Infiltration of molten
state in refractories copper matte with good mobility. Due to the
surface in the reaction tower refractory lining is covered with a layer
of dense with magnetic iron oxide for hanging slag layer is mainly
composed of, so he struck the wall surface matte does not directly
penetrate into the brick body, but first of all along the silicate slag
channel infiltration within the material and the interaction and slag,
slag at different depth generate Cu or Cu2O material.
Reaction tower wall surface slag although direct intrusion
effectively prevents the copper matte, but did not completely eliminate
the erosion caused by the matte of lining. Through the slag layer, there
are still a small number of matte can penetrate through, and then along
the brick body pores or cracks penetrate within the capillary channel
brick. Because of the more close to the brick center, oxygen potential
is higher, so into the brick body after the copper matte is prone to
oxidation reaction. After reaction, the generated Cu2O exists between
the lining the main crystal and the matrix, and no penetration into the
other grains.
Molten copper oxide (CuO-Cu2O at 1140 DEG C when the low total
soluble) will cause the increase of permeability brick thermal
conductivity, the resulting expansion of strong diathermy, lining
spalling and, in which Cu is oxidized to CuO, the volume expansion of
75%; oxidized into Cu2O, volume increased by 64%. Therefore, from the
microscopic structure, corrosion of matte on the reaction tower lining
is mainly for the chemical structure of permeability, copper matte and
the resulting stress reaction.
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