A kind of metal mold environmental protection coating for carbon-iron alloy casting and preparation process thereof

Abstract

The invention relates to the technical field of coating, in particular to metal mold environment-friendly coating for carbon ferroalloy casting based on oxidation-reduction reaction and a preparationprocess thereof. The environment-friendly coating comprises, by weight, 0.1-30 parts of limestone powder, 0.1-30 parts of dolomite powder, 0-30 parts of magnesite powder, 0-30 parts of ferrochrome dust removal powder, 0-30 parts of manganese alloy dust removal powder, 0.1-20 parts of silica powder, 0.1-10 parts of pulverized coal and 0-10 parts of asphalt powder. The preparation process comprisesthe steps of grinding limestone powder and dolomite powder, diluting a Na2SiO3 aqueous solution, and conducting stirring, testing, tinning, and packaging. The environment-friendly coating is mainly used for the metal mould casting of ferroalloy with low carbon requirements, such as high carbon ferrochrome, high carbon ferromanganese and manganese silicon alloys, and the problems that a mold is stuck and the damage to the mold is serious in casting of the alloys are solved; and the preparation process is high in production efficiency and facilitates large-scale production.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to an environment-friendly coating for metal molds used for carbon iron alloy casting and a preparation process thereof. Background technique [0002] At present, most of the ingots produced in the domestic iron and steel metallurgy, non-ferrous metals and mechanical casting industries are to cast liquid metal into steel ingot molds to obtain various ingots of different sizes. In actual production, lime water is often used to coat the surface of the ingot. However, this method has the following disadvantages: 1. The coating cannot be applied. When the mold temperature is higher than 150°C, the water will immediately turn into a small ball when it touches the mold wall, and roll down to the bottom of the mold with the powder; 2. The coating has no bonding force with the mold wall. With the evaporation of water in the paint, the lime powder becomes non-sticky monomeric tiny particle...

AI Technical Summary

Problems solved by technology

In actual production, lime water is often used to coat the surface of the ingot. However, this method has the following disadvantages: 1. The coating cannot be applied

With the evaporation of water in the paint, the lime powder becomes non-sticky monomeric tiny particles, which are easy to fall off from the mold wall before casting, and the lime powder concentrated on the large plane also goes with the slag during casting. Floating together, it will not protect the mold; 3. The amount of paint is large, and the loss of the ingot mold is serious

Since the bonding force with the mold wall tends to be zero, the dosage has to be increased to form a thick layer of powder at the bottom of the ingot mold to isolate the liquid ferroalloy from the bottom of the mold and play a role in demoulding; because a large amount of water paint is used, the ingot The mold is subjected to chilling effect, it is very easy to crack or deform, and the loss is serious. Even if the dosage is increased, the problem of hanging powder on the wall of the vertical mold cannot be solved; 4. The environment is seriously polluted

During the casting process, lime powder will quickly spread to the workshop with the heat wave, forming high-concentration dust-containing waste gas and discharging it into the atmosphere, which is extremely harmful to the health of operators and has a serious impact on the environment; 5. The protection of molds Single mechanism, poor effect

In addition to the fact that the mold wall cannot be hung with powder and cannot protect the ingot mold, the powder on the bottom plane of the mold only protects the mold by physical isolation, so the effect is not good.

Images