｈｕｎ ｄｒｅｄｙｅａｒｓｉｎｇｏｌｄｉｎｄｕｓｔｒｙｓｉｎｃｅｔｈｅｆｉｒｓｔｐａｔｅｎｔｂｙＭａｃＡｒｔｈｕｒａｎｄｔｈｅＦｏｒｒｅｓｔｓｉｎ 1889[1] ,ａｎｄｓｔｉｌｌｒｅｍａｉｎｓｔｈｅｍｏｓｔｐｏｐｕｌａｒｏｐｔｉｏｎｆｏｒｐｒｏｃｅｓｓｉｎｇｇｏｌｄｏｒｅｓｂｅｃａｕｓｅｏｆｉｔｓｐｒｏｃｅｓｓｓｉｍｐｌｉｃｉｔｙａｎｄｏｐｅｒａｔｉｏｎｅｃｏｎｏｍｙ .Ｎｅｖｅｒｔｈｅ ｌｅｓｓ,ａｐｐｌｉｃａｔｉｏｎｏｆｔｈｅｔｅ…     

在线萃取FIA－GFAAS法测定超痕量金

通过研究在线液－液萃取ＦＩＡ－ＧＦＡＡＳ法测定环境样品中超痕量金的方法，着重探讨了重力分相器的应用前景及其限定条件。在线萃取测定中，Ａｇ的检出限为０．０３ｎｇ／ｍｌ，１ｕｇ／ｍｌＡｕ的测定精度为２．７％（ｎ＝１１），采样频率为３６次／时，富集倍数为２０倍。     

Mechanism of gold dissolving in alkaline thiourea solution

Reaction mechanism of gold dissolving in alkaline thiourea solution was studied by electrochemical methods,such as cyclic voltammetry,chronopotentiometry,AC impedance,linear sweep voltammetry.Apparent activation energy of anodic process of gold electrode dissolving in alkaline thiourea solution is 14.91 kJ/mol.Rate determining step is the process of gold thiourea complex diffusing away from electrode surface to solution.The results of AC impedance and chronopotentiometry indicate that thiourea adsorbs on gold electrode surface before dissolving in solution.There does not exist proceeding chemical reactions.Formamidine disulfide,the decomposed product of thiourea,does not participate the process of gold dissolution and thiourea complex.Species with electro-activity produced in the process of electrode reaction adsorbs on the electrode surface.In alkaline thiourea solution,gold dissolving mechanism undergoes the following courses:adsorption of thiourea on electrode surface;charge transfer from gold atom to thiourea molecule;Au[SC(NH2)2]ads receiving a thiourea molecule and forming stable Au[SC(NH2)2]2 ;and then Au[SC(NH2)2]2 diffusing away from the electrode surface to solution,the last step is the rate-determining one.     

Separation of cobalt and nickel by non-equilibrium solvent extraction

Ｓｏｌｖｅｎｔｅｘｔｒａｃｔｉｏｎｉｓｇｅｎｅｒａｌｌｙｂｅｌｉｅｖｅｄｔｏｂｅａｋｉｎｄｏｆｅｑｕｉｌｉｂｒｉｕｍｅｘｔｒａｃｔｉｏｎｏｎｔｈｅｃｏｎｄｉｔｉｏｎｔｈａｔｔｈｅｔｗｏｐｈａｓｅｓａｒｅｍｉｘｅｄｆｏｒｅｎｏｕｇｈｔｉｍｅａｎｄｔｈｅｅｘｔｒａｃｔｉｏｎｐｒｏｃｅｓｓｃａｎｒｅａｃｈｔｈｅｓｔａｔｅｏｆｔｈｅｒ ｍｏｄｙｎａｍｉｃｅｑｕｉｌｉｂｒｉｕｍ .Ｓｏｍｅｔｉｍｅｓ ,ｔｈｉｓｋｉｎｄｏｆｅｑｕｉｌｉｂｒｉｕｍｅｘｔｒａｃｔｉｏｎｃａｎｎｏｔａｃｈｉｅｖｅｓａｔｉｓｆａｃｔｏ…     

Emplacement mechanism of the super-large Jingshan gold deposit in Jiangxi, China

Jingshan superlarge gold deposit is a typical deposit closely related to the ductile shear zone, developing the economic enrichment during the transition form the ductile deformation to the brittle deformation. The ore-forming process of Jingshan Au deposit can be described as the development of marine volcanic-turbidity current Au-bearing initial sedimentation → regional metamorphism and the first enrichment → strong transformation of dynamic metamorphism and deformation→ore-controlling and ore-holding of ductile shear structure→supperimposed transformation and enrichment of magma-hydrothermal solution. This process can be summarized as the “source-migration-accumulation” metallogenic-geochemical process of Au. The proved Au reserve of this deposit has exceeded 100 t and its prospect of searching for ore is considerable. So it is called the only super-large gold deposit in the south of the lower reach of the Yangtze River, China. Project supported by the Key Program of the 8th Five-Year Plan of China Synopsis of the first author Li Peizheng, associate professor, born in Dec. 1948, majoring in Geotectonic and Metallogent Gold Deposits Geochemistry.     

Artificial neural network modeling of gold dissolution in cyanide media

The effects of cyanidation conditions on gold dissolution were studied by artificial neural network (ANN) modeling. Eighty-five datasets were used to estimate the gold dissolution. Six input parameters, time, solid percentage, P₈₀ of particle, NaCN content in cyanide media, temperature of solution and pH value were used. For selecting the best model, the outputs of models were compared with measured data. A fourth-layer ANN is found to be optimum with architecture of twenty, fifteen, ten and five neurons in the first, second, third and fourth hidden layers, respectively, and one neuron in output layer. The results of artificial neural network show that the square correlation coefficients (R ²) of training, testing and validating data achieve 0.999 1, 0.996 4 and 0.998 1, respectively. Sensitivity analysis shows that the highest and lowest effects on the gold dissolution rise from time and pH, respectively. It is verified that the predicted values of ANN coincide well with the experimental results.     

磷酸丁酯的润湿增效作用及其在双氧水冷堆工艺中的应用

本文探讨了磷酚三丁酯对壬烷基酸聚氧乙烯醚的润湿增效作用．通过对表面张力、接触角、润湿时间的测定及液晶现象的观察，讨论了增效作用的机理．用于双氧水冷堆工艺也获得了较好的效果．     

异戊醇从氯化物—磷酸体系中萃取磷酸和盐酸

研究了异戊醇的萃取性能 ,考察了水相中磷酸和盐酸浓度、金属离子浓度、初始相比与温度等因素对萃取分离性能的影响 ,得到了最适宜的萃取条件     

黄金矿山信息用户的特征及其服务

本文通过对黄金矿山信息用户的现状和特征的分析 ,阐述了黄金矿山信息用户的信息需求的内容和类型 ,探讨了服务的方法和对策     

磷酸三丁酯萃取分离磷酸与盐酸的研究

系统地研究了磷酸三丁酯从氯化物磷酸体系中萃取分离磷酸、盐酸的性能．考察了水相中磷酸和盐酸浓度、铁、铝、镁、钙等杂质离子浓度、初始相比及温度等因素对萃取分离性能的影响,得到了各影响因素有利于分离的适宜条件以及磷酸的分配方程．     

酸法提取斑点叉尾鮰鱼皮胶原工艺的条件优化

采用酸法从人工养殖的鮰鱼皮中提取胶原,并研究了酸的种类、酸的浓度、料液比、提取时间和提取温度对胶原提取率的影响.正交实验研究结果表明,最适提取工艺条件为：乙酸浓度1.0 mol/L,固液比1∶30,提取时间72 h,在5℃下提取得率为33.79%,提取胶原的最大紫外吸收波长为236 nm,和标准品紫外吸收波长基本一致.