The product contains three types: under-fired product, over-fired product, and activated magnesia. The following editor will introduce you to the three states of magnesia.
1. The so-called under-burned products are part of the magnesium carbonate that does not form magnesia. If there are too many under-burned products, the burning vector will be high. The magnesite products made of light burned magnesia powder will condense very fast, which will cause the Magnesium products burst, deform, etc. 2. The over-fired product is the over-fired magnesia. If there are many over-fired products, it will not be easy to solidify when it is combined with magnesium chloride to produce oxychloride cement, which is what people often say does not reflect and does not condense. 3. The last one is that the industry of active magnesium oxide as building materials mainly requires the content of active magnesium oxide. If the content of active magnesium oxide is not enough, it cannot fully reflect the chloride ions in the magnesium chloride. After the magnesite product is formed, anti-alkali and anti-halogen will occur The phenomenon.
First of all, magnesium oxide itself is non-toxic and tasteless, but because it belongs to dust, front-line workers should pay attention to dust during long-term work to avoid "pulmonary disease". In addition, magnesium oxide powder and talc powder are commonly used lubricants for athletes and are harmless to the human body. Magnesium oxide can also be used as an antacid, a laxative, to neutralize gastric acid. The neutralizing effect of gastric acid is faster, stronger, and lasting, without producing carbon dioxide, and protecting the ulcer surface.
In summary, we know that magnesium oxide is not harmful to the body, so everyone can use it with confidence.
1. In the stock of magnesium oxide, take out 100 grams of magnesium oxide samples from different corners and different locations (not less than 3), and mix them evenly.
2. Accurately weigh 100g of magnesium oxide powder from the mixed powder and place it in a constant-weight dry beaker, and add 400g of pure water to make it completely wet.
3. Put the cup in a drying oven with adjusted temperature (110°C) and bake for more than 2 hours, and then adjust the oven to 150°C to dry the sample to a constant weight. Activity calculation method: active content of magnesium oxide = [(W-100)/45] X100% where 100 is the weight of the sample before hydration; W is the weight of the sample after hydration; 45 is the conversion factor. Note: In order to obtain a more accurate value, you can take 3 copies of 100g magnesium oxide assay, add the obtained active content value, and then divide by 3.
Points to note: ①During the heating process, avoid the slurry from splashing out of the beaker; ②The drying time should be as long as possible to ensure that the moisture completely evaporates.