Summary of the invention
The present invention is intended to overcome the prior art defect, and purpose is to provide and a kind ofly can economizes on resources, the preparation method of protection of the environment and the alumina-silica lightening casting material that reduces costs; With the prepared alumina-silica lightening casting material of this method, have the advantages that volume density is little, thermal conductivity is low, intensity is high and reheating linear change rate on reheating is little.
For achieving the above object, the technical solution adopted in the present invention is: first take the alumina-silica aglite of 30 ~ 70wt%, the alumina-silica fine powder of 15 ~ 35wt%, the discarded molding sand powder of 10 ~ 20wt% and the high-temperature cement of 5 ~ 15wt% is raw material, the water of the water reducer of additional described raw material 0.15 ~ 0.25wt% and 15 ~ 25wt% again, stir, casting, room temperature maintenance 12 ~ 24h; Then dry 20 ~ 36h under 100 ~ 200 ℃ of conditions, be incubated 2 ~ 8h under 1000 ~ 1300 ℃ of conditions, obtains the alumina-silica lightening casting material.
The preparation method of described alumina-silica aglite is: first take the alumina-silica fine powder of 50 ~ 90wt% and the clay of 10 ~ 50wt% is raw material, stir 8 ~ 12h, the water of the pore-forming material of the wedding agent of additional described raw material 5 ~ 10wt%, 15 ~ 35wt% and 7 ~ 20wt% again, ageing mixture 24 ~ 48h, compression moulding; Then dry 4 ~ 24h under 80 ~ 200 ℃ of conditions, be incubated 2 ~ 10h under 1000 ~ 1400 ℃ of conditions, and fragmentation, namely obtain the alumina-silica aglite.
Described alumina-silica fine powder is the ceramic tile waste material, and its particle diameter is less than 0.074mm; The main chemical compositions of alumina-silica fine powder is: Al
2O
3>=40wt%, SiO
2>=45wt%, Na
2O≤0.5wt%, K
2O≤2.5wt%.
The particle diameter of described discarded molding sand powder is less than 0.088mm; The main chemical compositions of discarded molding sand powder is: Al
2O
3>=35wt%, SiO
2>=50wt%, ZrO
2≤ 5.5wt%.
Described water reducer is one or both in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and polyacrylic water reducer.
The particle diameter of described clay is less than 0.088mm; The main chemical compositions of clay is: Al
2O
3Content>=30wt%, SiO
2Content>=45wt%, TiO
2Content≤0.8wt%, Fe
2O
3Content≤2.0wt%.
Described pore-forming material is a kind of in chaff, straw, sawdust and rice husk.
Described wedding agent is one or both in Walocel MT 20.000PV, aluminium dihydrogen phosphate, polyvinyl alcohol and dextrin.
Owing to adopting technique scheme, the present invention compared with prior art has following positively effect:
1, the present invention is raw materials used has not only saved for current bulk deposition and the discarded ceramic tile of not being fully used the expense of processing a large amount of waste ceramics, has also saved resource, turns waste into wealth, therefore environmental friendliness and production cost are low.
2, the present invention adopts the burnout substances addition method to prepare the alumina-silica aglite, and its raw material, for discarded tile powder, has been realized the recycling to solid waste, and prepared alumina-silica aglite tap density is 0.5 ~ 0.7g/cm
3, technique is simple.
3, the present invention, by adding homemade alumina-silica aglite, can play the skeleton supporting role in mould material, improves the intensity of goods.
4, the prepared alumina-silica light cinder brick of the present invention after testing: volume density is lower than 1.7g/cm
3Cold crushing strength is 10.0 ~ 20.0MPa; After 1000 ~ 1250 ℃ of burnings, compressive strength is 25.0 ~ 45.0MPa; Thermal conductivity is 0.25 ~ 0.45W/ (mK); Reheating linear change rate on reheating is lower than ± 0.5%; Therefore product performance are good.
5, the present invention adopts the mode of casting, can be processed into difform brick type according to purposes, be applied to working lining, the furnace roof of kiln and various Thermal Equipments, in order to heat insulating and reduction energy consumption, simultaneously can alleviate the body of heater quality, guarantee that production safety carries out efficiently.
Therefore, the present invention have economize on resources, protection of the environment and the low characteristics of cost; Prepared alumina-silica lightening casting material has the advantages that volume density is little, thermal conductivity is low, intensity is high and reheating linear change rate on reheating is little, is directly used in kiln and other Thermal Equipments.
Embodiment
The present invention will be further described below in conjunction with embodiment, not limiting the scope of the invention.
For avoiding repetition, first the relevant technologies improve parameter unification that this embodiment is involved is described below:
Described alumina-silica fine powder is the ceramic tile waste material, and its particle diameter is less than 0.074mm; The main chemical compositions of alumina-silica fine powder is: Al
2O
3>=40wt%, SiO
2>=45wt%, Na
2O≤0.5wt%, K
2O≤2.5wt%.
The particle diameter of described discarded molding sand powder is less than 0.088mm; The main chemical compositions of discarded molding sand powder is: Al
2O
3>=35wt%, SiO
2>=50wt%, ZrO
2≤ 5.5wt%.
The particle diameter of described clay is less than 0.088mm; The main chemical compositions of clay is: Al
2O
3Content>=30wt%, SiO
2Content>=45wt%, TiO
2Content≤0.8wt%, Fe
2O
3Content≤2.0wt%.
Described pore-forming material is a kind of in chaff, straw, sawdust and rice husk.
Described wedding agent is one or both in Walocel MT 20.000PV, aluminium dihydrogen phosphate, polyvinyl alcohol and dextrin.
Embodiment 1
A kind of alumina-silica lightening casting material and preparation method thereof.First take the alumina-silica aglite of 30 ~ 40wt%, the alumina-silica fine powder of 30 ~ 35wt%, the discarded molding sand powder of 15 ~ 20wt% and the high-temperature cement of 10 ~ 15wt% is raw material, the water of the tripoly phosphate sodium STPP of additional described raw material 0.15 ~ 0.20wt% and 15 ~ 20wt% again, stir casting; Room temperature maintenance 12 ~ 24h, then dry 20 ~ 24h under 100 ~ 120 ℃ of conditions, be incubated 2 ~ 4h under 1000 ~ 1100 ℃ of conditions, obtains the alumina-silica lightening casting material.
The preparation method of the alumina-silica aglite in the present embodiment: first take the alumina-silica fine powder of 50 ~ 60wt% and the clay of 40 ~ 50wt% is raw material, stir 8 ~ 12h, the water of the pore-forming material of the wedding agent of additional described raw material 5 ~ 10wt%, 15 ~ 35wt% and 7 ~ 20wt% again, ageing mixture 24 ~ 48h, compression moulding; Then dry 4 ~ 24h under 80 ~ 200 ℃ of conditions, be incubated 2 ~ 10h under 1000 ~ 1400 ℃ of conditions, and fragmentation, namely obtain the alumina-silica aglite.
The prepared alumina-silica lightening casting material of the present embodiment is after testing: volume density is lower than 1.7g/cm
3Cold crushing strength is 5.0 ~ 20.0MPa; After 1100 ~ 1200 ℃ of burnings, compressive strength is 30.0 ~ 35.0MPa; Thermal conductivity is 0.25 ~ 0.30W/ (mK); Reheating linear change rate on reheating is lower than ± 0.5%.
Embodiment 2
A kind of alumina-silica lightening casting material and preparation method thereof.First take the alumina-silica aglite of 40 ~ 50wt%, the alumina-silica fine powder of 25 ~ 30wt%, the discarded molding sand powder of 15 ~ 20wt% and the high-temperature cement of 5 ~ 10wt% is raw material, the water of the Sodium hexametaphosphate 99 of additional described raw material 0.20 ~ 0.25wt% and 20 ~ 25wt% again, stir, casting, room temperature maintenance 12 ~ 24h; Then dry 24 ~ 28h under 120 ~ 140 ℃ of conditions, be incubated 4 ~ 6h under 1100 ~ 1200 ℃ of conditions, obtains the alumina-silica lightening casting material.
The preparation method of the alumina-silica aglite in the present embodiment: first take the alumina-silica fine powder of 60 ~ 70wt% and the clay of 30 ~ 40wt% is raw material, stir 8 ~ 12h, the water of the pore-forming material of the wedding agent of additional described raw material 5 ~ 10wt%, 15 ~ 35wt% and 7 ~ 20wt% again, ageing mixture 24 ~ 48h, compression moulding; Then dry 4 ~ 24h under 80 ~ 200 ℃ of conditions, be incubated 2 ~ 10h under 1000 ~ 1400 ℃ of conditions, and fragmentation, namely obtain the alumina-silica aglite.
The prepared alumina-silica lightening casting material of the present embodiment is after testing: volume density is lower than 1.6g/cm
3Cold crushing strength is 10.0 ~ 15.0MPa; After 1150 ~ 1250 ℃ of burnings, compressive strength is 28.0 ~ 33.0MPa; Thermal conductivity is 0.27 ~ 0.33W/ (mK); Reheating linear change rate on reheating is lower than ± 0.5%.
Embodiment 3
A kind of alumina-silica lightening casting material and preparation method thereof.It is characterized in that first the discarded molding sand powder of the discarded tile powder of the alumina-silica aglite of 50 ~ 60wt%, 20 ~ 25wt%, 15 ~ 20wt% and the high-temperature cement of 5 ~ 10wt% evenly being mixed, the polyacrylic water reducer of additional described raw material 0.15 ~ 0.20wt% and the water of 15 ~ 17wt% again, stir, casting, room temperature maintenance 12 ~ 24h, then dry 28 ~ 32h under 140 ~ 160 ℃ of conditions, be incubated 6 ~ 8h under 1150 ~ 1250 ℃ of conditions, obtains the alumina-silica lightening casting material.
The preparation method of the alumina-silica aglite in the present embodiment is: first take the alumina-silica fine powder of 70 ~ 80wt% and the clay of 20 ~ 30wt% is raw material, stir 8 ~ 12h, the water of the pore-forming material of the wedding agent of additional described raw material 5 ~ 10wt%, 15 ~ 35wt% and 7 ~ 20wt% again, ageing mixture 24 ~ 48h, compression moulding; Then dry 4 ~ 24h under 80 ~ 200 ℃ of conditions, be incubated 2 ~ 10h under 1000 ~ 1400 ℃ of conditions, and fragmentation, namely obtain the alumina-silica aglite.
The prepared alumina-silica lightening casting material of the present embodiment is after testing: volume density is lower than 1.7g/cm
3Cold crushing strength is 13.0 ~ 16.0MPa; After 1150 ~ 1250 ℃ of burnings, compressive strength is 35.0 ~ 40.0MPa; Thermal conductivity is 0.35 ~ 0.45W/ (mK); Reheating linear change rate on reheating is lower than ± 0.5%.
Embodiment 4
A kind of alumina-silica lightening casting material and preparation method thereof.It is characterized in that by the high-temperature cement of the discarded molding sand powder of the discarded tile powder of the alumina-silica aglite of 60 ~ 70wt%, 15 ~ 20wt%, 10 ~ 15wt% and 5 ~ 10wt%, being first raw material, the water of the Sodium hexametaphosphate 99 of the tripoly phosphate sodium STPP of additional described raw material 0.05 ~ 0.10wt%, 0.10 ~ 0.15wt% and 17 ~ 20wt% again, stir, casting, room temperature maintenance 12 ~ 24h; Then dry 32 ~ 36h under 160 ~ 180 ℃ of conditions, be incubated 2 ~ 5h under 1200 ~ 1300 ℃ of conditions, obtains the alumina-silica lightening casting material.
The preparation method of the alumina-silica aglite in the present embodiment is: first take the alumina-silica fine powder of 80 ~ 90wt% and the clay of 10 ~ 20wt% is raw material, stir 8 ~ 12h, the water of the pore-forming material of the wedding agent of additional described raw material 5 ~ 10wt%, 15 ~ 35wt% and 7 ~ 20wt% again, ageing mixture 24 ~ 48h, compression moulding; Then dry 4 ~ 24h under 80 ~ 200 ℃ of conditions, be incubated 2 ~ 10h under 1000 ~ 1400 ℃ of conditions, and fragmentation, namely obtain the alumina-silica aglite.
The prepared alumina-silica lightening casting material of the present embodiment is after testing: volume density is lower than 1.7g/cm
3Cold crushing strength is 15.0 ~ 20.0MPa; After 1200 ~ 1300 ℃ of burnings, compressive strength is 40.0 ~ 45.0MPa; Thermal conductivity is 0.30 ~ 0.35W/ (mK); Reheating linear change rate on reheating is lower than ± 0.5%.
Embodiment 5
A kind of alumina-silica lightening casting material and preparation method thereof.It is characterized in that by the high-temperature cement of the discarded molding sand powder of the discarded tile powder of the alumina-silica aglite of 35 ~ 40wt%, 30 ~ 35wt%, 10 ~ 15wt% and 10 ~ 15wt%, being first raw material, the polyacrylic water reducer of the tripoly phosphate sodium STPP of additional described raw material 0.05 ~ 0.10wt%, 0.10 ~ 0.15wt% and the water of 17 ~ 22wt% again, stir, casting, room temperature maintenance 12 ~ 24h; Then dry 30 ~ 34h under 170 ~ 200 ℃ of conditions, be incubated 5 ~ 8h under 1150 ~ 1250 ℃ of conditions, obtains the alumina-silica lightening casting material.
The preparation method of the alumina-silica aglite in the present embodiment is with embodiment 1.
The prepared alumina-silica lightening casting material of the present embodiment is after testing: volume density is lower than 1.7g/cm
3Cold crushing strength is 18.0 ~ 23.0MPa; After 1150 ~ 1250 ℃ of burnings, compressive strength is 33.0 ~ 37.0MPa; Thermal conductivity is 0.32 ~ 0.37 W/ (mK); Reheating linear change rate on reheating is lower than ± 0.5%.
Embodiment 6
A kind of alumina-silica lightening casting material and preparation method thereof.It is characterized in that by the high-temperature cement of the discarded molding sand powder of the discarded tile powder of the alumina-silica aglite of 45 ~ 50wt%, 25 ~ 30wt%, 15 ~ 20wt% and 10 ~ 15wt%, being first raw material, the polyacrylic water reducer of the tripoly phosphate sodium STPP of additional described raw material 0.07 ~ 0.12wt%, 0.08 ~ 0.13wt% and the water of 20 ~ 23wt% again, stir, casting, room temperature maintenance 12 ~ 24h; Then dry 26 ~ 30h under 180 ~ 200 ℃ of conditions, be incubated 5 ~ 8h under 1050 ~ 1150 ℃ of conditions, obtains the alumina-silica lightening casting material.
The preparation method of the alumina-silica aglite in the present embodiment is with embodiment 2.
The prepared alumina-silica lightening casting material of the present embodiment is after testing: volume density is lower than 1.6g/cm
3Cold crushing strength is 10.0 ~ 13.0MPa; After 1050 ~ 1150 ℃ of burnings, compressive strength is 25.0 ~ 30.0MPa; Thermal conductivity is 0.33 ~ 0.38W/ (mK); Reheating linear change rate on reheating is lower than ± 0.5%.
Embodiment 7
A kind of alumina-silica lightening casting material and preparation method thereof.It is characterized in that by the high-temperature cement of the discarded molding sand powder of the discarded tile powder of the alumina-silica aglite of 55 ~ 60wt%, 15 ~ 25wt%, 15 ~ 20wt% and 10 ~ 15wt%, being first raw material, the water of the Sodium hexametaphosphate 99 of the tripoly phosphate sodium STPP of additional described raw material 0.05 ~ 0.10wt%, 0.10 ~ 0.15wt% and 23 ~ 25wt% again, stir, casting, room temperature maintenance 12 ~ 24h; Then dry 22 ~ 26h under 130 ~ 150 ℃ of conditions, be incubated 3 ~ 6h under 1200 ~ 1300 ℃ of conditions, obtains the alumina-silica lightening casting material.
The preparation method of the alumina-silica aglite in the present embodiment is with embodiment 3.
The prepared alumina-silica lightening casting material of the present embodiment is after testing: volume density is lower than 1.6g/cm
3Cold crushing strength is 13.0 ~ 16.0MPa; After 1200 ~ 1300 ℃ of burnings, compressive strength is 23.0 ~ 28.0MPa; Thermal conductivity is 0.28 ~ 0.33W/ (mK), and reheating linear change rate on reheating is lower than ± 0.5%.
Embodiment 8
A kind of alumina-silica lightening casting material and preparation method thereof.It is characterized in that by the high-temperature cement of the discarded molding sand powder of the discarded tile powder of the alumina-silica aglite of 65 ~ 70wt%, 15 ~ 20wt%, 10 ~ 15wt% and 5 ~ 10wt%, being first raw material, the water of the Sodium hexametaphosphate 99 of the tripoly phosphate sodium STPP of additional described raw material 0.08 ~ 0.13wt%, 0.07 ~ 0.12wt% and 22 ~ 25wt% again, stir, casting, room temperature maintenance 12 ~ 24h; Then dry 24 ~ 28h under 150 ~ 170 ℃ of conditions, be incubated 4 ~ 7h under 1100 ~ 1200 ℃ of conditions, obtains the alumina-silica lightening casting material.
The preparation method of the alumina-silica aglite in the present embodiment is with embodiment 4.
The prepared alumina-silica lightening casting material of the present embodiment is after testing: volume density is lower than 1.7g/cm
3Cold crushing strength is 16.0 ~ 19.0MPa; Compressive strength 25.0 ~ 30.0MPa after 1100 ~ 1200 ℃ of burnings; Thermal conductivity is 0.40 ~ 0.45W/ (mK); Reheating linear change rate on reheating is lower than ± 0.5%.
This specific embodiment is raw materials used is the discarded ceramic tile of solid of bulk deposition, alleviates environmental stress, turns waste into wealth simultaneously.Goods adopt casting, and production technique is simple.Prepared alumina-silica light cinder brick is after testing: volume density is lower than 1.7g/cm
3Cold crushing strength is 10.0 ~ 20.0MPa; After 1000 ~ 1300 ℃ of burnings, compressive strength is 25.0 ~ 45.0MPa; Thermal conductivity is 0.25 ~ 0.45W/ (mK); Reheating linear change rate on reheating is lower than ± 0.5%.
Therefore, the present invention have economize on resources, protection of the environment and the characteristics that reduce costs, prepared alumina-silica lightening casting material volume density is little, thermal conductivity is low, intensity is high and reheating linear change rate on reheating is little, is directly used in kiln and other Thermal Equipments.