JP2836833B2 - Underwater casting and solidification of various incineration ash - Google Patents

Description

The present invention relates to a method for solidifying various types of incinerated ash and various slags (hereinafter referred to as various types of incinerated ash, etc.), and is particularly required for underwater lake bottoms, river bottoms, sea bottoms, and the like. The present invention relates to a method of casting and solidifying various types of incineration ash and the like in water that can be applied to various civil engineering projects that require the formation of a hard lower layer.

(Prior art)

Lime incineration ash produced at thermal power plants is discarded without any other means of use, except that it is mixed with cement and used slightly. Also, incineration ash generated in municipal solid waste incineration plants and EP ash accumulated in electric dust collectors contain harmful substances and are not useful and discarded. In addition, blast furnace slag has been mixed with cement or used as a grate material, but there has been no use that provides higher added value. In particular, since stainless slag contains heavy metals, it was avoided to mix it with cement in consideration of adverse effects on concrete, and there was no way to discard it. However, dumping the powder in the ocean results in heavy metal pollution.

When various incineration ash etc. can be solidified with sufficient strength, it can be used for construction and civil engineering business, and even if there is no specific way of use, it is convenient for transportation in the case of ocean dumping Also, there is no need to worry about pollution in stainless slag.

As a method of solidifying various incineration ash and the like, for example, in Japanese Patent Application Laid-Open No. 63-283787 filed by the present applicant, a solidification aid obtained by mixing limes, aluminum salts, sodium carbonate salts and, if necessary, cement is used. A method is disclosed. However, this method requires kneading various incineration ash or the like to which water and the above-mentioned solidifying agent have been added in advance, and has a disadvantage that it requires a great deal of labor and time.

In general, it is conceivable to solidify various types of incineration ash or the like using only cement, but in this case, a large amount of cement is required, and the cost is very high. Furthermore,
Also in this case, it is necessary to knead with an appropriate amount of water, and there is the same trouble as described above.

The present invention has been proposed in view of the above-mentioned conventional circumstances, and is a method for solidifying various types of incinerated ash or the like which only requires the addition of a small amount of a solidifying agent and does not require water kneading. The present invention is to provide a method of solidifying various types of incineration ash and the like in water, which is excellent in on-site workability.

[Means for solving the problem]

The present invention is a method of solidifying underwater such as various incineration ash in which a solidified layer is cast and formed on the water bottom using various incineration ash or the like in order to achieve the above object. 5 solidifying agents consisting of cements and aluminum sulfate
After adding 30% by weight and mixing, the mixture is directly poured into water at a solidified layer forming position to cause a reaction between the solidifying agent and various types of incineration ash and the like. A desired solidified layer is formed at a solidified layer forming position.

Also, a method of casting and solidifying various types of incinerated ash and the like in water in which a solidified body is cast and formed on the bottom of the water using various types of incinerated ash. After adding and mixing the agents by weight in an amount of 5 to 30%, the mixture is placed in a fixed or irregular shaped water-permeable container such as a bag, and the container is directly poured into water at a solidified layer forming position, and the solidifying agent and various A reaction with incineration ash and the like is caused, and a required solidified body is formed at a solidified body forming position on the water bottom without a kneading operation by these precipitations.

[Action]

The amount of lime is suitably 20 to 50% by weight of the solidifying additive (limes + aluminum sulfate + cement), but is not particularly limited.

A suitable amount of aluminum sulfate is 3 to 15% by weight. The ratio of the solidifying agent (aluminum sulfate + limes + cement) to various incineration ash is suitably from 5:95 to 30:70 (weight ratio). However, if it is desired to increase the solidification rate, the amount of the solidification additive may be increased, and if it is desired to decrease the solidification rate, the amount may be decreased.

In the above, aluminum salts of other strong acids such as aluminum chloride and polyaluminum chloride can be used instead of aluminum sulfate.

When a mixture of the solidifying agent having the above composition and various types of incineration ash is poured into water at the position where the solidified layer is formed, the solidifying agent immediately starts reacting with the incineration ash, etc., but maintains its activity until about 30 minutes. . Therefore, if the time required for sinking to the bottom of the water is short, the incineration ash or the like forms a solidified layer at the bottom of the solidified layer.

When the incinerated ash or the like mixed with the solidifying agent is immersed in water in a water-permeable container, the solidifying agent immediately starts reacting with the incinerated ash or the like and solidifies at the water bottom at the solidified body forming position.

〔Example〕

15% by weight of aluminum sulfate with 35% by weight of lime, 50% by weight of cement and 52.8% of purity for 90% by weight of fly ash
When 10% by weight of the solidifying agent is added and the mixture is poured into a beaker for about 8 minutes by using a small spoon about 10 g times, a solidified layer is formed on the bottom of the beaker in about 20 minutes.

Also, after filling a powder (solidifying agent + fly ash) having the same compounding ratio as above into a paper bag having good water permeability, and immersing it in water filled with a beaker, it solidifies in about 20 minutes to form a solidified body.

In the above two embodiments, part of fly ash,
Alternatively, it is also possible to use stainless slag instead of all. When a stainless steel flag is used, the solidification speed is significantly higher, so that the solidification speed of fly ash can be adjusted with stainless slag.

〔The invention's effect〕

As described above, according to the present invention, a mixture of various types of incineration ash and the like and a solidifying agent are used as they are or in a container, and are simply poured into the water at a required solidified layer (body) forming position such as a river bottom, thereby performing a kneading operation. Various types of incineration ash and various slag can be solidified by an extremely simple method that is excellent for on-site work without the need for hardening. If the strength is sufficient, a hardened layer (body) on the bottom of a lake, river, sea, etc. It can be widely applied to various construction and civil engineering fields. According to the above-described container housing method, the diffusion of the mixture can be limited, the solidified body can be solidified as a predetermined mass at the solidified body forming position at the bottom of the water, and the construction purpose is different from the method of directly charging the mixture. Applicable. Even when various types of incinerated ash and the like are disposed of at sea, significant advantages can be obtained in terms of transportation and pollution.

Claims (2)

(57) [Claims] An in-water solidification method for various types of incinerated ash and the like in which a solidified layer is cast and formed on the water bottom using various types of incinerated ash and the like. 5 to 30% by weight of the solidifying agent is added and mixed, and then the mixture is directly poured into water at a position where a solidified layer is formed to cause a reaction between the solidifying agent and various incineration ash and the like, and are kneaded by sedimentation thereof. A method of casting and solidifying various types of incineration ash, etc., in which a required solidified layer is formed at a position where a solidified layer is formed on the water bottom without any work. 2. A method of casting and solidifying various types of incinerated ash and the like in water, wherein a solidified body is cast and formed on a water bottom using various types of incinerated ash and the like. After adding and mixing 5% by weight or more of the solidifying agent, the mixture is placed in a fixed or irregular shaped water-permeable container such as a bag, and the container is directly poured into water at a position where a solidified layer is formed. And incineration of various types of incinerated ash, etc., and the sedimentation of these causes the required solidified material to be formed at the solidified material forming position on the water bottom without kneading work. Method.