Method for integrally pouring mixer furnace

Abstract

The invention provides a method for integrally pouring a mixer furnace. The method comprises the following steps: (1) adopting pouring materials of different varieties (three varieties together) for different original parts, namely a furnace bottom, a furnace body (a slag line and a tapping spout) and a furnace top respectively, wherein the technique of the invention reduces the pouring materialsto one variety and the pouring materials comprise the following components in percentage by weight: 80-94% of Al2O3 and 6-20% of SiC; (2) optimizing and adjusting a roasting system comprising a heating curve, a heating speed, heat-preservation time, total roasting time and the like; and (3) solving a maintenance technique of key parts comprising the tapping spout and the slag line which influencethe service life of the mixer furnace after inside lining pouring materials are simplified. In the roasting technology, the heating speed needs to be controlled at 15+ / -2 DEG C / hour at each heating stage before the temperature of 450 DEG C, otherwise, a condition that water in the inside lining pouring materials is not removed in time to cause collapse can occur. After the temperature of 750 DEG C, the heating speed can be controlled according to an upper limit of 50 DEG C / hour, and the pouring materials can be directly put into use and operation after being directly heated to a maximum temperature (about 1,250 DEG C).

Description

technical field [0001] The invention relates to an integral pouring method for an iron mixing furnace, which is applied to the field of integral pouring of the inner lining of an iron mixing furnace in a steelmaking plant. Background technique [0002] Before 2002, refractory brick masonry was used for the lining of the mixed iron furnace. The disadvantages are long maintenance period, low service life of the mixed iron furnace and high comprehensive cost. Later, the practice of changing from brickwork to integral pouring gradually appeared. The overall pouring process is based on the working conditions and conditions of the furnace bottom, furnace body (slag line and tap nozzle), furnace roof and other parts in the selection of furnace lining castables. Depending on the requirements of use, different castables are selected. For example, the bottom of the mixed iron furnace is soaked and covered by molten iron for a long time during the normal production process, and is sub...

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Problems solved by technology

[0002] Before 2002, refractory brick masonry was used to repair the lining of the mixed iron furnace. The disadvantages are long maintenance period, low service life of the mixed iron furnace and high comprehensive cost.

However, further practice has gradually revealed some defects of this process: first, various castables with different properties are stored in a narrow construction site during construction, which is easy to cause confusion and misuse; second, different parts need to be poured with different materials, It makes the mixing of materials more difficult, prolongs the pouring time, and the maintenance period is not reduced but increased compared with brickwork; the third is that different materials have different creep properties and linear change rate characteristics, which increases the difficulty of baking and prolongs the baking time. Well, there will be lining burst

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