JPH0215500B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention incorporates incinerated ash obtained by incinerating paper sludge discharged from pulp and paper factories, which was conventionally disposed of as industrial waste in landfills etc., into raw materials for inorganic building materials. The present invention relates to a method for producing lightweight inorganic building materials at low cost while reducing the weight of products, improving strength, and stabilizing dimensional changes.

A method of obtaining an inorganic building material by curing and curing a base plate made by laminating multiple pine sheets obtained by paper-making an aqueous slurry whose main components are an inorganic hydraulic raw material such as cement and a fibrous raw material such as asbestos and pulp, and a method for obtaining an inorganic building material. In order to reduce the weight of building materials, it has been known to add perlite as a lightweight filler to an aqueous slurry and obtain lightweight inorganic building materials through the same process as above. Addition of pearlite only physically mixes it into the material structure, and although weight reduction can be achieved, it has the disadvantage that mechanical strength decreases in proportion to the amount added. Furthermore, the addition of pearlites has the drawback that it is expensive and the resulting product itself is expensive. The present invention solves the above-mentioned drawbacks by adding an effective and inexpensive lightweight filler to obtain a lightweight inorganic building material. In particular, the lightweight filler can be obtained by incinerating papermaking sludge. The purpose is to effectively utilize incineration ash.

The incinerated ash obtained by incinerating the papermaking sludge used in the present invention has a light bulk specific gravity of 0.5, and its composition is 25-60% silica (SiO ₂ ) and 30-30% alumina (Al ₂ O ₃ ).
60%, ferric oxide (Fe ₂ O ₃ ) 0.3-3%, calcium oxide (CaO) 2-12%, magnesia (MgO)
It is 0.4-11% and has latent hydraulic properties.

The present invention will be described in more detail below based on Examples.

The defibrated fibrous raw materials, slag, cement, and paper sludge incineration ash are stirred and mixed using a mixer and a delinter. At that time, the weight ratio of slag and cement is 5:
Mix at a ratio of 60 to 60:5, add 10-50% by weight of fibrous raw materials to the mixture, then add 10-100% by weight of incineration ash obtained by incinerating paper sludge to the above mixture. % Add and mix. Adding incineration ash to the mixture of slag, cement, and fibrous raw materials at 10% by weight or less improves mechanical strength but increases the specific gravity; when it exceeds 100% by weight, the specific gravity decreases, but A range of 10 to 100% by weight is preferable since mechanical strength decreases. In addition, the particle size of the incinerated ash is appropriately selected depending on the dispersibility in the mixture, the screen/mesh used during papermaking, etc.
A mesh pass is preferred. The fibrous raw materials mentioned here include organic fibers such as pulp and waste paper pulp, inorganic fibers such as asbestos, and synthetic fibers.
Each of them can be used alone or by adding and mixing them in appropriate proportions. Water is added to the above mixture and mixed with stirring to obtain an aqueous slurry. The aqueous slurry has a slurry concentration of 0.5-40%. The aqueous slurry is put into a circular mesh paper making machine and filtered to obtain a thin pine containing a large amount of water, and the thin pine is laminated in multiple layers to obtain a green pine original plate. Incidentally, thick raw pine may be obtained using a Fourdrinier paper machine, an extrusion molding machine, a casting machine, etc., and used as a base plate. Next, the original plate is cured and cured, and a product is obtained by cutting it to a specified length. The original plate may be cured by either natural curing or steam curing. The resulting product is a lightweight inorganic building material in which 10-100% by weight of incinerated ash obtained by incinerating paper sludge is blended with a mixture of slag, cement, and fibrous raw materials. In this way, incineration ash can be effectively used as a lightweight filler for inorganic building materials, and
The resulting inorganic building material is not only lightweight, but also has the effect of improving mechanical strength and stabilizing dimensional changes due to the hydraulic properties of the incinerated ash. Furthermore, by using inexpensive incineration ash, lightweight inorganic building materials can be provided at low cost.

Example The main components are 5% by weight of waste paper pulp, 15% by weight of asbestos, fibrous raw material, 11% by weight of cement, and 47% by weight of slag, mixed with 22% by weight of incineration ash having a particle size of 30 mesh, and water is added to the mixture. Stir in water to obtain an aqueous slurry with a slurry concentration of 4%. After using the aqueous slurry to obtain a multi-layered pine with a size of 910 x 1820 x 6 m/m using a circular paper machine, it is naturally cured for 2 to 4 weeks, and dried for a lightweight inorganic building material with a specific gravity of 0.8 and a size of 910 x 1820 x 6 m/m. I got an A. The mechanical strength of the above product was 180 Kg/cm ² in bending strength (in the vertical direction) and 110 Kg/cm ² in the horizontal direction.

Example The main components were 11% by weight of waste paper pulp, 5% by weight of asbestos, fibrous raw material, 10% by weight of cement, and 39% by weight of slag, mixed with 35% by weight of incineration ash with a particle size of 30 mesh. Specific gravity 0.7, 910×1820
A lightweight inorganic building material B with a size of 6 m/m was obtained. The mechanical strength of the above product is bending strength (vertical direction) 130Kg/
^cm2 , (horizontal direction) 82Kg/ ^cm2 .

Claims (1)

[Claims] 1. A lightweight inorganic material whose main components are slag, cement, and fibrous raw materials, and which contains 10 to 100% by weight of incinerated ash obtained by incinerating papermaking sludge to the mixture of the main components. Building materials. 2. A method for manufacturing an inorganic building material in which green pine obtained by paper-making an aqueous slurry mainly composed of slag, cement, and fibrous raw materials is used as a base plate, and the base plate is cured and hardened. A method for producing a lightweight inorganic building material containing the obtained incineration ash. 3 The weight ratio of slag and cement is 5:60 or
Add 10% of the fibrous material to the mixture at a ratio of 60:5.
After adding ~50% by weight and further adding 10 to 100% by weight of incineration ash obtained by incinerating paper sludge to the above mixture, water is added and the resulting aqueous slurry is made into a paper sheet for raw pine, A method for manufacturing a lightweight inorganic building material by curing and hardening the original plate.