A: Controllability, the so-called controllability means that after the ore is put into the kiln, the calorific value of the coal can be adjusted by the calorific value and sintering time of the coal, thereby controlling the content of magnesium oxide, different magnesite products. Different amounts of caustic soda are required.
Two: caustic soda is inversely proportional to the amount of magnesium
Three: The setting time of magnesite products, I believe that some friends who know a little about magnesite products know that they have encountered similar problems. The setting time of magnesite products is very fast under certain conditions, sometimes it is On the contrary, there is even a phenomenon of non-coagulation.
When encountering this phenomenon, we must find reasons from two aspects, first: operating temperature; second: caustic soda content of magnesium oxide; third: is Baume, to ensure the effective content of magnesium chloride,
In summer, the temperature is high, the caustic soda content should not exceed 6.5%, not less than 5.5%, and should not be lower than 7 in winter, preferably between 7-10. The content of caustic soda in magnesium oxide is high, and the reaction speed of magnesium oxide is faster. The worse the water resistance, some customers will ask, it wants to solidify faster, the caustic soda control high point does not matter, here to correct, although the caustic soda is high, magnesium products solidify quickly, but if the caustic soda is too high, not only will not solidify fast It is also possible that it will not solidify. The reason is that the powder is too raw, the magnesium content is too low, and the activity is too low, which changes the nature of the original light-burning powder, so that it does not react with the chloride ion in the magnesium chloride.
Some customers will ask, then I want higher magnesium content, caustic soda control low, I want to say that the caustic soda is low, the activity is also low, the calcination time is too long, the magnesium oxide content is high, the activity Magnesium turns into dead magnesium, and chloride ions in magnesium chloride are still unreactive.
Caustic soda should not be too high, nor too low, to achieve the best quality of the national standard. Everything is moderate, and magnesium oxide is no exception.
Silicon oxide determines the color of magnesium oxide, and silicon has a low color difference. There is not much impact on quality, only the appearance is different.
Iron Oxide (FeO) Alumina (AlO): Iron oxide, aluminum is generally a fixed value, the higher the content has an effect on the strength of the later stage of magnesite products, the content is controlled at 1.5%
Calcium Oxide: It will react with sulfate in magnesium chloride to form calcium sulfate, which will increase the volume by 4 times. Within 2%, magnesium oxide with too high calcium oxide will cause deformation and cracking in summer.
Magnesium oxide: content: 85% means that the content of magnesium oxide accounts for 85% of the whole light-burning powder. Among them, magnesium hydroxide and magnesium carbonate have an active content of 65%, which means that it can react with magnesium chloride and water to form magnesite gel. Magnesium oxide accounts for 65%, and magnesium hydroxide, magnesium carbonate, and burnt magnesium oxide do not participate in the reaction.
Magnesium oxide is a magnesia sintered at a temperature above 1000 °C. It loses the voids of the crystal and hardly participates in the reaction. When the content is too high, the hydration reaction is slow, the solidification time is greatly prolonged, and some ore is not good. Doing 85 powder will increase the temperature and burn, resulting in serious burns. It will cause the frost to burn magnesium oxide (magnesium carbonate): the manufacturer has reduced the temperature in order to save the cost, causing the magnesium carbonate not to be burnt through. The performance is too fast, the solidification is fast, the loss of ignition is high, and the product will return. Halogen, deformation. Magnesium hydroxide: It is formed by reacting active magnesium oxide with water in the air. It is characterized by magnesium oxide agglomeration, slow reaction and slow solidification, which will cause frosting and low strength of the product.
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