Energy-saving circulating system for sand-to-sand heat exchange grinding

Abstract

The invention discloses a sand-to-sand heat exchange grinding energy-saving circulating system, and belongs to the technical field of material regeneration, the sand-to-sand heat exchange grinding energy-saving circulating system comprises a roasting furnace, a hot sand tank, a heat exchange grinding device and a wet sand tank, the roasting furnace performs secondary roasting on materials to form hot sand, and the hot sand is input into the heat exchange grinding device for grinding and cooling; the cooled hot sand is rinsed and concentrated to form wet sand, the wet sand is guided back to the heat exchange grinding equipment through a wet sand tank, purified tail gas generated by the roasting furnace provides waste heat for drying of the wet sand, and meanwhile, the tail gas forms airflow to drive the wet sand to move downwards so that the wet sand can exchange heat with the hot sand. By adopting the energy-saving circulating system, waste heat can be efficiently utilized, tail gas and materials are subjected to secondary roasting, and the quality of regenerated sand is excellent and uniform; and meanwhile, high-temperature waste heat of the roasted hot sand is utilized to exchange heat with the wet sand, high temperature is supplied for drying of the wet sand while the hot sand is rapidly cooled, and the utilization rate of energy is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of material regeneration, and in particular relates to an energy-saving circulation system for sand-to-sand heat-exchange grinding. Background technique [0002] Sand casting materials are cheap and easy to obtain, and are suitable for single-piece production, batch production and mass production of castings. Therefore, sand casting has become an indispensable part of the industrialized production of casting in my country. In the process of casting production, foundry sand is needed, and while new sand is continuously added, waste sand is also generated. Therefore, the regeneration and reuse of waste sand is particularly important in the sustainable development of modern industrial production, with significant application prospects and huge economic benefits. [0003] At present, the recovery and regeneration of foundry waste sand generally adopts the hot-wet method to obtain high-quality recycled sand. In...

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Problems solved by technology

The traditional recycling production line of foundry waste sand requires an additional grinding and scrubbing device, specially for grinding and scrubbing the foundry waste sand, the cost of the production line is high, and the energy consumption is relatively large; The centrifugal dehydrator is connected to the evaporator, and the evaporator needs a high-temperature supply for the drying process of the sand, but the high-temperature waste heat is wasted in the cooling process of the roasted hot sand. It is difficult to recover the heat emitted during sand cooling, which makes it difficult to effectively utilize this waste heat resource

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