Fused forsterite and preparation method thereof

Abstract

The invention relates to fused forsterite and a preparation method thereof. The technical scheme comprises the following steps: based on mass parts, mixing 100 parts of forsterite with 2-3 parts of reducing agent; and after bailing, placing spheres in an arc furnace, carrying out melting reduction at the temperature of 1900-2200 DEG C, insulating for 2-5 hours, naturally cooling and then separating so as to obtain the fused forsterite and antaciron. In the technical scheme, the reducing agent is coke or blind coal and has a particle size less than 0.5mm; the forsterite is waste forsterite fine powder or commercial forsterite fine powder and comprises the following main chemical components by weight percent: 38-47wt% of MgO, 39-44wt% of SiO2 and 7-11wt% of Fe2O3; and the particle size of the forsterite is less than 0.5mm. According to the invention, the efficient comprehensive utilization of the forsterite fine powder is realized, and the fused forsterite is cheap in cost, simple in process, high in additional value and wide in application, and has large commercial value.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. It specifically relates to an electric fused forsterite and a preparation method thereof. Background technique [0002] Forsterite belongs to the silicate with island structure and is a kind of olivine mineral. Forsterite has high hardness, high melting point and refractoriness, and has the characteristics of non-hydration, stable chemical composition and good compatibility with other raw materials; in addition, the unique magnesium-silicon system makes it resistant to acid slag and It is resistant to alkaline slag erosion, and has no crystal form transition from room temperature to melting point, and the crystal form is stable, so it is a good constituent mineral for refractory materials. The parts where forsterite refractories are used in the iron and steel industry mainly include taphole plugging materials, tapping troughs, iron mixing cars and steel drum linings, etc.; due to i...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) the added auxiliary material dead-burned magnesia is expensive, and the addition amount is large, which greatly increases the production cost; (2) the addition of 0.5-1wt% of the antioxidant graphite electrode cannot The iron in the stone is completely reduced, let alone the reduction of silicon and the final synthesis of ferrosilicon alloy; in carbon and SiO 2 , Fe 2 o 3 In the reaction, carbon is preferentially associated with Fe 2 o 3 reaction, and then with SiO 2 Reaction, according to 7 ~ 11wt% Fe 2 o 3 content and the carbon particle combustion energy distribution coefficient is 0.7, theoretically 1.2-1.7wt% carbon is needed to completely convert the Fe in forsterite 2 o 3 If it is reduced to elemental iron, 1.6-2.4wt% of carbon needs to be added to obtain ferrosilicon alloy. Therefore, the addition of 0.5-1wt% of antioxidant in the patented technology of "magnesium crystal material production method" is too small to realize the the end result of

This method has the following problems: at high temperature, the presence of a large amount of carbon will cause SiO 2 and MgO are reduced to SiO gas and Mg vapor is volatilized, resulting in the loss of a large amount of magnesium and silicon