JPH0474738A - Manufacturing method for ceramic building materials - Google Patents

Abstract

PURPOSE:To obtain a ceramic building material resistant to lowering of physical properties and to enable effective utilization of resources by adding sulfuric acid to sludge generated from a production process of a ceramic product and adding the activated sludge to a ceramic product. CONSTITUTION:In the case of producing a ceramic building material by paper- making method, etc., sludge generated from the process is added and mixed with 5-50 kg of an aqueous solution of sulfuric acid (1/5-4N) based on the solid content of the sludge and the activated sludge is mixed to a ceramic product to obtain a ceramic building material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing ceramic building materials, and more particularly to a manufacturing method that utilizes ceramic sludge generated from a production line for ceramic building materials.

[Conventional technology]

Conventionally, when producing ceramic products, especially building materials using the papermaking method, sludge generated in the manufacturing process line has been added to and mixed with raw materials for forming building materials for the purpose of reuse, in order to effectively utilize resources. It is being done.

[Problems with conventional technology]

However, since the above-mentioned sludge has already undergone a hydraulic reaction with cement at room temperature, it is difficult to expect an improvement in strength when mixed with cement. There was a problem that the physical properties of

[Problem to be solved by the invention]

In view of the above-mentioned problems, an object of the present invention is to provide a method for producing ceramic building materials that does not reduce the physical properties of sludge by reducing activation to add reactivity to sludge that has almost no reactivity or properties. This was done as a.

[Technology that led to solving the problem]

That is, in the method for manufacturing ceramic building materials of the present invention, 1 kg of sludge solids is added to the sludge generated from the manufacturing process line of ceramic products.
7'/s ~4N (0gl12 water?8e, 5k
This method is characterized in that the cough activated sludge is mixed into ceramic products and used by adding and mixing 501 ur of sludge, stirring and activating the sludge.

[Effect]

Sludge obtained from the production line of ceramic building materials contains calcium carbonate, calcium hydroxide, calcium silicate-based reactants,
It is a cement hydrate and contains reactants that lead to hardening at room temperature, and is an inert substance. This inert sludge has a specified concentration of g.
When adding acid, CaO5io2 H20 gel + Hz
SOn →CaSO4' 28zO+5i03 CaCO3+Lso4 →Ca5Oa ・2H20+
COz ↑Ca(OH)z +Lso4 =Ca
A reaction of SO4.2HzO occurs, and when the activated Ca5Oa.2[20,5iO7 generated in this process is mixed into a compounded material such as cement, a reaction occurs and the matrix strength increases.

The amount of sulfuric acid to react with the sludge mentioned above is 4N to 175
For one pupil of dried solid sludge, it is appropriate to use 5 to 50 pupil of N concentration. If the activated sludge concentration after the reaction is low, it may be dehydrated, or if the pH needs to be adjusted, the adjusted product is mixed with the raw materials.

1) per 1 kg of dried sludge, sludge cannot be activated if less than 5 kg of N sulfuric acid #1 solution is used, and 50 kg of 4N sulfuric acid solution
If it is more than 1 kg, no improvement in the physical properties of the cured product can be obtained, and if it is more than this, it is meaningless.

The mixing time for mixing sludge and sulfuric acid solution to decompose and activate hydrate gel, carbonate gel, etc. is 3.
~15 minutes is appropriate. If activation is performed and a suitable amount of Ca5O, .2H20 is generated at the same time, the strength of the hardened product will improve up to a dry sludge ratio of 7% by weight with the newly added cement composition.

〔Example〕

This invention will be explained in detail.

FIG. 1 is a block diagram showing the implementation process of the present invention, and FIG. 2 is a graph showing the strength of the plate material obtained according to the embodiment.

After adding 10 kg of 1~'/z N sulfuric acid aqueous solution (containing sludge water) to 1 kg of solid sludge obtained from a ceramic construction material production line by the papermaking method, the sludge was activated by stirring for 10 minutes. Cement 38% by weight, perlite 12
% by weight, 45% by weight of silica sand, and 5% by weight of pulp, 10 to 50% by weight (sludge solid equivalent) was added to the raw material, and the thickness was 12+++a+, the height was 500II, the width was 400
After the plate material No. 1 was manufactured and cured for 2 hours, it was cured in an autoclave under the conditions of 8 kg x 2 hours, and the bending strength after curing was measured. The measurement results are shown in FIG.

In addition, in FIG. 2, a comparative example is shown in which no treatment with sulfuric acid was performed.

〔effect〕

As explained above, in this invention, it is easy to activate the sludge discharged from the manufacturing line of ceramic products, and it is possible to prevent the strength of molded products from decreasing, so that resources can be used effectively.

[Brief explanation of drawings]

Fig. 1 is a process diagram of this invention, and Fig. 2 is a process diagram of this invention.
) 72m 10 2Q! +0 40 50 ShiS ShiC Anzu 11 (Inui*@111pi=t%]

Claims (1)

[Claims] (1) Add 5 kg to 50 kg of 1/5 to 4N sulfuric acid aqueous solution per 1 kg of solid sludge to sludge generated from the manufacturing process line of ceramic products, mix, stir, and activate the activated sludge. A method for manufacturing a ceramic building material, which is characterized in that it is used by mixing it into a product.