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湘乡市东山天然饮用矿泉水,是我省首次发现的大型含锌矿泉。它发育在北东向东台山含水断层带上,该断层长60km以上,倾向北西,斜贯湘乡境内,向西南通过歇马花岗岩体。在泉区,沿断层带发育一条硅化破碎带,最厚处达150m。断层上盘为白垩—第三系红层,下盘为板溪群,均为不透水层,对矿泉起遮挡保护作用。本矿泉水量丰富,每昼夜可取水2000t。泉水中锌和偏硅酸含量,已达到国家天然饮用矿泉水标准,另含10种人体必需的微量元素,属少见的优质矿泉。 相似文献
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为了提高随钻电磁波测井仪器的抗震能力,仪器传感器中所有发射与接收线圈均安装在柱状金属钻铤上的环状刻槽中,同时槽中充填高磁导率的铁氧体,以提高发射和接收效率.本文针对多环状刻槽钻铤中发射与接收线圈分布,研究建立一套随钻电磁响应的混合模拟算法.首先,根据环状刻槽几何尺寸以及轴向边界,将整个钻铤与外部的井眼和地层划分成多个不同电导率和磁导率分布的轴对称非均质各向同性层状模型,并应用混合法建立层状非均质地层中电磁场的半解析解与各个线圈上感应电动势的计算方法.其次,利用摄动原理给出随钻电磁测井中振幅比与相位差的空间灵敏度计算公式.然后,通过数值结果考察铁氧体磁导率和地层电导率变化对发射线圈的发射功率和接收线圈上感应电动势的影响,并确定各个接收线圈上感应电动势的动态变化范围,为仪器设计过程中选择合适的铁氧体提供理论依据.最后,通过空间灵敏度分布特征考察振幅比与相位差在探测特征上的差异. 相似文献
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Influence of the Temperature on the Formation of Magnetite as an Additive for Magnetic Separation To investigate the influence of the temperature on the formation of magnetite in aqueous solution, experiments were performed in which ferrous hydroxide was precipitated from oxygen-free ferrous sulfate solution (c0(Fe) = 5 mmol·dm?3) and subsequently oxidized with synthetic air. The precipitates so obtained are a mixture of solids whose compositions depend on the temperature and on the rate of aeration. Above all, magnetite, goethite, and δ-FeOOH had been formed. Magnetite occurs at temperatures above about 15 °C, goethite above 35 °C, and δ-FeOOH below about 10 °C. Referring to the thermogravimetric plots and to the relationship between the temperature of formation and the pH measured upon completion of the reaction, it is justified to assume that also sulfate is contained in the precipitates. The values of the magnetic moment of the precipitates, which are crucial in magnetic separation, made evident the dependence on the temperature of formation expected on the basis of solid analyses and confirmed the presence of δ-FeOOH at rather low temperatures. At the rates of aeration applied, it was possible to obtain from about 15 °C on solids having magnetic moments which are sufficient for magnetic separation. 相似文献
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Conditions of the Formation of Zinc-bearing Ferrites in Regard of Heavy Metal Removal from Wastewater by Magnetic Separation Magnetic separation techniques can be applied for heavy metal removal from wastewater if it is reached to link together the heavy metals with a substance which is sufficiently influenced by a magnetic field. Such a substance is the ferrimagnetic magnetite which can be prepared under special conditions – by oxidation of ferrous hydroxide – in wastewater. In this paper, zinc was chosen as an example for technically relevant, diamagnetic heavy metals. The investigations deal with the influence of zinc onto the structure and the magnetic properties of the reaction products produced by oxidation of zink-bearing ferrous hydroxide in aqueous solutions at room temperature. The oxidation was caused by synthetic air passing through the suspension. During the reaction, the parameters pH value, redox potential, and concentration of dissolved oxygen were observed continuously. The plots of these parameters versus time yield typical courses which can be used as measurement for the progress of the reaction. The results show that magnet ite can only be prepared if the molar ferrous concentration at the beginning is four times higher than the concentration of the dissolved oxygen. Furthermore, the oxidation rate must be slow, a condition which could be achieved by mass transfer controlled kinetics. The products of the oxidation of zinc-bearing ferrous hydroxide show a colour between black and brown. They consist of magnetite, zinc-bearing ferrite and amorphous iron hydroxide. It can be observed that with increasing initial zinc concentrations, increasing amounts of zinc-bearing ferrite but also of amorphous iron hydroxide are produced. Therefore, it seems that the impact of zinc on the reaction is in such a way that more amorphous compounds instead of the thermodynamically stabile ferrite are formed; The magnetic properties show also a dependence on the initial zinc concentration: The saturation magnetization decreases with an increase of the zinc concentration. The reaction product which results from the experiment with an initial mole ratio of Zn:Fe = 1:1 points out only paramagnetic behaviour. 相似文献
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