Carbon brick special for blast furnace hearth and preparation method thereof

Abstract

The invention relates to a carbon brick special for a blast furnace hearth and a preparation method thereof. The technical solution is as follows: firstly, coal tar pitch, stearate, polyphosphoric acid, a surfactant, an additive and a complexing agent are mixed, heat-treated, crushed and sieved to obtain a sieving material A with the particle size less than 0.088mm ; then the sieving material A, maleic acid, zinc oxide powder, copper powder and the complexing agent are uniformly mixed, heat-treated, crushed and sieved to obtain a sieving material B with the particle size less than 0.088mm; then electrically calcined anthracite with the particle diameter of 8 to 1mm, electrically calcined anthracite with the particle diameter less than 1mm and greater than or equal to 0.088mm, amorphous graphite, the sieving material B, thermosetting phenolic resin, manganese powder and cobalt powder are mixed and milled, subjected to compression molding, cured, and roasted under the carbon burial atmosphere and the condition of 1300 to 1500 DEG C for 5 to 8 hours to obtain the carbon brick special for the blast furnace hearth. The carbon brick and the preparation method thereof, provided by the invention have the advantages of wide sources of raw materials, simple process and low production cost. The produced carbon brick has the advantages of high strength, large thermal conductivity and excellent resistance to molten iron melting loss.

Description

technical field [0001] The invention belongs to the technical field of carbon bricks. Specifically relates to a carbon brick for a blast furnace hearth and a preparation method thereof. Background technique [0002] The blast furnace is the main equipment in the iron and steel metallurgy industry to produce molten iron using the iron ore-coke reduction method. With the modernization and large-scale development of blast furnaces and the realization of enhanced smelting technology, prolonging the life of blast furnaces has become the main way for iron and steel enterprises to reduce consumption and increase efficiency. The areas that determine the life of a blast furnace are mainly the bottom and hearth areas, especially the abnormally eroded areas below the taphole and below the taphole. Carbon refractories are widely used as hearth lining materials due to their good thermal conductivity, high thermal shock stability, low thermal expansion coefficient, and poor affinity wit...

AI Technical Summary

Problems solved by technology

However, the carbon bricks for the blast furnace hearth prepared by the prior art scheme, due to the high volatile content of pitch and the low carbon residue rate, the strength, thermal conductivity and melting resistance of the prepared carbon bricks are reduced; resin is used as an additive Or binder, although it is convenient for low-temperature or room-temperature molding of the product, it will significantly increase the cost. In addition, the resin will form amorphous glassy carbon after carbonization, which has poor thermal conductivity and low carbon residue rate, which greatly reduces the thermal conductivity of carbon bricks.