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

A technology of bentonite and clay sand, which is applied to casting 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 dry type clay sand
  • Use method of modified bentonite by lithiation in casting dry type clay sand
  • Use method of modified bentonite by lithiation in casting dry 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 for 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), Moisture content: 5-7% (wt) (based on 100 parts of sand weight) (added during wet mixing of molding sand). Mix with ordinary roller sand mixer, first dry mix new sand, old sand, and lithiated bentonite for 2 minutes , Then add water and wet mix for 10 minutes, drying temperature 120 ~ 160 ℃, drying time 60 minutes. The dry compressive strength of the molding sand is 376KPa.

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) (by weight of 100 parts of sand), water 5-7% (wt) (by weight of 100 parts of sand) (added during wet mixing of molding sand). Use an ordinary wheel-type sand mixer for mixing. First dry mix new sand, old sand, and lithiated bentonite for 2 minutes, then add water and wet mix for 10 minutes. The drying temperature is 120-160°C and the drying time is 60 minutes. The wet compressive strength of the molding sand is 408KPa.

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), 10% (wt) of lithiated bentonite (based on 100 parts of sand weight), moisture 5-7 (wt) (based on 100 parts of sand weight) (added when molding sand is wet mixed) %. Mix with wheel type sand mixer, dry mix for 2 minutes, then add water and wet mix for 10 minutes, drying temperature is 120-160°C, drying time is 60 minutes. The wet compressive strength of the molding sand is 420KPa.

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Abstract

The invention discloses an application method of lithiation modified bentonite clay in moulding dry clay sand and comprises the following steps: original sand is composed of 50-90 percent (wt) of old sand with the grain size of 15Q (H), and 50-90 percent (wt) of new sand with the grain size of 15Q (H); according to the reference of 100 weight parts of the original sand, lithiation bentonite clay accounting for 2-10 percent of the weight of the original sand is added to mix with 0-8 percent of calcium bentonit clay, and 5-7 percent of water is added when the moulding sand is wet-mixed; the mixed production is conducted by using an ordinary sand roller mill, the new sand, the old sand, the lithiation bentonite clay and the calcium bentonit clay are dry-mixed for two minutes, and then the wet mixture is conducted by adding the water for ten minutes; the drying temperature is 120-160 DEG C, the drying time is 60 minutes, and finally the dry pressing intensity of the obtained moulding sand is 360-405KPa.

Description

technical field [0001] The invention relates to a new application of lithiated modified bentonite, and more specifically relates to a method for using lithiated modified bentonite in casting dry 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 Nax(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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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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