JP4494508B1 - Method and apparatus for treating sulfuric acid pitch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating sulfuric acid pitch, which generates a small amount of sulfurous acid gas and can make the sulfuric acid pitch safe, simple and simple.
SOLUTION: A stirring step in which sulfuric acid pitch is stirred and mixed without adding water to form a slurry, and neutralization is performed by adding a neutralizing agent to the obtained slurry-like sulfuric acid pitch without adding water. A sulfuric acid pitch treatment method comprising: a neutralization step to be performed; and a drying step of heating and drying a neutralized product obtained by the neutralization step.
[Selection] Figure 1

Description

  The present invention relates to a sulfuric acid pitch processing method and a processing apparatus capable of easily and easily detoxifying sulfuric acid pitch with little generation of sulfurous acid gas.

  Sulfuric acid pitch is waste acid sludge which is a mixture of waste oil and waste acid discharged from sulfuric acid treatment and sulfuric acid washing generated in petroleum refining, sulfur content, oil content, asphalt, unreacted sulfuric acid, aromatic hydrocarbons It is a tar-like material containing harmful chemical substances such as heavy metals. Further, it is a highly viscous substance that generates an acidic gas such as sulfur dioxide, and is a substance that increases in viscosity and hardens due to volatilization of oil or the like if left to stand.

Sulfuric acid pitch generates acid gas when left unattended, so it cannot be left as it is for a long time, and simply discarding it generates a large amount of acid gas and adversely affects the surrounding environment. It has been demanded.
For this reason, various methods for treating sulfuric acid pitch have been proposed.
For example, in Patent Document 1, an inorganic cement-based solidification treatment material and water are added to sulfuric acid pitch and mixed, and the oil contained in the sulfuric acid pitch is dispersed and emulsified with a surfactant contained in the inorganic cement-based solidification treatment material. Thereafter, a treatment method has been proposed in which a lime-based neutralizing agent is added to the mixture, mixed and neutralized, and then heated, dehydrated and aggregated.
Patent Document 2 discloses a uniform mixing formed by adding water to at least a part of cement-based waste material, ALC waste material, gypsum board waste material, and circulated powder particles to sulfuric acid pitch produced by petroleum refining. A treatment method in which a neutralizer and a surfactant are added to the body as appropriate and mixed, followed by heating and dehydration to obtain a powder, and at least a part of the obtained powder is circulated in the first step. Has been proposed.
In Patent Document 3, powdered basic waste and liquid acidic waste are appropriately taken out in appropriate amounts and put into a neutralization granulation tank, and these inputs are kneaded and stirred. A treatment method is proposed that granulates while softening, further processes the gas generated by the chemical reaction at this time, renders it harmless, and heats the granulated product to vaporize and separate unnecessary components. Has been.

In Patent Document 4, an aqueous solution of sodium hydroxide or potassium hydroxide as an alkaline neutralizing agent is added to a lump or tar-like sulfuric acid pitch, and dissolved and neutralized using heat generated by mixing and stirring. The sludge generated after the neutralization treatment is detoxified by adding at least one of artificial zeolite, municipal waste incineration ash R, red clay, lime (quick lime, slaked lime), and coarse cement and stirring the mixture. Has been proposed. Moreover, 1 to 4 weights of artificial zeolite, 0.5 to 4 weights of at least one of municipal waste incineration ash R, red clay, lime (quick lime, slaked lime), and coarse cement with respect to 1 to 2 weights of sulfuric acid pitch P. Adding is also disclosed.
Patent Document 5 proposes a treatment method in which sulfuric acid pitch is crushed and finely divided, neutralized, and a gas containing sulfur dioxide generated during the treatment is subjected to an absorption treatment and then a plasma decomposition treatment. ing. It is also described that it is preferable not to add water in order to suppress the generation of harmful gases containing sulfur dioxide.

JP-A-6-165999 Japanese Patent No. 3973644 JP-A-2005-161261 JP 2007-136270 A JP 2007-190544 A

However, in the processing methods described in Patent Documents 1 to 4 described above, a large amount of acid gas such as sulfurous acid gas is generated, and the sulfuric acid pitch cannot be processed safely and simply. The treatment method described in Patent Document 5 is a method in which a solid granular sulfuric acid pitch having a particle diameter of 20 mm or more is brought into contact with a solid neutralizing agent such as a sodium salt or a calcium salt and reacted. However, there is a problem that the sulfuric acid pitch cannot be made harmless. In addition, the completely solidified sulfuric acid pitch is left in a state of being opened for a long period of time, and the sulfuric acid is almost volatilized, and there is a case where neutralization treatment is not necessary.
In short, with the conventionally proposed treatment methods, the amount of generated acidic gas such as sulfurous acid gas is large and the treatment cannot be performed safely, or even if the treatment can be performed safely, the detoxification becomes insufficient, At present, it is impossible to achieve both safe, simple and simple processing and sufficient detoxification.

  Accordingly, an object of the present invention is to provide a method for treating sulfuric acid pitch, which can reduce the amount of sulfurous acid gas generated, make the sulfuric acid pitch safe, simple and simple, and to perform the treatment method simply and simply. An object of the present invention is to provide a processing apparatus that can perform the above-described processing.

As a result of intensive studies to solve the above problems, the present inventors have found that water added to make sulfuric acid pitch easy to mix with the neutralizing agent and to react with the cement used as the neutralizing agent is sulfurous acid gas. It has been found that it promotes and promotes the occurrence of As a result of further study, it was found that if the sulfuric acid pitch was sufficiently stirred until it became a slurry, it reacted with the cement and solidified without adding water, and the present invention was completed. In the present invention, the slurry form means a suspension in which a fine solid is suspended in a liquid.
That is, in the present invention, the sulfuric acid pitch is stirred and mixed without adding water to form a slurry, and the resulting slurry-like sulfuric acid pitch is added with a neutralizing agent without adding water. The above object is achieved by providing a method for treating sulfuric acid pitch, characterized by comprising a neutralization step for summing and a drying step for heating and drying the neutralized product obtained by the neutralization step It is.

Sulfuric acid pitch is in a liquid state immediately after it is generated in petroleum refining, but usually cannot be processed immediately after production, but is processed after being stored in a container such as a drum for a period of several days or more. The sulfuric acid pitch thus stored is usually at least partially solidified.
The sulfuric acid pitch used as an object to be treated in the present invention has a harmful chemical substance such as sulfur, oil, asphalt, unreacted sulfuric acid, aromatic hydrocarbons and heavy metals, and the oil is entirely contained. 5 to 10% by weight, 25 to 45% by weight of asphalt, and 25 to 45% by weight of sulfate ion including unreacted sulfuric acid. Besides these, harmful substances such as aromatic hydrocarbons and heavy metals Various substances such as chemical substances can be included. The solid content is preferably 10 to 50% by weight. By making it within this range, sufficient slurry can be achieved, and the neutralization reaction can be sufficiently performed while suppressing the generation of acid gas. Here, the solid content is a ratio of a portion recovered as a solid when separated by filtration.

The stirring step is preferably performed at a stirring speed of 5 to 40 rpm using a stirring blade having a length of 1/5 to 1/2 of the diameter of the sulfuric acid pitch container. More preferably, it is performed as Thereby, the solidified sulfuric acid pitch can also be efficiently made into a slurry suitable for neutralization.
The neutralizing agent is composed of a raw lime and cement materials are those comprising the proportions of the cement material 50 to 80 parts by weight based on fresh lime 100 parts by weight. If it is outside the above range, the neutralization process is not sufficient, Ru if there no longer be sufficient detoxification.
Or as a cement material was, Ru can be used Portland cement or the like.
Although the amount of Neutralization agent is not particularly limited, it is preferable to be 60 to 300 parts by weight with respect to the pitch 100 parts by weight of sulfuric acid, further preferably set to 80 to 180 parts by weight.
The neutralization step, while攪拌 the dispersion gradually carried out by mixing the neutralizing agent preferred. Thereby, generation | occurrence | production of acidic gas can be suppressed to the minimum and a neutralization process can be performed.
In addition, the treatment method of the present invention preferably includes a gas treatment step of neutralizing the acidic gas generated in the neutralization step in the neutralization reaction because the discharge of the acidic gas can be eliminated. It is preferable to provide a gas treatment step for neutralizing the acid gas generated by heating in the step because the discharge of the acid gas can be eliminated.
Further, the present invention is a process apparatus sulfate pitch for carrying out the processing method of the sulfuric acid pitch, and a stirring device for stirring the sulfuric pitch, the攪拌slurry-like sulfuric pitch stirrer A neutralization treatment tank for neutralization treatment, and a drying tank for heating and drying the neutralized product neutralized in the neutralization treatment tank,
The stirring device comprises a stirring blade having a length of 1/5 to 1/2 of the diameter of the sulfuric acid pitch storage container as stirring means,
The neutralization tank, and inlet for introducing攪拌slurry-like sulfuric pitch, and a discharge port for discharging the neutralized treated neutralized material, provided in a central portion of the upper surface, the medium A neutralization treatment tank gas suction port for sucking and removing the acid gas generated by the sum reaction from the tank;
The drying tank is a tank that sucks in an acidic gas generated by the drying process provided at the inlet for charging the neutralized product, the discharge port for discharging the dried product, and the central portion of the upper surface. The present invention provides a treatment apparatus for sulfuric acid pitch characterized by having a drying tank gas suction port for removal from the inside.

According to the sulfuric acid pitch treatment method of the present invention, the amount of sulfurous acid gas generated is small, and the sulfuric acid pitch can be made harmless safely, simply and simply.
Moreover, the processing apparatus of this invention can perform the processing method of the sulfuric acid pitch of this invention simply and simply.

FIG. 1 is a schematic diagram schematically showing the entire processing apparatus for carrying out the processing method of the present invention. FIG. 2 is a side view showing the stirring device of the embodiment shown in FIG. FIG. 3 is a side view showing the neutralization tank of the embodiment shown in FIG. FIG. 4 is a side view showing the neutralized product storage tank of the embodiment shown in FIG. 1. FIG. 5 is a side view showing the drying tank of the embodiment shown in FIG. 1. 6 is a perspective side view showing the first and second gas treatment tanks of the embodiment shown in FIG. 1, wherein (a) is a first gas treatment tank and (b) is a second gas treatment tank. Indicates.

Hereinafter, the sulfuric acid pitch processing method and processing apparatus of the present invention will be described in more detail.
First, the processing apparatus of the present invention for carrying out the processing method of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the treatment apparatus 1 of the present invention includes a stirring device 10 that stirs sulfuric acid pitch, and a neutralization treatment tank 20 that neutralizes the slurry-like sulfuric acid pitch stirred and dispersed by the stirring device 10. And a drying tank 40 for heating and drying the neutralized product neutralized in the neutralization tank 20.

The stirrer 10 is connected via a pipe 2 having a sulfuric acid pitch container and an exhaust fan (not shown) for sucking the surrounding air in order to process the acidic gas generated during the stirring / dispersing process. It is connected to the first gas processing tank 50. Further, the neutralization treatment tank 20 is also connected to the first gas treatment tank 50 through a pipe 3 provided with a suction device (see FIG. 3) for sucking the gas in the tank. A neutralized product storage tank 30 is provided between the neutralization tank 20 and the drying tank 40, and the neutralized product processed in the neutralization tank 20 can be processed by the drying tank 40. It can be stored up to. The neutralized product storage tank 30 is connected to the second gas processing tank 60 through a pipe 4 having an exhaust fan (not shown) for sucking air in the tank. The drying tank 40 is also connected to the second gas processing tank 60 via a pipe 5 provided with a suction means (see FIG. 3) for sucking the gas in the tank. Moreover, in this embodiment, the belt conveyor 6 is provided as a transfer means of the neutralization treatment thing from the neutralization treatment tank 20 to the neutralization treatment thing storage tank 30, and the neutralization treatment thing storage tank 30 is also provided. The belt conveyor 7 is also provided as means for transferring the neutralized product from the slag to the drying tank 40.
The gas processed in the first gas processing tank 50 and the second gas processing tank 60 is released into the atmosphere after the pH is measured by a sensor (not shown) and it is confirmed that the environmental standard is satisfied. Moreover, the processed granular material dried by the drying tank is harmless and porous particles, and is appropriately stored in a storage container (not shown) and used as a material for various forming materials.

Furthermore, it demonstrates in detail with reference to FIGS.
As shown in FIG. 2, the stirring device 10 is connected to a base portion 11 that contacts the floor surface a, a gantry portion 12 installed in a direction perpendicular to the floor surface a, and a vertical movement means 13 provided in the gantry portion 12. The stirrer support frame 10a provided with the stirrer holding portion 14 and the reinforcing member 15 and the stirrer 10b provided with a shaft 17 having two stirring blades 16 provided at a tip portion with a predetermined interval. As the vertical movement means, a rail, a chain, a hydraulic shaft, or the like is used. In this embodiment, a hydraulic shaft is used. Then, when using the stirring device 10, the stirring blade 16 is moved up and down to reach the desired depth in the sulfuric acid pitch of the drum A that is a container for sulfuric acid pitch, and the stirring blade 16 is rotated. Stir. Although the diameter of the stirring blade 16 is arbitrary according to the diameter of the drum can A to be used, it is preferably 1/5 to 1/2 of the diameter of the drum can A (the diameter of the upper surface opening).

  In the processing apparatus of the present invention, as shown in FIG. 3, a charging device 70 for charging the stirred sulfuric acid pitch into the neutralization tank 20 is provided. The charging device 70 includes a mounting table 71 for mounting a drum can containing a sulfuric acid pitch, a support column 72 for supporting the mounting table 71 so as to be movable up and down, and tilting the drum can when the drum can rises to a predetermined height to adjust the sulfuric acid pitch. It consists of a drum can inclined portion 73 which is put into a predetermined position. Although not particularly illustrated, the drum can inclined portion 73 is configured to be able to raise the drum can placed on the mounting table by hydraulic pressure and sequentially incline it toward the neutralization tank.

As shown in FIG. 3, the neutralization treatment tank 20 is composed of a cylindrical reaction vessel 21 formed so that the axial direction is the longitudinal direction, and is charged with a slurry-like sulfuric acid pitch that is stirred and dispersed. 22, a discharge port 23 for discharging the neutralized neutralized product, and a neutralization treatment for removing the acid gas generated by the neutralization reaction from the inside of the tank by being provided in the central portion of the upper surface And a tank gas suction port 24.
The charging port 22 is provided on the upper surface on one end side of the reaction vessel 21, and a funnel-shaped charging aid 22a is attached thereto. A lid 22b is provided at the top opening of the charging aid 22a so as to be freely opened and closed.
The discharge port 23 is provided on the lower surface on the other end side of the reaction vessel 21 and is provided with a valve (not shown) and normally closed so as not to discharge the contents. Is opened so that the neutralized product can be taken out. A preliminary gas discharge port 25 is provided at the upper surface position of the reaction vessel 21 facing the discharge port 23, and when the gas cannot be sucked only by the neutralization processing tank gas suction port 24, the gas is first gas processing tank. It can be released.
The neutralization treatment tank gas suction port 24 is provided in the central portion of the upper surface of the reaction vessel. Here, the “upper surface” means the surface of the portion located in the direction facing the floor surface when the reaction vessel is installed, and is true in the case of a cylindrical reaction vessel as in this embodiment. It means the surface that can be confirmed when looking at the reaction vessel from above. In addition, the “center portion” means a length that is half the length t of the reaction vessel located between the both ends of the reaction vessel and the portions 20a and 20b that are ¼ the length t of the reaction vessel. The corresponding part 20c is meant. By providing the neutralization treatment tank gas suction port 24 at such a position, the gas inside the treatment tank can be efficiently sucked, and gas leakage from the inlet 22 or the like can be prevented.
A cyclone suction device 27 is connected to the neutralization tank gas suction port 24 through a rotary valve 26 for sifting off solid matter. The suction device 27 is provided with a pipe (not shown), and is connected to the first gas processing device 50 via a gas induction blower (not shown).
Although not shown in the drawing, the reaction vessel 21 is provided with a screw-type stirring blade similar to that of a normal extrusion molding machine. The neutralized product is automatically discharged by rotating the blade. In addition, this allows the charged sulfuric acid pitch to be transferred while being neutralized, and after completion of the predetermined neutralization, it can be sequentially discharged from the outlet.

As shown in FIG. 4, the neutralized processed product storage tank 30 includes a hollow, conical top portion 31 and a hollow, cylindrical base portion 32, and the neutralized processed product transferred to the top portion 31 by a belt conveyor. A charging port 33 for charging is provided, a gas discharge port 34 for discharging the internal gas is provided at the apex portion of the top portion 31, and a pipe (see FIG. 1) provided with an exhaust fan (not shown) is provided. The second gas processing device 60 is connected to the second gas processing device 60 via the second gas processing device 60. Further, a discharge port (not shown) for discharging the neutralized material is provided in the bottom plate portion of the base portion 32 and is transferred to the dry layer 40 by the conveyors 35 and 7.
In the processing apparatus of this embodiment, as shown in FIG. 5, a quantitative supply feeder 80 is provided to quantitatively supply the neutralized processed product to the input port.

As shown in FIG. 5, the drying tank 40 includes a cylindrical drying container 41 formed so that the axial direction is the longitudinal direction, and a cylindrical heating device 42 provided so as to cover the outer peripheral surface of the drying container 41. The drying container 41 includes an input port 43 through which a neutralized product is input, a discharge port 44 through which the dried product is discharged, and an acid gas generated by the drying process provided in the central portion of the upper surface. Is provided with a drying tank gas suction port 45 for sucking and removing from the tank. Here, the meanings of “upper surface” and “central portion” are as described in the description of the neutralization treatment tank. The input port 43 is provided on the upper surface on one end side of the drying container, and the discharge port 44 is provided on the lower surface on the other end side. The granular material obtained after the baking process is put into the storage container 47 via the belt conveyor 46. The drying tank gas suction port 45 is directly connected to a cyclone suction device 48 through a pipe (see FIG. 1), and is connected to a second gas processing tank through a gas cooling condenser 49.
Although not shown in particular, a rotary blade capable of extruding the contents is provided inside the drying container 41, and the neutralized product that has been charged is transferred while being heated, and the drying process for a predetermined time is completed. It can be discharged from the outlet sequentially.
As a heating method of the heating device 42, various known methods such as an electric method and a combustion method can be employed without any particular limitation.

Since the 1st gas processing tank 50 and the 2nd gas processing tank 60 are comprised similarly, a 1st gas processing tank is demonstrated with reference to Fig.6 (a). About the structural member of a 2nd gas processing tank, the same number as a 1st gas processing tank is shown, and description is abbreviate | omitted about the same part.
The first gas treatment tank 50 includes a main body 51 that is a rectangular box-shaped hollow box, a solid content discharge unit 52 that has a slope on the lower surface provided on one end surface thereof, and the other end of the main body 51. The exhaust nozzle 53 is provided on the upper side surface. A first suction port 54 to which a pipe from the stirrer is connected and a second suction port 55 to which a pipe from the neutralization tank is connected are provided on the upper surface on one end side of the main body 51.
In addition, an alkaline solution shower unit 56 for spraying an alkaline solution over the entire interior of the main body 51 is provided above the main body 51, and an alkaline solution S is present in the lower half of the main body 51. Inside the main body 51, a plurality of partition plates 57 are arranged alternately in the vertical direction. Thus, the acid gas can be sufficiently neutralized. Further, on the lower surface side of the main body 51, a conveyor 58 is provided for recovering the powder sucked together with the non-treatment gas and the solid content generated by the neutralization reaction. The conveyor 58 is disposed up to the solid content discharge section 52, and the solid content can be discharged from a discharge port 52a provided on the lower surface of the solid content discharge section at the conveyor end 58a located at the end of the slope. .
In addition, a measurement unit 53a for measuring the pH of the gas is provided at the tip of the exhaust nozzle 53. If the exhaust gas does not satisfy the environmental standards, the exhaust is stopped by stopping the suction of the gas. The supply amount of the alkaline solution can be adjusted.
The alkaline solution S in the lower part of the main body 51 is supplied to the upper alkaline solution shower part 56 via a pump 59 provided outside the main body, and the pH is appropriately measured to be less than pH 11 Is configured to be supplied with an alkali material immediately. Here, as the alkali material, a known alkali material such as sodium hydroxide can be used without particular limitation.
In the second gas treatment tank 60, the first suction port 54 is connected to the neutralized product storage tank, the second suction port 55 is connected to the drying tank, and the gas from the drying tank is cooled. It is the same as the first gas processing tank except that a cooler (not shown) is provided so as to be able to do so.

Next, the processing method of this embodiment will be described with reference to the drawings.
In the treatment method of the present invention, first, using the stirring device shown in FIG. 2, the sulfuric acid pitch is stirred and mixed without adding water to form a slurry.
At this time, the stirring speed is preferably 5 to 40 rpm, more preferably 5 to 30 rpm, from the viewpoint of sufficiently forming a slurry while suppressing the generation of acidic gas.
Thereafter, the slurry-like sulfuric acid pitch is put into the neutralization tank without adding water. After completion of charging, neutralization is performed by adding a neutralizing agent. The neutralization step is performed by gradually mixing the neutralizing agent while stirring and mixing the sulfuric acid pitch. Here, “gradually” means that the temperature in the treatment tank does not increase so much. Specifically, the temperature in the tank is preferably 100 ° C. or less, more preferably 80 ° C. or less, and most preferably A predetermined amount of neutralizing agent is divided and added while confirming the temperature in the tank so that the temperature is 70 ° C. or lower.
When neutralizing the acidic gas generated by the neutralization reaction in the neutralization process in the first gas treatment tank, the alkaline solution is adjusted so that the pH of the exhaust gas measured by the measurement unit is within a certain range. The amount and pH of the shower (usually 11 but may be adjusted to a pH exceeding 11 in some cases) can be appropriately adjusted. The same applies to the second gas treatment tank.
The heating temperature and time in the drying step are arbitrary depending on the amount of oil contained, but the heating temperature is preferably 400 to 500 ° C. and the time is preferably 5 to 20 minutes.
The neutralization step and the drying step are preferably performed continuously.
By passing through these steps, the sulfuric acid pitch can be rendered harmless and a porous granular material can be obtained.
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not restrict | limited to these.
[Examples 1-7]
A processing apparatus shown in FIGS. 1 to 6 was used to treat sulfuric acid pitch having a solid content of 40% by weight (in which the upper part of a storage drum can be solidified) under the conditions shown in Table 1. The drying was performed at 450 ° C. for about 10 minutes.
The cement material used is Portland cement (manufactured by Nippon Cement Co., Ltd.), and the amount of neutralizing agent added is 120 parts by weight with respect to 100 parts by weight of sulfuric acid pitch.

* Addition method a: The neutralizing agent was gradually added so that the temperature of the neutralization tank did not exceed 80 ° C.
How to add b: First, all of the neutralizing agent was added.

Example 7
The treatment was performed in the same manner as in Example 1 except that sulfuric acid pitch having a solid content of 5% by weight was used.
Example 8
The treatment was performed in the same manner as in Example 1 except that sulfuric acid pitch having a solid content of 60% by weight was used.
[Evaluation]
In the treatment method of Example 1, the amount of acid gas generated is not so large, and the neutralization treatment can be performed while the acid gas generated from the neutralization tank is sufficiently treated with an alkaline shower (10 liters) of pH 11. It was possible to obtain a neutral, black and harmless granular material.
In the treatment methods of Examples 2 and 4, neutralization treatment could be performed with a small amount of acid gas generated compared to the conventional method, but compared with Example 1, the amount of acid gas generated was large and the pH 11 alkaline shower ( 10 liters) was not sufficient, and a 20 liter alkaline shower had to be used.
In the treatment method of Example 3, the neutralization treatment could be performed with a small amount of acid gas generated compared to the conventional method, but the neutralization treatment took longer than in Example 1.
In the treatment methods of Examples 5 and 8, the neutralization treatment could be performed with a small amount of acid gas generated compared to the conventional method, but the slurry formation was insufficient compared with Example 1, and the neutralization treatment took time. It took.
In the treatment method of Example 6, neutralization treatment could be performed with a smaller amount of acidic gas compared to the conventional method. However, compared with Example 1, a large amount of acidic gas was generated in the stirring step, and the pH 11 alkaline shower was performed. (10 liters) was not sufficient, and it was necessary to use a 20 liter alkaline shower.
In the treatment method of Example 7, neutralization treatment could be performed with a small amount of acid gas generated compared to the conventional method, but compared with Example 1, the amount of acid gas generated was large, and the pH 11 alkaline shower (10 liters) was used. ) Was not sufficient, and a 20 liter alkaline shower had to be used.

  The treatment method of the present invention can efficiently detoxify harmful waste, and the granular material obtained by the treatment is harmless and porous particles, and is a raw material for various molding materials such as paving materials, building materials, and cement materials. Can be used as

1 treatment device; 2, 3, 4, 5 piping; 10 stirring device; 11 base; 12 frame part; 13 vertical movement means; 14 stirrer holding unit; 15 reinforcing member; 10a stirrer support frame; 10 neutralization tank; 21 reaction vessel; 22 inlet; 23 outlet; 24 neutralization tank gas suction port; 26 rotary valve; 27 suction device; 30 neutralized product storage tank; 31 top; 33 inlet; 34 gas outlet; 40 drying tank; 41 drying vessel; 42 heating device; 43 inlet; 44 outlet; 45 drying tank gas suction port; 48 suction device; 49 condenser; 50 first gas Treatment tank; 60 second gas treatment tank; 51 main body; 52 solid content discharge unit; 53 exhaust nozzle; 54 first suction port; 55 second suction port; 56 alkaline solution shower unit; 57 partition plate; 5 Pump

Claims (4)

Stirring step in which sulfuric acid pitch is stirred as it is without adding water to form a slurry,
Neutralization process to neutralize by adding only quick lime and cement material as neutralizer without adding water to the obtained slurry-like sulfuric acid pitch, and heat the neutralized product obtained by the neutralization process And drying step to dry,
The sulfuric acid pitch used in the stirring step has a solid content of 10 to 50% by weight, and the stirring step uses a stirring blade having a length of 1/5 to 1/2 of the diameter of the sulfuric acid pitch container, The stirring speed is 5 to 40 rpm,
The method for treating a sulfuric acid pitch, wherein a mixing ratio of the quicklime and the cement material is 50 to 80 parts by weight of the cement material with respect to 100 parts by weight of quicklime.   2. The method for treating a sulfuric acid pitch according to claim 1, wherein the neutralizing step is performed by gradually mixing the neutralizing agent while stirring the slurry-like sulfuric acid pitch.   2. The method for treating a sulfuric acid pitch according to claim 1, further comprising a gas treatment step of neutralizing an acidic gas generated in the neutralization step with a neutralization reaction.   The method for treating a sulfuric acid pitch according to claim 1, further comprising a gas treatment step of neutralizing an acidic gas generated by heating in the drying step.