查询词典 precipitation

In concentrated solution of cobalt salt precipitation system, the effects of reagents of ammonia carbonate and ammonium oxalate was studied respectively.

溶液中NH4+的加入，在高 pH值条件下，存在钻氨的络合反应和钻的沉淀反应，草酸钻仍保持针状形貌：在低pH值条件下，随着NH4十加入量的增多，草酸钻形貌变得粗短，长径比、粒度减小；最后呈方形，松装比重增加。

Red phosphor Al2O3:Eu was prepared by co-precipitation method using mixture of ammonium hydrogen carbonate and ammonium water as complex precipitator.

用碳酸氢铵和氨水混合溶液作为复合沉淀剂制备了Al2O3：Eu 红色荧光粉体。

The feasibility of the treatment of phosphate wastewater by the magnesium ammonium phosphate precipitation process was discussed.

探讨了磷酸铵镁沉淀法处理磷酸盐工业废水的可行性。

College of Science, Chongqing Jiaotong UniversityThe feasibility of the treatment of phosphate wastewater by the magnesium ammonium phosphate precipitation process was discussed.

探讨了磷酸铵镁沉淀法处理磷酸盐工业废水的可行性。

Some factors affecting the result of removal of ammonium and phosphate, such as pH, molar ratio, reaction time,stirring speed,precipitation time were discussed.

研究了pH值、反应物摩尔比、搅拌速度、反应时间、陈化时间等因素对磷酸盐去除效果和氨氮残留量的影响。

The product enjoys unique electrostatic precipitation design, and can achieve high efficient catching of dust, pollen, mold, dust mite, anaphylactogen and smoke in the air, with evident purification effects.

能快速、有效的电解空气中的烟尘等，瞬间去除屋内异味、烟臭味、室内污染空气迅速转化成新鲜清净的空气，尤其适合会议室、卧室内去除烟尘。

The nanophase anatase of different size (the average is 40 nm) was synthesized with chemical precipitation method.

采用化学沉淀法制备出 40nm的锐钛矿，并用拉曼光谱对纳米和块体锐钛矿到金红石的相转变过程进行了研究。

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。

Under the circumstances , gypsum or anhydrite could accumulate to form beds many meters thick, without any co-precipitation of halite

在这种环境下，石膏或硬石膏可以堆积成许多米厚的岩层，而没有任何石盐伴生沉淀。

Under the circumstances, gypsum or anhydrite could accumulate to form beds m any meters thick, without any co-precipitation of halite

在这种环境下，石膏或硬石膏可以堆积成许多米厚的岩层，而没有任何石盐伴生沉淀。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。