Green environmental-protection stemming for taphole of submerged arc furnace and preparation method thereof

Abstract

The invention particularly relates to a green environmental-protection stemming for a taphole of a submerged arc furnace and a preparation method thereof. The preparation method comprises the steps: firstly, taking 45-65 wt% of bauxite, 5-15 wt% of kyanite, 5-15 wt% of fine quartz powder, 1-3 wt% of fine andalusite powder, 10-30 wt% of alumina micro-powder, 0.5-2 wt% of montmorillonite micro-powder, 1-2 wt% of fine elementary substance silicon powder, 0.5-1 wt% of earthy graphite micro-powder and 1-2 wt% of fine Ti3SiC2 powder as raw materials, then additionally adding 0.05-0.1 wt% of polypropylene fibers, 0.05-0.3 wt% of a retarder, 0.5-2 wt% of ZrOCl2.8H2O and 8-20 wt% of an aluminum dihydrogen phosphate aqueous solution according to the raw materials, wet-grinding for 15-30 min, and then extruding and molding by a mud extruder, and thus obtaining the green environmental-protection stemming for the taphole of the submerged arc furnace. The preparation method has low cost and environmental friendliness, and the prepared green environmental-protection stemming for the taphole of the submerged arc furnace has the advantages of high strength, good volume stability, excellent washing-out resistance, excellent corrosion resistance and repairability for the taphole.

Description

technical field [0001] The invention belongs to the technical field of refractory materials for tapholes of submerged arc furnaces. In particular, it relates to a green and environment-friendly taphole clay for a submerged arc furnace taphole and a preparation method thereof. Background technique [0002] The submerged arc furnace is an electric furnace that uses the energy of an electric arc to produce ferroalloys such as ferrosilicon, ferromanganese, ferrochrome and ferronickel. The smelting process is continuous feeding, and the molten iron alloy is discharged from the taphole intermittently. The refractory material for plugging the taphole of the submerged arc furnace is gun mud. In order to meet the requirements of use, it should have the following properties: (1) Good plasticity and cohesiveness, easy to squeeze into and fill the taphole channel; (2) Suitable Excellent porosity and pore size distribution, easy to discharge moisture and gas during use; (3) Good volume...

AI Technical Summary

Problems solved by technology

In recent years, a certain amount of research work has been carried out on the formulation and performance of blasthole clay for submerged arc furnaces at home and abroad, and chromium oxide blasthole clays have been developed. , low strength, poor volume stability, poor erosion resistance, and inability to effectively repair the taphole, etc.

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

In addition, the use of chromium oxide gun mud also poses a greater threat to the health and safety of humans and animals