Your current location : Home >> News >> Industry information

A kind of nano-scale matrix combined with high-performance fused magnesia-calcium brick and its manufacturing method

2021-08-19 02:17:21
a

Fused magnesium calcium technical field


The invention relates to a nano-scale matrix combined with high-performance fused magnesia-calcium brick and a manufacturing method thereof, belonging to the technical field of refractory materials for special steel smelting furnaces such as stainless steel.


Background technology of fused magnesia calcium Calcined dolomite


As we all know, magnesia-calcium brick has become an indispensable and difficult to replace refractory material for special steel smelting equipment such as stainless steel. At present, domestic magnesia-calcium bricks use sintered dolomite sand (sintered magnesia-calcium sand) and fused magnesia as the main raw materials, and the physical and chemical indicators and performance of magnesia-calcium brick products produced have the following problems, such as: SiO2, Al2O3 The sum of the three impurities of Fe2O3 is 2~3%, the impurity content is high, and the reaction with molten steel and slag generates more low-melting substances, which is not conducive to the resistance of the product to chemical corrosion; the bulk density without wax immersion is about 3.00g/cm3 , The apparent porosity is 8~12%, and the structure is not dense enough, which reduces the penetration ability of the product to resist molten steel and slag; the above two points also reduce the thermal shock stability and anti-stripping performance of magnesia-calcium brick; the product itself The hydration resistance is not strong, and it needs to be dipped in wax, which increases the manufacturing cost; the CaO content is relatively low, between 20 and 30%, and the ability to clean steel is not ideal.


Mid-range magnesia performance


With the further development of stainless steel smelting technology and process, the use conditions of magnesia-calcium bricks are more severe, such as: larger furnace capacity, increased furnace pressure, increased smelting temperature, and longer smelting time. At present, the performance of magnesia-calcium bricks can no longer meet the target requirements of blast furnace age and low cost. In addition, due to the easy hydration of magnesia-calcium bricks, there is still no mature production technical solution for high-calcium magnesia-calcium bricks (CaO ≥ 35%) with stronger ability to purify molten steel. Calcined dolomite Therefore, the development of magnesia-calcium bricks that are not easy to hydrate and have higher performance has important practical significance and application prospects for the development of high efficiency, longevity and cleanliness of stainless steel and special steel smelting.


The content of the invention of fused magnesium calcium


In order to solve the above problems, the present invention provides a nano-scale matrix combined with high-performance fused magnesia-calcium brick and a manufacturing method thereof, aiming at further improving the purity and compactness of the magnesia-calcium brick, and improving the erosion resistance, anti-corrosion and anti-corrosion properties of the magnesia-calcium brick. Penetration performance, erosion resistance, spalling resistance, hydration resistance, and finally meet the purpose of stainless steel smelting. Calcined Dolomite


In order to achieve the above purpose, the technical scheme adopted in the present invention is: a nano-scale matrix combined with high-performance fused magnesia-calcium brick is formed by the following raw materials in proportion by weight:


8~5mm high calcium fused magnesia calcium sand 5~10 parts,


5~2mm high calcium fused magnesia calcium sand 20~35 parts,


2~0mm high calcium fused magnesia calcium sand 20~30 parts,


≤ 0.074mm high calcium fused magnesia calcium sand fine powder 10~15 parts,


8~5mm fused magnesia 5~10 parts,


5~2mm fused magnesia 0~15 parts,


2~0mm fused magnesia 0~10 parts,


≤ 0.074mm 5~10 parts of fused magnesia fine powder,


Nano-scale seawater magnesia fine powder 5~10 parts,


Binding agent 2 to 5 copies.


The label

0

Recent browse: