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在中南钨矿系统方面的矿石分析中,钨为其主要对象,在钨的分析中又以钨比色法为最多,因而在钨比色法中所存在的元素干扰问题,是值得注意并且是急待解决的问题。用二氯化锡还原及硫氰络合离子显色的钨比色法中,干扰的元素当然很多,只要在色液中能生色或成沉淀的均有干扰。就中南钨矿和一般矿石来说,根据各地反映和个人几年工作中经常碰到的干扰元素是砷、钼和铜。在用二氯化锡作还原剂的显色液中,砷成棕色以至黑色的元素砷沉淀,铜成白色的硫氰化亚铜沉淀,而钼成棕红色的硫氰化物留于溶液中;因而这些元素的存在,将使色液浑浊和极不正常,严重地影响比色工作的进行。近年来各单位对于干扰元素的除去多已作了不少的努力,也试验研究过许多方法,但是就工作要求来说都很难令人满意。因此作者就自己几年来关于对这方面工作上的一些体会,提出来互相研究,以期共同提高,达到改进工作的目的。现分别叙述如下:
In the ore analysis of the Zhongnan tungsten system, tungsten is the main target. In the analysis of tungsten, the tungsten colorimetric method is the most. Therefore, the element interference problem in the tungsten colorimetric method is worth noting that Urgent problem to be solved. With tin dichloride reduction and thiocyanate complex ion color tungsten colorimetric method, of course, a lot of interference elements, as long as the color liquid can be chromogenic or precipitation have interference. In the case of Zhongnan tungsten ore and general ore, arsenic, molybdenum and copper are the most frequently encountered disturbing elements that are reflected in various localities and years of work by individuals. In the chromogenic solution with tin dichloride as reductant, arsenic is precipitated as a brown to black elemental arsenic, copper is precipitated as white copper thiacylate while the reddish molybdenum is left as a solution in solution; Therefore, the existence of these elements, will make the liquid turbid and very abnormal, seriously affecting the colorimetric work. In recent years, various units have done a lot of work on removing interfering elements. Many methods have also been experimentally studied, but they are difficult to satisfy in terms of work requirements. Therefore, the author puts forward some research on each other’s experience in his work in this area over the past few years in order to jointly improve and achieve the goal of improving his work. Now are described as follows: