铁屑微电解法深度处理医院废水     

邹红林  陈恩鉴  许汇娟 《广东海洋大学学报》2002,22(6):45-48

用铁屑微电池原理深度处理了医院废水 ,分析了废水pH、铁屑用量、反应时间对处理效果的影响。结果表明 ,最佳的反应条件为 :废水进水pH为 3.5 ,铁屑用量为 12 .5 % ,常温反应 80min。  相似文献   

Usefulness of geological,mineralogical, chemical and chemometric analytical techniques in exploitation and profitability studies of iron mines and their associated elements     

M. Dolores Petit-Dominguez  M. Isabel Rucandio  Almudena Galan-Saulnier  Rosario Garcia-Gimenez 《Journal of Geochemical Exploration》2008

Due to the high number of variables involved in mine profitability studies, it is often very difficult to establish connections among them in order to provide a blend of market saleable quality products. In this sense, analytical chemistry together with chemometry are essential and indispensable disciplines to tackle these studies. The aim of this work was to demonstrate the utility of these disciplines to carry out optimization studies of iron mines. For this purpose, one of the most important iron mines of the Iberian Peninsula was chosen, sited in the mountain range of Sierra Menera, near the location of Ojos Negros (Teruel, Spain). Geological, mineralogical and chemical composition of 148 samples was analyzed, corresponding to different depths of three drill holes (named TE1, TE2 and TE3). In particular, aspects concerning to chemical composition are very important, since the mean contents of certain elements, such as phosphorus, sodium and potassium, should be restricted to the established limits to prevent that companies can drive back the raw material if they do not fulfil the necessary requirements. On the other hand, the large number of analysed samples drove us to use a statistical processing of the data. Among other aspects, it provides a way to find possible connections among a high number of variables and classify samples into compositional groups sharing similar composition, in order to limit the mineralised area and to obtain enough information about the amount of those chemical elements associated to iron ores. Data obtained from all these analytical techniques were in good agreement and provide a methodology that can be of wide interest applied to different geological studies.  相似文献   

土壤中氟的形态分析   总被引：11，自引：3，他引：8  

桂建业  韩占涛  张向阳  刘福亮 《岩矿测试》2008,27(4):284-286

以宁夏盐池地区高氟土壤为例,采用连续提取法对土壤样品中各形态氟进行提取,离子色谱法测定各形态氟的含量。根据研究目的及土壤特点将氟的形态划分为水溶态、离子交换态、可还原态、可氧化态及残渣态5种形态;对各种形态连续提取过程中使用的提取液进行了选择。采用建立的方法获得提取土壤中F-的检出限为0.76μg/g;方法精密度(RSD,n=7)各形态氟为水溶态氟11.3%,离子交换态氟13.5%,可还原态氟10.7%,可氧化态氟8.9%。  相似文献   

江西省德兴铜矿矿区重金属元素的环境效应   总被引：6，自引：0，他引：6  

初娜  赵元艺  张光弟  杨慧 《地质学报》2008,82(4):562-576

本文系统研究了德兴铜矿排石场和尾砂库的环境问题,以环境介质（水土植物）中重金属元素含量为研究对象,论述矿区重金属的环境效应。研究结果表明祝家村低品位矿石堆浸场淋滤产生的酸性废水是造成大坞河流域重金属污染的主要来源。大坞河上游水体中Cu元素含量高达14506μg/L,是国家Ⅲ级水标准的14倍之多,Zn元素含量高达2938μg/L,是国家Ⅲ级水标准的2.9倍,同时pH值在3~4范围内;到中下游水体中Cu元素含量减小到几千到几百μg/L,水质有所改善。大坞河沿岸上游和中游土壤重金属含量受河水影响,随着与河岸距离的增加而减小。同时水稻中Pb元素含量是国家粮食标准的2倍。推测4#尾砂库尾砂表层氧化带深度大于80cm;而1#尾砂库库内尾砂中氧化带估计在0~25cm处。推测两个尾砂库产酸能力小于酸中和能力,故坝底水中pH值在7左右,对周围水体影响较小。与4#尾砂库距离近的石墩头村稻田表层土壤中Cu、Mo元素含量较高,远离尾砂库土壤中重金属含量降低。同时4#尾砂库周围土壤中Cd、Pb、Cu元素的吸附态、碳酸盐态比例在20%左右,因而在酸性环境下较容易被植物吸收。1#尾砂库矿建村种植的小白菜中Pb元素含量超过国家蔬菜标准的4倍,Cu、Pb、Zn元素含量严重超过背景值。  相似文献   

滇西沘江流域水体中重金属元素的地球化学特征   总被引：6，自引：1，他引：5  

李瑞萍  王安建  曹殿华  王高尚  李以科  耿诺 《地质通报》2008,27(7):1071-1078

通过测定流经兰坪金顸铅锌矿区的沘江水体中Pb、Zn、Cd、As的含量和底泥中重金属元素的化学形态的含量,分析了重金属元素的分布和化学形态的变化。结果表明,沘江水遭到了Cd污染,底泥已经成为重金属元素的蓄积库,以国家土壤环境质量标准（Ⅲ级）衡量,Pb、Zn、Cd和舡分别超标3．4倍、15．8倍、106倍和2．6倍。沘江水中重金属元素含量的峰值在矿山附近的下游,而底泥中重金属元素的峰值在矿山下游30-50km的地方,矿业活动、水流变缓、pH等水体环境条件的变化都能影响水和底泥中重金属元素的含量。底泥中的Pb以碳酸盐结合态为主,Zn和Cd以铁锰氧化物结合态为主,而As以残渣态为主。Pb、Cd、Zn三种元素的环境有效态含量比较高,对沘江流域生态环境具有潜在的巨大的危害。  相似文献   

济宁颜店铁矿地质特征及济宁岩群含矿性研究     

韩玉珍  王世进  李培远 《山东地质》2008,24(2):3-8

伏于济宁滋阳山一带千米盖层之下的古元古代济宁岩群是一套低绿片岩相变质含铁岩系,主要岩石组合为千枚岩、板岩、磁铁石英岩等,其原岩为海相含灰质泥岩、砂岩类中酸性火山岩、硅铁岩等,该套岩系最大控制厚度达580m。其中赋存的条带状磁铁石英岩呈层状、似层状埋深在1612．89～1796．54m之间,共有5层铁矿,总厚度85．53m。估算预测的铁矿资源量（334）9．76亿t,mFe平均品位22．37％;低品位矿体预测的资源量（334）2．64亿t,mFe平均品位16．99％。  相似文献   

东平-汶上铁成矿带西侧低缓磁异常区找矿前景分析          下载免费PDF全文

程龙  杨勇 《山东国土资源》2020,36(9)

梁山东丁庄铁矿位于东平-汶上铁成矿带西侧的低缓磁异常区,为区内新发现的沉积变质型铁矿床。通过1∶1万高精度磁法面积测量工作,在区内圈定3个磁异常,并进行钻探验证,证实其中2个为隐伏磁铁矿体引起,矿体赋存于泰山岩群山草峪组中。通过研究矿体的地质特征、磁异常特征,并与区域铁矿成矿条件对比分析,认为区内矿致磁异常特征一般表现为在数十纳特的平缓背景场基础上,突然升高至数百纳特的相对高值异常,具突变特征。该类异常一般呈NW走向,与东平-汶上铁成矿带走向基本一致,其形态一般呈规则的长条带状、椭圆状或串珠状。区域上存在较多与研究区具有相似特征的低缓磁异常,且具备有利的成矿地层条件,因此认为区域上低缓磁异常区具有较大的找矿潜力,找矿前景良好。  相似文献   

Copper Speciation in a Collection of Geochemical Reference Materials Using Sequential Extraction and Evaluation of the Validity Using XANES Spectroscopy          下载免费PDF全文

Atsuyuki Ohta  Ran Kubota 《Geostandards and Geoanalytical Research》2016,40(1):117-134

Copper speciation in a collection of Japanese geochemical reference materials (JSO‐1, JLk‐1, JSd‐1, ‐2, ‐3 and ‐4, JMs‐1 and JMs‐2) was achieved by sequential extraction and characterised using X‐ray absorption near‐edge structure spectroscopy. In the first step of the extraction, referred to as the acid fraction, between 1% and 20% total Cu within the reference materials was extracted. Such a result is typically accounted for by absorption of Cu onto clay minerals. However, the presence of Cu sulfate (an oxidation product of chalcopyrite) was observed in some of the stream sediments affected by mining activity (JSd‐2 and JSd‐3) instead. Copper was extracted in the reducible fraction (targeting Fe hydroxide and Mn oxide) (2–49% total Cu). Between 2% and 51% Cu was extracted in the oxidised fraction (targeting sulfides and organic matter). X‐ray absorption near‐edge structure spectroscopy clarified that the reducible fraction consisted of Cu bound to Fe hydroxide, whereas the oxidised fraction was a mixture of Cu bound to humic acid (HA) and Cu sulfide. In the oxidisable fraction, chalcopyrite was the predominant species identified in JSd‐2, and Cu bound to HA was the major species identified in JSO‐1 (a soil sample).  相似文献   

云南大红山地区铁、铜矿床类型及形成机理     

李锡康  程胜辉  朱多录  柏杨  孙鹏  郝学峰  李蓉 《地质论评》2016,62(S1):213-214

大红山地区是云南省重要矿集区之一,已发现大红山大型铁铜矿床及东么、底巴都、底戛母、河口、坝达等多个中小型铁铜矿床（点）,区内分布多个磁异常及化探异常,成矿地质条件优越。近年云南省三年地质找矿行动计划项目“云南省新平县大红山外围铁、铜矿资源普查”经过勘查在大红山外围东么、底巴都矿区圈定多个工业铁、铜矿体及超贫磁铁矿体,取得一定找矿新进展。本文根据近年工作中观察到的新现象、取得的新资料,结合前人研究成果,对大红山地区铁、铜矿床成因类型及形成机理进行探讨。  相似文献   

Sulphate reduction in the sediment of the Venice canals (Italy)     

Zaggia L  Rosso J  Zonta R 《Marine pollution bulletin》2007,55(10-12):415-424

The sulphur cycle in the sediment of the Venice canal network was investigated by considering the sulphate reduction rate (SRR) and the distribution of sulphur compounds, in both pore water and sediment. Sulphate reduction (SR) is the main process in the metabolism of the organic matter supplied to the network by untreated urban effluents. Although it might account for the decomposition of only a limited percentage of the total organic-C inputs, the estimated rates are among the highest observed in coastal sediments. Measured rates range from 0.26 to 0.99 micromolcm(-3)d(-1), while mean annual values, estimated by a diagenetic model, vary from 0.16 to 0.43 micromolcm(-3)d(-1). The speciation of S in the sediment reveals that pyrite-S is the most abundant component of the total reduced S pool, whereas acid volatile sulphides and elemental sulphur together account for less than 45%. A preliminary budget indicates that the rate of burial of solid-phase S is small compared to the S produced by SR (from 10 to 25%). A large amount of reduced S is then lost from the canal deposits to be re-oxidised at the sediment-water interface or in the overlying water column.  相似文献