Ceramsite sand for high-end casting and preparation method thereof

Abstract

The invention relates to ceramsite sand for high-end casting. The ceramsite sand is prepared from the following raw materials: waste fly ash, aluminum-containing tailing waste, bauxite and a composite additive, the composite additive comprises manganese mineral powder, clinker, iron oxide, silicon oxide and titanium oxide which are uniformly mixed in advance. The raw materials for preparing the ceramsite sand comprise the waste fly ash, the aluminum-containing tailing waste, the bauxite and the composite additive, and particularly by adding the composite additive, the performance of the ceramsite sand can be greatly improved, including: (1) high refractoriness, reduction of casting burnt-on sand and improvement of collapsibility; sand cleaning is easier; (2) the expansion rate is low, casting defects are reduced, and the size precision is improved; (3) the angular coefficient is low, the grain shape is round, and the air permeability and the surface precision of the casting are improved; (4) the strength is high, the crushing rate is low, the material can be recycled, the energy is saved, the environment is protected, and the discharge of solid wastes is reduced; and (5) the stacking density is low, the using amount of resin is reduced, and the tensile strength and the bending strength of the sand mold are improved.

Description

technical field [0001] The invention relates to the technical field of high-end foundry materials, in particular to a ceramsite sand for high-end foundry and a preparation method thereof. Background technique [0002] At present, more than 80% of castings are completed by sand casting. Foundry sand mainly includes silica sand, Japanese CB sand, etc. After the casting (3D printing) sand is mixed with the curing agent, it is sent to the powder spreader of the 3D printing equipment. After laying a layer of sand mixed with the curing agent, resin is sprayed on the laying layer, and the cycle is repeated until the completion of the product to be printed. All layers to make a 3D printed product. Due to its low refractoriness, high thermal expansion rate, and poor air permeability, silica sand can not be discharged in time due to a large amount of gas generated inside it due to strong thermal radiation, which will cause choking, resulting in defects such as pores and cold insulat...

AI Technical Summary

Problems solved by technology

[0004] In view of the above shortcomings and deficiencies of the prior art, the present invention provides a high-end casting ceramsite sand and its preparation method, which has high refractoriness, high strength, low thermal expansion rate, low angle coefficient, low broken rate, low bulk density, etc. Advantages, it solves the technical problems of low refractoriness, high thermal expansion rate and poor air permeability of existing silica sand