KR101338625B1 - Preparation method of ceramic block using wasted water sludge - Google Patents

Abstract

Provided is a manufacturing method of a ceramic block which comprises the following steps. A raw material is prepared by mixing a composition comprising 40-60 weight% of waste water sludge, 5-20 weight% of sand, 10-20 weight% of clay, 10-20 weight% of gypsum, 5-10 weight% of iron, 1-2 weight% of ash, 5-10 weight% of fiber and 1-2 weight% of calcium. The mixed raw material is placed in a press for a press molding process. The molded block is calcined at 1,100-1,300°C for 12-36 hours and cooled inside a furnace. The molded block is glazed and is additionally calcined at 1,230-1,300°C for 13-15 hours. [Reference numerals] (AA) Mix raw materials (sludge, sand, clay, gypsum, iron, ash, fiber, calcium, and other additives);(BB) Press and mold using a press;(CC) Dry the pressed and molded materials;(DD) Calcine the dried and molded materials

Description

Manufacturing method of ceramic block using sewage water sludge {PREPARATION METHOD OF CERAMIC BLOCK USING WASTED WATER SLUDGE}

The present invention relates to a method for producing a ceramic block using sewage sludge, and more particularly, to solve environmental problems by recycling sludge such as sewage and wastewater, and excellent in general properties including compressive strength, water absorption and water permeability. A method for producing a ceramic block and a ceramic block produced by the same method.

Economic development and improved living have caused pollution of drinking water sources, and the facilities of sewage treatment plants and wastewater treatment plants have been inevitably increased. Due to the increased sewage treatment plant and wastewater treatment plant, the amount of sewage and wastewater sludge generated during sewage and wastewater treatment is gradually increased, and its treatment is a serious environmental problem.

At present, the treatment of these sewage and wastewater sludges has been processed depending on landfilling, incineration after drying and ocean dumping. However, due to the reclamation of sewage and wastewater sludge, heavy metals and organic matter contained in the sludge cause heavy metal concentrations in the soil, groundwater contamination, various pathogens and odors, and during marine dumping, it is a major cause of marine pollution. Since 2013, marine dumping has been completely banned since 2013. In addition, since the moisture contained in the sludge exists in the bound or unbound water in the micropores of the solid or is surrounded by organic membranes, it is difficult to dry by a mechanical dehydration method. As it is expensive, the incineration method also uses a heat source, which is expensive as in the above heating and dehydration method, and causes secondary environment problems due to the scattering of ash or heavy metals.

The present invention has been made to solve the problems of the prior art as described above, the object is to solve the environmental problems by recycling the sludge such as sewage and wastewater, including compressive strength, water absorption and water permeability aspects To provide a ceramic block excellent in physical properties.

The technical problem of the present invention as described above is achieved by the following means.

(1) 40 to 60% by weight of sewage sludge powder, 5 to 20% by weight of sand, 10 to 20% by weight of clay, 10 to 20% by weight of gypsum, 5 to 10% by weight of iron, 1 to 2% by weight of ash, 5 to 5% of fiber Preparing a raw material by mixing a composition composed of 10 wt% and 1-2 wt% of calcium;

Putting the mixed raw materials into a press and forming a pressure block;

Firing and cooling the molded block in a firing furnace at 1,100 to 1,300 ° C. for 12 to 36 hours; And

A method of manufacturing a ceramic block using sewage sludge, comprising: treating the fired block with glaze and performing secondary firing at 1230-1300 ° C. for 13-15 hours.

(2) The method according to claim 1,

Method of producing a ceramic block, characterized in that the step of further drying the material for 1 to 2 hours at 60 ~ 80 ℃ in a drying room after the pressure molding.

(3) The method according to claim 1,

The method of manufacturing a ceramic block, characterized in that the bottom ash 5 to 10% by weight is further added to the raw material.

(4) The method according to 1 or 2,

5 to 10% by weight of volcanic stone and 2 to 5% by weight of zeolite are manufactured.

(5) The method according to claim 1 or 2,

The firing and cooling process is repeated 2 to 3 times, the cooling method of producing a ceramic block, characterized in that carried out using nitrogen.

(6) A ceramic block produced by the method of paragraph 1.

According to the present invention as described above, while solving the environmental problems by recycling the sludge such as sewage and waste water, it provides a ceramic block excellent in the overall physical properties including the aspects of compressive strength, water absorption and water permeability.

1 is a manufacturing process diagram of a ceramic block of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, after the wastewater sludge is collected from the wastewater sludge of the dehydrated cake state having a water content of 80% or more in a sewage treatment plant or industrial wastewater treatment plant, the wastewater sludge cake is first dried at about 100 to 120 ° C. for 24 to 36 hours, and The first dried sewage sludge is pulverized with a pulverizer to be used.

In the present invention, 40 to 60% by weight of the pulverized sewage sludge powder, 5 to 20% by weight of sand, 10 to 20% by weight of clay, 10 to 20% by weight of gypsum, 5 to 10% by weight of iron, 1 to 2% by weight of ash, A composition composed of 5 to 10% by weight of fibers and 1 to 2% by weight of calcium is mixed and placed in a press having a predetermined shape and pressure molded.

Preferably, 5-10% by weight of bottom ash is added to replace a part of sand together with the sludge powder in the composition of the mixture. By adding bottom ash, it is possible to further improve heat resistance and compressive strength and reduce weight.

More preferably, by adding a predetermined amount of volcanic stone and zeolite in the composition of the mixture, it is possible to further improve overall physical properties. For this purpose, the volcanic stone can be used in the range of 5 to 10% by weight, and zeolite is preferably added in the range of 2 to 5% by weight. Care should be taken because it is difficult to expect, as well as the physical property will fall due to excessive addition.

The material molded by the above process is preferably dried for 1 to 2 hours at 60 ~ 80 ℃ in a drying chamber, the dried material is preferably fired for 12 to 36 hours in a firing furnace of 1,100 ~ 1,300 ℃, Cooling process

The firing and cooling process is preferably performed by repeating about 2 to 3 times, in which case it is preferable to cool by using nitrogen in order to perform the process quickly to increase the amount of production.

The drying conditions and firing conditions are important in increasing and maintaining the density of the tissue and the strength of the product, and if these conditions are deviated, the function of the ceramic block may be remarkably deteriorated due to the deterioration of physical properties.

Finally, glaze is applied to the surface of the block which has been calcined, and is not limited to a specific kind such as glazes commonly used in ceramics manufacturing, for example, transparent oil, bluish green oil, ash oil and maple oil. Then, the glaze-coated ceramics are secondarily baked at 1230-1300 ° C. for 13-15 hours to complete the ceramic block.

As described above, in the present invention, a material obtained by powdering sludge of wastewater is mixed with sand, clay, gypsum, iron, ash, fiber, calcium, and other additives, and the material obtained by sintering is applied to conventional cement. Compared to the conventional ceramic block obtained by applying the conventional cement in terms of permeability and water absorption, as well as high compressive strength due to the strong bonding strength between components compared to the conventional block can be used as a ceramic block having a variety of uses.

The composition ratio of each component is important in terms of the overall physical properties required as the ceramic block in this way, and if excessive or insufficient in the content thereof, the compressive strength is lowered, the permeability and the water absorption are lowered, and its function as a desired use. Since there is a possibility that it cannot be satisfied, it is preferable to maintain the composition ratio between the components.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood, however, that these examples are provided so that the scope of the present invention is not limited thereto.

Example 1

According to the procedure shown in FIG. 1, 60% by weight of sewage sludge powder, 8% by weight of sand, 10% by weight of clay, 10% by weight of gypsum, 5% by weight of ash, 1% by weight of ash, 5% by weight of fiber, 1% by weight of calcium The composition consisting of a mixture was put into a press having a predetermined shape and pressure molded.

The molded material was dried in a drying room at 80 ° C. for 1 hour, and then the dried material was fired in a firing furnace at 1,200 ° C. for 24 hours and cooled to prepare a block. Then, the coating was applied to the block using fresh free oil and secondary baking was performed at 1300 ° C. for 15 hours to complete the ceramic block. Instead of the sewage sludge powder, a substitute of ordinary cement was used as a comparative example.

[Example 2]

Sewage sludge powder 40%, sand 18%, clay 20%, gypsum 10%, iron 5%, ash 1%, fiber 5%, calcium 1% by weight It is put into a press having a shape and press-molded.

The molded material was dried in a drying room at 80 ° C. for 1 hour, and then the dried material was fired in a firing furnace at 1,200 ° C. for 24 hours and cooled to prepare a block. Then, the coating was applied to the block using fresh free oil and secondary baking was performed at 1300 ° C. for 15 hours to complete the ceramic block.

[Example 3]

Composition consisting of 40% by weight sewage sludge powder, 10% by weight bottom ash, 8% by weight sand, 20% by weight clay, 10% by weight gypsum, 5% by weight iron, 1% by weight ash, 5% by weight fiber, 1% by weight calcium The mixture is put into a press having a predetermined shape and press-molded.

The molded material was dried in a drying room at 80 ° C. for 1 hour, and then the dried material was fired in a firing furnace at 1,200 ° C. for 24 hours and cooled to prepare a block. Then, the coating was applied to the block using fresh free oil and secondary baking was performed at 1300 ° C. for 15 hours to complete the ceramic block.

Example 4

Composition consisting of 40% by weight sewage sludge powder, 5% by weight bottom ash, 13% by weight sand, 20% by weight clay, 10% by weight gypsum, 5% by weight iron, 1% by weight ash, 5% by weight fiber, 1% by weight calcium The mixture is put into a press having a predetermined shape and press-molded.

The molded material was dried in a drying room at 80 ° C. for 1 hour, and then the dried material was fired in a firing furnace at 1,200 ° C. for 24 hours and cooled to prepare a block. Then, the coating was applied to the block using fresh free oil and secondary baking was performed at 1300 ° C. for 15 hours to complete the ceramic block.

[Example 5]

Sewage water sludge powder 40% by weight, bottom ash 5% by weight, sand 13% by weight, clay 10% by weight, volcanic stone 5% by weight, zeolite 5% by weight, gypsum 10% by weight, iron 5% by weight, ash 1% by weight, fiber 5 The composition consisting of weight% and calcium 1% by weight is mixed, put into a press having a predetermined shape, and pressure molded.

The molded material was dried in a drying room at 80 ° C. for 1 hour, and then the dried material was fired in a firing furnace at 1,200 ° C. for 24 hours and cooled to prepare a block. Then, the coating was applied to the block using fresh free oil and secondary baking was performed at 1300 ° C. for 15 hours to complete the ceramic block.

Experimental Example 1 Compressive Strength

Compressive strength was measured for the ceramic blocks manufactured through the above examples. The compressive strength was used by the hydraulic servo material tester (UTM), and the experiment was carried out by putting the manufactured block on the measuring equipment and maintaining the load control valve constant and stopping the highest peak value when the block was broken. Measured.

Sample Compressive strength (N / ㎡) Example 1 1500 Example 2 1500 Example 3 1600 Example 4 1650 Example 5 1700 Comparative Example 800

As shown in Table 1, the ceramic block according to the present invention appeared higher than the comparative example, it can be confirmed that it is very suitable as a ceramic block does not occur cracking or fracture phenomenon.

Experimental Example 2 Permeability

Permeability was measured for the ceramic blocks manufactured through the above examples.

The permeability was produced by fixing a 5cm × 5cm × 6cm mold and fixing two ceramic blocks manufactured through the firing process to each other at the bottom of the mold made for measuring the permeability. The permeability was measured by measuring the amount of water permeating the ceramic block for 10 minutes in 500ml of water, and the amount of water permeated was measured using a measuring cylinder.

Sample Permeability (ml / min) Example 1 13.1 Example 2 13.2 Example 3 15.5 Example 4 15.8 Example 5 17.5 Comparative Example 5.3

As shown in Table 2, in the case of the ceramic block according to the present invention, it can be confirmed that the water permeability is superior to the comparative example, and thus it is particularly useful for the production of the water permeable block.

Experimental Example 3 Absorption Rate

Absorption rate was measured for the ceramic blocks manufactured through the above examples.

Absorption rate of the prepared ceramic block specimen in a dryer and dried in an air bath at 105 ± 10 ℃ for 24 hours, cooled in a desiccator, and measured the dry weight (m ₁ ) and then measured the distance between the top of the specimen and the water surface 50- It was 60 mm and it was left to stand in water of 20 +/- 5 degreeC for 24 hours. The specimen was removed from the water and quickly wiped off the surface moisture with a cloth, and then the weight of the specimen was measured (m ₂ ) to calculate the absorption rate according to the following equation.

Sample Absorption Rate (%) Example 1 31.1 Example 2 31.3 Example 3 32.5 Example 4 34.2 Example 5 35.6 Comparative Example 21.6

As shown in Table 3, the ceramic block according to the present invention can confirm that the absorption rate is superior to that of the comparative example, so that the ceramic block can be used for various purposes.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. It can be understood that

Claims (6)

40 to 60% by weight of sewage sludge powder, 5 to 20% by weight of sand, 10 to 20% by weight of clay, 10 to 20% by weight of gypsum, 5 to 10% by weight of ash, 1 to 2% by weight of ash, 5 to 10% by weight of fiber Preparing a raw material by mixing the composition consisting of 1 to 2% by weight of calcium;
Putting the mixed raw materials into a press and forming a pressure block;
Firing and cooling the molded block in a firing furnace at 1,100 to 1,300 ° C. for 12 to 36 hours; And
A method of manufacturing a ceramic block using sewage sludge, comprising: treating the fired block with glaze and performing secondary firing at 1230-1300 ° C. for 13-15 hours. The method of claim 1,
Method of producing a ceramic block, characterized in that the step of further drying the material for 1 to 2 hours at 60 ~ 80 ℃ in a drying room after the pressure molding. delete delete 3. The method according to claim 1 or 2,
The firing and cooling process is repeated 2 to 3 times, the cooling method of producing a ceramic block, characterized in that carried out using nitrogen. Ceramic block produced by the method of claim 1.

Images