A copper-composite magnesia-chrome brick and its manufacturing method

Abstract

The invention belongs to the technical field of refractory materials, especially refractory materials for nonferrous smelting, and especially relates a copper composite high-performance magnesia-chrome brick and a manufacturing method thereof. The brick comprises 1-10 wt% of copper composite magnesia-chrome synthetic sands with the particle size being 3-5 mm, 10-35 wt% of copper composite magnesia-chrome synthetic sands with the particle size being 1-3 mm, 10-25 wt% of copper composite magnesia-chrome synthetic sands with the particle size being 0.088-1 mm, 1-5 wt% of fused magnesia-chrome sands with the particle size being 3-5 mm, 1-15 wt% of fused magnesia-chrome sands with the particle size being 1-3 mm, 2-13 wt% of fused magnesia-chrome sands with the particle size being 0.088-1 mm, 5-20 wt% of fused magnesia-chrome sands with the particle size being not more than 0.088 mm, 1-5 wt% of fused magnesia with the particle size being 3-5 mm, 1-15 wt% of fused magnesia with the particle size being 1-3 mm, 2-13 wt% of fused magnesia with the particle size being 0.088-1 mm, 5-20 wt% of fused magnesia with the particle size being not more than 0.088 mm, 2-10 wt% of chromium concentrate with the particle size being not more than 0.088 mm, 1-6 wt% of a composite additive and 3-5 wt% of an (externally added) binder. Magnesia-chrome brick wastes generated by the nonferrous smelting can be fully used reasonably and effectively in the invention.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, is specifically used in the aspect of refractory materials for non-ferrous smelting, and in particular relates to a copper-composite high-performance magnesia-chrome brick and a manufacturing method thereof. Background technique [0002] Magnesium chromium refractories due to Cr 6+ Pollution problems have been gradually replaced by low-chromium or chromium-free refractory materials in the field of ferrous metallurgy, but in the field of non-ferrous metallurgy, the slag system belongs to FeO-SiO 2 system, not only the slagging time is long, the amount of slag is large, but also the FeO content in the slag is as high as 35%, and only magnesium-chromium refractories can adapt to this condition. In other words, in the field of non-ferrous metallurgy, magnesia-chrome bricks also have an irreplaceable position and role. [0003] In recent years, with the continuous development of the non...

AI Technical Summary

Problems solved by technology

[0005] 1. Cr 2 o 3 It has high temperature volatility, the higher the temperature, the greater the volatilization; high temperature or ultra-high temperature firing above 1750 ° C is easy to cause Cr 2 o 3 The volatilization loss not only causes the reduction of the beneficial components in the brick, but also aggravates the loss of resources, and also makes Cr 6+ The pollution problem is getting worse

[0006] 2. The firing of traditional directly combined magnesia-chrome bricks belongs to solid-phase sintering. The internal porosity of the brick body is relatively high, generally as high as 15-17%, and the size of the pores is very uneven, which is not conducive to preventing the penetration of slag along the internal pores; and Magnesia-chrome bricks for non-ferrous use require that the brick body should have better permeability resistance, so as to prevent a large amount of penetration of Cu-containing slag, improve the service life, and promote the protection and utilization of chromium and copper resources.

[0007] 3. The traditional direct combination of oxides of various components in the magnesia-chrome brick reacts with the infiltrated slag to form a high-temperature phase, which has a certain filling effect on the pores and has a good effect on resisting the penetration of liquid slag. SO 2 and SO 3 Such as the penetration of gas oxides, but can not achieve a good blocking effect; so it is necessary to strengthen, improve and improve the ability of traditional magnesia-chrome bricks to block gas penetration

[0008] 4. Traditional direct combination of Fe in magnesia-chrome bricks 2 o 3 The content is as high as 7-12%. In batch production kilns, Fe 2 o 3 The decomposition and oxidation reactions between FeO and FeO are frequently carried out alternately in magnesia-chrome bricks, which seriously deteriorates the structural strength of magnesia-chrome bricks, which in turn reduces the ability of magnesia-chrome bricks to resist high temperature and slag corrosion, and easily causes magnesia-chrome materials early damage

Images