JPS59137362A - Manufacture of refractory lightweight construction 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 The present invention relates to a method of manufacturing a fire-resistant lightweight building material.

Fly ash has traditionally been effectively used as an additive for cement, but currently, 12 million to 13 million
As much as 1,000,000 tons of -N is generated, and more effective use of -N is desired.

On the other hand, paper sludge incineration ash has a similar composition to fly ash, and 30,000 to 40,000 tons are generated annually, but most of it is not used and is dumped, and the place where it is dumped is This has become a problem.

In order to increase the effective use of fly ash as a building material and the effective use of paper slat incineration ash as a building material, the inventors of the present invention have conducted intensive studies and determined that mineral acid has been added to fly ash and paper slat incineration ash. It has been found that by swelling fly ash and paper sludge incineration ash by stirring, and adding and kneading a slurry hardening agent such as cement, a hardened product that is lightweight, fire resistant, and easy to process can be obtained. I found out.

The present invention has been made based on the above findings, and involves preparing a slurry by swelling fly ash and/or paper sludge incineration ash with mineral acid, adding a slurry curing agent to the slurry, and kneading the slurry. The present invention provides a method for producing a fire-resistant, lightweight building material, which comprises molding and curing the mixed material.

The method for producing a fire-resistant lightweight building material of the present invention will be described below in detail based on its embodiments.

When carrying out the present invention, first, fly ash or paper slang incineration ash is stirred and mixed with mineral acid and water in advance, or by stirring and mixed with mineral acid diluted with a predetermined amount of water, swelling treatment is performed. and the slurry concentration is 10-30%
Create a slurry of

As the mineral acid, sulfuric acid or hydrochloric acid can be used, and the amount used is such that the pH of the slurry is adjusted to about 5.8 to 8.0, preferably about 6.8 to 7.2.

When the pH of the slurry is lower than the above range, as will be described later,
When the slurry and the slurry curing agent are kneaded, the pH of the kneaded product becomes 9 or less, and the strength of the hardened product is not sufficiently developed. Since there is too little amount of mineral acid, sufficient treatment with mineral acid is not possible.

In addition, if the treatment time or temperature of the swelling treatment is increased, the bulk specific gravity of the target cured product (building material) will be low. Although the specific gravity becomes high, from the viewpoint of the strength of the cured product, the treatment time is usually about 10 minutes to 24 hours, and the treatment temperature is about room temperature to 80°C.

Next, a slurry curing agent is added to a slurry prepared by swelling fly ash and/or paper sludge incineration ash with a mineral acid and kneaded.

Examples of the slurry curing agent include cement, slaked lime, quicklime, slag, water vitreous, caustic soda, and gypsum.Although they may be used alone, two or more of them are preferably used in combination.

The amount of the slurry curing agent added varies depending on the type of the slurry curing agent, but when two or more types are used together, usually 5 to 40 parts per type are added to 100 parts (parts by weight, same hereinafter) of the slurry. Appropriate. A particularly preferable composition when two or more types are used in combination is, for example, cement 30
±10 parts, 30±10 parts of slag and 10±5 parts of slaked lime.

Furthermore, inorganic fibers or organic fibers can be added and kneaded to the kneaded product of the slurry and the slurry curing agent, thereby further increasing the strength of the fire-resistant lightweight building material that is the object of the present invention.

Examples of the inorganic fiber include asbestos, glass fiber, rock wool fiber, etc., and examples of the organic fiber include pulp, waste paper, nylon, vinylon, etc. The appropriate amount of these fibers added is 20 to 40 parts per 100 parts of the slurry.

In the present invention, when trying to obtain hoards as a molded article, it is preferable to add the above-mentioned inorganic fibers or the above-mentioned organic fibers, and when trying to obtain a block such as a block for a fence as a molded article, Instead of the above-mentioned fibers, sand, gravel, etc. may be mixed.

Further, in the present invention, a metal chloride can be further added and kneaded to the kneaded product, and adding and kneading the metal chloride has the effect of promoting the crystallinity of the calcium silicate hydrated gel.

The above-mentioned metal chlorides include BaCIz, MnC1z
, KCI, etc., and the amount thereof added is 0.1 to 5.0% by weight based on the total solid content of the kneaded product.

Next, as described above, the slurry curing agent and other additives as necessary are added to the slurry, and the kneaded product is shaped into a desired shape such as a board shape, a block shape, etc.
Shape to size.

Examples of this molding method include a method of molding using a paper machine, a filtration press molding machine, or an extrusion molding machine, and a method of molding by pouring into a mold.

Thereafter, the molded product formed by the above-mentioned molding method is cured by natural curing or low-pressure or high-pressure steam curing to obtain a cured product, that is, the fire-resistant lightweight building material according to the present invention.

For the above low pressure or high pressure steam curing, the steam pressure is 1 to 5K.
g/cJ, at a temperature of 60 to 140°C for about 8 to 15 hours.

Regarding the reaction mechanism based on the swelling treatment etc. in the method for producing a fire-resistant lightweight building material of the present invention, for example, when fly ash is subjected to swelling treatment with sulfuric acid, the fly ash is 5i02 in the composition of fly ash is activated, and CaO in the composition of fly ash becomes Ca5O+, and 812
03 becomes 8IZ (SO4), 3, or a part of it becomes AI (OH)3, and a slurry of fly ash is created. When a slurry hardening agent is added to this slurry and kneaded, the reaction progresses further, and calcium Aluminate hydrate, calcium aluminate hydrate, and activated 5
i02 causes calcium 7. It is presumed that lysate I-hydrate is produced and a cured product is formed.

The building material according to the present invention obtained as described above includes:
The hardener can be embossed in a conventional manner. Since the ratio of cement used in the present invention is small, this embossing can be easily performed even after the molded body is cured for several days after molding.

Like a musketeer, the manufacturing method of the present invention uses fly ash and/or paper sludge incineration ash after being swollen with mineral acid.By swelling fly ash with mineral acid, fly ash can be used effectively. Furthermore, by swelling the paper sludge incineration ash with mineral acid, it is now possible to use the paper sludge incineration ash, which was conventionally mostly dumped, as a raw material for building materials. Furthermore, the building material obtained by the manufacturing method of the present invention is lightweight and has excellent fire resistance, and can be easily embossed even after the molded body has been cured for several days. It has a wide range of uses and has great effects.

Examples of the present invention are shown below.

Example 1 500 parts by weight of dilute sulfuric acid to 50 parts by weight of fly ash (
(concentration 1.0%) and stirred for about 1 hour. Adding 16 parts by weight of cement, 14 parts by weight of slag, 4 parts by weight of slaked lime, 12 parts by weight of asbestos and 4 parts by weight of waste paper to the above slurry,
Create an aqueous slurry. Then, using a circular mesh paper making machine,
Obtain the original plate of the chemical cloak, cure it for 2 to 4 weeks, and then 910X
A fire-resistant lightweight construction material (product) of 1820×6H according to the present invention was obtained. The mechanical strength of the above product is bending strength (longitudinal direction) 150Kg/c (horizontal direction) 95Kg/cnl
Met. Moreover, the bulk specific gravity was 0.95.

Example 2 A product was obtained in the same manner as in Example 1, except that 20.5% by weight of BaCl was further added to the slurry at the same time as cement and the like. The mechanical strength of the above product is (
Vertical direction) 170Kg/cn+, (Horizontal direction) 11
It was 0Kg/cA.

Example 3 500 parts by weight of dilute sulfuric acid for 50 parts by weight of paper sludge incineration ash
parts by weight (concentration 1.0%) and stirred for about 1 hour.

1-15 parts by weight of cement, 15 parts by weight of slag, 5 parts by weight of slaked lime, 3 parts by weight of asbestos, and 12 parts by weight of waste paper are added to the above slurry to prepare an aqueous slurry. Thereafter, an original plate of a chemical cloak was obtained using a circular mesh paper making machine, and cured for 2 to 4 weeks to obtain a fire-resistant lightweight building material (product) of 910×182QX5++n according to the present invention. The mechanical strength of the above product is bending strength (longitudinal direction) 160Kg/cTI+, (horizontal direction) 1
05Kg/ctA. Also, the bulk specific gravity is 0.
It was 70.

Example 4 A product was obtained in the same manner as in Example 3 except that 140.5% by weight of BaC was added to the slurry at the same time as adding cement and the like. The mechanical strength of the above product is (
Vertical direction > 175Kg/c (horizontal direction) 115
Kg/cn+.

(How to write procedural amendments) ■, Indication of the case Japanese Patent Application No. 11058/1986 2, Name of the invention Method for manufacturing fire-resistant lightweight building materials 3, Person making the amendment Relationship to the case Patent applicant: Fuji Noncombustible Building Materials Industry Co., Ltd. Yasushi Arai Shigeki Aoki 4, Agent 601 Pacific Nogizaka, 6-29 Akasaka 9-chome, Minato-ku, Tokyo April 26, 1981 (shipped) 6. Application to be amended, entire specification, and commission 7. Contents of the amendment Procedures Amendment document April 12, 1982 1. Indication of the case Patent application No. 11058/1982 2. Name of the invention Method for manufacturing fire-resistant lightweight building materials 3. #Relationship with the case of those who do justice Patent applicant Fuji Noncombustible Building Materials Industry Co., Ltd. Bashifisoku Nogizaka No. 601 ■107 Child 03 (479) 2! >31 Spontaneous amendment (amendment made within 1 year and 3 months from filing of application) 6, Column 7 for detailed explanation of the invention of the specification subject to amendment, Contents of amendment Procedures Amendment letter September 9, 1982 Commissioner of the Patent Office Young Kazuo Sugi 1, Indication of the case, Patent Application No. 11058/1982, Name of the invention, Process for producing fire-resistant lightweight building materials 3, Relationship with the person making the amendment, Patent applicant: Fuji Noncombustible Building Materials Industry Co., Ltd. Arai Yasuo Aoki Shigeki 4, Agent 5, Akasaka 9-6-29, Minato-ku, Tokyo, Date of amendment voluntary amendment (amendment within 1 year and 3 months from application filing date) 6, Specification subject to amendment Detailed Description of the Invention Column 7, Contents of Amendment (1) The following statement was added under the last line of page 10.

"Example 5 70 parts by weight of dilute sulfuric acid (concentration 4.7%) is added to 50 parts by weight of fly ash and stirred for about 1 hour. To the above slurry, 16 parts by weight of cement, 14 parts by weight of slag, 4 parts by weight of slaked lime are added.
parts by weight, 12 parts by weight of asbestos, and 4 parts by weight of waste paper to prepare an aqueous slurry. After that, a raw cloak original plate was obtained using a round net type paper making machine, and cured for 2 to 4 weeks to harden it.
A fire-resistant lightweight building material (product) according to the invention measuring 820x6 m was obtained. The mechanical strength of the above product was approximately the same as that of the product of Example 1. "that's all

Claims (1)

[Claims] fl) A slurry is prepared by swelling fly ash and/or paper slurry and 7-di incineration ash with mineral acid, and a slurry curing agent is added to the slurry and kneaded, followed by kneading. A method for producing a fire-resistant lightweight construction material, which is characterized by molding and curing the product. (2) A fire-resistant lightweight construction according to claim 11, wherein 0.1 to 5.0% by weight of a metal chloride is further added to the kneaded product based on the total solid content of the kneaded product and kneaded. A method for producing the material. (3) A method for producing a fire-resistant lightweight building material according to claim (1), which further comprises adding and kneading inorganic fibers and/or organic fibers to the kneaded material. (4) The above-mentioned method. The method for producing a fire-resistant lightweight building material according to claim 1, wherein the bulk specific gravity of the building material is determined by changing the treatment time and/or temperature of the swelling treatment.