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钨酸书籍

钨酸(YS/T 692-2009)

本标准规定了钨酸的要求、试验方法、试验规则、标志、包装、运输、贮存及订货单（或合同）内容。本标准适用于催化剂、印染助剂、润滑剂，以及塑料工业和陶瓷工业等用的钨酸。

贵金属合金元素分析方法钨量和铼量的测定钨酸重量法和硫脲分光光度法(YS/T 372.17-2006)

将试料（6.1）置于250 mL烧杯中，加入10 mL硝酸（3.2）、30 mL盐酸（3.1），盖上表面皿，低温加热溶解。溶解时，按以上比例反复添加硝酸（3.2）和盐酸（3.1）直至完全溶解（可用玻璃棒捣碎沉淀看其是否溶解完全）。蒸发至约10 mL，取下，冷至室温，用水冲洗表面皿及烧杯壁，加水至30 mL，用双层致密无灰滤纸过滤（第一层滤纸紧贴漏斗壁，第二层滤纸的半径比第一层小约0.7 cm，加溶液不能超过第二层滤纸高度的五分之四），用硝酸溶液（3.5）洗涤烧杯5次，每次5 mL～6 mL，并用带橡皮头玻璃棒擦洗烧杯壁，把沉淀转入漏斗中，继续用硝酸溶液（3.5）洗涤沉淀至无氯离子（用硝酸银溶液检验）。

GB/T 6150.1-2008 钨精矿化学分析方法　三氧化钨量的测定　钨酸铵灼烧重量法

钨精矿化学分析方法　三氧化钨量的测定　钨酸铵灼烧重量法，标准英文名称：Methods for chemical analysis of tungsten concentrates—Determination of tungsten trioxide content—The ammonium tungstate igniting gravimetric method。

贵金属合金化学分析方法 铂合金中钨量的测定 三氧化钨重量法(GB/T 15072.17-2008)

《贵金属合金化学分析方法 铂合金中钨量的测定 三氧化钨重量法(GB/T 15072.17-2008)》主要变动有：名称变更；按新标准编写的要求对溶液的配制、浓度的表示等进行了修订；将原标准范围PtW8、PtW8.5修改为本标准适用于PtW合金中钨含量的测定；按照GB／T 20001.4－2001格式要求重新编写。

Articles on Tungsten Compounds, Including: Tungsten Carbide, Tungsten Hexafluoride, Tungsten Trioxide, Tungsten(iii) Oxide, Tungstic Acid, Sodium Tungstate, Silicotungstic Acid, Phosphotungstic Acid, Tungsten Hexachloride

Hephaestus Books represents a new publishing paradigm, allowing disparate content sources to be curated into cohesive, relevant, and informative books. To date, this content has been curated from Wikipedia articles and images under Creative Commons licensing, although as Hephaestus Books continues to increase in scope and dimension, more licensed and public domain content is being added. We believe books such as this represent a new and exciting lexicon in the sharing of human knowledge. This particular book is a collaboration focused on Tungsten compounds.More info: Tungsten, also known as wolfram, is a chemical element with the chemical symbol W and atomic number 74. A steel-gray metal under standard conditions when uncombined, tungsten is found naturally on Earth only combined in chemical compounds. Its important ores include wolframite and scheelite. The free element is remarkable for its robust physical properties, especially the fact that it has the highest melting point of all the non-alloyed metals and the second highest of all the elements after carbon. Also remarkable is its very high density of 19.3 times that of water. This density is slightly more than that of uranium and 71% more than that of lead. Tungsten with minor amounts of impurities is often brittle and hard, making it difficult to work. However, very pure tungsten is more ductile, and can be cut with a hacksaw.