JP5002096B2 - Recycled fertilizer and soil conditioner - Google Patents

Description

【００１６】
【発明の効果】
本願発明によれば、▲１▼アスベスト含有建材廃棄物を容易にリサイクルできる、▲２▼健康に有害であると言われているアスベストを不在化できる、▲３▼廃棄物を肥料や土壌改良材としてリサイクルできるので需要が莫大である、▲４▼肥料としては、けい酸質肥料だけでなく、混合石灰肥料として可溶性苦土も保証することもできる、等々の特徴、効果がある。[0001]
BACKGROUND OF THE INVENTION
The present invention is to obtain a recycled fertilizer and soil improving material in which asbestos is absent by melting inorganic building material waste containing asbestos.
[0002]
[Prior art]
Building materials containing asbestos, such as chrysotile, have been widely used as roofing and wall materials for residential and non-residential buildings for over 30 years. In particular, effective treatment methods for waste have been established. It wasn't.
[0003]
For example, as a waste disposal method for asbestos building materials, a process such as a final process is merely performed in a large lump.
[0004]
[Problems to be solved by the invention]
Building materials containing asbestos are left without an effective treatment method, and a concrete, effective and useful treatment method is desired.
[0005]
On the other hand, siliceous fertilizers are attracting attention as useful fertilizers that increase the silicic cells of rice plants, especially rice, and increase disease resistance, insect resistance, lodging resistance, etc., and are also affected by acid rain. There is a demand for fertilizers and soil amendments that can be replenished with alkali to improve soil.
[0006]
[Means for Solving the Problems]
In the present invention, asbestos is made absent by melting waste of inorganic building materials containing asbestos, and silicic acid, magnesium, etc. contained in the waste are used, silicic acid recycled fertilizer , and silicic acid. Obtain a soil amendment that replenishes alkalinity.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Inorganic building materials containing asbestos used in the present invention, the at least one and asbestos cement and calcium silicate, mainly constituted inorganic building materials, containing little nickel, chromium, harmful components such as titanium For example, flat color slate, corrugated slate, slate, calcium silicate board, slag gypsum board, ceramic siding, etc. Moreover, although these presuppose the asbestos-containing roof material and wall material waste which generate | occur | produce mainly with replacement | exchange or rebuilding, naturally the thing discarded without being used is also included.
[0008]
In general, in order to melt asbestos alone, a heating temperature of 1500 ° C. or higher is necessary, and it is difficult to melt asbestos using a conventional furnace. The melting temperature can be lowered.
[0009]
In the present invention, waste of inorganic building materials containing asbestos is melted, and since the waste often contains a silicate compound or an alkaline earth metal as a melting aid, 1500 It is also possible to melt at a temperature below ℃. In addition, when the amount of the melting aid contained is small, it is possible to lower the melting temperature by adding a melting aid such as a glass waste material.
[0010]
Of course, the setting of the melting temperature is determined in consideration of fuel cost, workability, equipment, and the like. There are various melting methods, such as an external heating electric furnace, an arc furnace, an electric furnace represented by a high-frequency heating furnace, a combustion gas furnace represented by a flat furnace, and the like. However, considering the fuel cost and the like, the waste may be crushed to a certain size and then melted .
[0011]
Although the time required for melting is not particularly limited, it is sufficient that at least asbestos contained in the building material waste is melted, and is determined by the size of the building material waste, how it is stacked, chemical components, and the like.
[0012]
After melting, quench or slowly cool with water, etc. For example, when quenching with water, the melt is crushed and granulates are obtained. It is. Of course, after slow cooling, it may be pulverized, crushed or the like in a later step, and if necessary, pulverized, crushed, granulated or the like may be performed in order to adjust the particle size in the next step.
[0013]
The resulting melt is free of asbestos, soluble silicic acid and alkali content are compatible with the official silicic fertilizers of ordinary fertilizers, and also includes magnesium, which is a magnesium component. Yes.
[0014]
In addition, for example, if lime content is necessary, it is possible to adjust by adding at least one of quick lime, slaked lime, etc., and further, it is possible to add other active ingredients of fertilizer, especially granulation It may be added in the process of making a granulated product.
[0015]
(Example)
Asbestos-containing building material waste (trade name Colonial: Table 1 composition) is fired at 1000 ° C. for 15 minutes, then pulverized by a pin mill, and about 50 g of the pulverized product is heated at about 1500 ° C. for 30 minutes. The mixture was rapidly cooled in water and pulverized in a pot mill for 4 hours after removing moisture from the rapidly cooled melt. As shown in Table 1, when the obtained powder was analyzed for fertilizer, it had an alkali content of 35.2% and soluble silicic acid of 26.2%, which was a numerical value meeting the official standard as a siliceous fertilizer. Moreover, since soluble magnesia is 6.2%, it is a numerical value suitable also as mixed lime fertilizer which guaranteed soluble magnesia.
[Table 1]

[0016]
【Effect of the invention】
According to the present invention, (1) asbestos-containing building material waste can be easily recycled, (2) asbestos, which is said to be harmful to health, can be absent, (3) fertilizer and soil improver As a fertilizer, it is possible to guarantee not only siliceous fertilizer but also soluble bitter soil as a mixed lime fertilizer, and so on.

Claims (1)

At least one with the asbestos, recycled fertilizer and soil conditioner which is characterized by being obtained by melt mainly composed inorganic building materials cement and calcium silicate.