查询词典 galena

Meanwhile, the concentration of Pb,Zn and other heavy metals is rather high in the oxidation zone and decreasesdownward to levels that are unbelievably low for Pb-Zn mine tailings. Theseobservations suggest that heavy metals should be re-immobilized by secondaryminerals, rather than primary minerals, in the oxidation zone, and could be leachedout from suboxic environment due to low rate oxidative dissolution which preventsthe precipitation of secondary minerals in significant amount. Thus, cover scenarioswhich establish a suboxic environment beneath the cover layer might not always beeffective in preventing heavy metal release from mine tailings.Sequential extraction studies indicate that, in addition to heavy metal leaching,oxidation of the mine tailings increased the mobility of residual Zn, and Cu, while Pb remains immobile due to the formation of anglesite (PbSO4). Using the seven-step extraction technique developed by Dold (J. Geochem. Explor., 2003, 80: 55-68), galena dissolves in significant amount at step 2 most probably due to the strong complexing of Pb2+ by acetate, while other metal sulfides dissolve at step 6, which suggest that this extraction technique could not be used to evaluate the mobility of lead in natural environment

重金属含量均低于新鲜尾矿，但以硬化层中的含量最高(Pb、Zn含量分别为0.47%和0.93%)，往下大幅度降低，表明尾矿风化过程中形成的次生矿物对Pb、Zn等重金属元素有较强的固定作用，而次氧化带的淋溶作用造成了金属元素的大量流失；(4)与新鲜尾矿相比，硬化层中铅的可迁移性大大降低，硬化层之下尾矿样品中铅的可迁移性也不同程度降低，这是由于硫化物氧化产生的硫酸根与尾矿中的铅反应形成铅矾(PbSO_4)的缘故；(5)氧化作用使尾矿中的zn、Cu等重金属的可迁移性不同程度地增大，其中对锌的可迁移性影响最大，铜的可迁移性与铁比较相似，铅则容易与硫化物氧化形成的SO_4~(2-)反应形成铅矾(PbSO_4)；(6)为了减少尾矿污染和修复矿山环境，人们提出了各种不同的尾矿覆盖方案，本文的研究结果表明，这些方法不一定能够有效地阻滞污染元素的迁移。

The main paragenetic minerales are: uranophane, uranium blacks, autunite, meta-torbernite, microquartz, quartz, ankerite, calcite, fluorite, hydromica, pyrite, galena, sphalerite, and chalcopyrite.

矿化作用共可分为八个阶段，同位素研究结果表明，矿床中的铀主要来自岩浆溶液，部分轴来自围岩——侏罗系长石石英砂岩。沥青铀矿的同位素年龄为108—109百万年。

It should be smooth sailing all the way to Alaska. I'm sending someone out to Galena Base to meet you.

现在可以安稳地向阿拉斯加飞去了，我会派人在Galena接你的。

But in the 1840s, at the height of Galena's prosperity, the town's population was larger than Chicago .

但在19世纪40年代，GALENA市最繁华的时期，该市人口比芝加哥的还多。

As the use of lead declined, so did Galena's fortunes.

随着铅使用的降低，GALENA市的未来使命也降低。

The town is named for Galena, an ore of lead, lead sulfide.

该城市别叫做GALENA，一个储存有铅和硫化铅的矿区。

The kinetics of the dissolution of galena was investigated by monitoring the mixed potential of galena electrode in ferric sulfate solutions.

摘 要：通过动态测量混合电位，研究方铅矿电极在不同浓度的硫酸铁溶液中溶解的动力学过程。

Because of the lack of thermal expansion data of galena and sphalerite and to further examine the applicability of Modified Ruffa Model, galena and sphalerite,minerals with strong covalent characteristics, have been studied in detail.

论文还用修正Ruffa模型对前人没有进行过高温热膨胀实验的方铅矿、闪锌矿的热膨胀系数进行了预测和实验验证。实验所得到的热膨胀系数和计算结果具有较好的一致性。

Galena is located in the "Driftless Zone": an area that was not covered by glaciers during the recent ice ages.

Galena位于Driftless 区：一个在近来的冰川期没有别冰川覆盖的地方。

Galena is a city located in Jo Daviess County, Illinois.

Galena 是位于伊利诺伊州 Jo Daviess市的县。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。