Unshaped refractory material and preparation method thereof

Abstract

The invention provides an unshaped refractory material and a preparation method thereof. The unshaped refractory material contains the components in parts by weight: 5-30% of magnesia particles, 5-15% of caustic-burned magnesia powder, 20-45% of corundum, 10-20% of silicon carbide, 10-18% of cokes, 6-12% of clay, 2-8% of ferro-silicon nitride, 3-10% of graphitisable coal tar pitch and 12-14 parts of a graphitisable binder which is liquid at normal temperature. The preparation method comprises the steps of mixing the magnesia particles, the caustic-burned magnesia powder, the corundum, silicon carbide, the cokes, the clay, ferro-silicon nitride and the graphitisable coal tar pitch according to a certain proportion; and then, grinding and mixing after adding the liquid graphitisable binder to obtain the unshaped refractory material.

Description

【Technical field】 [0001] The invention relates to the field of refractory materials, in particular to an unshaped refractory material and a preparation method thereof. 【Background technique】 [0002] Unshaped refractories can also be called bulk refractories. Compared with refractory bricks, they have the characteristics of simple process (saving the firing process), energy saving, low cost, and convenient mechanized construction. Among them, unshaped refractories have a very The largest use is the blast furnace taphole clay, which is widely used at present and belongs to the Al2O3-SiO2-SiC-C series material. Among them, the reasonable combination of Al2O3 and SiO2 components can react mullite at high temperature, so that the clay has good corrosion resistance and a suitable softening point under load, which is the key factor affecting the service life of the clay; SiC is a high-temperature Wear-resistant raw materials, and can prevent the oxidation of charcoal. As a raw ma...

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Problems solved by technology

Generally, tar is used as the binder of the clay, so that the clay has plastic operation performance, and can also be polycondensed and carbonized as the temperature rises, forming a carbonized network, and improving the high-temperature strength and wetting angle of the clay. However, , as long as tar is heated, it will release a large amount of benzo(a)pyrene, which is a strong carcinogen and extremely harmful to the environment and the health of the staff. At the same time, the gun clay produced by tar is easy to harden at normal temperature And difficult to adjust, poor plasticity, it is not easy to carry out mud work, affecting the workability of mud at the iron hole