云南镇沅县载金黄铁矿的生物氧化——氰化浸金研究

本论文研究了在用常规氰化提金以前,用氧化亚铁硫杆菌在改进的qk~*介质中预处理载金难浸黄铁矿的可行性。试验结果表明:细菌氧化该矿,如果铁的氧化率达到67.02％,则氰化浸出生物氧化滤渣的金浸出率为86.86％,而直接氰化浸出的金浸出率仅为12.46％。     

离子交换树脂吸附古龙酸的工艺

应用自行合成的阴离子树脂D02直接吸附发酵液中的2-酮基-L-古龙酸，并研究了其吸附的静态与动态过程．利用Langmuir和Freundlich吸附等温线方程对吸附等温线数据进行拟合，发现2种模型相关性都很好．测定了不同流速、温度、浓度以及pH条件下古龙酸在合成树脂柱中的穿透曲线，当上柱液pH为1．5、质量浓度为10g／L、吸附温度为309K、流速为0．35mL／min时，每g湿树脂的动态附容量为133mg．同时测定了不同洗脱剂、洗脱流速条件下的洗脱曲线．每g湿树脂的动态吸附容量达到了133mg，当温度为283K、洗脱剂为10％H2SO4 CH3OH、流速为0．2mL／min时，洗脱收率可达65．3％．     

Electrochemical behaviors of gold and its associated elements in various complex agent solutions

1　INTRODUCTIONGoldisquitestableanddifficulttodissolveinacommonmineralacid .However ,becausethereisadelectroniclayerunfilledingoldatomicstructure ,goldcanbecombinedwithmanychemicalagentstoformstablecomplexions,causingthepotentialofgoldinasolutiontodecreaseandgoldtodissolveinthesolutioneasily .Basedonthisprinciple ,cyanideisanefficientlixiviatingagentofgold ,andhasbeenwidelyusedtoextractgoldfrom primaryandsecondaryresources .However ,itisthemosttoxicandnotbeneficialtoen vironmentprotection…     

改性聚酰胺对蛋白质的吸附行为的研究

研究了改性聚酰胺树脂对蛋白质的吸附行为,进行了在静态条件下,改性聚酰胺对蛋白质溶液的吸附、洗脱回收的条件实验．结果表明：溶液pH为6左右、温度25℃、振荡时间为60min时其对蛋白质的吸附量为8．715mg／g,吸附率可达85％,去除率最高．吸附等温线较好地符合Langmuir等温方程,吸附行为是放热的物理吸附过程．吸附后用pH为7．96的洗脱液进行洗脱,蛋白质回收率可达到90％以上．     

阴离子交换树脂分离提取发酵液中的乳酸

为提高乳酸产品收率和纯度,实验筛选得到国产315型阴离子交换树脂,用于分离提取发酵液中乳酸,并研究其对乳酸、乙酸、丙酮酸及柠檬酸的吸附等温线、吸附动力学和动态吸附及洗脱效果．吸附等温线结果表明,315型树脂对乳酸等有机酸的吸附等温线符合Freundlich方程,特征参数n>1,属于优惠吸附．吸附动力学研究表明,液膜扩散是吸附过程的主要控制步骤,符合Boyd 液膜扩散模型．动态吸附及洗脱实验结果表明,以15 BV／h、pH 188上柱吸附,再用1 BV／h的去离子水洗脱,可实现发酵液中乳酸的良好分离．     

用氰化法浸取炼银炉炉渣中的金银

对某地炼银炉渣氰化浸出金银进行了较系统的研究，考察了几种不同预处理方法对续后氰化浸取的影响．找到了适宜于该炉渣特点的技术关键：采用加剂焙烧一Ｈ２Ｏ２氧化一氰化浸出的工艺，可使金、银的浸出率分别达７９．１３％和５５．７３％，而传统氰化效果很差，单经加剂焙烧或Ｈ２Ｏ２氧化或加压等预处理后，金、银的浸出率有所提高，但指标不令人满意．     

Adsorption of Macroporous Phosphonic Acid Resin for Nickel

1Introduction Thesynthesischaracterizationandadsorptionproper tyofpolymericmaterialshavebeenresearchedinrecent years[110].Macroporousphosphonicacidresin[11](PAR)isanovelpolymericmaterialwhichcontainsafunctional groupof[PO(OH)2].Ithasalotofadvantagessuchas…     

废旧印刷线路板两步浸出有价金属

为回收废旧印刷线路板中的有价金属,采用两步浸出的方法对其进行处理.先用双氧水-硫酸浸出贱金属,再用王水浸出贱金属浸出渣中的金.10 g废旧印刷线路板贱金属最佳浸出条件为双氧水20 mL,固液比1:5,硫酸浓度5 mol/L,反应温度60℃,反应时间90 min,原料溶损率达90.0%;金最佳浸出条件为反应温度40℃,反应时间30 min,浸出率达97.5%,研究证明两步浸出法能有效处理废旧印刷线路板,金溶出过程受扩散控制。     

ONE-STEP LEACHING OF SOME REFRACTORY GOLD CONCENTRATECONTAINING ARSENIC AND THEORY ANALYSIS

Withlarge--scaleexploitationoftheeasy--toseparateandextractgoldore,theresourcesarebecomingexhausted,whichpressespeopletoexploitandutilizerefractorygoldore.FeAsSandFeS,aremajorsulfidemineralofgoldcarrier,inwhichgoldismaceratedintheformofmicro--particle.Itisdifficulttoseparategoldtomonomersbyfinegrinding.Thiskindofgoldoreisatypicallyrefractoryore.Furthermore,FeAsSandFeS,,especiallyFeS,,aresuchstablesulfidemineralsthatsomeextremetreatment(suchashigh--temperature,high--pressureandacuteoxidant…     

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.     

黄铁矿伴生金回收研究进展

Pyrite is one of the most important minerals bearing gold, and also the major resource of the gold production in China. However, the gold associated with pyrite is reported to be finely disseminated in complex structure, resulting in great recovering difficulty. This article reviews the mineralogical characteristics of gold associated with pyrite, and the research progress of common physical and chemical beneficiation processes for it. The principle of each gold extraction method and its applications in the recovery of gold associated with pyrite were illuminated, the merits and demerits of each method were discussed as well from the aspects of process cost, environmental hazard and gold leaching efficiency, etc. It is pointed out that, for refractory gold associated with pyrite, developing effective pretreatment process and highly selective leaching aids will be the future research directions to improve the gold leaching efficiency.
     

Adsorption characteristics of thiobacillus ferrooxidans on surface of sulfide minerals

By using thiobacillus ferroxidans (T. f) from Qixiashan, Hubei Province, China, the adsorption characteristics of T. f on surface of sulfide mineral were studied. The influences of adsorption time, pH value, temperature, initial inoculated concentration of bacteria, concentration of sulfide mineral powder, and variety of minerals on the adsorption characteristics were firstly investigated by using the ninhydrin colorimetric method, and the changes of contact angles and Zeta potentials of mineral surface during the bacterial adsorption were then determined. The results show that when the leaching experiments are performed for a long time from several days to a month, the maximal quantity of adsorption of T f on the surface of pyrite is obtained under the following conditions: leaching for 20 d, pH value in range of 1–2 and temperature at 30 °C, respectively; when the bio-leaching experiments are performed for a shorter leaching time, the maximal quantity of adsorption is obtained under the conditions: bio-leaching for 2 h, at 2.4×10⁷ cell/mL of initial inoculated bacteria concentration, and at 10% of mineral powder concentration; and the adsorption quantities are different from one sulfide mineral to another, and the adsorption of T. f on the surface of sulfide minerals includes three phases: increasing phase, stationary phase and decreasing phase. Foundation item: Project(50321402) supported by the National Natural Science Foundation of China; project (2004CB619204) supported by the National Key Fundamental Research and Development Program of China     

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

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

硫氰酸盐法从高铜硫化金矿中浸取金银的研究

本文对含高钢硫化浮选精金矿，采用新的硫氰酸盐法浸取金银，对影响浸取金的因素进行了仔细的研究，并与传统的氰化法做了比较，结果表明此法对难处理的高铜金矿有较高的浸取率，浸取速度快，浸取剂性质稳定，基本上不污染环境，是一个很有前途的提金方法。     

Influencing factors of pyrite leaching in germ-free system

The effect of mineral particle size, pulp potential and category of oxidant on pyrite leaching was studied. The results show that a smaller mineral particle size leads to a higher leaching rate of pyrite, and the optimum result with pyrite leaching rate of 2.92% is obtained when mineral particle size is less than 0.037 mm. The pulp potential reflects the leaching process. The increase of pulp potential can improve pyrite leaching. The leaching rate and velocity of pyrite can be enhanced rapidly by adding strong oxidant. The kind and the method of adding oxidant have important effect on the pyrite leaching. Appropriate concentration of Fe3 can enhance pyrite leaching but the precipitation generated by high concentration of ferric ion covers the surface of pyrites and prevents the leaching process. The leaching rate increases with the constant addition of H2O2.     

用353E树脂回收氰化镀金废液中的金

353E树脂是大孔双官能团阴离子交换树脂,对金具有良好的吸附性能,氰化镀金废液中的金是以Au(CN)~-_2配离子形式存在,为了回收镀金废液中的金,我们选用了353E树脂吸附法,研究了金的吸附条件,解吸条件,还原分法以及交换柱的放大实验等,为进一步工业回收提供了实验依据。     

大孔树脂分离纯化女贞子中齐墩果酸工艺的研究

本文对大孔吸附树脂分离纯化女贞子中齐墩果酸的方法进行优化研究.以齐墩果酸的吸附率和解吸附率为考察指标,筛选出D101、D201、LSD001、XDA-7、C008、LSA-10、LSA-40、LSA-21等8种树脂中最适合齐墩果酸分离的树脂,并确定其分离纯化女贞子中齐墩果酸的最佳工艺条件.结果最优树脂为LSA-21型,最佳工艺条件为女贞子溶液浓度为4.0mg/mL,吸附流速为3mL/min,上样量2BV,洗脱剂为无水乙醇,解吸流速为3mL/min,洗脱剂用量为1.5BV.洗脱液经浓缩重结晶得结晶,经与齐墩果酸对照品进行TLC检查及熔点测定,确定其为齐墩果酸.     

硫酸渣成球性能研究

对硫酸渣成球性能进行了研究.对硫酸渣磨矿后,其粒度和成球性能得到很大的改善.通过对硫酸渣球团的落下强度、抗压强度和生球爆裂温度等进行测定,得出在粒度水平（74μm/95.1%）及膨润土为1.0%条件下,硫酸渣的成球性能较好,能够满足冶金工艺的要求.     

Influence of copper minerals on cyanide leaching of gold

Ｔｈｅｒｅａｒｅｓｏｍｅｒｅｐｏｒｔｓａｂｏｕｔｔｈｅｉｎｆｌｕｅｎｃｅｏｆｃｏｐｐｅｒｏｎｇｏｌｄｃｙａｎｉｄａｔｉｏｎ[1 2 ] .Ｉｔｉｓｇｅｎｅｒａｌｌｙｃｏｎｓｉｄｅｒｅｄｔｈａｔｃｏｐｐｅｒｍｉｎｅｒａｌｓｂｒｉｎｇａｂｏｕｔｎｅｇａ ｔｉｖｅｅｆｆｅｃｔｓｏｎｃｙａｎｉｄｅｌｅａｃｈｉｎｇｏｆｇｏｌｄ .Ｈｏｗｅｖｅｒ,ａｌｏｔｏｆｆｉｅｌｄｐｒａｃｔｉｃｅｓａｒｅｎｏｔｉｎｃｏｍｐｌｅｔｅａｇｒｅｅ ｍｅｎｔｗｉｔｈｓｕｃｈａｃｏｎｃｌｕｓｉｏｎ .Ｉｔｉｓｏｆｔｅｎｔｈｅｃａｓｅｆｏｒｓｏ…     

Pretreatment and thiosulfate leaching of refractory gold-bearing arsenosulfide concentrates

A hydrometallurgical process for refractory gold-bearing arsenosulfide concentrates at ambient temperature and pressure was presented, including fine grinding with intensified alkali-leaching （FGIAL）, enhanced agitation alkali-leaching （EAAL）, thiosulfate leaching and displacement. Experimental results on a refractory gold concentrate showed that the total consumption of NaOH in alkaline leaching is only 41% of those theoretically calculated under the conditions of full oxidization for the same amount of arse- nides and sulfides transformed into arsenates and sulfates, and 72.3% of gold is synchro-dissoluted by thiosulfate self-generated during alkaline leaching. After alkaline leaching, thiosulfate leaching was carried out for 24 h. The dissolution of gold is increased to 91.9% from 4.6% by cyanide without the pretreatment. The displacement of gold by zinc powder in the solution gets to 99.2%. Due to an amount of thiosulfate self-generated during alkaline leaching, the reagent addition in thiosulfate leaching afterwards is lower than the normal.