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目前钨砂中测定高品位的WO_3,厂矿化验室一般都采用王水法分解矿样,利用辛可宁法或硝酸铵法,都能得到准确的结果,这是优点;但目前大多数化验室通风设备都不完备,而方法本身也近有一定的缺点: 1.用王水分解矿样,在分解过程中,须随时搅拌,以免试样结块於杯底,毒烟弥漫,对工作人员的健康有一定的影响,这是最大的一个缺点。2.王水法分解矿样,特别是钨锰铁矿很难分解完全;用氢氧化铵溶解钨酸後,残渣必须以过氧化钠或氢氧化钠熔融,再以比色法测定微量钨。3.干扰元素的硅,用王水分解矿样时,不易分
Tungsten sand currently measured high grade WO_3, factory mineralization laboratories generally use aqua regia decomposition of mineral samples, the use of cinchinen method or ammonium nitrate method, can get accurate results, which is an advantage; but most of the current laboratory ventilation are not Complete, and the method itself also has certain shortcomings: 1. With aqua regia mineral sample, in the decomposition process, to be stirred at any time, in order to avoid the sample cake in the bottom of the cup, toxic smoke diffuse, there is a certain staff health This is one of the biggest drawbacks. 2 aqua regia decomposition of mineral samples, especially wolframite is difficult to decompose completely; with ammonium hydroxide dissolved tungstic acid, the residue must be sodium or sodium hydroxide melt, and then the determination of trace tungsten colorimetry. 3. Interference elements of silicon, with aqua regia mineral sample, not easy to divide