Showing posts with label refractories material. Show all posts
Showing posts with label refractories material. Show all posts

Monday, January 19, 2015

Correct methods to select good quality refractories with low cost



      High temperature industrial development cannot do without refractory material function, especially in the iron and steel, nonferrous metals, glass, ceramics, cement, petrochemical, machinery, boilers, light industry, electric power, military and other fields, is the basic material of an operation and technology industrial production, with each field of industry continue to increase, the demand quantity of refractory products is also gradually increasing, which requires every manufacturer increase production, while at the same time ensuring the production quality of the product is the most critical, it is also the fundamental in all areas of normal operation. For how to choose the right refractory is introduced in following four aspects:
1 according to the structure, working characteristics and motion conditions of the furnace and the analysis of material damage reasons, in order to choose the appropriate refractory. Accurate understanding and grasp the temperature changes of all parts of the material, carefully observe the material to prevent by all kinds of destructive effects, such as: high temperature molten metal erosion.
2 familiar with the material chemical composition and physical, work performance, so as to give full play to the characteristics of material.
3 so that all parts of the furnace material reasonable match, in order to avoid the mutual damage at the same time between material, but also take measures to ensure that the service life of the whole.
4 basic principles in satisfying the conditions above, to solve the resource and cost as much as possible. Can choose prices and transport costs low material, at the same time, vigorously develop the recycling, reduce the cost of.
We Xinmi Changxin refractories plant convenient transportation, rich in resources, is the base for the production of refractory materials ideal, high-quality refractory raw materials base believe refractory products can produce satisfactory.

Monday, November 24, 2014

Refractory materials commonly used in neutral and alkaline induction furnace

Neutral and alkaline lining is used only for induction furnace capacity of less than 10 tons. The cost is much higher than the acidic lining lining, so must meet the smelting efficiency is very high to the economy. Neutral and alkali furnace refractory material is sexy:
(1) Sintered magnesia. The erosion of the sintered magnesia against molten metal and slag is very good, and high refractoriness, disadvantage is the contraction occurred two times during sintering, resulting in cracks and voids. Risk also contained the fully sintered, affect the elastic. Cause of crack;
(2) Fused magnesia. Electric volume stability of fused magnesia is good, but expensive than sintered magnesia.
(3) Magnesia - alumina - spinel. Magnesia - alumina - spinel due to volume expansion appears in the formation of spinel, so as to compensate the shrinkage of magnesia. Degree of expansion by the number and shape of corundum and mineralizing agent control. (4) Chrome magnesia - alumina - spinel. Chrome magnesia - alumina - spinel besides the advantages of the spinel, also has good thermal stability;
(5) The calcium oxide crystallization. Calcium oxide crystallization created favorable conditions for dephosphorization and desulfurization, but easy to crack, and cooling easily. In addition, the stove temperature will absorb moisture, so it is in danger of hydration. The crystallization of calcium oxide lining can neither be ramming material, also can not be made into bricks used in induction furnace.