Use method of modified bentonite by lithiation in casting wet type clay sand
A technology of wet clay sand and bentonite, which is used in foundry molding equipment, molds, cores, etc.
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Embodiment 1
[0016] Old sand (after old sand treatment, such as crushing, demagnetization, screening, dust removal, cooling, etc., particle size 15Q(H) (○-□) 70% (wt), new sand (particle size 15Q(H), □—○) 30% (wt), according to the practice of the foundry industry, except sand, the weight percentage of the remaining components refers to the weight percentage of the component relative to 100 parts of sand, lithiated bentonite 8% (wt) (based on 100 parts of sand weight) , coal powder (casting coal powder) 2% (wt) (in 100 parts of sand weight), moisture 5 ~ 6% (wt) (in 100 parts of sand weight) (adding when molding sand is wet mixed). The wheel type sand mixer is used for mixing. First, dry mix new sand, old sand, coal powder, and lithiated bentonite for 2 minutes, then add water and wet mix for 10 minutes. The wet compressive strength of the molding sand is 156KPa, and the air permeability is 110.
Embodiment 2
[0018] Old sand (after old sand treatment, such as crushing, demagnetization, screening, dust removal, cooling, etc., particle size 15Q(H) (○-□) 95% (wt), new sand (particle size 15Q(H), □—○) 5% (wt), lithiated bentonite 9% (wt) (based on 100 parts of sand weight), coal powder (casting coal powder) 4% (wt) (based on 100 parts of sand weight), moisture 5-6% (wt) (based on 100 parts of sand weight) (adding when the molding sand is wet-mixed). Carry out mixing with a common roller type sand mixer, first dry-mix new sand, old sand, coal powder, lithiated bentonite for 2 minutes, and then Add water and wet mix for 10 minutes.The wet compressive strength of the molding sand is 148KPa, and the air permeability is 100.
Embodiment 3
[0020] Old sand (after old sand treatment, such as crushing, demagnetization, screening, dust removal, cooling, etc., particle size 15Q(H) (○-□) 50% (wt), new sand (particle size 15Q(H), □—○) 50% (wt), lithiated bentonite 10% (wt) (based on 100 parts of sand weight), coal powder (casting coal powder) 4% (wt) (based on 100 parts of sand weight), moisture 5-6% (wt) (based on 100 parts of sand weight) (adding when the molding sand is wet-mixed). Carry out mixing with a common roller type sand mixer, first dry-mix new sand, old sand, coal powder, lithiated bentonite for 2 minutes, and then Add water and wet mix for 10 minutes.The wet compressive strength of the molding sand is 160KPa, and the air permeability is 100.
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