KR20020000613A - Ascon manufacturing method with abandoned - Google Patents

Abstract

PURPOSE: A manufacturing method of ascon using waste lime instead of lime powder is provided to save manufacturing costs and decrease environmental pollution. Also, the resultant ascon has much improved physical characteristics(density, stability and porosity) than a conventional ascon. CONSTITUTION: The manufacturing method is as follows: eliminating CO from waste lime by heating waste lime over 1000deg.C to get white powder(325mesh) as a filler; mixing with asphalt at 140-160deg.C; and mixing with stones crushed into less than 19mm in diameter), stone powder and sand.

Description

Ascon manufacturing method with abandoned}

The present invention relates to a method for producing ascon, and more particularly, to a method for producing ascon using waste lime that can be recycled to produce ascon waste lime that is difficult to dispose and processing, and adds environmental pollution.

In general, waste lime is a by-product generated in the production of soda ash, bentonite, and white cement, which amounts to 2.5 million tons per year. The waste lime generated in such a large amount is not recycled at present and is completely buried, so its disposal and disposal is serious. The landfilled lime lime not only significantly pollutes the water quality and the environment due to soil pollution or leachate discharge. Once the soil contaminated with the waste-rock can not be restored, it is urgent to take measures against this.

Therefore, in recent years, a chemical treatment method has been proposed to solve the above problems, but most of our waste lime discharges are very small and have no governmental support due to the site cost, facility input and operation. In reality, companies are not only able to apply practically, but they are forced to bury the waste lime which is discharged in huge quantities continuously while violating environmental law.

On the other hand, when manufacturing ascon, calcium carbonate, that is, expensive limestone powder, is required as a filler. As a result, ascon manufacturers often use as a cost burden for the purchase of the limestone powder to produce ascon without purchasing or using poorly fed limestone powder.

Therefore, the present invention was devised to solve the conventional problems as described above, the purpose of which is to discharge the enormous amount of the waste lime, which is a major factor of environmental pollution because it is difficult to dispose and process the pollution of ascon It is to be recycled as a raw material. Another object of the present invention is to be able to manufacture ascon cheaper to prevent the secondary pavement of the road pavement.

In order to achieve the object of the present invention and the waste lime is heated at a high temperature of 1000 ℃ or more to remove the carbon monoxide content contained in the first step of obtaining a filler in the form of a white powder; A second step of mixing the filler with asphalt at a temperature of 140 to 160 ° C. to obtain a mixture; There is provided a method for producing ascon using waste lime, which comprises a third step of mixing stone, stone powder, and sand which are pulverized to ψ19 mm or less in the mixture.

Hereinafter, a method of manufacturing ascon according to the present invention will be described in more detail by processes.

1st process

This process is to process the collected waste lime into a white powder form to be used as a filling material for ascon, the first collected waste lime is put into the hot rotary kiln as a dust collector. The injected waste lime is heated to a high temperature of 1000 ° C. or more, and thus, the unburned carbon monoxide content contained in the waste lime itself is completely burned and removed, thereby obtaining a fine white powder form of 325 mesh.

2nd process

This step is a step of mixing by mixing asphalt, which is the main raw material of ascon, to the filler obtained in the first step. When the asphalt is added and mixed in this way, when the temperature is 140 ° C. or less, the asphalt is easily solidified and difficult to mix. On the other hand, when the temperature is 160 ° C. or more, the asphalt particles are easily separated by heat, thereby liquefying the gel (G-D). This is not mixed well, so you have to consider this.

3rd process

This process is to complete the series of ascon production by mixing the stone crushed to φ19mm or less with the mixture obtained in the second process and the stone powder and sand generated in the process of crushing the stone, and mixing for sufficient mixing and stirring thereof. Plant mixers are used.

Next, the ascon production method according to the present invention manufactured by the process as described above will be described in detail according to the embodiment.

Example 1

144 g of waste lime treated as described above and 198 g of asphalt (AP-3) were heated to 150 ° C. and slowly mixed to complete mixing. 1238 g of crushed stone having a diameter of 19 mm or less at the same temperature, and 1694 g of stone powder produced in the process of crushing stone 326 g of fine sand were mixed and mixed well.

The mixture was charged into a cylindrical mold having an inner diameter of 101.6 mm and a height of 76.2 mm, chopped on both sides with a hammer and chopped 50 times, cooled to room temperature, separated from the mold, and removed from the mold and immersed in a constant temperature water bath at 60 ° C. (± 1 ° C.) for 30 minutes. A stability test was done.

Example 2

216 g of asphalt, 144 g of waste lime, 1231 g of crushed stone having a diameter of 19 mm or less were prepared and tested in the same manner as in Example 1, using 1685 g of stone powder and 324 g of sand produced during the grinding process.

Comparing the component ratio of the material used in the above embodiment is shown in Table 1 below.

[Table 1] Unit:%

ingredient Example 1 Example 2 crushed stone below ψ19mm 34.39 34.2 Stones in the process of crushing stones 47.06 46.8 sand 9.05 9.0 Waste lime 4.0 4.0 asphalt 5.5 6.0

The test results of the samples prepared according to the mixing ratios of the tables are shown in Table 2 below.

TABLE 2

KS standard value Example 1 Example 2 Density (g / cm ³ ) 2.3 or more 2.344 2.362 Stability (kg) 500 or more 1067 1123 Porosity (%) 3 to 6 3.9 3.2 Saturation (%) 70-85 78.4 84.2 Frow (1/100) 20-40 32 35

The numerical values shown in Table 2 are better than or equal to the KS standard value when the results of the Marshall test (KSF 2337) are 5.5% asphalt (first example) and 6.0% asphalt (second example). The result was obtained.

Ascon according to the present invention obtained in the above-described examples and ascon was prepared using limestone powder as a filler as in the prior art and compared the performance thereof.

216 g of asphalt, 144 g of calcium carbonate as a filler, 1231 g of crushed stone of 19 mm or less, 1685 g of stone powder generated in the process of crushing the stone, and 324 g of sand were prepared by the conventional ascon production method, and tested by the same method as described above. I saw it.

In comparison with the component ratio of Example 2 and the conventional ascon is as Table 3 below.

[Table 3] Unit:%

ingredient Example 2 Conventional Ascon crushed stone less than 19mm 34.2 34.2 Stone powder produced during the grinding of stones 46.8 46.8 sand 9.0 9.0 Filler 4.0 (waste lime) 4.0 (calcium carbonate) asphalt 6.0 6.0

The test results of the samples prepared according to the mixing ratios of the tables are shown in Table 4 below.

TABLE 4

KS standard value Example 2 Conventional Ascon Density (g / cm ³ ) 2.3 or more 2.362 2.328 Stability (Kg) 500 or more 1123 984 Porosity (%) 3 to 6 3.2 3.6 Saturation (%) 70-85 84.2 72.8 Frow (1/100 cm) 20-40 35 27

The numerical values shown in Table 4 are almost the same as the test results based on the component ratios of Table 3 in comparison with the case where the filler is used at 4% of waste lime (Example 2) and when the sample is used at 4% of calcium carbonate (Comparative Example). It can be seen as.

As described above, the present invention disposes and recycles waste lime, which is recycled as a raw material of ascon, by recycling waste lime, which has been largely landfilled and greatly contaminated water quality and environment while being discharged in huge amounts for years. It not only has the effect of significantly reducing the cost of treatment, but also has the effect of eliminating water pollution and environmental pollution caused by landfill.

In addition, the cost of ascon production is remarkable by using waste lime, which is significantly cheaper in the manufacture of ascon instead of expensive limestone powder, which has superior effect to conventional ascon in terms of physical properties such as density, stability, porosity, and saturation. Not only can it be lowered, but it also has the advantage of achieving the dual effect of preventing environmental pollution and reducing the manufacturing cost of ascon.

Claims (1)

A first step of heating the waste lime at a high temperature of 1000 ° C. or higher to remove carbon monoxide powder to obtain a filler in the form of a white powder; A second step of mixing the filler with asphalt at a temperature of 140 to 160 ° C. to obtain a mixture; Method for producing ascon using waste lime, characterized in that the mixture consisting of a third step of mixing the stone crushed to less than ψ19mm crushed stone and sand.