Magnesium oxide is widely used in daily life. It plays an important role in the production of some raw materials in industry. When purchasing magnesium oxide, it is necessary to test the activity of magnesium oxide. For raw materials, if the activity of magnesium oxide is not enough, it will easily lead to the quality of materials not up to the standard, so its activity is very important. Then how to test it? Xiaobian will introduce it to you. Taking magnesium oxide for adhesive as an example, I would like to explain it to you. I hope it will be helpful to you.

In the stock of magnesia, 100 grams of magnesia samples are taken from different corners and locations (no less than 3 places) and blended evenly. Accurately weigh 100g magnesia powder from the mixed powder and place it in a constant weight drying beaker. Add 400 g pure water to make it completely wet. Put the cup in the oven with adjustable temperature (110 C). Bake for more than 2 hours. Then set the oven to 150 C and dry the sample to constant weight. Activity calculation method: the active content of magnesium oxide=[W-100)/45]100% formula 100 is the weight of sample before hydration; W is the weight of sample after hydration; 45 is the conversion coefficient. Note: In order to obtain more accurate values, three samples of 100g magnesium oxide can be tested, and the final active content is added up, then divided by 3.

In the detection of magnesium oxide activity, we should pay attention to the problem of avoiding slurry splashing out beaker during the heating process, and drying time as long as possible to ensure the complete evaporation of water.