KR960011327B1 - Process for the preparation of magnetic tail using paper sludge ashes - Google Patents

Abstract

The process for preparing magnetic tile comprises mixing 3-10 wt.% paper sludge incineration ash containing 2-10 % non-combustible powder, 30-40 wt.% pottery stone, 21-25 wt.% feldspar, 20 wt.% clay, 6-10 wt.% red earth and 1-5 wt.% kaolinite; pulverizing the raw material into a tile having an average particle size of 8.6-12.6 Pm; and molding the material under the pressure of 200-300 kg/cm2 and firing the molded body at a high temperature of 1,140-1,170 deg.C.

Description

Method of manufacturing magnetic tiles using paper sludge incineration

The present invention relates to a method for recycling paper sludge incineration ash generated as waste during the papermaking process, and more particularly, to a method for using paper sludge incineration ash in the manufacture of tiles widely used as building materials.

Currently, the paper sludge produced during domestic paper processing is a considerable amount of more than 700,000 tons per year, and most of this sludge is incinerated and landfilled. However, paper sludge incineration is not good in appearance, and if it is further reclaimed, it may contaminate groundwater and it is not easy to secure a landfill.

Paper sludge incineration is an inorganic material containing a little unburned powder and has a fine particle size and has a chemical composition as follows. Therefore, studies have been attempted for use in building materials, cement raw materials or artificial lightweight aggregates.

For example, Korean Patent Publication No. 89-2566 discloses a method for producing fire-resistant building materials by inducing SiO contained in paper sludge incineration ash to silicate lime, adding cured lime, asbestos, sodium silicate, and the like to steam curing. In addition, the Republic of Korea Patent Publication No. 91-2580 also discloses a method for producing a fire-resistant building material by adding a strong acid to the paper sludge incineration ash and curing by adding cement, gypsum, asbestos, caustic soda after swelling treatment.

However, these methods have a long curing period of about 2 to 4 weeks, are difficult to cure conditions such as applying a constant temperature and pressure, and the raw material price is increased due to the addition of various mixtures and the manufacturing process is complicated. There is a problem that the use of the material is not economic.

In addition, there are many recycling materials using fly ash, briquettes, blast furnace slag, which are similar wastes, but most of them are low value-added bricks and cements as additives.In Korean Patent Publication No. 89-2082, a method of manufacturing high strength tiles using blast furnace slag Although it is disclosed, various fluxes and nuclear material CrO are added to melt at a high temperature of 1400 ° C., and then reheated at 800 ° C., thereby causing a lack of practicality due to complexity and economical efficiency of the manufacturing process.

In addition, the paper sludge incinerator itself is 1.91 ~ 2.46, which is lower than other inorganic raw materials (feldspar: 2.57 ~ 2.75, feldspar: 2.65 ~ 2.9, kaolin: 2.61, clay: 2.4 ~ 2.6) and has an average particle size of 5 ~ 6㎛. Because of the high specific surface area during the sintering and micro sintering, the driving force to lower the surface energy during the sintering to stabilize the thermodynamics is large, resulting in large plastic shrinkage, low fire resistance, large shrinkage rate, high absorption rate, and no plasticity. There is a material problem that is difficult to mold because there is a difficult point that can not be actively used despite the above utilization plan.

The present invention has been made to solve the above problems, and an object of the present invention is to propose a method of using a new paper sludge incineration ash that solves the problems according to the characteristics of the material.

In accordance with the above purpose, the present inventors have investigated the characteristics of paper sludge incinerator more closely and studied ways to use it more actively. As a result, the chemical composition of paper sludge incinerator is widely used as interior and exterior materials of building and flooring materials. Found similar to the clay, feldspar, pottery stone, kaolin and the like used in the preparation of the present invention to achieve the effect of improving the properties of the tile and lower the firing temperature when used in a certain amount.

The following shows the chemical composition of clay, feldspar, pottery stone, kaolin, etc., which are used to make tiles.

That is, the present invention is mixed and pulverized 3-10% by weight of paper sludge incineration, 30-40% by weight, clay 20% by weight, feldspar 21-25% by weight, red soil 6-10% by weight, kaolin 1-5% by weight Provided is a method for producing a magnetic tile containing a paper sludge incineration material, which is formed by molding at a predetermined pressure and firing at a high temperature.

The paper sludge incineration material used in the present invention is an inorganic material containing 2 to 10% of unburned powder, and the particle size distribution is 50 to 60% by weight or less before the pulverization, and 200 or less is 94 to 95% by weight. After grinding, 325 mesh or less is 99.9% by weight (average particle size: 5 ~ 6㎛), very fine, and as described above, its chemical composition is very different from that of feldspar, clay or pottery used as a conventional tile material. similar.

However, there is a problem in that the plastic surface shrinkage during sintering and the plasticity shrinkage during sintering is low and the degree of fire resistance is low and the absorption rate is large.

In the present invention, the mixing ratio of the other members such as clay, pottery, kaolin, feldspar and paper sludge incineration material is appropriately given as described above to give plasticity to the molding, to adjust the degree of fire resistance or to increase the bonding between the compositions during firing. Can be solved.

That is, clays give plasticity, and pottery plays a role of adjusting plastic shrinkage and fire resistance, and feldspar melts when heated to become a strong melt, and does not crystallize when cooled and remains in a glass state. It enters the grain boundary and eliminates pores and acts as a binder. Red soil has no special plasticity, but it has cost reduction aspect. Kaolin is colored pink during firing to give the color of tiles and adjust the degree of fire resistance.

In the present invention, in the manufacturing method of the magnetic tiles to which the above-described paper sludge incineration material is added, after mixing and pulverizing each member, the molding method is compressed to a pressure of 200 to 300 kg / cm 3 which is performed in a conventional tile manufacturing process. Press molding.

Moreover, sintering temperature is performed at 1140-1170 degreeC.

This value is about 5 to 40 ° C. lower than the sintering temperature in the manufacturing process of conventional wall or floor tiles.

As such, when the paper sludge incineration material is added to produce the wall or floor tiles, the firing temperature can be lowered by 5 to 40 ° C. than the conventional process, which is a significant finding in terms of energy saving and cost reduction.

Tiles produced by the method of the present invention has a density of 2.05-2.45, 6-12% bower shrinkage, up to 0% when the absorption rate is appropriately drawn, and the breaking strength is 13 kgf / cm or more. It has at least boiling or superior properties compared to tiles made only of clay, feldspar and kaolin.

The manufacturing method of the magnetic tile to which the paper sludge incineration ash of the present invention is added is described in more detail for each process as follows.

[Manufacture process]

1. Raw material weighing

3 to 10% by weight of paper sludge incineration is added, and to give plasticity, 20% by weight of clay is melted upon heating, which becomes a strong melt, and remains in a glass state without crystallization upon cooling and enters the grain boundary between grains and grains. 21-25% by weight of feldspar acts as a binder and 30 ~ 40% by weight of pottery to reduce the plastic shrinkage and fire resistance and affinity with incineration materials when mixing raw materials. ~ 10% by weight, 1 to 5% by weight of kaolin for the control of fire resistance and color impartment is added.

2. grinding

50% of the weight of the raw material is added to the raw material weighed in 1, and the raw materials are pulverized and mixed using a ball mill. The grinding time is sufficient for 30 minutes, but if the grinding time is increased for 1 to 3 hours, the particle size becomes finer and the plastic shrinkage and the water absorption can be simultaneously reduced by increasing the contact point between the particles during molding and sintering. The average particle size of conventional tile material is 13 ~ 15㎛, whereas the developed particle size is 12.6 ~ 14.1㎛ when the added amount of ash is 3%, 9.9 ~ 10.6㎛ when 6% and 8.6% when it is 10%. It is much finer at ~ 9.1㎛, which helps to speed up the firing rate and lower the firing temperature.

3. Dry

The mixed and ground raw materials are dried until the water content is 5% by weight at 105 ° C drying.

4. Molding

The dried raw material is molded at a molding pressure of 200 to 300 kg / cm 3. Molding uses a single-screw press machine, and when pressurized, the internal air is sufficiently taken out to have a uniform and high packing density, and plastic shrinkage and absorption rate can be simultaneously reduced.

5. Sintering

Heating rate is maintained at 35 ~ 40 ℃ / min, 1140 ~ 1170 ℃ for 3 ~ 6 minutes and fired by natural cooling.The optimum temperature is 1155 ~ 1165 ℃, 6% days when incineration ash is contained 3% in wall tile. When 1150 ~ 1160 ℃, and when 10% to 1140 ℃ or less. This firing temperature can be 5 ~ 40 ℃ lower than the conventional tile firing temperature.

Example

Next, the present invention will be described in more detail with reference to preferred embodiments of the present invention. However, the following examples are provided to more easily understand the present invention, but the present invention is not limited to these examples.

Example 1

3% by weight of paper sludge incineration, 20% by weight of clay, 37-40% by weight of pottery stone, 22-25% by weight of feldspar, 2-5% by weight of kaolin, and 7-10% by weight of red soil, and crushed by ball mill 50 mesh The particles were passed through to adjust the average particle size to 12.61 to 14.13 µm.

Next, the sample was dried to a moisture content of 5% by weight in a 105 ° C. dryer, and then molded at a pressure of 200 to 300 kg / cm 3, and the temperature was raised to 35 to 40 ° C./min and maintained at 1140 to 1170 ° C. for 3 to 6 minutes. After the natural cooling to prepare a magnetic tile.

Example 2

Except that the incineration ash in the combination described in Example 1 was increased from 3% by weight to 6% by weight, and the pottery was reduced by 3% to 34 to 37% by weight, and the average particle size was 9.96 to 10.58 µm. Same treatment as 1

Example 3

In the combination described in Example 1, the incinerator was increased by 7% to 10% by weight, and the coating was reduced by 6 to 7% by weight to 30 to 34% by weight, except that the average particle size was set to 8.62 to 9.11 μm. The same treatment as in Example 1 was carried out.

Comparative Example 1

25% by weight of feldspar, 40% by weight of pottery stone, 20% by weight of clay, 10% by weight of red soil, and 5% by weight of kaolin are ground and milled with a ball mill (average particle size after grinding is 13.57 to 14.64㎛). Slightly larger than Examples 1 to 3). After drying the sample to 5% by weight of moisture in a 105 ℃ dryer, it was molded at a pressure of 200 ~ 300㎏ / ㎠ and raised at a heating rate of 35 ~ 40 ℃ / min and maintained at 1140 ~ 1170 ℃ for 3-6 minutes. Cooling to prepare the existing interior wall tiles.

The physical properties of the tiles prepared in Examples 1 to 3 and Comparative Example 1 were as shown in Table 3 below.

Tiles containing 3 to 10% by weight of paper sludge incineration ash prepared by the above method can be found in the following advantages and significance.

First, it can solve the landfill material by recycling the paper sludge incineration material, and at the same time, it can reduce the tile manufacturing cost by replacing the existing raw materials. Second, the firing temperature of the paper sludge incineration material can be lowered by 5 ~ 40 ℃. Fuel saving effect can be seen. Third, the strength to be sintered by good sinterability of paper sludge incinerator increases by 8 ~ 29.5% compared to KS standard, so that the absorption rate can be lowered to 0%. Fourth, the appearance is smoother and more color than conventional tiles. Finally, based on the recycling technology of the paper sludge incineration ash to the tile, it is possible to recycle to other electronic materials, and also expand to the recycling of all inorganic general wastes and ultimately play a role in solving environmental problems. can do.

Claims (1)

The average particle size of tile is 8.6 ~ 12.6㎛, 3 ~ 10% of paper sludge incineration ash containing 2 ~ 10% of unburned, 30 ~ 40% of pottery, 21 ~ 25% of feldspar, 20% of clay, red clay 6 to 10% by weight, kaolin 1 to 5% by weight of a mixture of crushed and molded at a pressure of 200 ~ 300 ㎏ / ㎠ to bake at a high temperature of 1140 ~ 1170 ℃ characterized in that the magnetic tiles with the addition of paper sludge incineration Manufacturing method.