Welcome to the official website of Yingkou South Building Dongtai Refractory Company!

Products

Contact us

Contact:Manager Liu

phone:+86 13840777765

address:China Liaoning Yingkou City Nanlou Dongtai Refractory Co., Ltd.

Website :  en.ykdtnh.com

URL:www.ykdtnh.com

Ore furnace magnesia brick

Your current location : Home >> Products >> Ore furnace magnesia brick

Ore furnace magnesia brick

Product attributes

  • Classification:Ore furnace magnesia brick
  • Product no. :1568169629
  • Number of visits:0
  • Date of issue:2019-10-14
  • Product overview
  • performance characteristics
  • Technical parameters

Ore furnace magnesia brick


The main crystal phase of magnesia brick is periclsite, and the magnesia brick manufacturer has the typical characteristics of general alkaline refractory products, but the thermal shock resistance is poor.


Magnesia bricks are divided into burnt magnesia bricks and non-burn magnesia bricks. The burnt magnesia bricks are divided into silicate-bound magnesia bricks, direct-bonded magnesia bricks, and re-combined magnesia bricks Non-burned magnesia bricks are further divided into chemically bonded magnesia bricks and asphalt-bonded magnesia bricks.


The raw material of magnesia brick is mainly magnesite, and its basic component is MgCO3. After high temperature calcination, it is crushed to a certain particle size to become sintered magnesia. Magnesia is widely used as a material for repairing furnaces, beating materials, and magnesia containing less impurities (ω(CaO)<2.5%, ω(SiO2)<3.5%) as a raw material for the production of magnesia bricks. China's magnesium reserves and production are among the highest in the world.


Magnesia bricks are divided into sintered magnesium bricks and chemically combined magnesium bricks according to their different production processes. The sintered magnesia brick is made of calcined magnesia with appropriate particle size ratio, added with brine (MgCl2 aqueous solution) and sulfite pulp waste liquid as a binder, and is formed by pressure molding at a high temperature of 1550~1650 °C. The chemically-bonded magnesia brick is not subjected to the calcination process. After the sintered magnesia is proportioned according to the particle size ratio, an appropriate amount of mineralizer and binder are added, and the mixture is pressed and formed, and after drying, it is a finished product. The chemically bonded magnesia bricks have lower strength and are not as good as sintered magnesia bricks, but they are cheaper than half the price of sintered magnesia bricks. It is used in areas where performance requirements are not too high, such as furnaces and soaking furnace bottoms.


Magnesia brick is an alkaline refractory material. It has strong resistance to alkaline slag, but it can not resist the erosion of acid slag. It can react with silica brick, clay brick and even high alumina brick at 1600 °C. The refractoriness of magnesia bricks is above 2000 °C, but its load softening point is only 1500~1550 °C. Moreover, the temperature interval from the beginning of softening to 40% deformation is very small, and the thermal stability of only 30~50 °C magnesia bricks is also poor, which is an important reason for the damage of magnesia bricks.


On the heating furnace and the soaking furnace, the magnesia brick is mainly used for paving the surface layer of the bottom of the furnace and the lower part of the furnace wall of the soaking furnace, which can resist the erosion of the scale.


The magnesia raw material is crushed into granules and powders, and after being compounded according to a certain ratio, the binder is added and mixed into a slurry, and then formed into a magnesia brick by molding, drying, firing, and the like. The firing temperature of ordinary magnesia bricks is generally 1500~1650 °C, and the firing temperature of high-purity magnesia bricks is as high as 1700~1900 °C. The chemical bonding magnesium brick production process is basically the same, but the chemical bonding agent is combined without high-temperature firing, and only the low-temperature heat treatment is required to make the non-burning magnesium brick.


label

Recent browse: