CN103551490A - Foundry sand with good gas permeability - Google Patents

Abstract

The invention discloses foundry sand with good gas permeability. The foundry sand consists of the following components in parts by weight: 40-55 parts of river sands smashed, 4-6 parts of feldspar powder, 5-7 parts of bauxite, 2-5 parts of shrimp shell powder, 1-3 parts of saw dusts, 0.5-1 part of sodium carboxymethylcellulose, 1.5-3 parts of water glass and 8-12 parts of water. The preparation method specifically comprises the following step: 1) weighing plant ash, straw powder and tail slag micropowder in proportion. The foundry sand disclosed by the invention is free of pulverized coal and mainly take straw powder and plant ash as anti-seizing assistants so as to lower the cost and improve the surface smoothness of a casting.

Description

A kind of good permeability casting sand

Technical field

The present invention relates to casting field, particularly sand casting field.

Background technology

At present, with the foundry goods that sand casting is produced, account for 80% of total foundry goods.The Modeling Material of sand casting occupies an important position in Foundry Production, and it directly affects energy resource consumption, the environmental pollution of Foundry Production, and the quality of foundry goods, production efficiency and cost.Domestic and international widely used coal dust clay green-sand, generally by the mixed system of roughing sand, binding agent, coal dust additive etc. and water, formed, there is certain anti-scab effect and the cost of material is low, production efficiency is high, but its consumption is large, discharge is serious, at casting process coal dust firing, decompose and produce toxic gas and pollute.

Therefore coal dust clay green-sand has been not suitable with the needs of foundary industry scientific development and the Environment Protection Policy that current consumption reduction reduces discharging.So in recent years, in order to reduce the pollution of coal dust clay-bonded sand to environment, founder author managed to find suitable substitute always.

Summary of the invention

For the deficiencies in the prior art, one of object of the present invention is to provide a kind of good permeability casting sand, and this molding sand does not add coal dust, mainly take stalk powder, plant ash is antiseized auxiliary agent, to reducing costs, and improves surface finish of casting.

For achieving the above object, the technical solution used in the present invention is:

A casting sand, is comprised of the following component in weight portion: the river sand 40-55 part after pulverization process, feldspar powder 4-6 part, bauxite 5-7 part, shrimp shell meal end 2-5 part, sawdust 1-3 part, sodium carboxymethylcellulose 0.5-1 part, waterglass 1.5-3 part, water 8-12 part, concrete preparation method is, 1) by proportioning, weigh shrimp shell meal end, sawdust, sodium carboxymethylcellulose, the water that adds total amount 28-33%, soaks 3-4 hour and maintains the temperature at 120-180 ℃, obtains slurry; 2) by proportioning, weigh river sand, feldspar powder, bauxite, put into together puddle mixer and be dry mixed, mix 1-2 hour; 3) in puddle mixer, add again step 1) slurry, waterglass and remaining water, mix after 2-4 hour, shake out.

The granularity of described river sand after pulverization process is 80-100 order.

The beneficial effect of good permeability casting sand of the present invention is:

(1) molding sand of the present invention is not containing coal dust;

(2) adopting stalk powder and plant ash is antiseized auxiliary agent, and cost is low, economizes on resources;

(3), in casting process, do not produce pernicious gas poisonous, that have pollution, environmental protection;

(4) by the rational proportioning of each composition, make the molding sand quality of preparation excellent, the surface finish of casting that adopts this molding sand to produce is high.

The specific embodiment

A casting sand, is comprised of the following component in weight portion: the river sand 40-55 part after pulverization process, feldspar powder 4-6 part, bauxite 5-7 part, shrimp shell meal end 2-5 part, sawdust 1-3 part, sodium carboxymethylcellulose 0.5-1 part, waterglass 1.5-3 part, water 8-12 part, concrete preparation method is, 1) by proportioning, weigh shrimp shell meal end, sawdust, sodium carboxymethylcellulose, the water that adds total amount 28-33%, soaks 3-4 hour and maintains the temperature at 120-180 ℃, obtains slurry; 2) by proportioning, weigh river sand, feldspar powder, bauxite, put into together puddle mixer and be dry mixed, mix 1-2 hour; 3) in puddle mixer, add again step 1) slurry, waterglass and remaining water, mix after 2-4 hour, shake out.

Processing performance by good permeability casting sand of the present invention is:

Green compression strength (MPa) 0.083-0.094

Gas permeability 99

Hot green tensile strength (KPa) 305-320

Shatter index (j :) 80-83%.

Claims (2)

1. a good permeability casting sand, it is characterized in that, by the following component in weight portion, formed: the river sand 40-55 part after pulverization process, feldspar powder 4-6 part, bauxite 5-7 part, shrimp shell meal end 2-5 part, sawdust 1-3 part, sodium carboxymethylcellulose 0.5-1 part, waterglass 1.5-3 part, water 8-12 part, specifically preparation method is, 1) by proportioning, weigh shrimp shell meal end, sawdust, sodium carboxymethylcellulose, and add the water of total amount 28-33%, soak 3-4 hour and maintain the temperature at 120-180 ℃, obtaining slurry; 2) by proportioning, weigh river sand, feldspar powder, bauxite, put into together puddle mixer and be dry mixed, mix 1-2 hour; 3) in puddle mixer, add again step 1) slurry, waterglass and remaining water, mix after 2-4 hour, shake out.

2. good permeability casting sand claimed in claim 1, is characterized in that, the granularity of described river sand after pulverization process is 80-100 order.