Why should magnesia chromium refractories be chosen for lining of Ni-Fe alloy furnace?

February 25, 2019

The structure, tuyere arrangement, blowing, smelting temperature and slag composition of Ni-Fe alloy refining converter and copper smelting converter are similar. At the same time, the lining of the nickel-smelting converter also has problems similar to those encountered in copper-smelting converters, and various factors have caused damage to the refractory materials. Therefore, we have developed suitable refractory materials for these characteristics. Magnesium-chromium refractories are made by adding chromium power into magnesia to resist slag erosion, thereby extending the service life of the nickel alloy charge.

Why should magnesia chromium refractories be chosen for lining of Ni-Fe alloy furnace

1, Bulk density

The bulk density of the magnesia-chromium refractory material increases after firing. Since the liquid phase is generated during the firing process, the liquid phase is filled into the voids, so that the magnesia-chromium refractory has the largest bulk density.

2, Permanent linear change

Due to the increase of chrome green powder, the permanent line change of magnesia-chromium refractory material first decreases and then increases, and the permanent line change rate is the smallest when the chrome green fine powder is added in the formulation of 4%.

3, Apparent porosity

After the magnesia-chromium refractory material is heated at 1500℃*3 h and high-aluminum refractory material at a temperature of 1350℃*3 h, it is obvious that the apparent porosity of the refractory after firing is significantly higher than that of the drying.

4,Bending strength

After the magnesia-chromium refractory material is heated at 1500℃*3 h and high-alumina refractory material at a temperature of 1350℃*3 h, the strength of the magnesia-chromium refractory material decreases, the structure becomes loose, and the bending strength decreases. When the amount of chrome green powder added in the formulation is 8%, the bending strength is the largest.

With the increase of the amount of chrome green micro powder, the bending strength and crushing strength of the magnesia-chrome refractory material are reduced. When the amount of chrome green micro powder is 6%, the anti-slag property of the magnesia-chromium refractory material is better. Magnesia-chromium refractories have good slag corrosion resistance, and magnesia-chromium refractories should be used as the lining of Ni-Fe alloy furnace.

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