A mixed regeneration method of inorganic sand and organic sand and its regenerated sand

Abstract

The invention relates to an inorganic sand and organic sand mixing regeneration method. Through primary mechanical regeneration, hot regeneration and secondary mechanical regeneration, an inorganic film on the surface of inorganic sand can be fully crushed and stripped; in the hot regeneration process, an organic resin film is fully combusted to provide more uniform heat source energy for mixing regeneration, so that the regeneration energy consumption is reduced, and the embrittlement of an inorganic bonding agent on the surface of the inorganic sand is facilitated; and through two times of mechanical regeneration, covering matters on the surface of the inorganic sand are removed more thoroughly. The recovery rate of regenerated sand in the regeneration method is high up to reach 80-95%, and is far higher than the regeneration rate of below 50% in a general drying method; and the regeneration method is simple in process and equipment, free of secondary environment pollution, suitable for industrial production demands and higher in economical and social values. The performances of the regenerated sand obtained by the regeneration method are near the performances of new sand, and are excellent, so that the regenerated sand can directly serve as facing sand.

Description

technical field [0001] The invention relates to a mixed regeneration method of inorganic sand and organic sand and the regenerated sand, belonging to the technical field of casting molding materials. Background technique [0002] The existing regeneration methods of inorganic sand include wet method, dry method, thermal method + mechanical method, chemical method and combined regeneration method, etc. The recovery rate of wet regeneration is high, and the performance index of recycled sand obtained by wet method is basically close to that of new sand, which can replace new sand as surface sand and single sand, so it is widely used in the inorganic sand recycling industry. The equipment system is complex and needs to be processed through steps such as filtration, water washing, drying and airflow cooling. It occupies a large area and consumes a lot of energy, and a large amount of waste water must be purified before it can be discharged, otherwise it will cause serious pollut...

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Problems solved by technology

The recovery rate of wet regeneration is high, and the performance index of recycled sand obtained by wet method is basically close to that of new sand, which can replace new sand as surface sand and single sand, so it is widely used in the inorganic sand recycling industry. The equipment system is complex and needs to be processed through steps such as filtration, water washing, drying and airflow cooling. It occupies a large area and consumes a lot of energy, and a large amount of waste water must be purified before it can be discharged, otherwise it will cause serious pollution to the environment; dry regeneration The equipment and system layout is simple, but the regeneration recovery rate is low, only 20%-30%. The processes include wet + dry combined regeneration, thermal + mechanical combined regeneration, thermal + wet combined regeneration and chemical + mechanical combined regeneration, etc., which can improve the process and complex equipment of single wet method to a certain extent. And the problem of environmental pollution, or the problem of low regeneration recovery rate of dry method and thermal method, but the regeneration production of inorganic sand still has a lot of problems of high energy consumption or heavy pollution or low regeneration recovery rate and poor quality of recycled sand