Clay completely-regenerated sand modifier, modification method and application of modifier

Abstract

The invention discloses a clay completely regenerated sand modifier, a modification method and an application of the modifier, wherein the modifier is 0.05-5mol / L hydrochloric acid. The modification method comprises the following steps of: (1) adding the modifier into the clay completely-regenerated sand, wherein the modifier accounts for 2 to 10% of the total mass of the clay completely regenerated sand; (2) mixing the modifier and the clay completely-regenerated sand uniformly, then placing statically for 1 to 6 minutes; and (3) drying a mixture which is placed statically until the moisture content of the mixture is less than 0.2%. The modified clay completely-regenerated sand can be used for mixing coated sand, hot core-box sand and cold core-box sand. The modification method has the following advantages of having convenience in using, not only lowering the acid consumption value of the clay completely regenerated sand, but also enhancing the tensile strength of mixed sand by the modification method, and improving the casting process performances of the clay completely regenerated sand by adding the modifier.

Description

[0001] technical field [0002] The invention relates to the casting process performance of completely regenerated clay sand, in particular to a modifier for completely regenerated clay sand, a modification method and the application of the modifier. [0003] Background technique [0004] Machinery manufacturing industry is the pillar industry of our country, and casting is the basic industry of machinery manufacturing industry. The molds used in foundry production are mainly sand molds, ceramic molds, metal molds, plaster molds, etc. Among them, the castings produced by sand casting account for more than 80% of the total output of castings. Sand casting can be divided into clay sand casting, resin sand casting and water glass sand casting according to the different binders used. The clay sand production process has become the most commonly used casting production process in the sand casting method because of its cheap and easy-to-obtain raw materials, easy handling, stron...

AI Technical Summary

Problems solved by technology

This part of the discharged clay and old sand cannot be used for foundry production again without regeneration treatment, and can only be treated as solid waste, which not only causes waste of natural resources, but also causes environmental pollution