Characteristics of phosphate adsorption onto granulated coal ash in seawater   总被引：2，自引：0，他引：2  

Satoshi Asaoka  Tamiji Yamamoto 《Marine pollution bulletin》2010,60(8):1188-1192

The deterioration of sediments is a serious environmental problem. Controlling nutrient release fluxes from sediments is important to alleviating eutrophication and to reducing terrigenous nutrient loads. The purpose of this study was to evaluate the phosphate removal performance of granulated coal ash (GCA) from seawater, which is produced from coal thermal electric power generation. Batch experiments were carried out to investigate the removal kinetics of phosphate from seawater under both oxic and anoxic conditions. Phosphate was removed well from seawater under both oxic and anoxic conditions. The adsorption isotherm for phosphate revealed that GCA could remove phosphate effectively from seawater above a concentration of 1.7 μmol L⁻¹. GCA can reduce the concentration of phosphate in seawater effectively under anoxic conditions where iron type adsorbents cannot be applied. Therefore, GCA could potentially be used to adsorb phosphate in the organically-enriched sediment, which generally occurs under highly reductive conditions.  相似文献   

云南白登浅海相磷块岩与青龙哨陆相磷块岩的对比研究     

贺瑾瑞  朱杰勇  周健  洪建磊  李侃  熊亮 《地质与资源》2009,18(4):292-297

白登磷矿是我国重要的浅海相磷块岩矿床,而青龙哨磷矿是我国重要的陆相磷块岩矿床.两地磷矿品位高,储量大,是滇池地区正在开采的2个重要磷矿基地.野外工作研究发现,青龙哨角砾状磷块岩顶板的磷锶铝石矿层和高岭土黏土岩二者呈超覆式不整合接触.深入研究发现其具有陆相磷块岩的许多特征,而没有浅海相磷块岩的原生沉积构造特征.同时,白登磷矿见上下2层工业矿体,而青龙哨磷矿仅见1层工业矿体.对此二矿床特点进行了对比分析.  相似文献   

滇东磷矿多层位控矿地质特征          下载免费PDF全文

常苏娟  朱杰勇  杨永超  孔志岗 《地质找矿论丛》2012,27(2):190-195

滇东磷矿赋矿层位多样,已发现那章组、梅树村组、筇竹寺组、汤池组、红石崖组或湄潭组、牛滚凼组、海口组、东岗岭组、榴江组、法郎组等10个含磷层位.其中,下寒武统梅树村组及中泥盆统东岗岭组工业价值最大,法郎组是最新发现的含磷层位,并在丘北县舍龙村发现了工业矿体.文章简要介绍了上述各含磷层位的分布、岩性特征及代表性矿床,总结了...  相似文献   

胶磷矿晶体结构研究   总被引：1，自引：0，他引：1  

黄小芬  张覃 《矿物学报》2011,31(3):566-570

详细叙述了磷灰石的晶体结构,并采用多种方法对磷灰石结构中配位多面体各元素间的化学键力进行计算,分析了磷灰石的表面特性。针对贵州典型磷矿区具有代表性的胶磷矿试样,其主要由微晶磷灰石组成,采用x射线衍射分析了胶磷矿试样的物相组成、结晶度、晶胞参数以及磷灰石晶粒大小。在扫描电子显微镜下,2种胶磷矿多呈集合体形态,两种胶磷矿中磷酸盐矿物主要为氟磷灰石。  相似文献   

Association of phosphate with rhyolite glass in marine Neogene tuffs from Patagonia,Argentina     

Nora Rubinstein  Ana M. Fazio  Roberto A. Scasso  Steven Carey 《Sedimentology》2013,60(4):1007-1016

The precipitation/replacement of Ca‐phosphate is a complex process that commonly takes place during the early diagenesis in marine sediments. The unusual occurrence of shallow marine, early diagenetic phosphatic deposits associated with glassy tuffs in the Neogene Gaiman Formation, in the Chubut Province, Patagonia, Argentina, constitutes a good case example for the study of replacement and precipitation of Ca‐phosphate on an unstable substrate. Isocon diagrams illustrate that chemical changes during glass diagenesis include gains in loss on ignition and Ca, and losses of K. These changes are the result of glass hydration during sea water–glass interaction, together with adsorption and diffusion of ions into the bulk shard; combined, these represent an incipient process of volcanic glass replacement by Ca‐phosphate. Subsequent early diagenetic P enrichment in the pore solutions led to phosphate precipitation, associated with pitting on the glass shards and pumice. The associated development of a reactive surface promoted the incorporation of P and Ca into their margins. Lastly, precipitation of calcium phosphate filled the vesicles and other open cavities, inhibiting further glass dissolution. The high porosity and reactivity of the volcanic glass provided an appropriate substrate for phosphate precipitation, leading to the development of authigenic apatite concretions in the volcanic‐glass bearing strata of the Gaiman Formation. This research is of significance for those concerned with marine phosphatic deposits and sheds light on the processes of early diagenetic phosphate precipitation by replacement of an atypical, unstable substrate like hydrated volcanic glass.  相似文献   

中国北方磷矿成矿特征及找矿潜力   总被引：1，自引：0，他引：1  

田升平 《化工矿产地质》2000,22(2):65-69

中国北方磷矿在华北、东北以岩浆岩型磷矿和海相沉积型磷矿为主 ,在西北则以海相沉积型磷矿为主。海相沉积型磷块岩矿床主要形成于早寒武世 ,受南面和西面海水侵入影响最大、侵入距离最近的已知含磷地区可作为磷块岩矿床重点研究靶区 ;岩浆岩型磷灰石矿床所赋存的岩体类型比较多 ,但矿床规模较大 ,品位较高 ,具有较大的找矿潜力的磷灰石矿床产于超基性碱性碳酸岩杂岩体中 ,这类杂岩体在我国北方有一定的分布 ,对其做详细工作 ,可望找到规模大、品位高的磷灰石矿床  相似文献   

上扬子区早寒武世黑色页岩磷结核特征及生化淀磷机制   总被引：12，自引：3，他引：9       下载免费PDF全文

雷加锦  李任伟  曹杰 《地质科学》2000,35(3):277-287

通过野外观察、室内化学分析、矿物学分析、硫同位素分析、光学显微镜和扫描电镜观察,发现磷结核内所观察到的许多现象均与微生物的活动有关,微生物是使磷淀积的重要营力,这为磷结核的生物成矿作用提供了有力的证据.沉积物孔隙水物理化学条件的变化直接影响着磷结核的生长过程.  相似文献   

磷酸盐现场自动分析仪化学工艺优化研究   总被引：3，自引：0，他引：3  

袁钟才 《海洋技术学报》2000,19(1):50-60

本文结合营养盐现场自动分析仪的研制,研究了磷酸盐分析所南各种试剂的用量及其作用,重点研究了低浓度磷酸盐的浓度与吸光值之间的关系以及温度对完全反应时间的影响,给出了０．００６～０．１２０ｍｇ／Ｌ范围内ＰＯ４－Ｐ浓度与吸光值的线性函数关系和较合适的完全反应温度,并且提出了现场自动分析仪的两点定标方法。  相似文献   

岩湾矿段风化磷矿形成条件及其三种类型     

陈拥军 《化工矿产地质》1999,21(4):225-230

湖北省鹤峰磷矿走马矿区岩湾矿段风化磷矿是湖北境内首次探明的一中型风化磷矿。矿床成因类型有风化残余型、风化淋滤型、洪积型砂磷矿等三类。在时间上 ,风化淋积型矿体位于风化残余型矿体之下 ,是风化残余型的继承发展。在雨水和洪水冲刷下 ,风化残余磷矿在适当的低洼地带堆积成洪积型砂磷矿。对这种风化矿的勘探应因地制宜 ,灵活运用。对岩湾矿段风化磷矿的成因探讨和勘探研究为东山峰寻找和勘探类似风化磷矿积累了经验。  相似文献   

低浓度磷酸一酯的膜富集和气相色谱测定     

翁建华 Lee.  HB 《水文》1999,33(4):19-21

磷酸一酯（ＲＯ）Ｐ（Ｏ）（ＯＨ）２是一种强极性的有机磷化合物。研究了水体中磷酸一（１－萘）酯的富集和上色谱分析,建立了一个简便快速、高灵敏度、实用的分析方法。富集是采用固相萃取方法,选用载有十八烷基硅烷的尼龙滤膜吸附,甲醇洗脱,回收率达７２％￣７％。它的气相色谱分析选用ＢＳＴＦＡ为衍生剂,反应条件为温度６５℃,反应时间３０ｍｉｎ,获得了满意的结果。方法的最低检测限为０。０６ｎｇ。  相似文献