Ferrotungsten typically contains 75%or more tungsten.Silicon is occasionally added as an alloying element to produce ferrotungsten with specific applications,with its content typically ranging from 0.100%to 1.00%.To ensure optimal quality and performance of ferrotungsten,precise control over the tungsten and silicon contents is crucial.The gravimetric method was employed for determining the tungsten and silicon contents in ferrotungsten alloys.The sample was subjected to roasting and oxidation,followed by decomposition with hydrochloric and nitric acids,converting tungsten and silicon into tungstic acid and silicic acid precipitates,respectively,which were then separated from other impurities.The precipitates were ignited to form oxides,which were weighed.Subsequent dissolution of the precipitates with hydrofluoric acid removed silicon,and further ignition and weighing enabled the calculation of silicon content through the mass difference.Potassium carbonate fusion was then used to separate tungsten,and the tungsten content was determined by the mass difference.Experimental results demonstrate that this method exhibits high recovery rates,precision,accuracy,and stability,while being cost-effective and efficient,making it suitable for batch detection of tungsten and silicon in ferrotungsten alloy production.The determination ranges are:tungsten(mass fraction):50%-90%,and silicon(mass fraction):0.100%-1.50%.
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