Sand burning preventing coal dust free green sand for casting and preparation method thereof

Abstract

The invention relates to a sand burning preventing coal dust free green sand for casting and preparation method thereof. The green sand contains 50-90% of naturally clay-bonded sand, 2-40% of sand burning preventing assistant and 2.5-20% of water by weight percent; the preparation method includes that the naturally clay-bonded sand and the sand burning preventing assistant are mixed in a sand mixing machine and the water is added for mixing to uniform. The green sand of the invention contains no coal dust and can be recycled; the casting mould made by the green sand of the invention is utilized to produce castings, crude sand consumption is low, the surface of casting is not burning-on, surface quality is high, no coal dust is required to add, recycling of moulding sand is good, environmental protection is less, and high temperature mould dismantling improves productivity.

Description

technical field [0001] The invention belongs to the field of green molding sand and its preparation, and in particular relates to a non-coal dust green molding sand for anti-sticking sand casting and a preparation method thereof. Background technique [0002] At present, the castings produced by sand casting account for 80% of the total castings. The molding material of sand casting plays an important role in casting production, which directly affects the energy consumption, environmental pollution, and casting quality, production efficiency and cost of casting production. Coal powder clay green sand, which is widely used at home and abroad, is generally made of raw sand, binders, coal powder additives, etc. and water. It has a certain anti-sticking sand effect, low material cost, and high production efficiency. However, its consumption is large, the emission is serious, and the coal powder is burned and decomposed in the casting process to produce toxic gas pollution. [...

AI Technical Summary

Problems solved by technology

With the increasingly serious energy crisis, if you continue to use coal powder in green sand, you will face the danger of being intercepted

(2) Due to the low generation rate of bright carbon in pulverized coal

Moreover, the accumulation of a large amount of ash in the molding sand will lead to a decrease in the air permeability of the molding sand and an increase in water content.

When coal powder sand is recycled, the ash content increases rapidly, and a large amount of new sand needs to be added to ensure that other properties of the molding sand do not decrease, which in turn increases the cost of castings

(4) Since pulverized coal is a black powder, it is dusty from processing, transportation, storage to the whole production process, which seriously deteriorates environmental sanitation

Although some positive effects have been obtained, the proportion of these pulverized coal substitutes is still very small due to reasons such as high prices and scarce sources.