Slag hardening and tempering compound furnace and operation process thereof

Abstract

A slag hardening and tempering compound furnace comprises an electric-arc furnace and an electric melting furnace arranged below the right side of the electric-arc furnace, and the electric-arc furnace and the electric melting furnace are communicated through a groove which tilts downwards. The electric-arc furnace is vertically arranged, a round furnace cavity is arranged in the electric-arc furnace, the top of the furnace cavity is an open end, a movable furnace cover covers the opening, and the vertical side wall and the horizontal bottom wall of the electric-arc furnace are connected through chamfers. A furnace cavity of the electric melting furnace is transversely arranged and in a long strip shape and comprises a left mixing chamber and a right homogenizing chamber which are independent, the mixing chamber and the homogenizing chamber are separated through a separation wall, a melt passing hole is formed in the bottom portion of the separation wall to enable the mixing chamber and the homogenizing chamber to be communicated, a melt discharging opening is formed at the bottom of the right end of the homogenizing chamber, a heating molybdenum electrode is arranged above the melt discharging opening, and a blocking wall is arranged close to the melt discharging opening, at the bottom of the homogenizing chamber, protrudes upwards and is parallel to the separation wall. Compared with a traditional cupola furnace technology, energy consumption is low, and pollution is low. Compared with a double-electric-arc-furnace hardening and tempering technology, hardening and tempering products are mixed adequately, stewing homogenizing is complete, discharging flow is stable, and machining in the next process can be benefited.

Description

technical field [0001] The invention relates to the tempering treatment of molten slag, in particular to a conditioning device for hot molten slag and its operating process. Background technique [0002] The metallurgical industry discharges a large amount of hot slag every year, such as ironmaking slag, steelmaking slag, ferroalloy slag, non-ferrous smelting slag, liquid slag discharged from cyclone combustion chamber of power plant, etc. These hot slags are generally quenched or cooled naturally, and then used as raw materials for the production of mineral wool board products. Considering the quality requirements of mineral wool board products on the melt, it is necessary to add a certain proportion of quenching and tempering raw materials to the slag, so as to change the properties such as the acidity coefficient of the slag to improve the grade of the product. The newly added quenching and tempering raw materials are mainly Mainly acidic granular materials such as quart...

AI Technical Summary

Problems solved by technology

However, the double electric arc furnace adopts intermittent operation, and the transportation of the melt between the electric arc furnaces is completed in the form of dumping. It is difficult for the melt to mix fully in the second electric arc furnace, and because the melt is liquid Large surface fluctuations, resulting in large changes in the flow rate of melt discharge; during the process of cross-furnace dumping, a large number of bubbles will be generated in the melt, and the bubbles will lead to aggravation of large fluctuations in melt discharge flow

In addition, due to the short residence time of the melt in the electric arc furnace and insufficient mixing in the double electric arc furnace process, the homogenization effect before the melt discharge cannot meet the production requirements of the subsequent process, so the promotion is limited

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