Technological practice of producing tungstic acid using waste catalyst containing tungsten 利用含钨废催化剂生产钨酸工艺实践
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Industrial experience of producing tungstic acid using waste catalyst containing tungsten 利用含钨废催化剂生产钨酸的工业实践
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In 1958 , ganzhou concentration plant was established and started its production . after 1963 , tungstic acid , apt , w powder , wc powder and cemented carbide could be produced too 1958年，赣州精选厂建成投产。 1963年以后，进一步发展到生产钨酸、钨酸钠、仲钨酸铵、钨粉、碳化钨粉、硬质合金等。
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With phosphato - tungstic acid as catalyst and phosphoric acid as dehydrant , n - phenylmaleimide was prepared from aniline and maleic anhydride by two - step method . the yield was 88 . 7 % and the purity was 98 . 2 % 以顺酐和苯胺为原料,磷钨酸作催化剂,磷酸作脱水剂,采用两步法制得n -苯基马来酰亚胺,得到最佳反应工艺条件,产品收率为88 . 7 % ,纯度为98 . 2 % (质量分数) 。
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Abstract : analytical methods for impurities in tungsten and tungstic compounds in recent 10 years were reviewed . among them were atomic emission spectrometry ， atomic absorption spectrometry ， mass spectrometry ， electrochemical analysis ， spectrophotometry and activation analysis . 53 references were cited 文摘:综述了近10多年来钨及其化合物中杂质元素的分析方法，涉及方法包括原子发射光谱法、原子吸收光谱法、分光光度法、质谱法、电化学分析法以及活化分析法等。
