TWI778609B - Preparation of compositions with high stability emulsified asphalt - Google Patents

Abstract

The invention discloses a preparation of compositions with high stability emulsified asphalt and the preparation steps include: Adding a water, a hydrochloric acid, an emulsifier and a mixed salt into a reaction vessel; The reaction vessel is rotated and heated to form a mixed solution with a rotating speed of 150 rpm and a heating temperature of 80 ℃; Mixing the mixed solution with an asphalt heated to 120 ℃ and homogenizing for 2 minutes to form a mixture; and rotate and stir to cool the mixture to make the composition of emulsified asphalt. The rotation speed is 200 rpm and the mixture is stirred to cool for 50 minutes.

Description

Process for producing a composition with high stability emulsified asphalt

The present invention mainly relates to a process for the preparation of a composition of emulsified asphalt with high stability, in particular to a method of applying industrial waste salts of various salts to the emulsified asphalt to improve the storage stability of the emulsified asphalt.

Emulsified asphalt is a mixture of asphalt cement, water and emulsifier. Emulsified asphalt exists in liquid form at room temperature. Because asphalt cement is insoluble in water, the particles with a diameter of about 0.025~0.125mm are suspended in water, and the emulsifier has a positive or negative charge depending on the composition, causing the repulsive behavior between the particles, but it can remain in liquid form at room temperature. Existing, the emulsifier mixed with water has different water evaporation rates according to its chemical composition. Based on the consideration of economic benefits and environmental pollution, emulsified asphalt replaces traditional hot mix asphalt (HMA) in the construction and maintenance of pavement, and there is an increasing trend, especially in Europe and the United States and mainland China, emulsified asphalt has partially replaced HMA In the application of pavement, the quality after use is not inferior to the traditional hot mix asphalt.

Asphalt Emulsion is a mixture of two immiscible substances including asphalt and water. The main characteristics are the stability during storage and mixing, the viscosity of the surface treatment and the curing speed. Many of these properties are determined by particle size and particle distribution in the emulsion, and vary with the type of asphalt, the equipment used to produce the emulsion, and the in-service stability of the chemicals. Usually emulsified asphalt is made by mixing asphalt cement, water and emulsifier, and the emulsified asphalt remains liquid at room temperature. Because asphalt cement is insoluble in water, it is suspended in water as particles (about 0.025~0.125mm in diameter).

However, according to the National Standard of the Republic of China (CNS) 10365 K6782 "Method of test for settlement and storage stability of emulsified bitumen", 60% high-concentration emulsified bitumen, the stability specification is After standing for 5 days, the weight difference between the upper and lower emulsions must be less than 5%. However, the conventional emulsified asphalt cannot maintain the emulsified state for a long time, and the flocculation phenomenon of the asphalt is likely to occur within a few days of storage, and even coalescence of the asphalt occurs. It will not only fail to comply with the aforementioned regulations, but also make the emulsified asphalt unusable, and the agglomerated asphalt may block the tank or pipeline, thus causing great damage.

The purpose of the present invention is to provide a process for preparing a composition of emulsified asphalt with high stability, which is to prepare emulsified asphalt with industrial waste salts (mixed salts) to enhance the stabilization effect.

In order to achieve the above object, the present invention provides a process comprising: a composition with high stability emulsified asphalt, the steps comprising: adding a water, a hydrochloric acid, an emulsifier and a mixed salt into a reaction vessel; Rotate and heat the reaction vessel with a rotating speed of 150 rpm and a heating temperature of 80° C. to form a mixed solution; the mixed solution and a pitch heated to 120° C. are homogenized for 2 minutes to form a mixture ; And the mixture is rotated and stirred for 50 minutes at a rotational speed of 200 rpm and stirred and cooled to make the composition of the emulsified asphalt.

In some embodiments, the emulsifier is selected from the group consisting of cationic emulsifiers, anionic emulsifiers and nonionic emulsifiers.

In some embodiments, the mixed salt is obtained from an industrial waste salt. .

In some embodiments, the industrial waste salts are by-products of a process for removing harmful heavy metals from materials.

In some embodiments, the mixed salts comprise at least two of calcium chloride, sodium chloride, and magnesium chloride.

In some embodiments, a secondary object of the present invention is to provide a composition having high stability emulsified asphalt. In order to achieve the above object, the present invention provides a composition comprising 0.1% to 2% by weight of an emulsifier, 0.1% to 1.8% by weight of mixed salts, 20 to 60% by weight of asphalt, and the remaining components are water.

The characteristics of the present invention are as follows: the present invention utilizes industrial waste salts, and at a low concentration of 30%, the low addition ratio can have an additive effect on the stability of the emulsified asphalt for 5 days in regulations, and even has a chance to exceed the stability for more than 30 days.

11: Initial Materials

12: Water

13: Acid solution

131: Waste acid

132: pure acid

14: Oxidant

2: Pickling tank

21: Slurry

22: pH meter

23: pH control unit

3: The first buffer tank

31: Slurry

32: Coagulant

4: First filter

41: fine particles

42: Slurry

43: Water

44: Powder

5: Rotary Kiln

51: Hopper

52: Material fly ash

6: The second buffer tank

61: Neutralization tank

611: Lime Water

62: The third buffer tank

63: Second filter

631: Water

64: Drying and dehydration

641: Metal Hydroxide

7: Fourth buffer tank

8: Vacuum concentration unit

81: High salt brine

82: Drying and dehydration

821: Industrial salts

P1: heavy metal dissolution test curve

P2: Variation curve of different liquid-solid specific viscosity

S11~S14: Manufacturing steps of compositions with high stability emulsified asphalt

S21~S26: Process steps for removing harmful heavy metals in materials

S21~S43: the process of removing harmful heavy metals in materials and its derivative process steps

[Fig. 1] is a flow chart of the preparation of the composition with high stability emulsified asphalt according to an embodiment of the present invention; [Fig. 2] is a graph of the kinetic test curve of heavy metal dissolution applied in the process of removing harmful heavy metals in materials of the present invention; [Fig. Fig. 3 is a graph showing the variation of different solid-liquid specific viscosity applied in the process of removing harmful heavy metals in materials of the present invention; [Fig. 4] is the parent process of the derivative process of obtaining salts of the present invention; [Fig. 5] is the obtaining process of the present invention The derivation process of salts; [Fig. 6] is a schematic flow chart of the processing method of Fig. 4 and Fig. 5; [Fig. 7A] is an embodiment of the present invention adding the amount of the salt solution with calcium chloride to the emulsified asphalt and five The histogram of the storage concentration for one day; [Fig. 7B] is a histogram of the amount of the salt solution with sodium chloride added to the emulsified asphalt and the storage concentration for five days according to an embodiment of the present invention; [Fig. 7C] is an implementation of the present invention. Example of the comparison histogram of the amount of salt solution with magnesium chloride added to the emulsified asphalt and the storage concentration for five days; [Fig. 8A] is an embodiment of the present invention when adding two mixed salt solutions of different concentrations to 30% emulsified asphalt five A histogram of the effect of day stability; [ Fig. 8B ] is a histogram of the effect of different sodium chloride concentrations on the five-day stability of 30% emulsified asphalt under the addition of three mixed salt solutions of different concentrations according to an embodiment of the present invention.

Hereinafter, the embodiments of the present invention will be described in detail in conjunction with the drawings. The accompanying drawings are mainly simplified schematic diagrams, and only illustrate the basic structure of the present invention in a schematic manner. Therefore, only the elements related to the present invention are indicated in these drawings. , and the displayed components are not drawn according to the number, shape, size ratio, etc. of the actual implementation. The size of the actual implementation is actually a selective design, and the layout of the components may be more complicated.

The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in accordance with which the invention may be practiced. The directional terms mentioned in the present invention, such as "up", "down", "front", "rear", "left", "right", "inside", "outside", "side", etc., are only for reference Additional schema orientation. Therefore, the directional terms used are for describing and understanding the present invention, not for limiting the present invention. Additionally, in the specification, unless explicitly described to the contrary, the word "comprising" will be understood to mean the inclusion of stated elements but not the exclusion of any other elements.

Please refer to FIG. 1 , the manufacturing process of the composition with high stability emulsified asphalt disclosed in this embodiment includes:

Step S11 : adding a water, a hydrochloric acid, an emulsifier and a mixed salt into a reaction vessel (not shown), which is in the state of an aqueous solution.

Step S12: Rotate and heat the reaction vessel, the rotating speed is 150 rpm, and the heating condition is to heat to 80° C., so that the substances in the reaction vessel form a mixed solution.

Step S13: Homogenize the mixed solution with asphalt in an oil phase state and heated to 120° C. for 2 minutes to form a mixture.

Step S14: Rotate and stir to cool the mixture to make the combination of emulsified asphalt The rotating speed of the operating parameters was 200 rpm, and the stirring and cooling were carried out for 50 minutes.

The composition of the high-stability emulsified asphalt composition prepared by the aforementioned process of the present invention comprises 0.1% to 2% by weight of an emulsifier, 0.1% to 1.8% by weight of mixed salts, and 20 to 60% by weight of an emulsifier. % asphalt, and the rest is water.

The aforementioned emulsifier is selected from the group consisting of cationic emulsifier, anionic emulsifier and nonionic emulsifier. Specifically, the cationic emulsifier can be octadecyltrimethylammonium chloride or cetyltrimethylammonium chloride, and the anionic emulsifier can be sodium lauryl sulfate or dodecyl Sodium benzenesulfonate, the nonionic emulsifier can be alkylphenol polyoxyethylene ether. Of course, the aforementioned types of emulsifiers added to the asphalt can be combined and mixed at the same time.

The mixed salts of the foregoing embodiments can be obtained from an industrially discarded high-salt brine or an industrially discarded industrial salt, such as the product of a derivative process in a "removal of harmful heavy metals from materials". For example, as shown in FIG. 2 to FIG. 6 , in the content shown in FIG. 2 , FIG. 3 and FIG. 4 , step S21 to step S26 disclose the above-mentioned process for removing harmful heavy metals in the material, and the steps include: a setting step (Step S21), the pH value of the initial reaction time in a heavy metal dissolution test curve graph P1 (horizontal axis is time, vertical axis is pH value) is compared according to the pH value of an initial material 11, and the closest value is obtained. A liquid-solid ratio corresponding to the curve of the pH value, and then according to the liquid-solid ratio through a different liquid-solid ratio viscosity change curve P2 (the horizontal axis is the liquid-solid ratio, and the vertical axis is the viscosity), find out the liquid-solid ratio with the liquid-solid ratio. A viscosity value corresponding to the solid ratio is used as the initial viscosity value of the initial material 11; a pickling operation step S22: the initial material 11, a water 12 and an acid solution 13 that meet an initial ratio are added to an acid cleaning The tank 2 is uniformly stirred into a slurry (for example, using a motor stirrer), so that the heavy metals in the initial material 11 react with the water 12 and the acid solution 13 to elute the heavy metals. The initial material 11 and the water 12 The ratio of 2 is in line with the initial viscosity value, and the pickling operation step (step S22) further includes a pH control unit 23 for detecting the pH value of the slurry 21 in the pickling tank 2 and adjusting the pickling tank. 2. The ratio of the pH value of the slurry 21, so that the pH value of the slurry 21 and the reaction The corresponding relationship of time conforms to the selected curve change of the heavy metal dissolution test curve P1, so that the best heavy metal dissolution can be carried out with a relatively saved water amount within the same reaction time. The initial ratio of the initial material, water and acid solution The weight ratio of the acid is 1:4~7:1~4 in sequence; a first quantitative output step S23: the slurry 21 in the pickling tank 2 after the pickling operation is input into a first buffer tank 3, and output a slurry 31 with a controllable output volume to the first buffer tank 3. Of course, in order to increase the precipitation effect of the first buffer tank 3, a coagulant can be added to the first buffer tank 3. 32; a first filtering step S24: a first filter 4 is used to collect a plurality of fine particles 41 of carbon particles and heavy metal components in the slurry 31 output from the first buffer tank 3; a drying and crushing step S25 : used to remove the moisture of the slurry 42 passing through the first filter 4, and then form a dry solid, so that its temperature can be controlled more accurately, and then pulverize the dry solid to form a uniform particle size, no agglomeration The powder 44; a rotary kiln cracking step S26: the powder 44 is cracked with a uniformly heated rotary kiln, and a hopper 51 is used to collect the material fly ash 52 produced by the cracking, so as to obtain A fly ash slag 52 for removing harmful substances; as shown in FIG. 5 , the above-mentioned derivative process (which can produce industrial salts) of the process for removing harmful heavy metals in the material, the steps are as follows: following step S24, a first The second buffer tank 6 collects the fine particles 41 containing heavy metals collected by the first filter 4 in the first filtration step (step S24); an acid-base neutralization step S32 is to quantify the second buffer tank 6 The output fine particles 41 are sent to a neutralization tank 61, and a lime water 611 solution that is uniformly mixed with water and a lime is added to the neutralization tank 61, and uniformly mixed in the neutralization tank 61 (for example, with a motor A third quantitative output step S33, a third buffer tank 62 is used to collect the slurry in the neutralization tank 61 and quantitative output; a second filtering step S34, a second filter 63 is used to collect the slurry The third buffer tank 62 The outputted slurry (a plurality of fine particles containing carbon particles and heavy metal components); a drying and dehydration step S35, drying and dehydrating the slurry passing through the second filter 63 to obtain a product of metal hydroxide 251; After step S34, a fourth quantitative output step S41 is performed: a fourth buffer tank 7 is used to collect the fine particles collected by the second filter 63 of the second filtration step (step S34); a vacuum concentration Step S42: quantitatively outputting the slurry from the fourth buffer tank 7 to a vacuum concentration unit 8, and concentrating the slurry into high-salt brine 81; and a drying and dehydration step S43: drying the high-salt brine 81 Dehydration 82 process to prepare the industrial salts 821.

The mixed salts in the manufacturing process of the high-stability emulsified asphalt composition of the foregoing embodiments include at least any two or three of calcium chloride, sodium chloride and magnesium chloride.

Please refer to the histogram of the amount of the salt solution with calcium chloride added to the emulsified asphalt and the five-day storage stability shown in FIG. 7A , and the amount of the salt solution with sodium chloride added to the emulsified asphalt in FIG. 7B . The histogram of the five-day storage stability and the histogram of the amount of the salt solution with calcium chloride added to the emulsified asphalt and the five-day storage stability shown in Figure 7C, in the traditional practice, a single salt is added to the emulsified asphalt. The addition ratio of calcium chloride is about 1%~5%, but its contribution to the stability of emulsified asphalt is limited. Under the concentration, the stability of 30% emulsified asphalt is not good for five days; Figure 7B shows that the single salt of sodium chloride added at different concentrations such as 1%, 0.75%, 0.5%, etc., is stable to 30% emulsified asphalt for five days. The stability is still not good; and Figure 7C shows that the stability of the 30% emulsified asphalt for five days is still not good when the single salt of magnesium chloride is added at different concentrations such as 1%, 0.75%, and 0.5%.

However, please refer to FIG. 8A again, the effect of adding two kinds of mixed salts to the emulsified asphalt. In this embodiment, 1% calcium chloride and 1% magnesium chloride, etc. are simultaneously added to the emulsifier of the emulsified asphalt Mixed salts can obtain a five-day storage stability of 0.88%; and mixed salts such as 1% calcium chloride and 1% sodium chloride are added to the emulsifier to obtain a five-day storage stability of 0.24%; Adding mixed salts such as 1% sodium chloride and 1% magnesium chloride can obtain a five-day storage stability of 0.01%. As shown in Figure 8B, in the emulsifier added to the emulsified asphalt, if 1% calcium chloride and 0.5% magnesium chloride are fixed first, and then different concentrations of sodium chloride are compared: such as 0.2%, 0.5%, 1% and 1.5%. The five-day storage stabilities of 1.27%, 2.41%, 0.23% and 0.09% were obtained, respectively. From this, it can be seen that when two or more kinds of salts are mixed, the effect of the 5-day storage stability of the regulations can be met as long as the addition amount is low.

To sum up, the present invention applies an industrial waste salt product derived from the process of removing harmful heavy metals in the material, and the mixed salts such as calcium chloride, sodium chloride and magnesium chloride are mutually controlled at a low addition ratio of 0.1%~ Between 2%, it can have an excellent additive effect on the storage stability of emulsified asphalt within 5 days of the regulations. The present invention can be used for the waste salt products produced in the industrial production process

The embodiments disclosed above are only illustrative of the principles, features and effects of the present invention, and are not intended to limit the scope of the present invention. Modifications and changes are made to the above-described embodiments. Any equivalent changes and modifications made by using the contents disclosed in the present invention should still be covered by the following claims.

S11~S14: Manufacturing steps of compositions with high stability emulsified asphalt

Claims (5)

A process for producing a composition of emulsified asphalt with high stability, the steps comprising: adding a water, a hydrochloric acid, an emulsifier and a mixed salt in a reaction vessel, wherein the mixed salt is taken from an industrial waste High-salt brine or an industrially discarded industrial salt; rotate and heat the reaction vessel with a rotating speed of 150 rpm and heating to 80 ° C, so that the contents of the reaction vessel form a mixed solution; this mixed solution is heated to 120 ° C. The asphalt was homogenized for 2 minutes to form a mixture; and the mixture was rotated, stirred and cooled at a speed of 200 rpm and agitated and cooled for 50 minutes to prepare the emulsified asphalt composition. The manufacturing process of the composition with high stability emulsified asphalt according to claim 1, wherein the emulsifier is selected from the group consisting of a cationic emulsifier, an anionic emulsifier and a nonionic emulsifier. The process for producing a composition with high stability emulsified asphalt according to claim 1, wherein the industrially discarded high-salt brine or an industrially discarded industrial salt is a product of a derivative process of a process for removing harmful heavy metals from materials, and the derivative The process includes: a setting step, which is based on the pH value of an initial material compared with the pH value of the initial reaction time in a heavy metal dissolution test curve to obtain a liquid-solid ratio corresponding to the curve closest to the pH value , and then according to the liquid-solid ratio through a different liquid-solid ratio viscosity change curve, find out a viscosity value corresponding to the liquid-solid ratio as the initial viscosity value of the initial material; a pickling operation step, which will meet the An initial ratio of the initial material, water and an acid solution is added to a pickling tank and stirred uniformly to form a slurry, so that the heavy metals in the initial material react with the water and the acid solution to elute the heavy metals. The proportion of water is adjusted to meet the initial viscosity value, and the pickling operation step includes a pH value control unit for detecting the pH value of the slurry in the pickling tank and adjusting the pH value ratio of the slurry in the pickling tank , so that the corresponding relationship between the pH value of the slurry and the reaction time conforms to the selected curve change of the heavy metal dissolution test curve diagram, and the weight of the initial material, water and acid solution of the initial ratio is The quantity ratio is 1:4~7:1~4 in sequence; a first quantitative output step is to input the slurry in the pickling tank after the pickling operation into a first buffer tank, and the The first buffer tank carries out a slurry output with a controllable output volume; a first filtration step uses a first filter to collect a plurality of fine particles of carbon particles and heavy metal components in the slurry output from the first buffer tank; A drying and pulverizing step is used to remove the moisture of the slurry passing through the first filter to form dry solids, and then the dry solids are pulverized to form powders with uniform particle size; a rotary kiln cracking step, A rotary kiln is used to crack the organic matter in the powder, and a hopper is used to collect the material fly ash produced by the cracking; a second quantitative output step is to use a second buffer tank to collect the first filter step. The fine particles collected by a filter; an acid-base neutralization step, which is to quantitatively output the fine particles from the second buffer tank to a neutralization tank, and add a uniform mixed solution of water and lime into the neutralization tank. In the neutralization tank, and evenly mixed in the neutralization tank; a third quantitative output step, a third buffer tank is used to collect the slurry in the neutralization tank; a second filter step, a second filter is used to collect the The slurry containing a plurality of fine particles of heavy metal components output from the third buffer tank; a fourth quantitative output step is to collect the fine particles collected by the second filter of the second filtering step with a fourth buffer tank particles; a vacuum concentration step, which is to quantitatively output the slurry from the fourth buffer tank to a vacuum concentration unit, and concentrate the slurry into high-salt brine; and a drying and dehydration step, which is to dry and dehydrate the high-salt brine , to prepare the industrial salts. The manufacturing process of the composition with high stability emulsified asphalt according to any one of claims 1 to 3, wherein the mixed salts comprise calcium chloride, sodium chloride and magnesium chloride. The manufacturing process of the composition with high stability emulsified asphalt according to any one of claims 1 to 3, wherein the mixed salts comprise calcium chloride and magnesium chloride.

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