Carbon brick for blast furnace and preparation method thereof

Abstract

The present invention relates to a carbon brick for a blast furnace and a preparation method thereof. The technical scheme is as follows: first, mixing coal tar pitch, stearate, polyphosphoric acid, a surfactant, a complexing agent and an additive evenly for heat treatment, crushing and screening to obtain a screened material A with the particle size less than 0.088mm; mixing the screened material A, maleic acid, zinc oxide powder, copper powder and a complexing agent evenly for heat treatment, crushing and screening to obtain a screened material B with the particle size less than 0.088mm; electrically calcined anthracite with the particle size of 8-1mm, electrically calcined anthracite with the particle size less than 1mm and greater than or equal to 0.088mm, amorphous graphite, the screened material B and manganese powder for thermal mixing at 140-180 DEG C for 5-30 minutes, vibration molding and roasting for 5-8 hours at 1200-1500 DEG C in a carbon buried atmosphere, to obtain the carbon brick for the blast furnace. The preparation method has the advantages of simple process, wide raw material source and low production cost, and the carbon brick for the blast furnace has the characteristics of high strength, large thermal conductivity and excellent resistance to molten iron loss.

Description

technical field [0001] The invention belongs to the technical field of carbon bricks. In particular, it relates to a carbon brick for a blast furnace 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. Carbonaceous refractories are widely used as furnace lining materials due to their good thermal conductivity, high thermal shock stability, low thermal expansion coefficient, and poor affinit...

AI Technical Summary

Problems solved by technology

The carbon bricks for blast furnaces prepared by the prior art, due to the high volatile content of asphalt and low carbon residue rate, the strength, thermal conductivity and melting resistance of the prepared carbon bricks are reduced; resins are used as additives or binders, although it is convenient for products Low temperature or normal temperature molding, but it will significantly increase the cost. In addition, the resin is carbonized to form amorphous glassy carbon, which has poor thermal conductivity and low carbon residue rate, which greatly reduces the thermal conductivity of carbon bricks.