答：先要精选，再制砂后，经磁选、浮选或化学提纯后，二氧化硅能达到95%。
Answer: want first choice, remaking sand, through the magnetic separation, flotation or chemical purification, silica be 95 percent.
作为一种化学原料，它也被用于制造杀虫剂、提纯水、净化污水和制氨。
As a chemical it's also used in insecticides, water purification, sewage treatment and the production of ammonia.
如果你在做有机化学，想要提纯一些东西，这是很痛苦的？
If you're doing organic chemistry, and you're trying to purify things, this is a real pain, right?
到目前为止，他们刚刚对200种青蛙的皮肤分泌物进行了提纯并确定化学结构，因此还有一个大量的抗生素的宝藏有待发掘。
So far, they have purified and determined the chemical structure of barely 200, leaving a potential bonanza of antibiotic substances awaiting discovery.
根据人造金刚石合成棒中各组分不同的物理、化学性质，提出了一种采用气相氧化法提纯人造金刚石的新工艺。
Based on different physical and chemical properties of components in synthetic rod, a new purification process for synthetic diamond by gas phase oxidation method is proposed.
引用水可以从废弃物提纯出来和用化学方法处理，因此它能够再利用。
The used water can be separated from waste matter and treated with chemicals so that it can be reused.
环烷酸的提纯方法主要有物理方法和化学方法。
The methods of purification for naphthenic acid consist of physical method and chemical method.
作者观察了采用化学消化、机械分离和离心提纯法制备的胰腺腺泡的机能。
The functional character of dispersed pancreatic acini prepared by the method including chemical digestion, mechanical isolation and centrifugal purification was studied.
在5.32这门课程中，实验内容也牵涉到？的提纯，表征，测定以及有机和生物化学合成过程中的分子建模问题。
In 5.32, experiments also involve enzyme purification, characterization and assays, as well as molecular modeling in organic synthesis and in biochemical systems.
在纳电子器件的制备过程中，碳纳米管的提纯和化学修饰是一个很重要的处理步骤。
In the fabrication process, it is a crucial step to purify and modify the carbon nanotubes.
本文还首次对电化学脱氧提纯稀土金属钇的基本原理和热力学过程进行了论证。
In this paper, basic principle and thermodynamic process of the electrochemical deoxidation purified rare earth metal yttrium are firstly demonstrated.
细菌纤维素的改性方法包括细菌发酵时的生物改性及纤维素提纯之后的化学改性。
Modification of bacterial cellulose includes bio-modification during fermentation and chemical modification after purification.
对二氧化硅溶胶进行酸处理后再提纯，可以大大加速提纯过程并消除氨水对二氧化硅粒子化学稳定性的影响。
The purification of silica sols was accelerated after acidification, and the influence of ammonia on chemical stability of silica particles was eliminated.
基元谱与提纯化学物质谱的相关分析印证了组织形态基元谱的来源。
The correlation analysis showed that the spectrum from a morphological element is highly correlated with that from the corresponding purified chemical.
作者论述了蔗糖酯的各种化学合成、分离提纯方法及其研究进展。
This study investigates the various approaches in chemical synthetic as well as purification and developments of re - Search.
采用改进的湿化学方法提纯多壁碳纳米管。
Multi-walled carbon nanotubes are purified by an improved wet-chemical method.
磷酸二氢钾、酸铵提纯，包装材料、工产品(含化学危险品)售。
Linsuanerqingjia, ammonium sulfate purification, packaging materials, chemical products (excluding hazardous chemicals) sales.
磷酸二氢钾、酸铵提纯，包装材料、工产品(含化学危险品)售。
Linsuanerqingjia, ammonium sulfate purification, packaging materials, chemical products (excluding hazardous chemicals) sales.
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