JPS5921558A - Manufacture of calcium silicate formed body - 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 for producing an fj lucium silicate molded article and a product.
vinegar.

Molded silicic acid products are widely used in various fields because they are lightweight, have excellent heat insulation properties, have high fire resistance, and have many other characteristics. In addition, various types of halcium silicate crystals are widely used, and representative examples include those of the L-Bel-Grai 1- group and those of the Walas) to Shiite groups. - I can do a lot of things.

Inventor & J Lucium silicate molded body K Q and I from Yohei! 1. We have continued to research, and in this study, we have found that -C1 silicate is prepared by the 15 conventional methods for producing molded bodies from silicic acid raw materials, lime raw materials, and water. I ~ In a method of carrying out a synthesis reaction while heating and stirring the entire slurry to obtain an aqueous slurry of crystals to silicic acid calcinate, and forming and drying the aqueous slurry of crystals of calcinic silicate. -c1] 1 skin and alnini ``) tsu, ka α
It has been found that when a substance is added to the F↑ acidic liquid at a rate of 71..1' of crystals, the room temperature drying shrinkage of the resulting molded product is significantly lowered. In addition, in this study, the solid content of the raw material slurry was determined.

When the specific coexistence of mountain skin increases the bending strength of the resulting calcium silicate molded product, and when the mountain skin is added to the calcium silicate crystal slurry, the bending strength of the molded product and the residual strength rate after firing increase. It was found that the

The present invention has been completed based on new knowledge.

That is, in the present invention, a raw material slurry is prepared by suspending a silicic acid raw material and a lime raw material in water in the coexistence of mountain bark] 7. A hydrothermal synthesis reaction is carried out by stirring, pressing, heating and pressurizing with tW to obtain a b-lucium silicate crystal slurry. Next, a raw material slurry is prepared by suspending the raw material and privet ash raw material in water in the coexistence of mountain bark and in the absence of silicic acid. t, crystals:) su・- and pear, then] 11
The present invention relates to a method for producing a calcium silicate molded body, which is characterized by adding 1υ, Al, and mini-Tsum compounds and molding and drying.

One of the major features of the present invention is that compounds are added to engineered silicic acid 11 lucium crystal 3 +, 1-+ skins and aluminum 3. As a result, the drying shrinkage of the fucorcium silicate molded product obtained at room temperature, particularly in the direction of thickness jj, becomes significantly smaller than L-'.

Another major feature of the present invention is to add mountain bark to the raw material slurry.
T! j Quantification, that is, KO, O1 to 0 in the solid content of the raw material slurry
．． When tightening 4 pieces 3, +t1 mouth of the obtained molded body.
As the y strength increases, the residual strength after firing of the molded product obtained when the husk is added to the halcium silicate crystal slurry increases significantly.

The present invention will be explained below based on its manufacturing method: If,'=i.

First, from silicate source t1, lime raw material and water, mar is t-1
, - + skin is added to the raw material slurry (2).
do. As the silicic acid raw material, crystalline and amorphous silicic acid raw materials can also be used, and those whose main component is crystalline silicic acid can be widely used, such as silica sand,
silica, quartzite, etc., and the latter and 17 r;I: :iF;
Various types of amorphous silicic acid whose main component is quality silicic acid can be used.
Specifically, Ir, Mamagage diatom 11. Examples include white carbon, silica flower, and silicon dust.

Various lime raw materials can be used as the ash raw material.
Specific examples include quicklime, slaked lime, carbide slag, etc. Mountain bark is a hydrated silicate mineral, such as niolite, paris jyite,
Attapal and Toito can be cited as representative examples and L7. It is usually called mountain leather, mountain lux, meerschaum, etc. It can be either Otayamapi Gen-Gen-Usa or a commercially available product.

The shredded mountain bark may contain -partial halcium carbonate, etc., but in such cases, it can be crushed with crushed stone (Q
” When the 1-1 product used in separation 1-25 is too high, the amount of 111 skin added is 0.0% based on the solid content of the raw material slurry.
0I to 0.4 times h1, preferably Id O, 03-0,
31tjf1tchifa2). (7) When the end (LOI city [Yutaka)] is not reached, Pi cannot be obtained, the direction of the bending strength of the body is sufficient, υ; Y, and ゛ is still 0.4 When the weight is greater than 1 inch, the bending strength A of the molded product tends to decrease as well. It is preferably 15 times or more, preferably about 18 to 40 times (L<1), based on the weight of water and solids.

The raw material slurry prepared by hiding is then heated to form a slurry of calcium silicate crystals.
ff! The reaction time depends on its vapor pressure and purpose,
I - silicic acid) J Depending on the type of lucium crystal - (appropriately selected) 1, for example 1-beII/'C') -1'
In the case of l-, it takes 3 hours at 12Kz/r+J for saturated steam, and about 6 hours at 8"' cJ.
No 1 ~ Light's 1 combination" IQ5 Niri/'r- for 2 hours, 121 chestnuts, / Cra for 4 hours 1'X IQ-?
be.

Due to this hydrothermal synthesis reaction, a large number of calcium silicate crystals are entangled to form a large number of approximately spherical secondary particles dispersed in water, and mountain bark is mixed into the secondary particles.

In the present invention, an aqueous slurry in which a large number of secondary particles of calcium silicate crystals are dispersed in water is produced as shown in Figure 1t12.
However, the density of the secondary particles obtained differs depending on the combination of the silicic acid raw material and lime raw material used. For example, when using a crystalline silicic acid raw material, if you use a lime raw material and a special lime milk with a sedimentation volume fiN 5 m1 or more, it is possible to obtain lightweight primary particles of about 0.19/tri. There is an advantage that, as mentioned above, if special milk of lime is not used (1,
It is difficult to obtain particles as large as 1'i', /cJ, but secondary particles with a density higher than this can be obtained. Amorphous 1 again! ■When using silicic acid raw material, use normal limestone 1N and 0. lli', /c-modefc)
- pumice stone: ) Secondary particles were collected;) completed and stopped, each volume of 5 m JL,] - called I:' RL:: Using a special lime milk, 1 ton J" was secretly used.004 IIM can be obtained for extremely light-fitting first-order children, such as ri/cA culm.

The fact that the sedimentation volume is large means that the lime is white and separates into water, and that it is in a stable state, which means that the particles are extremely fine.
Therefore, it means that -C indicates a high nola reaction +<+.The Ji method for producing milk of lime with a sedimentation volume of 5 me or more is itself secondary to QJ and is not particularly limited.

, the sedimentation volume of this milk of lime is based on the raw materials, the ash itself, the firing temperature during lime crushing, the amount of water used to slake the lime with water, the temperature at that time, and the temperature at that time. Stirring line f′1 etc. (te) 1° right, 17I) during quenching 1 ([,]i
``I'm jealous of the conditions that affect me'', ``I'm jealous of the conditions that affect me'',
'E+ is usually σ)r1 in the production method of ash milk;
114j does not come to the limestone milk 1. Then, C sedimentation volume fl (within 5 ml) 71i J to ash milk, for example, υ J, water use lime content (solid content) ratio of 5 times (heavy use) or more, wild cow 5 or high speed at a temperature of 60 ° C or more Wet grind using a wet grinder to disperse the powder. For example, by stirring vigorously as in Milk of lime can be obtained.The stirring speed and strength can generally be reduced by increasing the temperature and stirring time during stirring.For example, even if milk of lime has been slaked at 20°C, if it is left for a long time. The desired milk of lime can be obtained by stirring with a ho-7mi-ju 41-.In addition, various kinds of agitators are used, and those with or without baffle plates can be used. I can do it.

In the process of the present invention, the silicic acid thus obtained)]
Crystal slurry 1 (Add aluminum compound. In the aluminum compound binder used at this time, a compound that reacts with calcium silicate crystals to produce a water-insoluble or sparingly soluble fucorcium salt can be used. For example, to sulfuric acid 711 No. 20 ( (including anhydrous salts and hydrated salts), ricylic acid Al'F,
: Δ, aluminum hydrogen sulfate, etc. can be exemplified. Koi
Solid content in crystal slurry and aluminum r″i /, 1 to 15 weight compounds on anhydride basis during compound cutting and weight loss, < tj: I to 1
Add approximately 0% by weight M%. At this time, if the amount of P-luminium compound added does not reach 1%, the expected effect is expected to be 1.
．． 4!1G <、If it is more than 15 weight M, the drying shrinkage tends to become worse.

′! ) In the present invention, it is also possible to add mountain bark to the calcium silicate crystal slurry. By this addition, the residue after firing of the formed LE body (1 strong 1 Hayabusa)
It is possible to set a limit of 7. At this time, the total weight of the solid content in the crystals and the husk is KO, 4 to 15 weights, and the culm degree is 11.

At this time, I reached the person in charge of (), quadruple duty) and shouted
l: The effect is not sufficiently exhibited, and even if the amount is more than 15% i4%, the effect of I- is not only achieved in the i+ period, but also the drying shrinkage of the molded product increases as h-II increases. It is undesirable as it tends to cause a scorching effect.In this way, if you add the lint to the water slurry of the calcium silicate crystals, the lint will be present in the secondary particles of the nocolsium silicate crystals. First, it is uniformly dispersed in water without coming into contact with the particles [7].

In the present invention, the calcium silicate molded article can contain ordinary additives, and in this case, any of the additives that have been conventionally used can be used, such as fibrous materials, Clays, Se:I:,,i l-1''
[Koitarushiriha, Aluminum Grip Il/ etc. can be given as examples,
In more detail, fibrous materials include asbestos, rock wool, 15 lath fibers, ceramic fibers, carbon fibers, inorganic fibers such as metal fibers, various synthetic fibers such as boriatrido and polygostel, and various natural fibers such as Palzu and Xelulose. Examples include organic fibers such as clays, and clays, such as kaorishi and henna.

(+-, parf O-fee 5yt, etc., as cement, gepoldora υ docemez nod, P 11/
,'shit'4. Examples include N1-1 Sekisei and the like. As a means for containing these additives, there is a means for adding an additive 1 to the raw material slurry (hereinafter referred to as a pre-adding means).
and a means for adding 1 J to the old l-+ lucium crystal slurry (referred to as a post-adding means).In the case of the pre-adding means, inorganic fibers are usually used, and 11 post-adding means σ) pigeon i
u y= <Various additives can be used.

The present invention will be specifically explained with reference to examples and comparative examples. No need to worry:
Wow! +, -fr-rJ, heavy 11 (indicates H).

Real MH1 ((II 1 raw i 1 ash ((7゛σ(λQ5.0chi)) 41.42 parts to 8
It is slaked in 497 parts of 0x゛ warm water (also lime milk?
'1-falling volume kj-1.5ra7'- and r hot. 1
- Add lime milk to f-1,0518 go 1 ((0, (1592
Disperse Sepiolai 1~ (produced in China) of 2000-11 times the total amount of water for 2 minutes at a mixer to make 474Nk.

"Sri" and "SV" have an average particle diameter of 025 μm.
Sis Paddle 1 (810291,5%) 46.08 parts to 20
Add the slurry obtained by dispersing the slurry for 2 minutes with twice the weight of water using an Iji E E + J-, add water to 4-1 times the weight, and mix so that the total amount of water is 24 times the weight of the solid content. Got slurry. Next, these are saturated water vapor pressure l5Ks+/c
a. Rotation speed 40 in an autoclay at a temperature of 200.4℃
A hydrothermal synthesis reaction was carried out for 2 hours while r, p, mf stirring blades were rotated at full rotation to obtain a crystal slurry. These crystal slurries
- was dried at 100℃ for 24 hours and subjected to X-ray diffraction phase separation, and it was confirmed that it was a non-dry 1-crystal.
'/1. .

Next, to the above crystal slurry, I7 based on the solid content in the slurry, 7 parts of j3 lath fiber #, 15 parts of pal as additives, 3 parts of pol l~rashid cement, and hydrated Pluminium sulfate (At2(5OZl)3) were added to the crystal slurry.・l 81120,,
) were added in the proportions shown in Table 1 below on an anhydride basis, molded in one batch, and dried at 1.120°C for 20 hours to obtain a molded product. The physical properties of the obtained molded article were as shown in Table 1 above.

Table 1 The residual strength rate was determined by the following formula.

Example 41.42 parts of quicklime (CaO95.0%) at 80℃
The sedimentation volume of the 5 ash milk fIf k14.4 ml was 14.4 ml. Add the slurry obtained by dispersing 4608 parts of (St O291.5%) in 20 parts of water for 2 minutes in an extractor, and then add water to adjust the total water content to the solid content. 24
A raw material slurry was obtained by mixing to double the weight (7).Then, this was heated to a saturated water vapor pressure of 15/cJ and a temperature of 200.
At 4°C - 1 - Number of revolutions in clay 4 Q r, p, m
A hydrothermal synthesis reaction was carried out for 2 hours while rotating the stirring blade.
A slurry consisting of linotrite crystals was obtained.

Next, to the above crystal slurry, 1 to 7 parts of J3 lath fiber, 55 parts of Balu, 3 parts of Portland Cemecite, and aluminum sulfate hydrate (At2 (So, ), :, J・18H20) was obtained on an anhydride basis by dispersing a specified amount of t-hyolite (produced in China, containing -. part of calcium carbonate) in 100 times its weight of water at +4j- for 2 minutes. Add the slurry at the ratio [)c shown in Table 2, and form it into a zuress, 120
A molded article was obtained by drying at ℃ for 20 hours.

The physical properties of the molded article were as shown in TF Table 2.

Table 2 Provided that A I , A, l l and Ai I 2 il
l Comparison Ino 11 is shown. 1゜ Sulfuric acid a11 is added for water content &; i: I 0% aqueous solution is added υ++L.

Example 3 45.83 parts of tp lime ((,'a095.4%) was slaked in 550 parts of warm water at 80°C, and heated in a thermometer at 3°C.
The sedimentation volume of milk of lime obtained by dispersing in water for 18.5 minutes is
m/'. -) Add 49.63 parts of silica powder (St 0294.06%) with an average particle size of 9 μm to the milk of lime in step 1, and then add water to mix so that the total water loss is 22 times the solid content. A raw material slurry was obtained. Next, this was subjected to a hydrothermal synthesis reaction for 2 hours while rotating the stirring blade at a rotation speed of 41 r and a pg of 9 m in an autoclave at a saturated water vapor pressure of 15 Kq/CJ, a temperature of 200, and a temperature of 4°C. A slurry was obtained.

Next, to the above crystal slurry, based on the solid content in the slurry, as additives, 7 parts of jJ shirasu fiber, 15 parts of Pal, Pol 1-Landseme, J + - 3 parts, and various aluminum compounds are added on an anhydride basis and at a predetermined Ji. No se L this one lie l-'
(Made by substitute medicine, product name, ■・- Doworas Af L -
1001) ) was dispersed in 29 parts with +00 weight Nt times water at a temperature of 2-41- to add 35% at the ratio shown in Table 3, and form the mixture into a zuresu form. 2 (Dried at 1° C. for 20 hours to obtain a molded product (!J; #.Y!).The physical properties of the molded product were as shown in Table 3 below.

／″ 、、／' ／・″ ／ ／' S? In steps 2 to 7, the aluminum compound was added in the form of 10 g of aqueous solution or 1 g of renal suspension.

Example 4 The solid content in the slurry was added to the synthetic I-F-no-1-lite crystal slurry in the same manner as in Example 3 except that milk of lime with a sedimentation volume of 41.3 ml was used. As a standard,
Addition i (, = 15 russian i edition 17 parts, Baluzu 5 parts, Bortland Semesi 1-3 parts and aluminum sulfate water content (・t〕2 (S01+) 3・l81120) was added to the anhydride fu 1 ( Quasi-ζ゛ and 2 parts of 1τ olide (produced in China) ', f, l 00 times the weight of water to mix ±43-
) 7 for 2 minutes, the slurry was enriched and enriched at the ratio shown in Table 4, and '51 Nos. molding (~, 120
Dry for 20 hours 11. The molded body is 1().

Toku t-) J) Dase J
Tuesday &) 1i (It was iri.

Table 4 stomach! ', Lyf61 is Comparative Example 6-in.

In addition, in A2-4, add 10% hydrated salt to aluminum sulfate.
It was added as an aqueous solution.

(hereafter 10)

Claims (1)

[Claims] (1) A raw material slurry is prepared by suspending the silicic acid raw material J and limestone 1 in water in the coexistence of mountain bark. A method for producing a halcium silicate molded article, which is characterized by obtaining a slurry, then adding an aluminum r''tum compound thereto, and molding and drying it. 17 to prepare a raw material slurry, heat and pressurize under pressure to carry out a hydrothermal synthesis reaction to form a calcium silicate crystal slurry, then add mountain bark and an aluminum compound and form and dry. 1. A method for producing a calcium silicate molded body.