Technology and device for recycling waste heat of electrically fused magnesia smelted block

Abstract

The invention relates to a technology and a device for recycling waste heat of an electrically fused magnesia melted block, which are characterized in that after a high-temperature magnesia melted block smelted in an electrically fused magnesia processing technique is entirely cooled in a tunnel heat exchange chamber, magnesia crystal crystallization and solidification are quickly completed, and hot air with medium-low temperature being preheated to be 200-300 DEG C is simultaneously obtained. The solidified magnesia melted block is hulled and cracked at high temperature to produce a high-temperature block. Cold air and the hot air with the medium-low temperature from the tunnel heat exchange chamber are fed into a high-temperature heat exchange tower to carry out heat exchange with the high-temperature block through a circulation air cooling method, hot air with high temperature being more than 1000 DEG C is generated to be fed into a mineral aggregate preheating tower, and magnesite is preheated to be more than 500 DEG C, so that the charging of hot materials is realized.

Description

Technical field [0001] The invention relates to the technical field of magnesite smelting electric fused magnesia, in particular to a waste heat recycling technology and device for electric fused magnesia smelting mound. Background technique [0002] The magnesium industry is a unique resource-based industry in my country, with an annual output of 15 million tons of various magnesia and products, ranking first in the world. Fused magnesia smelted with magnesite as raw material plays a pivotal role in the magnesia material industry. It is the basic raw material of many magnesite materials and has a decisive impact on the performance of the material. However, there are serious problems of high energy consumption and high pollution in smelting fused magnesia from magnesite. At present, my country's magnesite smelting is basically still using the extensive backward production technology, process and equipment in the 1970s and 1980s. Magnesite smelting and fused magnesium gener...

AI Technical Summary

Problems solved by technology

Limited by the existing technical conditions, the huge waste heat resources contained in the high-temperature magnesium smelt cannot be recycled, and a large amount of heat energy is lost in vain

[0003] Magnesium smelt has a large volume and weight, and there are factors such as poor thermal conductivity of the outer skin sand and small heat exchange area, so it is difficult to recover heat intensively. Therefore, there is no relevant research abroad on the recovery of waste heat from magnesium smelt

Some people in China used intermittent air-cooling of high-temperature magnesium clinkers in a relatively closed space to obtain high-temperature hot air to preheat the raw materials. It is difficult to obtain continuous high-temperature hot air with large flow rate, and the recovered energy is extremely limited

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