Light burnt magnesia powder

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The black smoke control of light burning magnesia powder should not be underestimated.

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The black smoke control of light burning magnesia powder should not be underestimated.

Date:2017-08-16 author: click:

Light burnt magnesium powder contains three kinds of substances: underburnt, overburned and activated magnesium oxide.




1: The so-called underfired products are part of magnesium carbonate which does not form magnesium oxide. (Controlling the setting speed of magnesite products mainly depends on the amount of underfired products;) If there are more underfired products, the burning vector will be higher, and the setting speed of magnesite products made is very fast, which will cause the bursting and deformation of magnesite products.



2: The so-called over-burned products are over-burned magnesium oxide (the longer the burned, the higher the content of magnesium oxide, suitable for feed, refractory and other industries). If there are more over-burned products, it will not be easy to solidify when magnesium oxychloride cement is formed with magnesium chloride, that is to say, it is not reflected and does not solidify.



3: The last one is active magnesium oxide (the best part of magnesium oxide). The industry of building materials mainly requires the content of active magnesium oxide. If the content of active magnesium oxide is not enough, it can not fully reflect the phenomenon of anti-alkali and anti-halogen with chloride ion in magnesium chloride.



Lightly burned magnesia products from villages and towns in Liaoning and Shandong provinces are very popular all over the world. However, due to the low level of production equipment and manual operation of magnesia industry in villages and towns, a large amount of black smoke is discharged in production, which seriously pollutes the environment and urgently needs to be treated. The black smoke produced by light burning magnesia is difficult to meet the requirements of environmental protection by using simple conventional dust removal equipment. However, the cost of advanced smoke removal and dust removal equipment is unbearable for the township industry. Therefore, the treatment of light burning magnesia black smoke can only take a different approach and seek a way that can not only continue to promote the development of the township magnesia industry, but also promote the development of the township magnesia industry. New countermeasures to prevent smoke and dust from polluting the environment.

Light burnt magnesia powder

     

Light burning magnesia powder combustion process plan Light burning magnesia is sintered by magnesia kiln. The fuel used in sintering is high quality lump coal. Because of manual operation, the combustion efficiency is low, and the fuel can not be fully burned. Its particles are entrained into the flue and ejected from the chimney. In this paper, the burning technology of light magnesia is a new burning technology to change fuel combustion, that is, the burning technology of light magnesia coal to gas. Gas combustion process facilities (see Fig. 1) include gas facilities and air facilities. Gas facilities are composed of simple gas generator, gas pipe and gas butterfly valve, and air facilities are composed of blower, air pipe and air butterfly valve.



The practice of light-burning also shows that when the temperature and particle size of light-burning are fixed, the material residence time is too short, which will lead to underburning; otherwise, it will inevitably lead to overburning. Unburnt means incomplete decomposition of materials due to insufficient heat transfer and reaction time. Overburnt means that MgO particles stay too long in high temperature zone, grain growth, lattice development tends to be perfect, and product activity decreases. Overburning can also lead to waste of energy. Therefore, residence time is an important parameter to measure whether a light-burning equipment is reasonable in calculation and operation. The residence time of materials in the system is a stochastic process due to the non-uniformity of particle size, the complexity of air flow field in the system and the difference of separation efficiency of separators at all levels (resulting in particle backmixing). The residence time distribution (RTD) is studied by determining the probability density of RTD of materials in the system, seeking its digital characteristics, and then analyzing the rationality of the system design.


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