| MgO is the core of magnesium compounds because of its high output, wide use, lots of kinds, mainly MgO is the materials of the other pure magnesium compounds.Magnesium compounds are mass-produced in China, the reserves of magnesite resources account for 1/3 in the world. China is a country which exports largely magnesian salts.China has a long coastline, so it has large amounts of seawater. The most briny salt is produced in China, so it has about 2000m3 haloid water as outgrowth. Haloid water is the concentrated seawater, in which, the consistence of solubrlrty salt is 40-50 times of seawater, its main component is magnesium. If we use haloid water to produce magnesian compounds, the products is not only more cheaper, but also less impurities, equality components, easily preparated high pure magnesian products. With this method, we can decrease the twice pollution. But in a long time, people don't focus on this instance and more than 90% haloid water is not fully used.With the quick development of technology, the use of magnesian products are more widely, specially in the fields of advanced technology, we need high quality magnesian products. But the technics of magnesian industry is draggle, high economic costs, high energy costs, less kinds of products. So we can not compete with the developed countries and lose much of markets.This paper about the technics is according to the situation of our country, using the material of haloid liquid, ammonium bicarbonate and ammonia to prepare the super light MgO. Few of this technics is reported hi foreign. There are some experiment researches in China, but they only stay experiment stage. In Shangdong, even though some small industries use ammonium bicarbonate as precipitator to produce the super light MgO, but the technics is not reasonable ,in high energy, badly economic benefit. So they are all in bad status. So the main purposes of this paper is to research high appendice super light MgO and its new technics, lessen energyconsume, large economic benefits and society benefits.This paper about the technics is to use the material of haloid liquid, ammonium bicarbonate and ammonia to preparate the super light MgO. First, we use ammonium bicarbonate and ammonia to have the prescriptive consistency solution, then add the solution into haloid liquid drop by drop and reaction each other in the fixed temperature. After reaction we add ammonium bicarbonate solid into the solution in batches until deposited completely. Secondly, we use the methods of aging, pyrolysis, filtration, lavation, desiccation, shiver, calcinations, finally, the super light MgO is obtained. From the amount of ammonium bicarbonate and ammonia, reaction temperature, specific votume, recycle rate, we can find the excellent technics condition. So we can produce the super light MgO under the condition of less material and less energy. On this base, we have a magnified experimentation. It means that the result is very good. The virtues of this technics is simple, controllable, steady quality, high annex and more economic benefits.Although there are few of impurities in haloid water, in order to ensure the quality of the products, we have to purify it. We add little NaCIO and a little CaCk which molar scalar is same with the SO42" to dispose of the impurities, such as iron, manganese, SO42". According with the principle of reaction, in experimentation, we grasp the sticking point which in reaction of ammonium bicarbonate, there it creates HCOs" and COi, and both of the two can be used circularly to search after the conditions of the experiment. Through the experiment, we can confirm the ratio of dosage of ammonia and haloid wate, the ration of dosage of ammonium bicarbonate and ammonia. The best rations of the three are: Haloid water: Ammonia=l:0.221, Ammonia : Ammonium bicarbonate=l:0.61 by mass, respectively.With the rations of them, we can make the consuming of ammonium bicarbonate decrease from 4-6 tons to about 2 tons, and reduce the production costs.Through the experiment of the relations... |
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