This method is applicable to the determination of cerium dioxide in cerium tungsten rods for argon arc welding and plasma arc electrodes, cerium tungsten wires for electric vacuum, and cerium tungsten powder and cerium tungsten blocks during their production. SJ 1590-1980 Analysis method for cerium oxide in cerium tungsten powder, blocks, and rods SJ1590-1980 standard download decompression password: www.bzxz.net
This method is applicable to the determination of cerium dioxide in cerium tungsten rods for argon arc welding and plasma arc electrodes, cerium tungsten wires for electric vacuum, and cerium tungsten powder and cerium tungsten blocks during their production.

Standard of the Fourth Machinery Industry Department of the People's Republic of China
Analysis method of cerium oxide in tungsten powder, block and rod 5J1590-80
SI1590-80
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Standard of the Fourth Machinery Industry Department of the People's Republic of China
Analysis method of cerium oxide in tungsten powder, block and rod 1. General
SJ159080
1.1. This method is used for the determination of cerium dioxide in tungsten wire and tungsten blocks in the production process of arc protection and plasma spot electrodes, rods and electric vacuum wires. 1.2. Before analysis, the tungsten is boiled with 30% sodium carbonate for 1 hour. ~2 hours, remove the surface of the milky lotion to make it shiny, rinse with water for 100 times, and then dry at 105-110℃. The rods and blocks must be ground into powder with a hard alloy grinder before they can be used for analysis.
1.3. The reagents used in the analysis are not lower than the analytical dead weight (secondary). 1.4. The water used in the analysis is distilled water or water of equal absolute value. 2. Determination of cerium oxide
2.1, Method: The sample is treated with potassium fluoride and nitric acid to completely dissolve, and then react with hydrofluoric acid to form a fluoride (containing crystal water) precipitate. After separation, it is precipitated at 800-000℃ in the form of carbon dioxide.
2.2. Required reagents:
(1) 40% fluoric acid
(2) 1:42 nitric acid
2. 3. Determination method: Weigh 2 grams of sample (accuracy is ± 0.0002 grams) and place it in a 250 ml plastic beaker (or platinum beaker), add 30 ml hydrochloric acid, then add nitric acid dropwise until the sample is completely dissolved (no obvious black bag is seen at the bottom), move it to a water bath (place it on an asbestos net) and heat it to dissolve the sample completely and make the precipitate denser, then filter it with dense filter paper (or medium-density filter paper with a little pulp), wash the precipitate with cold water until it is nearly neutral, move the precipitate together with the filter paper into a constant weight material, ash it with a low fire, and then transfer it to a muffle furnace at 800-e00 and burn it for 1-2 hours, take it out and dry it. Cool in the cover for 30 minutes and weigh. The content of Cl2 is calculated according to the following formula: Where: Weight of the precipitate after calcination, g. G--weight of the sample, g. Note: ① The precipitate must be washed with water until neutral, otherwise the separation will not be clear, resulting in a high result. ① This method is applicable to samples containing more than Cl2:1 in chicken. The precipitate after calcination is decomposed by heating with concentrated sodium hydroxide and overloaded oxygen, and the precipitate is determined by the ferrous sulfate concentration method. The results are similar to those of this weight method.
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