Ceramsite sand for casting and preparation method thereof

Abstract

The invention relates to a ceramsite sand for casting and a preparation method thereof. The ceramsite sand comprises the following chemical components in parts by weight: 35-65 parts of silicon dioxide, 30-50 parts of aluminum oxide, 1-10 parts of iron oxide, 1-4 parts of manganese dioxide and 2-8 parts of chromic oxide. The method comprises the following steps: performing grinding, and detecting the chemical composition and contents of the raw materials; and sequentially performing proportioning, ball making, screening, sintering and grading to obtain the finished product. The ceramsite sand prepared by the invention is high in thermal conductivity and refractoriness, conforms to the requirements for casting sand, can be used for casting and casting mold production instead of silica sand, chromite sand and the like, reduces the discharge amount of solid waste in the casting industry, and improves the quality of cast products.

Description

technical field [0001] The invention relates to the fields of sintered ceramsite and casting, in particular to a ceramsite sand for casting and a preparation method thereof. Background technique [0002] The foundry industry belongs to the national basic industry. The commonly used sand for casting is mainly silica sand, chromite sand, zircon sand, pearl sand, and ceramsite sand. Silica sand is rich in resources, but it is severely pulverized during use, and the solid waste discharge is huge. The high content of silica dust in the workshop leads to a high incidence of silicosis among workers. Chromite sand and zircon sand resources are scarce, expensive, low regeneration rate, high cost of use, and can only be used as special sand. Although pearl sand and ceramsite sand have high strength and wear resistance, they can reduce solid waste emissions and reduce workshop dust, and their low thermal expansion coefficient can eliminate casting vein defects, but when they are used ...

AI Technical Summary

Problems solved by technology

Silica sand is rich in resources, but it is severely pulverized during use, the discharge of solid waste is huge, and the high content of silica dust in the workshop leads to a high incidence of silicosis among workers

Chromite sand and zircon sand resources are scarce, expensive, low regeneration rate, high cost of use, and can only be used as special sand

Although pearl sand and ceramsite sand have high strength and wear resistance, they can reduce solid waste discharge and reduce workshop dust, and their low thermal expansion coefficient can eliminate casting vein defects, but when they are used as casting sand, they have low thermal conductivity. , the specific heat capacity is large, which leads to a significant decrease in the cooling speed of the casting, which seriously affects the performance and quality of the casting. It is only suitable for the production of small castings such as coated sand, and cannot be popularized and applied in large quantities.

For example, the patent document whose publication number is CN105344919A discloses a kind of ceramsite sand for casting. The content of aluminum is significantly lower than that of the ceramsite sand used in the prior art. At the same time, the refractoriness of the ceramsite sand is lower than that of ordinary ceramsite sand. The method of reducing the production cost and the refractoriness of ceramsite sand by using the content of aluminum oxide in the sand can not be widely used in the foundry industry, because in actual production, in order to avoid the occurrence of sticky sand defects, the foundry sand requires high refractoriness Therefore, how to design a kind of high thermal conductivity and refractoriness foundry sand has become a technical problem to be solved urgently in this field