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Combined determination method for contents of tungsten and silicon in ferrotungsten

A determination method and technology for silicon content, applied in the field of determination, can solve the problems of difficult control of the operation process, cumbersome inspection process, failure of inspection, etc., and achieve the effects of high precision and accuracy of the method, high detection accuracy, and improved efficiency.

Pending Publication Date: 2020-06-19
XINING SPECIAL STEEL +1
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Problems solved by technology

[0005] The purpose of the present invention is to address the defects of the prior art: the original method uses the molybdenum blue photometric method to measure the silicon content in ferro-tungsten, not only the inspection process is cumbersome, but also the operation process is not easy to control, and it is easy to cause inspection failure

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  • Combined determination method for contents of tungsten and silicon in ferrotungsten

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Embodiment 1

[0042] The principle of this embodiment: put the precipitate together with the filter paper in a platinum crucible, burn it at a high temperature of 750°C for 30 minutes in a muffle furnace, take it out, cool slightly, weigh (w1), add 5ml of hydrofluoric acid, add sulfuric acid (1 +1) 2-3 drops, heated on an electric stove, evaporated to the exhaustion of sulfuric acid white smoke, burned in a muffle furnace at 800°C for 20 minutes, took it out, cooled it, and weighed it (w2).

[0043] This embodiment relates to a method for joint determination of tungsten and silicon content in iron tungsten, said method comprising the following steps

[0044] Step 1, preparation of reagents;

[0045] Step 2, the preparation of cinchonine solution;

[0046] Step three, measure;

[0047] Step four, analysis.

[0048] Preferably, in step 1, the reagents include: sodium peroxide, anhydrous sodium carbonate, hydrochloric acid, nitric acid, hydrofluoric acid, sulfuric acid.

[0049] Preferably...

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Abstract

The invention provides a combined determination method for contents of tungsten and silicon in ferrotungsten. The method comprises the following steps of preparing a reagent, preparing a cinchonine solution, and performing measurement and analysis. According to the method, the contents of tungsten and silicon in ferrotungsten can be jointly determined, and through test comparison, the method is rapid, convenient and high in precision and accuracy, is a time-saving and labor-saving test method, and can be suitable for production inspection. Sample sodium peroxide is melted and decomposed, hydrochloric acid acidification and nitric acid oxidation are carried out to generate an insoluble light yellow tungstic acid precipitate, and in order to enable the tungstic acid precipitate to be more completely added with an organic precipitant-cinchonine, the precipitate is filtered, washed, fired and subjected to impurity removal to obtain pure tungsten trioxide, and then the tungsten content is calculated, the contents of the two elements can be detected at the same time, the cost is reduced, the efficiency is improved, and the detection accuracy is high.

Description

technical field [0001] The invention relates to the field of determination methods; in particular, it relates to a combined determination method of tungsten and silicon content in iron tungsten. Background technique [0002] At present, the determination of tungsten content in iron tungsten is determined by cinchonine gravimetric method: Cinchonine gravimetric method for the determination of tungsten content in ferrotungsten GB / T7731.1-1987, the principle: the sample is dissolved with nitric acid, hydrofluoric acid, sulfuric acid, and the solution is evaporated to Take a lot of white smoke, dissolve soluble salts with hydrochloric acid, melt the insoluble residue with sodium carbonate and diboron trioxide, dissolve the melt with hot water, precipitate tungsten with cinchonine α-benzoin oxime, separate, burn, and weigh the impure oxide Melt the substance with sodium carbonate, dissolve the precipitate with hot water, separate, burn, weigh, and the difference between the two m...

Claims

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Application Information

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IPC IPC(8): G01N21/82G01N1/40G01N1/34
CPCG01N21/82G01N1/40G01N1/34G01N2001/4083
Inventor 贾秀美赵海东祁旭丞祁正荣陆建民潘吉珍张俊杰陈万斌云彦青
Owner XINING SPECIAL STEEL
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