Precise casing and shell-manufacturing method for sodium silicate

Abstract

The invention discloses a precise casing and shell-manufacturing method for sodium silicate, which specifically comprises the following steps of: configuring and using a hardening agent by the following components by weight: 18-20 parts of ammonium chloride, 3-5 parts of hydrochloric acid and 100 parts of water; firstly, putting 100 parts of water into a hardening pool; then putting 18-20 parts of ammonium chloride powder into water; after the ammonium chloride powder is fully dissolved, slowly injecting weighed 3-5 parts of hydrochloric acid; in the hydrochloric acid injection process, monitoring the current intensity of the solution by a hardening status instrument; when the current reaches 150 milliamperes, stopping injecting into the hardening pool; and then, hardening a casting shell into the hardening pool to finish shell manufacture. According to the precise casing and shell-manufacturing method for sodium silicate, ammonia generated in the shell manufacture process can be fully utilized to improve the working environment, and meanwhile, ammonium chloride can be generated in the shell-manufacturing process so as to reduce the use amount of the ammonium chloride.

Description

technical field [0001] The invention belongs to the foundry industry, and in particular relates to a method for making a shell by precision casting, in particular to a method for making a shell by precision casting of water glass. Background technique [0002] In the casting industry, especially in the water glass casting industry, the shell is usually hardened by magnesium chloride, aluminum chloride and ammonium chloride aqueous solution. Among these three shell-making processes, although the magnesium chloride and aluminum chloride aqueous solutions generate less ammonia gas during use, their hardening effect is poor, the yield and quality of casting products are low, and the problem of difficult cleaning after curing is very serious. Obviously, it is rarely used in the industry; ammonium chloride aqueous solution is the most widely used hardening agent for shell making in water glass casting. No matter whether magnesium chloride or aluminum chloride is used, the first la...

AI Technical Summary

Problems solved by technology

Among these three shell-making processes, although the magnesium chloride and aluminum chloride aqueous solutions generate less ammonia gas during use, their hardening effect is poor, the yield and quality of casting products are low, and the problem of difficult cleaning after curing is very serious. Obviously, it is rarely used in the industry; ammonium chloride aqueous solution is the most widely used hardening agent for shell making in water glass casting. No matter whether magnesium chloride or aluminum chloride is used, the first shell is inseparable from ammonium chloride.

But make a general survey of the hardened shell-making process of existing ammonium chloride, it mainly exists in the shell-making process and can produce a large amount of ammonia gas, and this ammonia gas is serious to the health injury of operator, and also serious to the corrosion of equipment simultaneously; The ammonium chloride hardening shell making process still has the problem of high energy consumption

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