CO2 hardened inorganic binder and preparation method thereof

Abstract

The invention discloses a CO2 hardened inorganic binder and a preparation method thereof. The liquid binder comprises a sodium silicate solution, a potassium silicate solution, aluminum phosphate, potassium hydroxide and sodium hydroxide. A powder accelerator comprises silica fume, calcium oxide, titanium oxide, zirconium oxide, zinc oxide, yttrium oxide and graphite. The preparation method comprises the following steps: adding a sodium silicate solution, a potassium silicate solution and sodium hydroxide into a container, stirring, heating the liquid in the container, adding aluminum phosphate, continuously heating, adding potassium hydroxide, continuously stirring, cooling the liquid to the room temperature to obtain the liquid binder; and uniformly stirring silica fume, calcium oxide, titanium oxide, zirconium oxide, calcium oxide, yttrium oxide and graphite to obtain the powder accelerator. The inorganic binder is low in cost and high in environment friendliness, the organic binderenables the molding sand to be high in surface quality and good in surface stability, organic components are added, the residual strength of the molding sand is greatly reduced, the casting production of high manganese steel casting and product quality are improved, and the inorganic binder is applied to the technical field of casting.

Description

technical field [0001] The invention relates to a CO in the field of casting technology 2 Hardening inorganic binder and its preparation method, especially providing a kind of CO used in casting molding process 2 Hardened inorganic binder and method for its preparation. Background technique [0002] At present, the molding sand binders used in foundry production include organic and inorganic. Most of the organic binders are resin polymers, which cause serious pollution in the casting application process, and more irritating gases are released during the molding and pouring process. The operator causes bodily injury and seriously pollutes the environment. With the country's emphasis on environmental protection and strict control of pollution emissions in the foundry industry, inorganic binders are increasingly valued by domestic and foreign foundry counterparts. There is no harmful gas in the production, molding, and pouring processes, and the old sand can be dried. Recycl...

AI Technical Summary

Problems solved by technology

[0003] In the 1950s and 1960s, the widespread use of CO 2 The method of hardening water glass sand is used to prepare sand cores. The disadvantage of this method is that the strength of the obtained cores is low. In order to obtain high-strength sand molds, the amount of water glass added is increased. Usually, the amount of water glass added is 8.0-10.0%. Even higher, and after pouring, the residual strength of the sand mold is very high, and it is difficult to separate the casting from the sand

In the past few years, the inorganic binder and its use have been further studied and improved. The Chinese invention patent with the publication number of CN10494220A discloses a core-making process of an inorganic binder thermal curing method, and introduces a thermal curing inorganic binder water The application of glass in pearl sand can reduce the amount of inorganic binder added, and it must be cured by heating. The requirements for molds and tooling are stricter. However, there is still no good way to replace resin-based organic binders by manual or production line molding at room temperature.

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