Green sand regeneration and cyclic utilization process with controllable acid demand value

Abstract

The invention discloses a green sand regeneration and cyclic utilization process with a controllable acid demand value. The process comprises the following steps of collecting waste green sand, cutting and grinding the treated waste green sand, conveying the cut and ground waste green sand by a cyclone separator after grinding, collecting a small amount of metal residues in the waste green sand bya magnetic core, then collecting and smelting the small amount of metal residues, and sieving the green sand obtained through separation; weighing the total weight of the sieved green sand, weighingthe weight of brown fused alumina abrasives according to the obtained total weight of the green sand, and adding the brown fused alumina abrasives into the weighed waste green sand; putting a mixtureof the ground waste green sand and the brown fused alumina abrasives into a roasting furnace to be subjected to fluidized bed roasting; then cooling; and separating the waste green sand from the brownfused alumina abrasives to obtain a green sand reclaimed material. Therefore, the controllable acid demand value is realized by changing the content ratio of the brown fused alumina abrasives to thewaste green sand, so that resource waste is avoided.

Description

technical field [0001] The invention relates to the technical field of green mold sand recovery, in particular to a green mold sand recycling process with controllable acid consumption. Background technique [0002] Green sand is also called green sand. In foundry production, the sand mixture uses bentonite as a binder, then mixes with water and other additives, and then it can be used for molding and making cores. The sand mold (core) can be poured directly without drying. In the foundry industry, this kind of sand is called green mold sand. At present, the green sand molding process has been widely used in the auto parts production industry, but green sand will become foundry waste sand after repeated use in the system. Direct disposal of waste sand will easily cause environmental pollution, and a large amount of waste sand The generation of green mold sand also increases the production cost virtually, so green mold sand waste sand needs to be recycled, but at present, it...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a green mold sand regeneration and recycling process with controllable acid consumption, so as to solve the problem that the regenerated sand acid consumption is too high and cannot be used for casting self-hardening sand and coated sand. production problem