Process for the production of ceramic tiles

Details Process for the production of ceramic tiles Process for the production of ceramic tiles

2002-03-28

2004-06-01

Fiorilla, Christopher A. (Department: 1731)

Plastic and nonmetallic article shaping or treating: processes

Recycling of reclaimed or purified process material

Of liquid process material

C264S037100, C264S643000, C264S660000

Reexamination Certificate

active

06743383

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to an improved process for the production of ceramic tiles using industrial wastes. The invention particularly relates to an improved process for the production of ceramic tiles using industrial wastes such as iron ore slime, fly ash and blast furnace slag.
The products produced by the process of present invention may be of different shapes and sizes, in the glazed or unglazed forms as per requirement. The near impervious unglazed tiles shall be useful for laying floor of industries, storage depots, buildings etc. where the floors are subjected to scratch and abrasion. The glazed tiles with matte finish shall be useful for making decorative floors while the glazed tiles with glossy finish shall be useful for making decorative walls of buildings.
BACKGROUND OF THE INVENTION
Hitherto known processes use costly minerals such as kaolin, feldspar, quartz, talc, pyrophyllite etc. to produce ceramic tiles. The existing processes to produce ceramic tiles, consisted of wet mixing of raw materials, spray drying, compaction, drying, glazing and firing. The raw materials are wet mixed in mills. The wet slurry obtained is filter pressed to squeeze the water out and then spray dried to get very small nodules of raw material for better compaction. The ready powder is compacted in tile shape by hydraulic pressing then dried and fired to get unglazed tiles. To get the glazed tiles first engob is applied to hide the body colour then glaze is applied on the surface of unbaked tiles and then fired. The existing process also require double firing for high quality glossy glazing of tiles for walls. Another known process use iron ore tailings in combination with other minerals like kaolin, feldspar, quartz, talc etc. to produce ceramic tiles. The raw materials are wet mixed in mills, filter pressed to squeeze the water out and then spray dried to get small nodules of raw material for better compaction. The ready powder is compacted in tile shape by hydraulic pressing then dried and fired to get unglazed tiles. To get the glazed tiles first engob then glaze is applied on the surface of unbaked tiles and then fired.
U.S. Pat. No. 5,830,251 discloses the manufacture of ceramic tiles by first melting material to form glass, followed by grinding the glass with additives and compacting it to the shape required and devitrifying it to form the final ceramic tiles.
U.S. Pat. No. 5,558,690 discloses a process wherein spent aluminium potliner containing carbonaceous material, fluorine and glass forming materials are oxidized to combust the carbonaceous materials and partially volatilize the fluorine in the glass forming materials. The oxidized glass forming materials are then vitrified to form a glass melt which is then formed into fluorine containing tiles.
U.S. Pat. No. 5,935,885 discloses a process wherein fly ash containing organic material, metal contaminants, and glass forming materials is oxidized under conditions sufficient to combust the organic material and partially oxidize the metal contaminants and the glass forming materials. The oxidized glass forming materials are then vitrified to form a glass melt, which is then formed into the final tiles containing metallic contaminants.
The above processes suffer from several disadvantages:
1. Waste materials first need to melted thereby significantly increasing energy consumption.
2. The further grinding of the glass formed also requires high energy consumption.
Floors made of products of known processes are not capable of withstanding scratch and high abrasion required in a number of industrial applications as they have relatively low scratch hardness (around 5 in Molt's Scale) and compressive strength. The production cost of the sintered tiles made from the costly minerals is relatively high The raw materials used for production of existing ceramic floor and wall tiles require long time for grinding to achieve fineness since they are formed in lumps, leading to the consumption of more energy.
OBJECTS OF THE INVENTION
The main object of the present invention is to provide an improved process to produce ceramic tiles in glazed and unglazed form using industrial wastes such as iron ore slime, fly ash, blast furnace slag and other low cost minerals.
Another object of the present invention is to provide an improved process to produce unglazed and glazed ceramic tiles using industrial wastes such as iron ore slime, fly ash, blast furnace slag and other low cost minerals whereby the cost of production is appreciably lowered and the properties of the product is improved.
Yet another object of the present invention is to provide an improved process to produce glazed and unglazed tiles using industrial wastes such as iron ore slime fly ash and blast furnace slag whereby the energy consumption is significantly reduced.
Still yet another object of the present invention is to provide an improved process to produce glazed and unglazed tiles using iron ore slime, fly ash and blast furnace slag which are waste materials and thereby reducing the pollution in the environment.
SUMMARY OF THE INVENTION
According to literature survey and available information, at present no process is available to produce ceramic tiles from iron ore slime, fly ash and blast furnace slag, which is energy intensive. The purpose of this development is to use abundantly available waste materials such as iron ore slime, fly ash and blast furnace slag which cause environmental pollution, as raw material to produce value added products such as ceramic tiles.
Accordingly, the present invention provides an improved process for the production of ceramic tiles using industrial wastes which comprises:
(a) intimately mixing iron ore slime in the range of 30 to 50% by weight, fly ash 10 to 25% by weight, blast furnace slag 5 to 20% by weight, aluminosilicate minerals 25 to 50% by weight, additives 5 to 15% by weight, the balance comprising water, for a period in the range of 6 to 10 hours,
(b) drying the wet mixed raw materials,
(c) granulating the dried powder using an organic liquid binder,
(d) compacting the granulated powder to form tiles of the desired size,
(e) drying the compacted tiles slowly at a temperature in range of 90 to 120° C. for a period in the range of 10 to 15 hours.
In one embodiment of the invention, the iron ore slime, fly ash, blast furnace slag and alumino silicate minerals are selected from the following composition range:
Constituent
Blast
Aluminosilicate
(wt %)
Iron ore slime
Fly ash
furnace slag
minerals
SiO
2
 1-20
45-65
25-45
40-65
Al
2
O
3
 1-10
15-30
15-30
15-20
Fe
2
O
3
75-95
3-6
0.01-2  
1-5
CaO
Trace
1-4
25-40
2-5
MgO
Trace
0.01-2  
 5-15
Trace
TiO
2
0.01-2  
1-3
1-2
0.01-2  
L.O.I.
1-5
1-8
1-3
 8-15
In one embodiment of the invention, the compacted tiles as obtained are fired at a temperature in the range of 1100 to 1300° C. for a period in the range of 30 to 60 minutes to obtain unglazed tiles.
In another embodiment of the invention, unglazed tiles are cooled slowly after firing. In another embodiment of the invention, engob is applied to the dried compacted tiles and the tiles thereafter glazed to obtain glazed tiles.
In a further embodiment of the invention, engob is applied by spraying onto compacted tiles.
In a further embodiment of the invention, the glazed tiles are fired at a temperature in the range of 1050 to 1150° C. for a period in the range of 15 to 30 minutes.
In another embodiment of the invention, glazed tiles are cooled slowly after firing.
In a further embodiment of the invention, the aluminosilicate mineral is selected from the group consisting of kaolin, bentonite, illite and pyrophillite.
In another embodiment of the invention, the additives are selected from the group consisting of talc, soapstone, feldspar and any mixture thereof.
In yet another embodiment of the invention, the organic binder is selected from the group consisting of polyvinyl alcohol, methyl cellulose, carbomethoxy cellulose and dextrin. In a further embodiment

Affiliated with

Also associated with

Rating

Process for the production of ceramic tiles does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the production of ceramic tiles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of ceramic tiles will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3323534