JPH0461978A - Preparation of solidifying material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a solidifying material using raw garbage incineration ash from which heavy metals have been removed.

[Conventional technology]

BACKGROUND OF THE INVENTION Urban garbage and industrial waste generated in daily life are increasing every year with the development of economic activities, and are now attracting attention as a living environment problem.

Architectural foundation polling, dredging and tunneling, [Means for solving the problems] The present invention relates to a method for producing a solidification material that can effectively deal with these problems. That is, the present invention is a method for producing a solidified material, which is characterized in that garbage incineration ash from which heavy metals have been removed is mixed with animal bone powder, lime, and siliceous limestone powder, and then fired.

Hereinafter, a detailed explanation will be given with reference to the process diagram shown in FIG.

In the present invention, garbage incineration ash from which heavy metals have been removed is used as a raw material for the solidifying material.

That is, first, garbage incineration ash from a garbage incineration plant or the like is classified using a vibrating sieve (step S1), thereby removing solids such as iron scraps and pebbles from the garbage incineration ash.

Next, heavy metals are removed from the garbage incineration ash from which solids have been removed (step S2).

Generally, when municipal waste is incinerated, harmful heavy metals are mixed into the incinerated ash (for example, 4.8 ppm of cadmium, 2,600 ppm of lead).
Pm, chromium 540ppm, mercury 0.1ppm). Municipal garbage incineration ash is disposed of at disposal sites such as port landfills in coastal cities, and inland cities without coastlines are disposed of at land disposal sites such as mountainous areas, but incineration ash is disposed of by infiltration of rainwater, groundwater, etc. The possibility of toxic heavy metals being leached has become a social issue.

The garbage incineration ash used in the present invention is obtained by removing heavy metals during garbage incineration or from incineration ash containing heavy metals, and there is no risk of heavy metals leaching into rainwater, groundwater, etc. even when disposed of. It is something.

A method for removing heavy metals from incineration ash containing heavy metals is, for example, heating and mixing granules containing animal bone meal as an active ingredient with garbage incineration ash, thereby adsorbing the heavy metals onto the granules and removing them. can give.

The animal bone meal used in the present invention employs bones that have conventionally been mostly discarded at livestock farms, particularly bones of animals such as cows, horses, sheep, etc., which are mainly composed of hard bones.

The raw bones of these animals are cut into sizes that are easy to burn, then put into a pressure cooker and heated at about 200 to 400 degrees Celsius for about 90 minutes.
Boil for about 0 minutes. The bones were then placed in a kiln for 90
It is fired at about 0 to 1100°C for about 60 to 180 minutes, and then allowed to naturally cool in the furnace for about 60 minutes to return to room temperature or a state close to this temperature. If organic matter other than bone components such as gelatin, fat, protein, glue, etc. remains on the bone, it will cause oxidation and putrefaction, so it is important to ensure that this is removed.

By the above boiling process, organic matter adhering not only to the outside but also to the inside of the pores can be separated and removed from the bone in all directions.

By then passing through the above baking process, remaining organic matter can be completely removed, and at the same time the humidity in the bone can be reduced.
The water content can be reduced to several percent or less, preferably to almost 0%. According to the above-mentioned firing conditions, the bone turns into a skeleton and maintains its original tissue state having countless pores.

After the above firing and cooling, the bones are crushed and put into a powder machine for 2
Around 0 to 200 meshes, particularly preferably 50 to 100 meshes
It is made into powdered bone meal.

In the case of bovine bones, the above-mentioned bone powder has a yield of 40% by weight compared to raw raw bones. The particles contain calcium (approximately 33
The main components are phosphorus (about 16.7%), barium (about 1.03%), sodium (about 0.76%), sulfur (about 0.64%), and magnesium, potassium,
It is composed of chlorine, amine, iron, etc., and has countless microscopic pores that communicate with each other both inside and outside the particle. This bone meal is alkaline because it contains calcium.

Next, additives are added to and mixed with the garbage incineration ash obtained above (step S3). The additives used here are:
Animal bone meal, lime, and siliceous limestone powder are used. The animal bone meal obtained by the above method can be used. Also,
Common lime and siliceous limestone powders can be used in the form of powder or granules.In addition to these ingredients, other fillers, additives, etc. may be added as necessary.

The usage ratio of garbage incineration ash and powder of animal bone meal, lime, and siliceous limestone is usually 1 to 6 parts by weight of animal bone powder, 4 to 14 parts by weight of lime, and 1 to 6 parts by weight of animal bone powder, 4 to 14 parts by weight of lime, 6 to 19 parts by weight of siliceous limestone powder, preferably animal bone powder 2
~5 parts by weight, 6-11 parts by weight of lime, 9 parts by weight of siliceous limestone
~16 parts by weight.

Mixing of these components is carried out using a mixing mill.

Next, a solidified material is obtained by firing the obtained mixture (step S4). Firing temperature is usually 1000-140
6. For convenience of handling, the obtained solidified material is baked and then slowly cooled in step S5), weighed in step S6), and packed in bags in step S7.
), it is preferable to use this state as a product.

〔effect〕

By using the solidifying material of the present invention, it is possible to effectively process waste mud, which has conventionally been difficult to handle, and convert it into granular material that is easy to handle. That is, after roughly separating water by adding a flocculant to waste mud or using centrifugal force, the solidifying material of the present invention is added and mixed while granulating to an appropriate size. Granules are obtained by drying and calcination.

For convenience in handling the resulting granules, after firing,
It is preferable to slowly cool the product, weigh it, and package it in bags.

This granular material not only has the advantage that it can be disposed of anywhere, but also has the advantage that it can be used as a soil conditioner, a base material for paved roads, a golf course underlay material, and the like.

According to the present invention, since incineration ash can be used as a resource,
The present invention can also be an effective means for solving the problem of garbage incineration ash disposal.

〔Example〕

■Manufacture of solidification material Incineration ash (200 mesh or more) after removing heavy metals,
Mix beef bone powder, lime, and siliceous limestone powder so that the respective ratios are 80%, 3%, 7%, and 10%, and
The material was fired at 00°C and slowly cooled to obtain a solidified material.

■Example of use of solidifying material An example of treating Pauling magic (from which water has been roughly separated) using the solidifying material obtained above will be explained with reference to the process diagram shown in FIG.

First, 10 parts of the solidifying material obtained above is added to 100 parts of Pauling's Magical Soil, which has been roughly separated from water to reduce the water content to 50-70%, and mixed (Step 511). By this mixing, Pauling's magic solidified and a mixture having a predetermined viscosity was obtained.

Next, the above mixture is granulated to a diameter of about 5 mm in step S1.
2>, dried (step 813).

Next, the dried granules were fired at 600 to 1000°C (step 514) and naturally cooled (step 515) to obtain strong granules.

For convenience of handling, it is preferable that the granular material is naturally cooled, then weighed (step 516) and packed into bags (step 517) to form a product.

The above-mentioned granules were easy to handle and could be used for various purposes (soil improvement material, pavement road base material).

In addition, since the mixture obtained in the above-mentioned mixing step Sll has a predetermined viscosity, the degree of freedom in the disposal location is increased compared to the conventional case where waste mud with a high water content is discarded as it is. Therefore, it is also possible to omit steps SL2 and subsequent steps and dispose of solidified waste mud as it is.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing the manufacturing process of the solidification material of the present invention, FIG. 2 is a process diagram showing an example of the use of the solidifying material of the present invention.

Claims (1)

[Claims] A method for producing a solidified material, which comprises mixing garbage incineration ash from which heavy metals have been removed with animal bone meal, lime and siliceous limestone powder, and firing the mixture.