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The new wholesale classification process of magnesia brick
The light burning powder is alkaline oxide by high activity after a certain temperature of light burned magnesite obtained, usually processed into 100-325 mesh fine powder for sale, main components of magnesia chrome brick for Magnesium Oxide, often containing iron, manganese, aluminum, calcium, silicon oxide impurities, commonly known as "light burned magnesia". The conversion of light burning powder to high purity superfine Magnesium Oxide through deep finishing can greatly improve the economic benefit and increase the added value of the product.
The pure Magnesium Sulfate solution was obtained by removing impurities from light burned powder. Then, the precursor of basic magnesium carbonate was obtained by adding precipitating agent. The precursor was calcined to obtain 98.3% pure Magnesium Oxide. The method has the characteristics of short process, simple operation, less investment, easy to get raw materials, low cost of product and good economic benefit.
The raw materials used in the production of magnesia chrome bricks are natural raw materials, synthetic raw materials, industrial chromium oxide and industrial alumina. Natural raw materials: such as sintered magnesia, all kinds of ordinary chrome ore and low impurity content of chromium concentrate. Synthetic raw materials: Magnesia and chrome ore by fine grinding, mixing, compacting, sintering of magnesia chrome materials and then calcined at high temperature; and by magnesite and chrome ore by fused magnesia chrome fused material prepared and fused magnesia. Synthetic material should generally be a raw material with low impurity content.
The above raw materials are different. The combination and formula can be made into many famous magnesia chrome bricks. Besides, the manufacturers don't want to explain more about their formula. Therefore, the varieties and names of magnesia chrome bricks are very confusing and confusing. According to the existing names of magnesia - chrome bricks at home and abroad, the following standardization can be made.
(1) ordinary magnesia chrome brick
This brick is made of impurities (SiO2 and CaO) and more production of magnesia chrome ore. The temperature of the firing is not high at about 1550. The microscopic structure of the brick is that the grain of the refractory is bonded by the silicate.
A fine powder produced by the refractory brick is used by the common magnesia chrome ore and grinding, mixing the magnesium chromium material uniform, compact, calcined, still with portland. But the performance is improved with ordinary magnesia brick.
(2) direct bonded magnesite brick
The direct combination of magnesia chrome brick is made from chromium concentrate with low impurity content and pure magnesia. The sintering temperature is above 1700 degrees C. The structure of the refractory brick is that there is a direct contact between the grain of the refractory. Therefore, its high temperature performance, corrosion resistance and anti scouring are better than ordinary magnesia chrome bricks.
(3) re combination of magnesia chrome brick
The magnesia chromium brick made from synthetic raw materials co sintered with magnesium chromium or electrofusion magnesia (or with partial fused magnesia) is called re bonded magnesia chrome brick. In China, the magnesia chrome brick made by the full use of electrofusion magnesium chromium is called re - combined magnesia chrome brick. In order to be more consistent with the world, it is suitable to use co - sintered magnesia chrome brick and electrofusion material to combine magnesia chrome brick or melted grain to combine magnesia chrome brick.
As a result of the pure brick making, the magnesia chrome brick needs to be burned at high temperature above 1750 C or under super high temperature. Its microstructure is characterized by the uniform distribution of the spinel and other components, and the direct contact between the refractory grains. It is better than the first two kinds of magnesia chrome brick in the anti erosion and anti scour.
The high quality magnesia chrome brick developed for the Nickel Converter tuyere is a kind of refractory brick because all the materials used are artificial synthetic materials.
(4) semi - re - combined magnesia chrome brick
According to the above meaning combined with magnesia chrome bricks, magnesia chrome bricks made of chrome concentrate and magnesia fine powder should be called semi re bonded magnesia chrome bricks if they are made of synthetic raw materials. China will be fused magnesia chrome material particles, and the total calamity knot material into fine powder or chrome ore powder with magnesia powder mixed magnesia chrome brick powder production is called semi bonded magnesia chrome brick. In order to distinguish, the magnesia chrome brick made from electric melting material and co - sintered magnesium chromium as fine powder is called fused magnesia chrome brick.
This kind of refractory brick is also burned at high temperature above 1700 centigrade, and the grain of refractory in brick is mainly based on direct combination. Its advantages are good thermal shock resistance, corrosion resistance, anti scouring is also good.
(5) melting and casting magnesia chrome brick
By adding a certain amount of magnesia and chrome ore admixture, mixing, compacting and burning, broken into pieces, into the electric furnace melting, and then injected into the mold, annealing, production of brick brick into the mother; mother by cutting and grinding into required refractory brick type.
The structure of molten magnesia chrome brick is characterized by uniform distribution, direct contact between refractory grains and isolated island in the form of silicate. This refractory brick is especially good for melt erosion, penetration and scour. It is specially developed for nonferrous smelting. The most suitable places in continuous production equipment such as flash smelting furnace reaction tower bottom and sedimentation tank slag line area.
(6) chemical unburned magnesia chrome brick
General use of magnesia and chrome ore raw material for making brick, magnesia chrome brick binder pressed with sodium tripolyphosphate and six sodium hexametaphosphate or water glass. It does not need to be burned at high temperature. It is roasted at about 200 c. Because the refractory bricks are not burned at high temperature, the magnesia in the bricks will be hydrated, so the refractory bricks can not be stored for a long time.
We use due to high temperature shrinkage, therefore can be used for brick raw material.