Nano-matrix-combined high-performance fused magnesium calcium brick and manufacturing method thereof

Abstract

The invention provides a nano-matrix-combined high-performance fused magnesium calcium brick and a manufacturing method thereof. The fused magnesium calcium brick is prepared from 8-5mm high-calcium fused magnesium calcium sand, 5-2mm high-calcium fused magnesium calcium sand, 2-0mm high-calcium fused magnesium calcium sand, <=0.074mm high-calcium fused magnesium calcium sand, 8-5mm fused magnesite, 5-2mm fused magnesite, 2-0mm fused magnesite, <=0.074mm fused magnesite fine powder, nano sea water magnesia fine powder and a binder paraffin. The manufacturing method comprises the following steps: fine powder premixing, integral compounding, molding, drying, firing and the like. The product has the advantages of compact microstructure, fewer low-melting-point minerals, higher erosion resistance, higher scour resistance, higher stripping resistance and higher hydration resistance. The furnace life is prolonged by 30% above on average. Thus, the product satisfies the requirements of high efficiency, long service life and high cleanness for stainless steel and special steel smelting, and lowers the cost for the steel enterprises.

Description

technical field

[0001] The invention relates to a nanoscale 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 technique

[0002] 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 fired dolomite sand (sintered magnesia-calcium sand) and fused magnesia as the main raw materials to produce magnesia-calcium bricks. The physical and chemical indicators and performance of magnesia-calcium brick products have the following problems, such as: SiO 2 、Al 2 o 3 , Fe 2 o 3 The sum of the three impurities is 2~3%, the impurity content is too high, and it reacts with molten steel and slag to form more low-melting substances, which is no...