Low-aluminum mullite castable for molybdenum-containing waste liquid incinerator and preparation method of low-aluminum mullite castable

The invention discloses a low-aluminum mullite castable for a molybdenum-containing waste liquid incinerator and a preparation method of the low-aluminum mullite castable, and the low-aluminum mullite castable comprises the following components in percentage by mass: 11-25% of 5-3mm mullite, 10-20% of 3-1mm mullite, 5-15% of less than 1mm mullite, 6-18% of compact low-aluminum mullite, 3-8% of pyrophyllite, 5-10% of coal series kaolin, 6-15% of polycrystalline silicon waste, 5-12% of kyanite, 3-9% of alpha-alumina micro powder and 4-8% of zirconium-containing silica fume. 1-5% of lubricant and 1-5% of metal silicon powder; the total mass of the raw materials is 5-10% of the binding agent, 0.5-4% of the hardening accelerator, 0.3-0.5% of the dispersing agent and 2-6% of water. The mullite castable disclosed by the invention is relatively low in aluminum oxide content, high in mullite content and almost free of corundum phase, and the main crystal phase is a glass phase except the mullite phase, so that the mul