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

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

Magnesite-chrome bricks can be roughly divided into six different types depending on their production methods. 1) silicate combined with magnesite chrome brick; 2) directly combined with magnesite chrome brick; 3) fused with magnesite chrome brick; 4) semi-recombined magnesite chrome brick; 5) fused cast magnesite chrome brick; 6) chemical bonding does not burn Magnesite-chrome bricks; among them, copper smelting thermal kiln, the most widely used genus: direct combination of magnesite chrome brick, semi-recombined magnesite chrome brick and electrofusion combined with magnesite chrome brick.

Direct combination of magnesite chrome brick

The direct combination of 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 parts of the direct combination of magnesite chrome bricks are: the bottom of the top-blown converter, the non-working layer of the furnace wall; the circumference of the horizontal converter cylinder; the circumference of the 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.

Electrofusion combined with magnesite chrome brick

The electrofusion and recombination magnesite chrome brick is obtained by electrofusion melting the 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 recombination magnesite chrome bricks is between the fused cast brick and the direct bonded brick.

The main application parts of fused recombination magnesite chrome brick are: top blowing converter furnace working layer, direct contact with copper liquid; 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-recombined magnesite chrome brick

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

In practical applications, reasonable magnesite-chromium 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-chromium unshaped refractories such as magnesite-chrome crucibles, magnesite fillers, and magnesite-chromic castables are also used in the copper metallurgical thermal kiln.