Magnesite-chrome brick is the most widely used refractory brick in copper smelting furnace. It is used in top-blown converter, horizontal converter, anode furnace, flash furnace, electric arc furnace, Kievertett furnace, Ausmelt furnace, reverberatory furnace, and oxygen enrichment. Among the common copper smelting furnaces such as bottom blowing furnaces, magnesite chrome bricks are the main configuration.

Magnesite-chrome bricks, as the name implies, are made by sintering magnesite chrome sand according to a certain ratio, adding an additive to form a sintered body. According to its chemical properties, magnesite chrome bricks are basic refractory bricks. It is the most widely used in non-ferrous metals, especially copper smelting.

Magnesite-chrome bricks can be roughly divided into six different types depending on their production methods. 1) silicate bonded magnesite chrome brick; 2) direct bonded magnesite chrome brick; 3) fused rebonded magnesite chrome brick; 4) semi-rebonded magnesite chrome brick; 5) fused cast magnesite chrome brick; 6) chemical bonding does not burned magnesite-chrome bricks; among them, copper smelting furnace, the most widely used are: direct bonded magnesite chrome brick, semi-rebonded magnesite chrome brick and fused rebonded magnesite chrome brick.

Direct bonded magnesite chrome brick

The direct bonded magnesite chrome brick has high high temperature strength, slag resistance, erosion resistance, erosion resistance, corrosion resistance, excellent thermal shock stability and volume stability at 1800 °C. The main application area of the direct bonded magnesite chrome bricks are: the bottom of top-blown converter, the non-working layer of the furnace wall; the circumference of the horizontal converter cylinder; the circumference of cylinder of the anode furnace; the wall of the Cavite furnace; Ausmelt Furnace wall; reverberatory furnace top, furnace wall; oxygen-rich bottom blowing slag line.

Fused rebonded magnesite chrome brick

The fused rebonded magnesite chrome brick is obtained by electrofusion melting raw material into fused magnesite chrome, pulverizing into a certain particle size, and mixing, forming and sintering. The combination of magnesite-chrome bricks is a fine-grained matrix with uniform pore distribution and micro-cracks, which is more sensitive to rapid temperature changes than casting. The high-temperature performance of fused rebonded magnesite chrome bricks is between fused cast brick and direct bonded brick.

The main application area of fused rebonded magnesite chrome brick are: top blowing converter furnace working layer, direct contact with copper melt; horizontal converter furnace mouth; anode furnace mouth; flash furnace reaction tower; electric furnace mouth; The working layer of the special furnace bottom; the wall of the Ausmelt furnace, the bottom of the furnace; the lower part of the slag line of the oxygen-rich bottom blowing furnace, and the wind eye area.

Semi-rebonded magnesite chrome brick

The semi-rebonded magnesite-chrome brick refers to a refractory product fired from a portion of fused magnesite chrome. The main mineral composition of the semi-rebonded magnesite chrome bricks is periclase, spinel and a small amount of silicate. Its resistance to thermal shock is better than direct bonded magnesite chrome bricks. The main application area of semi-rebonded magnesite chrome bricks are: flash furnace sedimentation tank wall; electric arc furnace; Ausmelt furnace; reverberatory furnace bottom working layer, copper outlet;

In practical applications, reasonable magnesite-chrome bricks should be configured according to the structure of the furnace and the working conditions. In addition to the above-mentioned magnesite-chrome bricks, magnesite-chrome unshaped refractories such as magnesite-chrome crucibles, magnesite fillers, and magnesite-chrome castables are also used in the copper smelting furnace.