JPH11292611A - Production of brick effectively using sludge and municipal refuse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide easily usable materials having generality and useful for civil engineering and construction from sludge and municipal refuses as raw materials at a low cost. SOLUTION: This method for producing bricks effectively utilizing sludge and municipal refuses comprises directly pouring the melted slag of the burned ash of the sludge and municipal refuses in the melted state into water to granulate the slag with the water, mixing 100 wt.% of the obtained granulated slag with 20-100 wt.% of a low refractoriness clay mineral and water, kneading the mixture, press-molding the plasticized product, drying the molded product and subsequently calcining the dried molded product at 600-1,200 deg.C. The granulated slag can be used as such to simply produce bricks, and the bricks contain glass bonds due to the calcination at 600-1,200 deg.C, and thereby have permanent lives. Since the bricks can be colored with one or more pigments, the uses of the bricks are spread. The method for producing the bricks saves the expenditure of the country and municipalities as the effective utilization of general wastes and is useful for the production of the effective materials.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Technical field to which the invention belongs] As sewerage progresses,
The method of disposing of sludge generated in a sewage treatment plant has become a problem, and it is desired that sludge be used effectively if possible. As a typical disposal method, there is a method in which sludge is incinerated to form ash, and further, the ash is melted to form slag. Although this method is expensive, it has the largest volume reduction rate for disposal and is increasingly adopted in urban areas. Similarly, as a method of treating and disposing of municipal garbage that continues to increase, methods of melting and reducing the amount of incinerated ash of municipal garbage and disposing them are expanding mainly in large cities.

[0002] The present invention relates to a method for producing bricks for civil engineering construction using a large amount of these molten slags, which will be generated in the future, as a main raw material, and for effectively utilizing sewage sludge and municipal waste.

[0003]

2. Description of the Related Art Among the methods of effectively utilizing as incineration ash of sewage sludge and its molten slag and incinerated ash of municipal garbage as materials for civil engineering and construction, a method for producing bricks for pavement and bricks for houses is known. Have been done. In the case of bricks made from incinerated ash, etc., the ash is a collected ash, and is very fine with an average particle size of 20 to 30 μm, and is filled with high-pressure molding of 500 to 1000 kg / cm ² because it is a light material. It was fired at a temperature of 1000 to 1100 ° C. with increasing density.
In this method, the equipment cost of the forming press is increased, and the energy consumption for firing is also large. Similarly, when producing a fired brick from a molten slag, the slag was subjected to a pulverizing step to adjust the particle size before use. Molten slag has also been effectively used as aggregate and ballast for concrete and interlocking, and as backfill material, but its added value is small.

[0004] If cheaper, easier to use and more versatile bricks for civil engineering are developed, the range of application as a local government can be expanded, but the range of use of conventional bricks is narrow, and the cost of production is high. It is the present situation that it is too poor.

[0005]

SUMMARY OF THE INVENTION The present invention provides a method for producing bricks of excellent performance at a low cost when producing bricks for civil engineering and construction utilizing sewage sludge and municipal waste effectively. With the production method of the present invention, when using molten slag as a main raw material, instead of crushing this aggregate to form a particle size as in the past and performing high-pressure molding,
The granulated slag produced by the method of pouring molten slag in the molten state directly into water and granulating it, kneading it with clay mineral as it is, increasing the packing density by forming and forming a brick structure, and as a binder The use of clay minerals with low fire resistance and alkali metal oxides allows 600 to 12
In this method, sufficient mechanical strength can be obtained at a sintering temperature of 00 ° C.

According to the manufacturing method of the present invention, it is possible to manufacture by a low-pressure press without requiring a high-pressure press as in the prior art. In addition, since the firing temperature can be kept low, the energy consumption is small and the production can be performed at low cost. Thus, as a method of effectively utilizing sewage sludge and municipal waste, this is a method of producing high-quality bricks for civil engineering at low cost.

[0007]

The molten slag of incinerated ash of municipal garbage and sewage sludge is poured directly into water from a molten state, whereby the slag is crushed and sand-like glass is obtained.
The molten slag obtained by this method is called granulated slag. Next, the granulated slag is directly mixed and kneaded with a clay mineral to form a brick.

Clay minerals are used for imparting shape retention and plasticity to clay. The clay mineral is SK07 to SK01
(900 to 970 ° C.) low refractory degree, unused, poor clay mineral is used. The mixing ratio of clay minerals is
20 to 100% by weight based on 100% by weight of granulated slag
Is good. If the amount is less than 20% by weight, sufficient plasticity cannot be obtained at the time of molding. If the amount is more than 20% by weight, the plasticity is improved, but it is not necessary to use 100% by weight or more.
Further, if the slag is used more than this, the usage rate of the slag decreases, and the use of the slag deviates from the purpose of effective use. And 600-12
It can be sintered at a low temperature of 00 ° C.

The use of a small amount of an alkali metal oxide has the effect of lowering the sintering temperature. This alkali metal oxide to form a readily react with such SiO _2, Al ₂ O ₃ in the molten slag sludge low melt, allowing the sintering of low temperature.

[0010] Granulated slag obtained by melting incinerated ash of sewage sludge and municipal garbage and clay minerals are blended in a predetermined ratio and charged into a pan mixer, where necessary as alkali metal oxide of a binder. Sodium silicate or the like or bentonite as a low refractory clay mineral is added and kneaded together with a predetermined moisture. At this time, it is effective to knead while applying pressure in order to obtain sufficiently satisfactory plasticity. Granulated slag, clay mineral, and binder are uniformly kneaded to obtain appropriate plasticity, and then filled into a predetermined mold, and press-molded by a press. As for the press, it is possible to form an impact mold of a friction press with a device having relatively small capacity, and to perform dense molding.

The pressed brick is dried and sintered in a firing step. At this time, it is effective to use a tunnel type continuous firing furnace. The fuel used is heavy oil, gas, and electricity. Generally, a heavy oil furnace has a low energy cost, and thus is suitable for manufacturing this type of recycled brick. Next, an example will be described in detail.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS 35% by weight of granulated slag of municipal waste, 35% by weight of granulated slag of sewage sludge and unused Kibushi clay 25 of the present invention
% By weight, and 5% by weight of bentonite, and kneaded with a wet pan mixer to obtain plasticity giving sufficient moldability by adding water and correcting the mixture.
230mm long, 115m wide by friction press
m, a brick having a thickness of 50 mm was formed. 110 ° C after molding
For 24 hours and at a heating rate of 100 ° C./hr for 9 hours.
After the temperature is raised to 50 ° C., the temperature is maintained at 950 ° C. for 3 hours, and then cooled to room temperature at a cooling rate of 80 ° C./hr.

This brick has a bulk specific gravity of 2.05 g / cm ³ ,
Compressive strength 450 kg / cm ² , Flexural strength 105 g / cm ²
It was used as a pavement laying brick. At this time,
In the method of this example, the granulated slag itself of sewage sludge itself was colored brown because it contained a large amount of iron, and a calm scenery as a pavement could be provided. Also, the brick surface can be colored with pigment,
Ceramic paving with various hues has become possible.

[0014]

According to the present invention, a civil engineering construction can be manufactured by a simpler method by directly using granulated slag obtained by directly pouring molten slag of sewage sludge and municipal waste into water from a molten state. There is an effect that bricks can be provided.

[0015] Further, since it is a glass-bonded brick fired at 600 to 1200 ° C, its life is permanent,
Also, by using colorful pigments in combination, the use for pavements and buildings has increased. Furthermore, the cost of the national and local governments can be reduced for the effective use of general waste, and it can be used for the production of effective materials, so that it is possible to construct a system as a certain source of income.

Claims (1)

[Claims] 1. A low refractory clay mineral based on 100% by weight of granulated slag obtained by directly pouring molten slag of incinerated ash of sewage sludge and municipal waste into water from a molten state and granulating it.
0 to 100% by weight, water is added, kneading is performed to impart plasticity, press molding is performed, and then drying is performed.
A method for producing bricks that makes effective use of sewage sludge and municipal garbage, wherein the bricks are fired at a temperature of ° C. and used as civil engineering bricks.