Blast furnace-intermediate frequency furnace duplexing smelting short process production technology

Abstract

The invention provides a short flow manufacturing technique for the duplex smelting of a blast furnace-intermediate frequency furnace, relating to the blast furnace-intermediate frequency sensing electric stove smelting technique. The short flow manufacturing technique is characterized in that the liquid iron produced by an ironmaking blast furnace is directly added into the intermediate frequency sensing electric stove, the temperature is increased to adjust materials, and a cast piece is poured. In the material adjusting process, a liquid iron nucleating agent is added to accelerate the crystallization. The nucleating agent comprises the compositions in weight percentage: 65 to 70 percent of silicon, 0.5 to 2.5 percent of calcium, 0.0 to 6.0 percent of barium, 0.2 to 2.0 percent of aluminum, 0.05 to 0.2 percent of bismuth, and the balancing being iron. The short flow manufacturing technique has the advantages that the process of melting iron ingot for the second time is saved, the overheating efficiency of the sensing electric stove is high, the adjustment of components and the control of the temperature are convenient, the high temperature liquid iron which has good quality and meets the requirement for the cast piece is obtained; and the technique can be applied to spheroidal graphite casting to produce parts of an automobile, parts of wind power equipment, engineering plant cast pieces and other cast pieces, the product quality is improved, the energy is saved, the production efficiency and the production benefits are improved, and the environmental pollution is reduced.

Description

Technical field: [0001] The invention relates to the smelting technology of the foundry industry, and further relates to the dual smelting technology of blast furnace-intermediate frequency induction furnace, especially the production technology of dual blast furnace-intermediate frequency induction furnace for the production of nodular castings. Background technique: [0002] At present, the usual process of my country's foundry industry is as follows: sand treatment→molding machine molding or resin sand molding→casting pouring→casting cooling→cleaning→heat treatment→rust treatment→blank inspection→blank warehousing→machining→finished product inspection→warehousing . Among them, there are molten iron smelting and treatment processes before the castings are poured, and the conventional casting pouring process is: a raw material is made into molten iron in a blast furnace, then cooled to form an iron ingot, and then the molten iron is cast in a cupola furnace, and then poured ...

AI Technical Summary

Problems solved by technology

These two processes have the following problems: smelting, melting, cooling and remelting, long process, waste of energy, pollution of the environment, and low equipment production efficiency