JPH07185034A - Method for treating industrial waste, and treating agent - Google Patents

Abstract

PURPOSE:To stabilize the oil, heavy metal and the like in an industrial waste to allow a safety waste treatment by adding and kneading each treating agent consisting of fatty acid, quick lime, silicate and the like to the industrial waste containing the oil, liquid organic chlorine compound, and heavy metal, and mixing water thereto to react them. CONSTITUTION:To an industrial waste containing oil or liquid organic chlorine compound, and heavy metal which is put in a mixer, the same quantity or more of a treating agent consisting of about 85%-93% of quick lime, about 5%-2% of fatty acid, and about 10%-5% of silicate, or a treating agent consisting of about 65%-35% of quick lime, about 5%-2% of fatty acid, and about 30%-63% of slag dust is added, and mixed therewith. Thereafter, a necessary quantity of water is mixed thereto followed by stirring to make the industrial waste contain it, whereby the oil, liquefied organic chlorine compound such as liquid organic halogen compound, and heavy metal are solidified. The solid composition is covered with and fixed to asphalt so that the oil or liquefied organic chlorine compound contained in the industrial waste are not eluted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention mainly fixes oil contained in industrial waste, tetrachloroethylene and liquid PCB or heavy metals such as copper, chromium, lead, mercury, cadmium, cyanide and arsenic, and disposes them as safe waste. The present invention relates to a method for treating industrial waste that enables treatment and a treating agent therefor.

[0002]

2. Description of the Related Art Conventionally, oil, organic chlorine compounds and harmful heavy metals are mixed in industrial waste discharged from chemical factories, valve factories, IC production factories, machine factories, steel mills, etc. However, there is a problem that if it is discarded as it is, the environment such as soil, river and sea will be destroyed. Therefore, conventionally, oil, liquid organic chlorine compounds and contaminated soil are incinerated,
When a heavy metal is contained, it has been proposed to mix an appropriate solidifying agent such as cement to solidify the waste and dispose of the solidified product. In addition, since liquid organic molasses such as PCB is a very stable compound and is harmful,
Currently, liquid PCBs are extremely difficult to dispose of.
At the beginning of the ban on the use, some companies that have been holding the products have kept them in drums, transformers, etc. as provisional processing, and these have been stored for many years without proper processing. However, there are cases where the container leaks due to corrosion or leaks from a transformer that has been left unattended, which is extremely alarming. PCBs are currently processed by incineration, but the extremely high temperature of 1100 ℃
If the above is required and incomplete combustion occurs, dioxins are generated and secondary pollution occurs, which makes processing difficult.

[0003]

However, in the industrial waste vehicle treatment method according to the conventional example, when incinerating the industrial waste, a large incinerator is required and a huge cost is required. Further, when heavy metal is contained in industrial waste, its treatment is complicated and difficult. The present invention has been made in view of such circumstances, and makes it difficult to elute by immobilizing oil or liquid organic halogen compounds and heavy metals contained in industrial waste, or by coating and immobilizing the immobilized immobilization product particles. An object of the present invention is to provide a method for treating industrial waste and a treating agent therefor.

[0004]

In order to achieve the above object, the method for treating industrial waste according to the first aspect of the present invention provides a method for treating industrial waste containing oil or liquid organic chlorine compounds and heavy metals in a mixer with quicklime 85. % -93% fatty acid 5% -2% silicate 10% -5%, or lime 65%
~ 35% fatty acid 5% ~ 2% treatment powder consisting of fine slag dust 30% ~ 63% and quick lime 57% ~ 35% fatty acid 5% ~
2% silicate 8% to 3% Fine slag 30% to 60% of the treatment agent is added in the same amount or more and mixed, and then mixed with a necessary amount of water and stirred to be contained in industrial waste To do
It is configured to immobilize oil or liquid organohalogen compounds and heavy metals. According to the method for treating industrial waste according to claim 2, which meets the above-mentioned object, quick lime 85% -93% fatty acid 5% -2 is added to industrial waste containing oil or liquid organic chlorine compound and heavy metal put in a mixer. % Silicate 10
% To 5% or quick lime 65% to 35%
Treatment agent consisting of fatty acid 5% to 2% slag 30% to 63% and quick lime 57% to 35% fatty acid 5% to 2% silicate 8% to
A treatment agent consisting of 30% to 60% of 3% slag is added in the same amount or more than the same amount and mixed, and then a necessary amount of water is mixed and left to stir to form a solid composition, and this solid composition is converted into asphalt. It is configured so that the oil content or liquid organic chlorine compounds and heavy metals contained in industrial waste after being fixed by coating are not eluted. The treating agent according to claim 3 which meets the above-mentioned object is quick lime 85% -93% fatty acid 5% -2% silicate 1
It is composed of 0% to 5%. The treating agent according to "claim 4" according to the above object is quick lime 65% to 3%.
5% Fatty acid Fatty acid 5% to 2% Fine slag dust 30% to 63%
It is configured to consist of and. According to the above-mentioned object, the treating agent according to claim 5 is quicklime 57% -35% fatty acid fatty acid 5% -2% silicate 8% -3% slag fine dust 30%-
And 60%. The treating agent according to "claim 6" which meets the above-mentioned object is coated with a substance (5% to 2% based on quick lime) of quick lime which has a surface activity and delays the reaction. Table 1 shows the composition of the treating agent of ". Table 2. It changes as shown in Table 3.

[0005]

[Operations and Examples] Industrial waste containing oil or liquid organic chlorine compounds and heavy metals in the mixer and Table 1. Table 2. Table 3. The same amount or more than the same amount of any one of the treatment agents is mixed and mixed with water and stirred. The amount of water depends on the amount of water contained in the object to be treated.
0% by weight of water is suitable. The lime is a mixture of mercury-cadmium-copper contained in industrial waste, which is produced by hydration reaction with water to raise the temperature of the mixture to 80 ° C to 150 ° C to produce slaked lime.
lead. Heavy metal ions such as hexavalent chromium (hereinafter referred to as M ² ) and silicate (sodium silicate) or treating slag (fine powder of blast furnace granulated slag) in the treatment agent are activated and the following reaction causes heavy metal silicate. Cause M ² + Na ₂ SiO ₃ → MSiO ₂ + 2Na ⁺ By this, the heavy metal contained is taken in and insolubilized. Further, slaked lime produced by hydration of quick lime and water and sodium silicate react as in the formula to produce calcium silicate. Ca (OH) ₂ + Na ₂ SiO ₃ → CaSiO ₂ +
2NaOH Since the calcium silicate generated by this is an extremely porous substance, it has a large surface area and is excellent in adsorptivity, and adsorbs and binds unreacted heavy metals and the like to prevent elution. Further, since it is considered that the heavy metal silicate forms a manic structure and encloses the heavy metal ions therein and inactivates them, the synergistic effect of these synergistically fixes the heavy metal firmly. When the industrial waste contains oil or liquid organic halide, it is adsorbed on the generated porous calcium silicate. In addition, coated quicklime is easy to handle because it does not react exothermically with the reaction with water, and it is easy to work with. It also absorbs hydrophobic waste when it is in an aqueous multiphase system. To do. In the reaction process, quicklime, which absorbs organic waste by the water contained in or added to the aqueous multiphase system, becomes calcium hydroxide and becomes calcium silicate formed by reacting with silicate. Very fine and evenly absorbed. Fatty acids such as stearic acid and palmitic acid are suitable as surface-active substances, but petroleum fractions such as paraffin oil are also suitable. Further, the slag fine powder is vitrified, its internal structure is unstable, and it easily reacts and stores crystallization energy. Therefore, it reacts with heavy metals to form heavy metal silicates and becomes insoluble. "Claim 2"
The treatment method described is the water resistance of an asphalt having a solid composition of an industrial waste treated by the treatment method of "Claim 1" using the treatment agent of "Claim 3.4.5.6", Using physics such as hydrophobicity, weather resistance, and thermoplasticity, the surface of treated particles is covered and fixed to prevent contact with water,
Liquid PC that is difficult to dissolve and is particularly difficult to completely elute
B and ^Cr 6. Hg. As. It is possible to undetect heavy metals such as Cn. Further, the solidified product has high impact resistance, excellent leaching resistance, and is stable to acids and alkalis. Asphalt is 20% to 30% of solid processed products
120 ℃ ~ 160 ℃ by mixing heavy liquid asphalt
Knead well at the temperature to fix the coating. Also, pressure molding contributes to weight reduction. In addition, since waste liquid can be used for the treatment of liquid PCB, its merit is great.

[0006]

Example 1 The treating agent of "Claim 3" was prepared in the proportion of CaO 85% fatty acid (stearic acid) 5% silicate (sodium silicate) 10%. 100 g of the treating agent was added to 50 g of waste oil and mixed, and then water was added and stirred. 106 minutes after 8 minutes and 97 degrees after 10 minutes. It became powdery after 15 minutes. Oil before treatment 2
7.0 wt% was 2.3 wt% after the treatment.

[0007]

[Example 2] The treating agent of "claim 4" was refined in the proportions of CaO 65%, stearic acid 5%, and slag 30%. 50 g of the treating agent was mixed with 50 g of the hydrochloric acid solution and left to stand. 59 mg of mercury before treatment was not detected after treatment.

[0008]

Example 3 The treating agent of "Claim 5" was adjusted in the proportions of 62% CaO, 5% sodium silicate, 30% slag and 3% stearic acid. Waste oil (25 g), treating agent (50 g) were mixed, water (17 g) was added, and the mixture was allowed to stand. 12 minutes later 94 ° C, 20 minutes later 7
It became powdery at 0 ° C. Tetrachloroethylene 11.000 mg / l contained in waste oil was 0.035 mg / l after treatment
Met.

[0009]

Example 4 The treating agents shown in Table 1 were prepared in the proportion of quick lime 90% and sodium silicate 10%. 50g of waste oil and 100g of treatment agent
After mixing, 40 g of water was added, and the mixture was stirred and allowed to stand. 1
After 0 minutes, the mixture became powdery at 93 ° C. after 15 minutes.

[0010]

[Example 5] The treatment agents shown in Table 1 were adjusted in a proportion of quick lime 90% and sodium silicate 10%. 80 g of the treating agent was mixed with 40 g of CN waste liquid and stirred. CN2 before treatment in powder form
6.1 g / l was 5.18 ppm after treatment.

[0011]

[Example 6] The treating agent of Table 3 was adjusted with 65% quicklime and 5% sodium silicate and 30% of slag, and the same amount of an aqueous solution containing heavy metals was added to the treating agent.
After 15 minutes at ℃, it was powdery.

[0012]

Example 7 The treating agents shown in Table 3 were prepared using 65% quick lime, 5% sodium silicate and 30% slag. PCB30 in the mixer
and 90 g of the treating agent were added and mixed, 30 g of water was added, and the mixture was stirred and mixed and then allowed to stand. 96 minutes after 8 minutes, 60 after 15 minutes
Powdered at ℃. Pretreatment liquid trichloride PCB 100% was 0.014PPM after treatment.

[0013]

Example 8 The treating agent shown in Table 3 was mixed with 30 g of liquid PCB prepared by using 62% CaO, 8% sodium silicate, and 30% slag, and 90 g of the treating agent was added and mixed, and 34 g of copper sulfate solution was added and left to stir. After 9 minutes, the mixture became 95 ° C., and after 15 minutes, it became powdery.
Before treatment, 100% of trichlorinated PCB is after treatment.
No. It was D.

[0014]

Example 9 The treating agents shown in Table 3 were blended with 62% quicklime, 8% sodium silicate and 30% slag. After adding 50g of treatment agent to liquid PCB25 and mixing, 25g of waste liquid (copper sulfate solution)
The mixture was added, stirred for 3 minutes and left to stand. After curing for 1 day, 100% of trichloride PCB in the condenser before treatment became 0.02 ppm after treatment. Solid particles are further heated to about 160 ° C
After adding 22 g of heated liquid asphalt and stirring at a temperature of 120 ° C. to 160 ° C. for 5 minutes while heating, the mixture is further stirred for 5 minutes without heating to fix the coating, and 100% of trichloride PCB contained in the condenser before treatment. Was not detected.

[0015]

Example 10 The treating agent shown in Table 2 was treated with 50% CaO and 50% slag.
It was prepared in. Put 50g of treating agent in 25g of liquid PCB 4
Waste liquid (hydrochloric acid water containing 59 ppm of mercury) after stirring for 2 minutes 2
5 g was added, and the mixture was stirred and allowed to stand. 81 ° C in 7 minutes after leaving
Met. After 2 hours, 20 g of liquid asphalt heated to about 160 ° C. was charged, and the mixture was heated and stirred at a temperature of 120 ° C. to 160 ° C. for about 10 minutes to fix the coating. PCB 100% trichloride and mercury 59 ppm which entered the condenser before treatment were not detected after treatment.

[0016]

[Example 11] CaO 40%, slag 60%
50 g of the treating agent was added to 25 g of the prepared liquid PCB, and the mixture was stirred for 3 minutes. Then, 22 g of a waste liquid (hydrochloric acid water) was added and the mixture was stirred and allowed to stand. The temperature was 84 ° C. 8 minutes after standing. 1 hour after curing 1
25 g of liquid asphalt heated to 00 ° C. and heated to 160 ° C. was put therein, and stirred at a temperature of 120 ° C. to 160 ° C. for about 10 minutes to fix the coating. PCB 100% trichloride and mercury 59 ppm which entered the condenser before treatment were not detected after treatment.

[0017]

EFFECTS OF THE INVENTION As shown in the above examples, hazardous industrial waste is treated as a very safe waste by undetecting or minimizing elution and further coating and fixing solid particles with asphalt. Can be done.

[0018]

[0019]

[Table 1]

[0020]

[Table 2]

[0021]

[Table 3]

Claims (6)

[Claims] 1. A fatty acid, quicklime, silicate, or fatty acid having surface activity and slowing the reaction, which has been mixed with an industrial waste containing oil and / or liquid organic chlorine compound and heavy metal.
Oils contained in industrial waste by adding the same amount or more than each treatment agent consisting of quick lime, slag, fatty acid, quick lime, silicate, and slag and kneading them, and then mixing and reacting necessary amount of water. Alternatively, a method for treating industrial waste, which comprises fixing a liquid organic chlorine compound and a heavy metal. 2. Fatty acid, quick lime, silicate or fatty acid, quick lime, slag, and each treating agent consisting of fatty acid, quick lime, silicate and slag are added to industrial waste containing oil or liquid organic chlorine compound and heavy metal. It is characterized in that the required amount of water or a waste liquid is mixed and then reacted to make the industrial waste into a solid composition, and the solid composition is coated and fixed with asphalt to make it harmless. Processing method. 3. A treatment agent in which quick lime is mixed with a silicate and a fatty acid which has a surface activity and delays the reaction. 4. A treatment agent comprising a slag fine dust containing a fatty acid which has a surface activity and slows the reaction of quick lime, and alumina quick lime, silica, magnesium oxide and the like. 5. A treatment agent comprising a slag fine dust containing a fatty acid which has a surface activity and delays the reaction in quick lime, and a silicate and alumina, quick lime, silica, magnesium oxide and the like. 6. The treatment agent as set forth in claim 3.4.5, which is obtained by coating with a substance which has a surface active property in quick lime and delays the reaction without adding a fatty acid to the treatment agent.