The types of magnesia chrome brick material

The magnesia chrome brick has high room temperature compressive strength, low porosity, strong erosion resistance and scouring resistance, etc. Usually it is used for bottom part of VOD.

Magnesia chrome brick types
Production of magnesia chrome brick with raw materials are: natural raw materials, synthetic raw materials and industrial chromium oxide and industrial alumina and other natural raw materials. Such as various grades of sintered magnesia, ordinary chrome ore and low impurity content of chromium concentrate synthetic raw materials: from the magnesite and chrome concentrate by grinding, mixing, compacting, and then calcined at high temperature made a total of Sintered magnesia chrome material; and by the magnesite and chrome ore by the fused fused refractory brick company magnesia chrome material; there are fused magnesia synthetic materials should generally be low impurities in raw materials.
The above raw materials are used differently. Combination and formula can be made of a large number of magnesia chrome refractory brick, so magnesia-chrome brick varieties, the name of chaos, easy to confuse. According to the name of magnesia chrome firebrick at home and abroad, the following can be standardized as follows.
(1) ordinary magnesia-chrome refractory brick china (ie, silicate-bonded magnesia-chrome brick), this brick is made of impurities (silica and CaO) more chrome and magnesia produced. Firing temperature is not high at 1550 ℃ or so. The microstructure of the brick is characterized by: the refractory grains are bound by silicate.
The pre-reaction of our production of magnesia chrome bricks is the improvement of this type of brick. Brick when the fine powder is used by the ordinary chrome and magnesite grinding, mixing, compacting, calcined magnesium chrome material, is still a combination of silicate. But the performance is better than ordinary magnesia brick.
(2) directly combined with magnesia bricks, is made of chromium concentrate with a low impurity content and relatively pure magnesia. The firing temperature is above 1700 ° C. The structure of the refractory bricks is characterized by direct contact between the refractory grains. So its high temperature performance, anti-erosion and anti-erosion are better than ordinary magnesite chrome bricks.
(3) combined with ladle refractories magnesia-chrome bricks, foreign often all synthetic raw materials were co-sintered magnesia chrome or fused magnesia chrome (or part of the fused magnesia) made of magnesia chrome are known as re-combination of magnesium chromium brick. And the domestic will only use all the fused magnesia chrome production of magnesia chrome brick called re-combination of magnesia-chrome brick. In order to be more consistent with the international community to use co-sintered magnesia-chrome brick and the melt and then combined with magnesia-chrome brick or melt-bonded magnesia chrome brick is appropriate.
Combined with magnesia-chrome brick because the brick raw materials are more pure, need to 1750 ℃ ??above the high temperature or ultra-high temperature firing, the microstructure characteristics of the spinel and other components are distributed evenly between the refractory grains directly contact The In the anti-erosion, anti-erosion than the first two kinds of magnesia chrome brick.
We developed a high-quality magnesia-chrome brick developed for the nickel-refining converter outlet, which is also a synthetic refractory brick.
(4) semi-re-combination of magnesia-chrome brick, according to the above combined with the meaning of magnesia-chrome brick, as long as the synthetic raw materials to make particles, chrome concentrate and magnesia fine powder made of magnesia chrome brick should be called half The Combined with magnesia-chrome brick and the domestic will be made of fused magnesia chrome particles, and to curb with fine powder or chrome powder and magnesite powder for the production of mixed powder of magnesia chrome brick are called semi-re-combination. Magnesia chrome brick In order to distinguish, can be used to make the melt particles, co-sintered magnesia chrome made of fine chromium chrome brick called co-sintered magnesia-chrome brick.
This kind of fire bricks manufacturers is also above 1700 ℃ high temperature firing, brick within the refractory grain is also directly between the main. Its advantage is better thermal shock resistance, anti-erosion, anti-erosion is also good.
(5) cast magnesia-chrome brick, is the use of magnesia and chrome ore by adding a certain amount of admixture, by mixing, billet and prime burn, broken into pieces, into the electric arc furnace melting, and then into the mold, annealing, ; Mother brick by cutting, grinding and other processing made of the required brick.
Casting magnesia carbon bricks structure is characterized by uniform distribution of ingredients, refractory grain between the main direct contact, silicate to island exists. This brick is particularly resistant to melt erosion, penetration and erosion. Is designed for non-ferrous smelting development of products. The most suitable in the continuous production of equipment such as smelting furnace such as flash furnace reaction tower and sedimentation tank slag line area.
(6) chemical combination does not burn magnesia chrome brick, the general use of magnesia and chrome ore for the brick raw materials, sodium polyphosphate or sodium hexametaphosphate or water glass as a binder to suppress the magnesia chrome brick. Do not need high-temperature firing, only about 200 ℃ temperature baking. As the bricks are not fired at high temperatures, the magnesite in the brick will hydrate, so the bricks can not be stored for long periods of time.
Chromium ore due to high temperature shrinkage when used, it can be used to do the burning of raw materials.

Yingkou Ruizhi Refractories Co., Ltd. is a professional China manufacturer of refractory materials for high temperature melting furnaces. Ruizhi Refractories supply main products are: Refractory material, refractory brick, refractory castable,refractory nozzle, ceramic fiber, fire brick, insulation material, for converter, electric arc furnace, ladle, LF furnace, tundish, foundry ladle, torpedo ladle, etc. Ruizhi has established technical cooperation relationship with some refractory research institutions and universities. Ruizhi Refractories products have been exported to such as South Africa, Australia, Canada, Malaysia, Bangladesh, Iran, Saudi Arabia, UAE, Iraq, Pakistan, Philippines, Vietnam, Singapore, Tajikistan, Indonesia, South Korea, Sri Lanka, Nigeria, Kenya, Ethiopia, etc.