Stemming for taphole of ore hearth and preparation method thereof

Abstract

The invention relates to stemming for a taphole of an ore hearth and a preparation method thereof. The technical scheme adopted by the stemming disclosed by the invention lies in that the preparation method comprises the following steps of: firstly using 40-60wt% of bauxite, 5-15wt% of kyanite, 10-20wt% of brown fused alumina fine powder, 5-15wt% of chromium oxide fine powder, 5-15wt% of silicon carbide fine powder, 5-10wt% of silicon micro powder, 1-5wt% of titanium oxide fine powder, 1-3wt% of cerium oxide fine powder, 1-3wt% of bentonite fine powder and 1-5wt% of Al2O3/Si2N2O/SiC/C composite powder as raw materials, additionally adding an oxide additive accounting for 1-5wt% of the raw materials, and pre-mixing the raw materials and the oxide additive for 5-10 minutes in a mixing and grinding machine so as to obtain premix powder; and then adding a retarder accounting for 0.05-0.25wt% of the raw materials and an aluminum dihydrogen phosphate aqueous solution accounting for 7-15wt% of the raw materials to the premix powder, grinding the premix powder, the retarder and the aluminum dihydrogen phosphate aqueous solution for 20-30 minutes in a wet manner, and then performing stemming extrusion and shaping through a stemming extruder so as to obtain the stemming for the taphole of the ore hearth. The stemming for the taphole of the ore hearth prepared by the preparation method disclosed by the invention has the characteristics of being low in cost, high in intensity, excellent in washing resistance and excellent in corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of taphole clay. In particular, it relates to a taphole clay for a submerged arc furnace and a preparation method thereof. Background technique [0002] Submerged Arc Furnace, also known as electric arc furnace or resistance electric furnace, uses the energy of electric arc to smelt metal, mainly producing ferro-silicon, ferro-manganese, ferro-chromium and ferro-nickel alloys and other ferroalloys. During the smelting process, feed materials are added successively, and the iron slag is intermittently discharged. After the smelting is completed, the molten ferroalloy is released from the tap hole. Taphole clay is a kind of refractory material used to block the taphole of submerged arc furnace. In order to meet the use requirements, the taphole clay for submerged arc furnace should have the following properties: (1) Good plasticity and cohesiveness, easy to squeeze (2) Appropriate porosity, easy to discharge...

AI Technical Summary

Problems solved by technology

At present, there are generally problems such as low strength, poor erosion resistance and erosion resistance in the clay used in submerged arc furnaces.

Since the taphole of the submerged arc furnace has to be opened and filled several times a day, if the above-mentioned problems exist in the quality of the taphole mud, the hot molten iron and slag will have the effect of scouring and eroding the taphole taphole, and problems will occur during use. Reaming will occur in the iron hole, resulting in shallower iron hole, unstable iron flow, and unclean iron, which seriously affects normal production, and ultimately affects the service life and smelting output of the submerged arc furnace