a co 2 Hardening inorganic binder and method for its preparation

Abstract

a CO 2 The hardening inorganic binder and its preparation method, the liquid binder includes sodium silicate solution, potassium silicate solution, aluminum phosphate, potassium hydroxide, sodium hydroxide. Powder accelerators include silica fume, calcium oxide, titanium oxide, zirconium oxide, zinc oxide, yttrium oxide, and graphite. First add sodium silicate solution, potassium silicate solution and sodium hydroxide into the container for stirring, heat the liquid in the container, add aluminum phosphate, continue heating, add potassium hydroxide, continue stirring, wait for the liquid to cool to room temperature, A liquid binder is prepared. Mix silica fume, calcium oxide, titanium oxide, zirconium oxide, calcium oxide, yttrium oxide, and graphite evenly to obtain a powder accelerator. The inorganic binder of this invention has low cost and strong environmental protection. The organic binder makes the surface quality of the molding sand high and the surface stability of the molding sand is good. The addition of organic components can greatly reduce the residual strength of the molding sand. It is suitable for the casting production of high manganese steel castings. Product quality, used in the field of foundry technology.

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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