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Important refractories for burning magnesia powder

Release date:2018-01-20 Author: Click:

Light burned magnesia powder is an important refractory material

The resources of magnesium ore are very rich in China. The process of producing light magnesium carbonate by carbonization is divided into two kinds according to the different ore properties: Dolomite carbonization and magnesite carbonization. Dolomite carbonization process is mature, but because of the high calcium content in carbonization leaching process, the production of high purity products is limited. With the continuous development of smelting technology, many special operations in the metallurgical process tend to use high purity magnesia to greatly improve the life of refractory products and reduce the production cost. At the same time, due to the massive export of high-grade magnesite, the problem of comprehensive utilization of magnesium resources has become increasingly prominent. For this reason, the low grade magnesite ore was used to extract high purity Magnesium Oxide (wMgO greater than 99%) by carbonization. In the experiment, the properties and light burning properties of magnesite, the process of digestion of Magnesium Oxide and the technological conditions and parameters of carbonization leaching were studied, and high pure magnesia was produced by the obtained high purity magnesium carbonate.

The mineral composition of the sample is relatively simple, the main minerals are magnesite and dolomite, the secondary minerals are talcum and chlorite, and the trace minerals include quartz, limonite, pyrite, apatite and so on. MgO is mainly composed of ore minerals, magnesite and gangue minerals dolomite, talc and diagonal chlorite. CaO exists in two forms in minerals: one is in the form of a basic form of independent mineral formation, such as dolomite and apatite light magnesia, and the other in the form of dolomite micro inclusions in magnesite crystals. SiO2 also exists in quartz, talcum, cable-chlorite, tremolite, Andalusite in two forms. The other is in magnesite crystals in the form of fine mechanical inclusions of quartz and silicate minerals.

Light burned magnesia powder is a kind of medium with medium alkalinity and chemical activity. Besides being a refractory and a cementitious material, the light burned magnesia powder is also used in other industrial fields. In addition, the development of converter slag splashing technology has further expanded the application scope of light burned magnesia powder. At present, the technology of slag splashing is used to make the light burned magnesia powder after the ball, with light burning magnesia powder, carbon containing light burning Magnesium Oxide and carbon containing calcium and light burning magnesia powder.

Light burned magnesia powder, short for light magnesia powder, is a kind of activated Magnesium Oxide obtained by calcining of magnesite, brucite and magnesium hydroxide extracted from sea water or brine through calcining at about 800~1000. The light burned magnesia powder is light yellow and light brown powder, the grain size is mostly below 100 mesh, the periglast crystal is very small, the density is 3.07~3.22g/cm3, the lattice constant is large, the lattice defect is large, the lattice defect is many, the texture is brittle, the light burning magnesia powder is porous structure, the reactive activity is very large, the solid phase reaction or sintering is easy to be carried out, and Mg (OH) (OH) 2 is hardened with water. It has the ability to bond.

Light burned magnesia powder

Choosing calcining way and controlling light burning temperature is an important means to obtain good activity. With the increase of calcination temperature, the specific surface area of MgO decreased significantly. When the temperature is greater than 1000 degrees, the recrystallization speed of MgO increases, the dispersion decreases sharply and the activity becomes worse. Using different calcination methods and calcining equipment at the same temperature is also an important factor affecting MgO activity. If the fluidized bed furnace and suspension furnace are used to calcinate and decompose rapidly in an instant, the magnesia powder with maximum activity can be obtained. In the way of tunnel kiln and large reflector kiln, the calcining time is very long, which often makes the surface burn over and burn internally, which will reduce the activity of light burned magnesia powder. The calcination of granular magnesite by rotary kiln is between the two, and it can also maintain the activity of light burned magnesia powder.

Light burned magnesia powder

1 the weight of each batch is not more than 120 t per batch.

2 the sample size should be sampled before the batch. The samples for chemical analysis should be sampled after the batch. 25kg take one sample per 20 bags, and each big bag (1000kg) takes one sample.

After mixing the obtained granularity samples, the particle size was determined by 10~20g. After mixing, the samples were reduced to 200g and sent to laboratory for analysis.

3 if a chemical component is not qualified or abnormal, a double number of samples in the same batch of products are rechecked once, and the result of the reinspection is the final test result of the product. In recent years, the situation of light burned magnesia powder steel industry is grim, the cost pressure before iron has increased sharply, and the quality of iron ore powder has been deteriorating continuously. In order to stabilize the sinter quality and reduce the cost of ironmaking production at the same time, Jingtang company of Shougang, after a series of basic studies, finally realized the sintering of natural magnesium. The sinter grade, strength, grain size, metallurgical property and droplet performance were improved, and considerable economic benefits were created.

Light burning magnesium balls have obvious advantages in reducing magnesium

As the main burden of blast furnaces in the Asia Pacific region, sinter generally accounts for more than 60% of the blast furnace structure. Magnesium melting agents such as dolomite and serpentine are usually added to increase the MgO content in blast furnace slag to improve the fluidity and desulphurization capacity of the slag and to adapt to the high Al2O3 mass fraction in the slag.

Sintering is the main source of MgO for blast furnace slag, and its MgO content is limited by the requirement of blast furnace slag and the operation habit of blast furnace. The content of MgO in blast furnace slag of Japan and Korea is controlled at 3%~5% level, and most of them are above 7% in China. By this effect, the MgO content of the sinter in Japan new iron, South Korea Pohang light Yang and the modern iron making sinter is at the level of 0.7%~1.2%, while the MgO content of the sinter in China is mostly above 1.6%, and the high is even above 3%. Even some researchers believe that the higher MgO content in sintering is beneficial to the improvement of sinter quality.

In recent years, a large number of domestic light burned magnesia ball sintering researchers have called for light magnesia ball sintering and magnesium reduction, and Shougang Jingtang has been at the forefront of practice. The project group carried out a series of MgO laboratory studies on sintering process heat balance calculation, sintering basic characteristics test and high temperature confocal in-situ observation, ore phase research, sintering cup test and comprehensive furnace drop performance test.

The study found that:

Magnesium reduction helps to improve sinter grade, helps to develop high quality calcium ferrite and improve sinter reduction. Reducing the MgO by 0.5% can increase the TFe content of sinter by more than 0.3%. Under the background of the deterioration of imported ore fines, the magnesia also shows the value of actively protecting sinter grade. The improvement of sinter grade will help to form more high quality bonding phase - acicular calcium ferrite, which is beneficial to the Sinter Index and the improvement of the original quality of light burning magnesia powder.

Magnesium reduction helps to reduce the heat consumption of flux, thereby increasing the effective heat of sintering. Magnesium containing flux can decompose heat consumption during sintering process and reduce the ratio of magnesium containing flux to save energy and improve sinter quality. The MgO content of sinter is reduced by 0.5 percentage points, and the single consumption of magnesium flux is reduced by 14kg/t sinter. The decomposition heat loss of the sintering process is reduced by about 1%, which is equivalent to increasing the effective heat of the sintering process by 1%, which is beneficial to the improvement of the granularity composition of sinter.

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    Phone: 0412-3778988


    Address: the archway Industrial Park of the archway of the archway of Haicheng

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