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.

Inactive Publication Date: 2009-03-04
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of lithium-based bentonite in molding sand has not been reported.

Method used

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  • Use method of modified bentonite by lithiation in casting wet type clay sand
  • Use method of modified bentonite by lithiation in casting wet type clay sand
  • Use method of modified bentonite by lithiation in casting wet type clay sand

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses an application method of lithiation modified bentonite in casting green sand, which comprises the following steps: forming raw sand from 50 wt% to 90 wt% of old sand with the particle size being 15 Q(H) (circle minus square) and 50 wt% to 10 wt% of new sand with the particle size being 15 Q(H) (circle minus square); adding 2% to 10% of lithiation bentonite, 0% to 8% of calcium bentonite and 2% to 4% of casting coal powder by the weight of the raw sand every 100 weight parts of the raw sand, and mixing; adding 5% to 6% of water when wet-mixing casting sand, and mixing by a common sand roller mill; and dry-mixing the new sand, the old sand, the coal powder and the lithiation bentonite for 2 minutes, then, adding water and wet-mixing for 10 minutes, and finally obtaining the casting sand with the green compression strength being 130 to 140 KPa and the air permeability being 100 to 150.

Description

technical field [0001] The invention relates to a new application of lithiated modified bentonite, more specifically relates to a method for using lithiated modified bentonite in casting green clay sand. Background technique [0002] The main mineral composition of bentonite is montmorillonite, in addition to associated impurities. The crystal structure of montmorillonite is composed of two layers of silicon-oxygen tetrahedral wafers with a layer of aluminum-oxygen octahedral wafers sandwiched between them. It is a 2:1 type layered silicate mineral. Its theoretical chemical formula is Na x (H 2 O) 4 {Al 2 [Al x Si 4-x o 10 ](OH) 2}, the total anion charge in half the unit cell [O 10 (OH) 2 ] is 22, the number of cations in the octahedron is 2, and the number of cations in the tetrahedron is 4, such as figure 1 shown. Generally, Fe 2+ , Fe 3+ , Mg 2+ 、Al 3+ Isomorphic substitution of isomorphic cations, when the replacement cations are low-priced, the structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/02
Inventor 潘嘉祺孙亚琴陈麒忠周晓洁
Owner SHANGHAI INST OF TECH
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