含铜、铋和银的金精矿堆浸工艺综合回收试验研究     

程东会  何江涛  王金祥  李国斌  沈照理 《现代地质》2006,20(2):322-328

采用生物氧化技术和化学方法,利用堆浸工艺分步提取,对含Au 140~150 g/t、Ag 900~1 000 g/t、B i 9.0%~10.0%、Cu14%~17%的多金属浮选金精矿的综合回收工艺进行了研究。经小型搅拌试验,确定了生物氧化浸铜—氰化浸金、NaC l-FeC l3-HC l体系(氯盐法)浸出铋和银的技术方法。通过柱浸试验,研究了利用该方法分步浸取Au、Ag、Cu和B i在堆浸工艺中的可行性。在10 t精矿的扩大试验验中,验证了柱浸试验所取得的工艺指标和参数。试验中掺入骨架材料,解决了精矿在堆浸中的渗透问题;生物氧化过程中,菌种在含高浓度铜离子浸出液中反复驯化,对铜的耐受力提高到30 g/L;在NaC l-FeC l3-HC l体系浸出B i和Ag时,用H2O2将浸出液中的Fe2+氧化成Fe3+,使浸出液能循环使用,且B i和Ag同时浸出。Au、Ag、Cu和B i的最终浸出率分别为92.98%、65.09%、45.33%和53.49%。  相似文献   

Product study of the reaction of OH radicals with isoprene in the atmosphere simulation chamber SAPHIR     

M. Karl  H.-P. Dorn  F. Holland  R. Koppmann  D. Poppe  L. Rupp  A. Schaub  A. Wahner 《Journal of Atmospheric Chemistry》2006,55(2):167-187

Atmospheric oxidation of isoprene and its oxidation products methacrolein (MACR) and methyl vinyl ketone (MVK) have an important impact on the photochemical activity in the boundary layer, in particular in forested areas. The oxidation of isoprene by OH radicals was investigated in chamber experiments conducted under tropospheric conditions in the atmosphere simulation chamber SAPHIR at the Research Center Jülich. The aim was to determine the product yield of MVK and MACR in the OH-induced isoprene oxidation and the rate constant of their reaction with OH under real atmospheric conditions. The recently published updated degradation scheme for isoprene from Geiger et al. (2003) was used to determine rate constants and product yields. The fractional yields in the isoprene peroxy radical reaction with NO were found to be 0.41±0.03 for MVK and 0.27±0.03 for MACR. The rate coefficient for MACR with OH was found to be in very good agreement with the recommended value of IUPAC Atkinson (Atkinson et al., 2005). while the rate coefficient for MVK with OH was 27% lower.  相似文献   

铝片还原-硫酸铁铵容量法测定钛铁矿中高含量     

李锟 《化工矿产地质》2007,29(2):112-114

试样经碱熔,盐酸提取的钛,在以盐酸、硫酸、磷酸组成的强酸性溶液体系中,利用铝片的强还原性,还原四价钛为三价钛。再用三价铁氧化三价钛为四价钛,过量的三价铁离子与硫氢酸根离子生成血红色络合物,根据此原理测定高含量钛。实验证明,溶液在此强酸性体系中,隔绝空气和控制时间的条件下,其含量范围在0.13%～100%内,测定结果准确度高。  相似文献   

郴州华塘煤矿采空区地面塌陷的影响因素及防治措施探讨   总被引：1，自引：0，他引：1  

李守贤  陈荣华  申俊 《地质灾害与环境保护》2007,18(3):19-22

郴州华塘煤矿采空区地面塌陷的影响因素是采矿方法、煤层特征(厚度、产状和埋深)、顶板岩石力学性质、地表水和地下水综合作用的结果.采矿方法的改进和煤柱的留设与保护是防治塌陷的主要措施,监测工作是不可缺少的重要手段.  相似文献   

新疆哈密大南湖地区层间氧化带特征研究     

权志高  张甲民 《地质找矿论丛》2007,22(2):113-117,124

新疆大南湖地区的层间氧化带发育层位为中侏罗统西山窑组第二、三岩性段砂砾岩,以褐黄色为主;层间氧化带具多层性,埋深31～343 m,厚度2～138 m;层间氧化带分为氧化带、氧化-还原过渡带和原生带;铀矿体主产于氧化-还原过渡带中;新构造运动形成的最终构造格架控制了层间氧化带的发育方向和基本形态,不同粒度且非致密结构的砂砾岩和冲积扇相、辫状河相沉积则决定层间氧化带发育的厚度和规模,由南向北流的承压地下水造成区内层间氧化带前锋线呈向北延伸的趋势.  相似文献   

Evaluation of α- and β-pinene degradation in the detailed tropospheric chemistry mechanism,MCM v3.1, using environmental chamber data   总被引：1，自引：0，他引：1  

P. G. Pinho  C. A. Pio  W. P. L. Carter  M. E. Jenkin 《Journal of Atmospheric Chemistry》2007,57(2):171-202

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Evaluation of Electro-Oxidation of Textile Effluent Using Response Surface Methods     

R. Saravanathamizhan  N. Mohan  N. Balasubramanian  V. Ramamurthi  C. Ahmed Basha 《洁净——土壤、空气、水》2007,35(4):355-361

In the present investigation, treatment of textile effluent using an electrochemical technique was designed and analyzed using the Box-Behnken method. The influence of individual parameters on electro-oxidation of textile effluent has been critically examined using the response surface method (RSM), and a quadratic model for chemical oxygen demand (COD) reduction has been developed. It has been observed from the present analysis that the predicted values are in good agreement with experimental data with a correlation coefficient of 0.945.  相似文献   

A comparative mineralogical and geochemical study of sulfide mine tailings at two sites in New Mexico, USA   总被引：5，自引：0，他引：5  

Michelle P. Boulet  A. C. L. Larocque 《Environmental Geology》1998,33(2-3):130-142

A comparative study of sulfide mine tailings from two sites near Silver City in southwest New Mexico has shown the need for environmental monitoring in a geological context. The Cyprus-Piños Altos and Cleveland deposits consist of Cu and Zn skarn mineralization in the Piños Altos Mountains of New Mexico. Primary ore minerals in both deposits include chalcopyrite, sphalerite, and galena. The Cyprus-Piños Altos Mine ceased operation in 1995 and the Cleveland Mill closed in 1950. The deposits have similar mineralogical characteristics; however, the tailings are different in terms of age, degree of oxidation and method of disposal. The Cyprus-Piños Altos tailings (CPAT) are stored in a lined, bermed impoundment. They are dominantly water-saturated and exhibit no secondary-phase formation. The grains are not cemented and show no evidence of primary-mineral dissolution. The geochemical data show a predominantly primary signature. The tailings pond water is neutral to slightly alkaline (pH?from 7 to 8.3), partly as a result of processing methods. The Cleveland mill tailings (CMT) were deposited in a valley at the headwaters of an ephemeral stream. They are highly oxidized and differentially cemented. They have undergone numerous wet/dry cycles resulting in extensive oxidation. Secondary minerals predominate, and consist mainly of jarosite, goethite, hematite, and Fe-oxyhydroxides and -oxyhydroxysulfates. The pH of the stream draining the CMT is as high as 2.15. Maximum metal contents in the stream immediately downstream from the tailings are 5305?ppm Zn, 454?ppm Cu, 1.16?ppm Pb, 17.5?ppm Cd, 1.4?ppm As, and 0.01?ppm Hg.  相似文献   

西藏玉龙铜矿床次生氧化富集作用机制   总被引：8，自引：0，他引：8  

陈建平  王成善 《地质学报》1998,72(2):153-161

作文阐述了西藏玉龙铜矿床成矿过程中的“沉积初步富集期”和“西藏玉龙铜矿床次生氧化成矿作用模式”,这不仅对指导当前生产具有重要的现实意义,而且为在玉龙铜矿带进一步找矿共作劈了新的方向。  相似文献   

松辽盆地西南部层间氧化带砂岩型铀矿找矿方向   总被引：16，自引：1，他引：15  

赵忠华  刘广传  崔长远 《矿物岩石地球化学通报》1998,(3)

松辽盆地西南部层间氧化带砂岩型铀矿找矿方向赵忠华刘广传崔长远（核工业东北地质局２４０研究所,沈阳１１００３２）关键词开鲁盆地层间氧化带砂岩型铀矿找矿松辽盆地西南部系指内蒙古自治区哲里木盟及昭乌达盟所辖地区,西临大兴安岭,南依辽西山地,面积约６００００...  相似文献