CN104841851A - Environment-friendly energy-saving sand and production method thereof - Google Patents

Abstract

environment-friendly energy-saving sand is produced through materials of, by weight part, 6 to 8 of expanded perlite, 4 to 5 of concrete residue, 0.3 to 0.6 of sodium hexametaphosphate, 10 to 15 of sodium hydroxide solutions, 4 to 5 of lithium chinastone, 15 to 20 of new silica sand, 4 to 5 of magnesia, 0.6 to 0.9 of corncob powder, 1.2 to 1.8 of zirconia ceramic microbeads, 25 to 30 of used sand, 4 to 5 of modified pulverized coal and 4 to 5 of water. The concrete residue is used, alkali activation treatment is performed, and accordingly, the lubricity, the plasticity and the wet strength of sand are increased; the expanded perlite and the corncob powder are used, and accordingly, the yielding property, the air permeability and the collapsibility of the sane are increased, but the strength is not reduced; the magnesia is used as hardeners, so that pollution to the air is little; the modified pulverized coal contains lots of volatiles and small ash content and is uniform in particle and good in mobility, and accordingly, the casting brightness is improved, 8% to 12% of pores and sand inclusion defects are reduced, and the collapsibility is improved.

Description

A kind of environmental protection and energy saving molding sand and preparation method thereof

Technical field

The present invention relates to casting field, particularly relate to a kind of environmental protection and energy saving molding sand and preparation method thereof.

Background technology

So-called foundry clay green-sand, refers to by roughing sand, binding agent and conforms to thing and coordinate by a certain percentage, through overmulling system, meeting the compound of modeling requirement.Because clay green-sand casting material therefor is cheap and easy to get, casting mold is simple and convenient, and all can adapt to the single-piece production of foundry goods, in batch a large amount of production, for a long time, be the basic technology of Foundry Production always.

Molding sand will have following characteristic: 1, good permeability, and after high-temperature metal liquid cast-iron pours into casting mold, producing gas must discharge smoothly in casting mold; 2, good intensity, ensures that molding sand must possess sufficiently high intensity and deformability; 3, there is good fire resistance, the integrality 4 of thermal effect at high temperature sand mold, safe and reliable, simple to operate, easy construction can be resisted, the reduction of erection time; 5, heat endurance, mobility, plasticity, compact rate of molding are good.

Existing foundry goods also exists a lot of problem, the such as phenomenon such as buckle, sand washing, drop, sweat, pore, pin hole, shrinkage cavity and porosity, loose, crackle, scab, scab, rough surface, elephant skin, shrinkage depression, this all has very large relation with molding sand, need the performance constantly improving molding sand, can improve from raw material and sand mulling craft.

In addition, coal dust is added in foundry goods green-sand, scab defect can be prevented, improve the surface smoothness of foundry goods, and burning into sand defect can be reduced, improve the defeated and dispersed function of molding sand, for wet type G. Iron Castings, effectively can also prevent subcutaneous blowhole, available circular vortex burner, air is without preheating.The size of pulverized coal particle, shape, mobility, phosphorus content, volatile matter number, ash content content determine the performance quality of foundry goods, the quality of foundry goods can be improved by the performance improving coal dust.

Summary of the invention

The object of the present invention is to provide a kind of environmental protection and energy saving molding sand and preparation method thereof, this molding sand lubricity, plasticity are good and wet strength is high, little to air pollution.

Technical scheme of the present invention is as follows:

A kind of environmental protection and energy saving molding sand, is characterized in that being made up of the raw material of following weight portion: expanded perlite 6-8, concrete waste residue 4-5, calgon 0.3-0.6,1% sodium hydroxide solution 10-15, lithium porcelain stone 4-5, new silica sand 15-20, magnesia 4-5, maize cob meal 0.6-0.9, zirconia ceramics microballon 1.2-1.8, old sand 25-30, modification coal dust 4-5, water 4-5;

Described modification coal dust is made up of the raw material of following weight portion: brown coal powder 3-4, sorbierite 0.05-0.08, blue charcoal 0.5-0.8, methyl alcohol 0.3-0.5, potassium chlorate 0.1-0.2, potash 0.2-0.3, iron chloride 0.01-0.02, lime 0.02-0.03, calcium acetate 0.1-0.2, antimony trisulfide 0.2-0.3, Tween 80 0.04-0.08, water 2-2.5; Preparation method is: by brown coal powder and the mixing of blue charcoal, be crushed to particle diameter and be less than 100 μm, obtain powder; Tween 80, sorbierite are added to the water, stir, add potassium chlorate, potash, iron chloride, calcium acetate again, after stirring, add described powder, be ground to grain diameter and be less than 40 μm, spraying dry, spray methyl alcohol while stirring again, grinding 10-15 minute, then mix with other residual components, sealing, to obtain final product.

The preparation method of described environmental protection and energy saving molding sand, is characterized in that comprising the following steps:

(1) new silica sand, lithium porcelain stone and old sand are mixed, sieve, obtain the sand of particle diameter at 0.3-1.2mm, add in simpson mill together with maize cob meal, mixing 15-20 minute, then add the water of 40%, mixing 4-6 minute, obtains mixed sand;

(2) expanded perlite, concrete waste ground-slag are broken to particle diameter and are less than 1.2mm, then be mixed and heated to 80-90 DEG C with 1% sodium hydroxide solution, stir 20-30 minute, dry, obtain particle;

(3) particle (2) step obtained and other residual components join in the puddle mixer in (1) step, and evenly do not add remaining water to spray shape under halt condition, wet mixing 6-8 minute, to obtain final product.

Beneficial effect of the present invention

Molding sand of the present invention, by using concrete waste residue, through alkali-activated carbonatite process, adds the lubricity of molding sand, plasticity and wet strength, has saved the energy; By using expanded perlite and maize cob meal, adding the deformability of molding sand, gas permeability, collapsibility, not reducing intensity again; By using magnesia to do curing agent, little to air pollution; Modification coal dust of the present invention, volatile matter is many, and ash content is few, uniform particles, good fluidity, adds the bright property of foundry goods, decreases the pore of 8-12%, burning into sand defect, improves collapsibility.

Detailed description of the invention

A kind of environmental protection and energy saving molding sand, is made up of the raw material of following weight portion (kilogram): expanded perlite 7, concrete waste residue 4.5, calgon 0.4,1% sodium hydroxide solution 13, lithium porcelain stone 4.5, new silica sand 18, magnesia 4.5, maize cob meal 0.7, zirconia ceramics microballon 1.6, old sand 27, modification coal dust 4.5, water 4.5；

Described modification coal dust is made up of the raw material of following weight portion (kilogram): brown coal powder 3.5, sorbierite 0.06, blue charcoal 0.7, methyl alcohol 0.4, potassium chlorate 0.2, potash 0.3, iron chloride 0.02, lime 0.03, calcium acetate 0.2, antimony trisulfide 0.2, Tween 80 0.06, water 2.3; Preparation method is: by brown coal powder and the mixing of blue charcoal, be crushed to particle diameter and be less than 100 μm, obtain powder; Tween 80, sorbierite are added to the water, stir, add potassium chlorate, potash, iron chloride, calcium acetate again, after stirring, add described powder, be ground to grain diameter and be less than 40 μm, spraying dry, spray methyl alcohol while stirring again, grind 13 minutes, then mix with other residual components, sealing, to obtain final product.

The preparation method of described environmental protection and energy saving molding sand, comprises the following steps:

(1) new silica sand, lithium porcelain stone and old sand are mixed, sieve, obtain the sand of particle diameter at 0.3-1.2mm, add together with maize cob meal in simpson mill, mix 18 minutes, then add the water of 40%, mix 5 minutes, obtain mixed sand;

(2) expanded perlite, concrete waste ground-slag are broken to particle diameter and are less than 1.2mm, then be mixed and heated to 85 DEG C with 1% sodium hydroxide solution, stir 25 minutes, dry, obtain particle;

(3) particle (2) step obtained and other residual components join in the puddle mixer in (1) step, and evenly do not add remaining water to spray shape under halt condition, wet mixing 7 minutes, to obtain final product.

Experimental data

The testing result of the present embodiment molding sand is as follows: green compression strength 0.21MPa, normal temperature green tensile strength 24Kpa, hot green tensile strength 3.9KPa, gas forming amount 11ml/g, gas permeability 168, clay content 11%.

Claims (2)

1. an environmental protection and energy saving molding sand, is characterized in that being made up of the raw material of following weight portion: expanded perlite 6-8, concrete waste residue 4-5, calgon 0.3-0.6,1% sodium hydroxide solution 10-15, lithium porcelain stone 4-5, new silica sand 15-20, magnesia 4-5, maize cob meal 0.6-0.9, zirconia ceramics microballon 1.2-1.8, old sand 25-30, modification coal dust 4-5, water 4-5;

Described modification coal dust is made up of the raw material of following weight portion: brown coal powder 3-4, sorbierite 0.05-0.08, blue charcoal 0.5-0.8, methyl alcohol 0.3-0.5, potassium chlorate 0.1-0.2, potash 0.2-0.3, iron chloride 0.01-0.02, lime 0.02-0.03, calcium acetate 0.1-0.2, antimony trisulfide 0.2-0.3, Tween 80 0.04-0.08, water 2-2.5; Preparation method is: by brown coal powder and the mixing of blue charcoal, be crushed to particle diameter and be less than 100 μm, obtain powder; Tween 80, sorbierite are added to the water, stir, add potassium chlorate, potash, iron chloride, calcium acetate again, after stirring, add described powder, be ground to grain diameter and be less than 40 μm, spraying dry, spray methyl alcohol while stirring again, grinding 10-15 minute, then mix with other residual components, sealing, to obtain final product.

2. the preparation method of environmental protection and energy saving molding sand according to claim 1, is characterized in that comprising the following steps:

(1) new silica sand, lithium porcelain stone and old sand are mixed, sieve, obtain the sand of particle diameter at 0.3-1.2mm, add in simpson mill together with maize cob meal, mixing 15-20 minute, then add the water of 40%, mixing 4-6 minute, obtains mixed sand;

(2) expanded perlite, concrete waste ground-slag are broken to particle diameter and are less than 1.2mm, then be mixed and heated to 80-90 DEG C with 1% sodium hydroxide solution, stir 20-30 minute, dry, obtain particle;

(3) particle (2) step obtained and other residual components join in the puddle mixer in (1) step, and evenly do not add remaining water to spray shape under halt condition, wet mixing 6-8 minute, to obtain final product.