Sintering technology for quartz sand furnace lining of induction electric furnace of 1t or below

Abstract

The invention discloses a sintering technology for a quartz sand furnace lining of an induction electric furnace of 1t or below. The sintering technology comprises the following steps that firstly, burden is heated to 875 DEG C-1,100 DEG C at the average temperature rise speed of 300 DEG C / h, and heat preservation is conducted for 4 h; secondly, the burden is melted at the average temperature risespeed of 250 DEG C / h, the temperature of molten iron is increased to 1,500 DEG C-1,560 DEG C, and heat preservation is conducted for 2h; thirdly, the temperature of the molten iron is reduced to 1,400 DEG C to 1,450 DEG C, and heat preservation and curing are conducted for 1h; fourthly, after the furnace lining is sintered, according to the burden adding manner during daily smelting, three wastesteel press blocks are added, then a carburant is added, and the rest of waste steel press blocks are added for supplementary. The total consumed time of the sintering technology is about 12.5 h, andcompared with the previous sintering technology consuming 18 h and the burden adding manner, the sintering efficiency is improved by 31%, and the service life of the furnace lining is prolonged by 40%. The sintering technology is applied to the casting field, and a practical basis is provided for further improving and enhancing of the sintering technology for the quartz sand furnace lining of theinduction electric furnace.

Description

technical field [0001] The invention belongs to the technical field of casting, and relates to a sintering process of a quartz sand furnace lining, in particular to a sintering process of a quartz sand furnace lining of an induction electric furnace below 1 ton. Background technique [0002] The quartz sand furnace lining sintering process given by domestic and foreign quartz sand manufacturers is generally: [0003] (1) Heat the charge (scrap steel briquettes + recarburizer) to 875~100°C at an average heating rate of 100°C / h, and keep it warm for 2 hours. [0004] (2) The charge is melted at an average heating rate of 100°C / h, and the scrap steel briquette and carburant are mixed and melted to form molten iron. [0005] (3) Raise the temperature of molten iron to 1500~1560°C at a heating rate of no more than 200°C / h, and keep it warm for 2 hours. The sintering process takes about 18 hours in total. The sintering process is as follows: figure 1 shown. [0006] (4) After t...

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the problems of long sintering process of the existing quartz sand lining, short service life of the lining, and poor operability, the present invention provides a sintering process of the quartz sand lining of an induction furnace below 1 ton, which is fast, operable and effective. Can significantly improve the service life and work efficiency of the furnace lining

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